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btrfs: reada: Jump into cleanup in direct way for __readahead_hook()

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Current code set nritems to 0 to make for_loop useless to bypass it,
and set generation's value which is not necessary.
Jump into cleanup directly is better choise.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei 2015-12-31 22:20:59 +08:00 committed by David Sterba
parent 02873e4325
commit 57f16e0826
1 changed files with 21 additions and 19 deletions
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28
fs/btrfs/reada.c
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@ -130,26 +130,26 @@ static void __readahead_hook(struct btrfs_fs_info *fs_info,
re->scheduled_for = NULL; re->scheduled_for = NULL;
spin_unlock(&re->lock); spin_unlock(&re->lock);
if (err == 0) {
nritems = level ? btrfs_header_nritems(eb) : 0;
generation = btrfs_header_generation(eb);
/*
* FIXME: currently we just set nritems to 0 if this is a leaf,
* effectively ignoring the content. In a next step we could
* trigger more readahead depending from the content, e.g.
* fetch the checksums for the extents in the leaf.
*/
} else {
/* /*
* this is the error case, the extent buffer has not been * this is the error case, the extent buffer has not been
* read correctly. We won't access anything from it and * read correctly. We won't access anything from it and
* just cleanup our data structures. Effectively this will * just cleanup our data structures. Effectively this will
* cut the branch below this node from read ahead. * cut the branch below this node from read ahead.
*/ */
nritems = 0; if (err)
generation = 0; goto cleanup;
}
/*
* FIXME: currently we just set nritems to 0 if this is a leaf,
* effectively ignoring the content. In a next step we could
* trigger more readahead depending from the content, e.g.
* fetch the checksums for the extents in the leaf.
*/
if (!level)
goto cleanup;
nritems = btrfs_header_nritems(eb);
generation = btrfs_header_generation(eb);
for (i = 0; i < nritems; i++) { for (i = 0; i < nritems; i++) {
struct reada_extctl *rec; struct reada_extctl *rec;
u64 n_gen; u64 n_gen;
@ -188,6 +188,8 @@ static void __readahead_hook(struct btrfs_fs_info *fs_info,
reada_add_block(rc, bytenr, &next_key, n_gen); reada_add_block(rc, bytenr, &next_key, n_gen);
} }
} }
cleanup:
/* /*
* free extctl records * free extctl records
*/ */