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btrfs: cleanup: use for() loop in btrfs_map_bio() 

for() is obviously better in these code block, and remove noused
init-value to reduce about 6 bytes binary size.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Zhao Lei 2015-02-12 15:42:16 +08:00 committed by David Sterba
parent a688a04aab
commit 08da757d3f
1 changed files with 3 additions and 6 deletions
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9
fs/btrfs/volumes.c
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@ -5820,8 +5820,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
u64 length = 0;
u64 map_length;
int ret;
int dev_nr = 0;
int total_devs = 1;
int dev_nr;
int total_devs;
struct btrfs_bio *bbio = NULL;
length = bio->bi_iter.bi_size;
@ -5862,11 +5862,10 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
BUG();
}
while (dev_nr < total_devs) {
for (dev_nr = 0; dev_nr < total_devs; dev_nr++) {
dev = bbio->stripes[dev_nr].dev;
if (!dev || !dev->bdev || (rw & WRITE && !dev->writeable)) {
bbio_error(bbio, first_bio, logical);
dev_nr++;
continue;
}
@ -5879,7 +5878,6 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
ret = breakup_stripe_bio(root, bbio, first_bio, dev,
dev_nr, rw, async_submit);
BUG_ON(ret);
dev_nr++;
continue;
}
@ -5894,7 +5892,6 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
submit_stripe_bio(root, bbio, bio,
bbio->stripes[dev_nr].physical, dev_nr, rw,
async_submit);
dev_nr++;
}
btrfs_bio_counter_dec(root->fs_info);
return 0;