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Subject[PATCH v2] ceph: allow object copies across different filesystems in the same cluster
Date
OSDs are able to perform object copies across different pools.  Thus,
there's no need to prevent copy_file_range from doing remote copies if the
source and destination superblocks are different. Only return -EXDEV if
they have different fsid (the cluster ID).

Signed-off-by: Luis Henriques <lhenriques@suse.com>
---
fs/ceph/file.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)

Hi,

Here's the patch changelog since initial submittion:

- Dropped have_fsid checks on client structs
- Use %pU to print the fsid instead of raw hex strings (%*ph)
- Fixed 'To:' field in email so that this time the patch hits vger

Cheers,
--
Luis

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 685a03cc4b77..4a624a1dd0bb 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1904,6 +1904,7 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
struct ceph_inode_info *src_ci = ceph_inode(src_inode);
struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
struct ceph_cap_flush *prealloc_cf;
+ struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
struct ceph_object_locator src_oloc, dst_oloc;
struct ceph_object_id src_oid, dst_oid;
loff_t endoff = 0, size;
@@ -1915,8 +1916,17 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,

if (src_inode == dst_inode)
return -EINVAL;
- if (src_inode->i_sb != dst_inode->i_sb)
- return -EXDEV;
+ if (src_inode->i_sb != dst_inode->i_sb) {
+ struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
+
+ if (ceph_fsid_compare(&src_fsc->client->fsid,
+ &dst_fsc->client->fsid)) {
+ dout("Copying object across different clusters:");
+ dout(" src fsid: %pU dst fsid: %pU\n",
+ &src_fsc->client->fsid, &dst_fsc->client->fsid);
+ return -EXDEV;
+ }
+ }
if (ceph_snap(dst_inode) != CEPH_NOSNAP)
return -EROFS;

@@ -1928,7 +1938,7 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
* efficient).
*/

- if (ceph_test_mount_opt(ceph_inode_to_client(src_inode), NOCOPYFROM))
+ if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
return -EOPNOTSUPP;

if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
@@ -2044,7 +2054,7 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
dst_ci->i_vino.ino, dst_objnum);
/* Do an object remote copy */
err = ceph_osdc_copy_from(
- &ceph_inode_to_client(src_inode)->client->osdc,
+ &src_fsc->client->osdc,
src_ci->i_vino.snap, 0,
&src_oid, &src_oloc,
CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
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