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SubjectRe: [PATCH v2] ceph: allow object copies across different filesystems in the same cluster
On Mon, Sep 9, 2019 at 12:29 PM Luis Henriques <lhenriques@suse.com> 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 | 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);

Hi Luis,

This should be a single dout.

Thanks,

Ilya

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