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authorDarrick J. Wong <darrick.wong@oracle.com>2018-10-30 00:41:49 +0100
committerDave Chinner <david@fromorbit.com>2018-10-30 00:41:49 +0100
commit42ec3d4c02187a18e27ff94b409ec27234bf2ffd (patch)
treec9db04db8187c370718a43e6067af0e5aa944500 /fs/ocfs2/file.c
parentvfs: remap helper should update destination inode metadata (diff)
downloadlinux-42ec3d4c02187a18e27ff94b409ec27234bf2ffd.tar.xz
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/ocfs2/file.c')
-rw-r--r--fs/ocfs2/file.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 9809b0e5746f..fbaeafe44b5f 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2527,18 +2527,18 @@ out:
return offset;
}
-static int ocfs2_remap_file_range(struct file *file_in,
- loff_t pos_in,
- struct file *file_out,
- loff_t pos_out,
- u64 len,
- unsigned int remap_flags)
+static loff_t ocfs2_remap_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ loff_t len, unsigned int remap_flags)
{
+ int ret;
+
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
return -EINVAL;
- return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
- len, remap_flags);
+ ret = ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+ len, remap_flags);
+ return ret < 0 ? ret : len;
}
const struct inode_operations ocfs2_file_iops = {