3462 lines
93 KiB
C
3462 lines
93 KiB
C
/*
|
|
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
|
|
*/
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/fs.h>
|
|
#include "reiserfs.h"
|
|
#include "acl.h"
|
|
#include "xattr.h"
|
|
#include <linux/exportfs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/unaligned.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/mpage.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/quotaops.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/aio.h>
|
|
|
|
int reiserfs_commit_write(struct file *f, struct page *page,
|
|
unsigned from, unsigned to);
|
|
|
|
void reiserfs_evict_inode(struct inode *inode)
|
|
{
|
|
/*
|
|
* We need blocks for transaction + (user+group) quota
|
|
* update (possibly delete)
|
|
*/
|
|
int jbegin_count =
|
|
JOURNAL_PER_BALANCE_CNT * 2 +
|
|
2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
|
|
struct reiserfs_transaction_handle th;
|
|
int err;
|
|
|
|
if (!inode->i_nlink && !is_bad_inode(inode))
|
|
dquot_initialize(inode);
|
|
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
if (inode->i_nlink)
|
|
goto no_delete;
|
|
|
|
/*
|
|
* The = 0 happens when we abort creating a new inode
|
|
* for some reason like lack of space..
|
|
* also handles bad_inode case
|
|
*/
|
|
if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) {
|
|
|
|
reiserfs_delete_xattrs(inode);
|
|
|
|
reiserfs_write_lock(inode->i_sb);
|
|
|
|
if (journal_begin(&th, inode->i_sb, jbegin_count))
|
|
goto out;
|
|
reiserfs_update_inode_transaction(inode);
|
|
|
|
reiserfs_discard_prealloc(&th, inode);
|
|
|
|
err = reiserfs_delete_object(&th, inode);
|
|
|
|
/*
|
|
* Do quota update inside a transaction for journaled quotas.
|
|
* We must do that after delete_object so that quota updates
|
|
* go into the same transaction as stat data deletion
|
|
*/
|
|
if (!err) {
|
|
int depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
dquot_free_inode(inode);
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
}
|
|
|
|
if (journal_end(&th))
|
|
goto out;
|
|
|
|
/*
|
|
* check return value from reiserfs_delete_object after
|
|
* ending the transaction
|
|
*/
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* all items of file are deleted, so we can remove
|
|
* "save" link
|
|
* we can't do anything about an error here
|
|
*/
|
|
remove_save_link(inode, 0 /* not truncate */);
|
|
out:
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
} else {
|
|
/* no object items are in the tree */
|
|
;
|
|
}
|
|
|
|
/* note this must go after the journal_end to prevent deadlock */
|
|
clear_inode(inode);
|
|
|
|
dquot_drop(inode);
|
|
inode->i_blocks = 0;
|
|
return;
|
|
|
|
no_delete:
|
|
clear_inode(inode);
|
|
dquot_drop(inode);
|
|
}
|
|
|
|
static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
|
|
__u32 objectid, loff_t offset, int type, int length)
|
|
{
|
|
key->version = version;
|
|
|
|
key->on_disk_key.k_dir_id = dirid;
|
|
key->on_disk_key.k_objectid = objectid;
|
|
set_cpu_key_k_offset(key, offset);
|
|
set_cpu_key_k_type(key, type);
|
|
key->key_length = length;
|
|
}
|
|
|
|
/*
|
|
* take base of inode_key (it comes from inode always) (dirid, objectid)
|
|
* and version from an inode, set offset and type of key
|
|
*/
|
|
void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
|
|
int type, int length)
|
|
{
|
|
_make_cpu_key(key, get_inode_item_key_version(inode),
|
|
le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
|
|
le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
|
|
length);
|
|
}
|
|
|
|
/* when key is 0, do not set version and short key */
|
|
inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
|
|
int version,
|
|
loff_t offset, int type, int length,
|
|
int entry_count /*or ih_free_space */ )
|
|
{
|
|
if (key) {
|
|
ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
|
|
ih->ih_key.k_objectid =
|
|
cpu_to_le32(key->on_disk_key.k_objectid);
|
|
}
|
|
put_ih_version(ih, version);
|
|
set_le_ih_k_offset(ih, offset);
|
|
set_le_ih_k_type(ih, type);
|
|
put_ih_item_len(ih, length);
|
|
/* set_ih_free_space (ih, 0); */
|
|
/*
|
|
* for directory items it is entry count, for directs and stat
|
|
* datas - 0xffff, for indirects - 0
|
|
*/
|
|
put_ih_entry_count(ih, entry_count);
|
|
}
|
|
|
|
/*
|
|
* FIXME: we might cache recently accessed indirect item
|
|
* Ugh. Not too eager for that....
|
|
* I cut the code until such time as I see a convincing argument (benchmark).
|
|
* I don't want a bloated inode struct..., and I don't like code complexity....
|
|
*/
|
|
|
|
/*
|
|
* cutting the code is fine, since it really isn't in use yet and is easy
|
|
* to add back in. But, Vladimir has a really good idea here. Think
|
|
* about what happens for reading a file. For each page,
|
|
* The VFS layer calls reiserfs_readpage, who searches the tree to find
|
|
* an indirect item. This indirect item has X number of pointers, where
|
|
* X is a big number if we've done the block allocation right. But,
|
|
* we only use one or two of these pointers during each call to readpage,
|
|
* needlessly researching again later on.
|
|
*
|
|
* The size of the cache could be dynamic based on the size of the file.
|
|
*
|
|
* I'd also like to see us cache the location the stat data item, since
|
|
* we are needlessly researching for that frequently.
|
|
*
|
|
* --chris
|
|
*/
|
|
|
|
/*
|
|
* If this page has a file tail in it, and
|
|
* it was read in by get_block_create_0, the page data is valid,
|
|
* but tail is still sitting in a direct item, and we can't write to
|
|
* it. So, look through this page, and check all the mapped buffers
|
|
* to make sure they have valid block numbers. Any that don't need
|
|
* to be unmapped, so that __block_write_begin will correctly call
|
|
* reiserfs_get_block to convert the tail into an unformatted node
|
|
*/
|
|
static inline void fix_tail_page_for_writing(struct page *page)
|
|
{
|
|
struct buffer_head *head, *next, *bh;
|
|
|
|
if (page && page_has_buffers(page)) {
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
next = bh->b_this_page;
|
|
if (buffer_mapped(bh) && bh->b_blocknr == 0) {
|
|
reiserfs_unmap_buffer(bh);
|
|
}
|
|
bh = next;
|
|
} while (bh != head);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* reiserfs_get_block does not need to allocate a block only if it has been
|
|
* done already or non-hole position has been found in the indirect item
|
|
*/
|
|
static inline int allocation_needed(int retval, b_blocknr_t allocated,
|
|
struct item_head *ih,
|
|
__le32 * item, int pos_in_item)
|
|
{
|
|
if (allocated)
|
|
return 0;
|
|
if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
|
|
get_block_num(item, pos_in_item))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static inline int indirect_item_found(int retval, struct item_head *ih)
|
|
{
|
|
return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
|
|
}
|
|
|
|
static inline void set_block_dev_mapped(struct buffer_head *bh,
|
|
b_blocknr_t block, struct inode *inode)
|
|
{
|
|
map_bh(bh, inode->i_sb, block);
|
|
}
|
|
|
|
/*
|
|
* files which were created in the earlier version can not be longer,
|
|
* than 2 gb
|
|
*/
|
|
static int file_capable(struct inode *inode, sector_t block)
|
|
{
|
|
/* it is new file. */
|
|
if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 ||
|
|
/* old file, but 'block' is inside of 2gb */
|
|
block < (1 << (31 - inode->i_sb->s_blocksize_bits)))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int restart_transaction(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode, struct treepath *path)
|
|
{
|
|
struct super_block *s = th->t_super;
|
|
int err;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
BUG_ON(!th->t_refcount);
|
|
|
|
pathrelse(path);
|
|
|
|
/* we cannot restart while nested */
|
|
if (th->t_refcount > 1) {
|
|
return 0;
|
|
}
|
|
reiserfs_update_sd(th, inode);
|
|
err = journal_end(th);
|
|
if (!err) {
|
|
err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
|
|
if (!err)
|
|
reiserfs_update_inode_transaction(inode);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* it is called by get_block when create == 0. Returns block number
|
|
* for 'block'-th logical block of file. When it hits direct item it
|
|
* returns 0 (being called from bmap) or read direct item into piece
|
|
* of page (bh_result)
|
|
* Please improve the english/clarity in the comment above, as it is
|
|
* hard to understand.
|
|
*/
|
|
static int _get_block_create_0(struct inode *inode, sector_t block,
|
|
struct buffer_head *bh_result, int args)
|
|
{
|
|
INITIALIZE_PATH(path);
|
|
struct cpu_key key;
|
|
struct buffer_head *bh;
|
|
struct item_head *ih, tmp_ih;
|
|
b_blocknr_t blocknr;
|
|
char *p = NULL;
|
|
int chars;
|
|
int ret;
|
|
int result;
|
|
int done = 0;
|
|
unsigned long offset;
|
|
|
|
/* prepare the key to look for the 'block'-th block of file */
|
|
make_cpu_key(&key, inode,
|
|
(loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
|
|
3);
|
|
|
|
result = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (result != POSITION_FOUND) {
|
|
pathrelse(&path);
|
|
if (p)
|
|
kunmap(bh_result->b_page);
|
|
if (result == IO_ERROR)
|
|
return -EIO;
|
|
/*
|
|
* We do not return -ENOENT if there is a hole but page is
|
|
* uptodate, because it means that there is some MMAPED data
|
|
* associated with it that is yet to be written to disk.
|
|
*/
|
|
if ((args & GET_BLOCK_NO_HOLE)
|
|
&& !PageUptodate(bh_result->b_page)) {
|
|
return -ENOENT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bh = get_last_bh(&path);
|
|
ih = tp_item_head(&path);
|
|
if (is_indirect_le_ih(ih)) {
|
|
__le32 *ind_item = (__le32 *) ih_item_body(bh, ih);
|
|
|
|
/*
|
|
* FIXME: here we could cache indirect item or part of it in
|
|
* the inode to avoid search_by_key in case of subsequent
|
|
* access to file
|
|
*/
|
|
blocknr = get_block_num(ind_item, path.pos_in_item);
|
|
ret = 0;
|
|
if (blocknr) {
|
|
map_bh(bh_result, inode->i_sb, blocknr);
|
|
if (path.pos_in_item ==
|
|
((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
|
|
set_buffer_boundary(bh_result);
|
|
}
|
|
} else
|
|
/*
|
|
* We do not return -ENOENT if there is a hole but
|
|
* page is uptodate, because it means that there is
|
|
* some MMAPED data associated with it that is
|
|
* yet to be written to disk.
|
|
*/
|
|
if ((args & GET_BLOCK_NO_HOLE)
|
|
&& !PageUptodate(bh_result->b_page)) {
|
|
ret = -ENOENT;
|
|
}
|
|
|
|
pathrelse(&path);
|
|
if (p)
|
|
kunmap(bh_result->b_page);
|
|
return ret;
|
|
}
|
|
/* requested data are in direct item(s) */
|
|
if (!(args & GET_BLOCK_READ_DIRECT)) {
|
|
/*
|
|
* we are called by bmap. FIXME: we can not map block of file
|
|
* when it is stored in direct item(s)
|
|
*/
|
|
pathrelse(&path);
|
|
if (p)
|
|
kunmap(bh_result->b_page);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* if we've got a direct item, and the buffer or page was uptodate,
|
|
* we don't want to pull data off disk again. skip to the
|
|
* end, where we map the buffer and return
|
|
*/
|
|
if (buffer_uptodate(bh_result)) {
|
|
goto finished;
|
|
} else
|
|
/*
|
|
* grab_tail_page can trigger calls to reiserfs_get_block on
|
|
* up to date pages without any buffers. If the page is up
|
|
* to date, we don't want read old data off disk. Set the up
|
|
* to date bit on the buffer instead and jump to the end
|
|
*/
|
|
if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
|
|
set_buffer_uptodate(bh_result);
|
|
goto finished;
|
|
}
|
|
/* read file tail into part of page */
|
|
offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
|
|
copy_item_head(&tmp_ih, ih);
|
|
|
|
/*
|
|
* we only want to kmap if we are reading the tail into the page.
|
|
* this is not the common case, so we don't kmap until we are
|
|
* sure we need to. But, this means the item might move if
|
|
* kmap schedules
|
|
*/
|
|
if (!p)
|
|
p = (char *)kmap(bh_result->b_page);
|
|
|
|
p += offset;
|
|
memset(p, 0, inode->i_sb->s_blocksize);
|
|
do {
|
|
if (!is_direct_le_ih(ih)) {
|
|
BUG();
|
|
}
|
|
/*
|
|
* make sure we don't read more bytes than actually exist in
|
|
* the file. This can happen in odd cases where i_size isn't
|
|
* correct, and when direct item padding results in a few
|
|
* extra bytes at the end of the direct item
|
|
*/
|
|
if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
|
|
break;
|
|
if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
|
|
chars =
|
|
inode->i_size - (le_ih_k_offset(ih) - 1) -
|
|
path.pos_in_item;
|
|
done = 1;
|
|
} else {
|
|
chars = ih_item_len(ih) - path.pos_in_item;
|
|
}
|
|
memcpy(p, ih_item_body(bh, ih) + path.pos_in_item, chars);
|
|
|
|
if (done)
|
|
break;
|
|
|
|
p += chars;
|
|
|
|
/*
|
|
* we done, if read direct item is not the last item of
|
|
* node FIXME: we could try to check right delimiting key
|
|
* to see whether direct item continues in the right
|
|
* neighbor or rely on i_size
|
|
*/
|
|
if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
|
|
break;
|
|
|
|
/* update key to look for the next piece */
|
|
set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
|
|
result = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (result != POSITION_FOUND)
|
|
/* i/o error most likely */
|
|
break;
|
|
bh = get_last_bh(&path);
|
|
ih = tp_item_head(&path);
|
|
} while (1);
|
|
|
|
flush_dcache_page(bh_result->b_page);
|
|
kunmap(bh_result->b_page);
|
|
|
|
finished:
|
|
pathrelse(&path);
|
|
|
|
if (result == IO_ERROR)
|
|
return -EIO;
|
|
|
|
/*
|
|
* this buffer has valid data, but isn't valid for io. mapping it to
|
|
* block #0 tells the rest of reiserfs it just has a tail in it
|
|
*/
|
|
map_bh(bh_result, inode->i_sb, 0);
|
|
set_buffer_uptodate(bh_result);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this is called to create file map. So, _get_block_create_0 will not
|
|
* read direct item
|
|
*/
|
|
static int reiserfs_bmap(struct inode *inode, sector_t block,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
if (!file_capable(inode, block))
|
|
return -EFBIG;
|
|
|
|
reiserfs_write_lock(inode->i_sb);
|
|
/* do not read the direct item */
|
|
_get_block_create_0(inode, block, bh_result, 0);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* special version of get_block that is only used by grab_tail_page right
|
|
* now. It is sent to __block_write_begin, and when you try to get a
|
|
* block past the end of the file (or a block from a hole) it returns
|
|
* -ENOENT instead of a valid buffer. __block_write_begin expects to
|
|
* be able to do i/o on the buffers returned, unless an error value
|
|
* is also returned.
|
|
*
|
|
* So, this allows __block_write_begin to be used for reading a single block
|
|
* in a page. Where it does not produce a valid page for holes, or past the
|
|
* end of the file. This turns out to be exactly what we need for reading
|
|
* tails for conversion.
|
|
*
|
|
* The point of the wrapper is forcing a certain value for create, even
|
|
* though the VFS layer is calling this function with create==1. If you
|
|
* don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
|
|
* don't use this function.
|
|
*/
|
|
static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
|
|
struct buffer_head *bh_result,
|
|
int create)
|
|
{
|
|
return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
|
|
}
|
|
|
|
/*
|
|
* This is special helper for reiserfs_get_block in case we are executing
|
|
* direct_IO request.
|
|
*/
|
|
static int reiserfs_get_blocks_direct_io(struct inode *inode,
|
|
sector_t iblock,
|
|
struct buffer_head *bh_result,
|
|
int create)
|
|
{
|
|
int ret;
|
|
|
|
bh_result->b_page = NULL;
|
|
|
|
/*
|
|
* We set the b_size before reiserfs_get_block call since it is
|
|
* referenced in convert_tail_for_hole() that may be called from
|
|
* reiserfs_get_block()
|
|
*/
|
|
bh_result->b_size = (1 << inode->i_blkbits);
|
|
|
|
ret = reiserfs_get_block(inode, iblock, bh_result,
|
|
create | GET_BLOCK_NO_DANGLE);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* don't allow direct io onto tail pages */
|
|
if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
|
|
/*
|
|
* make sure future calls to the direct io funcs for this
|
|
* offset in the file fail by unmapping the buffer
|
|
*/
|
|
clear_buffer_mapped(bh_result);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Possible unpacked tail. Flush the data before pages have
|
|
* disappeared
|
|
*/
|
|
if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
|
|
int err;
|
|
|
|
reiserfs_write_lock(inode->i_sb);
|
|
|
|
err = reiserfs_commit_for_inode(inode);
|
|
REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
if (err < 0)
|
|
ret = err;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper function for when reiserfs_get_block is called for a hole
|
|
* but the file tail is still in a direct item
|
|
* bh_result is the buffer head for the hole
|
|
* tail_offset is the offset of the start of the tail in the file
|
|
*
|
|
* This calls prepare_write, which will start a new transaction
|
|
* you should not be in a transaction, or have any paths held when you
|
|
* call this.
|
|
*/
|
|
static int convert_tail_for_hole(struct inode *inode,
|
|
struct buffer_head *bh_result,
|
|
loff_t tail_offset)
|
|
{
|
|
unsigned long index;
|
|
unsigned long tail_end;
|
|
unsigned long tail_start;
|
|
struct page *tail_page;
|
|
struct page *hole_page = bh_result->b_page;
|
|
int retval = 0;
|
|
|
|
if ((tail_offset & (bh_result->b_size - 1)) != 1)
|
|
return -EIO;
|
|
|
|
/* always try to read until the end of the block */
|
|
tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
|
|
tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
|
|
|
|
index = tail_offset >> PAGE_CACHE_SHIFT;
|
|
/*
|
|
* hole_page can be zero in case of direct_io, we are sure
|
|
* that we cannot get here if we write with O_DIRECT into tail page
|
|
*/
|
|
if (!hole_page || index != hole_page->index) {
|
|
tail_page = grab_cache_page(inode->i_mapping, index);
|
|
retval = -ENOMEM;
|
|
if (!tail_page) {
|
|
goto out;
|
|
}
|
|
} else {
|
|
tail_page = hole_page;
|
|
}
|
|
|
|
/*
|
|
* we don't have to make sure the conversion did not happen while
|
|
* we were locking the page because anyone that could convert
|
|
* must first take i_mutex.
|
|
*
|
|
* We must fix the tail page for writing because it might have buffers
|
|
* that are mapped, but have a block number of 0. This indicates tail
|
|
* data that has been read directly into the page, and
|
|
* __block_write_begin won't trigger a get_block in this case.
|
|
*/
|
|
fix_tail_page_for_writing(tail_page);
|
|
retval = __reiserfs_write_begin(tail_page, tail_start,
|
|
tail_end - tail_start);
|
|
if (retval)
|
|
goto unlock;
|
|
|
|
/* tail conversion might change the data in the page */
|
|
flush_dcache_page(tail_page);
|
|
|
|
retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
|
|
|
|
unlock:
|
|
if (tail_page != hole_page) {
|
|
unlock_page(tail_page);
|
|
page_cache_release(tail_page);
|
|
}
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static inline int _allocate_block(struct reiserfs_transaction_handle *th,
|
|
sector_t block,
|
|
struct inode *inode,
|
|
b_blocknr_t * allocated_block_nr,
|
|
struct treepath *path, int flags)
|
|
{
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
#ifdef REISERFS_PREALLOCATE
|
|
if (!(flags & GET_BLOCK_NO_IMUX)) {
|
|
return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
|
|
path, block);
|
|
}
|
|
#endif
|
|
return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
|
|
block);
|
|
}
|
|
|
|
int reiserfs_get_block(struct inode *inode, sector_t block,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
int repeat, retval = 0;
|
|
/* b_blocknr_t is (unsigned) 32 bit int*/
|
|
b_blocknr_t allocated_block_nr = 0;
|
|
INITIALIZE_PATH(path);
|
|
int pos_in_item;
|
|
struct cpu_key key;
|
|
struct buffer_head *bh, *unbh = NULL;
|
|
struct item_head *ih, tmp_ih;
|
|
__le32 *item;
|
|
int done;
|
|
int fs_gen;
|
|
struct reiserfs_transaction_handle *th = NULL;
|
|
/*
|
|
* space reserved in transaction batch:
|
|
* . 3 balancings in direct->indirect conversion
|
|
* . 1 block involved into reiserfs_update_sd()
|
|
* XXX in practically impossible worst case direct2indirect()
|
|
* can incur (much) more than 3 balancings.
|
|
* quota update for user, group
|
|
*/
|
|
int jbegin_count =
|
|
JOURNAL_PER_BALANCE_CNT * 3 + 1 +
|
|
2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
|
|
int version;
|
|
int dangle = 1;
|
|
loff_t new_offset =
|
|
(((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
|
|
|
|
reiserfs_write_lock(inode->i_sb);
|
|
version = get_inode_item_key_version(inode);
|
|
|
|
if (!file_capable(inode, block)) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return -EFBIG;
|
|
}
|
|
|
|
/*
|
|
* if !create, we aren't changing the FS, so we don't need to
|
|
* log anything, so we don't need to start a transaction
|
|
*/
|
|
if (!(create & GET_BLOCK_CREATE)) {
|
|
int ret;
|
|
/* find number of block-th logical block of the file */
|
|
ret = _get_block_create_0(inode, block, bh_result,
|
|
create | GET_BLOCK_READ_DIRECT);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* if we're already in a transaction, make sure to close
|
|
* any new transactions we start in this func
|
|
*/
|
|
if ((create & GET_BLOCK_NO_DANGLE) ||
|
|
reiserfs_transaction_running(inode->i_sb))
|
|
dangle = 0;
|
|
|
|
/*
|
|
* If file is of such a size, that it might have a tail and
|
|
* tails are enabled we should mark it as possibly needing
|
|
* tail packing on close
|
|
*/
|
|
if ((have_large_tails(inode->i_sb)
|
|
&& inode->i_size < i_block_size(inode) * 4)
|
|
|| (have_small_tails(inode->i_sb)
|
|
&& inode->i_size < i_block_size(inode)))
|
|
REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
|
|
|
|
/* set the key of the first byte in the 'block'-th block of file */
|
|
make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
|
|
if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
|
|
start_trans:
|
|
th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
|
|
if (!th) {
|
|
retval = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
reiserfs_update_inode_transaction(inode);
|
|
}
|
|
research:
|
|
|
|
retval = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (retval == IO_ERROR) {
|
|
retval = -EIO;
|
|
goto failure;
|
|
}
|
|
|
|
bh = get_last_bh(&path);
|
|
ih = tp_item_head(&path);
|
|
item = tp_item_body(&path);
|
|
pos_in_item = path.pos_in_item;
|
|
|
|
fs_gen = get_generation(inode->i_sb);
|
|
copy_item_head(&tmp_ih, ih);
|
|
|
|
if (allocation_needed
|
|
(retval, allocated_block_nr, ih, item, pos_in_item)) {
|
|
/* we have to allocate block for the unformatted node */
|
|
if (!th) {
|
|
pathrelse(&path);
|
|
goto start_trans;
|
|
}
|
|
|
|
repeat =
|
|
_allocate_block(th, block, inode, &allocated_block_nr,
|
|
&path, create);
|
|
|
|
/*
|
|
* restart the transaction to give the journal a chance to free
|
|
* some blocks. releases the path, so we have to go back to
|
|
* research if we succeed on the second try
|
|
*/
|
|
if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
|
|
SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
|
|
retval = restart_transaction(th, inode, &path);
|
|
if (retval)
|
|
goto failure;
|
|
repeat =
|
|
_allocate_block(th, block, inode,
|
|
&allocated_block_nr, NULL, create);
|
|
|
|
if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
|
|
goto research;
|
|
}
|
|
if (repeat == QUOTA_EXCEEDED)
|
|
retval = -EDQUOT;
|
|
else
|
|
retval = -ENOSPC;
|
|
goto failure;
|
|
}
|
|
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
goto research;
|
|
}
|
|
}
|
|
|
|
if (indirect_item_found(retval, ih)) {
|
|
b_blocknr_t unfm_ptr;
|
|
/*
|
|
* 'block'-th block is in the file already (there is
|
|
* corresponding cell in some indirect item). But it may be
|
|
* zero unformatted node pointer (hole)
|
|
*/
|
|
unfm_ptr = get_block_num(item, pos_in_item);
|
|
if (unfm_ptr == 0) {
|
|
/* use allocated block to plug the hole */
|
|
reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb,
|
|
bh);
|
|
goto research;
|
|
}
|
|
set_buffer_new(bh_result);
|
|
if (buffer_dirty(bh_result)
|
|
&& reiserfs_data_ordered(inode->i_sb))
|
|
reiserfs_add_ordered_list(inode, bh_result);
|
|
put_block_num(item, pos_in_item, allocated_block_nr);
|
|
unfm_ptr = allocated_block_nr;
|
|
journal_mark_dirty(th, bh);
|
|
reiserfs_update_sd(th, inode);
|
|
}
|
|
set_block_dev_mapped(bh_result, unfm_ptr, inode);
|
|
pathrelse(&path);
|
|
retval = 0;
|
|
if (!dangle && th)
|
|
retval = reiserfs_end_persistent_transaction(th);
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
/*
|
|
* the item was found, so new blocks were not added to the file
|
|
* there is no need to make sure the inode is updated with this
|
|
* transaction
|
|
*/
|
|
return retval;
|
|
}
|
|
|
|
if (!th) {
|
|
pathrelse(&path);
|
|
goto start_trans;
|
|
}
|
|
|
|
/*
|
|
* desired position is not found or is in the direct item. We have
|
|
* to append file with holes up to 'block'-th block converting
|
|
* direct items to indirect one if necessary
|
|
*/
|
|
done = 0;
|
|
do {
|
|
if (is_statdata_le_ih(ih)) {
|
|
__le32 unp = 0;
|
|
struct cpu_key tmp_key;
|
|
|
|
/* indirect item has to be inserted */
|
|
make_le_item_head(&tmp_ih, &key, version, 1,
|
|
TYPE_INDIRECT, UNFM_P_SIZE,
|
|
0 /* free_space */ );
|
|
|
|
/*
|
|
* we are going to add 'block'-th block to the file.
|
|
* Use allocated block for that
|
|
*/
|
|
if (cpu_key_k_offset(&key) == 1) {
|
|
unp = cpu_to_le32(allocated_block_nr);
|
|
set_block_dev_mapped(bh_result,
|
|
allocated_block_nr, inode);
|
|
set_buffer_new(bh_result);
|
|
done = 1;
|
|
}
|
|
tmp_key = key; /* ;) */
|
|
set_cpu_key_k_offset(&tmp_key, 1);
|
|
PATH_LAST_POSITION(&path)++;
|
|
|
|
retval =
|
|
reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
|
|
inode, (char *)&unp);
|
|
if (retval) {
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
/*
|
|
* retval == -ENOSPC, -EDQUOT or -EIO
|
|
* or -EEXIST
|
|
*/
|
|
goto failure;
|
|
}
|
|
} else if (is_direct_le_ih(ih)) {
|
|
/* direct item has to be converted */
|
|
loff_t tail_offset;
|
|
|
|
tail_offset =
|
|
((le_ih_k_offset(ih) -
|
|
1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
|
|
|
|
/*
|
|
* direct item we just found fits into block we have
|
|
* to map. Convert it into unformatted node: use
|
|
* bh_result for the conversion
|
|
*/
|
|
if (tail_offset == cpu_key_k_offset(&key)) {
|
|
set_block_dev_mapped(bh_result,
|
|
allocated_block_nr, inode);
|
|
unbh = bh_result;
|
|
done = 1;
|
|
} else {
|
|
/*
|
|
* we have to pad file tail stored in direct
|
|
* item(s) up to block size and convert it
|
|
* to unformatted node. FIXME: this should
|
|
* also get into page cache
|
|
*/
|
|
|
|
pathrelse(&path);
|
|
/*
|
|
* ugly, but we can only end the transaction if
|
|
* we aren't nested
|
|
*/
|
|
BUG_ON(!th->t_refcount);
|
|
if (th->t_refcount == 1) {
|
|
retval =
|
|
reiserfs_end_persistent_transaction
|
|
(th);
|
|
th = NULL;
|
|
if (retval)
|
|
goto failure;
|
|
}
|
|
|
|
retval =
|
|
convert_tail_for_hole(inode, bh_result,
|
|
tail_offset);
|
|
if (retval) {
|
|
if (retval != -ENOSPC)
|
|
reiserfs_error(inode->i_sb,
|
|
"clm-6004",
|
|
"convert tail failed "
|
|
"inode %lu, error %d",
|
|
inode->i_ino,
|
|
retval);
|
|
if (allocated_block_nr) {
|
|
/*
|
|
* the bitmap, the super,
|
|
* and the stat data == 3
|
|
*/
|
|
if (!th)
|
|
th = reiserfs_persistent_transaction(inode->i_sb, 3);
|
|
if (th)
|
|
reiserfs_free_block(th,
|
|
inode,
|
|
allocated_block_nr,
|
|
1);
|
|
}
|
|
goto failure;
|
|
}
|
|
goto research;
|
|
}
|
|
retval =
|
|
direct2indirect(th, inode, &path, unbh,
|
|
tail_offset);
|
|
if (retval) {
|
|
reiserfs_unmap_buffer(unbh);
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
goto failure;
|
|
}
|
|
/*
|
|
* it is important the set_buffer_uptodate is done
|
|
* after the direct2indirect. The buffer might
|
|
* contain valid data newer than the data on disk
|
|
* (read by readpage, changed, and then sent here by
|
|
* writepage). direct2indirect needs to know if unbh
|
|
* was already up to date, so it can decide if the
|
|
* data in unbh needs to be replaced with data from
|
|
* the disk
|
|
*/
|
|
set_buffer_uptodate(unbh);
|
|
|
|
/*
|
|
* unbh->b_page == NULL in case of DIRECT_IO request,
|
|
* this means buffer will disappear shortly, so it
|
|
* should not be added to
|
|
*/
|
|
if (unbh->b_page) {
|
|
/*
|
|
* we've converted the tail, so we must
|
|
* flush unbh before the transaction commits
|
|
*/
|
|
reiserfs_add_tail_list(inode, unbh);
|
|
|
|
/*
|
|
* mark it dirty now to prevent commit_write
|
|
* from adding this buffer to the inode's
|
|
* dirty buffer list
|
|
*/
|
|
/*
|
|
* AKPM: changed __mark_buffer_dirty to
|
|
* mark_buffer_dirty(). It's still atomic,
|
|
* but it sets the page dirty too, which makes
|
|
* it eligible for writeback at any time by the
|
|
* VM (which was also the case with
|
|
* __mark_buffer_dirty())
|
|
*/
|
|
mark_buffer_dirty(unbh);
|
|
}
|
|
} else {
|
|
/*
|
|
* append indirect item with holes if needed, when
|
|
* appending pointer to 'block'-th block use block,
|
|
* which is already allocated
|
|
*/
|
|
struct cpu_key tmp_key;
|
|
/*
|
|
* We use this in case we need to allocate
|
|
* only one block which is a fastpath
|
|
*/
|
|
unp_t unf_single = 0;
|
|
unp_t *un;
|
|
__u64 max_to_insert =
|
|
MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
|
|
UNFM_P_SIZE;
|
|
__u64 blocks_needed;
|
|
|
|
RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
|
|
"vs-804: invalid position for append");
|
|
/*
|
|
* indirect item has to be appended,
|
|
* set up key of that position
|
|
* (key type is unimportant)
|
|
*/
|
|
make_cpu_key(&tmp_key, inode,
|
|
le_key_k_offset(version,
|
|
&ih->ih_key) +
|
|
op_bytes_number(ih,
|
|
inode->i_sb->s_blocksize),
|
|
TYPE_INDIRECT, 3);
|
|
|
|
RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
|
|
"green-805: invalid offset");
|
|
blocks_needed =
|
|
1 +
|
|
((cpu_key_k_offset(&key) -
|
|
cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
|
|
s_blocksize_bits);
|
|
|
|
if (blocks_needed == 1) {
|
|
un = &unf_single;
|
|
} else {
|
|
un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS);
|
|
if (!un) {
|
|
un = &unf_single;
|
|
blocks_needed = 1;
|
|
max_to_insert = 0;
|
|
}
|
|
}
|
|
if (blocks_needed <= max_to_insert) {
|
|
/*
|
|
* we are going to add target block to
|
|
* the file. Use allocated block for that
|
|
*/
|
|
un[blocks_needed - 1] =
|
|
cpu_to_le32(allocated_block_nr);
|
|
set_block_dev_mapped(bh_result,
|
|
allocated_block_nr, inode);
|
|
set_buffer_new(bh_result);
|
|
done = 1;
|
|
} else {
|
|
/* paste hole to the indirect item */
|
|
/*
|
|
* If kmalloc failed, max_to_insert becomes
|
|
* zero and it means we only have space for
|
|
* one block
|
|
*/
|
|
blocks_needed =
|
|
max_to_insert ? max_to_insert : 1;
|
|
}
|
|
retval =
|
|
reiserfs_paste_into_item(th, &path, &tmp_key, inode,
|
|
(char *)un,
|
|
UNFM_P_SIZE *
|
|
blocks_needed);
|
|
|
|
if (blocks_needed != 1)
|
|
kfree(un);
|
|
|
|
if (retval) {
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
goto failure;
|
|
}
|
|
if (!done) {
|
|
/*
|
|
* We need to mark new file size in case
|
|
* this function will be interrupted/aborted
|
|
* later on. And we may do this only for
|
|
* holes.
|
|
*/
|
|
inode->i_size +=
|
|
inode->i_sb->s_blocksize * blocks_needed;
|
|
}
|
|
}
|
|
|
|
if (done == 1)
|
|
break;
|
|
|
|
/*
|
|
* this loop could log more blocks than we had originally
|
|
* asked for. So, we have to allow the transaction to end
|
|
* if it is too big or too full. Update the inode so things
|
|
* are consistent if we crash before the function returns
|
|
* release the path so that anybody waiting on the path before
|
|
* ending their transaction will be able to continue.
|
|
*/
|
|
if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
|
|
retval = restart_transaction(th, inode, &path);
|
|
if (retval)
|
|
goto failure;
|
|
}
|
|
/*
|
|
* inserting indirect pointers for a hole can take a
|
|
* long time. reschedule if needed and also release the write
|
|
* lock for others.
|
|
*/
|
|
reiserfs_cond_resched(inode->i_sb);
|
|
|
|
retval = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (retval == IO_ERROR) {
|
|
retval = -EIO;
|
|
goto failure;
|
|
}
|
|
if (retval == POSITION_FOUND) {
|
|
reiserfs_warning(inode->i_sb, "vs-825",
|
|
"%K should not be found", &key);
|
|
retval = -EEXIST;
|
|
if (allocated_block_nr)
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
pathrelse(&path);
|
|
goto failure;
|
|
}
|
|
bh = get_last_bh(&path);
|
|
ih = tp_item_head(&path);
|
|
item = tp_item_body(&path);
|
|
pos_in_item = path.pos_in_item;
|
|
} while (1);
|
|
|
|
retval = 0;
|
|
|
|
failure:
|
|
if (th && (!dangle || (retval && !th->t_trans_id))) {
|
|
int err;
|
|
if (th->t_trans_id)
|
|
reiserfs_update_sd(th, inode);
|
|
err = reiserfs_end_persistent_transaction(th);
|
|
if (err)
|
|
retval = err;
|
|
}
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
reiserfs_check_path(&path);
|
|
return retval;
|
|
}
|
|
|
|
static int
|
|
reiserfs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
|
|
}
|
|
|
|
/*
|
|
* Compute real number of used bytes by file
|
|
* Following three functions can go away when we'll have enough space in
|
|
* stat item
|
|
*/
|
|
static int real_space_diff(struct inode *inode, int sd_size)
|
|
{
|
|
int bytes;
|
|
loff_t blocksize = inode->i_sb->s_blocksize;
|
|
|
|
if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
|
|
return sd_size;
|
|
|
|
/*
|
|
* End of file is also in full block with indirect reference, so round
|
|
* up to the next block.
|
|
*
|
|
* there is just no way to know if the tail is actually packed
|
|
* on the file, so we have to assume it isn't. When we pack the
|
|
* tail, we add 4 bytes to pretend there really is an unformatted
|
|
* node pointer
|
|
*/
|
|
bytes =
|
|
((inode->i_size +
|
|
(blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
|
|
sd_size;
|
|
return bytes;
|
|
}
|
|
|
|
static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
|
|
int sd_size)
|
|
{
|
|
if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
|
|
return inode->i_size +
|
|
(loff_t) (real_space_diff(inode, sd_size));
|
|
}
|
|
return ((loff_t) real_space_diff(inode, sd_size)) +
|
|
(((loff_t) blocks) << 9);
|
|
}
|
|
|
|
/* Compute number of blocks used by file in ReiserFS counting */
|
|
static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
|
|
{
|
|
loff_t bytes = inode_get_bytes(inode);
|
|
loff_t real_space = real_space_diff(inode, sd_size);
|
|
|
|
/* keeps fsck and non-quota versions of reiserfs happy */
|
|
if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
|
|
bytes += (loff_t) 511;
|
|
}
|
|
|
|
/*
|
|
* files from before the quota patch might i_blocks such that
|
|
* bytes < real_space. Deal with that here to prevent it from
|
|
* going negative.
|
|
*/
|
|
if (bytes < real_space)
|
|
return 0;
|
|
return (bytes - real_space) >> 9;
|
|
}
|
|
|
|
/*
|
|
* BAD: new directories have stat data of new type and all other items
|
|
* of old type. Version stored in the inode says about body items, so
|
|
* in update_stat_data we can not rely on inode, but have to check
|
|
* item version directly
|
|
*/
|
|
|
|
/* called by read_locked_inode */
|
|
static void init_inode(struct inode *inode, struct treepath *path)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct item_head *ih;
|
|
__u32 rdev;
|
|
|
|
bh = PATH_PLAST_BUFFER(path);
|
|
ih = tp_item_head(path);
|
|
|
|
copy_key(INODE_PKEY(inode), &ih->ih_key);
|
|
|
|
INIT_LIST_HEAD(&REISERFS_I(inode)->i_prealloc_list);
|
|
REISERFS_I(inode)->i_flags = 0;
|
|
REISERFS_I(inode)->i_prealloc_block = 0;
|
|
REISERFS_I(inode)->i_prealloc_count = 0;
|
|
REISERFS_I(inode)->i_trans_id = 0;
|
|
REISERFS_I(inode)->i_jl = NULL;
|
|
reiserfs_init_xattr_rwsem(inode);
|
|
|
|
if (stat_data_v1(ih)) {
|
|
struct stat_data_v1 *sd =
|
|
(struct stat_data_v1 *)ih_item_body(bh, ih);
|
|
unsigned long blocks;
|
|
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_5);
|
|
set_inode_sd_version(inode, STAT_DATA_V1);
|
|
inode->i_mode = sd_v1_mode(sd);
|
|
set_nlink(inode, sd_v1_nlink(sd));
|
|
i_uid_write(inode, sd_v1_uid(sd));
|
|
i_gid_write(inode, sd_v1_gid(sd));
|
|
inode->i_size = sd_v1_size(sd);
|
|
inode->i_atime.tv_sec = sd_v1_atime(sd);
|
|
inode->i_mtime.tv_sec = sd_v1_mtime(sd);
|
|
inode->i_ctime.tv_sec = sd_v1_ctime(sd);
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_mtime.tv_nsec = 0;
|
|
|
|
inode->i_blocks = sd_v1_blocks(sd);
|
|
inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
blocks = (inode->i_size + 511) >> 9;
|
|
blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
|
|
|
|
/*
|
|
* there was a bug in <=3.5.23 when i_blocks could take
|
|
* negative values. Starting from 3.5.17 this value could
|
|
* even be stored in stat data. For such files we set
|
|
* i_blocks based on file size. Just 2 notes: this can be
|
|
* wrong for sparse files. On-disk value will be only
|
|
* updated if file's inode will ever change
|
|
*/
|
|
if (inode->i_blocks > blocks) {
|
|
inode->i_blocks = blocks;
|
|
}
|
|
|
|
rdev = sd_v1_rdev(sd);
|
|
REISERFS_I(inode)->i_first_direct_byte =
|
|
sd_v1_first_direct_byte(sd);
|
|
|
|
/*
|
|
* an early bug in the quota code can give us an odd
|
|
* number for the block count. This is incorrect, fix it here.
|
|
*/
|
|
if (inode->i_blocks & 1) {
|
|
inode->i_blocks++;
|
|
}
|
|
inode_set_bytes(inode,
|
|
to_real_used_space(inode, inode->i_blocks,
|
|
SD_V1_SIZE));
|
|
/*
|
|
* nopack is initially zero for v1 objects. For v2 objects,
|
|
* nopack is initialised from sd_attrs
|
|
*/
|
|
REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
|
|
} else {
|
|
/*
|
|
* new stat data found, but object may have old items
|
|
* (directories and symlinks)
|
|
*/
|
|
struct stat_data *sd = (struct stat_data *)ih_item_body(bh, ih);
|
|
|
|
inode->i_mode = sd_v2_mode(sd);
|
|
set_nlink(inode, sd_v2_nlink(sd));
|
|
i_uid_write(inode, sd_v2_uid(sd));
|
|
inode->i_size = sd_v2_size(sd);
|
|
i_gid_write(inode, sd_v2_gid(sd));
|
|
inode->i_mtime.tv_sec = sd_v2_mtime(sd);
|
|
inode->i_atime.tv_sec = sd_v2_atime(sd);
|
|
inode->i_ctime.tv_sec = sd_v2_ctime(sd);
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_mtime.tv_nsec = 0;
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_blocks = sd_v2_blocks(sd);
|
|
rdev = sd_v2_rdev(sd);
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
inode->i_generation =
|
|
le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
else
|
|
inode->i_generation = sd_v2_generation(sd);
|
|
|
|
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_5);
|
|
else
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_6);
|
|
REISERFS_I(inode)->i_first_direct_byte = 0;
|
|
set_inode_sd_version(inode, STAT_DATA_V2);
|
|
inode_set_bytes(inode,
|
|
to_real_used_space(inode, inode->i_blocks,
|
|
SD_V2_SIZE));
|
|
/*
|
|
* read persistent inode attributes from sd and initialise
|
|
* generic inode flags from them
|
|
*/
|
|
REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
|
|
sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
|
|
}
|
|
|
|
pathrelse(path);
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &reiserfs_file_inode_operations;
|
|
inode->i_fop = &reiserfs_file_operations;
|
|
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &reiserfs_dir_inode_operations;
|
|
inode->i_fop = &reiserfs_dir_operations;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &reiserfs_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
|
|
} else {
|
|
inode->i_blocks = 0;
|
|
inode->i_op = &reiserfs_special_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
|
|
}
|
|
}
|
|
|
|
/* update new stat data with inode fields */
|
|
static void inode2sd(void *sd, struct inode *inode, loff_t size)
|
|
{
|
|
struct stat_data *sd_v2 = (struct stat_data *)sd;
|
|
__u16 flags;
|
|
|
|
set_sd_v2_mode(sd_v2, inode->i_mode);
|
|
set_sd_v2_nlink(sd_v2, inode->i_nlink);
|
|
set_sd_v2_uid(sd_v2, i_uid_read(inode));
|
|
set_sd_v2_size(sd_v2, size);
|
|
set_sd_v2_gid(sd_v2, i_gid_read(inode));
|
|
set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
|
|
set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
|
|
set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
|
|
set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
|
|
else
|
|
set_sd_v2_generation(sd_v2, inode->i_generation);
|
|
flags = REISERFS_I(inode)->i_attrs;
|
|
i_attrs_to_sd_attrs(inode, &flags);
|
|
set_sd_v2_attrs(sd_v2, flags);
|
|
}
|
|
|
|
/* used to copy inode's fields to old stat data */
|
|
static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
|
|
{
|
|
struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
|
|
|
|
set_sd_v1_mode(sd_v1, inode->i_mode);
|
|
set_sd_v1_uid(sd_v1, i_uid_read(inode));
|
|
set_sd_v1_gid(sd_v1, i_gid_read(inode));
|
|
set_sd_v1_nlink(sd_v1, inode->i_nlink);
|
|
set_sd_v1_size(sd_v1, size);
|
|
set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
|
|
set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
|
|
set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
|
|
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
|
|
else
|
|
set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
|
|
|
|
/* Sigh. i_first_direct_byte is back */
|
|
set_sd_v1_first_direct_byte(sd_v1,
|
|
REISERFS_I(inode)->i_first_direct_byte);
|
|
}
|
|
|
|
/*
|
|
* NOTE, you must prepare the buffer head before sending it here,
|
|
* and then log it after the call
|
|
*/
|
|
static void update_stat_data(struct treepath *path, struct inode *inode,
|
|
loff_t size)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct item_head *ih;
|
|
|
|
bh = PATH_PLAST_BUFFER(path);
|
|
ih = tp_item_head(path);
|
|
|
|
if (!is_statdata_le_ih(ih))
|
|
reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h",
|
|
INODE_PKEY(inode), ih);
|
|
|
|
/* path points to old stat data */
|
|
if (stat_data_v1(ih)) {
|
|
inode2sd_v1(ih_item_body(bh, ih), inode, size);
|
|
} else {
|
|
inode2sd(ih_item_body(bh, ih), inode, size);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode, loff_t size)
|
|
{
|
|
struct cpu_key key;
|
|
INITIALIZE_PATH(path);
|
|
struct buffer_head *bh;
|
|
int fs_gen;
|
|
struct item_head *ih, tmp_ih;
|
|
int retval;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
/* key type is unimportant */
|
|
make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);
|
|
|
|
for (;;) {
|
|
int pos;
|
|
/* look for the object's stat data */
|
|
retval = search_item(inode->i_sb, &key, &path);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_error(inode->i_sb, "vs-13050",
|
|
"i/o failure occurred trying to "
|
|
"update %K stat data", &key);
|
|
return;
|
|
}
|
|
if (retval == ITEM_NOT_FOUND) {
|
|
pos = PATH_LAST_POSITION(&path);
|
|
pathrelse(&path);
|
|
if (inode->i_nlink == 0) {
|
|
/*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
|
|
return;
|
|
}
|
|
reiserfs_warning(inode->i_sb, "vs-13060",
|
|
"stat data of object %k (nlink == %d) "
|
|
"not found (pos %d)",
|
|
INODE_PKEY(inode), inode->i_nlink,
|
|
pos);
|
|
reiserfs_check_path(&path);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* sigh, prepare_for_journal might schedule. When it
|
|
* schedules the FS might change. We have to detect that,
|
|
* and loop back to the search if the stat data item has moved
|
|
*/
|
|
bh = get_last_bh(&path);
|
|
ih = tp_item_head(&path);
|
|
copy_item_head(&tmp_ih, ih);
|
|
fs_gen = get_generation(inode->i_sb);
|
|
reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
|
|
|
|
/* Stat_data item has been moved after scheduling. */
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb, bh);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
update_stat_data(&path, inode, size);
|
|
journal_mark_dirty(th, bh);
|
|
pathrelse(&path);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* reiserfs_read_locked_inode is called to read the inode off disk, and it
|
|
* does a make_bad_inode when things go wrong. But, we need to make sure
|
|
* and clear the key in the private portion of the inode, otherwise a
|
|
* corresponding iput might try to delete whatever object the inode last
|
|
* represented.
|
|
*/
|
|
static void reiserfs_make_bad_inode(struct inode *inode)
|
|
{
|
|
memset(INODE_PKEY(inode), 0, KEY_SIZE);
|
|
make_bad_inode(inode);
|
|
}
|
|
|
|
/*
|
|
* initially this function was derived from minix or ext2's analog and
|
|
* evolved as the prototype did
|
|
*/
|
|
int reiserfs_init_locked_inode(struct inode *inode, void *p)
|
|
{
|
|
struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
|
|
inode->i_ino = args->objectid;
|
|
INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* looks for stat data in the tree, and fills up the fields of in-core
|
|
* inode stat data fields
|
|
*/
|
|
void reiserfs_read_locked_inode(struct inode *inode,
|
|
struct reiserfs_iget_args *args)
|
|
{
|
|
INITIALIZE_PATH(path_to_sd);
|
|
struct cpu_key key;
|
|
unsigned long dirino;
|
|
int retval;
|
|
|
|
dirino = args->dirid;
|
|
|
|
/*
|
|
* set version 1, version 2 could be used too, because stat data
|
|
* key is the same in both versions
|
|
*/
|
|
key.version = KEY_FORMAT_3_5;
|
|
key.on_disk_key.k_dir_id = dirino;
|
|
key.on_disk_key.k_objectid = inode->i_ino;
|
|
key.on_disk_key.k_offset = 0;
|
|
key.on_disk_key.k_type = 0;
|
|
|
|
/* look for the object's stat data */
|
|
retval = search_item(inode->i_sb, &key, &path_to_sd);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_error(inode->i_sb, "vs-13070",
|
|
"i/o failure occurred trying to find "
|
|
"stat data of %K", &key);
|
|
reiserfs_make_bad_inode(inode);
|
|
return;
|
|
}
|
|
|
|
/* a stale NFS handle can trigger this without it being an error */
|
|
if (retval != ITEM_FOUND) {
|
|
pathrelse(&path_to_sd);
|
|
reiserfs_make_bad_inode(inode);
|
|
clear_nlink(inode);
|
|
return;
|
|
}
|
|
|
|
init_inode(inode, &path_to_sd);
|
|
|
|
/*
|
|
* It is possible that knfsd is trying to access inode of a file
|
|
* that is being removed from the disk by some other thread. As we
|
|
* update sd on unlink all that is required is to check for nlink
|
|
* here. This bug was first found by Sizif when debugging
|
|
* SquidNG/Butterfly, forgotten, and found again after Philippe
|
|
* Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
|
|
|
|
* More logical fix would require changes in fs/inode.c:iput() to
|
|
* remove inode from hash-table _after_ fs cleaned disk stuff up and
|
|
* in iget() to return NULL if I_FREEING inode is found in
|
|
* hash-table.
|
|
*/
|
|
|
|
/*
|
|
* Currently there is one place where it's ok to meet inode with
|
|
* nlink==0: processing of open-unlinked and half-truncated files
|
|
* during mount (fs/reiserfs/super.c:finish_unfinished()).
|
|
*/
|
|
if ((inode->i_nlink == 0) &&
|
|
!REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
|
|
reiserfs_warning(inode->i_sb, "vs-13075",
|
|
"dead inode read from disk %K. "
|
|
"This is likely to be race with knfsd. Ignore",
|
|
&key);
|
|
reiserfs_make_bad_inode(inode);
|
|
}
|
|
|
|
/* init inode should be relsing */
|
|
reiserfs_check_path(&path_to_sd);
|
|
|
|
/*
|
|
* Stat data v1 doesn't support ACLs.
|
|
*/
|
|
if (get_inode_sd_version(inode) == STAT_DATA_V1)
|
|
cache_no_acl(inode);
|
|
}
|
|
|
|
/*
|
|
* reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
|
|
*
|
|
* @inode: inode from hash table to check
|
|
* @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
|
|
*
|
|
* This function is called by iget5_locked() to distinguish reiserfs inodes
|
|
* having the same inode numbers. Such inodes can only exist due to some
|
|
* error condition. One of them should be bad. Inodes with identical
|
|
* inode numbers (objectids) are distinguished by parent directory ids.
|
|
*
|
|
*/
|
|
int reiserfs_find_actor(struct inode *inode, void *opaque)
|
|
{
|
|
struct reiserfs_iget_args *args;
|
|
|
|
args = opaque;
|
|
/* args is already in CPU order */
|
|
return (inode->i_ino == args->objectid) &&
|
|
(le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
|
|
}
|
|
|
|
struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
|
|
{
|
|
struct inode *inode;
|
|
struct reiserfs_iget_args args;
|
|
int depth;
|
|
|
|
args.objectid = key->on_disk_key.k_objectid;
|
|
args.dirid = key->on_disk_key.k_dir_id;
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
inode = iget5_locked(s, key->on_disk_key.k_objectid,
|
|
reiserfs_find_actor, reiserfs_init_locked_inode,
|
|
(void *)(&args));
|
|
reiserfs_write_lock_nested(s, depth);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
reiserfs_read_locked_inode(inode, &args);
|
|
unlock_new_inode(inode);
|
|
}
|
|
|
|
if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
|
|
/* either due to i/o error or a stale NFS handle */
|
|
iput(inode);
|
|
inode = NULL;
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
static struct dentry *reiserfs_get_dentry(struct super_block *sb,
|
|
u32 objectid, u32 dir_id, u32 generation)
|
|
|
|
{
|
|
struct cpu_key key;
|
|
struct inode *inode;
|
|
|
|
key.on_disk_key.k_objectid = objectid;
|
|
key.on_disk_key.k_dir_id = dir_id;
|
|
reiserfs_write_lock(sb);
|
|
inode = reiserfs_iget(sb, &key);
|
|
if (inode && !IS_ERR(inode) && generation != 0 &&
|
|
generation != inode->i_generation) {
|
|
iput(inode);
|
|
inode = NULL;
|
|
}
|
|
reiserfs_write_unlock(sb);
|
|
|
|
return d_obtain_alias(inode);
|
|
}
|
|
|
|
struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
/*
|
|
* fhtype happens to reflect the number of u32s encoded.
|
|
* due to a bug in earlier code, fhtype might indicate there
|
|
* are more u32s then actually fitted.
|
|
* so if fhtype seems to be more than len, reduce fhtype.
|
|
* Valid types are:
|
|
* 2 - objectid + dir_id - legacy support
|
|
* 3 - objectid + dir_id + generation
|
|
* 4 - objectid + dir_id + objectid and dirid of parent - legacy
|
|
* 5 - objectid + dir_id + generation + objectid and dirid of parent
|
|
* 6 - as above plus generation of directory
|
|
* 6 does not fit in NFSv2 handles
|
|
*/
|
|
if (fh_type > fh_len) {
|
|
if (fh_type != 6 || fh_len != 5)
|
|
reiserfs_warning(sb, "reiserfs-13077",
|
|
"nfsd/reiserfs, fhtype=%d, len=%d - odd",
|
|
fh_type, fh_len);
|
|
fh_type = fh_len;
|
|
}
|
|
if (fh_len < 2)
|
|
return NULL;
|
|
|
|
return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
|
|
(fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
|
|
}
|
|
|
|
struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fh_type)
|
|
{
|
|
if (fh_type > fh_len)
|
|
fh_type = fh_len;
|
|
if (fh_type < 4)
|
|
return NULL;
|
|
|
|
return reiserfs_get_dentry(sb,
|
|
(fh_type >= 5) ? fid->raw[3] : fid->raw[2],
|
|
(fh_type >= 5) ? fid->raw[4] : fid->raw[3],
|
|
(fh_type == 6) ? fid->raw[5] : 0);
|
|
}
|
|
|
|
int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp,
|
|
struct inode *parent)
|
|
{
|
|
int maxlen = *lenp;
|
|
|
|
if (parent && (maxlen < 5)) {
|
|
*lenp = 5;
|
|
return FILEID_INVALID;
|
|
} else if (maxlen < 3) {
|
|
*lenp = 3;
|
|
return FILEID_INVALID;
|
|
}
|
|
|
|
data[0] = inode->i_ino;
|
|
data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
data[2] = inode->i_generation;
|
|
*lenp = 3;
|
|
if (parent) {
|
|
data[3] = parent->i_ino;
|
|
data[4] = le32_to_cpu(INODE_PKEY(parent)->k_dir_id);
|
|
*lenp = 5;
|
|
if (maxlen >= 6) {
|
|
data[5] = parent->i_generation;
|
|
*lenp = 6;
|
|
}
|
|
}
|
|
return *lenp;
|
|
}
|
|
|
|
/*
|
|
* looks for stat data, then copies fields to it, marks the buffer
|
|
* containing stat data as dirty
|
|
*/
|
|
/*
|
|
* reiserfs inodes are never really dirty, since the dirty inode call
|
|
* always logs them. This call allows the VFS inode marking routines
|
|
* to properly mark inodes for datasync and such, but only actually
|
|
* does something when called for a synchronous update.
|
|
*/
|
|
int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
int jbegin_count = 1;
|
|
|
|
if (inode->i_sb->s_flags & MS_RDONLY)
|
|
return -EROFS;
|
|
/*
|
|
* memory pressure can sometimes initiate write_inode calls with
|
|
* sync == 1,
|
|
* these cases are just when the system needs ram, not when the
|
|
* inode needs to reach disk for safety, and they can safely be
|
|
* ignored because the altered inode has already been logged.
|
|
*/
|
|
if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
|
|
reiserfs_update_sd(&th, inode);
|
|
journal_end_sync(&th);
|
|
}
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* stat data of new object is inserted already, this inserts the item
|
|
* containing "." and ".." entries
|
|
*/
|
|
static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode,
|
|
struct item_head *ih, struct treepath *path,
|
|
struct inode *dir)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
char empty_dir[EMPTY_DIR_SIZE];
|
|
char *body = empty_dir;
|
|
struct cpu_key key;
|
|
int retval;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
_make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
|
|
le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
|
|
TYPE_DIRENTRY, 3 /*key length */ );
|
|
|
|
/*
|
|
* compose item head for new item. Directories consist of items of
|
|
* old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
|
|
* is done by reiserfs_new_inode
|
|
*/
|
|
if (old_format_only(sb)) {
|
|
make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
|
|
TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
|
|
|
|
make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
|
|
ih->ih_key.k_objectid,
|
|
INODE_PKEY(dir)->k_dir_id,
|
|
INODE_PKEY(dir)->k_objectid);
|
|
} else {
|
|
make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
|
|
TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
|
|
|
|
make_empty_dir_item(body, ih->ih_key.k_dir_id,
|
|
ih->ih_key.k_objectid,
|
|
INODE_PKEY(dir)->k_dir_id,
|
|
INODE_PKEY(dir)->k_objectid);
|
|
}
|
|
|
|
/* look for place in the tree for new item */
|
|
retval = search_item(sb, &key, path);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_error(sb, "vs-13080",
|
|
"i/o failure occurred creating new directory");
|
|
return -EIO;
|
|
}
|
|
if (retval == ITEM_FOUND) {
|
|
pathrelse(path);
|
|
reiserfs_warning(sb, "vs-13070",
|
|
"object with this key exists (%k)",
|
|
&(ih->ih_key));
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* insert item, that is empty directory item */
|
|
return reiserfs_insert_item(th, path, &key, ih, inode, body);
|
|
}
|
|
|
|
/*
|
|
* stat data of object has been inserted, this inserts the item
|
|
* containing the body of symlink
|
|
*/
|
|
static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode,
|
|
struct item_head *ih,
|
|
struct treepath *path, const char *symname,
|
|
int item_len)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
struct cpu_key key;
|
|
int retval;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
_make_cpu_key(&key, KEY_FORMAT_3_5,
|
|
le32_to_cpu(ih->ih_key.k_dir_id),
|
|
le32_to_cpu(ih->ih_key.k_objectid),
|
|
1, TYPE_DIRECT, 3 /*key length */ );
|
|
|
|
make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
|
|
0 /*free_space */ );
|
|
|
|
/* look for place in the tree for new item */
|
|
retval = search_item(sb, &key, path);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_error(sb, "vs-13080",
|
|
"i/o failure occurred creating new symlink");
|
|
return -EIO;
|
|
}
|
|
if (retval == ITEM_FOUND) {
|
|
pathrelse(path);
|
|
reiserfs_warning(sb, "vs-13080",
|
|
"object with this key exists (%k)",
|
|
&(ih->ih_key));
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* insert item, that is body of symlink */
|
|
return reiserfs_insert_item(th, path, &key, ih, inode, symname);
|
|
}
|
|
|
|
/*
|
|
* inserts the stat data into the tree, and then calls
|
|
* reiserfs_new_directory (to insert ".", ".." item if new object is
|
|
* directory) or reiserfs_new_symlink (to insert symlink body if new
|
|
* object is symlink) or nothing (if new object is regular file)
|
|
|
|
* NOTE! uid and gid must already be set in the inode. If we return
|
|
* non-zero due to an error, we have to drop the quota previously allocated
|
|
* for the fresh inode. This can only be done outside a transaction, so
|
|
* if we return non-zero, we also end the transaction.
|
|
*
|
|
* @th: active transaction handle
|
|
* @dir: parent directory for new inode
|
|
* @mode: mode of new inode
|
|
* @symname: symlink contents if inode is symlink
|
|
* @isize: 0 for regular file, EMPTY_DIR_SIZE for dirs, strlen(symname) for
|
|
* symlinks
|
|
* @inode: inode to be filled
|
|
* @security: optional security context to associate with this inode
|
|
*/
|
|
int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
|
|
struct inode *dir, umode_t mode, const char *symname,
|
|
/* 0 for regular, EMTRY_DIR_SIZE for dirs,
|
|
strlen (symname) for symlinks) */
|
|
loff_t i_size, struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct reiserfs_security_handle *security)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct reiserfs_iget_args args;
|
|
INITIALIZE_PATH(path_to_key);
|
|
struct cpu_key key;
|
|
struct item_head ih;
|
|
struct stat_data sd;
|
|
int retval;
|
|
int err;
|
|
int depth;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
depth = reiserfs_write_unlock_nested(sb);
|
|
err = dquot_alloc_inode(inode);
|
|
reiserfs_write_lock_nested(sb, depth);
|
|
if (err)
|
|
goto out_end_trans;
|
|
if (!dir->i_nlink) {
|
|
err = -EPERM;
|
|
goto out_bad_inode;
|
|
}
|
|
|
|
/* item head of new item */
|
|
ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
|
|
ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
|
|
if (!ih.ih_key.k_objectid) {
|
|
err = -ENOMEM;
|
|
goto out_bad_inode;
|
|
}
|
|
args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
|
|
if (old_format_only(sb))
|
|
make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
|
|
TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
|
|
else
|
|
make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
|
|
TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
|
|
memcpy(INODE_PKEY(inode), &ih.ih_key, KEY_SIZE);
|
|
args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
|
|
|
|
depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
err = insert_inode_locked4(inode, args.objectid,
|
|
reiserfs_find_actor, &args);
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
if (err) {
|
|
err = -EINVAL;
|
|
goto out_bad_inode;
|
|
}
|
|
|
|
if (old_format_only(sb))
|
|
/*
|
|
* not a perfect generation count, as object ids can be reused,
|
|
* but this is as good as reiserfs can do right now.
|
|
* note that the private part of inode isn't filled in yet,
|
|
* we have to use the directory.
|
|
*/
|
|
inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
|
|
else
|
|
#if defined( USE_INODE_GENERATION_COUNTER )
|
|
inode->i_generation =
|
|
le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
|
|
#else
|
|
inode->i_generation = ++event;
|
|
#endif
|
|
|
|
/* fill stat data */
|
|
set_nlink(inode, (S_ISDIR(mode) ? 2 : 1));
|
|
|
|
/* uid and gid must already be set by the caller for quota init */
|
|
|
|
/* symlink cannot be immutable or append only, right? */
|
|
if (S_ISLNK(inode->i_mode))
|
|
inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
|
|
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
inode->i_size = i_size;
|
|
inode->i_blocks = 0;
|
|
inode->i_bytes = 0;
|
|
REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
|
|
U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
|
|
|
|
INIT_LIST_HEAD(&REISERFS_I(inode)->i_prealloc_list);
|
|
REISERFS_I(inode)->i_flags = 0;
|
|
REISERFS_I(inode)->i_prealloc_block = 0;
|
|
REISERFS_I(inode)->i_prealloc_count = 0;
|
|
REISERFS_I(inode)->i_trans_id = 0;
|
|
REISERFS_I(inode)->i_jl = NULL;
|
|
REISERFS_I(inode)->i_attrs =
|
|
REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
|
|
sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
|
|
reiserfs_init_xattr_rwsem(inode);
|
|
|
|
/* key to search for correct place for new stat data */
|
|
_make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
|
|
le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
|
|
TYPE_STAT_DATA, 3 /*key length */ );
|
|
|
|
/* find proper place for inserting of stat data */
|
|
retval = search_item(sb, &key, &path_to_key);
|
|
if (retval == IO_ERROR) {
|
|
err = -EIO;
|
|
goto out_bad_inode;
|
|
}
|
|
if (retval == ITEM_FOUND) {
|
|
pathrelse(&path_to_key);
|
|
err = -EEXIST;
|
|
goto out_bad_inode;
|
|
}
|
|
if (old_format_only(sb)) {
|
|
/* i_uid or i_gid is too big to be stored in stat data v3.5 */
|
|
if (i_uid_read(inode) & ~0xffff || i_gid_read(inode) & ~0xffff) {
|
|
pathrelse(&path_to_key);
|
|
err = -EINVAL;
|
|
goto out_bad_inode;
|
|
}
|
|
inode2sd_v1(&sd, inode, inode->i_size);
|
|
} else {
|
|
inode2sd(&sd, inode, inode->i_size);
|
|
}
|
|
/*
|
|
* store in in-core inode the key of stat data and version all
|
|
* object items will have (directory items will have old offset
|
|
* format, other new objects will consist of new items)
|
|
*/
|
|
if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_5);
|
|
else
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_6);
|
|
if (old_format_only(sb))
|
|
set_inode_sd_version(inode, STAT_DATA_V1);
|
|
else
|
|
set_inode_sd_version(inode, STAT_DATA_V2);
|
|
|
|
/* insert the stat data into the tree */
|
|
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
|
|
if (REISERFS_I(dir)->new_packing_locality)
|
|
th->displace_new_blocks = 1;
|
|
#endif
|
|
retval =
|
|
reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
|
|
(char *)(&sd));
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
goto out_bad_inode;
|
|
}
|
|
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
|
|
if (!th->displace_new_blocks)
|
|
REISERFS_I(dir)->new_packing_locality = 0;
|
|
#endif
|
|
if (S_ISDIR(mode)) {
|
|
/* insert item with "." and ".." */
|
|
retval =
|
|
reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
|
|
}
|
|
|
|
if (S_ISLNK(mode)) {
|
|
/* insert body of symlink */
|
|
if (!old_format_only(sb))
|
|
i_size = ROUND_UP(i_size);
|
|
retval =
|
|
reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
|
|
i_size);
|
|
}
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
journal_end(th);
|
|
goto out_inserted_sd;
|
|
}
|
|
|
|
if (reiserfs_posixacl(inode->i_sb)) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
journal_end(th);
|
|
goto out_inserted_sd;
|
|
}
|
|
} else if (inode->i_sb->s_flags & MS_POSIXACL) {
|
|
reiserfs_warning(inode->i_sb, "jdm-13090",
|
|
"ACLs aren't enabled in the fs, "
|
|
"but vfs thinks they are!");
|
|
} else if (IS_PRIVATE(dir))
|
|
inode->i_flags |= S_PRIVATE;
|
|
|
|
if (security->name) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
retval = reiserfs_security_write(th, inode, security);
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
retval = journal_end(th);
|
|
if (retval)
|
|
err = retval;
|
|
goto out_inserted_sd;
|
|
}
|
|
}
|
|
|
|
reiserfs_update_sd(th, inode);
|
|
reiserfs_check_path(&path_to_key);
|
|
|
|
return 0;
|
|
|
|
out_bad_inode:
|
|
/* Invalidate the object, nothing was inserted yet */
|
|
INODE_PKEY(inode)->k_objectid = 0;
|
|
|
|
/* Quota change must be inside a transaction for journaling */
|
|
depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
dquot_free_inode(inode);
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
|
|
out_end_trans:
|
|
journal_end(th);
|
|
/*
|
|
* Drop can be outside and it needs more credits so it's better
|
|
* to have it outside
|
|
*/
|
|
depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
dquot_drop(inode);
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
inode->i_flags |= S_NOQUOTA;
|
|
make_bad_inode(inode);
|
|
|
|
out_inserted_sd:
|
|
clear_nlink(inode);
|
|
th->t_trans_id = 0; /* so the caller can't use this handle later */
|
|
unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* finds the tail page in the page cache,
|
|
* reads the last block in.
|
|
*
|
|
* On success, page_result is set to a locked, pinned page, and bh_result
|
|
* is set to an up to date buffer for the last block in the file. returns 0.
|
|
*
|
|
* tail conversion is not done, so bh_result might not be valid for writing
|
|
* check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
|
|
* trying to write the block.
|
|
*
|
|
* on failure, nonzero is returned, page_result and bh_result are untouched.
|
|
*/
|
|
static int grab_tail_page(struct inode *inode,
|
|
struct page **page_result,
|
|
struct buffer_head **bh_result)
|
|
{
|
|
|
|
/*
|
|
* we want the page with the last byte in the file,
|
|
* not the page that will hold the next byte for appending
|
|
*/
|
|
unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
|
|
unsigned long pos = 0;
|
|
unsigned long start = 0;
|
|
unsigned long blocksize = inode->i_sb->s_blocksize;
|
|
unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
|
|
struct buffer_head *bh;
|
|
struct buffer_head *head;
|
|
struct page *page;
|
|
int error;
|
|
|
|
/*
|
|
* we know that we are only called with inode->i_size > 0.
|
|
* we also know that a file tail can never be as big as a block
|
|
* If i_size % blocksize == 0, our file is currently block aligned
|
|
* and it won't need converting or zeroing after a truncate.
|
|
*/
|
|
if ((offset & (blocksize - 1)) == 0) {
|
|
return -ENOENT;
|
|
}
|
|
page = grab_cache_page(inode->i_mapping, index);
|
|
error = -ENOMEM;
|
|
if (!page) {
|
|
goto out;
|
|
}
|
|
/* start within the page of the last block in the file */
|
|
start = (offset / blocksize) * blocksize;
|
|
|
|
error = __block_write_begin(page, start, offset - start,
|
|
reiserfs_get_block_create_0);
|
|
if (error)
|
|
goto unlock;
|
|
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
if (pos >= start) {
|
|
break;
|
|
}
|
|
bh = bh->b_this_page;
|
|
pos += blocksize;
|
|
} while (bh != head);
|
|
|
|
if (!buffer_uptodate(bh)) {
|
|
/*
|
|
* note, this should never happen, prepare_write should be
|
|
* taking care of this for us. If the buffer isn't up to
|
|
* date, I've screwed up the code to find the buffer, or the
|
|
* code to call prepare_write
|
|
*/
|
|
reiserfs_error(inode->i_sb, "clm-6000",
|
|
"error reading block %lu", bh->b_blocknr);
|
|
error = -EIO;
|
|
goto unlock;
|
|
}
|
|
*bh_result = bh;
|
|
*page_result = page;
|
|
|
|
out:
|
|
return error;
|
|
|
|
unlock:
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* vfs version of truncate file. Must NOT be called with
|
|
* a transaction already started.
|
|
*
|
|
* some code taken from block_truncate_page
|
|
*/
|
|
int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
/* we want the offset for the first byte after the end of the file */
|
|
unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
|
|
unsigned blocksize = inode->i_sb->s_blocksize;
|
|
unsigned length;
|
|
struct page *page = NULL;
|
|
int error;
|
|
struct buffer_head *bh = NULL;
|
|
int err2;
|
|
|
|
reiserfs_write_lock(inode->i_sb);
|
|
|
|
if (inode->i_size > 0) {
|
|
error = grab_tail_page(inode, &page, &bh);
|
|
if (error) {
|
|
/*
|
|
* -ENOENT means we truncated past the end of the
|
|
* file, and get_block_create_0 could not find a
|
|
* block to read in, which is ok.
|
|
*/
|
|
if (error != -ENOENT)
|
|
reiserfs_error(inode->i_sb, "clm-6001",
|
|
"grab_tail_page failed %d",
|
|
error);
|
|
page = NULL;
|
|
bh = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* so, if page != NULL, we have a buffer head for the offset at
|
|
* the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
|
|
* then we have an unformatted node. Otherwise, we have a direct item,
|
|
* and no zeroing is required on disk. We zero after the truncate,
|
|
* because the truncate might pack the item anyway
|
|
* (it will unmap bh if it packs).
|
|
*
|
|
* it is enough to reserve space in transaction for 2 balancings:
|
|
* one for "save" link adding and another for the first
|
|
* cut_from_item. 1 is for update_sd
|
|
*/
|
|
error = journal_begin(&th, inode->i_sb,
|
|
JOURNAL_PER_BALANCE_CNT * 2 + 1);
|
|
if (error)
|
|
goto out;
|
|
reiserfs_update_inode_transaction(inode);
|
|
if (update_timestamps)
|
|
/*
|
|
* we are doing real truncate: if the system crashes
|
|
* before the last transaction of truncating gets committed
|
|
* - on reboot the file either appears truncated properly
|
|
* or not truncated at all
|
|
*/
|
|
add_save_link(&th, inode, 1);
|
|
err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
|
|
error = journal_end(&th);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* check reiserfs_do_truncate after ending the transaction */
|
|
if (err2) {
|
|
error = err2;
|
|
goto out;
|
|
}
|
|
|
|
if (update_timestamps) {
|
|
error = remove_save_link(inode, 1 /* truncate */);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
if (page) {
|
|
length = offset & (blocksize - 1);
|
|
/* if we are not on a block boundary */
|
|
if (length) {
|
|
length = blocksize - length;
|
|
zero_user(page, offset, length);
|
|
if (buffer_mapped(bh) && bh->b_blocknr != 0) {
|
|
mark_buffer_dirty(bh);
|
|
}
|
|
}
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
}
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
return 0;
|
|
out:
|
|
if (page) {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
}
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int map_block_for_writepage(struct inode *inode,
|
|
struct buffer_head *bh_result,
|
|
unsigned long block)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
int fs_gen;
|
|
struct item_head tmp_ih;
|
|
struct item_head *ih;
|
|
struct buffer_head *bh;
|
|
__le32 *item;
|
|
struct cpu_key key;
|
|
INITIALIZE_PATH(path);
|
|
int pos_in_item;
|
|
int jbegin_count = JOURNAL_PER_BALANCE_CNT;
|
|
loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
|
|
int retval;
|
|
int use_get_block = 0;
|
|
int bytes_copied = 0;
|
|
int copy_size;
|
|
int trans_running = 0;
|
|
|
|
/*
|
|
* catch places below that try to log something without
|
|
* starting a trans
|
|
*/
|
|
th.t_trans_id = 0;
|
|
|
|
if (!buffer_uptodate(bh_result)) {
|
|
return -EIO;
|
|
}
|
|
|
|
kmap(bh_result->b_page);
|
|
start_over:
|
|
reiserfs_write_lock(inode->i_sb);
|
|
make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
|
|
|
|
research:
|
|
retval = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (retval != POSITION_FOUND) {
|
|
use_get_block = 1;
|
|
goto out;
|
|
}
|
|
|
|
bh = get_last_bh(&path);
|
|
ih = tp_item_head(&path);
|
|
item = tp_item_body(&path);
|
|
pos_in_item = path.pos_in_item;
|
|
|
|
/* we've found an unformatted node */
|
|
if (indirect_item_found(retval, ih)) {
|
|
if (bytes_copied > 0) {
|
|
reiserfs_warning(inode->i_sb, "clm-6002",
|
|
"bytes_copied %d", bytes_copied);
|
|
}
|
|
if (!get_block_num(item, pos_in_item)) {
|
|
/* crap, we are writing to a hole */
|
|
use_get_block = 1;
|
|
goto out;
|
|
}
|
|
set_block_dev_mapped(bh_result,
|
|
get_block_num(item, pos_in_item), inode);
|
|
} else if (is_direct_le_ih(ih)) {
|
|
char *p;
|
|
p = page_address(bh_result->b_page);
|
|
p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
|
|
copy_size = ih_item_len(ih) - pos_in_item;
|
|
|
|
fs_gen = get_generation(inode->i_sb);
|
|
copy_item_head(&tmp_ih, ih);
|
|
|
|
if (!trans_running) {
|
|
/* vs-3050 is gone, no need to drop the path */
|
|
retval = journal_begin(&th, inode->i_sb, jbegin_count);
|
|
if (retval)
|
|
goto out;
|
|
reiserfs_update_inode_transaction(inode);
|
|
trans_running = 1;
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb,
|
|
bh);
|
|
goto research;
|
|
}
|
|
}
|
|
|
|
reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
|
|
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb, bh);
|
|
goto research;
|
|
}
|
|
|
|
memcpy(ih_item_body(bh, ih) + pos_in_item, p + bytes_copied,
|
|
copy_size);
|
|
|
|
journal_mark_dirty(&th, bh);
|
|
bytes_copied += copy_size;
|
|
set_block_dev_mapped(bh_result, 0, inode);
|
|
|
|
/* are there still bytes left? */
|
|
if (bytes_copied < bh_result->b_size &&
|
|
(byte_offset + bytes_copied) < inode->i_size) {
|
|
set_cpu_key_k_offset(&key,
|
|
cpu_key_k_offset(&key) +
|
|
copy_size);
|
|
goto research;
|
|
}
|
|
} else {
|
|
reiserfs_warning(inode->i_sb, "clm-6003",
|
|
"bad item inode %lu", inode->i_ino);
|
|
retval = -EIO;
|
|
goto out;
|
|
}
|
|
retval = 0;
|
|
|
|
out:
|
|
pathrelse(&path);
|
|
if (trans_running) {
|
|
int err = journal_end(&th);
|
|
if (err)
|
|
retval = err;
|
|
trans_running = 0;
|
|
}
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
/* this is where we fill in holes in the file. */
|
|
if (use_get_block) {
|
|
retval = reiserfs_get_block(inode, block, bh_result,
|
|
GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
|
|
| GET_BLOCK_NO_DANGLE);
|
|
if (!retval) {
|
|
if (!buffer_mapped(bh_result)
|
|
|| bh_result->b_blocknr == 0) {
|
|
/* get_block failed to find a mapped unformatted node. */
|
|
use_get_block = 0;
|
|
goto start_over;
|
|
}
|
|
}
|
|
}
|
|
kunmap(bh_result->b_page);
|
|
|
|
if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
|
|
/*
|
|
* we've copied data from the page into the direct item, so the
|
|
* buffer in the page is now clean, mark it to reflect that.
|
|
*/
|
|
lock_buffer(bh_result);
|
|
clear_buffer_dirty(bh_result);
|
|
unlock_buffer(bh_result);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* mason@suse.com: updated in 2.5.54 to follow the same general io
|
|
* start/recovery path as __block_write_full_page, along with special
|
|
* code to handle reiserfs tails.
|
|
*/
|
|
static int reiserfs_write_full_page(struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
|
|
int error = 0;
|
|
unsigned long block;
|
|
sector_t last_block;
|
|
struct buffer_head *head, *bh;
|
|
int partial = 0;
|
|
int nr = 0;
|
|
int checked = PageChecked(page);
|
|
struct reiserfs_transaction_handle th;
|
|
struct super_block *s = inode->i_sb;
|
|
int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
|
|
th.t_trans_id = 0;
|
|
|
|
/* no logging allowed when nonblocking or from PF_MEMALLOC */
|
|
if (checked && (current->flags & PF_MEMALLOC)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The page dirty bit is cleared before writepage is called, which
|
|
* means we have to tell create_empty_buffers to make dirty buffers
|
|
* The page really should be up to date at this point, so tossing
|
|
* in the BH_Uptodate is just a sanity check.
|
|
*/
|
|
if (!page_has_buffers(page)) {
|
|
create_empty_buffers(page, s->s_blocksize,
|
|
(1 << BH_Dirty) | (1 << BH_Uptodate));
|
|
}
|
|
head = page_buffers(page);
|
|
|
|
/*
|
|
* last page in the file, zero out any contents past the
|
|
* last byte in the file
|
|
*/
|
|
if (page->index >= end_index) {
|
|
unsigned last_offset;
|
|
|
|
last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
|
|
/* no file contents in this page */
|
|
if (page->index >= end_index + 1 || !last_offset) {
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
|
|
}
|
|
bh = head;
|
|
block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
|
|
last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
|
|
/* first map all the buffers, logging any direct items we find */
|
|
do {
|
|
if (block > last_block) {
|
|
/*
|
|
* This can happen when the block size is less than
|
|
* the page size. The corresponding bytes in the page
|
|
* were zero filled above
|
|
*/
|
|
clear_buffer_dirty(bh);
|
|
set_buffer_uptodate(bh);
|
|
} else if ((checked || buffer_dirty(bh)) &&
|
|
(!buffer_mapped(bh) || (buffer_mapped(bh)
|
|
&& bh->b_blocknr ==
|
|
0))) {
|
|
/*
|
|
* not mapped yet, or it points to a direct item, search
|
|
* the btree for the mapping info, and log any direct
|
|
* items found
|
|
*/
|
|
if ((error = map_block_for_writepage(inode, bh, block))) {
|
|
goto fail;
|
|
}
|
|
}
|
|
bh = bh->b_this_page;
|
|
block++;
|
|
} while (bh != head);
|
|
|
|
/*
|
|
* we start the transaction after map_block_for_writepage,
|
|
* because it can create holes in the file (an unbounded operation).
|
|
* starting it here, we can make a reliable estimate for how many
|
|
* blocks we're going to log
|
|
*/
|
|
if (checked) {
|
|
ClearPageChecked(page);
|
|
reiserfs_write_lock(s);
|
|
error = journal_begin(&th, s, bh_per_page + 1);
|
|
if (error) {
|
|
reiserfs_write_unlock(s);
|
|
goto fail;
|
|
}
|
|
reiserfs_update_inode_transaction(inode);
|
|
}
|
|
/* now go through and lock any dirty buffers on the page */
|
|
do {
|
|
get_bh(bh);
|
|
if (!buffer_mapped(bh))
|
|
continue;
|
|
if (buffer_mapped(bh) && bh->b_blocknr == 0)
|
|
continue;
|
|
|
|
if (checked) {
|
|
reiserfs_prepare_for_journal(s, bh, 1);
|
|
journal_mark_dirty(&th, bh);
|
|
continue;
|
|
}
|
|
/*
|
|
* from this point on, we know the buffer is mapped to a
|
|
* real block and not a direct item
|
|
*/
|
|
if (wbc->sync_mode != WB_SYNC_NONE) {
|
|
lock_buffer(bh);
|
|
} else {
|
|
if (!trylock_buffer(bh)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
continue;
|
|
}
|
|
}
|
|
if (test_clear_buffer_dirty(bh)) {
|
|
mark_buffer_async_write(bh);
|
|
} else {
|
|
unlock_buffer(bh);
|
|
}
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
if (checked) {
|
|
error = journal_end(&th);
|
|
reiserfs_write_unlock(s);
|
|
if (error)
|
|
goto fail;
|
|
}
|
|
BUG_ON(PageWriteback(page));
|
|
set_page_writeback(page);
|
|
unlock_page(page);
|
|
|
|
/*
|
|
* since any buffer might be the only dirty buffer on the page,
|
|
* the first submit_bh can bring the page out of writeback.
|
|
* be careful with the buffers.
|
|
*/
|
|
do {
|
|
struct buffer_head *next = bh->b_this_page;
|
|
if (buffer_async_write(bh)) {
|
|
submit_bh(WRITE, bh);
|
|
nr++;
|
|
}
|
|
put_bh(bh);
|
|
bh = next;
|
|
} while (bh != head);
|
|
|
|
error = 0;
|
|
done:
|
|
if (nr == 0) {
|
|
/*
|
|
* if this page only had a direct item, it is very possible for
|
|
* no io to be required without there being an error. Or,
|
|
* someone else could have locked them and sent them down the
|
|
* pipe without locking the page
|
|
*/
|
|
bh = head;
|
|
do {
|
|
if (!buffer_uptodate(bh)) {
|
|
partial = 1;
|
|
break;
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
if (!partial)
|
|
SetPageUptodate(page);
|
|
end_page_writeback(page);
|
|
}
|
|
return error;
|
|
|
|
fail:
|
|
/*
|
|
* catches various errors, we need to make sure any valid dirty blocks
|
|
* get to the media. The page is currently locked and not marked for
|
|
* writeback
|
|
*/
|
|
ClearPageUptodate(page);
|
|
bh = head;
|
|
do {
|
|
get_bh(bh);
|
|
if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
|
|
lock_buffer(bh);
|
|
mark_buffer_async_write(bh);
|
|
} else {
|
|
/*
|
|
* clear any dirty bits that might have come from
|
|
* getting attached to a dirty page
|
|
*/
|
|
clear_buffer_dirty(bh);
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
SetPageError(page);
|
|
BUG_ON(PageWriteback(page));
|
|
set_page_writeback(page);
|
|
unlock_page(page);
|
|
do {
|
|
struct buffer_head *next = bh->b_this_page;
|
|
if (buffer_async_write(bh)) {
|
|
clear_buffer_dirty(bh);
|
|
submit_bh(WRITE, bh);
|
|
nr++;
|
|
}
|
|
put_bh(bh);
|
|
bh = next;
|
|
} while (bh != head);
|
|
goto done;
|
|
}
|
|
|
|
static int reiserfs_readpage(struct file *f, struct page *page)
|
|
{
|
|
return block_read_full_page(page, reiserfs_get_block);
|
|
}
|
|
|
|
static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
return reiserfs_write_full_page(page, wbc);
|
|
}
|
|
|
|
static void reiserfs_truncate_failed_write(struct inode *inode)
|
|
{
|
|
truncate_inode_pages(inode->i_mapping, inode->i_size);
|
|
reiserfs_truncate_file(inode, 0);
|
|
}
|
|
|
|
static int reiserfs_write_begin(struct file *file,
|
|
struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct inode *inode;
|
|
struct page *page;
|
|
pgoff_t index;
|
|
int ret;
|
|
int old_ref = 0;
|
|
|
|
inode = mapping->host;
|
|
*fsdata = 0;
|
|
if (flags & AOP_FLAG_CONT_EXPAND &&
|
|
(pos & (inode->i_sb->s_blocksize - 1)) == 0) {
|
|
pos ++;
|
|
*fsdata = (void *)(unsigned long)flags;
|
|
}
|
|
|
|
index = pos >> PAGE_CACHE_SHIFT;
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
*pagep = page;
|
|
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
fix_tail_page_for_writing(page);
|
|
if (reiserfs_transaction_running(inode->i_sb)) {
|
|
struct reiserfs_transaction_handle *th;
|
|
th = (struct reiserfs_transaction_handle *)current->
|
|
journal_info;
|
|
BUG_ON(!th->t_refcount);
|
|
BUG_ON(!th->t_trans_id);
|
|
old_ref = th->t_refcount;
|
|
th->t_refcount++;
|
|
}
|
|
ret = __block_write_begin(page, pos, len, reiserfs_get_block);
|
|
if (ret && reiserfs_transaction_running(inode->i_sb)) {
|
|
struct reiserfs_transaction_handle *th = current->journal_info;
|
|
/*
|
|
* this gets a little ugly. If reiserfs_get_block returned an
|
|
* error and left a transacstion running, we've got to close
|
|
* it, and we've got to free handle if it was a persistent
|
|
* transaction.
|
|
*
|
|
* But, if we had nested into an existing transaction, we need
|
|
* to just drop the ref count on the handle.
|
|
*
|
|
* If old_ref == 0, the transaction is from reiserfs_get_block,
|
|
* and it was a persistent trans. Otherwise, it was nested
|
|
* above.
|
|
*/
|
|
if (th->t_refcount > old_ref) {
|
|
if (old_ref)
|
|
th->t_refcount--;
|
|
else {
|
|
int err;
|
|
reiserfs_write_lock(inode->i_sb);
|
|
err = reiserfs_end_persistent_transaction(th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (err)
|
|
ret = err;
|
|
}
|
|
}
|
|
}
|
|
if (ret) {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
/* Truncate allocated blocks */
|
|
reiserfs_truncate_failed_write(inode);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
int ret;
|
|
int old_ref = 0;
|
|
int depth;
|
|
|
|
depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
|
|
fix_tail_page_for_writing(page);
|
|
if (reiserfs_transaction_running(inode->i_sb)) {
|
|
struct reiserfs_transaction_handle *th;
|
|
th = (struct reiserfs_transaction_handle *)current->
|
|
journal_info;
|
|
BUG_ON(!th->t_refcount);
|
|
BUG_ON(!th->t_trans_id);
|
|
old_ref = th->t_refcount;
|
|
th->t_refcount++;
|
|
}
|
|
|
|
ret = __block_write_begin(page, from, len, reiserfs_get_block);
|
|
if (ret && reiserfs_transaction_running(inode->i_sb)) {
|
|
struct reiserfs_transaction_handle *th = current->journal_info;
|
|
/*
|
|
* this gets a little ugly. If reiserfs_get_block returned an
|
|
* error and left a transacstion running, we've got to close
|
|
* it, and we've got to free handle if it was a persistent
|
|
* transaction.
|
|
*
|
|
* But, if we had nested into an existing transaction, we need
|
|
* to just drop the ref count on the handle.
|
|
*
|
|
* If old_ref == 0, the transaction is from reiserfs_get_block,
|
|
* and it was a persistent trans. Otherwise, it was nested
|
|
* above.
|
|
*/
|
|
if (th->t_refcount > old_ref) {
|
|
if (old_ref)
|
|
th->t_refcount--;
|
|
else {
|
|
int err;
|
|
reiserfs_write_lock(inode->i_sb);
|
|
err = reiserfs_end_persistent_transaction(th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (err)
|
|
ret = err;
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
|
|
{
|
|
return generic_block_bmap(as, block, reiserfs_bmap);
|
|
}
|
|
|
|
static int reiserfs_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
int ret = 0;
|
|
int update_sd = 0;
|
|
struct reiserfs_transaction_handle *th;
|
|
unsigned start;
|
|
bool locked = false;
|
|
|
|
if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
|
|
pos ++;
|
|
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
if (reiserfs_transaction_running(inode->i_sb))
|
|
th = current->journal_info;
|
|
else
|
|
th = NULL;
|
|
|
|
start = pos & (PAGE_CACHE_SIZE - 1);
|
|
if (unlikely(copied < len)) {
|
|
if (!PageUptodate(page))
|
|
copied = 0;
|
|
|
|
page_zero_new_buffers(page, start + copied, start + len);
|
|
}
|
|
flush_dcache_page(page);
|
|
|
|
reiserfs_commit_page(inode, page, start, start + copied);
|
|
|
|
/*
|
|
* generic_commit_write does this for us, but does not update the
|
|
* transaction tracking stuff when the size changes. So, we have
|
|
* to do the i_size updates here.
|
|
*/
|
|
if (pos + copied > inode->i_size) {
|
|
struct reiserfs_transaction_handle myth;
|
|
reiserfs_write_lock(inode->i_sb);
|
|
locked = true;
|
|
/*
|
|
* If the file have grown beyond the border where it
|
|
* can have a tail, unmark it as needing a tail
|
|
* packing
|
|
*/
|
|
if ((have_large_tails(inode->i_sb)
|
|
&& inode->i_size > i_block_size(inode) * 4)
|
|
|| (have_small_tails(inode->i_sb)
|
|
&& inode->i_size > i_block_size(inode)))
|
|
REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
|
|
|
|
ret = journal_begin(&myth, inode->i_sb, 1);
|
|
if (ret)
|
|
goto journal_error;
|
|
|
|
reiserfs_update_inode_transaction(inode);
|
|
inode->i_size = pos + copied;
|
|
/*
|
|
* this will just nest into our transaction. It's important
|
|
* to use mark_inode_dirty so the inode gets pushed around on
|
|
* the dirty lists, and so that O_SYNC works as expected
|
|
*/
|
|
mark_inode_dirty(inode);
|
|
reiserfs_update_sd(&myth, inode);
|
|
update_sd = 1;
|
|
ret = journal_end(&myth);
|
|
if (ret)
|
|
goto journal_error;
|
|
}
|
|
if (th) {
|
|
if (!locked) {
|
|
reiserfs_write_lock(inode->i_sb);
|
|
locked = true;
|
|
}
|
|
if (!update_sd)
|
|
mark_inode_dirty(inode);
|
|
ret = reiserfs_end_persistent_transaction(th);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (locked)
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
if (pos + len > inode->i_size)
|
|
reiserfs_truncate_failed_write(inode);
|
|
|
|
return ret == 0 ? copied : ret;
|
|
|
|
journal_error:
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
locked = false;
|
|
if (th) {
|
|
if (!update_sd)
|
|
reiserfs_update_sd(th, inode);
|
|
ret = reiserfs_end_persistent_transaction(th);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
int reiserfs_commit_write(struct file *f, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
|
|
int ret = 0;
|
|
int update_sd = 0;
|
|
struct reiserfs_transaction_handle *th = NULL;
|
|
int depth;
|
|
|
|
depth = reiserfs_write_unlock_nested(inode->i_sb);
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
reiserfs_write_lock_nested(inode->i_sb, depth);
|
|
|
|
if (reiserfs_transaction_running(inode->i_sb)) {
|
|
th = current->journal_info;
|
|
}
|
|
reiserfs_commit_page(inode, page, from, to);
|
|
|
|
/*
|
|
* generic_commit_write does this for us, but does not update the
|
|
* transaction tracking stuff when the size changes. So, we have
|
|
* to do the i_size updates here.
|
|
*/
|
|
if (pos > inode->i_size) {
|
|
struct reiserfs_transaction_handle myth;
|
|
/*
|
|
* If the file have grown beyond the border where it
|
|
* can have a tail, unmark it as needing a tail
|
|
* packing
|
|
*/
|
|
if ((have_large_tails(inode->i_sb)
|
|
&& inode->i_size > i_block_size(inode) * 4)
|
|
|| (have_small_tails(inode->i_sb)
|
|
&& inode->i_size > i_block_size(inode)))
|
|
REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
|
|
|
|
ret = journal_begin(&myth, inode->i_sb, 1);
|
|
if (ret)
|
|
goto journal_error;
|
|
|
|
reiserfs_update_inode_transaction(inode);
|
|
inode->i_size = pos;
|
|
/*
|
|
* this will just nest into our transaction. It's important
|
|
* to use mark_inode_dirty so the inode gets pushed around
|
|
* on the dirty lists, and so that O_SYNC works as expected
|
|
*/
|
|
mark_inode_dirty(inode);
|
|
reiserfs_update_sd(&myth, inode);
|
|
update_sd = 1;
|
|
ret = journal_end(&myth);
|
|
if (ret)
|
|
goto journal_error;
|
|
}
|
|
if (th) {
|
|
if (!update_sd)
|
|
mark_inode_dirty(inode);
|
|
ret = reiserfs_end_persistent_transaction(th);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
|
|
journal_error:
|
|
if (th) {
|
|
if (!update_sd)
|
|
reiserfs_update_sd(th, inode);
|
|
ret = reiserfs_end_persistent_transaction(th);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
|
|
{
|
|
if (reiserfs_attrs(inode->i_sb)) {
|
|
if (sd_attrs & REISERFS_SYNC_FL)
|
|
inode->i_flags |= S_SYNC;
|
|
else
|
|
inode->i_flags &= ~S_SYNC;
|
|
if (sd_attrs & REISERFS_IMMUTABLE_FL)
|
|
inode->i_flags |= S_IMMUTABLE;
|
|
else
|
|
inode->i_flags &= ~S_IMMUTABLE;
|
|
if (sd_attrs & REISERFS_APPEND_FL)
|
|
inode->i_flags |= S_APPEND;
|
|
else
|
|
inode->i_flags &= ~S_APPEND;
|
|
if (sd_attrs & REISERFS_NOATIME_FL)
|
|
inode->i_flags |= S_NOATIME;
|
|
else
|
|
inode->i_flags &= ~S_NOATIME;
|
|
if (sd_attrs & REISERFS_NOTAIL_FL)
|
|
REISERFS_I(inode)->i_flags |= i_nopack_mask;
|
|
else
|
|
REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
|
|
}
|
|
}
|
|
|
|
void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
|
|
{
|
|
if (reiserfs_attrs(inode->i_sb)) {
|
|
if (inode->i_flags & S_IMMUTABLE)
|
|
*sd_attrs |= REISERFS_IMMUTABLE_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_IMMUTABLE_FL;
|
|
if (inode->i_flags & S_SYNC)
|
|
*sd_attrs |= REISERFS_SYNC_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_SYNC_FL;
|
|
if (inode->i_flags & S_NOATIME)
|
|
*sd_attrs |= REISERFS_NOATIME_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_NOATIME_FL;
|
|
if (REISERFS_I(inode)->i_flags & i_nopack_mask)
|
|
*sd_attrs |= REISERFS_NOTAIL_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_NOTAIL_FL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* decide if this buffer needs to stay around for data logging or ordered
|
|
* write purposes
|
|
*/
|
|
static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
int ret = 1;
|
|
struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
|
|
|
|
lock_buffer(bh);
|
|
spin_lock(&j->j_dirty_buffers_lock);
|
|
if (!buffer_mapped(bh)) {
|
|
goto free_jh;
|
|
}
|
|
/*
|
|
* the page is locked, and the only places that log a data buffer
|
|
* also lock the page.
|
|
*/
|
|
if (reiserfs_file_data_log(inode)) {
|
|
/*
|
|
* very conservative, leave the buffer pinned if
|
|
* anyone might need it.
|
|
*/
|
|
if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
|
|
ret = 0;
|
|
}
|
|
} else if (buffer_dirty(bh)) {
|
|
struct reiserfs_journal_list *jl;
|
|
struct reiserfs_jh *jh = bh->b_private;
|
|
|
|
/*
|
|
* why is this safe?
|
|
* reiserfs_setattr updates i_size in the on disk
|
|
* stat data before allowing vmtruncate to be called.
|
|
*
|
|
* If buffer was put onto the ordered list for this
|
|
* transaction, we know for sure either this transaction
|
|
* or an older one already has updated i_size on disk,
|
|
* and this ordered data won't be referenced in the file
|
|
* if we crash.
|
|
*
|
|
* if the buffer was put onto the ordered list for an older
|
|
* transaction, we need to leave it around
|
|
*/
|
|
if (jh && (jl = jh->jl)
|
|
&& jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
|
|
ret = 0;
|
|
}
|
|
free_jh:
|
|
if (ret && bh->b_private) {
|
|
reiserfs_free_jh(bh);
|
|
}
|
|
spin_unlock(&j->j_dirty_buffers_lock);
|
|
unlock_buffer(bh);
|
|
return ret;
|
|
}
|
|
|
|
/* clm -- taken from fs/buffer.c:block_invalidate_page */
|
|
static void reiserfs_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct buffer_head *head, *bh, *next;
|
|
struct inode *inode = page->mapping->host;
|
|
unsigned int curr_off = 0;
|
|
unsigned int stop = offset + length;
|
|
int partial_page = (offset || length < PAGE_CACHE_SIZE);
|
|
int ret = 1;
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
if (!partial_page)
|
|
ClearPageChecked(page);
|
|
|
|
if (!page_has_buffers(page))
|
|
goto out;
|
|
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
unsigned int next_off = curr_off + bh->b_size;
|
|
next = bh->b_this_page;
|
|
|
|
if (next_off > stop)
|
|
goto out;
|
|
|
|
/*
|
|
* is this block fully invalidated?
|
|
*/
|
|
if (offset <= curr_off) {
|
|
if (invalidatepage_can_drop(inode, bh))
|
|
reiserfs_unmap_buffer(bh);
|
|
else
|
|
ret = 0;
|
|
}
|
|
curr_off = next_off;
|
|
bh = next;
|
|
} while (bh != head);
|
|
|
|
/*
|
|
* We release buffers only if the entire page is being invalidated.
|
|
* The get_block cached value has been unconditionally invalidated,
|
|
* so real IO is not possible anymore.
|
|
*/
|
|
if (!partial_page && ret) {
|
|
ret = try_to_release_page(page, 0);
|
|
/* maybe should BUG_ON(!ret); - neilb */
|
|
}
|
|
out:
|
|
return;
|
|
}
|
|
|
|
static int reiserfs_set_page_dirty(struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
if (reiserfs_file_data_log(inode)) {
|
|
SetPageChecked(page);
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
return __set_page_dirty_buffers(page);
|
|
}
|
|
|
|
/*
|
|
* Returns 1 if the page's buffers were dropped. The page is locked.
|
|
*
|
|
* Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
|
|
* in the buffers at page_buffers(page).
|
|
*
|
|
* even in -o notail mode, we can't be sure an old mount without -o notail
|
|
* didn't create files with tails.
|
|
*/
|
|
static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
|
|
struct buffer_head *head;
|
|
struct buffer_head *bh;
|
|
int ret = 1;
|
|
|
|
WARN_ON(PageChecked(page));
|
|
spin_lock(&j->j_dirty_buffers_lock);
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
if (bh->b_private) {
|
|
if (!buffer_dirty(bh) && !buffer_locked(bh)) {
|
|
reiserfs_free_jh(bh);
|
|
} else {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
if (ret)
|
|
ret = try_to_free_buffers(page);
|
|
spin_unlock(&j->j_dirty_buffers_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* We thank Mingming Cao for helping us understand in great detail what
|
|
* to do in this section of the code.
|
|
*/
|
|
static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
|
|
struct iov_iter *iter, loff_t offset)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
size_t count = iov_iter_count(iter);
|
|
ssize_t ret;
|
|
|
|
ret = blockdev_direct_IO(rw, iocb, inode, iter, offset,
|
|
reiserfs_get_blocks_direct_io);
|
|
|
|
/*
|
|
* In case of error extending write may have instantiated a few
|
|
* blocks outside i_size. Trim these off again.
|
|
*/
|
|
if (unlikely((rw & WRITE) && ret < 0)) {
|
|
loff_t isize = i_size_read(inode);
|
|
loff_t end = offset + count;
|
|
|
|
if ((end > isize) && inode_newsize_ok(inode, isize) == 0) {
|
|
truncate_setsize(inode, isize);
|
|
reiserfs_vfs_truncate_file(inode);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
unsigned int ia_valid;
|
|
int error;
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (error)
|
|
return error;
|
|
|
|
/* must be turned off for recursive notify_change calls */
|
|
ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
|
|
|
|
if (is_quota_modification(inode, attr))
|
|
dquot_initialize(inode);
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (attr->ia_valid & ATTR_SIZE) {
|
|
/*
|
|
* version 2 items will be caught by the s_maxbytes check
|
|
* done for us in vmtruncate
|
|
*/
|
|
if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
|
|
attr->ia_size > MAX_NON_LFS) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
error = -EFBIG;
|
|
goto out;
|
|
}
|
|
|
|
inode_dio_wait(inode);
|
|
|
|
/* fill in hole pointers in the expanding truncate case. */
|
|
if (attr->ia_size > inode->i_size) {
|
|
error = generic_cont_expand_simple(inode, attr->ia_size);
|
|
if (REISERFS_I(inode)->i_prealloc_count > 0) {
|
|
int err;
|
|
struct reiserfs_transaction_handle th;
|
|
/* we're changing at most 2 bitmaps, inode + super */
|
|
err = journal_begin(&th, inode->i_sb, 4);
|
|
if (!err) {
|
|
reiserfs_discard_prealloc(&th, inode);
|
|
err = journal_end(&th);
|
|
}
|
|
if (err)
|
|
error = err;
|
|
}
|
|
if (error) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
goto out;
|
|
}
|
|
/*
|
|
* file size is changed, ctime and mtime are
|
|
* to be updated
|
|
*/
|
|
attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
|
|
}
|
|
}
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
if ((((attr->ia_valid & ATTR_UID) && (from_kuid(&init_user_ns, attr->ia_uid) & ~0xffff)) ||
|
|
((attr->ia_valid & ATTR_GID) && (from_kgid(&init_user_ns, attr->ia_gid) & ~0xffff))) &&
|
|
(get_inode_sd_version(inode) == STAT_DATA_V1)) {
|
|
/* stat data of format v3.5 has 16 bit uid and gid */
|
|
error = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
|
|
(ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
|
|
struct reiserfs_transaction_handle th;
|
|
int jbegin_count =
|
|
2 *
|
|
(REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
|
|
REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
|
|
2;
|
|
|
|
error = reiserfs_chown_xattrs(inode, attr);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* (user+group)*(old+new) structure - we count quota
|
|
* info and , inode write (sb, inode)
|
|
*/
|
|
reiserfs_write_lock(inode->i_sb);
|
|
error = journal_begin(&th, inode->i_sb, jbegin_count);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (error)
|
|
goto out;
|
|
error = dquot_transfer(inode, attr);
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (error) {
|
|
journal_end(&th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Update corresponding info in inode so that everything
|
|
* is in one transaction
|
|
*/
|
|
if (attr->ia_valid & ATTR_UID)
|
|
inode->i_uid = attr->ia_uid;
|
|
if (attr->ia_valid & ATTR_GID)
|
|
inode->i_gid = attr->ia_gid;
|
|
mark_inode_dirty(inode);
|
|
error = journal_end(&th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size != i_size_read(inode)) {
|
|
error = inode_newsize_ok(inode, attr->ia_size);
|
|
if (!error) {
|
|
/*
|
|
* Could race against reiserfs_file_release
|
|
* if called from NFS, so take tailpack mutex.
|
|
*/
|
|
mutex_lock(&REISERFS_I(inode)->tailpack);
|
|
truncate_setsize(inode, attr->ia_size);
|
|
reiserfs_truncate_file(inode, 1);
|
|
mutex_unlock(&REISERFS_I(inode)->tailpack);
|
|
}
|
|
}
|
|
|
|
if (!error) {
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
if (!error && reiserfs_posixacl(inode->i_sb)) {
|
|
if (attr->ia_valid & ATTR_MODE)
|
|
error = reiserfs_acl_chmod(inode);
|
|
}
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
const struct address_space_operations reiserfs_address_space_operations = {
|
|
.writepage = reiserfs_writepage,
|
|
.readpage = reiserfs_readpage,
|
|
.readpages = reiserfs_readpages,
|
|
.releasepage = reiserfs_releasepage,
|
|
.invalidatepage = reiserfs_invalidatepage,
|
|
.write_begin = reiserfs_write_begin,
|
|
.write_end = reiserfs_write_end,
|
|
.bmap = reiserfs_aop_bmap,
|
|
.direct_IO = reiserfs_direct_IO,
|
|
.set_page_dirty = reiserfs_set_page_dirty,
|
|
};
|