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| author | Amir Goldstein <amir73il@gmail.com> | 2019-06-05 08:04:50 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2019-06-09 10:06:20 -0700 |
| commit | 5dae222a5ff0c269730393018a5539cc970a4726 (patch) | |
| tree | e1e4e1634de00d8fb7668f575d7e25acace6518f /fs/fuse | |
| parent | 8c3f406c097b83846c7d18438a905b49d17ae528 (diff) | |
| download | linux-5dae222a5ff0c269730393018a5539cc970a4726.tar.gz linux-5dae222a5ff0c269730393018a5539cc970a4726.tar.bz2 linux-5dae222a5ff0c269730393018a5539cc970a4726.zip | |
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.c | 5 |
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; |