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ceph: check if mds create snaprealm when setting quota 

If mds does not, return -EOPNOTSUPP.

Link: http://tracker.ceph.com/issues/23491
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2018-04-08 09:54:39 +08:00 committed by Ilya Dryomov
parent 6d08b06e67
commit f191982689
1 changed files with 25 additions and 3 deletions
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28
fs/ceph/xattr.c
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@ -228,7 +228,15 @@ static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
{
return (ci->i_max_files || ci->i_max_bytes);
bool ret = false;
spin_lock(&ci->i_ceph_lock);
if ((ci->i_max_files || ci->i_max_bytes) &&
ci->i_vino.snap == CEPH_NOSNAP &&
ci->i_snap_realm &&
ci->i_snap_realm->ino == ci->i_vino.ino)
ret = true;
spin_unlock(&ci->i_ceph_lock);
return ret;
}
static size_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
@ -1008,14 +1016,19 @@ int __ceph_setxattr(struct inode *inode, const char *name,
char *newval = NULL;
struct ceph_inode_xattr *xattr = NULL;
int required_blob_size;
bool check_realm = false;
bool lock_snap_rwsem = false;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
vxattr = ceph_match_vxattr(inode, name);
if (vxattr && vxattr->readonly)
return -EOPNOTSUPP;
if (vxattr) {
if (vxattr->readonly)
return -EOPNOTSUPP;
if (value && !strncmp(vxattr->name, "ceph.quota", 10))
check_realm = true;
}
/* pass any unhandled ceph.* xattrs through to the MDS */
if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
@ -1109,6 +1122,15 @@ do_sync_unlocked:
err = -EBUSY;
} else {
err = ceph_sync_setxattr(inode, name, value, size, flags);
if (err >= 0 && check_realm) {
/* check if snaprealm was created for quota inode */
spin_lock(&ci->i_ceph_lock);
if ((ci->i_max_files || ci->i_max_bytes) &&
!(ci->i_snap_realm &&
ci->i_snap_realm->ino == ci->i_vino.ino))
err = -EOPNOTSUPP;
spin_unlock(&ci->i_ceph_lock);
}
}
out:
ceph_free_cap_flush(prealloc_cf);