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ceph: add ceph.snap.btime vxattr 

The ceph.snap.btime virtual xattr provides the snapshot creation (birth)
time in $secs.$nsecs format.

Link: https://tracker.ceph.com/issues/38838
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
David Disseldorp 2019-04-18 14:15:47 +02:00 committed by Ilya Dryomov
parent 193e7b3762
commit 100cc610a5
1 changed files with 27 additions and 0 deletions
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27
fs/ceph/xattr.c
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@ -273,6 +273,19 @@ static size_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
return snprintf(val, size, "%llu", ci->i_max_files);
}
/* snapshots */
static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
{
return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
}
static size_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
size_t size)
{
return snprintf(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
ci->i_snap_btime.tv_nsec);
}
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
#define CEPH_XATTR_NAME2(_type, _name, _name2) \
XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@ -341,6 +354,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
},
XATTR_QUOTA_FIELD(quota, max_bytes),
XATTR_QUOTA_FIELD(quota, max_files),
{
.name = "ceph.snap.btime",
.name_size = sizeof("ceph.snap.btime"),
.getxattr_cb = ceph_vxattrcb_snap_btime,
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
{ .name = NULL, 0 } /* Required table terminator */
};
static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
@ -360,6 +380,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = {
XATTR_LAYOUT_FIELD(file, layout, object_size),
XATTR_LAYOUT_FIELD(file, layout, pool),
XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
{
.name = "ceph.snap.btime",
.name_size = sizeof("ceph.snap.btime"),
.getxattr_cb = ceph_vxattrcb_snap_btime,
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
{ .name = NULL, 0 } /* Required table terminator */
};
static size_t ceph_file_vxattrs_name_size; /* total size of all names */