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Add GETFSMAP support; some performance improvements for very large 

file systems and for random write workloads into a preallocated file;
 bug fixes and cleanups.
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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:

 - add GETFSMAP support

 - some performance improvements for very large file systems and for
   random write workloads into a preallocated file

 - bug fixes and cleanups.

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  jbd2: cleanup write flags handling from jbd2_write_superblock()
  ext4: mark superblock writes synchronous for nobarrier mounts
  ext4: inherit encryption xattr before other xattrs
  ext4: replace BUG_ON with WARN_ONCE in ext4_end_bio()
  ext4: avoid unnecessary transaction stalls during writeback
  ext4: preload block group descriptors
  ext4: make ext4_shutdown() static
  ext4: support GETFSMAP ioctls
  vfs: add common GETFSMAP ioctl definitions
  ext4: evict inline data when writing to memory map
  ext4: remove ext4_xattr_check_entry()
  ext4: rename ext4_xattr_check_names() to ext4_xattr_check_entries()
  ext4: merge ext4_xattr_list() into ext4_listxattr()
  ext4: constify static data that is never modified
  ext4: trim return value and 'dir' argument from ext4_insert_dentry()
  jbd2: fix dbench4 performance regression for 'nobarrier' mounts
  jbd2: Fix lockdep splat with generic/270 test
  mm: retry writepages() on ENOMEM when doing an data integrity writeback
This commit is contained in:
Linus Torvalds 2017-05-08 11:30:05 -07:00
parent 13e0988140 17f423b516
commit dd727dad37
18 changed files with 1165 additions and 97 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/ext4/Makefile
View File

@ -4,11 +4,11 @@
obj-$(CONFIG_EXT4_FS) += ext4.o
ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o page-io.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
ext4_jbd2.o migrate.o mballoc.o block_validity.o move_extent.o \
mmp.o indirect.o extents_status.o xattr.o xattr_user.o \
xattr_trusted.o inline.o readpage.o sysfs.o
ext4-y := balloc.o bitmap.o block_validity.o dir.o ext4_jbd2.o extents.o \
extents_status.o file.o fsmap.o fsync.o hash.o ialloc.o \
indirect.o inline.o inode.o ioctl.o mballoc.o migrate.o \
mmp.o move_extent.o namei.o page-io.o readpage.o resize.o \
super.o symlink.o sysfs.o xattr.o xattr_trusted.o xattr_user.o
ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o

13
fs/ext4/ext4.h
View File

@ -2356,17 +2356,16 @@ extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
void *buf, int buf_size,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **dest_de);
int ext4_insert_dentry(struct inode *dir,
struct inode *inode,
struct ext4_dir_entry_2 *de,
int buf_size,
struct ext4_filename *fname);
void ext4_insert_dentry(struct inode *inode,
struct ext4_dir_entry_2 *de,
int buf_size,
struct ext4_filename *fname);
static inline void ext4_update_dx_flag(struct inode *inode)
{
if (!ext4_has_feature_dir_index(inode->i_sb))
ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
}
static unsigned char ext4_filetype_table[] = {
static const unsigned char ext4_filetype_table[] = {
DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
};
@ -3050,7 +3049,7 @@ extern int ext4_handle_dirty_dirent_node(handle_t *handle,
struct inode *inode,
struct buffer_head *bh);
#define S_SHIFT 12
static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
static const unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
[S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
[S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,

722
fs/ext4/fsmap.c Normal file
View File

@ -0,0 +1,722 @@
/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "ext4.h"
#include <linux/fsmap.h>
#include "fsmap.h"
#include "mballoc.h"
#include <linux/sort.h>
#include <linux/list_sort.h>
#include <trace/events/ext4.h>
/* Convert an ext4_fsmap to an fsmap. */
void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
struct ext4_fsmap *src)
{
dest->fmr_device = src->fmr_device;
dest->fmr_flags = src->fmr_flags;
dest->fmr_physical = src->fmr_physical << sb->s_blocksize_bits;
dest->fmr_owner = src->fmr_owner;
dest->fmr_offset = 0;
dest->fmr_length = src->fmr_length << sb->s_blocksize_bits;
dest->fmr_reserved[0] = 0;
dest->fmr_reserved[1] = 0;
dest->fmr_reserved[2] = 0;
}
/* Convert an fsmap to an ext4_fsmap. */
void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
struct fsmap *src)
{
dest->fmr_device = src->fmr_device;
dest->fmr_flags = src->fmr_flags;
dest->fmr_physical = src->fmr_physical >> sb->s_blocksize_bits;
dest->fmr_owner = src->fmr_owner;
dest->fmr_length = src->fmr_length >> sb->s_blocksize_bits;
}
/* getfsmap query state */
struct ext4_getfsmap_info {
struct ext4_fsmap_head *gfi_head;
ext4_fsmap_format_t gfi_formatter; /* formatting fn */
void *gfi_format_arg;/* format buffer */
ext4_fsblk_t gfi_next_fsblk; /* next fsblock we expect */
u32 gfi_dev; /* device id */
ext4_group_t gfi_agno; /* bg number, if applicable */
struct ext4_fsmap gfi_low; /* low rmap key */
struct ext4_fsmap gfi_high; /* high rmap key */
struct ext4_fsmap gfi_lastfree; /* free ext at end of last bg */
struct list_head gfi_meta_list; /* fixed metadata list */
bool gfi_last; /* last extent? */
};
/* Associate a device with a getfsmap handler. */
struct ext4_getfsmap_dev {
int (*gfd_fn)(struct super_block *sb,
struct ext4_fsmap *keys,
struct ext4_getfsmap_info *info);
u32 gfd_dev;
};
/* Compare two getfsmap device handlers. */
static int ext4_getfsmap_dev_compare(const void *p1, const void *p2)
{
const struct ext4_getfsmap_dev *d1 = p1;
const struct ext4_getfsmap_dev *d2 = p2;
return d1->gfd_dev - d2->gfd_dev;
}
/* Compare a record against our starting point */
static bool ext4_getfsmap_rec_before_low_key(struct ext4_getfsmap_info *info,
struct ext4_fsmap *rec)
{
return rec->fmr_physical < info->gfi_low.fmr_physical;
}
/*
* Format a reverse mapping for getfsmap, having translated rm_startblock
* into the appropriate daddr units.
*/
static int ext4_getfsmap_helper(struct super_block *sb,
struct ext4_getfsmap_info *info,
struct ext4_fsmap *rec)
{
struct ext4_fsmap fmr;
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_fsblk_t rec_fsblk = rec->fmr_physical;
ext4_group_t agno;
ext4_grpblk_t cno;
int error;
if (fatal_signal_pending(current))
return -EINTR;
/*
* Filter out records that start before our startpoint, if the
* caller requested that.
*/
if (ext4_getfsmap_rec_before_low_key(info, rec)) {
rec_fsblk += rec->fmr_length;
if (info->gfi_next_fsblk < rec_fsblk)
info->gfi_next_fsblk = rec_fsblk;
return EXT4_QUERY_RANGE_CONTINUE;
}
/* Are we just counting mappings? */
if (info->gfi_head->fmh_count == 0) {
if (rec_fsblk > info->gfi_next_fsblk)
info->gfi_head->fmh_entries++;
if (info->gfi_last)
return EXT4_QUERY_RANGE_CONTINUE;
info->gfi_head->fmh_entries++;
rec_fsblk += rec->fmr_length;
if (info->gfi_next_fsblk < rec_fsblk)
info->gfi_next_fsblk = rec_fsblk;
return EXT4_QUERY_RANGE_CONTINUE;
}
/*
* If the record starts past the last physical block we saw,
* then we've found a gap. Report the gap as being owned by
* whatever the caller specified is the missing owner.
*/
if (rec_fsblk > info->gfi_next_fsblk) {
if (info->gfi_head->fmh_entries >= info->gfi_head->fmh_count)
return EXT4_QUERY_RANGE_ABORT;
ext4_get_group_no_and_offset(sb, info->gfi_next_fsblk,
&agno, &cno);
trace_ext4_fsmap_mapping(sb, info->gfi_dev, agno,
EXT4_C2B(sbi, cno),
rec_fsblk - info->gfi_next_fsblk,
EXT4_FMR_OWN_UNKNOWN);
fmr.fmr_device = info->gfi_dev;
fmr.fmr_physical = info->gfi_next_fsblk;
fmr.fmr_owner = EXT4_FMR_OWN_UNKNOWN;
fmr.fmr_length = rec_fsblk - info->gfi_next_fsblk;
fmr.fmr_flags = FMR_OF_SPECIAL_OWNER;
error = info->gfi_formatter(&fmr, info->gfi_format_arg);
if (error)
return error;
info->gfi_head->fmh_entries++;
}
if (info->gfi_last)
goto out;
/* Fill out the extent we found */
if (info->gfi_head->fmh_entries >= info->gfi_head->fmh_count)
return EXT4_QUERY_RANGE_ABORT;
ext4_get_group_no_and_offset(sb, rec_fsblk, &agno, &cno);
trace_ext4_fsmap_mapping(sb, info->gfi_dev, agno, EXT4_C2B(sbi, cno),
rec->fmr_length, rec->fmr_owner);
fmr.fmr_device = info->gfi_dev;
fmr.fmr_physical = rec_fsblk;
fmr.fmr_owner = rec->fmr_owner;
fmr.fmr_flags = FMR_OF_SPECIAL_OWNER;
fmr.fmr_length = rec->fmr_length;
error = info->gfi_formatter(&fmr, info->gfi_format_arg);
if (error)
return error;
info->gfi_head->fmh_entries++;
out:
rec_fsblk += rec->fmr_length;
if (info->gfi_next_fsblk < rec_fsblk)
info->gfi_next_fsblk = rec_fsblk;
return EXT4_QUERY_RANGE_CONTINUE;
}
static inline ext4_fsblk_t ext4_fsmap_next_pblk(struct ext4_fsmap *fmr)
{
return fmr->fmr_physical + fmr->fmr_length;
}
/* Transform a blockgroup's free record into a fsmap */
static int ext4_getfsmap_datadev_helper(struct super_block *sb,
ext4_group_t agno, ext4_grpblk_t start,
ext4_grpblk_t len, void *priv)
{
struct ext4_fsmap irec;
struct ext4_getfsmap_info *info = priv;
struct ext4_fsmap *p;
struct ext4_fsmap *tmp;
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_fsblk_t fsb;
ext4_fsblk_t fslen;
int error;
fsb = (EXT4_C2B(sbi, start) + ext4_group_first_block_no(sb, agno));
fslen = EXT4_C2B(sbi, len);
/* If the retained free extent record is set... */
if (info->gfi_lastfree.fmr_owner) {
/* ...and abuts this one, lengthen it and return. */
if (ext4_fsmap_next_pblk(&info->gfi_lastfree) == fsb) {
info->gfi_lastfree.fmr_length += fslen;
return 0;
}
/*
* There's a gap between the two free extents; emit the
* retained extent prior to merging the meta_list.
*/
error = ext4_getfsmap_helper(sb, info, &info->gfi_lastfree);
if (error)
return error;
info->gfi_lastfree.fmr_owner = 0;
}
/* Merge in any relevant extents from the meta_list */
list_for_each_entry_safe(p, tmp, &info->gfi_meta_list, fmr_list) {
if (p->fmr_physical + p->fmr_length <= info->gfi_next_fsblk) {
list_del(&p->fmr_list);
kfree(p);
} else if (p->fmr_physical < fsb) {
error = ext4_getfsmap_helper(sb, info, p);
if (error)
return error;
list_del(&p->fmr_list);
kfree(p);
}
}
irec.fmr_device = 0;
irec.fmr_physical = fsb;
irec.fmr_length = fslen;
irec.fmr_owner = EXT4_FMR_OWN_FREE;
irec.fmr_flags = 0;
/* If this is a free extent at the end of a bg, buffer it. */
if (ext4_fsmap_next_pblk(&irec) ==
ext4_group_first_block_no(sb, agno + 1)) {
info->gfi_lastfree = irec;
return 0;
}
/* Otherwise, emit it */
return ext4_getfsmap_helper(sb, info, &irec);
}
/* Execute a getfsmap query against the log device. */
static int ext4_getfsmap_logdev(struct super_block *sb, struct ext4_fsmap *keys,
struct ext4_getfsmap_info *info)
{
journal_t *journal = EXT4_SB(sb)->s_journal;
struct ext4_fsmap irec;
/* Set up search keys */
info->gfi_low = keys[0];
info->gfi_low.fmr_length = 0;
memset(&info->gfi_high, 0xFF, sizeof(info->gfi_high));
trace_ext4_fsmap_low_key(sb, info->gfi_dev, 0,
info->gfi_low.fmr_physical,
info->gfi_low.fmr_length,
info->gfi_low.fmr_owner);
trace_ext4_fsmap_high_key(sb, info->gfi_dev, 0,
info->gfi_high.fmr_physical,
info->gfi_high.fmr_length,
info->gfi_high.fmr_owner);
if (keys[0].fmr_physical > 0)
return 0;
/* Fabricate an rmap entry for the external log device. */
irec.fmr_physical = journal->j_blk_offset;
irec.fmr_length = journal->j_maxlen;
irec.fmr_owner = EXT4_FMR_OWN_LOG;
irec.fmr_flags = 0;
return ext4_getfsmap_helper(sb, info, &irec);
}
/* Helper to fill out an ext4_fsmap. */
static inline int ext4_getfsmap_fill(struct list_head *meta_list,
ext4_fsblk_t fsb, ext4_fsblk_t len,
uint64_t owner)
{
struct ext4_fsmap *fsm;
fsm = kmalloc(sizeof(*fsm), GFP_NOFS);
if (!fsm)
return -ENOMEM;
fsm->fmr_device = 0;
fsm->fmr_flags = 0;
fsm->fmr_physical = fsb;
fsm->fmr_owner = owner;
fsm->fmr_length = len;
list_add_tail(&fsm->fmr_list, meta_list);
return 0;
}
/*
* This function returns the number of file system metadata blocks at
* the beginning of a block group, including the reserved gdt blocks.
*/
static unsigned int ext4_getfsmap_find_sb(struct super_block *sb,
ext4_group_t agno,
struct list_head *meta_list)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_fsblk_t fsb = ext4_group_first_block_no(sb, agno);
ext4_fsblk_t len;
unsigned long first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
unsigned long metagroup = agno / EXT4_DESC_PER_BLOCK(sb);
int error;
/* Record the superblock. */
if (ext4_bg_has_super(sb, agno)) {
error = ext4_getfsmap_fill(meta_list, fsb, 1, EXT4_FMR_OWN_FS);
if (error)
return error;
fsb++;
}
/* Record the group descriptors. */
len = ext4_bg_num_gdb(sb, agno);
if (!len)
return 0;
error = ext4_getfsmap_fill(meta_list, fsb, len,
EXT4_FMR_OWN_GDT);
if (error)
return error;
fsb += len;
/* Reserved GDT blocks */
if (!ext4_has_feature_meta_bg(sb) || metagroup < first_meta_bg) {
len = le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks);
error = ext4_getfsmap_fill(meta_list, fsb, len,
EXT4_FMR_OWN_RESV_GDT);
if (error)
return error;
}
return 0;
}
/* Compare two fsmap items. */
static int ext4_getfsmap_compare(void *priv,
struct list_head *a,
struct list_head *b)
{
struct ext4_fsmap *fa;
struct ext4_fsmap *fb;
fa = container_of(a, struct ext4_fsmap, fmr_list);
fb = container_of(b, struct ext4_fsmap, fmr_list);
if (fa->fmr_physical < fb->fmr_physical)
return -1;
else if (fa->fmr_physical > fb->fmr_physical)
return 1;
return 0;
}
/* Merge adjacent extents of fixed metadata. */
static void ext4_getfsmap_merge_fixed_metadata(struct list_head *meta_list)
{
struct ext4_fsmap *p;
struct ext4_fsmap *prev = NULL;
struct ext4_fsmap *tmp;
list_for_each_entry_safe(p, tmp, meta_list, fmr_list) {
if (!prev) {
prev = p;
continue;
}
if (prev->fmr_owner == p->fmr_owner &&
prev->fmr_physical + prev->fmr_length == p->fmr_physical) {
prev->fmr_length += p->fmr_length;
list_del(&p->fmr_list);
kfree(p);
} else
prev = p;
}
}
/* Free a list of fixed metadata. */
static void ext4_getfsmap_free_fixed_metadata(struct list_head *meta_list)
{
struct ext4_fsmap *p;
struct ext4_fsmap *tmp;
list_for_each_entry_safe(p, tmp, meta_list, fmr_list) {
list_del(&p->fmr_list);
kfree(p);
}
}
/* Find all the fixed metadata in the filesystem. */
int ext4_getfsmap_find_fixed_metadata(struct super_block *sb,
struct list_head *meta_list)
{
struct ext4_group_desc *gdp;
ext4_group_t agno;
int error;
INIT_LIST_HEAD(meta_list);
/* Collect everything. */
for (agno = 0; agno < EXT4_SB(sb)->s_groups_count; agno++) {
gdp = ext4_get_group_desc(sb, agno, NULL);
if (!gdp) {
error = -EFSCORRUPTED;
goto err;
}
/* Superblock & GDT */
error = ext4_getfsmap_find_sb(sb, agno, meta_list);
if (error)
goto err;
/* Block bitmap */
error = ext4_getfsmap_fill(meta_list,
ext4_block_bitmap(sb, gdp), 1,
EXT4_FMR_OWN_BLKBM);
if (error)
goto err;
/* Inode bitmap */
error = ext4_getfsmap_fill(meta_list,
ext4_inode_bitmap(sb, gdp), 1,
EXT4_FMR_OWN_INOBM);
if (error)
goto err;
/* Inodes */
error = ext4_getfsmap_fill(meta_list,
ext4_inode_table(sb, gdp),
EXT4_SB(sb)->s_itb_per_group,
EXT4_FMR_OWN_INODES);
if (error)
goto err;
}
/* Sort the list */
list_sort(NULL, meta_list, ext4_getfsmap_compare);
/* Merge adjacent extents */
ext4_getfsmap_merge_fixed_metadata(meta_list);
return 0;
err:
ext4_getfsmap_free_fixed_metadata(meta_list);
return error;
}
/* Execute a getfsmap query against the buddy bitmaps */
static int ext4_getfsmap_datadev(struct super_block *sb,
struct ext4_fsmap *keys,
struct ext4_getfsmap_info *info)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_fsblk_t start_fsb;
ext4_fsblk_t end_fsb;
ext4_fsblk_t eofs;
ext4_group_t start_ag;
ext4_group_t end_ag;
ext4_grpblk_t first_cluster;
ext4_grpblk_t last_cluster;
int error = 0;
eofs = ext4_blocks_count(sbi->s_es);
if (keys[0].fmr_physical >= eofs)
return 0;
if (keys[1].fmr_physical >= eofs)
keys[1].fmr_physical = eofs - 1;
start_fsb = keys[0].fmr_physical;
end_fsb = keys[1].fmr_physical;
/* Determine first and last group to examine based on start and end */
ext4_get_group_no_and_offset(sb, start_fsb, &start_ag, &first_cluster);
ext4_get_group_no_and_offset(sb, end_fsb, &end_ag, &last_cluster);
/*
* Convert the fsmap low/high keys to bg based keys. Initialize
* low to the fsmap low key and max out the high key to the end
* of the bg.
*/
info->gfi_low = keys[0];
info->gfi_low.fmr_physical = EXT4_C2B(sbi, first_cluster);
info->gfi_low.fmr_length = 0;
memset(&info->gfi_high, 0xFF, sizeof(info->gfi_high));
/* Assemble a list of all the fixed-location metadata. */
error = ext4_getfsmap_find_fixed_metadata(sb, &info->gfi_meta_list);
if (error)
goto err;
/* Query each bg */
for (info->gfi_agno = start_ag;
info->gfi_agno <= end_ag;
info->gfi_agno++) {
/*
* Set the bg high key from the fsmap high key if this
* is the last bg that we're querying.
*/
if (info->gfi_agno == end_ag) {
info->gfi_high = keys[1];
info->gfi_high.fmr_physical = EXT4_C2B(sbi,
last_cluster);
info->gfi_high.fmr_length = 0;
}
trace_ext4_fsmap_low_key(sb, info->gfi_dev, info->gfi_agno,
info->gfi_low.fmr_physical,
info->gfi_low.fmr_length,
info->gfi_low.fmr_owner);
trace_ext4_fsmap_high_key(sb, info->gfi_dev, info->gfi_agno,
info->gfi_high.fmr_physical,
info->gfi_high.fmr_length,
info->gfi_high.fmr_owner);
error = ext4_mballoc_query_range(sb, info->gfi_agno,
EXT4_B2C(sbi, info->gfi_low.fmr_physical),
EXT4_B2C(sbi, info->gfi_high.fmr_physical),
ext4_getfsmap_datadev_helper, info);
if (error)
goto err;
/*
* Set the bg low key to the start of the bg prior to
* moving on to the next bg.
*/
if (info->gfi_agno == start_ag)
memset(&info->gfi_low, 0, sizeof(info->gfi_low));
}
/* Do we have a retained free extent? */
if (info->gfi_lastfree.fmr_owner) {
error = ext4_getfsmap_helper(sb, info, &info->gfi_lastfree);
if (error)
goto err;
}
/* Report any gaps at the end of the bg */
info->gfi_last = true;
error = ext4_getfsmap_datadev_helper(sb, end_ag, last_cluster, 0, info);
if (error)
goto err;
err:
ext4_getfsmap_free_fixed_metadata(&info->gfi_meta_list);
return error;
}
/* Do we recognize the device? */
static bool ext4_getfsmap_is_valid_device(struct super_block *sb,
struct ext4_fsmap *fm)
{
if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX ||
fm->fmr_device == new_encode_dev(sb->s_bdev->bd_dev))
return true;
if (EXT4_SB(sb)->journal_bdev &&
fm->fmr_device == new_encode_dev(EXT4_SB(sb)->journal_bdev->bd_dev))
return true;
return false;
}
/* Ensure that the low key is less than the high key. */
static bool ext4_getfsmap_check_keys(struct ext4_fsmap *low_key,
struct ext4_fsmap *high_key)
{
if (low_key->fmr_device > high_key->fmr_device)
return false;
if (low_key->fmr_device < high_key->fmr_device)
return true;
if (low_key->fmr_physical > high_key->fmr_physical)
return false;
if (low_key->fmr_physical < high_key->fmr_physical)
return true;
if (low_key->fmr_owner > high_key->fmr_owner)
return false;
if (low_key->fmr_owner < high_key->fmr_owner)
return true;
return false;
}
#define EXT4_GETFSMAP_DEVS 2
/*
* Get filesystem's extents as described in head, and format for
* output. Calls formatter to fill the user's buffer until all
* extents are mapped, until the passed-in head->fmh_count slots have
* been filled, or until the formatter short-circuits the loop, if it
* is tracking filled-in extents on its own.
*
* Key to Confusion
* ----------------
* There are multiple levels of keys and counters at work here:
* _fsmap_head.fmh_keys -- low and high fsmap keys passed in;
* these reflect fs-wide block addrs.
* dkeys -- fmh_keys used to query each device;
* these are fmh_keys but w/ the low key
* bumped up by fmr_length.
* _getfsmap_info.gfi_next_fsblk-- next fs block we expect to see; this
* is how we detect gaps in the fsmap
* records and report them.
* _getfsmap_info.gfi_low/high -- per-bg low/high keys computed from
* dkeys; used to query the free space.
*/
int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
ext4_fsmap_format_t formatter, void *arg)
{
struct ext4_fsmap dkeys[2]; /* per-dev keys */
struct ext4_getfsmap_dev handlers[EXT4_GETFSMAP_DEVS];
struct ext4_getfsmap_info info = {0};
int i;
int error = 0;
if (head->fmh_iflags & ~FMH_IF_VALID)
return -EINVAL;
if (!ext4_getfsmap_is_valid_device(sb, &head->fmh_keys[0]) ||
!ext4_getfsmap_is_valid_device(sb, &head->fmh_keys[1]))
return -EINVAL;
head->fmh_entries = 0;
/* Set up our device handlers. */
memset(handlers, 0, sizeof(handlers));
handlers[0].gfd_dev = new_encode_dev(sb->s_bdev->bd_dev);
handlers[0].gfd_fn = ext4_getfsmap_datadev;
if (EXT4_SB(sb)->journal_bdev) {
handlers[1].gfd_dev = new_encode_dev(
EXT4_SB(sb)->journal_bdev->bd_dev);
handlers[1].gfd_fn = ext4_getfsmap_logdev;
}
sort(handlers, EXT4_GETFSMAP_DEVS, sizeof(struct ext4_getfsmap_dev),
ext4_getfsmap_dev_compare, NULL);
/*
* To continue where we left off, we allow userspace to use the
* last mapping from a previous call as the low key of the next.
* This is identified by a non-zero length in the low key. We
* have to increment the low key in this scenario to ensure we
* don't return the same mapping again, and instead return the
* very next mapping.
*
* Bump the physical offset as there can be no other mapping for
* the same physical block range.
*/
dkeys[0] = head->fmh_keys[0];
dkeys[0].fmr_physical += dkeys[0].fmr_length;
dkeys[0].fmr_owner = 0;
dkeys[0].fmr_length = 0;
memset(&dkeys[1], 0xFF, sizeof(struct ext4_fsmap));
if (!ext4_getfsmap_check_keys(dkeys, &head->fmh_keys[1]))
return -EINVAL;
info.gfi_next_fsblk = head->fmh_keys[0].fmr_physical +
head->fmh_keys[0].fmr_length;
info.gfi_formatter = formatter;
info.gfi_format_arg = arg;
info.gfi_head = head;
/* For each device we support... */
for (i = 0; i < EXT4_GETFSMAP_DEVS; i++) {
/* Is this device within the range the user asked for? */
if (!handlers[i].gfd_fn)
continue;
if (head->fmh_keys[0].fmr_device > handlers[i].gfd_dev)
continue;
if (head->fmh_keys[1].fmr_device < handlers[i].gfd_dev)
break;
/*
* If this device number matches the high key, we have
* to pass the high key to the handler to limit the
* query results. If the device number exceeds the
* low key, zero out the low key so that we get
* everything from the beginning.
*/
if (handlers[i].gfd_dev == head->fmh_keys[1].fmr_device)
dkeys[1] = head->fmh_keys[1];
if (handlers[i].gfd_dev > head->fmh_keys[0].fmr_device)
memset(&dkeys[0], 0, sizeof(struct ext4_fsmap));
info.gfi_dev = handlers[i].gfd_dev;
info.gfi_last = false;
info.gfi_agno = -1;
error = handlers[i].gfd_fn(sb, dkeys, &info);
if (error)
break;
info.gfi_next_fsblk = 0;
}
head->fmh_oflags = FMH_OF_DEV_T;
return error;
}

69
fs/ext4/fsmap.h Normal file
View File

@ -0,0 +1,69 @@
/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __EXT4_FSMAP_H__
#define __EXT4_FSMAP_H__
struct fsmap;
/* internal fsmap representation */
struct ext4_fsmap {
struct list_head fmr_list;
dev_t fmr_device; /* device id */
uint32_t fmr_flags; /* mapping flags */
uint64_t fmr_physical; /* device offset of segment */
uint64_t fmr_owner; /* owner id */
uint64_t fmr_length; /* length of segment, blocks */
};
struct ext4_fsmap_head {
uint32_t fmh_iflags; /* control flags */
uint32_t fmh_oflags; /* output flags */
unsigned int fmh_count; /* # of entries in array incl. input */
unsigned int fmh_entries; /* # of entries filled in (output). */
struct ext4_fsmap fmh_keys[2]; /* low and high keys */
};
void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
struct ext4_fsmap *src);
void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
struct fsmap *src);
/* fsmap to userspace formatter - copy to user & advance pointer */
typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
ext4_fsmap_format_t formatter, void *arg);
#define EXT4_QUERY_RANGE_ABORT 1
#define EXT4_QUERY_RANGE_CONTINUE 0
/* fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
#define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */
#define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */
#define EXT4_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */
#define EXT4_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */
#define EXT4_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */
#define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */
#define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */
#define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* inode bitmap */
#define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* block bitmap */
#endif /* __EXT4_FSMAP_H__ */

17
fs/ext4/ialloc.c
View File

@ -1098,6 +1098,17 @@ got:
if (err)
goto fail_drop;
/*
* Since the encryption xattr will always be unique, create it first so
* that it's less likely to end up in an external xattr block and
* prevent its deduplication.
*/
if (encrypt) {
err = fscrypt_inherit_context(dir, inode, handle, true);
if (err)
goto fail_free_drop;
}
err = ext4_init_acl(handle, inode, dir);
if (err)
goto fail_free_drop;
@ -1119,12 +1130,6 @@ got:
ei->i_datasync_tid = handle->h_transaction->t_tid;
}
if (encrypt) {
err = fscrypt_inherit_context(dir, inode, handle, true);
if (err)
goto fail_free_drop;
}
err = ext4_mark_inode_dirty(handle, inode);
if (err) {
ext4_std_error(sb, err);

2
fs/ext4/inline.c
View File

@ -1034,7 +1034,7 @@ static int ext4_add_dirent_to_inline(handle_t *handle,
err = ext4_journal_get_write_access(handle, iloc->bh);
if (err)
return err;
ext4_insert_dentry(dir, inode, de, inline_size, fname);
ext4_insert_dentry(inode, de, inline_size, fname);
ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);

40
fs/ext4/inode.c
View File

@ -1643,6 +1643,7 @@ struct mpage_da_data {
*/
struct ext4_map_blocks map;
struct ext4_io_submit io_submit; /* IO submission data */
unsigned int do_map:1;
};
static void mpage_release_unused_pages(struct mpage_da_data *mpd,
@ -2179,6 +2180,9 @@ static bool mpage_add_bh_to_extent(struct mpage_da_data *mpd, ext4_lblk_t lblk,
/* First block in the extent? */
if (map->m_len == 0) {
/* We cannot map unless handle is started... */
if (!mpd->do_map)
return false;
map->m_lblk = lblk;
map->m_len = 1;
map->m_flags = bh->b_state & BH_FLAGS;
@ -2231,6 +2235,9 @@ static int mpage_process_page_bufs(struct mpage_da_data *mpd,
/* Found extent to map? */
if (mpd->map.m_len)
return 0;
/* Buffer needs mapping and handle is not started? */
if (!mpd->do_map)
return 0;
/* Everything mapped so far and we hit EOF */
break;
}
@ -2747,6 +2754,29 @@ retry:
tag_pages_for_writeback(mapping, mpd.first_page, mpd.last_page);
done = false;
blk_start_plug(&plug);
/*
* First writeback pages that don't need mapping - we can avoid
* starting a transaction unnecessarily and also avoid being blocked
* in the block layer on device congestion while having transaction
* started.
*/
mpd.do_map = 0;
mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL);
if (!mpd.io_submit.io_end) {
ret = -ENOMEM;
goto unplug;
}
ret = mpage_prepare_extent_to_map(&mpd);
/* Submit prepared bio */
ext4_io_submit(&mpd.io_submit);
ext4_put_io_end_defer(mpd.io_submit.io_end);
mpd.io_submit.io_end = NULL;
/* Unlock pages we didn't use */
mpage_release_unused_pages(&mpd, false);
if (ret < 0)
goto unplug;
while (!done && mpd.first_page <= mpd.last_page) {
/* For each extent of pages we use new io_end */
mpd.io_submit.io_end = ext4_init_io_end(inode, GFP_KERNEL);
@ -2775,8 +2805,10 @@ retry:
wbc->nr_to_write, inode->i_ino, ret);
/* Release allocated io_end */
ext4_put_io_end(mpd.io_submit.io_end);
mpd.io_submit.io_end = NULL;
break;
}
mpd.do_map = 1;
trace_ext4_da_write_pages(inode, mpd.first_page, mpd.wbc);
ret = mpage_prepare_extent_to_map(&mpd);
@ -2807,6 +2839,7 @@ retry:
if (!ext4_handle_valid(handle) || handle->h_sync == 0) {
ext4_journal_stop(handle);
handle = NULL;
mpd.do_map = 0;
}
/* Submit prepared bio */
ext4_io_submit(&mpd.io_submit);
@ -2824,6 +2857,7 @@ retry:
ext4_journal_stop(handle);
} else
ext4_put_io_end(mpd.io_submit.io_end);
mpd.io_submit.io_end = NULL;
if (ret == -ENOSPC && sbi->s_journal) {
/*
@ -2839,6 +2873,7 @@ retry:
if (ret)
break;
}
unplug:
blk_finish_plug(&plug);
if (!ret && !cycled && wbc->nr_to_write > 0) {
cycled = 1;
@ -5855,6 +5890,11 @@ int ext4_page_mkwrite(struct vm_fault *vmf)
file_update_time(vma->vm_file);
down_read(&EXT4_I(inode)->i_mmap_sem);
ret = ext4_convert_inline_data(inode);
if (ret)
goto out_ret;
/* Delalloc case is easy... */
if (test_opt(inode->i_sb, DELALLOC) &&
!ext4_should_journal_data(inode) &&

92
fs/ext4/ioctl.c
View File

@ -19,6 +19,9 @@
#include <linux/delay.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include <linux/fsmap.h>
#include "fsmap.h"
#include <trace/events/ext4.h>
/**
* Swap memory between @a and @b for @len bytes.
@ -443,7 +446,7 @@ static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
return iflags;
}
int ext4_shutdown(struct super_block *sb, unsigned long arg)
static int ext4_shutdown(struct super_block *sb, unsigned long arg)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
__u32 flags;
@ -489,6 +492,90 @@ int ext4_shutdown(struct super_block *sb, unsigned long arg)
return 0;
}
struct getfsmap_info {
struct super_block *gi_sb;
struct fsmap_head __user *gi_data;
unsigned int gi_idx;
__u32 gi_last_flags;
};
static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
{
struct getfsmap_info *info = priv;
struct fsmap fm;
trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
info->gi_last_flags = xfm->fmr_flags;
ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
sizeof(struct fsmap)))
return -EFAULT;
return 0;
}
static int ext4_ioc_getfsmap(struct super_block *sb,
struct fsmap_head __user *arg)
{
struct getfsmap_info info = {0};
struct ext4_fsmap_head xhead = {0};
struct fsmap_head head;
bool aborted = false;
int error;
if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
return -EFAULT;
if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
sizeof(head.fmh_keys[0].fmr_reserved)) ||
memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
sizeof(head.fmh_keys[1].fmr_reserved)))
return -EINVAL;
/*
* ext4 doesn't report file extents at all, so the only valid
* file offsets are the magic ones (all zeroes or all ones).
*/
if (head.fmh_keys[0].fmr_offset ||
(head.fmh_keys[1].fmr_offset != 0 &&
head.fmh_keys[1].fmr_offset != -1ULL))
return -EINVAL;
xhead.fmh_iflags = head.fmh_iflags;
xhead.fmh_count = head.fmh_count;
ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
info.gi_sb = sb;
info.gi_data = arg;
error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
if (error == EXT4_QUERY_RANGE_ABORT) {
error = 0;
aborted = true;
} else if (error)
return error;
/* If we didn't abort, set the "last" flag in the last fmx */
if (!aborted && info.gi_idx) {
info.gi_last_flags |= FMR_OF_LAST;
if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
&info.gi_last_flags,
sizeof(info.gi_last_flags)))
return -EFAULT;
}
/* copy back header */
head.fmh_entries = xhead.fmh_entries;
head.fmh_oflags = xhead.fmh_oflags;
if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
return -EFAULT;
return 0;
}
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@ -499,6 +586,8 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
switch (cmd) {
case FS_IOC_GETFSMAP:
return ext4_ioc_getfsmap(sb, (void __user *)arg);
case EXT4_IOC_GETFLAGS:
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
return put_user(flags, (int __user *) arg);
@ -1007,6 +1096,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case EXT4_IOC_GET_ENCRYPTION_PWSALT:
case EXT4_IOC_GET_ENCRYPTION_POLICY:
case EXT4_IOC_SHUTDOWN:
case FS_IOC_GETFSMAP:
break;
default:
return -ENOIOCTLCMD;

51
fs/ext4/mballoc.c
View File

@ -357,7 +357,7 @@ static struct kmem_cache *ext4_free_data_cachep;
#define NR_GRPINFO_CACHES 8
static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES];
static const char *ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = {
static const char * const ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = {
"ext4_groupinfo_1k", "ext4_groupinfo_2k", "ext4_groupinfo_4k",
"ext4_groupinfo_8k", "ext4_groupinfo_16k", "ext4_groupinfo_32k",
"ext4_groupinfo_64k", "ext4_groupinfo_128k"
@ -5277,3 +5277,52 @@ out:
range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits;
return ret;
}
/* Iterate all the free extents in the group. */
int
ext4_mballoc_query_range(
struct super_block *sb,
ext4_group_t group,
ext4_grpblk_t start,
ext4_grpblk_t end,
ext4_mballoc_query_range_fn formatter,
void *priv)
{
void *bitmap;
ext4_grpblk_t next;
struct ext4_buddy e4b;
int error;
error = ext4_mb_load_buddy(sb, group, &e4b);
if (error)
return error;
bitmap = e4b.bd_bitmap;
ext4_lock_group(sb, group);
start = (e4b.bd_info->bb_first_free > start) ?
e4b.bd_info->bb_first_free : start;
if (end >= EXT4_CLUSTERS_PER_GROUP(sb))
end = EXT4_CLUSTERS_PER_GROUP(sb) - 1;
while (start <= end) {
start = mb_find_next_zero_bit(bitmap, end + 1, start);
if (start > end)
break;
next = mb_find_next_bit(bitmap, end + 1, start);
ext4_unlock_group(sb, group);
error = formatter(sb, group, start, next - start, priv);
if (error)
goto out_unload;
ext4_lock_group(sb, group);
start = next + 1;
}
ext4_unlock_group(sb, group);
out_unload:
ext4_mb_unload_buddy(&e4b);
return error;
}

17
fs/ext4/mballoc.h
View File

@ -199,4 +199,21 @@ static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
return ext4_group_first_block_no(sb, fex->fe_group) +
(fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
}
typedef int (*ext4_mballoc_query_range_fn)(
struct super_block *sb,
ext4_group_t agno,
ext4_grpblk_t start,
ext4_grpblk_t len,
void *priv);
int
ext4_mballoc_query_range(
struct super_block *sb,
ext4_group_t agno,
ext4_grpblk_t start,
ext4_grpblk_t end,
ext4_mballoc_query_range_fn formatter,
void *priv);
#endif

17
fs/ext4/namei.c
View File

@ -1869,11 +1869,10 @@ return_result:
return res;
}
int ext4_insert_dentry(struct inode *dir,
struct inode *inode,
struct ext4_dir_entry_2 *de,
int buf_size,
struct ext4_filename *fname)
void ext4_insert_dentry(struct inode *inode,
struct ext4_dir_entry_2 *de,
int buf_size,
struct ext4_filename *fname)
{
int nlen, rlen;
@ -1892,7 +1891,6 @@ int ext4_insert_dentry(struct inode *dir,
ext4_set_de_type(inode->i_sb, de, inode->i_mode);
de->name_len = fname_len(fname);
memcpy(de->name, fname_name(fname), fname_len(fname));
return 0;
}
/*
@ -1928,11 +1926,8 @@ static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
return err;
}
/* By now the buffer is marked for journaling. Due to crypto operations,
* the following function call may fail */
err = ext4_insert_dentry(dir, inode, de, blocksize, fname);
if (err < 0)
return err;
/* By now the buffer is marked for journaling */
ext4_insert_dentry(inode, de, blocksize, fname);
/*
* XXX shouldn't update any times until successful

11
fs/ext4/page-io.c
View File

@ -297,8 +297,17 @@ static void ext4_end_bio(struct bio *bio)
{
ext4_io_end_t *io_end = bio->bi_private;
sector_t bi_sector = bio->bi_iter.bi_sector;
char b[BDEVNAME_SIZE];
BUG_ON(!io_end);
if (WARN_ONCE(!io_end, "io_end is NULL: %s: sector %Lu len %u err %d\n",
bdevname(bio->bi_bdev, b),
(long long) bio->bi_iter.bi_sector,
(unsigned) bio_sectors(bio),
bio->bi_error)) {
ext4_finish_bio(bio);
bio_put(bio);
return;
}
bio->bi_end_io = NULL;
if (bio->bi_error) {

14
fs/ext4/super.c
View File

@ -49,6 +49,7 @@
#include "xattr.h"
#include "acl.h"
#include "mballoc.h"
#include "fsmap.h"
#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>
@ -1230,7 +1231,7 @@ static const struct fscrypt_operations ext4_cryptops = {
#endif
#ifdef CONFIG_QUOTA
static char *quotatypes[] = INITQFNAMES;
static const char * const quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
static int ext4_write_dquot(struct dquot *dquot);
@ -1443,7 +1444,8 @@ static ext4_fsblk_t get_sb_block(void **data)
}
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
static const char deprecated_msg[] =
"Mount option \"%s\" will be removed by %s\n"
"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
#ifdef CONFIG_QUOTA
@ -3898,6 +3900,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
bgl_lock_init(sbi->s_blockgroup_lock);
/* Pre-read the descriptors into the buffer cache */
for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logical_sb_block, i);
sb_breadahead(sb, block);
}
for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logical_sb_block, i);
sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
@ -4650,7 +4658,7 @@ static int ext4_commit_super(struct super_block *sb, int sync)
if (sync) {
unlock_buffer(sbh);
error = __sync_dirty_buffer(sbh,
test_opt(sb, BARRIER) ? REQ_FUA : REQ_SYNC);
REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
if (error)
return error;

8
fs/ext4/sysfs.c
View File

@ -34,7 +34,7 @@ typedef enum {
ptr_ext4_super_block_offset,
} attr_ptr_t;
static const char *proc_dirname = "fs/ext4";
static const char proc_dirname[] = "fs/ext4";
static struct proc_dir_entry *ext4_proc_root;
struct ext4_attr {
@ -375,7 +375,7 @@ static const struct file_operations ext4_seq_##name##_fops = { \
PROC_FILE_SHOW_DEFN(es_shrinker_info);
PROC_FILE_SHOW_DEFN(options);
static struct ext4_proc_files {
static const struct ext4_proc_files {
const char *name;
const struct file_operations *fops;
} proc_files[] = {
@ -388,7 +388,7 @@ static struct ext4_proc_files {
int ext4_register_sysfs(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_proc_files *p;
const struct ext4_proc_files *p;
int err;
sbi->s_kobj.kset = &ext4_kset;
@ -412,7 +412,7 @@ int ext4_register_sysfs(struct super_block *sb)
void ext4_unregister_sysfs(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_proc_files *p;
const struct ext4_proc_files *p;
if (sbi->s_proc) {
for (p = proc_files; p->name; p++)

63
fs/ext4/xattr.c
View File

@ -78,10 +78,8 @@ static struct buffer_head *ext4_xattr_cache_find(struct inode *,
struct mb_cache_entry **);
static void ext4_xattr_rehash(struct ext4_xattr_header *,
struct ext4_xattr_entry *);
static int ext4_xattr_list(struct dentry *dentry, char *buffer,
size_t buffer_size);
static const struct xattr_handler *ext4_xattr_handler_map[] = {
static const struct xattr_handler * const ext4_xattr_handler_map[] = {
[EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler,
#ifdef CONFIG_EXT4_FS_POSIX_ACL
[EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
@ -163,20 +161,9 @@ ext4_xattr_handler(int name_index)
return handler;
}
/*
* Inode operation listxattr()
*
* d_inode(dentry)->i_mutex: don't care
*/
ssize_t
ext4_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
return ext4_xattr_list(dentry, buffer, size);
}
static int
ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end,
void *value_start)
ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end,
void *value_start)
{
struct ext4_xattr_entry *e = entry;
@ -230,8 +217,8 @@ ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh)
return -EFSCORRUPTED;
if (!ext4_xattr_block_csum_verify(inode, bh))
return -EFSBADCRC;
error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size,
bh->b_data);
error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size,
bh->b_data);
if (!error)
set_buffer_verified(bh);
return error;
@ -246,7 +233,7 @@ __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header,
if (end - (void *)header < sizeof(*header) + sizeof(u32) ||
(header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)))
goto errout;
error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header));
error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header));
errout:
if (error)
__ext4_error_inode(inode, function, line, 0,
@ -257,20 +244,9 @@ errout:
#define xattr_check_inode(inode, header, end) \
__xattr_check_inode((inode), (header), (end), __func__, __LINE__)
static inline int
ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size)
{
size_t value_size = le32_to_cpu(entry->e_value_size);
if (entry->e_value_block != 0 || value_size > size ||
le16_to_cpu(entry->e_value_offs) + value_size > size)
return -EFSCORRUPTED;
return 0;
}
static int
ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index,
const char *name, size_t size, int sorted)
const char *name, int sorted)
{
struct ext4_xattr_entry *entry;
size_t name_len;
@ -290,8 +266,6 @@ ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index,
break;
}
*pentry = entry;
if (!cmp && ext4_xattr_check_entry(entry, size))
return -EFSCORRUPTED;
return cmp ? -ENODATA : 0;
}
@ -319,7 +293,6 @@ ext4_xattr_block_get(struct inode *inode, int name_index, const char *name,
ea_bdebug(bh, "b_count=%d, refcount=%d",
atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount));
if (ext4_xattr_check_block(inode, bh)) {
bad_block:
EXT4_ERROR_INODE(inode, "bad block %llu",
EXT4_I(inode)->i_file_acl);
error = -EFSCORRUPTED;
@ -327,9 +300,7 @@ bad_block:
}
ext4_xattr_cache_insert(ext4_mb_cache, bh);
entry = BFIRST(bh);
error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1);
if (error == -EFSCORRUPTED)
goto bad_block;
error = ext4_xattr_find_entry(&entry, name_index, name, 1);
if (error)
goto cleanup;
size = le32_to_cpu(entry->e_value_size);
@ -366,13 +337,12 @@ ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name,
return error;
raw_inode = ext4_raw_inode(&iloc);
header = IHDR(inode, raw_inode);
entry = IFIRST(header);
end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
error = xattr_check_inode(inode, header, end);
if (error)
goto cleanup;
error = ext4_xattr_find_entry(&entry, name_index, name,
end - (void *)entry, 0);
entry = IFIRST(header);
error = ext4_xattr_find_entry(&entry, name_index, name, 0);
if (error)
goto cleanup;
size = le32_to_cpu(entry->e_value_size);
@ -519,7 +489,9 @@ cleanup:
}
/*
* ext4_xattr_list()
* Inode operation listxattr()
*
* d_inode(dentry)->i_rwsem: don't care
*
* Copy a list of attribute names into the buffer
* provided, or compute the buffer size required.
@ -528,8 +500,8 @@ cleanup:
* Returns a negative error number on failure, or the number of bytes
* used / required on success.
*/
static int
ext4_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)
ssize_t
ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
int ret, ret2;
@ -804,7 +776,7 @@ ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i,
bs->s.end = bs->bh->b_data + bs->bh->b_size;
bs->s.here = bs->s.first;
error = ext4_xattr_find_entry(&bs->s.here, i->name_index,
i->name, bs->bh->b_size, 1);
i->name, 1);
if (error && error != -ENODATA)
goto cleanup;
bs->s.not_found = error;
@ -1076,8 +1048,7 @@ int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
return error;
/* Find the named attribute. */
error = ext4_xattr_find_entry(&is->s.here, i->name_index,
i->name, is->s.end -
(void *)is->s.base, 0);
i->name, 0);
if (error && error != -ENODATA)
return error;
is->s.not_found = error;

28
fs/jbd2/journal.c
View File

@ -700,8 +700,21 @@ int jbd2_log_wait_commit(journal_t *journal, tid_t tid)
{
int err = 0;
jbd2_might_wait_for_commit(journal);
read_lock(&journal->j_state_lock);
#ifdef CONFIG_PROVE_LOCKING
/*
* Some callers make sure transaction is already committing and in that
* case we cannot block on open handles anymore. So don't warn in that
* case.
*/
if (tid_gt(tid, journal->j_commit_sequence) &&
(!journal->j_committing_transaction ||
journal->j_committing_transaction->t_tid != tid)) {
read_unlock(&journal->j_state_lock);
jbd2_might_wait_for_commit(journal);
read_lock(&journal->j_state_lock);
}
#endif
#ifdef CONFIG_JBD2_DEBUG
if (!tid_geq(journal->j_commit_request, tid)) {
printk(KERN_ERR
@ -922,7 +935,8 @@ int __jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block)
* space and if we lose sb update during power failure we'd replay
* old transaction with possibly newly overwritten data.
*/
ret = jbd2_journal_update_sb_log_tail(journal, tid, block, REQ_FUA);
ret = jbd2_journal_update_sb_log_tail(journal, tid, block,
REQ_SYNC | REQ_FUA);
if (ret)
goto out;
@ -1323,7 +1337,7 @@ static int journal_reset(journal_t *journal)
jbd2_journal_update_sb_log_tail(journal,
journal->j_tail_sequence,
journal->j_tail,
REQ_FUA);
REQ_SYNC | REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
}
return jbd2_journal_start_thread(journal);
@ -1463,7 +1477,7 @@ void jbd2_journal_update_sb_errno(journal_t *journal)
sb->s_errno = cpu_to_be32(journal->j_errno);
read_unlock(&journal->j_state_lock);
jbd2_write_superblock(journal, REQ_FUA);
jbd2_write_superblock(journal, REQ_SYNC | REQ_FUA);
}
EXPORT_SYMBOL(jbd2_journal_update_sb_errno);
@ -1730,7 +1744,7 @@ int jbd2_journal_destroy(journal_t *journal)
write_unlock(&journal->j_state_lock);
jbd2_mark_journal_empty(journal,
REQ_PREFLUSH | REQ_FUA);
REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
} else
err = -EIO;
@ -1989,7 +2003,7 @@ int jbd2_journal_flush(journal_t *journal)
* the magic code for a fully-recovered superblock. Any future
* commits of data to the journal will restore the current
* s_start value. */
jbd2_mark_journal_empty(journal, REQ_FUA);
jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
write_lock(&journal->j_state_lock);
J_ASSERT(!journal->j_running_transaction);
@ -2035,7 +2049,7 @@ int jbd2_journal_wipe(journal_t *journal, int write)
if (write) {
/* Lock to make assertions happy... */
mutex_lock(&journal->j_checkpoint_mutex);
jbd2_mark_journal_empty(journal, REQ_FUA);
jbd2_mark_journal_empty(journal, REQ_SYNC | REQ_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
}

74
include/trace/events/ext4.h
View File

@ -15,6 +15,7 @@ struct ext4_inode_info;
struct mpage_da_data;
struct ext4_map_blocks;
struct extent_status;
struct ext4_fsmap;
#define EXT4_I(inode) (container_of(inode, struct ext4_inode_info, vfs_inode))
@ -2529,6 +2530,79 @@ TRACE_EVENT(ext4_es_shrink,
__entry->scan_time, __entry->nr_skipped, __entry->retried)
);
/* fsmap traces */
DECLARE_EVENT_CLASS(ext4_fsmap_class,
TP_PROTO(struct super_block *sb, u32 keydev, u32 agno, u64 bno, u64 len,
u64 owner),
TP_ARGS(sb, keydev, agno, bno, len, owner),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(dev_t, keydev)
__field(u32, agno)
__field(u64, bno)
__field(u64, len)
__field(u64, owner)
),
TP_fast_assign(
__entry->dev = sb->s_bdev->bd_dev;
__entry->keydev = new_decode_dev(keydev);
__entry->agno = agno;
__entry->bno = bno;
__entry->len = len;
__entry->owner = owner;
),
TP_printk("dev %d:%d keydev %d:%d agno %u bno %llu len %llu owner %lld\n",
MAJOR(__entry->dev), MINOR(__entry->dev),
MAJOR(__entry->keydev), MINOR(__entry->keydev),
__entry->agno,
__entry->bno,
__entry->len,
__entry->owner)
)
#define DEFINE_FSMAP_EVENT(name) \
DEFINE_EVENT(ext4_fsmap_class, name, \
TP_PROTO(struct super_block *sb, u32 keydev, u32 agno, u64 bno, u64 len, \
u64 owner), \
TP_ARGS(sb, keydev, agno, bno, len, owner))
DEFINE_FSMAP_EVENT(ext4_fsmap_low_key);
DEFINE_FSMAP_EVENT(ext4_fsmap_high_key);
DEFINE_FSMAP_EVENT(ext4_fsmap_mapping);
DECLARE_EVENT_CLASS(ext4_getfsmap_class,
TP_PROTO(struct super_block *sb, struct ext4_fsmap *fsmap),
TP_ARGS(sb, fsmap),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(dev_t, keydev)
__field(u64, block)
__field(u64, len)
__field(u64, owner)
__field(u64, flags)
),
TP_fast_assign(
__entry->dev = sb->s_bdev->bd_dev;
__entry->keydev = new_decode_dev(fsmap->fmr_device);
__entry->block = fsmap->fmr_physical;
__entry->len = fsmap->fmr_length;
__entry->owner = fsmap->fmr_owner;
__entry->flags = fsmap->fmr_flags;
),
TP_printk("dev %d:%d keydev %d:%d block %llu len %llu owner %lld flags 0x%llx\n",
MAJOR(__entry->dev), MINOR(__entry->dev),
MAJOR(__entry->keydev), MINOR(__entry->keydev),
__entry->block,
__entry->len,
__entry->owner,
__entry->flags)
)
#define DEFINE_GETFSMAP_EVENT(name) \
DEFINE_EVENT(ext4_getfsmap_class, name, \
TP_PROTO(struct super_block *sb, struct ext4_fsmap *fsmap), \
TP_ARGS(sb, fsmap))
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_low_key);
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_high_key);
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_mapping);
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */

14
mm/page-writeback.c
View File

@ -2352,10 +2352,16 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
if (wbc->nr_to_write <= 0)
return 0;
if (mapping->a_ops->writepages)
ret = mapping->a_ops->writepages(mapping, wbc);
else
ret = generic_writepages(mapping, wbc);
while (1) {
if (mapping->a_ops->writepages)
ret = mapping->a_ops->writepages(mapping, wbc);
else
ret = generic_writepages(mapping, wbc);
if ((ret != -ENOMEM) || (wbc->sync_mode != WB_SYNC_ALL))
break;
cond_resched();
congestion_wait(BLK_RW_ASYNC, HZ/50);
}
return ret;
}