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btrfs: Set io_tree only once in submit_compressed_extents

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The inode never changes so it's sufficient to dereference it and get
the iotree only once, before the execution of the main loop. No
functional changes, only the size of the function is decreased:

add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-44 (-44)
Function                                     old     new   delta
submit_compressed_extents                   1240    1196     -44
Total: Before=88476, After=88432, chg -0.05%

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2019-03-12 17:20:29 +02:00 committed by David Sterba
parent 69684c5a88
commit 4336650aff
1 changed files with 1 additions and 4 deletions
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5
fs/btrfs/inode.c
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@ -717,7 +717,7 @@ static noinline void submit_compressed_extents(struct async_chunk *async_chunk)
struct btrfs_key ins;
struct extent_map *em;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
int ret = 0;
again:
@ -725,9 +725,6 @@ static noinline void submit_compressed_extents(struct async_chunk *async_chunk)
async_extent = list_entry(async_chunk->extents.next,
struct async_extent, list);
list_del(&async_extent->list);
io_tree = &BTRFS_I(inode)->io_tree;
retry:
/* did the compression code fall back to uncompressed IO? */
if (!async_extent->pages) {