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author | 2018-10-30 10:41:49 +1100 | |
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committer | 2018-10-30 10:41:49 +1100 | |
commit | 42ec3d4c02187a18e27ff94b409ec27234bf2ffd (patch) | |
tree | c9db04db8187c370718a43e6067af0e5aa944500 /fs/xfs/xfs_file.c | |
parent | vfs: remap helper should update destination inode metadata (diff) | |
download | linux-42ec3d4c02187a18e27ff94b409ec27234bf2ffd.tar.gz linux-42ec3d4c02187a18e27ff94b409ec27234bf2ffd.tar.bz2 linux-42ec3d4c02187a18e27ff94b409ec27234bf2ffd.zip |
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.c | 9 |
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 |