| Message ID | 153870032167.29072.11158511021942868400.stgit@magnolia (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fs: fixes for serious clone/dedupe problems | expand |
On Fri, Oct 5, 2018 at 3:46 AM Darrick J. Wong <darrick.wong@oracle.com> wrote: > > From: Darrick J. Wong <darrick.wong@oracle.com> > > Don't bother calling the filesystem for a zero-length dedupe request; > we can return zero and exit. > > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> > --- > fs/read_write.c | 5 +++++ > 1 file changed, 5 insertions(+) > > > diff --git a/fs/read_write.c b/fs/read_write.c > index 973d3da78c09..99b2f809180c 100644 > --- a/fs/read_write.c > +++ b/fs/read_write.c > @@ -1966,6 +1966,11 @@ int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, > if (!dst_file->f_op->dedupe_file_range) > goto out_drop_write; > > + if (len == 0) { > + ret = 0; > + goto out_drop_write; > + } > + > ret = dst_file->f_op->dedupe_file_range(src_file, src_pos, > dst_file, dst_pos, len); I suppose it is best to let user get the same errors he would get before this change rather than skipping zero length copy at vfs_dedupe_file_range() level, so looks fine. Thanks, Amir.
On Thu, Oct 04, 2018 at 05:45:21PM -0700, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@oracle.com> > > Don't bother calling the filesystem for a zero-length dedupe request; > we can return zero and exit. > > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Looks fine, Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/read_write.c b/fs/read_write.c index 973d3da78c09..99b2f809180c 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1966,6 +1966,11 @@ int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos, if (!dst_file->f_op->dedupe_file_range) goto out_drop_write; + if (len == 0) { + ret = 0; + goto out_drop_write; + } + ret = dst_file->f_op->dedupe_file_range(src_file, src_pos, dst_file, dst_pos, len); out_drop_write: