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for-6.4-rc3-tag

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Merge tag 'for-6.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - handle memory allocation error in checksumming helper (reported by
   syzbot)

 - fix lockdep splat when aborting a transaction, add NOFS protection
   around invalidate_inode_pages2 that could allocate with GFP_KERNEL

 - reduce chances to hit an ENOSPC during scrub with RAID56 profiles

* tag 'for-6.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: use nofs when cleaning up aborted transactions
  btrfs: handle memory allocation failure in btrfs_csum_one_bio
  btrfs: scrub: try harder to mark RAID56 block groups read-only
This commit is contained in:
Linus Torvalds 2023-05-26 13:21:38 -07:00
commit b158dd941b
4 changed files with 32 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/btrfs/block-group.c
View File

@ -2818,10 +2818,20 @@ int btrfs_inc_block_group_ro(struct btrfs_block_group *cache,
}
ret = inc_block_group_ro(cache, 0);
if (!do_chunk_alloc || ret == -ETXTBSY)
goto unlock_out;
if (!ret)
goto out;
if (ret == -ETXTBSY)
goto unlock_out;
/*
* Skip chunk alloction if the bg is SYSTEM, this is to avoid system
* chunk allocation storm to exhaust the system chunk array. Otherwise
* we still want to try our best to mark the block group read-only.
*/
if (!do_chunk_alloc && ret == -ENOSPC &&
(cache->flags & BTRFS_BLOCK_GROUP_SYSTEM))
goto unlock_out;
alloc_flags = btrfs_get_alloc_profile(fs_info, cache->space_info->flags);
ret = btrfs_chunk_alloc(trans, alloc_flags, CHUNK_ALLOC_FORCE);
if (ret < 0)

9
fs/btrfs/disk-io.c
View File

@ -4936,7 +4936,11 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
*/
inode = igrab(&btrfs_inode->vfs_inode);
if (inode) {
unsigned int nofs_flag;
nofs_flag = memalloc_nofs_save();
invalidate_inode_pages2(inode->i_mapping);
memalloc_nofs_restore(nofs_flag);
iput(inode);
}
spin_lock(&root->delalloc_lock);
@ -5042,7 +5046,12 @@ static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache)
inode = cache->io_ctl.inode;
if (inode) {
unsigned int nofs_flag;
nofs_flag = memalloc_nofs_save();
invalidate_inode_pages2(inode->i_mapping);
memalloc_nofs_restore(nofs_flag);
BTRFS_I(inode)->generation = 0;
cache->io_ctl.inode = NULL;
iput(inode);

4
fs/btrfs/file-item.c
View File

@ -792,7 +792,9 @@ blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio)
sums = kvzalloc(btrfs_ordered_sum_size(fs_info,
bytes_left), GFP_KERNEL);
memalloc_nofs_restore(nofs_flag);
BUG_ON(!sums); /* -ENOMEM */
if (!sums)
return BLK_STS_RESOURCE;
sums->len = bytes_left;
ordered = btrfs_lookup_ordered_extent(inode,
offset);

9
fs/btrfs/scrub.c
View File

@ -2518,13 +2518,20 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
if (ret == 0) {
ro_set = 1;
} else if (ret == -ENOSPC && !sctx->is_dev_replace) {
} else if (ret == -ENOSPC && !sctx->is_dev_replace &&
!(cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK)) {
/*
* btrfs_inc_block_group_ro return -ENOSPC when it
* failed in creating new chunk for metadata.
* It is not a problem for scrub, because
* metadata are always cowed, and our scrub paused
* commit_transactions.
*
* For RAID56 chunks, we have to mark them read-only
* for scrub, as later we would use our own cache
* out of RAID56 realm.
* Thus we want the RAID56 bg to be marked RO to
* prevent RMW from screwing up out cache.
*/
ro_set = 0;
} else if (ret == -ETXTBSY) {