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btrfs: use extent_map_end() at btrfs_drop_extent_map_range()

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Instead of open coding the end offset calculation of an extent map, use
the helper extent_map_end() and cache its result in a local variable,
since it's used several times.

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 2022-09-19 15:06:30 +01:00 • committed by David Sterba
parent 4c0c8cfc84
commit f3109e33bb
1 changed files with 6 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

10
fs/btrfs/extent_map.c
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@ -690,6 +690,7 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
} }
while (1) { while (1) {
struct extent_map *em; struct extent_map *em;
u64 em_end;
u64 gen; u64 gen;
unsigned long flags; unsigned long flags;
bool ends_after_range = false; bool ends_after_range = false;
@ -710,7 +711,8 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
write_unlock(&em_tree->lock); write_unlock(&em_tree->lock);
break; break;
} }
if (testend && em->start + em->len > start + len) em_end = extent_map_end(em);
if (testend && em_end > start + len)
ends_after_range = true; ends_after_range = true;
if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
if (ends_after_range) { if (ends_after_range) {
@ -718,9 +720,9 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
write_unlock(&em_tree->lock); write_unlock(&em_tree->lock);
break; break;
} }
start = em->start + em->len; start = em_end;
if (testend) if (testend)
len = start + len - (em->start + em->len); len = start + len - em_end;
free_extent_map(em); free_extent_map(em);
write_unlock(&em_tree->lock); write_unlock(&em_tree->lock);
continue; continue;
@ -767,7 +769,7 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
} }
if (ends_after_range) { if (ends_after_range) {
split->start = start + len; split->start = start + len;
split->len = em->start + em->len - (start + len); split->len = em_end - (start + len);
split->block_start = em->block_start; split->block_start = em->block_start;
split->flags = flags; split->flags = flags;
split->compress_type = em->compress_type; split->compress_type = em->compress_type;