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authorLuis Henriques <lhenriques@suse.com>2018-01-05 10:47:20 +0000
committerIlya Dryomov <idryomov@gmail.com>2018-04-02 11:17:52 +0200
commitcafe21a4fb3075fb2980caba8fdb533a1bdb52b0 (patch)
treeccdcecba6b1fb66f93c95032fb2be668e10aa7fe /fs/ceph/quota.c
parentb7a2921765cf796280baf653a52b22b52e0ba266 (diff)
ceph: quota: don't allow cross-quota renames
This patch changes ceph_rename so that -EXDEV is returned if an attempt is made to mv a file between two different dir trees with different quotas setup. Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/quota.c')
-rw-r--r--fs/ceph/quota.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
index cf1c78c4a4d2..5d7dada91a57 100644
--- a/fs/ceph/quota.c
+++ b/fs/ceph/quota.c
@@ -21,6 +21,11 @@
#include "super.h"
#include "mds_client.h"
+static inline bool ceph_has_quota(struct ceph_inode_info *ci)
+{
+ return (ci && (ci->i_max_files || ci->i_max_bytes));
+}
+
void ceph_handle_quota(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_msg *msg)
@@ -64,6 +69,70 @@ void ceph_handle_quota(struct ceph_mds_client *mdsc,
iput(inode);
}
+/*
+ * This function walks through the snaprealm for an inode and returns the
+ * ceph_snap_realm for the first snaprealm that has quotas set (either max_files
+ * or max_bytes). If the root is reached, return the root ceph_snap_realm
+ * instead.
+ *
+ * Note that the caller is responsible for calling ceph_put_snap_realm() on the
+ * returned realm.
+ */
+static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
+ struct inode *inode)
+{
+ struct ceph_inode_info *ci = NULL;
+ struct ceph_snap_realm *realm, *next;
+ struct ceph_vino vino;
+ struct inode *in;
+
+ realm = ceph_inode(inode)->i_snap_realm;
+ ceph_get_snap_realm(mdsc, realm);
+ while (realm) {
+ vino.ino = realm->ino;
+ vino.snap = CEPH_NOSNAP;
+ in = ceph_find_inode(inode->i_sb, vino);
+ if (!in) {
+ pr_warn("Failed to find inode for %llu\n", vino.ino);
+ break;
+ }
+ ci = ceph_inode(in);
+ if (ceph_has_quota(ci) || (ci->i_vino.ino == CEPH_INO_ROOT)) {
+ iput(in);
+ return realm;
+ }
+ iput(in);
+ next = realm->parent;
+ ceph_get_snap_realm(mdsc, next);
+ ceph_put_snap_realm(mdsc, realm);
+ realm = next;
+ }
+ if (realm)
+ ceph_put_snap_realm(mdsc, realm);
+
+ return NULL;
+}
+
+bool ceph_quota_is_same_realm(struct inode *old, struct inode *new)
+{
+ struct ceph_mds_client *mdsc = ceph_inode_to_client(old)->mdsc;
+ struct ceph_snap_realm *old_realm, *new_realm;
+ bool is_same;
+
+ down_read(&mdsc->snap_rwsem);
+ old_realm = get_quota_realm(mdsc, old);
+ new_realm = get_quota_realm(mdsc, new);
+ is_same = (old_realm == new_realm);
+ up_read(&mdsc->snap_rwsem);
+
+ if (old_realm)
+ ceph_put_snap_realm(mdsc, old_realm);
+ if (new_realm)
+ ceph_put_snap_realm(mdsc, new_realm);
+
+ return is_same;
+}
+
enum quota_check_op {
QUOTA_CHECK_MAX_FILES_OP /* check quota max_files limit */
};