Merge tag 'gfs2-v6.4-rc5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 updates from Andreas Gruenbacher:

 - Move the freeze/thaw logic from glock callback context to process /
   worker thread context to prevent deadlocks

 - Fix a quota reference couting bug in do_qc()

 - Carry on deallocating inodes even when gfs2_rindex_update() fails

 - Retry filesystem-internal reads when they are interruped by a signal

 - Eliminate kmap_atomic() in favor of kmap_local_page() /
   memcpy_{from,to}_page()

 - Get rid of noop_direct_IO

 - And a few more minor fixes and cleanups

* tag 'gfs2-v6.4-rc5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2: (23 commits)
  gfs2: Add quota_change type
  gfs2: Use memcpy_{from,to}_page where appropriate
  gfs2: Convert remaining kmap_atomic calls to kmap_local_page
  gfs2: Replace deprecated kmap_atomic with kmap_local_page
  gfs: Get rid of unnucessary locking in inode_go_dump
  gfs2: gfs2_freeze_lock_shared cleanup
  gfs2: Replace sd_freeze_state with SDF_FROZEN flag
  gfs2: Rework freeze / thaw logic
  gfs2: Rename SDF_{FS_FROZEN => FREEZE_INITIATOR}
  gfs2: Reconfiguring frozen filesystem already rejected
  gfs2: Rename gfs2_freeze_lock{ => _shared }
  gfs2: Rename the {freeze,thaw}_super callbacks
  gfs2: Rename remaining "transaction" glock references
  gfs2: retry interrupted internal reads
  gfs2: Fix possible data races in gfs2_show_options()
  gfs2: Fix duplicate should_fault_in_pages() call
  gfs2: set FMODE_CAN_ODIRECT instead of a dummy direct_IO method
  gfs2: Don't remember delete unless it's successful
  gfs2: Update rl_unlinked before releasing rgrp lock
  gfs2: Fix gfs2_qa_get imbalance in gfs2_quota_hold
  ...

fs/gfs2/aops.c

@@ -432,10 +432,10 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
 	if (error)
 		return error;
 
-	kaddr = kmap_atomic(page);
+	kaddr = kmap_local_page(page);
 	memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
 	memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
-	kunmap_atomic(kaddr);
+	kunmap_local(kaddr);
 	flush_dcache_page(page);
 	brelse(dibh);
 	SetPageUptodate(page);
@@ -489,18 +489,18 @@ int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
 	unsigned copied = 0;
 	unsigned amt;
 	struct page *page;
-	void *p;
 
 	do {
+		page = read_cache_page(mapping, index, gfs2_read_folio, NULL);
+		if (IS_ERR(page)) {
+			if (PTR_ERR(page) == -EINTR)
+				continue;
+			return PTR_ERR(page);
+		}
 		amt = size - copied;
 		if (offset + size > PAGE_SIZE)
 			amt = PAGE_SIZE - offset;
-		page = read_cache_page(mapping, index, gfs2_read_folio, NULL);
-		if (IS_ERR(page))
-			return PTR_ERR(page);
-		p = kmap_atomic(page);
-		memcpy(buf + copied, p + offset, amt);
-		kunmap_atomic(p);
+		memcpy_from_page(buf + copied, page, offset, amt);
 		put_page(page);
 		copied += amt;
 		index++;
@@ -751,7 +751,6 @@ static const struct address_space_operations gfs2_aops = {
 	.release_folio = iomap_release_folio,
 	.invalidate_folio = iomap_invalidate_folio,
 	.bmap = gfs2_bmap,
-	.direct_IO = noop_direct_IO,
 	.migrate_folio = filemap_migrate_folio,
 	.is_partially_uptodate = iomap_is_partially_uptodate,
 	.error_remove_page = generic_error_remove_page,

fs/gfs2/bmap.c

@@ -1729,8 +1729,8 @@ static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length)
 
 	if (offset >= maxsize) {
 		/*
-		 * The starting point lies beyond the allocated meta-data;
-		 * there are no blocks do deallocate.
+		 * The starting point lies beyond the allocated metadata;
+		 * there are no blocks to deallocate.
 		 */
 		return 0;
 	}

fs/gfs2/file.c

@@ -630,6 +630,9 @@ int gfs2_open_common(struct inode *inode, struct file *file)
 		ret = generic_file_open(inode, file);
 		if (ret)
 			return ret;
+
+		if (!gfs2_is_jdata(GFS2_I(inode)))
+			file->f_mode |= FMODE_CAN_ODIRECT;
 	}
 
 	fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
@@ -1030,8 +1033,8 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
 	}
 
 	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, gh);
-retry:
 	if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) {
+retry:
 		window_size -= fault_in_iov_iter_readable(from, window_size);
 		if (!window_size) {
 			ret = -EFAULT;

fs/gfs2/glock.c

@@ -145,8 +145,8 @@ static void gfs2_glock_dealloc(struct rcu_head *rcu)
  *
  * We need to allow some glocks to be enqueued, dequeued, promoted, and demoted
  * when we're withdrawn. For example, to maintain metadata integrity, we should
- * disallow the use of inode and rgrp glocks when withdrawn. Other glocks, like
- * iopen or the transaction glocks may be safely used because none of their
+ * disallow the use of inode and rgrp glocks when withdrawn. Other glocks like
+ * the iopen or freeze glock may be safely used because none of their
  * metadata goes through the journal. So in general, we should disallow all
  * glocks that are journaled, and allow all the others. One exception is:
  * we need to allow our active journal to be promoted and demoted so others

fs/gfs2/glops.c

@@ -236,7 +236,7 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
 	truncate_inode_pages_range(mapping, start, end);
 }
 
-static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
+static void gfs2_rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl,
 			      const char *fs_id_buf)
 {
 	struct gfs2_rgrpd *rgd = gl->gl_object;
@@ -536,72 +536,53 @@ static int inode_go_held(struct gfs2_holder *gh)
  *
  */
 
-static void inode_go_dump(struct seq_file *seq, struct gfs2_glock *gl,
+static void inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl,
 			  const char *fs_id_buf)
 {
 	struct gfs2_inode *ip = gl->gl_object;
-	struct inode *inode;
-	unsigned long nrpages;
+	const struct inode *inode = &ip->i_inode;
 
 	if (ip == NULL)
 		return;
 
-	inode = &ip->i_inode;
-	xa_lock_irq(&inode->i_data.i_pages);
-	nrpages = inode->i_data.nrpages;
-	xa_unlock_irq(&inode->i_data.i_pages);
-
 	gfs2_print_dbg(seq, "%s I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu "
 		       "p:%lu\n", fs_id_buf,
 		  (unsigned long long)ip->i_no_formal_ino,
 		  (unsigned long long)ip->i_no_addr,
-		  IF2DT(ip->i_inode.i_mode), ip->i_flags,
+		  IF2DT(inode->i_mode), ip->i_flags,
 		  (unsigned int)ip->i_diskflags,
-		  (unsigned long long)i_size_read(inode), nrpages);
+		  (unsigned long long)i_size_read(inode),
+		  inode->i_data.nrpages);
 }
 
 /**
- * freeze_go_sync - promote/demote the freeze glock
+ * freeze_go_callback - A cluster node is requesting a freeze
  * @gl: the glock
+ * @remote: true if this came from a different cluster node
  */
 
-static int freeze_go_sync(struct gfs2_glock *gl)
+static void freeze_go_callback(struct gfs2_glock *gl, bool remote)
 {
-	int error = 0;
 	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+	struct super_block *sb = sdp->sd_vfs;
+
+	if (!remote ||
+	    gl->gl_state != LM_ST_SHARED ||
+	    gl->gl_demote_state != LM_ST_UNLOCKED)
+		return;
 
 	/*
-	 * We need to check gl_state == LM_ST_SHARED here and not gl_req ==
-	 * LM_ST_EXCLUSIVE. That's because when any node does a freeze,
-	 * all the nodes should have the freeze glock in SH mode and they all
-	 * call do_xmote: One for EX and the others for UN. They ALL must
-	 * freeze locally, and they ALL must queue freeze work. The freeze_work
-	 * calls freeze_func, which tries to reacquire the freeze glock in SH,
-	 * effectively waiting for the thaw on the node who holds it in EX.
-	 * Once thawed, the work func acquires the freeze glock in
-	 * SH and everybody goes back to thawed.
+	 * Try to get an active super block reference to prevent racing with
+	 * unmount (see trylock_super()).  But note that unmount isn't the only
+	 * place where a write lock on s_umount is taken, and we can fail here
+	 * because of things like remount as well.
 	 */
-	if (gl->gl_state == LM_ST_SHARED && !gfs2_withdrawn(sdp) &&
-	    !test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
-		atomic_set(&sdp->sd_freeze_state, SFS_STARTING_FREEZE);
-		error = freeze_super(sdp->sd_vfs);
-		if (error) {
-			fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
-				error);
-			if (gfs2_withdrawn(sdp)) {
-				atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
-				return 0;
-			}
-			gfs2_assert_withdraw(sdp, 0);
-		}
-		queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work);
-		if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
-			gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
-				       GFS2_LFC_FREEZE_GO_SYNC);
-		else /* read-only mounts */
-			atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
+	if (down_read_trylock(&sb->s_umount)) {
+		atomic_inc(&sb->s_active);
+		up_read(&sb->s_umount);
+		if (!queue_work(gfs2_freeze_wq, &sdp->sd_freeze_work))
+			deactivate_super(sb);
 	}
-	return 0;
 }
 
 /**
@@ -761,9 +742,9 @@ const struct gfs2_glock_operations gfs2_rgrp_glops = {
 };
 
 const struct gfs2_glock_operations gfs2_freeze_glops = {
-	.go_sync = freeze_go_sync,
 	.go_xmote_bh = freeze_go_xmote_bh,
 	.go_demote_ok = freeze_go_demote_ok,
+	.go_callback = freeze_go_callback,
 	.go_type = LM_TYPE_NONDISK,
 	.go_flags = GLOF_NONDISK,
 };

fs/gfs2/incore.h

@@ -221,7 +221,7 @@ struct gfs2_glock_operations {
 	int (*go_demote_ok) (const struct gfs2_glock *gl);
 	int (*go_instantiate) (struct gfs2_glock *gl);
 	int (*go_held)(struct gfs2_holder *gh);
-	void (*go_dump)(struct seq_file *seq, struct gfs2_glock *gl,
+	void (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl,
 			const char *fs_id_buf);
 	void (*go_callback)(struct gfs2_glock *gl, bool remote);
 	void (*go_free)(struct gfs2_glock *gl);
@@ -600,7 +600,7 @@ enum {
 	SDF_RORECOVERY		= 7, /* read only recovery */
 	SDF_SKIP_DLM_UNLOCK	= 8,
 	SDF_FORCE_AIL_FLUSH     = 9,
-	SDF_FS_FROZEN           = 10,
+	SDF_FREEZE_INITIATOR	= 10,
 	SDF_WITHDRAWING		= 11, /* Will withdraw eventually */
 	SDF_WITHDRAW_IN_PROG	= 12, /* Withdraw is in progress */
 	SDF_REMOTE_WITHDRAW	= 13, /* Performing remote recovery */
@@ -608,12 +608,7 @@ enum {
 					 withdrawing */
 	SDF_DEACTIVATING	= 15,
 	SDF_EVICTING		= 16,
-};
-
-enum gfs2_freeze_state {
-	SFS_UNFROZEN		= 0,
-	SFS_STARTING_FREEZE	= 1,
-	SFS_FROZEN		= 2,
+	SDF_FROZEN		= 17,
 };
 
 #define GFS2_FSNAME_LEN		256
@@ -841,7 +836,6 @@ struct gfs2_sbd {
 
 	/* For quiescing the filesystem */
 	struct gfs2_holder sd_freeze_gh;
-	atomic_t sd_freeze_state;
 	struct mutex sd_freeze_mutex;
 
 	char sd_fsname[GFS2_FSNAME_LEN + 3 * sizeof(int) + 2];

fs/gfs2/lock_dlm.c

@@ -296,10 +296,8 @@ static void gdlm_put_lock(struct gfs2_glock *gl)
 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 	int error;
 
-	if (gl->gl_lksb.sb_lkid == 0) {
-		gfs2_glock_free(gl);
-		return;
-	}
+	if (gl->gl_lksb.sb_lkid == 0)
+		goto out_free;
 
 	clear_bit(GLF_BLOCKING, &gl->gl_flags);
 	gfs2_glstats_inc(gl, GFS2_LKS_DCOUNT);
@@ -307,17 +305,13 @@ static void gdlm_put_lock(struct gfs2_glock *gl)
 	gfs2_update_request_times(gl);
 
 	/* don't want to call dlm if we've unmounted the lock protocol */
-	if (test_bit(DFL_UNMOUNT, &ls->ls_recover_flags)) {
-		gfs2_glock_free(gl);
-		return;
-	}
+	if (test_bit(DFL_UNMOUNT, &ls->ls_recover_flags))
+		goto out_free;
 	/* don't want to skip dlm_unlock writing the lvb when lock has one */
 
 	if (test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags) &&
-	    !gl->gl_lksb.sb_lvbptr) {
-		gfs2_glock_free(gl);
-		return;
-	}
+	    !gl->gl_lksb.sb_lvbptr)
+		goto out_free;
 
 again:
 	error = dlm_unlock(ls->ls_dlm, gl->gl_lksb.sb_lkid, DLM_LKF_VALBLK,
@@ -331,8 +325,11 @@ static void gdlm_put_lock(struct gfs2_glock *gl)
 		fs_err(sdp, "gdlm_unlock %x,%llx err=%d\n",
 		       gl->gl_name.ln_type,
 		       (unsigned long long)gl->gl_name.ln_number, error);
-		return;
 	}
+	return;
+
+out_free:
+	gfs2_glock_free(gl);
 }
 
 static void gdlm_cancel(struct gfs2_glock *gl)

fs/gfs2/log.c

@@ -914,9 +914,8 @@ void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
 static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
 {
 	blk_opf_t op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC;
-	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 
-	gfs2_assert_withdraw(sdp, (state != SFS_FROZEN));
+	gfs2_assert_withdraw(sdp, !test_bit(SDF_FROZEN, &sdp->sd_flags));
 
 	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
 		gfs2_ordered_wait(sdp);
@@ -1036,7 +1035,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
 {
 	struct gfs2_trans *tr = NULL;
 	unsigned int reserved_blocks = 0, used_blocks = 0;
-	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
+	bool frozen = test_bit(SDF_FROZEN, &sdp->sd_flags);
 	unsigned int first_log_head;
 	unsigned int reserved_revokes = 0;
 
@@ -1067,7 +1066,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
 		if (tr) {
 			sdp->sd_log_tr = NULL;
 			tr->tr_first = first_log_head;
-			if (unlikely (state == SFS_FROZEN)) {
+			if (unlikely(frozen)) {
 				if (gfs2_assert_withdraw_delayed(sdp,
 				       !tr->tr_num_buf_new && !tr->tr_num_databuf_new))
 					goto out_withdraw;
@@ -1092,7 +1091,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
 	if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN)
 		clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 
-	if (unlikely(state == SFS_FROZEN))
+	if (unlikely(frozen))
 		if (gfs2_assert_withdraw_delayed(sdp, !reserved_revokes))
 			goto out_withdraw;
 
@@ -1136,8 +1135,6 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
 		if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
 			     GFS2_LOG_HEAD_FLUSH_FREEZE))
 			gfs2_log_shutdown(sdp);
-		if (flags & GFS2_LOG_HEAD_FLUSH_FREEZE)
-			atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
 	}
 
 out_end:

fs/gfs2/lops.c

@@ -427,10 +427,11 @@ static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd,
 {
 	struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 	struct gfs2_log_header_host lh;
-	void *kaddr = kmap_atomic(page);
+	void *kaddr;
 	unsigned int offset;
 	bool ret = false;
 
+	kaddr = kmap_local_page(page);
 	for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) {
 		if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) {
 			if (lh.lh_sequence >= head->lh_sequence)
@@ -441,7 +442,7 @@ static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd,
 			}
 		}
 	}
-	kunmap_atomic(kaddr);
+	kunmap_local(kaddr);
 	return ret;
 }
 
@@ -626,11 +627,11 @@ static void gfs2_check_magic(struct buffer_head *bh)
 	__be32 *ptr;
 
 	clear_buffer_escaped(bh);
-	kaddr = kmap_atomic(bh->b_page);
+	kaddr = kmap_local_page(bh->b_page);
 	ptr = kaddr + bh_offset(bh);
 	if (*ptr == cpu_to_be32(GFS2_MAGIC))
 		set_buffer_escaped(bh);
-	kunmap_atomic(kaddr);
+	kunmap_local(kaddr);
 }
 
 static int blocknr_cmp(void *priv, const struct list_head *a,
@@ -696,14 +697,12 @@ static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
 			lock_buffer(bd2->bd_bh);
 
 			if (buffer_escaped(bd2->bd_bh)) {
-				void *kaddr;
+				void *p;
+
 				page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
-				ptr = page_address(page);
-				kaddr = kmap_atomic(bd2->bd_bh->b_page);
-				memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
-				       bd2->bd_bh->b_size);
-				kunmap_atomic(kaddr);
-				*(__be32 *)ptr = 0;
+				p = page_address(page);
+				memcpy_from_page(p, page, bh_offset(bd2->bd_bh), bd2->bd_bh->b_size);
+				*(__be32 *)p = 0;
 				clear_buffer_escaped(bd2->bd_bh);
 				unlock_buffer(bd2->bd_bh);
 				brelse(bd2->bd_bh);

fs/gfs2/ops_fstype.c

@@ -135,7 +135,6 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
 	init_rwsem(&sdp->sd_log_flush_lock);
 	atomic_set(&sdp->sd_log_in_flight, 0);
 	init_waitqueue_head(&sdp->sd_log_flush_wait);
-	atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 	mutex_init(&sdp->sd_freeze_mutex);
 
 	return sdp;
@@ -434,7 +433,7 @@ static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 	error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
 			       CREATE, &sdp->sd_freeze_gl);
 	if (error) {
-		fs_err(sdp, "can't create transaction glock: %d\n", error);
+		fs_err(sdp, "can't create freeze glock: %d\n", error);
 		goto fail_rename;
 	}
 
@@ -1140,7 +1139,6 @@ static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
 	int silent = fc->sb_flags & SB_SILENT;
 	struct gfs2_sbd *sdp;
 	struct gfs2_holder mount_gh;
-	struct gfs2_holder freeze_gh;
 	int error;
 
 	sdp = init_sbd(sb);
@@ -1269,15 +1267,15 @@ static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
 		}
 	}
 
-	error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
+	error = gfs2_freeze_lock_shared(sdp);
 	if (error)
 		goto fail_per_node;
 
 	if (!sb_rdonly(sb))
 		error = gfs2_make_fs_rw(sdp);
 
-	gfs2_freeze_unlock(&freeze_gh);
 	if (error) {
+		gfs2_freeze_unlock(&sdp->sd_freeze_gh);
 		if (sdp->sd_quotad_process)
 			kthread_stop(sdp->sd_quotad_process);
 		sdp->sd_quotad_process = NULL;
@@ -1590,12 +1588,6 @@ static int gfs2_reconfigure(struct fs_context *fc)
 		fc->sb_flags |= SB_RDONLY;
 
 	if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
-		struct gfs2_holder freeze_gh;
-
-		error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
-		if (error)
-			return -EINVAL;
-
 		if (fc->sb_flags & SB_RDONLY) {
 			gfs2_make_fs_ro(sdp);
 		} else {
@@ -1603,7 +1595,6 @@ static int gfs2_reconfigure(struct fs_context *fc)
 			if (error)
 				errorfc(fc, "unable to remount read-write");
 		}
-		gfs2_freeze_unlock(&freeze_gh);
 	}
 	sdp->sd_args = *newargs;
 

fs/gfs2/quota.c

@@ -75,6 +75,9 @@
 #define GFS2_QD_HASH_SIZE       BIT(GFS2_QD_HASH_SHIFT)
 #define GFS2_QD_HASH_MASK       (GFS2_QD_HASH_SIZE - 1)
 
+#define QC_CHANGE 0
+#define QC_SYNC 1
+
 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
 /*                     -> sd_bitmap_lock                              */
 static DEFINE_SPINLOCK(qd_lock);
@@ -470,7 +473,6 @@ static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
 	spin_unlock(&qd_lock);
 
 	if (qd) {
-		gfs2_assert_warn(sdp, qd->qd_change_sync);
 		error = bh_get(qd);
 		if (error) {
 			clear_bit(QDF_LOCKED, &qd->qd_flags);
@@ -591,6 +593,7 @@ int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 	if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
 	    gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
 		error = -EIO;
+		gfs2_qa_put(ip);
 		goto out;
 	}
 
@@ -661,7 +664,7 @@ static int sort_qd(const void *a, const void *b)
 	return 0;
 }
 
-static void do_qc(struct gfs2_quota_data *qd, s64 change)
+static void do_qc(struct gfs2_quota_data *qd, s64 change, int qc_type)
 {
 	struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
 	struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
@@ -686,16 +689,18 @@ static void do_qc(struct gfs2_quota_data *qd, s64 change)
 	qd->qd_change = x;
 	spin_unlock(&qd_lock);
 
-	if (!x) {
+	if (qc_type == QC_CHANGE) {
+		if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
+			qd_hold(qd);
+			slot_hold(qd);
+		}
+	} else {
 		gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
 		clear_bit(QDF_CHANGE, &qd->qd_flags);
 		qc->qc_flags = 0;
 		qc->qc_id = 0;
 		slot_put(qd);
 		qd_put(qd);
-	} else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
-		qd_hold(qd);
-		slot_hold(qd);
 	}
 
 	if (change < 0) /* Reset quiet flag if we freed some blocks */
@@ -711,7 +716,6 @@ static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
 	struct address_space *mapping = inode->i_mapping;
 	struct page *page;
 	struct buffer_head *bh;
-	void *kaddr;
 	u64 blk;
 	unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
 	unsigned to_write = bytes, pg_off = off;
@@ -763,10 +767,8 @@ static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
 	}
 
 	/* Write to the page, now that we have setup the buffer(s) */
-	kaddr = kmap_atomic(page);
-	memcpy(kaddr + off, buf, bytes);
+	memcpy_to_page(page, off, buf, bytes);
 	flush_dcache_page(page);
-	kunmap_atomic(kaddr);
 	unlock_page(page);
 	put_page(page);
 
@@ -955,7 +957,7 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 		if (error)
 			goto out_end_trans;
 
-		do_qc(qd, -qd->qd_change_sync);
+		do_qc(qd, -qd->qd_change_sync, QC_SYNC);
 		set_bit(QDF_REFRESH, &qd->qd_flags);
 	}
 
@@ -1281,7 +1283,7 @@ void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
 
 		if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
 		    qid_eq(qd->qd_id, make_kqid_gid(gid))) {
-			do_qc(qd, change);
+			do_qc(qd, change, QC_CHANGE);
 		}
 	}
 }

fs/gfs2/recovery.c

@@ -404,7 +404,7 @@ void gfs2_recover_func(struct work_struct *work)
 	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 	struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 	struct gfs2_log_header_host head;
-	struct gfs2_holder j_gh, ji_gh, thaw_gh;
+	struct gfs2_holder j_gh, ji_gh;
 	ktime_t t_start, t_jlck, t_jhd, t_tlck, t_rep;
 	int ro = 0;
 	unsigned int pass;
@@ -420,10 +420,10 @@ void gfs2_recover_func(struct work_struct *work)
 	if (sdp->sd_args.ar_spectator)
 		goto fail;
 	if (jd->jd_jid != sdp->sd_lockstruct.ls_jid) {
-		fs_info(sdp, "jid=%u: Trying to acquire journal lock...\n",
+		fs_info(sdp, "jid=%u: Trying to acquire journal glock...\n",
 			jd->jd_jid);
 		jlocked = 1;
-		/* Acquire the journal lock so we can do recovery */
+		/* Acquire the journal glock so we can do recovery */
 
 		error = gfs2_glock_nq_num(sdp, jd->jd_jid, &gfs2_journal_glops,
 					  LM_ST_EXCLUSIVE,
@@ -465,14 +465,14 @@ void gfs2_recover_func(struct work_struct *work)
 		ktime_ms_delta(t_jhd, t_jlck));
 
 	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
-		fs_info(sdp, "jid=%u: Acquiring the transaction lock...\n",
-			jd->jd_jid);
-
-		/* Acquire a shared hold on the freeze lock */
+		mutex_lock(&sdp->sd_freeze_mutex);
 
-		error = gfs2_freeze_lock(sdp, &thaw_gh, LM_FLAG_PRIORITY);
-		if (error)
+		if (test_bit(SDF_FROZEN, &sdp->sd_flags)) {
+			mutex_unlock(&sdp->sd_freeze_mutex);
+			fs_warn(sdp, "jid=%u: Can't replay: filesystem "
+				"is frozen\n", jd->jd_jid);
 			goto fail_gunlock_ji;
+		}
 
 		if (test_bit(SDF_RORECOVERY, &sdp->sd_flags)) {
 			ro = 1;
@@ -496,7 +496,7 @@ void gfs2_recover_func(struct work_struct *work)
 			fs_warn(sdp, "jid=%u: Can't replay: read-only block "
 				"device\n", jd->jd_jid);
 			error = -EROFS;
-			goto fail_gunlock_thaw;
+			goto fail_gunlock_nofreeze;
 		}
 
 		t_tlck = ktime_get();
@@ -514,7 +514,7 @@ void gfs2_recover_func(struct work_struct *work)
 			lops_after_scan(jd, error, pass);
 			if (error) {
 				up_read(&sdp->sd_log_flush_lock);
-				goto fail_gunlock_thaw;
+				goto fail_gunlock_nofreeze;
 			}
 		}
 
@@ -522,7 +522,7 @@ void gfs2_recover_func(struct work_struct *work)
 		clean_journal(jd, &head);
 		up_read(&sdp->sd_log_flush_lock);
 
-		gfs2_freeze_unlock(&thaw_gh);
+		mutex_unlock(&sdp->sd_freeze_mutex);
 		t_rep = ktime_get();
 		fs_info(sdp, "jid=%u: Journal replayed in %lldms [jlck:%lldms, "
 			"jhead:%lldms, tlck:%lldms, replay:%lldms]\n",
@@ -543,8 +543,8 @@ void gfs2_recover_func(struct work_struct *work)
 	fs_info(sdp, "jid=%u: Done\n", jd->jd_jid);
 	goto done;
 
-fail_gunlock_thaw:
-	gfs2_freeze_unlock(&thaw_gh);
+fail_gunlock_nofreeze:
+	mutex_unlock(&sdp->sd_freeze_mutex);
 fail_gunlock_ji:
 	if (jlocked) {
 		gfs2_glock_dq_uninit(&ji_gh);

fs/gfs2/rgrp.c

@@ -2584,8 +2584,8 @@ void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
 
 	gfs2_trans_add_meta(rgd->rd_gl, rgd->rd_bits[0].bi_bh);
 	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
-	rgrp_unlock_local(rgd);
 	be32_add_cpu(&rgd->rd_rgl->rl_unlinked, -1);
+	rgrp_unlock_local(rgd);
 
 	gfs2_statfs_change(sdp, 0, +1, -1);
 	trace_gfs2_block_alloc(ip, rgd, ip->i_no_addr, 1, GFS2_BLKST_FREE);

fs/gfs2/super.c

@@ -332,7 +332,12 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
 	struct lfcc *lfcc;
 	LIST_HEAD(list);
 	struct gfs2_log_header_host lh;
-	int error;
+	int error, error2;
+
+	/*
+	 * Grab all the journal glocks in SH mode.  We are *probably* doing
+	 * that to prevent recovery.
+	 */
 
 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 		lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
@@ -349,11 +354,13 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
 		list_add(&lfcc->list, &list);
 	}
 
+	gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+
 	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 				   LM_FLAG_NOEXP | GL_NOPID,
 				   &sdp->sd_freeze_gh);
 	if (error)
-		goto out;
+		goto relock_shared;
 
 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 		error = gfs2_jdesc_check(jd);
@@ -368,8 +375,14 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
 		}
 	}
 
-	if (error)
-		gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+	if (!error)
+		goto out;  /* success */
+
+	gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+
+relock_shared:
+	error2 = gfs2_freeze_lock_shared(sdp);
+	gfs2_assert_withdraw(sdp, !error2);
 
 out:
 	while (!list_empty(&list)) {
@@ -463,7 +476,7 @@ static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
  * @flags: The type of dirty
  *
  * Unfortunately it can be called under any combination of inode
- * glock and transaction lock, so we have to check carefully.
+ * glock and freeze glock, so we have to check carefully.
  *
  * At the moment this deals only with atime - it should be possible
  * to expand that role in future, once a review of the locking has
@@ -615,6 +628,8 @@ static void gfs2_put_super(struct super_block *sb)
 
 	/*  Release stuff  */
 
+	gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+
 	iput(sdp->sd_jindex);
 	iput(sdp->sd_statfs_inode);
 	iput(sdp->sd_rindex);
@@ -669,59 +684,109 @@ static int gfs2_sync_fs(struct super_block *sb, int wait)
 	return sdp->sd_log_error;
 }
 
-void gfs2_freeze_func(struct work_struct *work)
+static int gfs2_freeze_locally(struct gfs2_sbd *sdp)
 {
-	int error;
-	struct gfs2_holder freeze_gh;
-	struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 	struct super_block *sb = sdp->sd_vfs;
+	int error;
 
-	atomic_inc(&sb->s_active);
-	error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
-	if (error) {
-		gfs2_assert_withdraw(sdp, 0);
-	} else {
-		atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
-		error = thaw_super(sb);
-		if (error) {
-			fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
-				error);
-			gfs2_assert_withdraw(sdp, 0);
+	error = freeze_super(sb);
+	if (error)
+		return error;
+
+	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+		gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_FREEZE |
+			       GFS2_LFC_FREEZE_GO_SYNC);
+		if (gfs2_withdrawn(sdp)) {
+			thaw_super(sb);
+			return -EIO;
 		}
-		gfs2_freeze_unlock(&freeze_gh);
 	}
+	return 0;
+}
+
+static int gfs2_do_thaw(struct gfs2_sbd *sdp)
+{
+	struct super_block *sb = sdp->sd_vfs;
+	int error;
+
+	error = gfs2_freeze_lock_shared(sdp);
+	if (error)
+		goto fail;
+	error = thaw_super(sb);
+	if (!error)
+		return 0;
+
+fail:
+	fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", error);
+	gfs2_assert_withdraw(sdp, 0);
+	return error;
+}
+
+void gfs2_freeze_func(struct work_struct *work)
+{
+	struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
+	struct super_block *sb = sdp->sd_vfs;
+	int error;
+
+	mutex_lock(&sdp->sd_freeze_mutex);
+	error = -EBUSY;
+	if (test_bit(SDF_FROZEN, &sdp->sd_flags))
+		goto freeze_failed;
+
+	error = gfs2_freeze_locally(sdp);
+	if (error)
+		goto freeze_failed;
+
+	gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+	set_bit(SDF_FROZEN, &sdp->sd_flags);
+
+	error = gfs2_do_thaw(sdp);
+	if (error)
+		goto out;
+
+	clear_bit(SDF_FROZEN, &sdp->sd_flags);
+	goto out;
+
+freeze_failed:
+	fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n", error);
+
+out:
+	mutex_unlock(&sdp->sd_freeze_mutex);
 	deactivate_super(sb);
-	clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
-	wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
-	return;
 }
 
 /**
- * gfs2_freeze - prevent further writes to the filesystem
+ * gfs2_freeze_super - prevent further writes to the filesystem
  * @sb: the VFS structure for the filesystem
  *
  */
 
-static int gfs2_freeze(struct super_block *sb)
+static int gfs2_freeze_super(struct super_block *sb)
 {
 	struct gfs2_sbd *sdp = sb->s_fs_info;
 	int error;
 
-	mutex_lock(&sdp->sd_freeze_mutex);
-	if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) {
-		error = -EBUSY;
+	if (!mutex_trylock(&sdp->sd_freeze_mutex))
+		return -EBUSY;
+	error = -EBUSY;
+	if (test_bit(SDF_FROZEN, &sdp->sd_flags))
 		goto out;
-	}
 
 	for (;;) {
-		if (gfs2_withdrawn(sdp)) {
-			error = -EINVAL;
+		error = gfs2_freeze_locally(sdp);
+		if (error) {
+			fs_info(sdp, "GFS2: couldn't freeze filesystem: %d\n",
+				error);
 			goto out;
 		}
 
 		error = gfs2_lock_fs_check_clean(sdp);
 		if (!error)
-			break;
+			break;  /* success */
+
+		error = gfs2_do_thaw(sdp);
+		if (error)
+			goto out;
 
 		if (error == -EBUSY)
 			fs_err(sdp, "waiting for recovery before freeze\n");
@@ -735,32 +800,58 @@ static int gfs2_freeze(struct super_block *sb)
 		fs_err(sdp, "retrying...\n");
 		msleep(1000);
 	}
-	set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
+
 out:
+	if (!error) {
+		set_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags);
+		set_bit(SDF_FROZEN, &sdp->sd_flags);
+	}
 	mutex_unlock(&sdp->sd_freeze_mutex);
 	return error;
 }
 
 /**
- * gfs2_unfreeze - reallow writes to the filesystem
+ * gfs2_thaw_super - reallow writes to the filesystem
  * @sb: the VFS structure for the filesystem
  *
  */
 
-static int gfs2_unfreeze(struct super_block *sb)
+static int gfs2_thaw_super(struct super_block *sb)
 {
 	struct gfs2_sbd *sdp = sb->s_fs_info;
+	int error;
 
-	mutex_lock(&sdp->sd_freeze_mutex);
-	if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
-	    !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
-		mutex_unlock(&sdp->sd_freeze_mutex);
-		return -EINVAL;
+	if (!mutex_trylock(&sdp->sd_freeze_mutex))
+		return -EBUSY;
+	error = -EINVAL;
+	if (!test_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags))
+		goto out;
+
+	gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+
+	error = gfs2_do_thaw(sdp);
+
+	if (!error) {
+		clear_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags);
+		clear_bit(SDF_FROZEN, &sdp->sd_flags);
 	}
+out:
+	mutex_unlock(&sdp->sd_freeze_mutex);
+	return error;
+}
+
+void gfs2_thaw_freeze_initiator(struct super_block *sb)
+{
+	struct gfs2_sbd *sdp = sb->s_fs_info;
+
+	mutex_lock(&sdp->sd_freeze_mutex);
+	if (!test_bit(SDF_FREEZE_INITIATOR, &sdp->sd_flags))
+		goto out;
 
 	gfs2_freeze_unlock(&sdp->sd_freeze_gh);
+
+out:
 	mutex_unlock(&sdp->sd_freeze_mutex);
-	return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
 }
 
 /**
@@ -1004,7 +1095,14 @@ static int gfs2_show_options(struct seq_file *s, struct dentry *root)
 {
 	struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
 	struct gfs2_args *args = &sdp->sd_args;
-	int val;
+	unsigned int logd_secs, statfs_slow, statfs_quantum, quota_quantum;
+
+	spin_lock(&sdp->sd_tune.gt_spin);
+	logd_secs = sdp->sd_tune.gt_logd_secs;
+	quota_quantum = sdp->sd_tune.gt_quota_quantum;
+	statfs_quantum = sdp->sd_tune.gt_statfs_quantum;
+	statfs_slow = sdp->sd_tune.gt_statfs_slow;
+	spin_unlock(&sdp->sd_tune.gt_spin);
 
 	if (is_ancestor(root, sdp->sd_master_dir))
 		seq_puts(s, ",meta");
@@ -1059,17 +1157,14 @@ static int gfs2_show_options(struct seq_file *s, struct dentry *root)
 	}
 	if (args->ar_discard)
 		seq_puts(s, ",discard");
-	val = sdp->sd_tune.gt_logd_secs;
-	if (val != 30)
-		seq_printf(s, ",commit=%d", val);
-	val = sdp->sd_tune.gt_statfs_quantum;
-	if (val != 30)
-		seq_printf(s, ",statfs_quantum=%d", val);
-	else if (sdp->sd_tune.gt_statfs_slow)
+	if (logd_secs != 30)
+		seq_printf(s, ",commit=%d", logd_secs);
+	if (statfs_quantum != 30)
+		seq_printf(s, ",statfs_quantum=%d", statfs_quantum);
+	else if (statfs_slow)
 		seq_puts(s, ",statfs_quantum=0");
-	val = sdp->sd_tune.gt_quota_quantum;
-	if (val != 60)
-		seq_printf(s, ",quota_quantum=%d", val);
+	if (quota_quantum != 60)
+		seq_printf(s, ",quota_quantum=%d", quota_quantum);
 	if (args->ar_statfs_percent)
 		seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
 	if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
@@ -1131,9 +1226,7 @@ static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
 		return -EIO;
 	}
 
-	error = gfs2_rindex_update(sdp);
-	if (error)
-		return error;
+	gfs2_rindex_update(sdp);
 
 	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 	if (error)
@@ -1334,9 +1427,6 @@ static int evict_unlinked_inode(struct inode *inode)
 			goto out;
 	}
 
-	if (ip->i_gl)
-		gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
-
 	/*
 	 * As soon as we clear the bitmap for the dinode, gfs2_create_inode()
 	 * can get called to recreate it, or even gfs2_inode_lookup() if the
@@ -1350,6 +1440,9 @@ static int evict_unlinked_inode(struct inode *inode)
 	 */
 
 	ret = gfs2_dinode_dealloc(ip);
+	if (!ret && ip->i_gl)
+		gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
+
 out:
 	return ret;
 }
@@ -1528,8 +1621,8 @@ const struct super_operations gfs2_super_ops = {
 	.evict_inode		= gfs2_evict_inode,
 	.put_super		= gfs2_put_super,
 	.sync_fs		= gfs2_sync_fs,
-	.freeze_super		= gfs2_freeze,
-	.thaw_super		= gfs2_unfreeze,
+	.freeze_super		= gfs2_freeze_super,
+	.thaw_super		= gfs2_thaw_super,
 	.statfs			= gfs2_statfs,
 	.drop_inode		= gfs2_drop_inode,
 	.show_options		= gfs2_show_options,

fs/gfs2/super.h

@@ -46,6 +46,7 @@ extern void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc,
 extern void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh);
 extern int gfs2_statfs_sync(struct super_block *sb, int type);
 extern void gfs2_freeze_func(struct work_struct *work);
+extern void gfs2_thaw_freeze_initiator(struct super_block *sb);
 
 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp);
 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,

fs/gfs2/sys.c

@@ -82,6 +82,7 @@ static ssize_t status_show(struct gfs2_sbd *sdp, char *buf)
 		     "RO Recovery:              %d\n"
 		     "Skip DLM Unlock:          %d\n"
 		     "Force AIL Flush:          %d\n"
+		     "FS Freeze Initiator:      %d\n"
 		     "FS Frozen:                %d\n"
 		     "Withdrawing:              %d\n"
 		     "Withdraw In Prog:         %d\n"
@@ -111,7 +112,8 @@ static ssize_t status_show(struct gfs2_sbd *sdp, char *buf)
 		     test_bit(SDF_RORECOVERY, &f),
 		     test_bit(SDF_SKIP_DLM_UNLOCK, &f),
 		     test_bit(SDF_FORCE_AIL_FLUSH, &f),
-		     test_bit(SDF_FS_FROZEN, &f),
+		     test_bit(SDF_FREEZE_INITIATOR, &f),
+		     test_bit(SDF_FROZEN, &f),
 		     test_bit(SDF_WITHDRAWING, &f),
 		     test_bit(SDF_WITHDRAW_IN_PROG, &f),
 		     test_bit(SDF_REMOTE_WITHDRAW, &f),

fs/gfs2/trans.c

@@ -233,7 +233,6 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 	struct gfs2_bufdata *bd;
 	struct gfs2_meta_header *mh;
 	struct gfs2_trans *tr = current->journal_info;
-	enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 
 	lock_buffer(bh);
 	if (buffer_pinned(bh)) {
@@ -267,7 +266,7 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 		       (unsigned long long)bd->bd_bh->b_blocknr);
 		BUG();
 	}
-	if (unlikely(state == SFS_FROZEN)) {
+	if (unlikely(test_bit(SDF_FROZEN, &sdp->sd_flags))) {
 		fs_info(sdp, "GFS2:adding buf while frozen\n");
 		gfs2_assert_withdraw(sdp, 0);
 	}

fs/gfs2/util.c

@@ -93,21 +93,18 @@ int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
 }
 
 /**
- * gfs2_freeze_lock - hold the freeze glock
+ * gfs2_freeze_lock_shared - hold the freeze glock
  * @sdp: the superblock
- * @freeze_gh: pointer to the requested holder
- * @caller_flags: any additional flags needed by the caller
  */
-int gfs2_freeze_lock(struct gfs2_sbd *sdp, struct gfs2_holder *freeze_gh,
-		     int caller_flags)
+int gfs2_freeze_lock_shared(struct gfs2_sbd *sdp)
 {
-	int flags = LM_FLAG_NOEXP | GL_EXACT | caller_flags;
 	int error;
 
-	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, flags,
-				   freeze_gh);
-	if (error && error != GLR_TRYFAILED)
-		fs_err(sdp, "can't lock the freeze lock: %d\n", error);
+	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
+				   LM_FLAG_NOEXP | GL_EXACT,
+				   &sdp->sd_freeze_gh);
+	if (error)
+		fs_err(sdp, "can't lock the freeze glock: %d\n", error);
 	return error;
 }
 
@@ -124,7 +121,6 @@ static void signal_our_withdraw(struct gfs2_sbd *sdp)
 	struct gfs2_inode *ip;
 	struct gfs2_glock *i_gl;
 	u64 no_formal_ino;
-	int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 	int ret = 0;
 	int tries;
 
@@ -152,24 +148,18 @@ static void signal_our_withdraw(struct gfs2_sbd *sdp)
 	 */
 	clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 	if (!sb_rdonly(sdp->sd_vfs)) {
-		struct gfs2_holder freeze_gh;
-
-		gfs2_holder_mark_uninitialized(&freeze_gh);
-		if (sdp->sd_freeze_gl &&
-		    !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
-			ret = gfs2_freeze_lock(sdp, &freeze_gh,
-				       log_write_allowed ? 0 : LM_FLAG_TRY);
-			if (ret == GLR_TRYFAILED)
-				ret = 0;
-		}
-		if (!ret)
-			gfs2_make_fs_ro(sdp);
+		bool locked = mutex_trylock(&sdp->sd_freeze_mutex);
+
+		gfs2_make_fs_ro(sdp);
+
+		if (locked)
+			mutex_unlock(&sdp->sd_freeze_mutex);
+
 		/*
 		 * Dequeue any pending non-system glock holders that can no
 		 * longer be granted because the file system is withdrawn.
 		 */
 		gfs2_gl_dq_holders(sdp);
-		gfs2_freeze_unlock(&freeze_gh);
 	}
 
 	if (sdp->sd_lockstruct.ls_ops->lm_lock == NULL) { /* lock_nolock */
@@ -187,15 +177,8 @@ static void signal_our_withdraw(struct gfs2_sbd *sdp)
 	}
 	sdp->sd_jinode_gh.gh_flags |= GL_NOCACHE;
 	gfs2_glock_dq(&sdp->sd_jinode_gh);
-	if (test_bit(SDF_FS_FROZEN, &sdp->sd_flags)) {
-		/* Make sure gfs2_unfreeze works if partially-frozen */
-		flush_work(&sdp->sd_freeze_work);
-		atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
-		thaw_super(sdp->sd_vfs);
-	} else {
-		wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE,
-			    TASK_UNINTERRUPTIBLE);
-	}
+	gfs2_thaw_freeze_initiator(sdp->sd_vfs);
+	wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE);
 
 	/*
 	 * holder_uninit to force glock_put, to force dlm to let go

fs/gfs2/util.h

@@ -149,8 +149,7 @@ int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function,
 
 extern int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
 			       bool verbose);
-extern int gfs2_freeze_lock(struct gfs2_sbd *sdp,
-			    struct gfs2_holder *freeze_gh, int caller_flags);
+extern int gfs2_freeze_lock_shared(struct gfs2_sbd *sdp);
 extern void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh);
 
 #define gfs2_io_error(sdp) \