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authorAmir Goldstein <amir73il@gmail.com>2019-06-05 08:04:50 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-06-09 10:06:20 -0700
commit5dae222a5ff0c269730393018a5539cc970a4726 (patch)
treee1e4e1634de00d8fb7668f575d7e25acace6518f /fs/fuse
parent8c3f406c097b83846c7d18438a905b49d17ae528 (diff)
vfs: allow copy_file_range to copy across devices
We want to enable cross-filesystem copy_file_range functionality where possible, so push the "same superblock only" checks down to the individual filesystem callouts so they can make their own decisions about cross-superblock copy offload and fallack to generic_copy_file_range() for cross-superblock copy. [Amir] We do not call ->remap_file_range() in case the files are not on the same sb and do not call ->copy_file_range() in case the files do not belong to the same filesystem driver. This changes behavior of the copy_file_range(2) syscall, which will now allow cross filesystem in-kernel copy. CIFS already supports cross-superblock copy, between two shares to the same server. This functionality will now be available via the copy_file_range(2) syscall. Cc: Steve French <stfrench@microsoft.com> Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 4c20bf61d9c3..dc342edb399b 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3142,6 +3142,9 @@ static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
if (fc->no_copy_file_range)
return -EOPNOTSUPP;
+ if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
+ return -EXDEV;
+
if (fc->writeback_cache) {
inode_lock(inode_in);
err = fuse_writeback_range(inode_in, pos_in, pos_in + len);
@@ -3203,7 +3206,7 @@ static ssize_t fuse_copy_file_range(struct file *src_file, loff_t src_off,
ret = __fuse_copy_file_range(src_file, src_off, dst_file, dst_off,
len, flags);
- if (ret == -EOPNOTSUPP)
+ if (ret == -EOPNOTSUPP || ret == -EXDEV)
ret = generic_copy_file_range(src_file, src_off, dst_file,
dst_off, len, flags);
return ret;