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Commit 7bc00fdd authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov
Browse files

ceph: kick cap flushes before sending other cap message 



If ceph_check_caps() wants to send cap message to a recovering MDS,
make sure it kicks cap flushes first.

Signed-off-by: default avatarYan, Zheng <zyan@redhat.com>
parent 70220ac8

fs/ceph/caps.c

+34 −9
Original line number Diff line number Diff line
@@ -41,6 +41,10 @@ 
 */



static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc);

static void __kick_flushing_caps(struct ceph_mds_client *mdsc,

				 struct ceph_mds_session *session,

				 struct ceph_inode_info *ci,

				 u64 oldest_flush_tid);



/*

 * Generate readable cap strings for debugging output.
@@ -1563,11 +1567,6 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags, 
	if (ci->i_ceph_flags & CEPH_I_FLUSH)

		flags |= CHECK_CAPS_FLUSH;



	/* flush snaps first time around only */

	if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {

		__ceph_flush_snaps(ci, &session);

		ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;

	}

	goto retry_locked;

retry:

	spin_lock(&ci->i_ceph_lock);
@@ -1688,11 +1687,16 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags, 
			}

		}

		/* flush anything dirty? */

		if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&

		    ci->i_dirty_caps) {

		if (cap == ci->i_auth_cap) {

			if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) {

				dout("flushing dirty caps\n");

				goto ack;

			}

			if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {

				dout("flushing snap caps\n");

				goto ack;

			}

		}



		/* completed revocation? going down and there are no caps? */

		if (revoking && (revoking & cap_used) == 0) {
@@ -1750,6 +1754,27 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags, 
				goto retry;

			}

		}



		/* kick flushing and flush snaps before sending normal

		 * cap message */

		if (cap == ci->i_auth_cap &&

		    (ci->i_ceph_flags &

		     (CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) {

			if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) {

				spin_lock(&mdsc->cap_dirty_lock);

				oldest_flush_tid = __get_oldest_flush_tid(mdsc);

				spin_unlock(&mdsc->cap_dirty_lock);

				__kick_flushing_caps(mdsc, session, ci,

						     oldest_flush_tid);

				ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;

			}

			if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) {

				__ceph_flush_snaps(ci, &session);

				ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS;

			}

			goto retry_locked;

		}



		/* take snap_rwsem after session mutex */

		if (!took_snap_rwsem) {

			if (down_read_trylock(&mdsc->snap_rwsem) == 0) {