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authorDarrick J. Wong <darrick.wong@oracle.com>2018-10-30 10:41:49 +1100
committerDave Chinner <david@fromorbit.com>2018-10-30 10:41:49 +1100
commit42ec3d4c02187a18e27ff94b409ec27234bf2ffd (patch)
treec9db04db8187c370718a43e6067af0e5aa944500 /fs/xfs/xfs_file.c
parent8dde90bca6fca3736ea20109654bcf6dcf2ecf1d (diff)
downloadlinux-42ec3d4c02187a18e27ff94b409ec27234bf2ffd.tar.bz2
vfs: make remap_file_range functions take and return bytes completed
Change the remap_file_range functions to take a number of bytes to operate upon and return the number of bytes they operated on. This is a requirement for allowing fs implementations to return short clone/dedupe results to the user, which will enable us to obey resource limits in a graceful manner. A subsequent patch will enable copy_file_range to signal to the ->clone_file_range implementation that it can handle a short length, which will be returned in the function's return value. For now the short return is not implemented anywhere so the behavior won't change -- either copy_file_range manages to clone the entire range or it tries an alternative. Neither clone ioctl can take advantage of this, alas. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_file.c')
-rw-r--r--fs/xfs/xfs_file.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 20314eb4677a..38fde4e11714 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -919,20 +919,23 @@ out_unlock:
return error;
}
-STATIC int
+STATIC loff_t
xfs_file_remap_range(
struct file *file_in,
loff_t pos_in,
struct file *file_out,
loff_t pos_out,
- u64 len,
+ loff_t len,
unsigned int remap_flags)
{
+ int ret;
+
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
return -EINVAL;
- return xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+ ret = xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, remap_flags);
+ return ret < 0 ? ret : len;
}
STATIC int