xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

xfs: support returning partial reflink results

Browse Source 
Back when the XFS reflink code only supported clone_file_range, we were
only able to return zero or negative error codes to userspace.  However,
now that copy_file_range (which returns bytes copied) can use XFS'
clone_file_range, we have the opportunity to return partial results.
For example, if userspace sends a 1GB clone request and we run out of
space halfway through, we at least can tell userspace that we completed
512M of that request like a regular write.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong
2018-10-30 10:47:06 +11:00
committed by Dave Chinner
parent 9f04aaffdd
commit 3f68c1f562
3 changed files with 14 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
fs/xfs/xfs_file.c
View File

@@ -928,14 +928,11 @@ xfs_file_remap_range(
loff_t len,
unsigned int remap_flags)
{
int ret;
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
return -EINVAL;
ret = xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
return xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, remap_flags);
return ret < 0 ? ret : len;
}
STATIC int