diff options
| author | Darrick J. Wong | 2018-10-30 10:41:49 +1100 |
|---|---|---|
| committer | Dave Chinner | 2018-10-30 10:41:49 +1100 |
| commit | 42ec3d4c02187a18e27ff94b409ec27234bf2ffd (patch) | |
| tree | c9db04db8187c370718a43e6067af0e5aa944500 /fs/nfs | |
| parent | 8dde90bca6fca3736ea20109654bcf6dcf2ecf1d (diff) | |
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/nfs')
| -rw-r--r-- | fs/nfs/nfs4file.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index ae5780ce41dc..46d691ba04bc 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -180,8 +180,8 @@ static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t return nfs42_proc_allocate(filep, offset, len); } -static int nfs42_remap_file_range(struct file *src_file, loff_t src_off, - struct file *dst_file, loff_t dst_off, u64 count, +static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off, + struct file *dst_file, loff_t dst_off, loff_t count, unsigned int remap_flags) { struct inode *dst_inode = file_inode(dst_file); @@ -244,7 +244,7 @@ out_unlock: inode_unlock(src_inode); } out: - return ret; + return ret < 0 ? ret : count; } #endif /* CONFIG_NFS_V4_2 */ |