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btrfs: get next entry in tree_search_offset before doing checks

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This is a small optimisation since the currently 'entry' is already
checked in the if () {} else if {} construct above the loop. In essence
the first iteration of the final while loop is redundant. To eliminate
this extra check simply get the next entry at the beginning of the loop.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2021-11-22 17:16:46 +02:00 committed by David Sterba
parent bbf27275f2
commit 167c0bd377
1 changed files with 4 additions and 5 deletions
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9
fs/btrfs/free-space-cache.c
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@ -1730,6 +1730,10 @@ tree_search_offset(struct btrfs_free_space_ctl *ctl,
return NULL;
while (1) {
n = rb_next(&entry->offset_index);
if (!n)
return NULL;
entry = rb_entry(n, struct btrfs_free_space, offset_index);
if (entry->bitmap) {
if (entry->offset + BITS_PER_BITMAP *
ctl->unit > offset)
@ -1738,11 +1742,6 @@ tree_search_offset(struct btrfs_free_space_ctl *ctl,
if (entry->offset + entry->bytes > offset)
break;
}
n = rb_next(&entry->offset_index);
if (!n)
return NULL;
entry = rb_entry(n, struct btrfs_free_space, offset_index);
}
return entry;
}