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btrfs: add missing path cache update during fiemap 

When looking the stored result for a cached path node, if the stored
result is valid and has a value of true, we must update all the nodes for
all levels below it with a result of true as well. This is necessary when
moving from one leaf in the fs tree to the next one, as well as when
moving from a node at any level to the next node at the same level.

Currently this logic is missing as it was somehow forgotten by a recent
patch with the subject: "btrfs: speedup checking for extent sharedness
during fiemap".

This adds the missing logic, which is the counter part to what we do
when adding a shared node to the cache at store_backref_shared_cache().

Fixes: 12a824dc67 ("btrfs: speedup checking for extent sharedness during fiemap")
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2022-10-03 15:57:30 +01:00 committed by David Sterba
parent cbddcc4fa3
commit 96dbcc0072
1 changed files with 13 additions and 0 deletions
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13
fs/btrfs/backref.c
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@ -1557,6 +1557,19 @@ static bool lookup_backref_shared_cache(struct btrfs_backref_shared_cache *cache
return false;
*is_shared = entry->is_shared;
/*
* If the node at this level is shared, than all nodes below are also
* shared. Currently some of the nodes below may be marked as not shared
* because we have just switched from one leaf to another, and switched
* also other nodes above the leaf and below the current level, so mark
* them as shared.
*/
if (*is_shared) {
for (int i = 0; i < level; i++) {
cache->entries[i].is_shared = true;
cache->entries[i].gen = entry->gen;
}
}
return true;
}