From 42ec3d4c02187a18e27ff94b409ec27234bf2ffd Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Tue, 30 Oct 2018 10:41:49 +1100 Subject: 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 Reviewed-by: Amir Goldstein Signed-off-by: Dave Chinner --- fs/ocfs2/file.c | 16 ++++++++-------- fs/ocfs2/refcounttree.c | 2 +- fs/ocfs2/refcounttree.h | 2 +- 3 files changed, 10 insertions(+), 10 deletions(-) (limited to 'fs/ocfs2') 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 = { diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c index df9781567ec0..6a42c04ac0ab 100644 --- a/fs/ocfs2/refcounttree.c +++ b/fs/ocfs2/refcounttree.c @@ -4824,7 +4824,7 @@ int ocfs2_reflink_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) { struct inode *inode_in = file_inode(file_in); diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h index d2c5f526edff..eb65c1d0843c 100644 --- a/fs/ocfs2/refcounttree.h +++ b/fs/ocfs2/refcounttree.h @@ -119,7 +119,7 @@ int ocfs2_reflink_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); #endif /* OCFS2_REFCOUNTTREE_H */ -- cgit v1.2.3