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Btrfs: refactor btrfs_extent_same() slightly 

This was originally a prep patch for changing the behavior on len=0, but
we went another direction with that. This still makes the function
slightly easier to follow.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Omar Sandoval 2017-01-17 23:37:38 -08:00 committed by David Sterba
parent 310712b2f7
commit fc4badd9fe
1 changed files with 12 additions and 21 deletions
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33
fs/btrfs/ioctl.c
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@ -3125,26 +3125,27 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
int ret;
u64 len = olen;
struct cmp_pages cmp;
int same_inode = 0;
bool same_inode = (src == dst);
u64 same_lock_start = 0;
u64 same_lock_len = 0;
if (src == dst)
same_inode = 1;
if (len == 0)
return 0;
if (same_inode) {
if (same_inode)
inode_lock(src);
else
btrfs_double_inode_lock(src, dst);
ret = extent_same_check_offsets(src, loff, &len, olen);
if (ret)
goto out_unlock;
ret = extent_same_check_offsets(src, dst_loff, &len, olen);
if (ret)
goto out_unlock;
ret = extent_same_check_offsets(src, loff, &len, olen);
if (ret)
goto out_unlock;
ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
if (ret)
goto out_unlock;
if (same_inode) {
/*
* Single inode case wants the same checks, except we
* don't want our length pushed out past i_size as
@ -3172,16 +3173,6 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
same_lock_start = min_t(u64, loff, dst_loff);
same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
} else {
btrfs_double_inode_lock(src, dst);
ret = extent_same_check_offsets(src, loff, &len, olen);
if (ret)
goto out_unlock;
ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
if (ret)
goto out_unlock;
}
/* don't make the dst file partly checksummed */