diff options
| author | Wang Jianchao <wangjianchao@kuaishou.com> | 2021-08-30 15:52:46 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2021-08-30 23:35:53 -0400 |
| commit | 5036ab8df278f9879d8958679bd043e32515a3e4 (patch) | |
| tree | 6faf71ad1579daab0cfca48cdac8b85388b88158 /fs | |
| parent | 55cdd0af2bc5ffc92a2deb745627755aecd5db33 (diff) | |
ext4: flush background discard kwork when retry allocation
The background discard kwork tries to mark blocks used and issue
discard. This can make filesystem suffer from NOSPC error, xfstest
generic/371 can fail due to it. Fix it by flushing discard kwork
in ext4_should_retry_alloc. At the same time, give up discard at
the moment.
Signed-off-by: Wang Jianchao <wangjianchao@kuaishou.com>
Link: https://lore.kernel.org/r/20210830075246.12516-6-jianchao.wan9@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/balloc.c | 8 | ||||
| -rw-r--r-- | fs/ext4/ext4.h | 1 | ||||
| -rw-r--r-- | fs/ext4/mballoc.c | 7 |
3 files changed, 13 insertions, 3 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index 9dc6e74b265c..a0fb0c4bdc7c 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -652,8 +652,14 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries) * possible we just missed a transaction commit that did so */ smp_mb(); - if (sbi->s_mb_free_pending == 0) + if (sbi->s_mb_free_pending == 0) { + if (test_opt(sb, DISCARD)) { + atomic_inc(&sbi->s_retry_alloc_pending); + flush_work(&sbi->s_discard_work); + atomic_dec(&sbi->s_retry_alloc_pending); + } return ext4_has_free_clusters(sbi, 1, 0); + } /* * it's possible we've just missed a transaction commit here, diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 6b678b968d84..d71dcac3b97f 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1538,6 +1538,7 @@ struct ext4_sb_info { after commit completed */ struct list_head s_discard_list; struct work_struct s_discard_work; + atomic_t s_retry_alloc_pending; struct rb_root s_mb_avg_fragment_size_root; rwlock_t s_mb_rb_lock; struct list_head *s_mb_largest_free_orders; diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 907b3577988c..34670cb63588 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3331,9 +3331,11 @@ static void ext4_discard_work(struct work_struct *work) load_grp = UINT_MAX; list_for_each_entry_safe(fd, nfd, &discard_list, efd_list) { /* - * If filesystem is umounting or no memory, give up the discard + * If filesystem is umounting or no memory or suffering + * from no space, give up the discard */ - if ((sb->s_flags & SB_ACTIVE) && !err) { + if ((sb->s_flags & SB_ACTIVE) && !err && + !atomic_read(&sbi->s_retry_alloc_pending)) { grp = fd->efd_group; if (grp != load_grp) { if (load_grp != UINT_MAX) @@ -3431,6 +3433,7 @@ int ext4_mb_init(struct super_block *sb) INIT_LIST_HEAD(&sbi->s_freed_data_list); INIT_LIST_HEAD(&sbi->s_discard_list); INIT_WORK(&sbi->s_discard_work, ext4_discard_work); + atomic_set(&sbi->s_retry_alloc_pending, 0); sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN; sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN; |