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ext4: ext4_read_bh_lock() should submit IO if the buffer isn't uptodate 

commit 0b73284c56 upstream.

Recently we notice that ext4 filesystem would occasionally fail to read
metadata from disk and report error message, but the disk and block
layer looks fine. After analyse, we lockon commit 88dbcbb3a4
("blkdev: avoid migration stalls for blkdev pages"). It provide a
migration method for the bdev, we could move page that has buffers
without extra users now, but it lock the buffers on the page, which
breaks the fragile metadata read operation on ext4 filesystem,
ext4_read_bh_lock() was copied from ll_rw_block(), it depends on the
assumption of that locked buffer means it is under IO. So it just
trylock the buffer and skip submit IO if it lock failed, after
wait_on_buffer() we conclude IO error because the buffer is not
uptodate.

This issue could be easily reproduced by add some delay just after
buffer_migrate_lock_buffers() in __buffer_migrate_folio() and do
fsstress on ext4 filesystem.

  EXT4-fs error (device pmem1): __ext4_find_entry:1658: inode #73193:
  comm fsstress: reading directory lblock 0
  EXT4-fs error (device pmem1): __ext4_find_entry:1658: inode #75334:
  comm fsstress: reading directory lblock 0

Fix it by removing the trylock logic in ext4_read_bh_lock(), just lock
the buffer and submit IO if it's not uptodate, and also leave over
readahead helper.

Cc: stable@kernel.org
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220831074629.3755110-1-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhang Yi 2022-08-31 15:46:29 +08:00 committed by Greg Kroah-Hartman
parent 1f5e643b38
commit 46e5f470a1
1 changed files with 5 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/ext4/super.c
View File

@ -186,19 +186,12 @@ int ext4_read_bh(struct buffer_head *bh, int op_flags, bh_end_io_t *end_io)
int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait)
{
if (trylock_buffer(bh)) {
if (wait)
return ext4_read_bh(bh, op_flags, NULL);
lock_buffer(bh);
if (!wait) {
ext4_read_bh_nowait(bh, op_flags, NULL);
return 0;
}
if (wait) {
wait_on_buffer(bh);
if (buffer_uptodate(bh))
return 0;
return -EIO;
}
return 0;
return ext4_read_bh(bh, op_flags, NULL);
}
/*
@ -245,7 +238,8 @@ void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
if (likely(bh)) {
ext4_read_bh_lock(bh, REQ_RAHEAD, false);
if (trylock_buffer(bh))
ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL);
brelse(bh);
}
}