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SubjectRe: [PATCH v3] ceph: allow object copies across different filesystems in the same cluster
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On Mon, 2019-09-09 at 16:48 +0100, Luis Henriques wrote:
> 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 | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> Hi,
>
> Here's the changelog:
>
> * since v2
>
> - single dout() in error path
>
> * since v1:
>
> - 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..846cf5aea85e 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 +1916,16 @@ 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 files across clusters: src: %pU dst: %pU\n",
> + &src_fsc->client->fsid, &dst_fsc->client->fsid);
> + return -EXDEV;
> + }
> + }
> if (ceph_snap(dst_inode) != CEPH_NOSNAP)
> return -EROFS;
>
> @@ -1928,7 +1937,7 @@ 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 +2053,7 @@ 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 |

Thanks Luis. Merged into testing branch.
--
Jeff Layton <jlayton@kernel.org>

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