btrfs: remove outdated logic from overwrite_item() and add assertion

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As of commit 193df62457 ("btrfs: search for last logged dir index if
it's not cached in the inode"), the overwrite_item() function is always
called for a root that is from a fs/subvolume tree. In other words, now
it's only used during log replay to modify a fs/subvolume tree. Therefore
we can remove the logic that checks if we are dealing with a log tree at
overwrite_item().

So remove that logic, replacing it with an assertion and document that if
we ever need to support a log root there, we will need to clone the leaf
from the fs/subvolume tree and then release it before modifying the log
tree, which is needed to avoid a potential deadlock, similar to the one
recently fixed by a patch with the subject:

  "btrfs: do not modify log tree while holding a leaf from fs tree locked"

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

...

This commit is contained in:

Filipe Manana 2022-11-21 10:23:24 +00:00 • committed by David Sterba

parent 3a8d1db341

commit 3eb4234424

1 changed files with 9 additions and 5 deletions

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14

fs/btrfs/tree-log.c

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