6478 lines
173 KiB
C
6478 lines
173 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2008 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/list_sort.h>
|
|
#include <linux/iversion.h>
|
|
#include "misc.h"
|
|
#include "ctree.h"
|
|
#include "tree-log.h"
|
|
#include "disk-io.h"
|
|
#include "locking.h"
|
|
#include "print-tree.h"
|
|
#include "backref.h"
|
|
#include "compression.h"
|
|
#include "qgroup.h"
|
|
#include "block-group.h"
|
|
#include "space-info.h"
|
|
|
|
/* magic values for the inode_only field in btrfs_log_inode:
|
|
*
|
|
* LOG_INODE_ALL means to log everything
|
|
* LOG_INODE_EXISTS means to log just enough to recreate the inode
|
|
* during log replay
|
|
*/
|
|
enum {
|
|
LOG_INODE_ALL,
|
|
LOG_INODE_EXISTS,
|
|
LOG_OTHER_INODE,
|
|
LOG_OTHER_INODE_ALL,
|
|
};
|
|
|
|
/*
|
|
* directory trouble cases
|
|
*
|
|
* 1) on rename or unlink, if the inode being unlinked isn't in the fsync
|
|
* log, we must force a full commit before doing an fsync of the directory
|
|
* where the unlink was done.
|
|
* ---> record transid of last unlink/rename per directory
|
|
*
|
|
* mkdir foo/some_dir
|
|
* normal commit
|
|
* rename foo/some_dir foo2/some_dir
|
|
* mkdir foo/some_dir
|
|
* fsync foo/some_dir/some_file
|
|
*
|
|
* The fsync above will unlink the original some_dir without recording
|
|
* it in its new location (foo2). After a crash, some_dir will be gone
|
|
* unless the fsync of some_file forces a full commit
|
|
*
|
|
* 2) we must log any new names for any file or dir that is in the fsync
|
|
* log. ---> check inode while renaming/linking.
|
|
*
|
|
* 2a) we must log any new names for any file or dir during rename
|
|
* when the directory they are being removed from was logged.
|
|
* ---> check inode and old parent dir during rename
|
|
*
|
|
* 2a is actually the more important variant. With the extra logging
|
|
* a crash might unlink the old name without recreating the new one
|
|
*
|
|
* 3) after a crash, we must go through any directories with a link count
|
|
* of zero and redo the rm -rf
|
|
*
|
|
* mkdir f1/foo
|
|
* normal commit
|
|
* rm -rf f1/foo
|
|
* fsync(f1)
|
|
*
|
|
* The directory f1 was fully removed from the FS, but fsync was never
|
|
* called on f1, only its parent dir. After a crash the rm -rf must
|
|
* be replayed. This must be able to recurse down the entire
|
|
* directory tree. The inode link count fixup code takes care of the
|
|
* ugly details.
|
|
*/
|
|
|
|
/*
|
|
* stages for the tree walking. The first
|
|
* stage (0) is to only pin down the blocks we find
|
|
* the second stage (1) is to make sure that all the inodes
|
|
* we find in the log are created in the subvolume.
|
|
*
|
|
* The last stage is to deal with directories and links and extents
|
|
* and all the other fun semantics
|
|
*/
|
|
enum {
|
|
LOG_WALK_PIN_ONLY,
|
|
LOG_WALK_REPLAY_INODES,
|
|
LOG_WALK_REPLAY_DIR_INDEX,
|
|
LOG_WALK_REPLAY_ALL,
|
|
};
|
|
|
|
static int btrfs_log_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_inode *inode,
|
|
int inode_only,
|
|
struct btrfs_log_ctx *ctx);
|
|
static int link_to_fixup_dir(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, u64 objectid);
|
|
static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
u64 dirid, int del_all);
|
|
|
|
/*
|
|
* tree logging is a special write ahead log used to make sure that
|
|
* fsyncs and O_SYNCs can happen without doing full tree commits.
|
|
*
|
|
* Full tree commits are expensive because they require commonly
|
|
* modified blocks to be recowed, creating many dirty pages in the
|
|
* extent tree an 4x-6x higher write load than ext3.
|
|
*
|
|
* Instead of doing a tree commit on every fsync, we use the
|
|
* key ranges and transaction ids to find items for a given file or directory
|
|
* that have changed in this transaction. Those items are copied into
|
|
* a special tree (one per subvolume root), that tree is written to disk
|
|
* and then the fsync is considered complete.
|
|
*
|
|
* After a crash, items are copied out of the log-tree back into the
|
|
* subvolume tree. Any file data extents found are recorded in the extent
|
|
* allocation tree, and the log-tree freed.
|
|
*
|
|
* The log tree is read three times, once to pin down all the extents it is
|
|
* using in ram and once, once to create all the inodes logged in the tree
|
|
* and once to do all the other items.
|
|
*/
|
|
|
|
/*
|
|
* start a sub transaction and setup the log tree
|
|
* this increments the log tree writer count to make the people
|
|
* syncing the tree wait for us to finish
|
|
*/
|
|
static int start_log_trans(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* First check if the log root tree was already created. If not, create
|
|
* it before locking the root's log_mutex, just to keep lockdep happy.
|
|
*/
|
|
if (!test_bit(BTRFS_ROOT_HAS_LOG_TREE, &tree_root->state)) {
|
|
mutex_lock(&tree_root->log_mutex);
|
|
if (!fs_info->log_root_tree) {
|
|
ret = btrfs_init_log_root_tree(trans, fs_info);
|
|
if (!ret)
|
|
set_bit(BTRFS_ROOT_HAS_LOG_TREE, &tree_root->state);
|
|
}
|
|
mutex_unlock(&tree_root->log_mutex);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
mutex_lock(&root->log_mutex);
|
|
|
|
if (root->log_root) {
|
|
if (btrfs_need_log_full_commit(trans)) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
if (!root->log_start_pid) {
|
|
clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state);
|
|
root->log_start_pid = current->pid;
|
|
} else if (root->log_start_pid != current->pid) {
|
|
set_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state);
|
|
}
|
|
} else {
|
|
ret = btrfs_add_log_tree(trans, root);
|
|
if (ret)
|
|
goto out;
|
|
|
|
set_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state);
|
|
clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state);
|
|
root->log_start_pid = current->pid;
|
|
}
|
|
|
|
atomic_inc(&root->log_writers);
|
|
if (ctx && !ctx->logging_new_name) {
|
|
int index = root->log_transid % 2;
|
|
list_add_tail(&ctx->list, &root->log_ctxs[index]);
|
|
ctx->log_transid = root->log_transid;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&root->log_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* returns 0 if there was a log transaction running and we were able
|
|
* to join, or returns -ENOENT if there were not transactions
|
|
* in progress
|
|
*/
|
|
static int join_running_log_trans(struct btrfs_root *root)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
if (!test_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state))
|
|
return ret;
|
|
|
|
mutex_lock(&root->log_mutex);
|
|
if (root->log_root) {
|
|
ret = 0;
|
|
atomic_inc(&root->log_writers);
|
|
}
|
|
mutex_unlock(&root->log_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This either makes the current running log transaction wait
|
|
* until you call btrfs_end_log_trans() or it makes any future
|
|
* log transactions wait until you call btrfs_end_log_trans()
|
|
*/
|
|
void btrfs_pin_log_trans(struct btrfs_root *root)
|
|
{
|
|
atomic_inc(&root->log_writers);
|
|
}
|
|
|
|
/*
|
|
* indicate we're done making changes to the log tree
|
|
* and wake up anyone waiting to do a sync
|
|
*/
|
|
void btrfs_end_log_trans(struct btrfs_root *root)
|
|
{
|
|
if (atomic_dec_and_test(&root->log_writers)) {
|
|
/* atomic_dec_and_test implies a barrier */
|
|
cond_wake_up_nomb(&root->log_writer_wait);
|
|
}
|
|
}
|
|
|
|
static int btrfs_write_tree_block(struct extent_buffer *buf)
|
|
{
|
|
return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
|
|
buf->start + buf->len - 1);
|
|
}
|
|
|
|
static void btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
|
|
{
|
|
filemap_fdatawait_range(buf->pages[0]->mapping,
|
|
buf->start, buf->start + buf->len - 1);
|
|
}
|
|
|
|
/*
|
|
* the walk control struct is used to pass state down the chain when
|
|
* processing the log tree. The stage field tells us which part
|
|
* of the log tree processing we are currently doing. The others
|
|
* are state fields used for that specific part
|
|
*/
|
|
struct walk_control {
|
|
/* should we free the extent on disk when done? This is used
|
|
* at transaction commit time while freeing a log tree
|
|
*/
|
|
int free;
|
|
|
|
/* should we write out the extent buffer? This is used
|
|
* while flushing the log tree to disk during a sync
|
|
*/
|
|
int write;
|
|
|
|
/* should we wait for the extent buffer io to finish? Also used
|
|
* while flushing the log tree to disk for a sync
|
|
*/
|
|
int wait;
|
|
|
|
/* pin only walk, we record which extents on disk belong to the
|
|
* log trees
|
|
*/
|
|
int pin;
|
|
|
|
/* what stage of the replay code we're currently in */
|
|
int stage;
|
|
|
|
/*
|
|
* Ignore any items from the inode currently being processed. Needs
|
|
* to be set every time we find a BTRFS_INODE_ITEM_KEY and we are in
|
|
* the LOG_WALK_REPLAY_INODES stage.
|
|
*/
|
|
bool ignore_cur_inode;
|
|
|
|
/* the root we are currently replaying */
|
|
struct btrfs_root *replay_dest;
|
|
|
|
/* the trans handle for the current replay */
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
/* the function that gets used to process blocks we find in the
|
|
* tree. Note the extent_buffer might not be up to date when it is
|
|
* passed in, and it must be checked or read if you need the data
|
|
* inside it
|
|
*/
|
|
int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb,
|
|
struct walk_control *wc, u64 gen, int level);
|
|
};
|
|
|
|
/*
|
|
* process_func used to pin down extents, write them or wait on them
|
|
*/
|
|
static int process_one_buffer(struct btrfs_root *log,
|
|
struct extent_buffer *eb,
|
|
struct walk_control *wc, u64 gen, int level)
|
|
{
|
|
struct btrfs_fs_info *fs_info = log->fs_info;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* If this fs is mixed then we need to be able to process the leaves to
|
|
* pin down any logged extents, so we have to read the block.
|
|
*/
|
|
if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
|
|
ret = btrfs_read_buffer(eb, gen, level, NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (wc->pin)
|
|
ret = btrfs_pin_extent_for_log_replay(wc->trans, eb->start,
|
|
eb->len);
|
|
|
|
if (!ret && btrfs_buffer_uptodate(eb, gen, 0)) {
|
|
if (wc->pin && btrfs_header_level(eb) == 0)
|
|
ret = btrfs_exclude_logged_extents(eb);
|
|
if (wc->write)
|
|
btrfs_write_tree_block(eb);
|
|
if (wc->wait)
|
|
btrfs_wait_tree_block_writeback(eb);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Item overwrite used by replay and tree logging. eb, slot and key all refer
|
|
* to the src data we are copying out.
|
|
*
|
|
* root is the tree we are copying into, and path is a scratch
|
|
* path for use in this function (it should be released on entry and
|
|
* will be released on exit).
|
|
*
|
|
* If the key is already in the destination tree the existing item is
|
|
* overwritten. If the existing item isn't big enough, it is extended.
|
|
* If it is too large, it is truncated.
|
|
*
|
|
* If the key isn't in the destination yet, a new item is inserted.
|
|
*/
|
|
static noinline int overwrite_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct extent_buffer *eb, int slot,
|
|
struct btrfs_key *key)
|
|
{
|
|
int ret;
|
|
u32 item_size;
|
|
u64 saved_i_size = 0;
|
|
int save_old_i_size = 0;
|
|
unsigned long src_ptr;
|
|
unsigned long dst_ptr;
|
|
int overwrite_root = 0;
|
|
bool inode_item = key->type == BTRFS_INODE_ITEM_KEY;
|
|
|
|
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID)
|
|
overwrite_root = 1;
|
|
|
|
item_size = btrfs_item_size_nr(eb, slot);
|
|
src_ptr = btrfs_item_ptr_offset(eb, slot);
|
|
|
|
/* look for the key in the destination tree */
|
|
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (ret == 0) {
|
|
char *src_copy;
|
|
char *dst_copy;
|
|
u32 dst_size = btrfs_item_size_nr(path->nodes[0],
|
|
path->slots[0]);
|
|
if (dst_size != item_size)
|
|
goto insert;
|
|
|
|
if (item_size == 0) {
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
dst_copy = kmalloc(item_size, GFP_NOFS);
|
|
src_copy = kmalloc(item_size, GFP_NOFS);
|
|
if (!dst_copy || !src_copy) {
|
|
btrfs_release_path(path);
|
|
kfree(dst_copy);
|
|
kfree(src_copy);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
read_extent_buffer(eb, src_copy, src_ptr, item_size);
|
|
|
|
dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]);
|
|
read_extent_buffer(path->nodes[0], dst_copy, dst_ptr,
|
|
item_size);
|
|
ret = memcmp(dst_copy, src_copy, item_size);
|
|
|
|
kfree(dst_copy);
|
|
kfree(src_copy);
|
|
/*
|
|
* they have the same contents, just return, this saves
|
|
* us from cowing blocks in the destination tree and doing
|
|
* extra writes that may not have been done by a previous
|
|
* sync
|
|
*/
|
|
if (ret == 0) {
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We need to load the old nbytes into the inode so when we
|
|
* replay the extents we've logged we get the right nbytes.
|
|
*/
|
|
if (inode_item) {
|
|
struct btrfs_inode_item *item;
|
|
u64 nbytes;
|
|
u32 mode;
|
|
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
nbytes = btrfs_inode_nbytes(path->nodes[0], item);
|
|
item = btrfs_item_ptr(eb, slot,
|
|
struct btrfs_inode_item);
|
|
btrfs_set_inode_nbytes(eb, item, nbytes);
|
|
|
|
/*
|
|
* If this is a directory we need to reset the i_size to
|
|
* 0 so that we can set it up properly when replaying
|
|
* the rest of the items in this log.
|
|
*/
|
|
mode = btrfs_inode_mode(eb, item);
|
|
if (S_ISDIR(mode))
|
|
btrfs_set_inode_size(eb, item, 0);
|
|
}
|
|
} else if (inode_item) {
|
|
struct btrfs_inode_item *item;
|
|
u32 mode;
|
|
|
|
/*
|
|
* New inode, set nbytes to 0 so that the nbytes comes out
|
|
* properly when we replay the extents.
|
|
*/
|
|
item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item);
|
|
btrfs_set_inode_nbytes(eb, item, 0);
|
|
|
|
/*
|
|
* If this is a directory we need to reset the i_size to 0 so
|
|
* that we can set it up properly when replaying the rest of
|
|
* the items in this log.
|
|
*/
|
|
mode = btrfs_inode_mode(eb, item);
|
|
if (S_ISDIR(mode))
|
|
btrfs_set_inode_size(eb, item, 0);
|
|
}
|
|
insert:
|
|
btrfs_release_path(path);
|
|
/* try to insert the key into the destination tree */
|
|
path->skip_release_on_error = 1;
|
|
ret = btrfs_insert_empty_item(trans, root, path,
|
|
key, item_size);
|
|
path->skip_release_on_error = 0;
|
|
|
|
/* make sure any existing item is the correct size */
|
|
if (ret == -EEXIST || ret == -EOVERFLOW) {
|
|
u32 found_size;
|
|
found_size = btrfs_item_size_nr(path->nodes[0],
|
|
path->slots[0]);
|
|
if (found_size > item_size)
|
|
btrfs_truncate_item(path, item_size, 1);
|
|
else if (found_size < item_size)
|
|
btrfs_extend_item(path, item_size - found_size);
|
|
} else if (ret) {
|
|
return ret;
|
|
}
|
|
dst_ptr = btrfs_item_ptr_offset(path->nodes[0],
|
|
path->slots[0]);
|
|
|
|
/* don't overwrite an existing inode if the generation number
|
|
* was logged as zero. This is done when the tree logging code
|
|
* is just logging an inode to make sure it exists after recovery.
|
|
*
|
|
* Also, don't overwrite i_size on directories during replay.
|
|
* log replay inserts and removes directory items based on the
|
|
* state of the tree found in the subvolume, and i_size is modified
|
|
* as it goes
|
|
*/
|
|
if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) {
|
|
struct btrfs_inode_item *src_item;
|
|
struct btrfs_inode_item *dst_item;
|
|
|
|
src_item = (struct btrfs_inode_item *)src_ptr;
|
|
dst_item = (struct btrfs_inode_item *)dst_ptr;
|
|
|
|
if (btrfs_inode_generation(eb, src_item) == 0) {
|
|
struct extent_buffer *dst_eb = path->nodes[0];
|
|
const u64 ino_size = btrfs_inode_size(eb, src_item);
|
|
|
|
/*
|
|
* For regular files an ino_size == 0 is used only when
|
|
* logging that an inode exists, as part of a directory
|
|
* fsync, and the inode wasn't fsynced before. In this
|
|
* case don't set the size of the inode in the fs/subvol
|
|
* tree, otherwise we would be throwing valid data away.
|
|
*/
|
|
if (S_ISREG(btrfs_inode_mode(eb, src_item)) &&
|
|
S_ISREG(btrfs_inode_mode(dst_eb, dst_item)) &&
|
|
ino_size != 0)
|
|
btrfs_set_inode_size(dst_eb, dst_item, ino_size);
|
|
goto no_copy;
|
|
}
|
|
|
|
if (overwrite_root &&
|
|
S_ISDIR(btrfs_inode_mode(eb, src_item)) &&
|
|
S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) {
|
|
save_old_i_size = 1;
|
|
saved_i_size = btrfs_inode_size(path->nodes[0],
|
|
dst_item);
|
|
}
|
|
}
|
|
|
|
copy_extent_buffer(path->nodes[0], eb, dst_ptr,
|
|
src_ptr, item_size);
|
|
|
|
if (save_old_i_size) {
|
|
struct btrfs_inode_item *dst_item;
|
|
dst_item = (struct btrfs_inode_item *)dst_ptr;
|
|
btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size);
|
|
}
|
|
|
|
/* make sure the generation is filled in */
|
|
if (key->type == BTRFS_INODE_ITEM_KEY) {
|
|
struct btrfs_inode_item *dst_item;
|
|
dst_item = (struct btrfs_inode_item *)dst_ptr;
|
|
if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) {
|
|
btrfs_set_inode_generation(path->nodes[0], dst_item,
|
|
trans->transid);
|
|
}
|
|
}
|
|
no_copy:
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* simple helper to read an inode off the disk from a given root
|
|
* This can only be called for subvolume roots and not for the log
|
|
*/
|
|
static noinline struct inode *read_one_inode(struct btrfs_root *root,
|
|
u64 objectid)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = btrfs_iget(root->fs_info->sb, objectid, root);
|
|
if (IS_ERR(inode))
|
|
inode = NULL;
|
|
return inode;
|
|
}
|
|
|
|
/* replays a single extent in 'eb' at 'slot' with 'key' into the
|
|
* subvolume 'root'. path is released on entry and should be released
|
|
* on exit.
|
|
*
|
|
* extents in the log tree have not been allocated out of the extent
|
|
* tree yet. So, this completes the allocation, taking a reference
|
|
* as required if the extent already exists or creating a new extent
|
|
* if it isn't in the extent allocation tree yet.
|
|
*
|
|
* The extent is inserted into the file, dropping any existing extents
|
|
* from the file that overlap the new one.
|
|
*/
|
|
static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct extent_buffer *eb, int slot,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_drop_extents_args drop_args = { 0 };
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int found_type;
|
|
u64 extent_end;
|
|
u64 start = key->offset;
|
|
u64 nbytes = 0;
|
|
struct btrfs_file_extent_item *item;
|
|
struct inode *inode = NULL;
|
|
unsigned long size;
|
|
int ret = 0;
|
|
|
|
item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item);
|
|
found_type = btrfs_file_extent_type(eb, item);
|
|
|
|
if (found_type == BTRFS_FILE_EXTENT_REG ||
|
|
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
nbytes = btrfs_file_extent_num_bytes(eb, item);
|
|
extent_end = start + nbytes;
|
|
|
|
/*
|
|
* We don't add to the inodes nbytes if we are prealloc or a
|
|
* hole.
|
|
*/
|
|
if (btrfs_file_extent_disk_bytenr(eb, item) == 0)
|
|
nbytes = 0;
|
|
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
size = btrfs_file_extent_ram_bytes(eb, item);
|
|
nbytes = btrfs_file_extent_ram_bytes(eb, item);
|
|
extent_end = ALIGN(start + size,
|
|
fs_info->sectorsize);
|
|
} else {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
inode = read_one_inode(root, key->objectid);
|
|
if (!inode) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* first check to see if we already have this extent in the
|
|
* file. This must be done before the btrfs_drop_extents run
|
|
* so we don't try to drop this extent.
|
|
*/
|
|
ret = btrfs_lookup_file_extent(trans, root, path,
|
|
btrfs_ino(BTRFS_I(inode)), start, 0);
|
|
|
|
if (ret == 0 &&
|
|
(found_type == BTRFS_FILE_EXTENT_REG ||
|
|
found_type == BTRFS_FILE_EXTENT_PREALLOC)) {
|
|
struct btrfs_file_extent_item cmp1;
|
|
struct btrfs_file_extent_item cmp2;
|
|
struct btrfs_file_extent_item *existing;
|
|
struct extent_buffer *leaf;
|
|
|
|
leaf = path->nodes[0];
|
|
existing = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
|
|
read_extent_buffer(eb, &cmp1, (unsigned long)item,
|
|
sizeof(cmp1));
|
|
read_extent_buffer(leaf, &cmp2, (unsigned long)existing,
|
|
sizeof(cmp2));
|
|
|
|
/*
|
|
* we already have a pointer to this exact extent,
|
|
* we don't have to do anything
|
|
*/
|
|
if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) {
|
|
btrfs_release_path(path);
|
|
goto out;
|
|
}
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/* drop any overlapping extents */
|
|
drop_args.start = start;
|
|
drop_args.end = extent_end;
|
|
drop_args.drop_cache = true;
|
|
ret = btrfs_drop_extents(trans, root, BTRFS_I(inode), &drop_args);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (found_type == BTRFS_FILE_EXTENT_REG ||
|
|
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
|
|
u64 offset;
|
|
unsigned long dest_offset;
|
|
struct btrfs_key ins;
|
|
|
|
if (btrfs_file_extent_disk_bytenr(eb, item) == 0 &&
|
|
btrfs_fs_incompat(fs_info, NO_HOLES))
|
|
goto update_inode;
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, key,
|
|
sizeof(*item));
|
|
if (ret)
|
|
goto out;
|
|
dest_offset = btrfs_item_ptr_offset(path->nodes[0],
|
|
path->slots[0]);
|
|
copy_extent_buffer(path->nodes[0], eb, dest_offset,
|
|
(unsigned long)item, sizeof(*item));
|
|
|
|
ins.objectid = btrfs_file_extent_disk_bytenr(eb, item);
|
|
ins.offset = btrfs_file_extent_disk_num_bytes(eb, item);
|
|
ins.type = BTRFS_EXTENT_ITEM_KEY;
|
|
offset = key->offset - btrfs_file_extent_offset(eb, item);
|
|
|
|
/*
|
|
* Manually record dirty extent, as here we did a shallow
|
|
* file extent item copy and skip normal backref update,
|
|
* but modifying extent tree all by ourselves.
|
|
* So need to manually record dirty extent for qgroup,
|
|
* as the owner of the file extent changed from log tree
|
|
* (doesn't affect qgroup) to fs/file tree(affects qgroup)
|
|
*/
|
|
ret = btrfs_qgroup_trace_extent(trans,
|
|
btrfs_file_extent_disk_bytenr(eb, item),
|
|
btrfs_file_extent_disk_num_bytes(eb, item),
|
|
GFP_NOFS);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ins.objectid > 0) {
|
|
struct btrfs_ref ref = { 0 };
|
|
u64 csum_start;
|
|
u64 csum_end;
|
|
LIST_HEAD(ordered_sums);
|
|
|
|
/*
|
|
* is this extent already allocated in the extent
|
|
* allocation tree? If so, just add a reference
|
|
*/
|
|
ret = btrfs_lookup_data_extent(fs_info, ins.objectid,
|
|
ins.offset);
|
|
if (ret == 0) {
|
|
btrfs_init_generic_ref(&ref,
|
|
BTRFS_ADD_DELAYED_REF,
|
|
ins.objectid, ins.offset, 0);
|
|
btrfs_init_data_ref(&ref,
|
|
root->root_key.objectid,
|
|
key->objectid, offset);
|
|
ret = btrfs_inc_extent_ref(trans, &ref);
|
|
if (ret)
|
|
goto out;
|
|
} else {
|
|
/*
|
|
* insert the extent pointer in the extent
|
|
* allocation tree
|
|
*/
|
|
ret = btrfs_alloc_logged_file_extent(trans,
|
|
root->root_key.objectid,
|
|
key->objectid, offset, &ins);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (btrfs_file_extent_compression(eb, item)) {
|
|
csum_start = ins.objectid;
|
|
csum_end = csum_start + ins.offset;
|
|
} else {
|
|
csum_start = ins.objectid +
|
|
btrfs_file_extent_offset(eb, item);
|
|
csum_end = csum_start +
|
|
btrfs_file_extent_num_bytes(eb, item);
|
|
}
|
|
|
|
ret = btrfs_lookup_csums_range(root->log_root,
|
|
csum_start, csum_end - 1,
|
|
&ordered_sums, 0);
|
|
if (ret)
|
|
goto out;
|
|
/*
|
|
* Now delete all existing cums in the csum root that
|
|
* cover our range. We do this because we can have an
|
|
* extent that is completely referenced by one file
|
|
* extent item and partially referenced by another
|
|
* file extent item (like after using the clone or
|
|
* extent_same ioctls). In this case if we end up doing
|
|
* the replay of the one that partially references the
|
|
* extent first, and we do not do the csum deletion
|
|
* below, we can get 2 csum items in the csum tree that
|
|
* overlap each other. For example, imagine our log has
|
|
* the two following file extent items:
|
|
*
|
|
* key (257 EXTENT_DATA 409600)
|
|
* extent data disk byte 12845056 nr 102400
|
|
* extent data offset 20480 nr 20480 ram 102400
|
|
*
|
|
* key (257 EXTENT_DATA 819200)
|
|
* extent data disk byte 12845056 nr 102400
|
|
* extent data offset 0 nr 102400 ram 102400
|
|
*
|
|
* Where the second one fully references the 100K extent
|
|
* that starts at disk byte 12845056, and the log tree
|
|
* has a single csum item that covers the entire range
|
|
* of the extent:
|
|
*
|
|
* key (EXTENT_CSUM EXTENT_CSUM 12845056) itemsize 100
|
|
*
|
|
* After the first file extent item is replayed, the
|
|
* csum tree gets the following csum item:
|
|
*
|
|
* key (EXTENT_CSUM EXTENT_CSUM 12865536) itemsize 20
|
|
*
|
|
* Which covers the 20K sub-range starting at offset 20K
|
|
* of our extent. Now when we replay the second file
|
|
* extent item, if we do not delete existing csum items
|
|
* that cover any of its blocks, we end up getting two
|
|
* csum items in our csum tree that overlap each other:
|
|
*
|
|
* key (EXTENT_CSUM EXTENT_CSUM 12845056) itemsize 100
|
|
* key (EXTENT_CSUM EXTENT_CSUM 12865536) itemsize 20
|
|
*
|
|
* Which is a problem, because after this anyone trying
|
|
* to lookup up for the checksum of any block of our
|
|
* extent starting at an offset of 40K or higher, will
|
|
* end up looking at the second csum item only, which
|
|
* does not contain the checksum for any block starting
|
|
* at offset 40K or higher of our extent.
|
|
*/
|
|
while (!list_empty(&ordered_sums)) {
|
|
struct btrfs_ordered_sum *sums;
|
|
sums = list_entry(ordered_sums.next,
|
|
struct btrfs_ordered_sum,
|
|
list);
|
|
if (!ret)
|
|
ret = btrfs_del_csums(trans,
|
|
fs_info->csum_root,
|
|
sums->bytenr,
|
|
sums->len);
|
|
if (!ret)
|
|
ret = btrfs_csum_file_blocks(trans,
|
|
fs_info->csum_root, sums);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
if (ret)
|
|
goto out;
|
|
} else {
|
|
btrfs_release_path(path);
|
|
}
|
|
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
|
|
/* inline extents are easy, we just overwrite them */
|
|
ret = overwrite_item(trans, root, path, eb, slot, key);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_inode_set_file_extent_range(BTRFS_I(inode), start,
|
|
extent_end - start);
|
|
if (ret)
|
|
goto out;
|
|
|
|
update_inode:
|
|
btrfs_update_inode_bytes(BTRFS_I(inode), nbytes, drop_args.bytes_found);
|
|
ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
|
|
out:
|
|
if (inode)
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* when cleaning up conflicts between the directory names in the
|
|
* subvolume, directory names in the log and directory names in the
|
|
* inode back references, we may have to unlink inodes from directories.
|
|
*
|
|
* This is a helper function to do the unlink of a specific directory
|
|
* item
|
|
*/
|
|
static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_inode *dir,
|
|
struct btrfs_dir_item *di)
|
|
{
|
|
struct inode *inode;
|
|
char *name;
|
|
int name_len;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key location;
|
|
int ret;
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
btrfs_dir_item_key_to_cpu(leaf, di, &location);
|
|
name_len = btrfs_dir_name_len(leaf, di);
|
|
name = kmalloc(name_len, GFP_NOFS);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len);
|
|
btrfs_release_path(path);
|
|
|
|
inode = read_one_inode(root, location.objectid);
|
|
if (!inode) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
ret = link_to_fixup_dir(trans, root, path, location.objectid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_unlink_inode(trans, root, dir, BTRFS_I(inode), name,
|
|
name_len);
|
|
if (ret)
|
|
goto out;
|
|
else
|
|
ret = btrfs_run_delayed_items(trans);
|
|
out:
|
|
kfree(name);
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper function to see if a given name and sequence number found
|
|
* in an inode back reference are already in a directory and correctly
|
|
* point to this inode
|
|
*/
|
|
static noinline int inode_in_dir(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 dirid, u64 objectid, u64 index,
|
|
const char *name, int name_len)
|
|
{
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key location;
|
|
int match = 0;
|
|
|
|
di = btrfs_lookup_dir_index_item(NULL, root, path, dirid,
|
|
index, name, name_len, 0);
|
|
if (di && !IS_ERR(di)) {
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
|
|
if (location.objectid != objectid)
|
|
goto out;
|
|
} else
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
|
|
di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0);
|
|
if (di && !IS_ERR(di)) {
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
|
|
if (location.objectid != objectid)
|
|
goto out;
|
|
} else
|
|
goto out;
|
|
match = 1;
|
|
out:
|
|
btrfs_release_path(path);
|
|
return match;
|
|
}
|
|
|
|
/*
|
|
* helper function to check a log tree for a named back reference in
|
|
* an inode. This is used to decide if a back reference that is
|
|
* found in the subvolume conflicts with what we find in the log.
|
|
*
|
|
* inode backreferences may have multiple refs in a single item,
|
|
* during replay we process one reference at a time, and we don't
|
|
* want to delete valid links to a file from the subvolume if that
|
|
* link is also in the log.
|
|
*/
|
|
static noinline int backref_in_log(struct btrfs_root *log,
|
|
struct btrfs_key *key,
|
|
u64 ref_objectid,
|
|
const char *name, int namelen)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(NULL, log, key, path, 0, 0);
|
|
if (ret < 0) {
|
|
goto out;
|
|
} else if (ret == 1) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (key->type == BTRFS_INODE_EXTREF_KEY)
|
|
ret = !!btrfs_find_name_in_ext_backref(path->nodes[0],
|
|
path->slots[0],
|
|
ref_objectid,
|
|
name, namelen);
|
|
else
|
|
ret = !!btrfs_find_name_in_backref(path->nodes[0],
|
|
path->slots[0],
|
|
name, namelen);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static inline int __add_inode_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_root *log_root,
|
|
struct btrfs_inode *dir,
|
|
struct btrfs_inode *inode,
|
|
u64 inode_objectid, u64 parent_objectid,
|
|
u64 ref_index, char *name, int namelen,
|
|
int *search_done)
|
|
{
|
|
int ret;
|
|
char *victim_name;
|
|
int victim_name_len;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key search_key;
|
|
struct btrfs_inode_extref *extref;
|
|
|
|
again:
|
|
/* Search old style refs */
|
|
search_key.objectid = inode_objectid;
|
|
search_key.type = BTRFS_INODE_REF_KEY;
|
|
search_key.offset = parent_objectid;
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret == 0) {
|
|
struct btrfs_inode_ref *victim_ref;
|
|
unsigned long ptr;
|
|
unsigned long ptr_end;
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
/* are we trying to overwrite a back ref for the root directory
|
|
* if so, just jump out, we're done
|
|
*/
|
|
if (search_key.objectid == search_key.offset)
|
|
return 1;
|
|
|
|
/* check all the names in this back reference to see
|
|
* if they are in the log. if so, we allow them to stay
|
|
* otherwise they must be unlinked as a conflict
|
|
*/
|
|
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]);
|
|
while (ptr < ptr_end) {
|
|
victim_ref = (struct btrfs_inode_ref *)ptr;
|
|
victim_name_len = btrfs_inode_ref_name_len(leaf,
|
|
victim_ref);
|
|
victim_name = kmalloc(victim_name_len, GFP_NOFS);
|
|
if (!victim_name)
|
|
return -ENOMEM;
|
|
|
|
read_extent_buffer(leaf, victim_name,
|
|
(unsigned long)(victim_ref + 1),
|
|
victim_name_len);
|
|
|
|
ret = backref_in_log(log_root, &search_key,
|
|
parent_objectid, victim_name,
|
|
victim_name_len);
|
|
if (ret < 0) {
|
|
kfree(victim_name);
|
|
return ret;
|
|
} else if (!ret) {
|
|
inc_nlink(&inode->vfs_inode);
|
|
btrfs_release_path(path);
|
|
|
|
ret = btrfs_unlink_inode(trans, root, dir, inode,
|
|
victim_name, victim_name_len);
|
|
kfree(victim_name);
|
|
if (ret)
|
|
return ret;
|
|
ret = btrfs_run_delayed_items(trans);
|
|
if (ret)
|
|
return ret;
|
|
*search_done = 1;
|
|
goto again;
|
|
}
|
|
kfree(victim_name);
|
|
|
|
ptr = (unsigned long)(victim_ref + 1) + victim_name_len;
|
|
}
|
|
|
|
/*
|
|
* NOTE: we have searched root tree and checked the
|
|
* corresponding ref, it does not need to check again.
|
|
*/
|
|
*search_done = 1;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/* Same search but for extended refs */
|
|
extref = btrfs_lookup_inode_extref(NULL, root, path, name, namelen,
|
|
inode_objectid, parent_objectid, 0,
|
|
0);
|
|
if (!IS_ERR_OR_NULL(extref)) {
|
|
u32 item_size;
|
|
u32 cur_offset = 0;
|
|
unsigned long base;
|
|
struct inode *victim_parent;
|
|
|
|
leaf = path->nodes[0];
|
|
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
base = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
|
|
while (cur_offset < item_size) {
|
|
extref = (struct btrfs_inode_extref *)(base + cur_offset);
|
|
|
|
victim_name_len = btrfs_inode_extref_name_len(leaf, extref);
|
|
|
|
if (btrfs_inode_extref_parent(leaf, extref) != parent_objectid)
|
|
goto next;
|
|
|
|
victim_name = kmalloc(victim_name_len, GFP_NOFS);
|
|
if (!victim_name)
|
|
return -ENOMEM;
|
|
read_extent_buffer(leaf, victim_name, (unsigned long)&extref->name,
|
|
victim_name_len);
|
|
|
|
search_key.objectid = inode_objectid;
|
|
search_key.type = BTRFS_INODE_EXTREF_KEY;
|
|
search_key.offset = btrfs_extref_hash(parent_objectid,
|
|
victim_name,
|
|
victim_name_len);
|
|
ret = backref_in_log(log_root, &search_key,
|
|
parent_objectid, victim_name,
|
|
victim_name_len);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (!ret) {
|
|
ret = -ENOENT;
|
|
victim_parent = read_one_inode(root,
|
|
parent_objectid);
|
|
if (victim_parent) {
|
|
inc_nlink(&inode->vfs_inode);
|
|
btrfs_release_path(path);
|
|
|
|
ret = btrfs_unlink_inode(trans, root,
|
|
BTRFS_I(victim_parent),
|
|
inode,
|
|
victim_name,
|
|
victim_name_len);
|
|
if (!ret)
|
|
ret = btrfs_run_delayed_items(
|
|
trans);
|
|
}
|
|
iput(victim_parent);
|
|
kfree(victim_name);
|
|
if (ret)
|
|
return ret;
|
|
*search_done = 1;
|
|
goto again;
|
|
}
|
|
kfree(victim_name);
|
|
next:
|
|
cur_offset += victim_name_len + sizeof(*extref);
|
|
}
|
|
*search_done = 1;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/* look for a conflicting sequence number */
|
|
di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir),
|
|
ref_index, name, namelen, 0);
|
|
if (di && !IS_ERR(di)) {
|
|
ret = drop_one_dir_item(trans, root, path, dir, di);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/* look for a conflicting name */
|
|
di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir),
|
|
name, namelen, 0);
|
|
if (di && !IS_ERR(di)) {
|
|
ret = drop_one_dir_item(trans, root, path, dir, di);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr,
|
|
u32 *namelen, char **name, u64 *index,
|
|
u64 *parent_objectid)
|
|
{
|
|
struct btrfs_inode_extref *extref;
|
|
|
|
extref = (struct btrfs_inode_extref *)ref_ptr;
|
|
|
|
*namelen = btrfs_inode_extref_name_len(eb, extref);
|
|
*name = kmalloc(*namelen, GFP_NOFS);
|
|
if (*name == NULL)
|
|
return -ENOMEM;
|
|
|
|
read_extent_buffer(eb, *name, (unsigned long)&extref->name,
|
|
*namelen);
|
|
|
|
if (index)
|
|
*index = btrfs_inode_extref_index(eb, extref);
|
|
if (parent_objectid)
|
|
*parent_objectid = btrfs_inode_extref_parent(eb, extref);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr,
|
|
u32 *namelen, char **name, u64 *index)
|
|
{
|
|
struct btrfs_inode_ref *ref;
|
|
|
|
ref = (struct btrfs_inode_ref *)ref_ptr;
|
|
|
|
*namelen = btrfs_inode_ref_name_len(eb, ref);
|
|
*name = kmalloc(*namelen, GFP_NOFS);
|
|
if (*name == NULL)
|
|
return -ENOMEM;
|
|
|
|
read_extent_buffer(eb, *name, (unsigned long)(ref + 1), *namelen);
|
|
|
|
if (index)
|
|
*index = btrfs_inode_ref_index(eb, ref);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Take an inode reference item from the log tree and iterate all names from the
|
|
* inode reference item in the subvolume tree with the same key (if it exists).
|
|
* For any name that is not in the inode reference item from the log tree, do a
|
|
* proper unlink of that name (that is, remove its entry from the inode
|
|
* reference item and both dir index keys).
|
|
*/
|
|
static int unlink_old_inode_refs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_inode *inode,
|
|
struct extent_buffer *log_eb,
|
|
int log_slot,
|
|
struct btrfs_key *key)
|
|
{
|
|
int ret;
|
|
unsigned long ref_ptr;
|
|
unsigned long ref_end;
|
|
struct extent_buffer *eb;
|
|
|
|
again:
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
eb = path->nodes[0];
|
|
ref_ptr = btrfs_item_ptr_offset(eb, path->slots[0]);
|
|
ref_end = ref_ptr + btrfs_item_size_nr(eb, path->slots[0]);
|
|
while (ref_ptr < ref_end) {
|
|
char *name = NULL;
|
|
int namelen;
|
|
u64 parent_id;
|
|
|
|
if (key->type == BTRFS_INODE_EXTREF_KEY) {
|
|
ret = extref_get_fields(eb, ref_ptr, &namelen, &name,
|
|
NULL, &parent_id);
|
|
} else {
|
|
parent_id = key->offset;
|
|
ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
|
|
NULL);
|
|
}
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (key->type == BTRFS_INODE_EXTREF_KEY)
|
|
ret = !!btrfs_find_name_in_ext_backref(log_eb, log_slot,
|
|
parent_id, name,
|
|
namelen);
|
|
else
|
|
ret = !!btrfs_find_name_in_backref(log_eb, log_slot,
|
|
name, namelen);
|
|
|
|
if (!ret) {
|
|
struct inode *dir;
|
|
|
|
btrfs_release_path(path);
|
|
dir = read_one_inode(root, parent_id);
|
|
if (!dir) {
|
|
ret = -ENOENT;
|
|
kfree(name);
|
|
goto out;
|
|
}
|
|
ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
|
|
inode, name, namelen);
|
|
kfree(name);
|
|
iput(dir);
|
|
if (ret)
|
|
goto out;
|
|
goto again;
|
|
}
|
|
|
|
kfree(name);
|
|
ref_ptr += namelen;
|
|
if (key->type == BTRFS_INODE_EXTREF_KEY)
|
|
ref_ptr += sizeof(struct btrfs_inode_extref);
|
|
else
|
|
ref_ptr += sizeof(struct btrfs_inode_ref);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_inode_ref_exists(struct inode *inode, struct inode *dir,
|
|
const u8 ref_type, const char *name,
|
|
const int namelen)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
const u64 parent_id = btrfs_ino(BTRFS_I(dir));
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = btrfs_ino(BTRFS_I(inode));
|
|
key.type = ref_type;
|
|
if (key.type == BTRFS_INODE_REF_KEY)
|
|
key.offset = parent_id;
|
|
else
|
|
key.offset = btrfs_extref_hash(parent_id, name, namelen);
|
|
|
|
ret = btrfs_search_slot(NULL, BTRFS_I(inode)->root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
if (key.type == BTRFS_INODE_EXTREF_KEY)
|
|
ret = !!btrfs_find_name_in_ext_backref(path->nodes[0],
|
|
path->slots[0], parent_id, name, namelen);
|
|
else
|
|
ret = !!btrfs_find_name_in_backref(path->nodes[0], path->slots[0],
|
|
name, namelen);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct inode *dir, struct inode *inode, const char *name,
|
|
int namelen, u64 ref_index)
|
|
{
|
|
struct btrfs_dir_item *dir_item;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
struct inode *other_inode = NULL;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
dir_item = btrfs_lookup_dir_item(NULL, root, path,
|
|
btrfs_ino(BTRFS_I(dir)),
|
|
name, namelen, 0);
|
|
if (!dir_item) {
|
|
btrfs_release_path(path);
|
|
goto add_link;
|
|
} else if (IS_ERR(dir_item)) {
|
|
ret = PTR_ERR(dir_item);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Our inode's dentry collides with the dentry of another inode which is
|
|
* in the log but not yet processed since it has a higher inode number.
|
|
* So delete that other dentry.
|
|
*/
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], dir_item, &key);
|
|
btrfs_release_path(path);
|
|
other_inode = read_one_inode(root, key.objectid);
|
|
if (!other_inode) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), BTRFS_I(other_inode),
|
|
name, namelen);
|
|
if (ret)
|
|
goto out;
|
|
/*
|
|
* If we dropped the link count to 0, bump it so that later the iput()
|
|
* on the inode will not free it. We will fixup the link count later.
|
|
*/
|
|
if (other_inode->i_nlink == 0)
|
|
inc_nlink(other_inode);
|
|
|
|
ret = btrfs_run_delayed_items(trans);
|
|
if (ret)
|
|
goto out;
|
|
add_link:
|
|
ret = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode),
|
|
name, namelen, 0, ref_index);
|
|
out:
|
|
iput(other_inode);
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* replay one inode back reference item found in the log tree.
|
|
* eb, slot and key refer to the buffer and key found in the log tree.
|
|
* root is the destination we are replaying into, and path is for temp
|
|
* use by this function. (it should be released on return).
|
|
*/
|
|
static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
struct extent_buffer *eb, int slot,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct inode *dir = NULL;
|
|
struct inode *inode = NULL;
|
|
unsigned long ref_ptr;
|
|
unsigned long ref_end;
|
|
char *name = NULL;
|
|
int namelen;
|
|
int ret;
|
|
int search_done = 0;
|
|
int log_ref_ver = 0;
|
|
u64 parent_objectid;
|
|
u64 inode_objectid;
|
|
u64 ref_index = 0;
|
|
int ref_struct_size;
|
|
|
|
ref_ptr = btrfs_item_ptr_offset(eb, slot);
|
|
ref_end = ref_ptr + btrfs_item_size_nr(eb, slot);
|
|
|
|
if (key->type == BTRFS_INODE_EXTREF_KEY) {
|
|
struct btrfs_inode_extref *r;
|
|
|
|
ref_struct_size = sizeof(struct btrfs_inode_extref);
|
|
log_ref_ver = 1;
|
|
r = (struct btrfs_inode_extref *)ref_ptr;
|
|
parent_objectid = btrfs_inode_extref_parent(eb, r);
|
|
} else {
|
|
ref_struct_size = sizeof(struct btrfs_inode_ref);
|
|
parent_objectid = key->offset;
|
|
}
|
|
inode_objectid = key->objectid;
|
|
|
|
/*
|
|
* it is possible that we didn't log all the parent directories
|
|
* for a given inode. If we don't find the dir, just don't
|
|
* copy the back ref in. The link count fixup code will take
|
|
* care of the rest
|
|
*/
|
|
dir = read_one_inode(root, parent_objectid);
|
|
if (!dir) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
inode = read_one_inode(root, inode_objectid);
|
|
if (!inode) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
while (ref_ptr < ref_end) {
|
|
if (log_ref_ver) {
|
|
ret = extref_get_fields(eb, ref_ptr, &namelen, &name,
|
|
&ref_index, &parent_objectid);
|
|
/*
|
|
* parent object can change from one array
|
|
* item to another.
|
|
*/
|
|
if (!dir)
|
|
dir = read_one_inode(root, parent_objectid);
|
|
if (!dir) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
} else {
|
|
ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
|
|
&ref_index);
|
|
}
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* if we already have a perfect match, we're done */
|
|
if (!inode_in_dir(root, path, btrfs_ino(BTRFS_I(dir)),
|
|
btrfs_ino(BTRFS_I(inode)), ref_index,
|
|
name, namelen)) {
|
|
/*
|
|
* look for a conflicting back reference in the
|
|
* metadata. if we find one we have to unlink that name
|
|
* of the file before we add our new link. Later on, we
|
|
* overwrite any existing back reference, and we don't
|
|
* want to create dangling pointers in the directory.
|
|
*/
|
|
|
|
if (!search_done) {
|
|
ret = __add_inode_ref(trans, root, path, log,
|
|
BTRFS_I(dir),
|
|
BTRFS_I(inode),
|
|
inode_objectid,
|
|
parent_objectid,
|
|
ref_index, name, namelen,
|
|
&search_done);
|
|
if (ret) {
|
|
if (ret == 1)
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If a reference item already exists for this inode
|
|
* with the same parent and name, but different index,
|
|
* drop it and the corresponding directory index entries
|
|
* from the parent before adding the new reference item
|
|
* and dir index entries, otherwise we would fail with
|
|
* -EEXIST returned from btrfs_add_link() below.
|
|
*/
|
|
ret = btrfs_inode_ref_exists(inode, dir, key->type,
|
|
name, namelen);
|
|
if (ret > 0) {
|
|
ret = btrfs_unlink_inode(trans, root,
|
|
BTRFS_I(dir),
|
|
BTRFS_I(inode),
|
|
name, namelen);
|
|
/*
|
|
* If we dropped the link count to 0, bump it so
|
|
* that later the iput() on the inode will not
|
|
* free it. We will fixup the link count later.
|
|
*/
|
|
if (!ret && inode->i_nlink == 0)
|
|
inc_nlink(inode);
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* insert our name */
|
|
ret = add_link(trans, root, dir, inode, name, namelen,
|
|
ref_index);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_update_inode(trans, root, BTRFS_I(inode));
|
|
}
|
|
|
|
ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen;
|
|
kfree(name);
|
|
name = NULL;
|
|
if (log_ref_ver) {
|
|
iput(dir);
|
|
dir = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Before we overwrite the inode reference item in the subvolume tree
|
|
* with the item from the log tree, we must unlink all names from the
|
|
* parent directory that are in the subvolume's tree inode reference
|
|
* item, otherwise we end up with an inconsistent subvolume tree where
|
|
* dir index entries exist for a name but there is no inode reference
|
|
* item with the same name.
|
|
*/
|
|
ret = unlink_old_inode_refs(trans, root, path, BTRFS_I(inode), eb, slot,
|
|
key);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* finally write the back reference in the inode */
|
|
ret = overwrite_item(trans, root, path, eb, slot, key);
|
|
out:
|
|
btrfs_release_path(path);
|
|
kfree(name);
|
|
iput(dir);
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
static int count_inode_extrefs(struct btrfs_root *root,
|
|
struct btrfs_inode *inode, struct btrfs_path *path)
|
|
{
|
|
int ret = 0;
|
|
int name_len;
|
|
unsigned int nlink = 0;
|
|
u32 item_size;
|
|
u32 cur_offset = 0;
|
|
u64 inode_objectid = btrfs_ino(inode);
|
|
u64 offset = 0;
|
|
unsigned long ptr;
|
|
struct btrfs_inode_extref *extref;
|
|
struct extent_buffer *leaf;
|
|
|
|
while (1) {
|
|
ret = btrfs_find_one_extref(root, inode_objectid, offset, path,
|
|
&extref, &offset);
|
|
if (ret)
|
|
break;
|
|
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
cur_offset = 0;
|
|
|
|
while (cur_offset < item_size) {
|
|
extref = (struct btrfs_inode_extref *) (ptr + cur_offset);
|
|
name_len = btrfs_inode_extref_name_len(leaf, extref);
|
|
|
|
nlink++;
|
|
|
|
cur_offset += name_len + sizeof(*extref);
|
|
}
|
|
|
|
offset++;
|
|
btrfs_release_path(path);
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (ret < 0 && ret != -ENOENT)
|
|
return ret;
|
|
return nlink;
|
|
}
|
|
|
|
static int count_inode_refs(struct btrfs_root *root,
|
|
struct btrfs_inode *inode, struct btrfs_path *path)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
unsigned int nlink = 0;
|
|
unsigned long ptr;
|
|
unsigned long ptr_end;
|
|
int name_len;
|
|
u64 ino = btrfs_ino(inode);
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
break;
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
}
|
|
process_slot:
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key,
|
|
path->slots[0]);
|
|
if (key.objectid != ino ||
|
|
key.type != BTRFS_INODE_REF_KEY)
|
|
break;
|
|
ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]);
|
|
ptr_end = ptr + btrfs_item_size_nr(path->nodes[0],
|
|
path->slots[0]);
|
|
while (ptr < ptr_end) {
|
|
struct btrfs_inode_ref *ref;
|
|
|
|
ref = (struct btrfs_inode_ref *)ptr;
|
|
name_len = btrfs_inode_ref_name_len(path->nodes[0],
|
|
ref);
|
|
ptr = (unsigned long)(ref + 1) + name_len;
|
|
nlink++;
|
|
}
|
|
|
|
if (key.offset == 0)
|
|
break;
|
|
if (path->slots[0] > 0) {
|
|
path->slots[0]--;
|
|
goto process_slot;
|
|
}
|
|
key.offset--;
|
|
btrfs_release_path(path);
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
return nlink;
|
|
}
|
|
|
|
/*
|
|
* There are a few corners where the link count of the file can't
|
|
* be properly maintained during replay. So, instead of adding
|
|
* lots of complexity to the log code, we just scan the backrefs
|
|
* for any file that has been through replay.
|
|
*
|
|
* The scan will update the link count on the inode to reflect the
|
|
* number of back refs found. If it goes down to zero, the iput
|
|
* will free the inode.
|
|
*/
|
|
static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
u64 nlink = 0;
|
|
u64 ino = btrfs_ino(BTRFS_I(inode));
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = count_inode_refs(root, BTRFS_I(inode), path);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
nlink = ret;
|
|
|
|
ret = count_inode_extrefs(root, BTRFS_I(inode), path);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
nlink += ret;
|
|
|
|
ret = 0;
|
|
|
|
if (nlink != inode->i_nlink) {
|
|
set_nlink(inode, nlink);
|
|
btrfs_update_inode(trans, root, BTRFS_I(inode));
|
|
}
|
|
BTRFS_I(inode)->index_cnt = (u64)-1;
|
|
|
|
if (inode->i_nlink == 0) {
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
ret = replay_dir_deletes(trans, root, NULL, path,
|
|
ino, 1);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
ret = btrfs_insert_orphan_item(trans, root, ino);
|
|
if (ret == -EEXIST)
|
|
ret = 0;
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
struct inode *inode;
|
|
|
|
key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID;
|
|
key.type = BTRFS_ORPHAN_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
while (1) {
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
if (ret == 1) {
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID ||
|
|
key.type != BTRFS_ORPHAN_ITEM_KEY)
|
|
break;
|
|
|
|
ret = btrfs_del_item(trans, root, path);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
inode = read_one_inode(root, key.offset);
|
|
if (!inode)
|
|
return -EIO;
|
|
|
|
ret = fixup_inode_link_count(trans, root, inode);
|
|
iput(inode);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* fixup on a directory may create new entries,
|
|
* make sure we always look for the highset possible
|
|
* offset
|
|
*/
|
|
key.offset = (u64)-1;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* record a given inode in the fixup dir so we can check its link
|
|
* count when replay is done. The link count is incremented here
|
|
* so the inode won't go away until we check it
|
|
*/
|
|
static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_key key;
|
|
int ret = 0;
|
|
struct inode *inode;
|
|
|
|
inode = read_one_inode(root, objectid);
|
|
if (!inode)
|
|
return -EIO;
|
|
|
|
key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID;
|
|
key.type = BTRFS_ORPHAN_ITEM_KEY;
|
|
key.offset = objectid;
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
|
|
|
|
btrfs_release_path(path);
|
|
if (ret == 0) {
|
|
if (!inode->i_nlink)
|
|
set_nlink(inode, 1);
|
|
else
|
|
inc_nlink(inode);
|
|
ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
|
|
} else if (ret == -EEXIST) {
|
|
ret = 0;
|
|
} else {
|
|
BUG(); /* Logic Error */
|
|
}
|
|
iput(inode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* when replaying the log for a directory, we only insert names
|
|
* for inodes that actually exist. This means an fsync on a directory
|
|
* does not implicitly fsync all the new files in it
|
|
*/
|
|
static noinline int insert_one_name(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 dirid, u64 index,
|
|
char *name, int name_len,
|
|
struct btrfs_key *location)
|
|
{
|
|
struct inode *inode;
|
|
struct inode *dir;
|
|
int ret;
|
|
|
|
inode = read_one_inode(root, location->objectid);
|
|
if (!inode)
|
|
return -ENOENT;
|
|
|
|
dir = read_one_inode(root, dirid);
|
|
if (!dir) {
|
|
iput(inode);
|
|
return -EIO;
|
|
}
|
|
|
|
ret = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode), name,
|
|
name_len, 1, index);
|
|
|
|
/* FIXME, put inode into FIXUP list */
|
|
|
|
iput(inode);
|
|
iput(dir);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* take a single entry in a log directory item and replay it into
|
|
* the subvolume.
|
|
*
|
|
* if a conflicting item exists in the subdirectory already,
|
|
* the inode it points to is unlinked and put into the link count
|
|
* fix up tree.
|
|
*
|
|
* If a name from the log points to a file or directory that does
|
|
* not exist in the FS, it is skipped. fsyncs on directories
|
|
* do not force down inodes inside that directory, just changes to the
|
|
* names or unlinks in a directory.
|
|
*
|
|
* Returns < 0 on error, 0 if the name wasn't replayed (dentry points to a
|
|
* non-existing inode) and 1 if the name was replayed.
|
|
*/
|
|
static noinline int replay_one_name(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct extent_buffer *eb,
|
|
struct btrfs_dir_item *di,
|
|
struct btrfs_key *key)
|
|
{
|
|
char *name;
|
|
int name_len;
|
|
struct btrfs_dir_item *dst_di;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_key log_key;
|
|
struct inode *dir;
|
|
u8 log_type;
|
|
int exists;
|
|
int ret = 0;
|
|
bool update_size = (key->type == BTRFS_DIR_INDEX_KEY);
|
|
bool name_added = false;
|
|
|
|
dir = read_one_inode(root, key->objectid);
|
|
if (!dir)
|
|
return -EIO;
|
|
|
|
name_len = btrfs_dir_name_len(eb, di);
|
|
name = kmalloc(name_len, GFP_NOFS);
|
|
if (!name) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
log_type = btrfs_dir_type(eb, di);
|
|
read_extent_buffer(eb, name, (unsigned long)(di + 1),
|
|
name_len);
|
|
|
|
btrfs_dir_item_key_to_cpu(eb, di, &log_key);
|
|
exists = btrfs_lookup_inode(trans, root, path, &log_key, 0);
|
|
if (exists == 0)
|
|
exists = 1;
|
|
else
|
|
exists = 0;
|
|
btrfs_release_path(path);
|
|
|
|
if (key->type == BTRFS_DIR_ITEM_KEY) {
|
|
dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid,
|
|
name, name_len, 1);
|
|
} else if (key->type == BTRFS_DIR_INDEX_KEY) {
|
|
dst_di = btrfs_lookup_dir_index_item(trans, root, path,
|
|
key->objectid,
|
|
key->offset, name,
|
|
name_len, 1);
|
|
} else {
|
|
/* Corruption */
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (IS_ERR_OR_NULL(dst_di)) {
|
|
/* we need a sequence number to insert, so we only
|
|
* do inserts for the BTRFS_DIR_INDEX_KEY types
|
|
*/
|
|
if (key->type != BTRFS_DIR_INDEX_KEY)
|
|
goto out;
|
|
goto insert;
|
|
}
|
|
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key);
|
|
/* the existing item matches the logged item */
|
|
if (found_key.objectid == log_key.objectid &&
|
|
found_key.type == log_key.type &&
|
|
found_key.offset == log_key.offset &&
|
|
btrfs_dir_type(path->nodes[0], dst_di) == log_type) {
|
|
update_size = false;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* don't drop the conflicting directory entry if the inode
|
|
* for the new entry doesn't exist
|
|
*/
|
|
if (!exists)
|
|
goto out;
|
|
|
|
ret = drop_one_dir_item(trans, root, path, BTRFS_I(dir), dst_di);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (key->type == BTRFS_DIR_INDEX_KEY)
|
|
goto insert;
|
|
out:
|
|
btrfs_release_path(path);
|
|
if (!ret && update_size) {
|
|
btrfs_i_size_write(BTRFS_I(dir), dir->i_size + name_len * 2);
|
|
ret = btrfs_update_inode(trans, root, BTRFS_I(dir));
|
|
}
|
|
kfree(name);
|
|
iput(dir);
|
|
if (!ret && name_added)
|
|
ret = 1;
|
|
return ret;
|
|
|
|
insert:
|
|
/*
|
|
* Check if the inode reference exists in the log for the given name,
|
|
* inode and parent inode
|
|
*/
|
|
found_key.objectid = log_key.objectid;
|
|
found_key.type = BTRFS_INODE_REF_KEY;
|
|
found_key.offset = key->objectid;
|
|
ret = backref_in_log(root->log_root, &found_key, 0, name, name_len);
|
|
if (ret < 0) {
|
|
goto out;
|
|
} else if (ret) {
|
|
/* The dentry will be added later. */
|
|
ret = 0;
|
|
update_size = false;
|
|
goto out;
|
|
}
|
|
|
|
found_key.objectid = log_key.objectid;
|
|
found_key.type = BTRFS_INODE_EXTREF_KEY;
|
|
found_key.offset = key->objectid;
|
|
ret = backref_in_log(root->log_root, &found_key, key->objectid, name,
|
|
name_len);
|
|
if (ret < 0) {
|
|
goto out;
|
|
} else if (ret) {
|
|
/* The dentry will be added later. */
|
|
ret = 0;
|
|
update_size = false;
|
|
goto out;
|
|
}
|
|
btrfs_release_path(path);
|
|
ret = insert_one_name(trans, root, key->objectid, key->offset,
|
|
name, name_len, &log_key);
|
|
if (ret && ret != -ENOENT && ret != -EEXIST)
|
|
goto out;
|
|
if (!ret)
|
|
name_added = true;
|
|
update_size = false;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* find all the names in a directory item and reconcile them into
|
|
* the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than
|
|
* one name in a directory item, but the same code gets used for
|
|
* both directory index types
|
|
*/
|
|
static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct extent_buffer *eb, int slot,
|
|
struct btrfs_key *key)
|
|
{
|
|
int ret = 0;
|
|
u32 item_size = btrfs_item_size_nr(eb, slot);
|
|
struct btrfs_dir_item *di;
|
|
int name_len;
|
|
unsigned long ptr;
|
|
unsigned long ptr_end;
|
|
struct btrfs_path *fixup_path = NULL;
|
|
|
|
ptr = btrfs_item_ptr_offset(eb, slot);
|
|
ptr_end = ptr + item_size;
|
|
while (ptr < ptr_end) {
|
|
di = (struct btrfs_dir_item *)ptr;
|
|
name_len = btrfs_dir_name_len(eb, di);
|
|
ret = replay_one_name(trans, root, path, eb, di, key);
|
|
if (ret < 0)
|
|
break;
|
|
ptr = (unsigned long)(di + 1);
|
|
ptr += name_len;
|
|
|
|
/*
|
|
* If this entry refers to a non-directory (directories can not
|
|
* have a link count > 1) and it was added in the transaction
|
|
* that was not committed, make sure we fixup the link count of
|
|
* the inode it the entry points to. Otherwise something like
|
|
* the following would result in a directory pointing to an
|
|
* inode with a wrong link that does not account for this dir
|
|
* entry:
|
|
*
|
|
* mkdir testdir
|
|
* touch testdir/foo
|
|
* touch testdir/bar
|
|
* sync
|
|
*
|
|
* ln testdir/bar testdir/bar_link
|
|
* ln testdir/foo testdir/foo_link
|
|
* xfs_io -c "fsync" testdir/bar
|
|
*
|
|
* <power failure>
|
|
*
|
|
* mount fs, log replay happens
|
|
*
|
|
* File foo would remain with a link count of 1 when it has two
|
|
* entries pointing to it in the directory testdir. This would
|
|
* make it impossible to ever delete the parent directory has
|
|
* it would result in stale dentries that can never be deleted.
|
|
*/
|
|
if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) {
|
|
struct btrfs_key di_key;
|
|
|
|
if (!fixup_path) {
|
|
fixup_path = btrfs_alloc_path();
|
|
if (!fixup_path) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
}
|
|
|
|
btrfs_dir_item_key_to_cpu(eb, di, &di_key);
|
|
ret = link_to_fixup_dir(trans, root, fixup_path,
|
|
di_key.objectid);
|
|
if (ret)
|
|
break;
|
|
}
|
|
ret = 0;
|
|
}
|
|
btrfs_free_path(fixup_path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* directory replay has two parts. There are the standard directory
|
|
* items in the log copied from the subvolume, and range items
|
|
* created in the log while the subvolume was logged.
|
|
*
|
|
* The range items tell us which parts of the key space the log
|
|
* is authoritative for. During replay, if a key in the subvolume
|
|
* directory is in a logged range item, but not actually in the log
|
|
* that means it was deleted from the directory before the fsync
|
|
* and should be removed.
|
|
*/
|
|
static noinline int find_dir_range(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 dirid, int key_type,
|
|
u64 *start_ret, u64 *end_ret)
|
|
{
|
|
struct btrfs_key key;
|
|
u64 found_end;
|
|
struct btrfs_dir_log_item *item;
|
|
int ret;
|
|
int nritems;
|
|
|
|
if (*start_ret == (u64)-1)
|
|
return 1;
|
|
|
|
key.objectid = dirid;
|
|
key.type = key_type;
|
|
key.offset = *start_ret;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
goto out;
|
|
path->slots[0]--;
|
|
}
|
|
if (ret != 0)
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
|
|
if (key.type != key_type || key.objectid != dirid) {
|
|
ret = 1;
|
|
goto next;
|
|
}
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_dir_log_item);
|
|
found_end = btrfs_dir_log_end(path->nodes[0], item);
|
|
|
|
if (*start_ret >= key.offset && *start_ret <= found_end) {
|
|
ret = 0;
|
|
*start_ret = key.offset;
|
|
*end_ret = found_end;
|
|
goto out;
|
|
}
|
|
ret = 1;
|
|
next:
|
|
/* check the next slot in the tree to see if it is a valid item */
|
|
nritems = btrfs_header_nritems(path->nodes[0]);
|
|
path->slots[0]++;
|
|
if (path->slots[0] >= nritems) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
|
|
if (key.type != key_type || key.objectid != dirid) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_dir_log_item);
|
|
found_end = btrfs_dir_log_end(path->nodes[0], item);
|
|
*start_ret = key.offset;
|
|
*end_ret = found_end;
|
|
ret = 0;
|
|
out:
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* this looks for a given directory item in the log. If the directory
|
|
* item is not in the log, the item is removed and the inode it points
|
|
* to is unlinked
|
|
*/
|
|
static noinline int check_item_in_log(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
struct btrfs_path *log_path,
|
|
struct inode *dir,
|
|
struct btrfs_key *dir_key)
|
|
{
|
|
int ret;
|
|
struct extent_buffer *eb;
|
|
int slot;
|
|
u32 item_size;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_dir_item *log_di;
|
|
int name_len;
|
|
unsigned long ptr;
|
|
unsigned long ptr_end;
|
|
char *name;
|
|
struct inode *inode;
|
|
struct btrfs_key location;
|
|
|
|
again:
|
|
eb = path->nodes[0];
|
|
slot = path->slots[0];
|
|
item_size = btrfs_item_size_nr(eb, slot);
|
|
ptr = btrfs_item_ptr_offset(eb, slot);
|
|
ptr_end = ptr + item_size;
|
|
while (ptr < ptr_end) {
|
|
di = (struct btrfs_dir_item *)ptr;
|
|
name_len = btrfs_dir_name_len(eb, di);
|
|
name = kmalloc(name_len, GFP_NOFS);
|
|
if (!name) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
read_extent_buffer(eb, name, (unsigned long)(di + 1),
|
|
name_len);
|
|
log_di = NULL;
|
|
if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) {
|
|
log_di = btrfs_lookup_dir_item(trans, log, log_path,
|
|
dir_key->objectid,
|
|
name, name_len, 0);
|
|
} else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) {
|
|
log_di = btrfs_lookup_dir_index_item(trans, log,
|
|
log_path,
|
|
dir_key->objectid,
|
|
dir_key->offset,
|
|
name, name_len, 0);
|
|
}
|
|
if (!log_di || log_di == ERR_PTR(-ENOENT)) {
|
|
btrfs_dir_item_key_to_cpu(eb, di, &location);
|
|
btrfs_release_path(path);
|
|
btrfs_release_path(log_path);
|
|
inode = read_one_inode(root, location.objectid);
|
|
if (!inode) {
|
|
kfree(name);
|
|
return -EIO;
|
|
}
|
|
|
|
ret = link_to_fixup_dir(trans, root,
|
|
path, location.objectid);
|
|
if (ret) {
|
|
kfree(name);
|
|
iput(inode);
|
|
goto out;
|
|
}
|
|
|
|
inc_nlink(inode);
|
|
ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
|
|
BTRFS_I(inode), name, name_len);
|
|
if (!ret)
|
|
ret = btrfs_run_delayed_items(trans);
|
|
kfree(name);
|
|
iput(inode);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* there might still be more names under this key
|
|
* check and repeat if required
|
|
*/
|
|
ret = btrfs_search_slot(NULL, root, dir_key, path,
|
|
0, 0);
|
|
if (ret == 0)
|
|
goto again;
|
|
ret = 0;
|
|
goto out;
|
|
} else if (IS_ERR(log_di)) {
|
|
kfree(name);
|
|
return PTR_ERR(log_di);
|
|
}
|
|
btrfs_release_path(log_path);
|
|
kfree(name);
|
|
|
|
ptr = (unsigned long)(di + 1);
|
|
ptr += name_len;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_release_path(path);
|
|
btrfs_release_path(log_path);
|
|
return ret;
|
|
}
|
|
|
|
static int replay_xattr_deletes(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
const u64 ino)
|
|
{
|
|
struct btrfs_key search_key;
|
|
struct btrfs_path *log_path;
|
|
int i;
|
|
int nritems;
|
|
int ret;
|
|
|
|
log_path = btrfs_alloc_path();
|
|
if (!log_path)
|
|
return -ENOMEM;
|
|
|
|
search_key.objectid = ino;
|
|
search_key.type = BTRFS_XATTR_ITEM_KEY;
|
|
search_key.offset = 0;
|
|
again:
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
process_leaf:
|
|
nritems = btrfs_header_nritems(path->nodes[0]);
|
|
for (i = path->slots[0]; i < nritems; i++) {
|
|
struct btrfs_key key;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_dir_item *log_di;
|
|
u32 total_size;
|
|
u32 cur;
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, i);
|
|
if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
di = btrfs_item_ptr(path->nodes[0], i, struct btrfs_dir_item);
|
|
total_size = btrfs_item_size_nr(path->nodes[0], i);
|
|
cur = 0;
|
|
while (cur < total_size) {
|
|
u16 name_len = btrfs_dir_name_len(path->nodes[0], di);
|
|
u16 data_len = btrfs_dir_data_len(path->nodes[0], di);
|
|
u32 this_len = sizeof(*di) + name_len + data_len;
|
|
char *name;
|
|
|
|
name = kmalloc(name_len, GFP_NOFS);
|
|
if (!name) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
read_extent_buffer(path->nodes[0], name,
|
|
(unsigned long)(di + 1), name_len);
|
|
|
|
log_di = btrfs_lookup_xattr(NULL, log, log_path, ino,
|
|
name, name_len, 0);
|
|
btrfs_release_path(log_path);
|
|
if (!log_di) {
|
|
/* Doesn't exist in log tree, so delete it. */
|
|
btrfs_release_path(path);
|
|
di = btrfs_lookup_xattr(trans, root, path, ino,
|
|
name, name_len, -1);
|
|
kfree(name);
|
|
if (IS_ERR(di)) {
|
|
ret = PTR_ERR(di);
|
|
goto out;
|
|
}
|
|
ASSERT(di);
|
|
ret = btrfs_delete_one_dir_name(trans, root,
|
|
path, di);
|
|
if (ret)
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
search_key = key;
|
|
goto again;
|
|
}
|
|
kfree(name);
|
|
if (IS_ERR(log_di)) {
|
|
ret = PTR_ERR(log_di);
|
|
goto out;
|
|
}
|
|
cur += this_len;
|
|
di = (struct btrfs_dir_item *)((char *)di + this_len);
|
|
}
|
|
}
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
else if (ret == 0)
|
|
goto process_leaf;
|
|
out:
|
|
btrfs_free_path(log_path);
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* deletion replay happens before we copy any new directory items
|
|
* out of the log or out of backreferences from inodes. It
|
|
* scans the log to find ranges of keys that log is authoritative for,
|
|
* and then scans the directory to find items in those ranges that are
|
|
* not present in the log.
|
|
*
|
|
* Anything we don't find in the log is unlinked and removed from the
|
|
* directory.
|
|
*/
|
|
static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
u64 dirid, int del_all)
|
|
{
|
|
u64 range_start;
|
|
u64 range_end;
|
|
int key_type = BTRFS_DIR_LOG_ITEM_KEY;
|
|
int ret = 0;
|
|
struct btrfs_key dir_key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_path *log_path;
|
|
struct inode *dir;
|
|
|
|
dir_key.objectid = dirid;
|
|
dir_key.type = BTRFS_DIR_ITEM_KEY;
|
|
log_path = btrfs_alloc_path();
|
|
if (!log_path)
|
|
return -ENOMEM;
|
|
|
|
dir = read_one_inode(root, dirid);
|
|
/* it isn't an error if the inode isn't there, that can happen
|
|
* because we replay the deletes before we copy in the inode item
|
|
* from the log
|
|
*/
|
|
if (!dir) {
|
|
btrfs_free_path(log_path);
|
|
return 0;
|
|
}
|
|
again:
|
|
range_start = 0;
|
|
range_end = 0;
|
|
while (1) {
|
|
if (del_all)
|
|
range_end = (u64)-1;
|
|
else {
|
|
ret = find_dir_range(log, path, dirid, key_type,
|
|
&range_start, &range_end);
|
|
if (ret != 0)
|
|
break;
|
|
}
|
|
|
|
dir_key.offset = range_start;
|
|
while (1) {
|
|
int nritems;
|
|
ret = btrfs_search_slot(NULL, root, &dir_key, path,
|
|
0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
nritems = btrfs_header_nritems(path->nodes[0]);
|
|
if (path->slots[0] >= nritems) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret == 1)
|
|
break;
|
|
else if (ret < 0)
|
|
goto out;
|
|
}
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
path->slots[0]);
|
|
if (found_key.objectid != dirid ||
|
|
found_key.type != dir_key.type)
|
|
goto next_type;
|
|
|
|
if (found_key.offset > range_end)
|
|
break;
|
|
|
|
ret = check_item_in_log(trans, root, log, path,
|
|
log_path, dir,
|
|
&found_key);
|
|
if (ret)
|
|
goto out;
|
|
if (found_key.offset == (u64)-1)
|
|
break;
|
|
dir_key.offset = found_key.offset + 1;
|
|
}
|
|
btrfs_release_path(path);
|
|
if (range_end == (u64)-1)
|
|
break;
|
|
range_start = range_end + 1;
|
|
}
|
|
|
|
next_type:
|
|
ret = 0;
|
|
if (key_type == BTRFS_DIR_LOG_ITEM_KEY) {
|
|
key_type = BTRFS_DIR_LOG_INDEX_KEY;
|
|
dir_key.type = BTRFS_DIR_INDEX_KEY;
|
|
btrfs_release_path(path);
|
|
goto again;
|
|
}
|
|
out:
|
|
btrfs_release_path(path);
|
|
btrfs_free_path(log_path);
|
|
iput(dir);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* the process_func used to replay items from the log tree. This
|
|
* gets called in two different stages. The first stage just looks
|
|
* for inodes and makes sure they are all copied into the subvolume.
|
|
*
|
|
* The second stage copies all the other item types from the log into
|
|
* the subvolume. The two stage approach is slower, but gets rid of
|
|
* lots of complexity around inodes referencing other inodes that exist
|
|
* only in the log (references come from either directory items or inode
|
|
* back refs).
|
|
*/
|
|
static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb,
|
|
struct walk_control *wc, u64 gen, int level)
|
|
{
|
|
int nritems;
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *root = wc->replay_dest;
|
|
struct btrfs_key key;
|
|
int i;
|
|
int ret;
|
|
|
|
ret = btrfs_read_buffer(eb, gen, level, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
level = btrfs_header_level(eb);
|
|
|
|
if (level != 0)
|
|
return 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
nritems = btrfs_header_nritems(eb);
|
|
for (i = 0; i < nritems; i++) {
|
|
btrfs_item_key_to_cpu(eb, &key, i);
|
|
|
|
/* inode keys are done during the first stage */
|
|
if (key.type == BTRFS_INODE_ITEM_KEY &&
|
|
wc->stage == LOG_WALK_REPLAY_INODES) {
|
|
struct btrfs_inode_item *inode_item;
|
|
u32 mode;
|
|
|
|
inode_item = btrfs_item_ptr(eb, i,
|
|
struct btrfs_inode_item);
|
|
/*
|
|
* If we have a tmpfile (O_TMPFILE) that got fsync'ed
|
|
* and never got linked before the fsync, skip it, as
|
|
* replaying it is pointless since it would be deleted
|
|
* later. We skip logging tmpfiles, but it's always
|
|
* possible we are replaying a log created with a kernel
|
|
* that used to log tmpfiles.
|
|
*/
|
|
if (btrfs_inode_nlink(eb, inode_item) == 0) {
|
|
wc->ignore_cur_inode = true;
|
|
continue;
|
|
} else {
|
|
wc->ignore_cur_inode = false;
|
|
}
|
|
ret = replay_xattr_deletes(wc->trans, root, log,
|
|
path, key.objectid);
|
|
if (ret)
|
|
break;
|
|
mode = btrfs_inode_mode(eb, inode_item);
|
|
if (S_ISDIR(mode)) {
|
|
ret = replay_dir_deletes(wc->trans,
|
|
root, log, path, key.objectid, 0);
|
|
if (ret)
|
|
break;
|
|
}
|
|
ret = overwrite_item(wc->trans, root, path,
|
|
eb, i, &key);
|
|
if (ret)
|
|
break;
|
|
|
|
/*
|
|
* Before replaying extents, truncate the inode to its
|
|
* size. We need to do it now and not after log replay
|
|
* because before an fsync we can have prealloc extents
|
|
* added beyond the inode's i_size. If we did it after,
|
|
* through orphan cleanup for example, we would drop
|
|
* those prealloc extents just after replaying them.
|
|
*/
|
|
if (S_ISREG(mode)) {
|
|
struct btrfs_drop_extents_args drop_args = { 0 };
|
|
struct inode *inode;
|
|
u64 from;
|
|
|
|
inode = read_one_inode(root, key.objectid);
|
|
if (!inode) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
from = ALIGN(i_size_read(inode),
|
|
root->fs_info->sectorsize);
|
|
drop_args.start = from;
|
|
drop_args.end = (u64)-1;
|
|
drop_args.drop_cache = true;
|
|
ret = btrfs_drop_extents(wc->trans, root,
|
|
BTRFS_I(inode),
|
|
&drop_args);
|
|
if (!ret) {
|
|
inode_sub_bytes(inode,
|
|
drop_args.bytes_found);
|
|
/* Update the inode's nbytes. */
|
|
ret = btrfs_update_inode(wc->trans,
|
|
root, BTRFS_I(inode));
|
|
}
|
|
iput(inode);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
ret = link_to_fixup_dir(wc->trans, root,
|
|
path, key.objectid);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
if (wc->ignore_cur_inode)
|
|
continue;
|
|
|
|
if (key.type == BTRFS_DIR_INDEX_KEY &&
|
|
wc->stage == LOG_WALK_REPLAY_DIR_INDEX) {
|
|
ret = replay_one_dir_item(wc->trans, root, path,
|
|
eb, i, &key);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
if (wc->stage < LOG_WALK_REPLAY_ALL)
|
|
continue;
|
|
|
|
/* these keys are simply copied */
|
|
if (key.type == BTRFS_XATTR_ITEM_KEY) {
|
|
ret = overwrite_item(wc->trans, root, path,
|
|
eb, i, &key);
|
|
if (ret)
|
|
break;
|
|
} else if (key.type == BTRFS_INODE_REF_KEY ||
|
|
key.type == BTRFS_INODE_EXTREF_KEY) {
|
|
ret = add_inode_ref(wc->trans, root, log, path,
|
|
eb, i, &key);
|
|
if (ret && ret != -ENOENT)
|
|
break;
|
|
ret = 0;
|
|
} else if (key.type == BTRFS_EXTENT_DATA_KEY) {
|
|
ret = replay_one_extent(wc->trans, root, path,
|
|
eb, i, &key);
|
|
if (ret)
|
|
break;
|
|
} else if (key.type == BTRFS_DIR_ITEM_KEY) {
|
|
ret = replay_one_dir_item(wc->trans, root, path,
|
|
eb, i, &key);
|
|
if (ret)
|
|
break;
|
|
}
|
|
}
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Correctly adjust the reserved bytes occupied by a log tree extent buffer
|
|
*/
|
|
static void unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start)
|
|
{
|
|
struct btrfs_block_group *cache;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, start);
|
|
if (!cache) {
|
|
btrfs_err(fs_info, "unable to find block group for %llu", start);
|
|
return;
|
|
}
|
|
|
|
spin_lock(&cache->space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
cache->reserved -= fs_info->nodesize;
|
|
cache->space_info->bytes_reserved -= fs_info->nodesize;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, int *level,
|
|
struct walk_control *wc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 bytenr;
|
|
u64 ptr_gen;
|
|
struct extent_buffer *next;
|
|
struct extent_buffer *cur;
|
|
u32 blocksize;
|
|
int ret = 0;
|
|
|
|
while (*level > 0) {
|
|
struct btrfs_key first_key;
|
|
|
|
cur = path->nodes[*level];
|
|
|
|
WARN_ON(btrfs_header_level(cur) != *level);
|
|
|
|
if (path->slots[*level] >=
|
|
btrfs_header_nritems(cur))
|
|
break;
|
|
|
|
bytenr = btrfs_node_blockptr(cur, path->slots[*level]);
|
|
ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]);
|
|
btrfs_node_key_to_cpu(cur, &first_key, path->slots[*level]);
|
|
blocksize = fs_info->nodesize;
|
|
|
|
next = btrfs_find_create_tree_block(fs_info, bytenr,
|
|
btrfs_header_owner(cur),
|
|
*level - 1);
|
|
if (IS_ERR(next))
|
|
return PTR_ERR(next);
|
|
|
|
if (*level == 1) {
|
|
ret = wc->process_func(root, next, wc, ptr_gen,
|
|
*level - 1);
|
|
if (ret) {
|
|
free_extent_buffer(next);
|
|
return ret;
|
|
}
|
|
|
|
path->slots[*level]++;
|
|
if (wc->free) {
|
|
ret = btrfs_read_buffer(next, ptr_gen,
|
|
*level - 1, &first_key);
|
|
if (ret) {
|
|
free_extent_buffer(next);
|
|
return ret;
|
|
}
|
|
|
|
if (trans) {
|
|
btrfs_tree_lock(next);
|
|
btrfs_clean_tree_block(next);
|
|
btrfs_wait_tree_block_writeback(next);
|
|
btrfs_tree_unlock(next);
|
|
ret = btrfs_pin_reserved_extent(trans,
|
|
bytenr, blocksize);
|
|
if (ret) {
|
|
free_extent_buffer(next);
|
|
return ret;
|
|
}
|
|
} else {
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags))
|
|
clear_extent_buffer_dirty(next);
|
|
unaccount_log_buffer(fs_info, bytenr);
|
|
}
|
|
}
|
|
free_extent_buffer(next);
|
|
continue;
|
|
}
|
|
ret = btrfs_read_buffer(next, ptr_gen, *level - 1, &first_key);
|
|
if (ret) {
|
|
free_extent_buffer(next);
|
|
return ret;
|
|
}
|
|
|
|
if (path->nodes[*level-1])
|
|
free_extent_buffer(path->nodes[*level-1]);
|
|
path->nodes[*level-1] = next;
|
|
*level = btrfs_header_level(next);
|
|
path->slots[*level] = 0;
|
|
cond_resched();
|
|
}
|
|
path->slots[*level] = btrfs_header_nritems(path->nodes[*level]);
|
|
|
|
cond_resched();
|
|
return 0;
|
|
}
|
|
|
|
static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path, int *level,
|
|
struct walk_control *wc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int i;
|
|
int slot;
|
|
int ret;
|
|
|
|
for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) {
|
|
slot = path->slots[i];
|
|
if (slot + 1 < btrfs_header_nritems(path->nodes[i])) {
|
|
path->slots[i]++;
|
|
*level = i;
|
|
WARN_ON(*level == 0);
|
|
return 0;
|
|
} else {
|
|
ret = wc->process_func(root, path->nodes[*level], wc,
|
|
btrfs_header_generation(path->nodes[*level]),
|
|
*level);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (wc->free) {
|
|
struct extent_buffer *next;
|
|
|
|
next = path->nodes[*level];
|
|
|
|
if (trans) {
|
|
btrfs_tree_lock(next);
|
|
btrfs_clean_tree_block(next);
|
|
btrfs_wait_tree_block_writeback(next);
|
|
btrfs_tree_unlock(next);
|
|
ret = btrfs_pin_reserved_extent(trans,
|
|
path->nodes[*level]->start,
|
|
path->nodes[*level]->len);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags))
|
|
clear_extent_buffer_dirty(next);
|
|
|
|
unaccount_log_buffer(fs_info,
|
|
path->nodes[*level]->start);
|
|
}
|
|
}
|
|
free_extent_buffer(path->nodes[*level]);
|
|
path->nodes[*level] = NULL;
|
|
*level = i + 1;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* drop the reference count on the tree rooted at 'snap'. This traverses
|
|
* the tree freeing any blocks that have a ref count of zero after being
|
|
* decremented.
|
|
*/
|
|
static int walk_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *log, struct walk_control *wc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = log->fs_info;
|
|
int ret = 0;
|
|
int wret;
|
|
int level;
|
|
struct btrfs_path *path;
|
|
int orig_level;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
level = btrfs_header_level(log->node);
|
|
orig_level = level;
|
|
path->nodes[level] = log->node;
|
|
atomic_inc(&log->node->refs);
|
|
path->slots[level] = 0;
|
|
|
|
while (1) {
|
|
wret = walk_down_log_tree(trans, log, path, &level, wc);
|
|
if (wret > 0)
|
|
break;
|
|
if (wret < 0) {
|
|
ret = wret;
|
|
goto out;
|
|
}
|
|
|
|
wret = walk_up_log_tree(trans, log, path, &level, wc);
|
|
if (wret > 0)
|
|
break;
|
|
if (wret < 0) {
|
|
ret = wret;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* was the root node processed? if not, catch it here */
|
|
if (path->nodes[orig_level]) {
|
|
ret = wc->process_func(log, path->nodes[orig_level], wc,
|
|
btrfs_header_generation(path->nodes[orig_level]),
|
|
orig_level);
|
|
if (ret)
|
|
goto out;
|
|
if (wc->free) {
|
|
struct extent_buffer *next;
|
|
|
|
next = path->nodes[orig_level];
|
|
|
|
if (trans) {
|
|
btrfs_tree_lock(next);
|
|
btrfs_clean_tree_block(next);
|
|
btrfs_wait_tree_block_writeback(next);
|
|
btrfs_tree_unlock(next);
|
|
ret = btrfs_pin_reserved_extent(trans,
|
|
next->start, next->len);
|
|
if (ret)
|
|
goto out;
|
|
} else {
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags))
|
|
clear_extent_buffer_dirty(next);
|
|
unaccount_log_buffer(fs_info, next->start);
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper function to update the item for a given subvolumes log root
|
|
* in the tree of log roots
|
|
*/
|
|
static int update_log_root(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *log,
|
|
struct btrfs_root_item *root_item)
|
|
{
|
|
struct btrfs_fs_info *fs_info = log->fs_info;
|
|
int ret;
|
|
|
|
if (log->log_transid == 1) {
|
|
/* insert root item on the first sync */
|
|
ret = btrfs_insert_root(trans, fs_info->log_root_tree,
|
|
&log->root_key, root_item);
|
|
} else {
|
|
ret = btrfs_update_root(trans, fs_info->log_root_tree,
|
|
&log->root_key, root_item);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void wait_log_commit(struct btrfs_root *root, int transid)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
int index = transid % 2;
|
|
|
|
/*
|
|
* we only allow two pending log transactions at a time,
|
|
* so we know that if ours is more than 2 older than the
|
|
* current transaction, we're done
|
|
*/
|
|
for (;;) {
|
|
prepare_to_wait(&root->log_commit_wait[index],
|
|
&wait, TASK_UNINTERRUPTIBLE);
|
|
|
|
if (!(root->log_transid_committed < transid &&
|
|
atomic_read(&root->log_commit[index])))
|
|
break;
|
|
|
|
mutex_unlock(&root->log_mutex);
|
|
schedule();
|
|
mutex_lock(&root->log_mutex);
|
|
}
|
|
finish_wait(&root->log_commit_wait[index], &wait);
|
|
}
|
|
|
|
static void wait_for_writer(struct btrfs_root *root)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
for (;;) {
|
|
prepare_to_wait(&root->log_writer_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (!atomic_read(&root->log_writers))
|
|
break;
|
|
|
|
mutex_unlock(&root->log_mutex);
|
|
schedule();
|
|
mutex_lock(&root->log_mutex);
|
|
}
|
|
finish_wait(&root->log_writer_wait, &wait);
|
|
}
|
|
|
|
static inline void btrfs_remove_log_ctx(struct btrfs_root *root,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
if (!ctx)
|
|
return;
|
|
|
|
mutex_lock(&root->log_mutex);
|
|
list_del_init(&ctx->list);
|
|
mutex_unlock(&root->log_mutex);
|
|
}
|
|
|
|
/*
|
|
* Invoked in log mutex context, or be sure there is no other task which
|
|
* can access the list.
|
|
*/
|
|
static inline void btrfs_remove_all_log_ctxs(struct btrfs_root *root,
|
|
int index, int error)
|
|
{
|
|
struct btrfs_log_ctx *ctx;
|
|
struct btrfs_log_ctx *safe;
|
|
|
|
list_for_each_entry_safe(ctx, safe, &root->log_ctxs[index], list) {
|
|
list_del_init(&ctx->list);
|
|
ctx->log_ret = error;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&root->log_ctxs[index]);
|
|
}
|
|
|
|
/*
|
|
* btrfs_sync_log does sends a given tree log down to the disk and
|
|
* updates the super blocks to record it. When this call is done,
|
|
* you know that any inodes previously logged are safely on disk only
|
|
* if it returns 0.
|
|
*
|
|
* Any other return value means you need to call btrfs_commit_transaction.
|
|
* Some of the edge cases for fsyncing directories that have had unlinks
|
|
* or renames done in the past mean that sometimes the only safe
|
|
* fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN,
|
|
* that has happened.
|
|
*/
|
|
int btrfs_sync_log(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_log_ctx *ctx)
|
|
{
|
|
int index1;
|
|
int index2;
|
|
int mark;
|
|
int ret;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *log = root->log_root;
|
|
struct btrfs_root *log_root_tree = fs_info->log_root_tree;
|
|
struct btrfs_root_item new_root_item;
|
|
int log_transid = 0;
|
|
struct btrfs_log_ctx root_log_ctx;
|
|
struct blk_plug plug;
|
|
u64 log_root_start;
|
|
u64 log_root_level;
|
|
|
|
mutex_lock(&root->log_mutex);
|
|
log_transid = ctx->log_transid;
|
|
if (root->log_transid_committed >= log_transid) {
|
|
mutex_unlock(&root->log_mutex);
|
|
return ctx->log_ret;
|
|
}
|
|
|
|
index1 = log_transid % 2;
|
|
if (atomic_read(&root->log_commit[index1])) {
|
|
wait_log_commit(root, log_transid);
|
|
mutex_unlock(&root->log_mutex);
|
|
return ctx->log_ret;
|
|
}
|
|
ASSERT(log_transid == root->log_transid);
|
|
atomic_set(&root->log_commit[index1], 1);
|
|
|
|
/* wait for previous tree log sync to complete */
|
|
if (atomic_read(&root->log_commit[(index1 + 1) % 2]))
|
|
wait_log_commit(root, log_transid - 1);
|
|
|
|
while (1) {
|
|
int batch = atomic_read(&root->log_batch);
|
|
/* when we're on an ssd, just kick the log commit out */
|
|
if (!btrfs_test_opt(fs_info, SSD) &&
|
|
test_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state)) {
|
|
mutex_unlock(&root->log_mutex);
|
|
schedule_timeout_uninterruptible(1);
|
|
mutex_lock(&root->log_mutex);
|
|
}
|
|
wait_for_writer(root);
|
|
if (batch == atomic_read(&root->log_batch))
|
|
break;
|
|
}
|
|
|
|
/* bail out if we need to do a full commit */
|
|
if (btrfs_need_log_full_commit(trans)) {
|
|
ret = -EAGAIN;
|
|
mutex_unlock(&root->log_mutex);
|
|
goto out;
|
|
}
|
|
|
|
if (log_transid % 2 == 0)
|
|
mark = EXTENT_DIRTY;
|
|
else
|
|
mark = EXTENT_NEW;
|
|
|
|
/* we start IO on all the marked extents here, but we don't actually
|
|
* wait for them until later.
|
|
*/
|
|
blk_start_plug(&plug);
|
|
ret = btrfs_write_marked_extents(fs_info, &log->dirty_log_pages, mark);
|
|
if (ret) {
|
|
blk_finish_plug(&plug);
|
|
btrfs_abort_transaction(trans, ret);
|
|
btrfs_set_log_full_commit(trans);
|
|
mutex_unlock(&root->log_mutex);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We _must_ update under the root->log_mutex in order to make sure we
|
|
* have a consistent view of the log root we are trying to commit at
|
|
* this moment.
|
|
*
|
|
* We _must_ copy this into a local copy, because we are not holding the
|
|
* log_root_tree->log_mutex yet. This is important because when we
|
|
* commit the log_root_tree we must have a consistent view of the
|
|
* log_root_tree when we update the super block to point at the
|
|
* log_root_tree bytenr. If we update the log_root_tree here we'll race
|
|
* with the commit and possibly point at the new block which we may not
|
|
* have written out.
|
|
*/
|
|
btrfs_set_root_node(&log->root_item, log->node);
|
|
memcpy(&new_root_item, &log->root_item, sizeof(new_root_item));
|
|
|
|
root->log_transid++;
|
|
log->log_transid = root->log_transid;
|
|
root->log_start_pid = 0;
|
|
/*
|
|
* IO has been started, blocks of the log tree have WRITTEN flag set
|
|
* in their headers. new modifications of the log will be written to
|
|
* new positions. so it's safe to allow log writers to go in.
|
|
*/
|
|
mutex_unlock(&root->log_mutex);
|
|
|
|
btrfs_init_log_ctx(&root_log_ctx, NULL);
|
|
|
|
mutex_lock(&log_root_tree->log_mutex);
|
|
|
|
index2 = log_root_tree->log_transid % 2;
|
|
list_add_tail(&root_log_ctx.list, &log_root_tree->log_ctxs[index2]);
|
|
root_log_ctx.log_transid = log_root_tree->log_transid;
|
|
|
|
/*
|
|
* Now we are safe to update the log_root_tree because we're under the
|
|
* log_mutex, and we're a current writer so we're holding the commit
|
|
* open until we drop the log_mutex.
|
|
*/
|
|
ret = update_log_root(trans, log, &new_root_item);
|
|
if (ret) {
|
|
if (!list_empty(&root_log_ctx.list))
|
|
list_del_init(&root_log_ctx.list);
|
|
|
|
blk_finish_plug(&plug);
|
|
btrfs_set_log_full_commit(trans);
|
|
|
|
if (ret != -ENOSPC) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
goto out;
|
|
}
|
|
btrfs_wait_tree_log_extents(log, mark);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
if (log_root_tree->log_transid_committed >= root_log_ctx.log_transid) {
|
|
blk_finish_plug(&plug);
|
|
list_del_init(&root_log_ctx.list);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
ret = root_log_ctx.log_ret;
|
|
goto out;
|
|
}
|
|
|
|
index2 = root_log_ctx.log_transid % 2;
|
|
if (atomic_read(&log_root_tree->log_commit[index2])) {
|
|
blk_finish_plug(&plug);
|
|
ret = btrfs_wait_tree_log_extents(log, mark);
|
|
wait_log_commit(log_root_tree,
|
|
root_log_ctx.log_transid);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
if (!ret)
|
|
ret = root_log_ctx.log_ret;
|
|
goto out;
|
|
}
|
|
ASSERT(root_log_ctx.log_transid == log_root_tree->log_transid);
|
|
atomic_set(&log_root_tree->log_commit[index2], 1);
|
|
|
|
if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) {
|
|
wait_log_commit(log_root_tree,
|
|
root_log_ctx.log_transid - 1);
|
|
}
|
|
|
|
/*
|
|
* now that we've moved on to the tree of log tree roots,
|
|
* check the full commit flag again
|
|
*/
|
|
if (btrfs_need_log_full_commit(trans)) {
|
|
blk_finish_plug(&plug);
|
|
btrfs_wait_tree_log_extents(log, mark);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
ret = -EAGAIN;
|
|
goto out_wake_log_root;
|
|
}
|
|
|
|
ret = btrfs_write_marked_extents(fs_info,
|
|
&log_root_tree->dirty_log_pages,
|
|
EXTENT_DIRTY | EXTENT_NEW);
|
|
blk_finish_plug(&plug);
|
|
if (ret) {
|
|
btrfs_set_log_full_commit(trans);
|
|
btrfs_abort_transaction(trans, ret);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
goto out_wake_log_root;
|
|
}
|
|
ret = btrfs_wait_tree_log_extents(log, mark);
|
|
if (!ret)
|
|
ret = btrfs_wait_tree_log_extents(log_root_tree,
|
|
EXTENT_NEW | EXTENT_DIRTY);
|
|
if (ret) {
|
|
btrfs_set_log_full_commit(trans);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
goto out_wake_log_root;
|
|
}
|
|
|
|
log_root_start = log_root_tree->node->start;
|
|
log_root_level = btrfs_header_level(log_root_tree->node);
|
|
log_root_tree->log_transid++;
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
|
|
/*
|
|
* Here we are guaranteed that nobody is going to write the superblock
|
|
* for the current transaction before us and that neither we do write
|
|
* our superblock before the previous transaction finishes its commit
|
|
* and writes its superblock, because:
|
|
*
|
|
* 1) We are holding a handle on the current transaction, so no body
|
|
* can commit it until we release the handle;
|
|
*
|
|
* 2) Before writing our superblock we acquire the tree_log_mutex, so
|
|
* if the previous transaction is still committing, and hasn't yet
|
|
* written its superblock, we wait for it to do it, because a
|
|
* transaction commit acquires the tree_log_mutex when the commit
|
|
* begins and releases it only after writing its superblock.
|
|
*/
|
|
mutex_lock(&fs_info->tree_log_mutex);
|
|
btrfs_set_super_log_root(fs_info->super_for_commit, log_root_start);
|
|
btrfs_set_super_log_root_level(fs_info->super_for_commit, log_root_level);
|
|
ret = write_all_supers(fs_info, 1);
|
|
mutex_unlock(&fs_info->tree_log_mutex);
|
|
if (ret) {
|
|
btrfs_set_log_full_commit(trans);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_wake_log_root;
|
|
}
|
|
|
|
mutex_lock(&root->log_mutex);
|
|
if (root->last_log_commit < log_transid)
|
|
root->last_log_commit = log_transid;
|
|
mutex_unlock(&root->log_mutex);
|
|
|
|
out_wake_log_root:
|
|
mutex_lock(&log_root_tree->log_mutex);
|
|
btrfs_remove_all_log_ctxs(log_root_tree, index2, ret);
|
|
|
|
log_root_tree->log_transid_committed++;
|
|
atomic_set(&log_root_tree->log_commit[index2], 0);
|
|
mutex_unlock(&log_root_tree->log_mutex);
|
|
|
|
/*
|
|
* The barrier before waitqueue_active (in cond_wake_up) is needed so
|
|
* all the updates above are seen by the woken threads. It might not be
|
|
* necessary, but proving that seems to be hard.
|
|
*/
|
|
cond_wake_up(&log_root_tree->log_commit_wait[index2]);
|
|
out:
|
|
mutex_lock(&root->log_mutex);
|
|
btrfs_remove_all_log_ctxs(root, index1, ret);
|
|
root->log_transid_committed++;
|
|
atomic_set(&root->log_commit[index1], 0);
|
|
mutex_unlock(&root->log_mutex);
|
|
|
|
/*
|
|
* The barrier before waitqueue_active (in cond_wake_up) is needed so
|
|
* all the updates above are seen by the woken threads. It might not be
|
|
* necessary, but proving that seems to be hard.
|
|
*/
|
|
cond_wake_up(&root->log_commit_wait[index1]);
|
|
return ret;
|
|
}
|
|
|
|
static void free_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *log)
|
|
{
|
|
int ret;
|
|
struct walk_control wc = {
|
|
.free = 1,
|
|
.process_func = process_one_buffer
|
|
};
|
|
|
|
ret = walk_log_tree(trans, log, &wc);
|
|
if (ret) {
|
|
if (trans)
|
|
btrfs_abort_transaction(trans, ret);
|
|
else
|
|
btrfs_handle_fs_error(log->fs_info, ret, NULL);
|
|
}
|
|
|
|
clear_extent_bits(&log->dirty_log_pages, 0, (u64)-1,
|
|
EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT);
|
|
extent_io_tree_release(&log->log_csum_range);
|
|
btrfs_put_root(log);
|
|
}
|
|
|
|
/*
|
|
* free all the extents used by the tree log. This should be called
|
|
* at commit time of the full transaction
|
|
*/
|
|
int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root)
|
|
{
|
|
if (root->log_root) {
|
|
free_log_tree(trans, root->log_root);
|
|
root->log_root = NULL;
|
|
clear_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (fs_info->log_root_tree) {
|
|
free_log_tree(trans, fs_info->log_root_tree);
|
|
fs_info->log_root_tree = NULL;
|
|
clear_bit(BTRFS_ROOT_HAS_LOG_TREE, &fs_info->tree_root->state);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if an inode was logged in the current transaction. We can't always rely
|
|
* on an inode's logged_trans value, because it's an in-memory only field and
|
|
* therefore not persisted. This means that its value is lost if the inode gets
|
|
* evicted and loaded again from disk (in which case it has a value of 0, and
|
|
* certainly it is smaller then any possible transaction ID), when that happens
|
|
* the full_sync flag is set in the inode's runtime flags, so on that case we
|
|
* assume eviction happened and ignore the logged_trans value, assuming the
|
|
* worst case, that the inode was logged before in the current transaction.
|
|
*/
|
|
static bool inode_logged(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
if (inode->logged_trans == trans->transid)
|
|
return true;
|
|
|
|
if (inode->last_trans == trans->transid &&
|
|
test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags) &&
|
|
!test_bit(BTRFS_FS_LOG_RECOVERING, &trans->fs_info->flags))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* If both a file and directory are logged, and unlinks or renames are
|
|
* mixed in, we have a few interesting corners:
|
|
*
|
|
* create file X in dir Y
|
|
* link file X to X.link in dir Y
|
|
* fsync file X
|
|
* unlink file X but leave X.link
|
|
* fsync dir Y
|
|
*
|
|
* After a crash we would expect only X.link to exist. But file X
|
|
* didn't get fsync'd again so the log has back refs for X and X.link.
|
|
*
|
|
* We solve this by removing directory entries and inode backrefs from the
|
|
* log when a file that was logged in the current transaction is
|
|
* unlinked. Any later fsync will include the updated log entries, and
|
|
* we'll be able to reconstruct the proper directory items from backrefs.
|
|
*
|
|
* This optimizations allows us to avoid relogging the entire inode
|
|
* or the entire directory.
|
|
*/
|
|
int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
const char *name, int name_len,
|
|
struct btrfs_inode *dir, u64 index)
|
|
{
|
|
struct btrfs_root *log;
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
int err = 0;
|
|
int bytes_del = 0;
|
|
u64 dir_ino = btrfs_ino(dir);
|
|
|
|
if (!inode_logged(trans, dir))
|
|
return 0;
|
|
|
|
ret = join_running_log_trans(root);
|
|
if (ret)
|
|
return 0;
|
|
|
|
mutex_lock(&dir->log_mutex);
|
|
|
|
log = root->log_root;
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
err = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
di = btrfs_lookup_dir_item(trans, log, path, dir_ino,
|
|
name, name_len, -1);
|
|
if (IS_ERR(di)) {
|
|
err = PTR_ERR(di);
|
|
goto fail;
|
|
}
|
|
if (di) {
|
|
ret = btrfs_delete_one_dir_name(trans, log, path, di);
|
|
bytes_del += name_len;
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
}
|
|
btrfs_release_path(path);
|
|
di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino,
|
|
index, name, name_len, -1);
|
|
if (IS_ERR(di)) {
|
|
err = PTR_ERR(di);
|
|
goto fail;
|
|
}
|
|
if (di) {
|
|
ret = btrfs_delete_one_dir_name(trans, log, path, di);
|
|
bytes_del += name_len;
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* update the directory size in the log to reflect the names
|
|
* we have removed
|
|
*/
|
|
if (bytes_del) {
|
|
struct btrfs_key key;
|
|
|
|
key.objectid = dir_ino;
|
|
key.offset = 0;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
btrfs_release_path(path);
|
|
|
|
ret = btrfs_search_slot(trans, log, &key, path, 0, 1);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
if (ret == 0) {
|
|
struct btrfs_inode_item *item;
|
|
u64 i_size;
|
|
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
i_size = btrfs_inode_size(path->nodes[0], item);
|
|
if (i_size > bytes_del)
|
|
i_size -= bytes_del;
|
|
else
|
|
i_size = 0;
|
|
btrfs_set_inode_size(path->nodes[0], item, i_size);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
} else
|
|
ret = 0;
|
|
btrfs_release_path(path);
|
|
}
|
|
fail:
|
|
btrfs_free_path(path);
|
|
out_unlock:
|
|
mutex_unlock(&dir->log_mutex);
|
|
if (err == -ENOSPC) {
|
|
btrfs_set_log_full_commit(trans);
|
|
err = 0;
|
|
} else if (err < 0 && err != -ENOENT) {
|
|
/* ENOENT can be returned if the entry hasn't been fsynced yet */
|
|
btrfs_abort_transaction(trans, err);
|
|
}
|
|
|
|
btrfs_end_log_trans(root);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* see comments for btrfs_del_dir_entries_in_log */
|
|
int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
const char *name, int name_len,
|
|
struct btrfs_inode *inode, u64 dirid)
|
|
{
|
|
struct btrfs_root *log;
|
|
u64 index;
|
|
int ret;
|
|
|
|
if (!inode_logged(trans, inode))
|
|
return 0;
|
|
|
|
ret = join_running_log_trans(root);
|
|
if (ret)
|
|
return 0;
|
|
log = root->log_root;
|
|
mutex_lock(&inode->log_mutex);
|
|
|
|
ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode),
|
|
dirid, &index);
|
|
mutex_unlock(&inode->log_mutex);
|
|
if (ret == -ENOSPC) {
|
|
btrfs_set_log_full_commit(trans);
|
|
ret = 0;
|
|
} else if (ret < 0 && ret != -ENOENT)
|
|
btrfs_abort_transaction(trans, ret);
|
|
btrfs_end_log_trans(root);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* creates a range item in the log for 'dirid'. first_offset and
|
|
* last_offset tell us which parts of the key space the log should
|
|
* be considered authoritative for.
|
|
*/
|
|
static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
int key_type, u64 dirid,
|
|
u64 first_offset, u64 last_offset)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
struct btrfs_dir_log_item *item;
|
|
|
|
key.objectid = dirid;
|
|
key.offset = first_offset;
|
|
if (key_type == BTRFS_DIR_ITEM_KEY)
|
|
key.type = BTRFS_DIR_LOG_ITEM_KEY;
|
|
else
|
|
key.type = BTRFS_DIR_LOG_INDEX_KEY;
|
|
ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item));
|
|
if (ret)
|
|
return ret;
|
|
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_dir_log_item);
|
|
btrfs_set_dir_log_end(path->nodes[0], item, last_offset);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* log all the items included in the current transaction for a given
|
|
* directory. This also creates the range items in the log tree required
|
|
* to replay anything deleted before the fsync
|
|
*/
|
|
static noinline int log_dir_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_inode *inode,
|
|
struct btrfs_path *path,
|
|
struct btrfs_path *dst_path, int key_type,
|
|
struct btrfs_log_ctx *ctx,
|
|
u64 min_offset, u64 *last_offset_ret)
|
|
{
|
|
struct btrfs_key min_key;
|
|
struct btrfs_root *log = root->log_root;
|
|
struct extent_buffer *src;
|
|
int err = 0;
|
|
int ret;
|
|
int i;
|
|
int nritems;
|
|
u64 first_offset = min_offset;
|
|
u64 last_offset = (u64)-1;
|
|
u64 ino = btrfs_ino(inode);
|
|
|
|
log = root->log_root;
|
|
|
|
min_key.objectid = ino;
|
|
min_key.type = key_type;
|
|
min_key.offset = min_offset;
|
|
|
|
ret = btrfs_search_forward(root, &min_key, path, trans->transid);
|
|
|
|
/*
|
|
* we didn't find anything from this transaction, see if there
|
|
* is anything at all
|
|
*/
|
|
if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) {
|
|
min_key.objectid = ino;
|
|
min_key.type = key_type;
|
|
min_key.offset = (u64)-1;
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0);
|
|
if (ret < 0) {
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
ret = btrfs_previous_item(root, path, ino, key_type);
|
|
|
|
/* if ret == 0 there are items for this type,
|
|
* create a range to tell us the last key of this type.
|
|
* otherwise, there are no items in this directory after
|
|
* *min_offset, and we create a range to indicate that.
|
|
*/
|
|
if (ret == 0) {
|
|
struct btrfs_key tmp;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &tmp,
|
|
path->slots[0]);
|
|
if (key_type == tmp.type)
|
|
first_offset = max(min_offset, tmp.offset) + 1;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* go backward to find any previous key */
|
|
ret = btrfs_previous_item(root, path, ino, key_type);
|
|
if (ret == 0) {
|
|
struct btrfs_key tmp;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]);
|
|
if (key_type == tmp.type) {
|
|
first_offset = tmp.offset;
|
|
ret = overwrite_item(trans, log, dst_path,
|
|
path->nodes[0], path->slots[0],
|
|
&tmp);
|
|
if (ret) {
|
|
err = ret;
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* Find the first key from this transaction again. See the note for
|
|
* log_new_dir_dentries, if we're logging a directory recursively we
|
|
* won't be holding its i_mutex, which means we can modify the directory
|
|
* while we're logging it. If we remove an entry between our first
|
|
* search and this search we'll not find the key again and can just
|
|
* bail.
|
|
*/
|
|
search:
|
|
ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0);
|
|
if (ret != 0)
|
|
goto done;
|
|
|
|
/*
|
|
* we have a block from this transaction, log every item in it
|
|
* from our directory
|
|
*/
|
|
while (1) {
|
|
struct btrfs_key tmp;
|
|
src = path->nodes[0];
|
|
nritems = btrfs_header_nritems(src);
|
|
for (i = path->slots[0]; i < nritems; i++) {
|
|
struct btrfs_dir_item *di;
|
|
|
|
btrfs_item_key_to_cpu(src, &min_key, i);
|
|
|
|
if (min_key.objectid != ino || min_key.type != key_type)
|
|
goto done;
|
|
|
|
if (need_resched()) {
|
|
btrfs_release_path(path);
|
|
cond_resched();
|
|
goto search;
|
|
}
|
|
|
|
ret = overwrite_item(trans, log, dst_path, src, i,
|
|
&min_key);
|
|
if (ret) {
|
|
err = ret;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* We must make sure that when we log a directory entry,
|
|
* the corresponding inode, after log replay, has a
|
|
* matching link count. For example:
|
|
*
|
|
* touch foo
|
|
* mkdir mydir
|
|
* sync
|
|
* ln foo mydir/bar
|
|
* xfs_io -c "fsync" mydir
|
|
* <crash>
|
|
* <mount fs and log replay>
|
|
*
|
|
* Would result in a fsync log that when replayed, our
|
|
* file inode would have a link count of 1, but we get
|
|
* two directory entries pointing to the same inode.
|
|
* After removing one of the names, it would not be
|
|
* possible to remove the other name, which resulted
|
|
* always in stale file handle errors, and would not
|
|
* be possible to rmdir the parent directory, since
|
|
* its i_size could never decrement to the value
|
|
* BTRFS_EMPTY_DIR_SIZE, resulting in -ENOTEMPTY errors.
|
|
*/
|
|
di = btrfs_item_ptr(src, i, struct btrfs_dir_item);
|
|
btrfs_dir_item_key_to_cpu(src, di, &tmp);
|
|
if (ctx &&
|
|
(btrfs_dir_transid(src, di) == trans->transid ||
|
|
btrfs_dir_type(src, di) == BTRFS_FT_DIR) &&
|
|
tmp.type != BTRFS_ROOT_ITEM_KEY)
|
|
ctx->log_new_dentries = true;
|
|
}
|
|
path->slots[0] = nritems;
|
|
|
|
/*
|
|
* look ahead to the next item and see if it is also
|
|
* from this directory and from this transaction
|
|
*/
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret) {
|
|
if (ret == 1)
|
|
last_offset = (u64)-1;
|
|
else
|
|
err = ret;
|
|
goto done;
|
|
}
|
|
btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]);
|
|
if (tmp.objectid != ino || tmp.type != key_type) {
|
|
last_offset = (u64)-1;
|
|
goto done;
|
|
}
|
|
if (btrfs_header_generation(path->nodes[0]) != trans->transid) {
|
|
ret = overwrite_item(trans, log, dst_path,
|
|
path->nodes[0], path->slots[0],
|
|
&tmp);
|
|
if (ret)
|
|
err = ret;
|
|
else
|
|
last_offset = tmp.offset;
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
btrfs_release_path(path);
|
|
btrfs_release_path(dst_path);
|
|
|
|
if (err == 0) {
|
|
*last_offset_ret = last_offset;
|
|
/*
|
|
* insert the log range keys to indicate where the log
|
|
* is valid
|
|
*/
|
|
ret = insert_dir_log_key(trans, log, path, key_type,
|
|
ino, first_offset, last_offset);
|
|
if (ret)
|
|
err = ret;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* logging directories is very similar to logging inodes, We find all the items
|
|
* from the current transaction and write them to the log.
|
|
*
|
|
* The recovery code scans the directory in the subvolume, and if it finds a
|
|
* key in the range logged that is not present in the log tree, then it means
|
|
* that dir entry was unlinked during the transaction.
|
|
*
|
|
* In order for that scan to work, we must include one key smaller than
|
|
* the smallest logged by this transaction and one key larger than the largest
|
|
* key logged by this transaction.
|
|
*/
|
|
static noinline int log_directory_changes(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_inode *inode,
|
|
struct btrfs_path *path,
|
|
struct btrfs_path *dst_path,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
u64 min_key;
|
|
u64 max_key;
|
|
int ret;
|
|
int key_type = BTRFS_DIR_ITEM_KEY;
|
|
|
|
again:
|
|
min_key = 0;
|
|
max_key = 0;
|
|
while (1) {
|
|
ret = log_dir_items(trans, root, inode, path, dst_path, key_type,
|
|
ctx, min_key, &max_key);
|
|
if (ret)
|
|
return ret;
|
|
if (max_key == (u64)-1)
|
|
break;
|
|
min_key = max_key + 1;
|
|
}
|
|
|
|
if (key_type == BTRFS_DIR_ITEM_KEY) {
|
|
key_type = BTRFS_DIR_INDEX_KEY;
|
|
goto again;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* a helper function to drop items from the log before we relog an
|
|
* inode. max_key_type indicates the highest item type to remove.
|
|
* This cannot be run for file data extents because it does not
|
|
* free the extents they point to.
|
|
*/
|
|
static int drop_objectid_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *log,
|
|
struct btrfs_path *path,
|
|
u64 objectid, int max_key_type)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
int start_slot;
|
|
|
|
key.objectid = objectid;
|
|
key.type = max_key_type;
|
|
key.offset = (u64)-1;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(trans, log, &key, path, -1, 1);
|
|
BUG_ON(ret == 0); /* Logic error */
|
|
if (ret < 0)
|
|
break;
|
|
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
path->slots[0]);
|
|
|
|
if (found_key.objectid != objectid)
|
|
break;
|
|
|
|
found_key.offset = 0;
|
|
found_key.type = 0;
|
|
ret = btrfs_bin_search(path->nodes[0], &found_key, &start_slot);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = btrfs_del_items(trans, log, path, start_slot,
|
|
path->slots[0] - start_slot + 1);
|
|
/*
|
|
* If start slot isn't 0 then we don't need to re-search, we've
|
|
* found the last guy with the objectid in this tree.
|
|
*/
|
|
if (ret || start_slot != 0)
|
|
break;
|
|
btrfs_release_path(path);
|
|
}
|
|
btrfs_release_path(path);
|
|
if (ret > 0)
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
static void fill_inode_item(struct btrfs_trans_handle *trans,
|
|
struct extent_buffer *leaf,
|
|
struct btrfs_inode_item *item,
|
|
struct inode *inode, int log_inode_only,
|
|
u64 logged_isize)
|
|
{
|
|
struct btrfs_map_token token;
|
|
|
|
btrfs_init_map_token(&token, leaf);
|
|
|
|
if (log_inode_only) {
|
|
/* set the generation to zero so the recover code
|
|
* can tell the difference between an logging
|
|
* just to say 'this inode exists' and a logging
|
|
* to say 'update this inode with these values'
|
|
*/
|
|
btrfs_set_token_inode_generation(&token, item, 0);
|
|
btrfs_set_token_inode_size(&token, item, logged_isize);
|
|
} else {
|
|
btrfs_set_token_inode_generation(&token, item,
|
|
BTRFS_I(inode)->generation);
|
|
btrfs_set_token_inode_size(&token, item, inode->i_size);
|
|
}
|
|
|
|
btrfs_set_token_inode_uid(&token, item, i_uid_read(inode));
|
|
btrfs_set_token_inode_gid(&token, item, i_gid_read(inode));
|
|
btrfs_set_token_inode_mode(&token, item, inode->i_mode);
|
|
btrfs_set_token_inode_nlink(&token, item, inode->i_nlink);
|
|
|
|
btrfs_set_token_timespec_sec(&token, &item->atime,
|
|
inode->i_atime.tv_sec);
|
|
btrfs_set_token_timespec_nsec(&token, &item->atime,
|
|
inode->i_atime.tv_nsec);
|
|
|
|
btrfs_set_token_timespec_sec(&token, &item->mtime,
|
|
inode->i_mtime.tv_sec);
|
|
btrfs_set_token_timespec_nsec(&token, &item->mtime,
|
|
inode->i_mtime.tv_nsec);
|
|
|
|
btrfs_set_token_timespec_sec(&token, &item->ctime,
|
|
inode->i_ctime.tv_sec);
|
|
btrfs_set_token_timespec_nsec(&token, &item->ctime,
|
|
inode->i_ctime.tv_nsec);
|
|
|
|
btrfs_set_token_inode_nbytes(&token, item, inode_get_bytes(inode));
|
|
|
|
btrfs_set_token_inode_sequence(&token, item, inode_peek_iversion(inode));
|
|
btrfs_set_token_inode_transid(&token, item, trans->transid);
|
|
btrfs_set_token_inode_rdev(&token, item, inode->i_rdev);
|
|
btrfs_set_token_inode_flags(&token, item, BTRFS_I(inode)->flags);
|
|
btrfs_set_token_inode_block_group(&token, item, 0);
|
|
}
|
|
|
|
static int log_inode_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *log, struct btrfs_path *path,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_inode_item *inode_item;
|
|
int ret;
|
|
|
|
ret = btrfs_insert_empty_item(trans, log, path,
|
|
&inode->location, sizeof(*inode_item));
|
|
if (ret && ret != -EEXIST)
|
|
return ret;
|
|
inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
fill_inode_item(trans, path->nodes[0], inode_item, &inode->vfs_inode,
|
|
0, 0);
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
|
|
static int log_csums(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_root *log_root,
|
|
struct btrfs_ordered_sum *sums)
|
|
{
|
|
const u64 lock_end = sums->bytenr + sums->len - 1;
|
|
struct extent_state *cached_state = NULL;
|
|
int ret;
|
|
|
|
/*
|
|
* If this inode was not used for reflink operations in the current
|
|
* transaction with new extents, then do the fast path, no need to
|
|
* worry about logging checksum items with overlapping ranges.
|
|
*/
|
|
if (inode->last_reflink_trans < trans->transid)
|
|
return btrfs_csum_file_blocks(trans, log_root, sums);
|
|
|
|
/*
|
|
* Serialize logging for checksums. This is to avoid racing with the
|
|
* same checksum being logged by another task that is logging another
|
|
* file which happens to refer to the same extent as well. Such races
|
|
* can leave checksum items in the log with overlapping ranges.
|
|
*/
|
|
ret = lock_extent_bits(&log_root->log_csum_range, sums->bytenr,
|
|
lock_end, &cached_state);
|
|
if (ret)
|
|
return ret;
|
|
/*
|
|
* Due to extent cloning, we might have logged a csum item that covers a
|
|
* subrange of a cloned extent, and later we can end up logging a csum
|
|
* item for a larger subrange of the same extent or the entire range.
|
|
* This would leave csum items in the log tree that cover the same range
|
|
* and break the searches for checksums in the log tree, resulting in
|
|
* some checksums missing in the fs/subvolume tree. So just delete (or
|
|
* trim and adjust) any existing csum items in the log for this range.
|
|
*/
|
|
ret = btrfs_del_csums(trans, log_root, sums->bytenr, sums->len);
|
|
if (!ret)
|
|
ret = btrfs_csum_file_blocks(trans, log_root, sums);
|
|
|
|
unlock_extent_cached(&log_root->log_csum_range, sums->bytenr, lock_end,
|
|
&cached_state);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static noinline int copy_items(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_path *dst_path,
|
|
struct btrfs_path *src_path,
|
|
int start_slot, int nr, int inode_only,
|
|
u64 logged_isize)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
unsigned long src_offset;
|
|
unsigned long dst_offset;
|
|
struct btrfs_root *log = inode->root->log_root;
|
|
struct btrfs_file_extent_item *extent;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct extent_buffer *src = src_path->nodes[0];
|
|
int ret;
|
|
struct btrfs_key *ins_keys;
|
|
u32 *ins_sizes;
|
|
char *ins_data;
|
|
int i;
|
|
struct list_head ordered_sums;
|
|
int skip_csum = inode->flags & BTRFS_INODE_NODATASUM;
|
|
|
|
INIT_LIST_HEAD(&ordered_sums);
|
|
|
|
ins_data = kmalloc(nr * sizeof(struct btrfs_key) +
|
|
nr * sizeof(u32), GFP_NOFS);
|
|
if (!ins_data)
|
|
return -ENOMEM;
|
|
|
|
ins_sizes = (u32 *)ins_data;
|
|
ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32));
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot);
|
|
btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot);
|
|
}
|
|
ret = btrfs_insert_empty_items(trans, log, dst_path,
|
|
ins_keys, ins_sizes, nr);
|
|
if (ret) {
|
|
kfree(ins_data);
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < nr; i++, dst_path->slots[0]++) {
|
|
dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0],
|
|
dst_path->slots[0]);
|
|
|
|
src_offset = btrfs_item_ptr_offset(src, start_slot + i);
|
|
|
|
if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) {
|
|
inode_item = btrfs_item_ptr(dst_path->nodes[0],
|
|
dst_path->slots[0],
|
|
struct btrfs_inode_item);
|
|
fill_inode_item(trans, dst_path->nodes[0], inode_item,
|
|
&inode->vfs_inode,
|
|
inode_only == LOG_INODE_EXISTS,
|
|
logged_isize);
|
|
} else {
|
|
copy_extent_buffer(dst_path->nodes[0], src, dst_offset,
|
|
src_offset, ins_sizes[i]);
|
|
}
|
|
|
|
/* take a reference on file data extents so that truncates
|
|
* or deletes of this inode don't have to relog the inode
|
|
* again
|
|
*/
|
|
if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY &&
|
|
!skip_csum) {
|
|
int found_type;
|
|
extent = btrfs_item_ptr(src, start_slot + i,
|
|
struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_generation(src, extent) < trans->transid)
|
|
continue;
|
|
|
|
found_type = btrfs_file_extent_type(src, extent);
|
|
if (found_type == BTRFS_FILE_EXTENT_REG) {
|
|
u64 ds, dl, cs, cl;
|
|
ds = btrfs_file_extent_disk_bytenr(src,
|
|
extent);
|
|
/* ds == 0 is a hole */
|
|
if (ds == 0)
|
|
continue;
|
|
|
|
dl = btrfs_file_extent_disk_num_bytes(src,
|
|
extent);
|
|
cs = btrfs_file_extent_offset(src, extent);
|
|
cl = btrfs_file_extent_num_bytes(src,
|
|
extent);
|
|
if (btrfs_file_extent_compression(src,
|
|
extent)) {
|
|
cs = 0;
|
|
cl = dl;
|
|
}
|
|
|
|
ret = btrfs_lookup_csums_range(
|
|
fs_info->csum_root,
|
|
ds + cs, ds + cs + cl - 1,
|
|
&ordered_sums, 0);
|
|
if (ret)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
btrfs_mark_buffer_dirty(dst_path->nodes[0]);
|
|
btrfs_release_path(dst_path);
|
|
kfree(ins_data);
|
|
|
|
/*
|
|
* we have to do this after the loop above to avoid changing the
|
|
* log tree while trying to change the log tree.
|
|
*/
|
|
while (!list_empty(&ordered_sums)) {
|
|
struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next,
|
|
struct btrfs_ordered_sum,
|
|
list);
|
|
if (!ret)
|
|
ret = log_csums(trans, inode, log, sums);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int extent_cmp(void *priv, struct list_head *a, struct list_head *b)
|
|
{
|
|
struct extent_map *em1, *em2;
|
|
|
|
em1 = list_entry(a, struct extent_map, list);
|
|
em2 = list_entry(b, struct extent_map, list);
|
|
|
|
if (em1->start < em2->start)
|
|
return -1;
|
|
else if (em1->start > em2->start)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int log_extent_csums(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_root *log_root,
|
|
const struct extent_map *em,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
u64 csum_offset;
|
|
u64 csum_len;
|
|
u64 mod_start = em->mod_start;
|
|
u64 mod_len = em->mod_len;
|
|
LIST_HEAD(ordered_sums);
|
|
int ret = 0;
|
|
|
|
if (inode->flags & BTRFS_INODE_NODATASUM ||
|
|
test_bit(EXTENT_FLAG_PREALLOC, &em->flags) ||
|
|
em->block_start == EXTENT_MAP_HOLE)
|
|
return 0;
|
|
|
|
list_for_each_entry(ordered, &ctx->ordered_extents, log_list) {
|
|
const u64 ordered_end = ordered->file_offset + ordered->num_bytes;
|
|
const u64 mod_end = mod_start + mod_len;
|
|
struct btrfs_ordered_sum *sums;
|
|
|
|
if (mod_len == 0)
|
|
break;
|
|
|
|
if (ordered_end <= mod_start)
|
|
continue;
|
|
if (mod_end <= ordered->file_offset)
|
|
break;
|
|
|
|
/*
|
|
* We are going to copy all the csums on this ordered extent, so
|
|
* go ahead and adjust mod_start and mod_len in case this ordered
|
|
* extent has already been logged.
|
|
*/
|
|
if (ordered->file_offset > mod_start) {
|
|
if (ordered_end >= mod_end)
|
|
mod_len = ordered->file_offset - mod_start;
|
|
/*
|
|
* If we have this case
|
|
*
|
|
* |--------- logged extent ---------|
|
|
* |----- ordered extent ----|
|
|
*
|
|
* Just don't mess with mod_start and mod_len, we'll
|
|
* just end up logging more csums than we need and it
|
|
* will be ok.
|
|
*/
|
|
} else {
|
|
if (ordered_end < mod_end) {
|
|
mod_len = mod_end - ordered_end;
|
|
mod_start = ordered_end;
|
|
} else {
|
|
mod_len = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* To keep us from looping for the above case of an ordered
|
|
* extent that falls inside of the logged extent.
|
|
*/
|
|
if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM, &ordered->flags))
|
|
continue;
|
|
|
|
list_for_each_entry(sums, &ordered->list, list) {
|
|
ret = log_csums(trans, inode, log_root, sums);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* We're done, found all csums in the ordered extents. */
|
|
if (mod_len == 0)
|
|
return 0;
|
|
|
|
/* If we're compressed we have to save the entire range of csums. */
|
|
if (em->compress_type) {
|
|
csum_offset = 0;
|
|
csum_len = max(em->block_len, em->orig_block_len);
|
|
} else {
|
|
csum_offset = mod_start - em->start;
|
|
csum_len = mod_len;
|
|
}
|
|
|
|
/* block start is already adjusted for the file extent offset. */
|
|
ret = btrfs_lookup_csums_range(trans->fs_info->csum_root,
|
|
em->block_start + csum_offset,
|
|
em->block_start + csum_offset +
|
|
csum_len - 1, &ordered_sums, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
while (!list_empty(&ordered_sums)) {
|
|
struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next,
|
|
struct btrfs_ordered_sum,
|
|
list);
|
|
if (!ret)
|
|
ret = log_csums(trans, inode, log_root, sums);
|
|
list_del(&sums->list);
|
|
kfree(sums);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int log_one_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode, struct btrfs_root *root,
|
|
const struct extent_map *em,
|
|
struct btrfs_path *path,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_drop_extents_args drop_args = { 0 };
|
|
struct btrfs_root *log = root->log_root;
|
|
struct btrfs_file_extent_item *fi;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_map_token token;
|
|
struct btrfs_key key;
|
|
u64 extent_offset = em->start - em->orig_start;
|
|
u64 block_len;
|
|
int ret;
|
|
|
|
ret = log_extent_csums(trans, inode, log, em, ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
drop_args.path = path;
|
|
drop_args.start = em->start;
|
|
drop_args.end = em->start + em->len;
|
|
drop_args.replace_extent = true;
|
|
drop_args.extent_item_size = sizeof(*fi);
|
|
ret = btrfs_drop_extents(trans, log, inode, &drop_args);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!drop_args.extent_inserted) {
|
|
key.objectid = btrfs_ino(inode);
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = em->start;
|
|
|
|
ret = btrfs_insert_empty_item(trans, log, path, &key,
|
|
sizeof(*fi));
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
leaf = path->nodes[0];
|
|
btrfs_init_map_token(&token, leaf);
|
|
fi = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_file_extent_item);
|
|
|
|
btrfs_set_token_file_extent_generation(&token, fi, trans->transid);
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
|
|
btrfs_set_token_file_extent_type(&token, fi,
|
|
BTRFS_FILE_EXTENT_PREALLOC);
|
|
else
|
|
btrfs_set_token_file_extent_type(&token, fi,
|
|
BTRFS_FILE_EXTENT_REG);
|
|
|
|
block_len = max(em->block_len, em->orig_block_len);
|
|
if (em->compress_type != BTRFS_COMPRESS_NONE) {
|
|
btrfs_set_token_file_extent_disk_bytenr(&token, fi,
|
|
em->block_start);
|
|
btrfs_set_token_file_extent_disk_num_bytes(&token, fi, block_len);
|
|
} else if (em->block_start < EXTENT_MAP_LAST_BYTE) {
|
|
btrfs_set_token_file_extent_disk_bytenr(&token, fi,
|
|
em->block_start -
|
|
extent_offset);
|
|
btrfs_set_token_file_extent_disk_num_bytes(&token, fi, block_len);
|
|
} else {
|
|
btrfs_set_token_file_extent_disk_bytenr(&token, fi, 0);
|
|
btrfs_set_token_file_extent_disk_num_bytes(&token, fi, 0);
|
|
}
|
|
|
|
btrfs_set_token_file_extent_offset(&token, fi, extent_offset);
|
|
btrfs_set_token_file_extent_num_bytes(&token, fi, em->len);
|
|
btrfs_set_token_file_extent_ram_bytes(&token, fi, em->ram_bytes);
|
|
btrfs_set_token_file_extent_compression(&token, fi, em->compress_type);
|
|
btrfs_set_token_file_extent_encryption(&token, fi, 0);
|
|
btrfs_set_token_file_extent_other_encoding(&token, fi, 0);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
btrfs_release_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Log all prealloc extents beyond the inode's i_size to make sure we do not
|
|
* lose them after doing a fast fsync and replaying the log. We scan the
|
|
* subvolume's root instead of iterating the inode's extent map tree because
|
|
* otherwise we can log incorrect extent items based on extent map conversion.
|
|
* That can happen due to the fact that extent maps are merged when they
|
|
* are not in the extent map tree's list of modified extents.
|
|
*/
|
|
static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_path *path)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct btrfs_key key;
|
|
const u64 i_size = i_size_read(&inode->vfs_inode);
|
|
const u64 ino = btrfs_ino(inode);
|
|
struct btrfs_path *dst_path = NULL;
|
|
bool dropped_extents = false;
|
|
u64 truncate_offset = i_size;
|
|
struct extent_buffer *leaf;
|
|
int slot;
|
|
int ins_nr = 0;
|
|
int start_slot;
|
|
int ret;
|
|
|
|
if (!(inode->flags & BTRFS_INODE_PREALLOC))
|
|
return 0;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = i_size;
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* We must check if there is a prealloc extent that starts before the
|
|
* i_size and crosses the i_size boundary. This is to ensure later we
|
|
* truncate down to the end of that extent and not to the i_size, as
|
|
* otherwise we end up losing part of the prealloc extent after a log
|
|
* replay and with an implicit hole if there is another prealloc extent
|
|
* that starts at an offset beyond i_size.
|
|
*/
|
|
ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret == 0) {
|
|
struct btrfs_file_extent_item *ei;
|
|
|
|
leaf = path->nodes[0];
|
|
slot = path->slots[0];
|
|
ei = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
|
|
|
|
if (btrfs_file_extent_type(leaf, ei) ==
|
|
BTRFS_FILE_EXTENT_PREALLOC) {
|
|
u64 extent_end;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
extent_end = key.offset +
|
|
btrfs_file_extent_num_bytes(leaf, ei);
|
|
|
|
if (extent_end > i_size)
|
|
truncate_offset = extent_end;
|
|
}
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
|
|
while (true) {
|
|
leaf = path->nodes[0];
|
|
slot = path->slots[0];
|
|
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
if (ins_nr > 0) {
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
start_slot, ins_nr, 1, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
ins_nr = 0;
|
|
}
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
if (key.objectid > ino)
|
|
break;
|
|
if (WARN_ON_ONCE(key.objectid < ino) ||
|
|
key.type < BTRFS_EXTENT_DATA_KEY ||
|
|
key.offset < i_size) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
if (!dropped_extents) {
|
|
/*
|
|
* Avoid logging extent items logged in past fsync calls
|
|
* and leading to duplicate keys in the log tree.
|
|
*/
|
|
do {
|
|
ret = btrfs_truncate_inode_items(trans,
|
|
root->log_root,
|
|
inode, truncate_offset,
|
|
BTRFS_EXTENT_DATA_KEY);
|
|
} while (ret == -EAGAIN);
|
|
if (ret)
|
|
goto out;
|
|
dropped_extents = true;
|
|
}
|
|
if (ins_nr == 0)
|
|
start_slot = slot;
|
|
ins_nr++;
|
|
path->slots[0]++;
|
|
if (!dst_path) {
|
|
dst_path = btrfs_alloc_path();
|
|
if (!dst_path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
if (ins_nr > 0)
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
start_slot, ins_nr, 1, 0);
|
|
out:
|
|
btrfs_release_path(path);
|
|
btrfs_free_path(dst_path);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_path *path,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
struct btrfs_ordered_extent *tmp;
|
|
struct extent_map *em, *n;
|
|
struct list_head extents;
|
|
struct extent_map_tree *tree = &inode->extent_tree;
|
|
int ret = 0;
|
|
int num = 0;
|
|
|
|
INIT_LIST_HEAD(&extents);
|
|
|
|
write_lock(&tree->lock);
|
|
|
|
list_for_each_entry_safe(em, n, &tree->modified_extents, list) {
|
|
list_del_init(&em->list);
|
|
/*
|
|
* Just an arbitrary number, this can be really CPU intensive
|
|
* once we start getting a lot of extents, and really once we
|
|
* have a bunch of extents we just want to commit since it will
|
|
* be faster.
|
|
*/
|
|
if (++num > 32768) {
|
|
list_del_init(&tree->modified_extents);
|
|
ret = -EFBIG;
|
|
goto process;
|
|
}
|
|
|
|
if (em->generation < trans->transid)
|
|
continue;
|
|
|
|
/* We log prealloc extents beyond eof later. */
|
|
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) &&
|
|
em->start >= i_size_read(&inode->vfs_inode))
|
|
continue;
|
|
|
|
/* Need a ref to keep it from getting evicted from cache */
|
|
refcount_inc(&em->refs);
|
|
set_bit(EXTENT_FLAG_LOGGING, &em->flags);
|
|
list_add_tail(&em->list, &extents);
|
|
num++;
|
|
}
|
|
|
|
list_sort(NULL, &extents, extent_cmp);
|
|
process:
|
|
while (!list_empty(&extents)) {
|
|
em = list_entry(extents.next, struct extent_map, list);
|
|
|
|
list_del_init(&em->list);
|
|
|
|
/*
|
|
* If we had an error we just need to delete everybody from our
|
|
* private list.
|
|
*/
|
|
if (ret) {
|
|
clear_em_logging(tree, em);
|
|
free_extent_map(em);
|
|
continue;
|
|
}
|
|
|
|
write_unlock(&tree->lock);
|
|
|
|
ret = log_one_extent(trans, inode, root, em, path, ctx);
|
|
write_lock(&tree->lock);
|
|
clear_em_logging(tree, em);
|
|
free_extent_map(em);
|
|
}
|
|
WARN_ON(!list_empty(&extents));
|
|
write_unlock(&tree->lock);
|
|
|
|
btrfs_release_path(path);
|
|
if (!ret)
|
|
ret = btrfs_log_prealloc_extents(trans, inode, path);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* We have logged all extents successfully, now make sure the commit of
|
|
* the current transaction waits for the ordered extents to complete
|
|
* before it commits and wipes out the log trees, otherwise we would
|
|
* lose data if an ordered extents completes after the transaction
|
|
* commits and a power failure happens after the transaction commit.
|
|
*/
|
|
list_for_each_entry_safe(ordered, tmp, &ctx->ordered_extents, log_list) {
|
|
list_del_init(&ordered->log_list);
|
|
set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags);
|
|
|
|
if (!test_bit(BTRFS_ORDERED_COMPLETE, &ordered->flags)) {
|
|
spin_lock_irq(&inode->ordered_tree.lock);
|
|
if (!test_bit(BTRFS_ORDERED_COMPLETE, &ordered->flags)) {
|
|
set_bit(BTRFS_ORDERED_PENDING, &ordered->flags);
|
|
atomic_inc(&trans->transaction->pending_ordered);
|
|
}
|
|
spin_unlock_irq(&inode->ordered_tree.lock);
|
|
}
|
|
btrfs_put_ordered_extent(ordered);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int logged_inode_size(struct btrfs_root *log, struct btrfs_inode *inode,
|
|
struct btrfs_path *path, u64 *size_ret)
|
|
{
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
key.objectid = btrfs_ino(inode);
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot(NULL, log, &key, path, 0, 0);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret > 0) {
|
|
*size_ret = 0;
|
|
} else {
|
|
struct btrfs_inode_item *item;
|
|
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
*size_ret = btrfs_inode_size(path->nodes[0], item);
|
|
/*
|
|
* If the in-memory inode's i_size is smaller then the inode
|
|
* size stored in the btree, return the inode's i_size, so
|
|
* that we get a correct inode size after replaying the log
|
|
* when before a power failure we had a shrinking truncate
|
|
* followed by addition of a new name (rename / new hard link).
|
|
* Otherwise return the inode size from the btree, to avoid
|
|
* data loss when replaying a log due to previously doing a
|
|
* write that expands the inode's size and logging a new name
|
|
* immediately after.
|
|
*/
|
|
if (*size_ret > inode->vfs_inode.i_size)
|
|
*size_ret = inode->vfs_inode.i_size;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* At the moment we always log all xattrs. This is to figure out at log replay
|
|
* time which xattrs must have their deletion replayed. If a xattr is missing
|
|
* in the log tree and exists in the fs/subvol tree, we delete it. This is
|
|
* because if a xattr is deleted, the inode is fsynced and a power failure
|
|
* happens, causing the log to be replayed the next time the fs is mounted,
|
|
* we want the xattr to not exist anymore (same behaviour as other filesystems
|
|
* with a journal, ext3/4, xfs, f2fs, etc).
|
|
*/
|
|
static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_path *path,
|
|
struct btrfs_path *dst_path)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
const u64 ino = btrfs_ino(inode);
|
|
int ins_nr = 0;
|
|
int start_slot = 0;
|
|
bool found_xattrs = false;
|
|
|
|
if (test_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags))
|
|
return 0;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_XATTR_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
while (true) {
|
|
int slot = path->slots[0];
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int nritems = btrfs_header_nritems(leaf);
|
|
|
|
if (slot >= nritems) {
|
|
if (ins_nr > 0) {
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
start_slot, ins_nr, 1, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
ins_nr = 0;
|
|
}
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
return ret;
|
|
else if (ret > 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY)
|
|
break;
|
|
|
|
if (ins_nr == 0)
|
|
start_slot = slot;
|
|
ins_nr++;
|
|
path->slots[0]++;
|
|
found_xattrs = true;
|
|
cond_resched();
|
|
}
|
|
if (ins_nr > 0) {
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
start_slot, ins_nr, 1, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (!found_xattrs)
|
|
set_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* When using the NO_HOLES feature if we punched a hole that causes the
|
|
* deletion of entire leafs or all the extent items of the first leaf (the one
|
|
* that contains the inode item and references) we may end up not processing
|
|
* any extents, because there are no leafs with a generation matching the
|
|
* current transaction that have extent items for our inode. So we need to find
|
|
* if any holes exist and then log them. We also need to log holes after any
|
|
* truncate operation that changes the inode's size.
|
|
*/
|
|
static int btrfs_log_holes(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_path *path)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key key;
|
|
const u64 ino = btrfs_ino(inode);
|
|
const u64 i_size = i_size_read(&inode->vfs_inode);
|
|
u64 prev_extent_end = 0;
|
|
int ret;
|
|
|
|
if (!btrfs_fs_incompat(fs_info, NO_HOLES) || i_size == 0)
|
|
return 0;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_EXTENT_DATA_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
while (true) {
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
|
|
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY)
|
|
break;
|
|
|
|
/* We have a hole, log it. */
|
|
if (prev_extent_end < key.offset) {
|
|
const u64 hole_len = key.offset - prev_extent_end;
|
|
|
|
/*
|
|
* Release the path to avoid deadlocks with other code
|
|
* paths that search the root while holding locks on
|
|
* leafs from the log root.
|
|
*/
|
|
btrfs_release_path(path);
|
|
ret = btrfs_insert_file_extent(trans, root->log_root,
|
|
ino, prev_extent_end, 0,
|
|
0, hole_len, 0, hole_len,
|
|
0, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* Search for the same key again in the root. Since it's
|
|
* an extent item and we are holding the inode lock, the
|
|
* key must still exist. If it doesn't just emit warning
|
|
* and return an error to fall back to a transaction
|
|
* commit.
|
|
*/
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (WARN_ON(ret > 0))
|
|
return -ENOENT;
|
|
leaf = path->nodes[0];
|
|
}
|
|
|
|
prev_extent_end = btrfs_file_extent_end(path);
|
|
path->slots[0]++;
|
|
cond_resched();
|
|
}
|
|
|
|
if (prev_extent_end < i_size) {
|
|
u64 hole_len;
|
|
|
|
btrfs_release_path(path);
|
|
hole_len = ALIGN(i_size - prev_extent_end, fs_info->sectorsize);
|
|
ret = btrfs_insert_file_extent(trans, root->log_root,
|
|
ino, prev_extent_end, 0, 0,
|
|
hole_len, 0, hole_len,
|
|
0, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* When we are logging a new inode X, check if it doesn't have a reference that
|
|
* matches the reference from some other inode Y created in a past transaction
|
|
* and that was renamed in the current transaction. If we don't do this, then at
|
|
* log replay time we can lose inode Y (and all its files if it's a directory):
|
|
*
|
|
* mkdir /mnt/x
|
|
* echo "hello world" > /mnt/x/foobar
|
|
* sync
|
|
* mv /mnt/x /mnt/y
|
|
* mkdir /mnt/x # or touch /mnt/x
|
|
* xfs_io -c fsync /mnt/x
|
|
* <power fail>
|
|
* mount fs, trigger log replay
|
|
*
|
|
* After the log replay procedure, we would lose the first directory and all its
|
|
* files (file foobar).
|
|
* For the case where inode Y is not a directory we simply end up losing it:
|
|
*
|
|
* echo "123" > /mnt/foo
|
|
* sync
|
|
* mv /mnt/foo /mnt/bar
|
|
* echo "abc" > /mnt/foo
|
|
* xfs_io -c fsync /mnt/foo
|
|
* <power fail>
|
|
*
|
|
* We also need this for cases where a snapshot entry is replaced by some other
|
|
* entry (file or directory) otherwise we end up with an unreplayable log due to
|
|
* attempts to delete the snapshot entry (entry of type BTRFS_ROOT_ITEM_KEY) as
|
|
* if it were a regular entry:
|
|
*
|
|
* mkdir /mnt/x
|
|
* btrfs subvolume snapshot /mnt /mnt/x/snap
|
|
* btrfs subvolume delete /mnt/x/snap
|
|
* rmdir /mnt/x
|
|
* mkdir /mnt/x
|
|
* fsync /mnt/x or fsync some new file inside it
|
|
* <power fail>
|
|
*
|
|
* The snapshot delete, rmdir of x, mkdir of a new x and the fsync all happen in
|
|
* the same transaction.
|
|
*/
|
|
static int btrfs_check_ref_name_override(struct extent_buffer *eb,
|
|
const int slot,
|
|
const struct btrfs_key *key,
|
|
struct btrfs_inode *inode,
|
|
u64 *other_ino, u64 *other_parent)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *search_path;
|
|
char *name = NULL;
|
|
u32 name_len = 0;
|
|
u32 item_size = btrfs_item_size_nr(eb, slot);
|
|
u32 cur_offset = 0;
|
|
unsigned long ptr = btrfs_item_ptr_offset(eb, slot);
|
|
|
|
search_path = btrfs_alloc_path();
|
|
if (!search_path)
|
|
return -ENOMEM;
|
|
search_path->search_commit_root = 1;
|
|
search_path->skip_locking = 1;
|
|
|
|
while (cur_offset < item_size) {
|
|
u64 parent;
|
|
u32 this_name_len;
|
|
u32 this_len;
|
|
unsigned long name_ptr;
|
|
struct btrfs_dir_item *di;
|
|
|
|
if (key->type == BTRFS_INODE_REF_KEY) {
|
|
struct btrfs_inode_ref *iref;
|
|
|
|
iref = (struct btrfs_inode_ref *)(ptr + cur_offset);
|
|
parent = key->offset;
|
|
this_name_len = btrfs_inode_ref_name_len(eb, iref);
|
|
name_ptr = (unsigned long)(iref + 1);
|
|
this_len = sizeof(*iref) + this_name_len;
|
|
} else {
|
|
struct btrfs_inode_extref *extref;
|
|
|
|
extref = (struct btrfs_inode_extref *)(ptr +
|
|
cur_offset);
|
|
parent = btrfs_inode_extref_parent(eb, extref);
|
|
this_name_len = btrfs_inode_extref_name_len(eb, extref);
|
|
name_ptr = (unsigned long)&extref->name;
|
|
this_len = sizeof(*extref) + this_name_len;
|
|
}
|
|
|
|
if (this_name_len > name_len) {
|
|
char *new_name;
|
|
|
|
new_name = krealloc(name, this_name_len, GFP_NOFS);
|
|
if (!new_name) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
name_len = this_name_len;
|
|
name = new_name;
|
|
}
|
|
|
|
read_extent_buffer(eb, name, name_ptr, this_name_len);
|
|
di = btrfs_lookup_dir_item(NULL, inode->root, search_path,
|
|
parent, name, this_name_len, 0);
|
|
if (di && !IS_ERR(di)) {
|
|
struct btrfs_key di_key;
|
|
|
|
btrfs_dir_item_key_to_cpu(search_path->nodes[0],
|
|
di, &di_key);
|
|
if (di_key.type == BTRFS_INODE_ITEM_KEY) {
|
|
if (di_key.objectid != key->objectid) {
|
|
ret = 1;
|
|
*other_ino = di_key.objectid;
|
|
*other_parent = parent;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
} else {
|
|
ret = -EAGAIN;
|
|
}
|
|
goto out;
|
|
} else if (IS_ERR(di)) {
|
|
ret = PTR_ERR(di);
|
|
goto out;
|
|
}
|
|
btrfs_release_path(search_path);
|
|
|
|
cur_offset += this_len;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(search_path);
|
|
kfree(name);
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_ino_list {
|
|
u64 ino;
|
|
u64 parent;
|
|
struct list_head list;
|
|
};
|
|
|
|
static int log_conflicting_inodes(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_log_ctx *ctx,
|
|
u64 ino, u64 parent)
|
|
{
|
|
struct btrfs_ino_list *ino_elem;
|
|
LIST_HEAD(inode_list);
|
|
int ret = 0;
|
|
|
|
ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS);
|
|
if (!ino_elem)
|
|
return -ENOMEM;
|
|
ino_elem->ino = ino;
|
|
ino_elem->parent = parent;
|
|
list_add_tail(&ino_elem->list, &inode_list);
|
|
|
|
while (!list_empty(&inode_list)) {
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key key;
|
|
struct inode *inode;
|
|
|
|
ino_elem = list_first_entry(&inode_list, struct btrfs_ino_list,
|
|
list);
|
|
ino = ino_elem->ino;
|
|
parent = ino_elem->parent;
|
|
list_del(&ino_elem->list);
|
|
kfree(ino_elem);
|
|
if (ret)
|
|
continue;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
inode = btrfs_iget(fs_info->sb, ino, root);
|
|
/*
|
|
* If the other inode that had a conflicting dir entry was
|
|
* deleted in the current transaction, we need to log its parent
|
|
* directory.
|
|
*/
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
if (ret == -ENOENT) {
|
|
inode = btrfs_iget(fs_info->sb, parent, root);
|
|
if (IS_ERR(inode)) {
|
|
ret = PTR_ERR(inode);
|
|
} else {
|
|
ret = btrfs_log_inode(trans, root,
|
|
BTRFS_I(inode),
|
|
LOG_OTHER_INODE_ALL,
|
|
ctx);
|
|
btrfs_add_delayed_iput(inode);
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
/*
|
|
* If the inode was already logged skip it - otherwise we can
|
|
* hit an infinite loop. Example:
|
|
*
|
|
* From the commit root (previous transaction) we have the
|
|
* following inodes:
|
|
*
|
|
* inode 257 a directory
|
|
* inode 258 with references "zz" and "zz_link" on inode 257
|
|
* inode 259 with reference "a" on inode 257
|
|
*
|
|
* And in the current (uncommitted) transaction we have:
|
|
*
|
|
* inode 257 a directory, unchanged
|
|
* inode 258 with references "a" and "a2" on inode 257
|
|
* inode 259 with reference "zz_link" on inode 257
|
|
* inode 261 with reference "zz" on inode 257
|
|
*
|
|
* When logging inode 261 the following infinite loop could
|
|
* happen if we don't skip already logged inodes:
|
|
*
|
|
* - we detect inode 258 as a conflicting inode, with inode 261
|
|
* on reference "zz", and log it;
|
|
*
|
|
* - we detect inode 259 as a conflicting inode, with inode 258
|
|
* on reference "a", and log it;
|
|
*
|
|
* - we detect inode 258 as a conflicting inode, with inode 259
|
|
* on reference "zz_link", and log it - again! After this we
|
|
* repeat the above steps forever.
|
|
*/
|
|
spin_lock(&BTRFS_I(inode)->lock);
|
|
/*
|
|
* Check the inode's logged_trans only instead of
|
|
* btrfs_inode_in_log(). This is because the last_log_commit of
|
|
* the inode is not updated when we only log that it exists and
|
|
* it has the full sync bit set (see btrfs_log_inode()).
|
|
*/
|
|
if (BTRFS_I(inode)->logged_trans == trans->transid) {
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
btrfs_add_delayed_iput(inode);
|
|
continue;
|
|
}
|
|
spin_unlock(&BTRFS_I(inode)->lock);
|
|
/*
|
|
* We are safe logging the other inode without acquiring its
|
|
* lock as long as we log with the LOG_INODE_EXISTS mode. We
|
|
* are safe against concurrent renames of the other inode as
|
|
* well because during a rename we pin the log and update the
|
|
* log with the new name before we unpin it.
|
|
*/
|
|
ret = btrfs_log_inode(trans, root, BTRFS_I(inode),
|
|
LOG_OTHER_INODE, ctx);
|
|
if (ret) {
|
|
btrfs_add_delayed_iput(inode);
|
|
continue;
|
|
}
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0) {
|
|
btrfs_add_delayed_iput(inode);
|
|
continue;
|
|
}
|
|
|
|
while (true) {
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int slot = path->slots[0];
|
|
u64 other_ino = 0;
|
|
u64 other_parent = 0;
|
|
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0) {
|
|
break;
|
|
} else if (ret > 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
if (key.objectid != ino ||
|
|
(key.type != BTRFS_INODE_REF_KEY &&
|
|
key.type != BTRFS_INODE_EXTREF_KEY)) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
ret = btrfs_check_ref_name_override(leaf, slot, &key,
|
|
BTRFS_I(inode), &other_ino,
|
|
&other_parent);
|
|
if (ret < 0)
|
|
break;
|
|
if (ret > 0) {
|
|
ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS);
|
|
if (!ino_elem) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ino_elem->ino = other_ino;
|
|
ino_elem->parent = other_parent;
|
|
list_add_tail(&ino_elem->list, &inode_list);
|
|
ret = 0;
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
btrfs_add_delayed_iput(inode);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int copy_inode_items_to_log(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_key *min_key,
|
|
const struct btrfs_key *max_key,
|
|
struct btrfs_path *path,
|
|
struct btrfs_path *dst_path,
|
|
const u64 logged_isize,
|
|
const bool recursive_logging,
|
|
const int inode_only,
|
|
struct btrfs_log_ctx *ctx,
|
|
bool *need_log_inode_item)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
int ins_start_slot = 0;
|
|
int ins_nr = 0;
|
|
int ret;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_forward(root, min_key, path, trans->transid);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret > 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
again:
|
|
/* Note, ins_nr might be > 0 here, cleanup outside the loop */
|
|
if (min_key->objectid != max_key->objectid)
|
|
break;
|
|
if (min_key->type > max_key->type)
|
|
break;
|
|
|
|
if (min_key->type == BTRFS_INODE_ITEM_KEY)
|
|
*need_log_inode_item = false;
|
|
|
|
if ((min_key->type == BTRFS_INODE_REF_KEY ||
|
|
min_key->type == BTRFS_INODE_EXTREF_KEY) &&
|
|
inode->generation == trans->transid &&
|
|
!recursive_logging) {
|
|
u64 other_ino = 0;
|
|
u64 other_parent = 0;
|
|
|
|
ret = btrfs_check_ref_name_override(path->nodes[0],
|
|
path->slots[0], min_key, inode,
|
|
&other_ino, &other_parent);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret > 0 && ctx &&
|
|
other_ino != btrfs_ino(BTRFS_I(ctx->inode))) {
|
|
if (ins_nr > 0) {
|
|
ins_nr++;
|
|
} else {
|
|
ins_nr = 1;
|
|
ins_start_slot = path->slots[0];
|
|
}
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
ins_start_slot, ins_nr,
|
|
inode_only, logged_isize);
|
|
if (ret < 0)
|
|
return ret;
|
|
ins_nr = 0;
|
|
|
|
ret = log_conflicting_inodes(trans, root, path,
|
|
ctx, other_ino, other_parent);
|
|
if (ret)
|
|
return ret;
|
|
btrfs_release_path(path);
|
|
goto next_key;
|
|
}
|
|
}
|
|
|
|
/* Skip xattrs, we log them later with btrfs_log_all_xattrs() */
|
|
if (min_key->type == BTRFS_XATTR_ITEM_KEY) {
|
|
if (ins_nr == 0)
|
|
goto next_slot;
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
ins_start_slot,
|
|
ins_nr, inode_only, logged_isize);
|
|
if (ret < 0)
|
|
return ret;
|
|
ins_nr = 0;
|
|
goto next_slot;
|
|
}
|
|
|
|
if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) {
|
|
ins_nr++;
|
|
goto next_slot;
|
|
} else if (!ins_nr) {
|
|
ins_start_slot = path->slots[0];
|
|
ins_nr = 1;
|
|
goto next_slot;
|
|
}
|
|
|
|
ret = copy_items(trans, inode, dst_path, path, ins_start_slot,
|
|
ins_nr, inode_only, logged_isize);
|
|
if (ret < 0)
|
|
return ret;
|
|
ins_nr = 1;
|
|
ins_start_slot = path->slots[0];
|
|
next_slot:
|
|
path->slots[0]++;
|
|
if (path->slots[0] < btrfs_header_nritems(path->nodes[0])) {
|
|
btrfs_item_key_to_cpu(path->nodes[0], min_key,
|
|
path->slots[0]);
|
|
goto again;
|
|
}
|
|
if (ins_nr) {
|
|
ret = copy_items(trans, inode, dst_path, path,
|
|
ins_start_slot, ins_nr, inode_only,
|
|
logged_isize);
|
|
if (ret < 0)
|
|
return ret;
|
|
ins_nr = 0;
|
|
}
|
|
btrfs_release_path(path);
|
|
next_key:
|
|
if (min_key->offset < (u64)-1) {
|
|
min_key->offset++;
|
|
} else if (min_key->type < max_key->type) {
|
|
min_key->type++;
|
|
min_key->offset = 0;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (ins_nr)
|
|
ret = copy_items(trans, inode, dst_path, path, ins_start_slot,
|
|
ins_nr, inode_only, logged_isize);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* log a single inode in the tree log.
|
|
* At least one parent directory for this inode must exist in the tree
|
|
* or be logged already.
|
|
*
|
|
* Any items from this inode changed by the current transaction are copied
|
|
* to the log tree. An extra reference is taken on any extents in this
|
|
* file, allowing us to avoid a whole pile of corner cases around logging
|
|
* blocks that have been removed from the tree.
|
|
*
|
|
* See LOG_INODE_ALL and related defines for a description of what inode_only
|
|
* does.
|
|
*
|
|
* This handles both files and directories.
|
|
*/
|
|
static int btrfs_log_inode(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct btrfs_inode *inode,
|
|
int inode_only,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_path *dst_path;
|
|
struct btrfs_key min_key;
|
|
struct btrfs_key max_key;
|
|
struct btrfs_root *log = root->log_root;
|
|
int err = 0;
|
|
int ret = 0;
|
|
bool fast_search = false;
|
|
u64 ino = btrfs_ino(inode);
|
|
struct extent_map_tree *em_tree = &inode->extent_tree;
|
|
u64 logged_isize = 0;
|
|
bool need_log_inode_item = true;
|
|
bool xattrs_logged = false;
|
|
bool recursive_logging = false;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
dst_path = btrfs_alloc_path();
|
|
if (!dst_path) {
|
|
btrfs_free_path(path);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
min_key.objectid = ino;
|
|
min_key.type = BTRFS_INODE_ITEM_KEY;
|
|
min_key.offset = 0;
|
|
|
|
max_key.objectid = ino;
|
|
|
|
|
|
/* today the code can only do partial logging of directories */
|
|
if (S_ISDIR(inode->vfs_inode.i_mode) ||
|
|
(!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
|
|
&inode->runtime_flags) &&
|
|
inode_only >= LOG_INODE_EXISTS))
|
|
max_key.type = BTRFS_XATTR_ITEM_KEY;
|
|
else
|
|
max_key.type = (u8)-1;
|
|
max_key.offset = (u64)-1;
|
|
|
|
/*
|
|
* Only run delayed items if we are a directory. We want to make sure
|
|
* all directory indexes hit the fs/subvolume tree so we can find them
|
|
* and figure out which index ranges have to be logged.
|
|
*
|
|
* Otherwise commit the delayed inode only if the full sync flag is set,
|
|
* as we want to make sure an up to date version is in the subvolume
|
|
* tree so copy_inode_items_to_log() / copy_items() can find it and copy
|
|
* it to the log tree. For a non full sync, we always log the inode item
|
|
* based on the in-memory struct btrfs_inode which is always up to date.
|
|
*/
|
|
if (S_ISDIR(inode->vfs_inode.i_mode))
|
|
ret = btrfs_commit_inode_delayed_items(trans, inode);
|
|
else if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags))
|
|
ret = btrfs_commit_inode_delayed_inode(inode);
|
|
|
|
if (ret) {
|
|
btrfs_free_path(path);
|
|
btrfs_free_path(dst_path);
|
|
return ret;
|
|
}
|
|
|
|
if (inode_only == LOG_OTHER_INODE || inode_only == LOG_OTHER_INODE_ALL) {
|
|
recursive_logging = true;
|
|
if (inode_only == LOG_OTHER_INODE)
|
|
inode_only = LOG_INODE_EXISTS;
|
|
else
|
|
inode_only = LOG_INODE_ALL;
|
|
mutex_lock_nested(&inode->log_mutex, SINGLE_DEPTH_NESTING);
|
|
} else {
|
|
mutex_lock(&inode->log_mutex);
|
|
}
|
|
|
|
/*
|
|
* a brute force approach to making sure we get the most uptodate
|
|
* copies of everything.
|
|
*/
|
|
if (S_ISDIR(inode->vfs_inode.i_mode)) {
|
|
int max_key_type = BTRFS_DIR_LOG_INDEX_KEY;
|
|
|
|
if (inode_only == LOG_INODE_EXISTS)
|
|
max_key_type = BTRFS_XATTR_ITEM_KEY;
|
|
ret = drop_objectid_items(trans, log, path, ino, max_key_type);
|
|
} else {
|
|
if (inode_only == LOG_INODE_EXISTS) {
|
|
/*
|
|
* Make sure the new inode item we write to the log has
|
|
* the same isize as the current one (if it exists).
|
|
* This is necessary to prevent data loss after log
|
|
* replay, and also to prevent doing a wrong expanding
|
|
* truncate - for e.g. create file, write 4K into offset
|
|
* 0, fsync, write 4K into offset 4096, add hard link,
|
|
* fsync some other file (to sync log), power fail - if
|
|
* we use the inode's current i_size, after log replay
|
|
* we get a 8Kb file, with the last 4Kb extent as a hole
|
|
* (zeroes), as if an expanding truncate happened,
|
|
* instead of getting a file of 4Kb only.
|
|
*/
|
|
err = logged_inode_size(log, inode, path, &logged_isize);
|
|
if (err)
|
|
goto out_unlock;
|
|
}
|
|
if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
|
|
&inode->runtime_flags)) {
|
|
if (inode_only == LOG_INODE_EXISTS) {
|
|
max_key.type = BTRFS_XATTR_ITEM_KEY;
|
|
ret = drop_objectid_items(trans, log, path, ino,
|
|
max_key.type);
|
|
} else {
|
|
clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
|
|
&inode->runtime_flags);
|
|
clear_bit(BTRFS_INODE_COPY_EVERYTHING,
|
|
&inode->runtime_flags);
|
|
while(1) {
|
|
ret = btrfs_truncate_inode_items(trans,
|
|
log, inode, 0, 0);
|
|
if (ret != -EAGAIN)
|
|
break;
|
|
}
|
|
}
|
|
} else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING,
|
|
&inode->runtime_flags) ||
|
|
inode_only == LOG_INODE_EXISTS) {
|
|
if (inode_only == LOG_INODE_ALL)
|
|
fast_search = true;
|
|
max_key.type = BTRFS_XATTR_ITEM_KEY;
|
|
ret = drop_objectid_items(trans, log, path, ino,
|
|
max_key.type);
|
|
} else {
|
|
if (inode_only == LOG_INODE_ALL)
|
|
fast_search = true;
|
|
goto log_extents;
|
|
}
|
|
|
|
}
|
|
if (ret) {
|
|
err = ret;
|
|
goto out_unlock;
|
|
}
|
|
|
|
err = copy_inode_items_to_log(trans, inode, &min_key, &max_key,
|
|
path, dst_path, logged_isize,
|
|
recursive_logging, inode_only, ctx,
|
|
&need_log_inode_item);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
btrfs_release_path(path);
|
|
btrfs_release_path(dst_path);
|
|
err = btrfs_log_all_xattrs(trans, root, inode, path, dst_path);
|
|
if (err)
|
|
goto out_unlock;
|
|
xattrs_logged = true;
|
|
if (max_key.type >= BTRFS_EXTENT_DATA_KEY && !fast_search) {
|
|
btrfs_release_path(path);
|
|
btrfs_release_path(dst_path);
|
|
err = btrfs_log_holes(trans, root, inode, path);
|
|
if (err)
|
|
goto out_unlock;
|
|
}
|
|
log_extents:
|
|
btrfs_release_path(path);
|
|
btrfs_release_path(dst_path);
|
|
if (need_log_inode_item) {
|
|
err = log_inode_item(trans, log, dst_path, inode);
|
|
if (!err && !xattrs_logged) {
|
|
err = btrfs_log_all_xattrs(trans, root, inode, path,
|
|
dst_path);
|
|
btrfs_release_path(path);
|
|
}
|
|
if (err)
|
|
goto out_unlock;
|
|
}
|
|
if (fast_search) {
|
|
ret = btrfs_log_changed_extents(trans, root, inode, dst_path,
|
|
ctx);
|
|
if (ret) {
|
|
err = ret;
|
|
goto out_unlock;
|
|
}
|
|
} else if (inode_only == LOG_INODE_ALL) {
|
|
struct extent_map *em, *n;
|
|
|
|
write_lock(&em_tree->lock);
|
|
list_for_each_entry_safe(em, n, &em_tree->modified_extents, list)
|
|
list_del_init(&em->list);
|
|
write_unlock(&em_tree->lock);
|
|
}
|
|
|
|
if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->vfs_inode.i_mode)) {
|
|
ret = log_directory_changes(trans, root, inode, path, dst_path,
|
|
ctx);
|
|
if (ret) {
|
|
err = ret;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we are logging that an ancestor inode exists as part of logging a
|
|
* new name from a link or rename operation, don't mark the inode as
|
|
* logged - otherwise if an explicit fsync is made against an ancestor,
|
|
* the fsync considers the inode in the log and doesn't sync the log,
|
|
* resulting in the ancestor missing after a power failure unless the
|
|
* log was synced as part of an fsync against any other unrelated inode.
|
|
* So keep it simple for this case and just don't flag the ancestors as
|
|
* logged.
|
|
*/
|
|
if (!ctx ||
|
|
!(S_ISDIR(inode->vfs_inode.i_mode) && ctx->logging_new_name &&
|
|
&inode->vfs_inode != ctx->inode)) {
|
|
spin_lock(&inode->lock);
|
|
inode->logged_trans = trans->transid;
|
|
/*
|
|
* Don't update last_log_commit if we logged that an inode exists
|
|
* after it was loaded to memory (full_sync bit set).
|
|
* This is to prevent data loss when we do a write to the inode,
|
|
* then the inode gets evicted after all delalloc was flushed,
|
|
* then we log it exists (due to a rename for example) and then
|
|
* fsync it. This last fsync would do nothing (not logging the
|
|
* extents previously written).
|
|
*/
|
|
if (inode_only != LOG_INODE_EXISTS ||
|
|
!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags))
|
|
inode->last_log_commit = inode->last_sub_trans;
|
|
spin_unlock(&inode->lock);
|
|
}
|
|
out_unlock:
|
|
mutex_unlock(&inode->log_mutex);
|
|
|
|
btrfs_free_path(path);
|
|
btrfs_free_path(dst_path);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Check if we must fallback to a transaction commit when logging an inode.
|
|
* This must be called after logging the inode and is used only in the context
|
|
* when fsyncing an inode requires the need to log some other inode - in which
|
|
* case we can't lock the i_mutex of each other inode we need to log as that
|
|
* can lead to deadlocks with concurrent fsync against other inodes (as we can
|
|
* log inodes up or down in the hierarchy) or rename operations for example. So
|
|
* we take the log_mutex of the inode after we have logged it and then check for
|
|
* its last_unlink_trans value - this is safe because any task setting
|
|
* last_unlink_trans must take the log_mutex and it must do this before it does
|
|
* the actual unlink operation, so if we do this check before a concurrent task
|
|
* sets last_unlink_trans it means we've logged a consistent version/state of
|
|
* all the inode items, otherwise we are not sure and must do a transaction
|
|
* commit (the concurrent task might have only updated last_unlink_trans before
|
|
* we logged the inode or it might have also done the unlink).
|
|
*/
|
|
static bool btrfs_must_commit_transaction(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
bool ret = false;
|
|
|
|
mutex_lock(&inode->log_mutex);
|
|
if (inode->last_unlink_trans >= trans->transid) {
|
|
/*
|
|
* Make sure any commits to the log are forced to be full
|
|
* commits.
|
|
*/
|
|
btrfs_set_log_full_commit(trans);
|
|
ret = true;
|
|
}
|
|
mutex_unlock(&inode->log_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* follow the dentry parent pointers up the chain and see if any
|
|
* of the directories in it require a full commit before they can
|
|
* be logged. Returns zero if nothing special needs to be done or 1 if
|
|
* a full commit is required.
|
|
*/
|
|
static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct dentry *parent,
|
|
struct super_block *sb)
|
|
{
|
|
int ret = 0;
|
|
struct dentry *old_parent = NULL;
|
|
|
|
/*
|
|
* for regular files, if its inode is already on disk, we don't
|
|
* have to worry about the parents at all. This is because
|
|
* we can use the last_unlink_trans field to record renames
|
|
* and other fun in this file.
|
|
*/
|
|
if (S_ISREG(inode->vfs_inode.i_mode) &&
|
|
inode->generation < trans->transid &&
|
|
inode->last_unlink_trans < trans->transid)
|
|
goto out;
|
|
|
|
if (!S_ISDIR(inode->vfs_inode.i_mode)) {
|
|
if (!parent || d_really_is_negative(parent) || sb != parent->d_sb)
|
|
goto out;
|
|
inode = BTRFS_I(d_inode(parent));
|
|
}
|
|
|
|
while (1) {
|
|
if (btrfs_must_commit_transaction(trans, inode)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
if (!parent || d_really_is_negative(parent) || sb != parent->d_sb)
|
|
break;
|
|
|
|
if (IS_ROOT(parent)) {
|
|
inode = BTRFS_I(d_inode(parent));
|
|
if (btrfs_must_commit_transaction(trans, inode))
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
parent = dget_parent(parent);
|
|
dput(old_parent);
|
|
old_parent = parent;
|
|
inode = BTRFS_I(d_inode(parent));
|
|
|
|
}
|
|
dput(old_parent);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_dir_list {
|
|
u64 ino;
|
|
struct list_head list;
|
|
};
|
|
|
|
/*
|
|
* Log the inodes of the new dentries of a directory. See log_dir_items() for
|
|
* details about the why it is needed.
|
|
* This is a recursive operation - if an existing dentry corresponds to a
|
|
* directory, that directory's new entries are logged too (same behaviour as
|
|
* ext3/4, xfs, f2fs, reiserfs, nilfs2). Note that when logging the inodes
|
|
* the dentries point to we do not lock their i_mutex, otherwise lockdep
|
|
* complains about the following circular lock dependency / possible deadlock:
|
|
*
|
|
* CPU0 CPU1
|
|
* ---- ----
|
|
* lock(&type->i_mutex_dir_key#3/2);
|
|
* lock(sb_internal#2);
|
|
* lock(&type->i_mutex_dir_key#3/2);
|
|
* lock(&sb->s_type->i_mutex_key#14);
|
|
*
|
|
* Where sb_internal is the lock (a counter that works as a lock) acquired by
|
|
* sb_start_intwrite() in btrfs_start_transaction().
|
|
* Not locking i_mutex of the inodes is still safe because:
|
|
*
|
|
* 1) For regular files we log with a mode of LOG_INODE_EXISTS. It's possible
|
|
* that while logging the inode new references (names) are added or removed
|
|
* from the inode, leaving the logged inode item with a link count that does
|
|
* not match the number of logged inode reference items. This is fine because
|
|
* at log replay time we compute the real number of links and correct the
|
|
* link count in the inode item (see replay_one_buffer() and
|
|
* link_to_fixup_dir());
|
|
*
|
|
* 2) For directories we log with a mode of LOG_INODE_ALL. It's possible that
|
|
* while logging the inode's items new items with keys BTRFS_DIR_ITEM_KEY and
|
|
* BTRFS_DIR_INDEX_KEY are added to fs/subvol tree and the logged inode item
|
|
* has a size that doesn't match the sum of the lengths of all the logged
|
|
* names. This does not result in a problem because if a dir_item key is
|
|
* logged but its matching dir_index key is not logged, at log replay time we
|
|
* don't use it to replay the respective name (see replay_one_name()). On the
|
|
* other hand if only the dir_index key ends up being logged, the respective
|
|
* name is added to the fs/subvol tree with both the dir_item and dir_index
|
|
* keys created (see replay_one_name()).
|
|
* The directory's inode item with a wrong i_size is not a problem as well,
|
|
* since we don't use it at log replay time to set the i_size in the inode
|
|
* item of the fs/subvol tree (see overwrite_item()).
|
|
*/
|
|
static int log_new_dir_dentries(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_inode *start_inode,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *log = root->log_root;
|
|
struct btrfs_path *path;
|
|
LIST_HEAD(dir_list);
|
|
struct btrfs_dir_list *dir_elem;
|
|
int ret = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
dir_elem = kmalloc(sizeof(*dir_elem), GFP_NOFS);
|
|
if (!dir_elem) {
|
|
btrfs_free_path(path);
|
|
return -ENOMEM;
|
|
}
|
|
dir_elem->ino = btrfs_ino(start_inode);
|
|
list_add_tail(&dir_elem->list, &dir_list);
|
|
|
|
while (!list_empty(&dir_list)) {
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key min_key;
|
|
int nritems;
|
|
int i;
|
|
|
|
dir_elem = list_first_entry(&dir_list, struct btrfs_dir_list,
|
|
list);
|
|
if (ret)
|
|
goto next_dir_inode;
|
|
|
|
min_key.objectid = dir_elem->ino;
|
|
min_key.type = BTRFS_DIR_ITEM_KEY;
|
|
min_key.offset = 0;
|
|
again:
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_forward(log, &min_key, path, trans->transid);
|
|
if (ret < 0) {
|
|
goto next_dir_inode;
|
|
} else if (ret > 0) {
|
|
ret = 0;
|
|
goto next_dir_inode;
|
|
}
|
|
|
|
process_leaf:
|
|
leaf = path->nodes[0];
|
|
nritems = btrfs_header_nritems(leaf);
|
|
for (i = path->slots[0]; i < nritems; i++) {
|
|
struct btrfs_dir_item *di;
|
|
struct btrfs_key di_key;
|
|
struct inode *di_inode;
|
|
struct btrfs_dir_list *new_dir_elem;
|
|
int log_mode = LOG_INODE_EXISTS;
|
|
int type;
|
|
|
|
btrfs_item_key_to_cpu(leaf, &min_key, i);
|
|
if (min_key.objectid != dir_elem->ino ||
|
|
min_key.type != BTRFS_DIR_ITEM_KEY)
|
|
goto next_dir_inode;
|
|
|
|
di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item);
|
|
type = btrfs_dir_type(leaf, di);
|
|
if (btrfs_dir_transid(leaf, di) < trans->transid &&
|
|
type != BTRFS_FT_DIR)
|
|
continue;
|
|
btrfs_dir_item_key_to_cpu(leaf, di, &di_key);
|
|
if (di_key.type == BTRFS_ROOT_ITEM_KEY)
|
|
continue;
|
|
|
|
btrfs_release_path(path);
|
|
di_inode = btrfs_iget(fs_info->sb, di_key.objectid, root);
|
|
if (IS_ERR(di_inode)) {
|
|
ret = PTR_ERR(di_inode);
|
|
goto next_dir_inode;
|
|
}
|
|
|
|
if (btrfs_inode_in_log(BTRFS_I(di_inode), trans->transid)) {
|
|
btrfs_add_delayed_iput(di_inode);
|
|
break;
|
|
}
|
|
|
|
ctx->log_new_dentries = false;
|
|
if (type == BTRFS_FT_DIR || type == BTRFS_FT_SYMLINK)
|
|
log_mode = LOG_INODE_ALL;
|
|
ret = btrfs_log_inode(trans, root, BTRFS_I(di_inode),
|
|
log_mode, ctx);
|
|
if (!ret &&
|
|
btrfs_must_commit_transaction(trans, BTRFS_I(di_inode)))
|
|
ret = 1;
|
|
btrfs_add_delayed_iput(di_inode);
|
|
if (ret)
|
|
goto next_dir_inode;
|
|
if (ctx->log_new_dentries) {
|
|
new_dir_elem = kmalloc(sizeof(*new_dir_elem),
|
|
GFP_NOFS);
|
|
if (!new_dir_elem) {
|
|
ret = -ENOMEM;
|
|
goto next_dir_inode;
|
|
}
|
|
new_dir_elem->ino = di_key.objectid;
|
|
list_add_tail(&new_dir_elem->list, &dir_list);
|
|
}
|
|
break;
|
|
}
|
|
if (i == nritems) {
|
|
ret = btrfs_next_leaf(log, path);
|
|
if (ret < 0) {
|
|
goto next_dir_inode;
|
|
} else if (ret > 0) {
|
|
ret = 0;
|
|
goto next_dir_inode;
|
|
}
|
|
goto process_leaf;
|
|
}
|
|
if (min_key.offset < (u64)-1) {
|
|
min_key.offset++;
|
|
goto again;
|
|
}
|
|
next_dir_inode:
|
|
list_del(&dir_elem->list);
|
|
kfree(dir_elem);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_log_all_parents(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct btrfs_root *root = inode->root;
|
|
const u64 ino = btrfs_ino(inode);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
path->skip_locking = 1;
|
|
path->search_commit_root = 1;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_REF_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
while (true) {
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int slot = path->slots[0];
|
|
u32 cur_offset = 0;
|
|
u32 item_size;
|
|
unsigned long ptr;
|
|
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
else if (ret > 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, slot);
|
|
/* BTRFS_INODE_EXTREF_KEY is BTRFS_INODE_REF_KEY + 1 */
|
|
if (key.objectid != ino || key.type > BTRFS_INODE_EXTREF_KEY)
|
|
break;
|
|
|
|
item_size = btrfs_item_size_nr(leaf, slot);
|
|
ptr = btrfs_item_ptr_offset(leaf, slot);
|
|
while (cur_offset < item_size) {
|
|
struct btrfs_key inode_key;
|
|
struct inode *dir_inode;
|
|
|
|
inode_key.type = BTRFS_INODE_ITEM_KEY;
|
|
inode_key.offset = 0;
|
|
|
|
if (key.type == BTRFS_INODE_EXTREF_KEY) {
|
|
struct btrfs_inode_extref *extref;
|
|
|
|
extref = (struct btrfs_inode_extref *)
|
|
(ptr + cur_offset);
|
|
inode_key.objectid = btrfs_inode_extref_parent(
|
|
leaf, extref);
|
|
cur_offset += sizeof(*extref);
|
|
cur_offset += btrfs_inode_extref_name_len(leaf,
|
|
extref);
|
|
} else {
|
|
inode_key.objectid = key.offset;
|
|
cur_offset = item_size;
|
|
}
|
|
|
|
dir_inode = btrfs_iget(fs_info->sb, inode_key.objectid,
|
|
root);
|
|
/*
|
|
* If the parent inode was deleted, return an error to
|
|
* fallback to a transaction commit. This is to prevent
|
|
* getting an inode that was moved from one parent A to
|
|
* a parent B, got its former parent A deleted and then
|
|
* it got fsync'ed, from existing at both parents after
|
|
* a log replay (and the old parent still existing).
|
|
* Example:
|
|
*
|
|
* mkdir /mnt/A
|
|
* mkdir /mnt/B
|
|
* touch /mnt/B/bar
|
|
* sync
|
|
* mv /mnt/B/bar /mnt/A/bar
|
|
* mv -T /mnt/A /mnt/B
|
|
* fsync /mnt/B/bar
|
|
* <power fail>
|
|
*
|
|
* If we ignore the old parent B which got deleted,
|
|
* after a log replay we would have file bar linked
|
|
* at both parents and the old parent B would still
|
|
* exist.
|
|
*/
|
|
if (IS_ERR(dir_inode)) {
|
|
ret = PTR_ERR(dir_inode);
|
|
goto out;
|
|
}
|
|
|
|
if (ctx)
|
|
ctx->log_new_dentries = false;
|
|
ret = btrfs_log_inode(trans, root, BTRFS_I(dir_inode),
|
|
LOG_INODE_ALL, ctx);
|
|
if (!ret &&
|
|
btrfs_must_commit_transaction(trans, BTRFS_I(dir_inode)))
|
|
ret = 1;
|
|
if (!ret && ctx && ctx->log_new_dentries)
|
|
ret = log_new_dir_dentries(trans, root,
|
|
BTRFS_I(dir_inode), ctx);
|
|
btrfs_add_delayed_iput(dir_inode);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int log_new_ancestors(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_key found_key;
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
|
|
|
|
while (true) {
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int slot = path->slots[0];
|
|
struct btrfs_key search_key;
|
|
struct inode *inode;
|
|
u64 ino;
|
|
int ret = 0;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
ino = found_key.offset;
|
|
|
|
search_key.objectid = found_key.offset;
|
|
search_key.type = BTRFS_INODE_ITEM_KEY;
|
|
search_key.offset = 0;
|
|
inode = btrfs_iget(fs_info->sb, ino, root);
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
|
|
if (BTRFS_I(inode)->generation >= trans->transid)
|
|
ret = btrfs_log_inode(trans, root, BTRFS_I(inode),
|
|
LOG_INODE_EXISTS, ctx);
|
|
btrfs_add_delayed_iput(inode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (search_key.objectid == BTRFS_FIRST_FREE_OBJECTID)
|
|
break;
|
|
|
|
search_key.type = BTRFS_INODE_REF_KEY;
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
leaf = path->nodes[0];
|
|
slot = path->slots[0];
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
return ret;
|
|
else if (ret > 0)
|
|
return -ENOENT;
|
|
leaf = path->nodes[0];
|
|
slot = path->slots[0];
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
if (found_key.objectid != search_key.objectid ||
|
|
found_key.type != BTRFS_INODE_REF_KEY)
|
|
return -ENOENT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int log_new_ancestors_fast(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct dentry *parent,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct dentry *old_parent = NULL;
|
|
struct super_block *sb = inode->vfs_inode.i_sb;
|
|
int ret = 0;
|
|
|
|
while (true) {
|
|
if (!parent || d_really_is_negative(parent) ||
|
|
sb != parent->d_sb)
|
|
break;
|
|
|
|
inode = BTRFS_I(d_inode(parent));
|
|
if (root != inode->root)
|
|
break;
|
|
|
|
if (inode->generation >= trans->transid) {
|
|
ret = btrfs_log_inode(trans, root, inode,
|
|
LOG_INODE_EXISTS, ctx);
|
|
if (ret)
|
|
break;
|
|
}
|
|
if (IS_ROOT(parent))
|
|
break;
|
|
|
|
parent = dget_parent(parent);
|
|
dput(old_parent);
|
|
old_parent = parent;
|
|
}
|
|
dput(old_parent);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int log_all_new_ancestors(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct dentry *parent,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
const u64 ino = btrfs_ino(inode);
|
|
struct btrfs_path *path;
|
|
struct btrfs_key search_key;
|
|
int ret;
|
|
|
|
/*
|
|
* For a single hard link case, go through a fast path that does not
|
|
* need to iterate the fs/subvolume tree.
|
|
*/
|
|
if (inode->vfs_inode.i_nlink < 2)
|
|
return log_new_ancestors_fast(trans, inode, parent, ctx);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
search_key.objectid = ino;
|
|
search_key.type = BTRFS_INODE_REF_KEY;
|
|
search_key.offset = 0;
|
|
again:
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret == 0)
|
|
path->slots[0]++;
|
|
|
|
while (true) {
|
|
struct extent_buffer *leaf = path->nodes[0];
|
|
int slot = path->slots[0];
|
|
struct btrfs_key found_key;
|
|
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
else if (ret > 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
if (found_key.objectid != ino ||
|
|
found_key.type > BTRFS_INODE_EXTREF_KEY)
|
|
break;
|
|
|
|
/*
|
|
* Don't deal with extended references because they are rare
|
|
* cases and too complex to deal with (we would need to keep
|
|
* track of which subitem we are processing for each item in
|
|
* this loop, etc). So just return some error to fallback to
|
|
* a transaction commit.
|
|
*/
|
|
if (found_key.type == BTRFS_INODE_EXTREF_KEY) {
|
|
ret = -EMLINK;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Logging ancestors needs to do more searches on the fs/subvol
|
|
* tree, so it releases the path as needed to avoid deadlocks.
|
|
* Keep track of the last inode ref key and resume from that key
|
|
* after logging all new ancestors for the current hard link.
|
|
*/
|
|
memcpy(&search_key, &found_key, sizeof(search_key));
|
|
|
|
ret = log_new_ancestors(trans, root, path, ctx);
|
|
if (ret)
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
goto again;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper function around btrfs_log_inode to make sure newly created
|
|
* parent directories also end up in the log. A minimal inode and backref
|
|
* only logging is done of any parent directories that are older than
|
|
* the last committed transaction
|
|
*/
|
|
static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode,
|
|
struct dentry *parent,
|
|
int inode_only,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct super_block *sb;
|
|
int ret = 0;
|
|
bool log_dentries = false;
|
|
|
|
sb = inode->vfs_inode.i_sb;
|
|
|
|
if (btrfs_test_opt(fs_info, NOTREELOG)) {
|
|
ret = 1;
|
|
goto end_no_trans;
|
|
}
|
|
|
|
if (btrfs_root_refs(&root->root_item) == 0) {
|
|
ret = 1;
|
|
goto end_no_trans;
|
|
}
|
|
|
|
ret = check_parent_dirs_for_sync(trans, inode, parent, sb);
|
|
if (ret)
|
|
goto end_no_trans;
|
|
|
|
/*
|
|
* Skip already logged inodes or inodes corresponding to tmpfiles
|
|
* (since logging them is pointless, a link count of 0 means they
|
|
* will never be accessible).
|
|
*/
|
|
if (btrfs_inode_in_log(inode, trans->transid) ||
|
|
inode->vfs_inode.i_nlink == 0) {
|
|
ret = BTRFS_NO_LOG_SYNC;
|
|
goto end_no_trans;
|
|
}
|
|
|
|
ret = start_log_trans(trans, root, ctx);
|
|
if (ret)
|
|
goto end_no_trans;
|
|
|
|
ret = btrfs_log_inode(trans, root, inode, inode_only, ctx);
|
|
if (ret)
|
|
goto end_trans;
|
|
|
|
/*
|
|
* for regular files, if its inode is already on disk, we don't
|
|
* have to worry about the parents at all. This is because
|
|
* we can use the last_unlink_trans field to record renames
|
|
* and other fun in this file.
|
|
*/
|
|
if (S_ISREG(inode->vfs_inode.i_mode) &&
|
|
inode->generation < trans->transid &&
|
|
inode->last_unlink_trans < trans->transid) {
|
|
ret = 0;
|
|
goto end_trans;
|
|
}
|
|
|
|
if (S_ISDIR(inode->vfs_inode.i_mode) && ctx && ctx->log_new_dentries)
|
|
log_dentries = true;
|
|
|
|
/*
|
|
* On unlink we must make sure all our current and old parent directory
|
|
* inodes are fully logged. This is to prevent leaving dangling
|
|
* directory index entries in directories that were our parents but are
|
|
* not anymore. Not doing this results in old parent directory being
|
|
* impossible to delete after log replay (rmdir will always fail with
|
|
* error -ENOTEMPTY).
|
|
*
|
|
* Example 1:
|
|
*
|
|
* mkdir testdir
|
|
* touch testdir/foo
|
|
* ln testdir/foo testdir/bar
|
|
* sync
|
|
* unlink testdir/bar
|
|
* xfs_io -c fsync testdir/foo
|
|
* <power failure>
|
|
* mount fs, triggers log replay
|
|
*
|
|
* If we don't log the parent directory (testdir), after log replay the
|
|
* directory still has an entry pointing to the file inode using the bar
|
|
* name, but a matching BTRFS_INODE_[REF|EXTREF]_KEY does not exist and
|
|
* the file inode has a link count of 1.
|
|
*
|
|
* Example 2:
|
|
*
|
|
* mkdir testdir
|
|
* touch foo
|
|
* ln foo testdir/foo2
|
|
* ln foo testdir/foo3
|
|
* sync
|
|
* unlink testdir/foo3
|
|
* xfs_io -c fsync foo
|
|
* <power failure>
|
|
* mount fs, triggers log replay
|
|
*
|
|
* Similar as the first example, after log replay the parent directory
|
|
* testdir still has an entry pointing to the inode file with name foo3
|
|
* but the file inode does not have a matching BTRFS_INODE_REF_KEY item
|
|
* and has a link count of 2.
|
|
*/
|
|
if (inode->last_unlink_trans >= trans->transid) {
|
|
ret = btrfs_log_all_parents(trans, inode, ctx);
|
|
if (ret)
|
|
goto end_trans;
|
|
}
|
|
|
|
ret = log_all_new_ancestors(trans, inode, parent, ctx);
|
|
if (ret)
|
|
goto end_trans;
|
|
|
|
if (log_dentries)
|
|
ret = log_new_dir_dentries(trans, root, inode, ctx);
|
|
else
|
|
ret = 0;
|
|
end_trans:
|
|
if (ret < 0) {
|
|
btrfs_set_log_full_commit(trans);
|
|
ret = 1;
|
|
}
|
|
|
|
if (ret)
|
|
btrfs_remove_log_ctx(root, ctx);
|
|
btrfs_end_log_trans(root);
|
|
end_no_trans:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* it is not safe to log dentry if the chunk root has added new
|
|
* chunks. This returns 0 if the dentry was logged, and 1 otherwise.
|
|
* If this returns 1, you must commit the transaction to safely get your
|
|
* data on disk.
|
|
*/
|
|
int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
|
|
struct dentry *dentry,
|
|
struct btrfs_log_ctx *ctx)
|
|
{
|
|
struct dentry *parent = dget_parent(dentry);
|
|
int ret;
|
|
|
|
ret = btrfs_log_inode_parent(trans, BTRFS_I(d_inode(dentry)), parent,
|
|
LOG_INODE_ALL, ctx);
|
|
dput(parent);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* should be called during mount to recover any replay any log trees
|
|
* from the FS
|
|
*/
|
|
int btrfs_recover_log_trees(struct btrfs_root *log_root_tree)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_root *log;
|
|
struct btrfs_fs_info *fs_info = log_root_tree->fs_info;
|
|
struct walk_control wc = {
|
|
.process_func = process_one_buffer,
|
|
.stage = LOG_WALK_PIN_ONLY,
|
|
};
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
set_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags);
|
|
|
|
trans = btrfs_start_transaction(fs_info->tree_root, 0);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto error;
|
|
}
|
|
|
|
wc.trans = trans;
|
|
wc.pin = 1;
|
|
|
|
ret = walk_log_tree(trans, log_root_tree, &wc);
|
|
if (ret) {
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"Failed to pin buffers while recovering log root tree.");
|
|
goto error;
|
|
}
|
|
|
|
again:
|
|
key.objectid = BTRFS_TREE_LOG_OBJECTID;
|
|
key.offset = (u64)-1;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0);
|
|
|
|
if (ret < 0) {
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"Couldn't find tree log root.");
|
|
goto error;
|
|
}
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
}
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
|
|
path->slots[0]);
|
|
btrfs_release_path(path);
|
|
if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID)
|
|
break;
|
|
|
|
log = btrfs_read_tree_root(log_root_tree, &found_key);
|
|
if (IS_ERR(log)) {
|
|
ret = PTR_ERR(log);
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"Couldn't read tree log root.");
|
|
goto error;
|
|
}
|
|
|
|
wc.replay_dest = btrfs_get_fs_root(fs_info, found_key.offset,
|
|
true);
|
|
if (IS_ERR(wc.replay_dest)) {
|
|
ret = PTR_ERR(wc.replay_dest);
|
|
|
|
/*
|
|
* We didn't find the subvol, likely because it was
|
|
* deleted. This is ok, simply skip this log and go to
|
|
* the next one.
|
|
*
|
|
* We need to exclude the root because we can't have
|
|
* other log replays overwriting this log as we'll read
|
|
* it back in a few more times. This will keep our
|
|
* block from being modified, and we'll just bail for
|
|
* each subsequent pass.
|
|
*/
|
|
if (ret == -ENOENT)
|
|
ret = btrfs_pin_extent_for_log_replay(trans,
|
|
log->node->start,
|
|
log->node->len);
|
|
btrfs_put_root(log);
|
|
|
|
if (!ret)
|
|
goto next;
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"Couldn't read target root for tree log recovery.");
|
|
goto error;
|
|
}
|
|
|
|
wc.replay_dest->log_root = log;
|
|
btrfs_record_root_in_trans(trans, wc.replay_dest);
|
|
ret = walk_log_tree(trans, log, &wc);
|
|
|
|
if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) {
|
|
ret = fixup_inode_link_counts(trans, wc.replay_dest,
|
|
path);
|
|
}
|
|
|
|
if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) {
|
|
struct btrfs_root *root = wc.replay_dest;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* We have just replayed everything, and the highest
|
|
* objectid of fs roots probably has changed in case
|
|
* some inode_item's got replayed.
|
|
*
|
|
* root->objectid_mutex is not acquired as log replay
|
|
* could only happen during mount.
|
|
*/
|
|
ret = btrfs_find_highest_objectid(root,
|
|
&root->highest_objectid);
|
|
}
|
|
|
|
wc.replay_dest->log_root = NULL;
|
|
btrfs_put_root(wc.replay_dest);
|
|
btrfs_put_root(log);
|
|
|
|
if (ret)
|
|
goto error;
|
|
next:
|
|
if (found_key.offset == 0)
|
|
break;
|
|
key.offset = found_key.offset - 1;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/* step one is to pin it all, step two is to replay just inodes */
|
|
if (wc.pin) {
|
|
wc.pin = 0;
|
|
wc.process_func = replay_one_buffer;
|
|
wc.stage = LOG_WALK_REPLAY_INODES;
|
|
goto again;
|
|
}
|
|
/* step three is to replay everything */
|
|
if (wc.stage < LOG_WALK_REPLAY_ALL) {
|
|
wc.stage++;
|
|
goto again;
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
|
|
/* step 4: commit the transaction, which also unpins the blocks */
|
|
ret = btrfs_commit_transaction(trans);
|
|
if (ret)
|
|
return ret;
|
|
|
|
log_root_tree->log_root = NULL;
|
|
clear_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags);
|
|
btrfs_put_root(log_root_tree);
|
|
|
|
return 0;
|
|
error:
|
|
if (wc.trans)
|
|
btrfs_end_transaction(wc.trans);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* there are some corner cases where we want to force a full
|
|
* commit instead of allowing a directory to be logged.
|
|
*
|
|
* They revolve around files there were unlinked from the directory, and
|
|
* this function updates the parent directory so that a full commit is
|
|
* properly done if it is fsync'd later after the unlinks are done.
|
|
*
|
|
* Must be called before the unlink operations (updates to the subvolume tree,
|
|
* inodes, etc) are done.
|
|
*/
|
|
void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *dir, struct btrfs_inode *inode,
|
|
int for_rename)
|
|
{
|
|
/*
|
|
* when we're logging a file, if it hasn't been renamed
|
|
* or unlinked, and its inode is fully committed on disk,
|
|
* we don't have to worry about walking up the directory chain
|
|
* to log its parents.
|
|
*
|
|
* So, we use the last_unlink_trans field to put this transid
|
|
* into the file. When the file is logged we check it and
|
|
* don't log the parents if the file is fully on disk.
|
|
*/
|
|
mutex_lock(&inode->log_mutex);
|
|
inode->last_unlink_trans = trans->transid;
|
|
mutex_unlock(&inode->log_mutex);
|
|
|
|
/*
|
|
* if this directory was already logged any new
|
|
* names for this file/dir will get recorded
|
|
*/
|
|
if (dir->logged_trans == trans->transid)
|
|
return;
|
|
|
|
/*
|
|
* if the inode we're about to unlink was logged,
|
|
* the log will be properly updated for any new names
|
|
*/
|
|
if (inode->logged_trans == trans->transid)
|
|
return;
|
|
|
|
/*
|
|
* when renaming files across directories, if the directory
|
|
* there we're unlinking from gets fsync'd later on, there's
|
|
* no way to find the destination directory later and fsync it
|
|
* properly. So, we have to be conservative and force commits
|
|
* so the new name gets discovered.
|
|
*/
|
|
if (for_rename)
|
|
goto record;
|
|
|
|
/* we can safely do the unlink without any special recording */
|
|
return;
|
|
|
|
record:
|
|
mutex_lock(&dir->log_mutex);
|
|
dir->last_unlink_trans = trans->transid;
|
|
mutex_unlock(&dir->log_mutex);
|
|
}
|
|
|
|
/*
|
|
* Make sure that if someone attempts to fsync the parent directory of a deleted
|
|
* snapshot, it ends up triggering a transaction commit. This is to guarantee
|
|
* that after replaying the log tree of the parent directory's root we will not
|
|
* see the snapshot anymore and at log replay time we will not see any log tree
|
|
* corresponding to the deleted snapshot's root, which could lead to replaying
|
|
* it after replaying the log tree of the parent directory (which would replay
|
|
* the snapshot delete operation).
|
|
*
|
|
* Must be called before the actual snapshot destroy operation (updates to the
|
|
* parent root and tree of tree roots trees, etc) are done.
|
|
*/
|
|
void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *dir)
|
|
{
|
|
mutex_lock(&dir->log_mutex);
|
|
dir->last_unlink_trans = trans->transid;
|
|
mutex_unlock(&dir->log_mutex);
|
|
}
|
|
|
|
/*
|
|
* Call this after adding a new name for a file and it will properly
|
|
* update the log to reflect the new name.
|
|
*/
|
|
void btrfs_log_new_name(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode, struct btrfs_inode *old_dir,
|
|
struct dentry *parent)
|
|
{
|
|
struct btrfs_log_ctx ctx;
|
|
|
|
/*
|
|
* this will force the logging code to walk the dentry chain
|
|
* up for the file
|
|
*/
|
|
if (!S_ISDIR(inode->vfs_inode.i_mode))
|
|
inode->last_unlink_trans = trans->transid;
|
|
|
|
/*
|
|
* if this inode hasn't been logged and directory we're renaming it
|
|
* from hasn't been logged, we don't need to log it
|
|
*/
|
|
if (inode->logged_trans < trans->transid &&
|
|
(!old_dir || old_dir->logged_trans < trans->transid))
|
|
return;
|
|
|
|
btrfs_init_log_ctx(&ctx, &inode->vfs_inode);
|
|
ctx.logging_new_name = true;
|
|
/*
|
|
* We don't care about the return value. If we fail to log the new name
|
|
* then we know the next attempt to sync the log will fallback to a full
|
|
* transaction commit (due to a call to btrfs_set_log_full_commit()), so
|
|
* we don't need to worry about getting a log committed that has an
|
|
* inconsistent state after a rename operation.
|
|
*/
|
|
btrfs_log_inode_parent(trans, inode, parent, LOG_INODE_EXISTS, &ctx);
|
|
}
|
|
|