Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 710 insertions, 0 deletions

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
new file mode 100644
index 000000000..28f32424e
--- /dev/null
+++ b/fs/gfs2/glops.c
@@ -0,0 +1,710 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/bio.h>
+#include <linux/posix_acl.h>
+#include <linux/security.h>
+#include <linux/log2.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "bmap.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "recovery.h"
+#include "rgrp.h"
+#include "util.h"
+#include "trans.h"
+#include "dir.h"
+#include "lops.h"
+
+struct workqueue_struct *gfs2_freeze_wq;
+
+static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+
+	fs_err(sdp,
+	       "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page "
+	       "state 0x%lx\n",
+	       bh, (unsigned long long)bh->b_blocknr, bh->b_state,
+	       bh->b_folio->mapping, bh->b_folio->flags.f);
+	fs_err(sdp, "AIL glock %u:%llu mapping %p\n",
+	       glock_type(gl), glock_number(gl),
+	       gfs2_glock2aspace(gl));
+	gfs2_lm(sdp, "AIL error\n");
+	gfs2_withdraw(sdp);
+}
+
+/**
+ * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
+ * @gl: the glock
+ * @fsync: set when called from fsync (not all buffers will be clean)
+ * @nr_revokes: Number of buffers to revoke
+ *
+ * None of the buffers should be dirty, locked, or pinned.
+ */
+
+static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
+			     unsigned int nr_revokes)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct list_head *head = &gl->gl_ail_list;
+	struct gfs2_bufdata *bd, *tmp;
+	struct buffer_head *bh;
+	const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
+
+	spin_lock(&sdp->sd_log_lock);
+	spin_lock(&sdp->sd_ail_lock);
+	list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
+		if (nr_revokes == 0)
+			break;
+		bh = bd->bd_bh;
+		if (bh->b_state & b_state) {
+			if (fsync)
+				continue;
+			gfs2_ail_error(gl, bh);
+		}
+		gfs2_trans_add_revoke(sdp, bd);
+		nr_revokes--;
+	}
+	GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
+	spin_unlock(&sdp->sd_ail_lock);
+	spin_unlock(&sdp->sd_log_lock);
+}
+
+
+static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct gfs2_trans tr;
+	unsigned int revokes;
+	int ret = 0;
+
+	revokes = atomic_read(&gl->gl_ail_count);
+
+	if (!revokes) {
+		bool have_revokes;
+		bool log_in_flight;
+
+		/*
+		 * We have nothing on the ail, but there could be revokes on
+		 * the sdp revoke queue, in which case, we still want to flush
+		 * the log and wait for it to finish.
+		 *
+		 * If the sdp revoke list is empty too, we might still have an
+		 * io outstanding for writing revokes, so we should wait for
+		 * it before returning.
+		 *
+		 * If none of these conditions are true, our revokes are all
+		 * flushed and we can return.
+		 */
+		spin_lock(&sdp->sd_log_lock);
+		have_revokes = !list_empty(&sdp->sd_log_revokes);
+		log_in_flight = atomic_read(&sdp->sd_log_in_flight);
+		spin_unlock(&sdp->sd_log_lock);
+		if (have_revokes)
+			goto flush;
+		if (log_in_flight)
+			log_flush_wait(sdp);
+		return 0;
+	}
+
+	memset(&tr, 0, sizeof(tr));
+	set_bit(TR_ONSTACK, &tr.tr_flags);
+	ret = __gfs2_trans_begin(&tr, sdp, 0, revokes, _RET_IP_);
+	if (ret) {
+		fs_err(sdp, "Transaction error %d: Unable to write revokes.", ret);
+		goto flush;
+	}
+	__gfs2_ail_flush(gl, 0, revokes);
+	gfs2_trans_end(sdp);
+
+flush:
+	if (!ret)
+		gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
+				GFS2_LFC_AIL_EMPTY_GL);
+	return ret;
+}
+
+void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	unsigned int revokes = atomic_read(&gl->gl_ail_count);
+	int ret;
+
+	if (!revokes)
+		return;
+
+	ret = gfs2_trans_begin(sdp, 0, revokes);
+	if (ret)
+		return;
+	__gfs2_ail_flush(gl, fsync, revokes);
+	gfs2_trans_end(sdp);
+	gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
+		       GFS2_LFC_AIL_FLUSH);
+}
+
+/**
+ * gfs2_rgrp_metasync - sync out the metadata of a resource group
+ * @gl: the glock protecting the resource group
+ *
+ */
+
+static int gfs2_rgrp_metasync(struct gfs2_glock *gl)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct address_space *metamapping = gfs2_aspace(sdp);
+	struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
+	const unsigned bsize = sdp->sd_sb.sb_bsize;
+	loff_t start = (rgd->rd_addr * bsize) & PAGE_MASK;
+	loff_t end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
+	int error;
+
+	filemap_fdatawrite_range(metamapping, start, end);
+	error = filemap_fdatawait_range(metamapping, start, end);
+	WARN_ON_ONCE(error && !gfs2_withdrawn(sdp));
+	mapping_set_error(metamapping, error);
+	if (error)
+		gfs2_io_error(sdp);
+	return error;
+}
+
+/**
+ * rgrp_go_sync - sync out the metadata for this glock
+ * @gl: the glock
+ *
+ * Called when demoting or unlocking an EX glock.  We must flush
+ * to disk all dirty buffers/pages relating to this glock, and must not
+ * return to caller to demote/unlock the glock until I/O is complete.
+ */
+
+static int rgrp_go_sync(struct gfs2_glock *gl)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
+	int error;
+
+	if (!rgd || !test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
+		return 0;
+	GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
+
+	gfs2_log_flush(sdp, gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
+		       GFS2_LFC_RGRP_GO_SYNC);
+	error = gfs2_rgrp_metasync(gl);
+	if (!error)
+		error = gfs2_ail_empty_gl(gl);
+	gfs2_free_clones(rgd);
+	return error;
+}
+
+/**
+ * rgrp_go_inval - invalidate the metadata for this glock
+ * @gl: the glock
+ * @flags:
+ *
+ * We never used LM_ST_DEFERRED with resource groups, so that we
+ * should always see the metadata flag set here.
+ *
+ */
+
+static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct address_space *mapping = gfs2_aspace(sdp);
+	struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
+	const unsigned bsize = sdp->sd_sb.sb_bsize;
+	loff_t start, end;
+
+	if (!rgd)
+		return;
+	start = (rgd->rd_addr * bsize) & PAGE_MASK;
+	end = PAGE_ALIGN((rgd->rd_addr + rgd->rd_length) * bsize) - 1;
+	gfs2_rgrp_brelse(rgd);
+	WARN_ON_ONCE(!(flags & DIO_METADATA));
+	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
+	truncate_inode_pages_range(mapping, start, end);
+}
+
+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;
+
+	if (rgd)
+		gfs2_rgrp_dump(seq, rgd, fs_id_buf);
+}
+
+static struct gfs2_inode *gfs2_glock2inode(struct gfs2_glock *gl)
+{
+	struct gfs2_inode *ip;
+
+	spin_lock(&gl->gl_lockref.lock);
+	ip = gl->gl_object;
+	if (ip)
+		set_bit(GIF_GLOP_PENDING, &ip->i_flags);
+	spin_unlock(&gl->gl_lockref.lock);
+	return ip;
+}
+
+struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl)
+{
+	struct gfs2_rgrpd *rgd;
+
+	spin_lock(&gl->gl_lockref.lock);
+	rgd = gl->gl_object;
+	spin_unlock(&gl->gl_lockref.lock);
+
+	return rgd;
+}
+
+static void gfs2_clear_glop_pending(struct gfs2_inode *ip)
+{
+	if (!ip)
+		return;
+
+	clear_bit_unlock(GIF_GLOP_PENDING, &ip->i_flags);
+	wake_up_bit(&ip->i_flags, GIF_GLOP_PENDING);
+}
+
+/**
+ * gfs2_inode_metasync - sync out the metadata of an inode
+ * @gl: the glock protecting the inode
+ *
+ */
+int gfs2_inode_metasync(struct gfs2_glock *gl)
+{
+	struct address_space *metamapping = gfs2_glock2aspace(gl);
+	int error;
+
+	filemap_fdatawrite(metamapping);
+	error = filemap_fdatawait(metamapping);
+	if (error)
+		gfs2_io_error(glock_sbd(gl));
+	return error;
+}
+
+/**
+ * inode_go_sync - Sync the dirty metadata of an inode
+ * @gl: the glock protecting the inode
+ *
+ */
+
+static int inode_go_sync(struct gfs2_glock *gl)
+{
+	struct gfs2_inode *ip = gfs2_glock2inode(gl);
+	int isreg = ip && S_ISREG(ip->i_inode.i_mode);
+	struct address_space *metamapping = gfs2_glock2aspace(gl);
+	int error = 0, ret;
+
+	if (isreg) {
+		if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
+			unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
+		inode_dio_wait(&ip->i_inode);
+	}
+	if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
+		goto out;
+
+	GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
+
+	gfs2_log_flush(glock_sbd(gl), gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
+		       GFS2_LFC_INODE_GO_SYNC);
+	filemap_fdatawrite(metamapping);
+	if (isreg) {
+		struct address_space *mapping = ip->i_inode.i_mapping;
+		filemap_fdatawrite(mapping);
+		error = filemap_fdatawait(mapping);
+		mapping_set_error(mapping, error);
+	}
+	ret = gfs2_inode_metasync(gl);
+	if (!error)
+		error = ret;
+	ret = gfs2_ail_empty_gl(gl);
+	if (!error)
+		error = ret;
+	/*
+	 * Writeback of the data mapping may cause the dirty flag to be set
+	 * so we have to clear it again here.
+	 */
+	smp_mb__before_atomic();
+	clear_bit(GLF_DIRTY, &gl->gl_flags);
+
+out:
+	gfs2_clear_glop_pending(ip);
+	return error;
+}
+
+/**
+ * inode_go_inval - prepare a inode glock to be released
+ * @gl: the glock
+ * @flags:
+ *
+ * Normally we invalidate everything, but if we are moving into
+ * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
+ * can keep hold of the metadata, since it won't have changed.
+ *
+ */
+
+static void inode_go_inval(struct gfs2_glock *gl, int flags)
+{
+	struct gfs2_inode *ip = gfs2_glock2inode(gl);
+
+	gfs2_assert_withdraw(glock_sbd(gl), !atomic_read(&gl->gl_ail_count));
+
+	if (flags & DIO_METADATA) {
+		struct address_space *mapping = gfs2_glock2aspace(gl);
+		truncate_inode_pages(mapping, 0);
+		if (ip) {
+			set_bit(GLF_INSTANTIATE_NEEDED, &gl->gl_flags);
+			forget_all_cached_acls(&ip->i_inode);
+			security_inode_invalidate_secctx(&ip->i_inode);
+			gfs2_dir_hash_inval(ip);
+		}
+	}
+
+	if (ip == GFS2_I(glock_sbd(gl)->sd_rindex)) {
+		gfs2_log_flush(glock_sbd(gl), NULL,
+			       GFS2_LOG_HEAD_FLUSH_NORMAL |
+			       GFS2_LFC_INODE_GO_INVAL);
+		glock_sbd(gl)->sd_rindex_uptodate = 0;
+	}
+	if (ip && S_ISREG(ip->i_inode.i_mode))
+		truncate_inode_pages(ip->i_inode.i_mapping, 0);
+
+	gfs2_clear_glop_pending(ip);
+}
+
+static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	const struct gfs2_dinode *str = buf;
+	struct timespec64 atime, iatime;
+	u16 height, depth;
+	umode_t mode = be32_to_cpu(str->di_mode);
+	struct inode *inode = &ip->i_inode;
+	bool is_new = inode_state_read_once(inode) & I_NEW;
+
+	if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr))) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+	if (unlikely(!is_new && inode_wrong_type(inode, mode))) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+	ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
+	inode->i_mode = mode;
+	if (is_new) {
+		inode->i_rdev = 0;
+		switch (mode & S_IFMT) {
+		case S_IFBLK:
+		case S_IFCHR:
+			inode->i_rdev = MKDEV(be32_to_cpu(str->di_major),
+					      be32_to_cpu(str->di_minor));
+			break;
+		}
+	}
+
+	i_uid_write(inode, be32_to_cpu(str->di_uid));
+	i_gid_write(inode, be32_to_cpu(str->di_gid));
+	set_nlink(inode, be32_to_cpu(str->di_nlink));
+	i_size_write(inode, be64_to_cpu(str->di_size));
+	gfs2_set_inode_blocks(inode, be64_to_cpu(str->di_blocks));
+	atime.tv_sec = be64_to_cpu(str->di_atime);
+	atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
+	iatime = inode_get_atime(inode);
+	if (timespec64_compare(&iatime, &atime) < 0)
+		inode_set_atime_to_ts(inode, atime);
+	inode_set_mtime(inode, be64_to_cpu(str->di_mtime),
+			be32_to_cpu(str->di_mtime_nsec));
+	inode_set_ctime(inode, be64_to_cpu(str->di_ctime),
+			be32_to_cpu(str->di_ctime_nsec));
+
+	ip->i_goal = be64_to_cpu(str->di_goal_meta);
+	ip->i_generation = be64_to_cpu(str->di_generation);
+
+	ip->i_diskflags = be32_to_cpu(str->di_flags);
+	ip->i_eattr = be64_to_cpu(str->di_eattr);
+	/* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
+	gfs2_set_inode_flags(inode);
+	height = be16_to_cpu(str->di_height);
+	if (unlikely(height > sdp->sd_max_height)) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+	ip->i_height = (u8)height;
+
+	depth = be16_to_cpu(str->di_depth);
+	if (unlikely(depth > GFS2_DIR_MAX_DEPTH)) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+	if ((ip->i_diskflags & GFS2_DIF_EXHASH) &&
+	    depth < ilog2(sdp->sd_hash_ptrs)) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+	ip->i_depth = (u8)depth;
+	ip->i_entries = be32_to_cpu(str->di_entries);
+
+	if (!S_ISDIR(inode->i_mode) && (ip->i_diskflags & GFS2_DIF_EXHASH)) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+
+	if (gfs2_is_stuffed(ip) && inode->i_size > gfs2_max_stuffed_size(ip)) {
+		gfs2_consist_inode(ip);
+		return -EIO;
+	}
+	if (S_ISREG(inode->i_mode))
+		gfs2_set_aops(inode);
+
+	return 0;
+}
+
+/**
+ * gfs2_inode_refresh - Refresh the incore copy of the dinode
+ * @ip: The GFS2 inode
+ *
+ * Returns: errno
+ */
+
+static int gfs2_inode_refresh(struct gfs2_inode *ip)
+{
+	struct buffer_head *dibh;
+	int error;
+
+	error = gfs2_meta_inode_buffer(ip, &dibh);
+	if (error)
+		return error;
+
+	error = gfs2_dinode_in(ip, dibh->b_data);
+	brelse(dibh);
+	return error;
+}
+
+/**
+ * inode_go_instantiate - read in an inode if necessary
+ * @gl: The glock
+ *
+ * Returns: errno
+ */
+
+static int inode_go_instantiate(struct gfs2_glock *gl)
+{
+	struct gfs2_inode *ip = gl->gl_object;
+	struct gfs2_glock *io_gl;
+	int error;
+
+	if (!ip) /* no inode to populate - read it in later */
+		return 0;
+
+	error = gfs2_inode_refresh(ip);
+	if (error)
+		return error;
+	io_gl = ip->i_iopen_gh.gh_gl;
+	io_gl->gl_no_formal_ino = ip->i_no_formal_ino;
+	return 0;
+}
+
+static int inode_go_held(struct gfs2_holder *gh)
+{
+	struct gfs2_glock *gl = gh->gh_gl;
+	struct gfs2_inode *ip = gl->gl_object;
+	int error = 0;
+
+	if (!ip) /* no inode to populate - read it in later */
+		return 0;
+
+	if (gh->gh_state != LM_ST_DEFERRED)
+		inode_dio_wait(&ip->i_inode);
+
+	if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
+	    (gl->gl_state == LM_ST_EXCLUSIVE) &&
+	    (gh->gh_state == LM_ST_EXCLUSIVE))
+		error = gfs2_truncatei_resume(ip);
+
+	return error;
+}
+
+/**
+ * inode_go_dump - print information about an inode
+ * @seq: The iterator
+ * @gl: The glock
+ * @fs_id_buf: file system id (may be empty)
+ *
+ */
+
+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;
+	const struct inode *inode = &ip->i_inode;
+
+	if (ip == NULL)
+		return;
+
+	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(inode->i_mode), ip->i_flags,
+		  (unsigned int)ip->i_diskflags,
+		  (unsigned long long)i_size_read(inode),
+		  inode->i_data.nrpages);
+}
+
+/**
+ * freeze_go_callback - A cluster node is requesting a freeze
+ * @gl: the glock
+ * @remote: true if this came from a different cluster node
+ */
+
+static void freeze_go_callback(struct gfs2_glock *gl, bool remote)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct super_block *sb = sdp->sd_vfs;
+
+	if (!remote ||
+	    (gl->gl_state != LM_ST_SHARED &&
+	     gl->gl_state != LM_ST_UNLOCKED) ||
+	    gl->gl_demote_state != LM_ST_UNLOCKED)
+		return;
+
+	/*
+	 * Try to get an active super block reference to prevent racing with
+	 * unmount (see super_trylock_shared()).  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 (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);
+	}
+}
+
+/**
+ * freeze_go_xmote_bh - After promoting/demoting the freeze glock
+ * @gl: the glock
+ */
+static int freeze_go_xmote_bh(struct gfs2_glock *gl)
+{
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
+	struct gfs2_glock *j_gl = ip->i_gl;
+	struct gfs2_log_header_host head;
+	int error;
+
+	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+		j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
+
+		error = gfs2_find_jhead(sdp->sd_jdesc, &head);
+		if (gfs2_assert_withdraw(sdp, !error))
+			return error;
+		if (gfs2_assert_withdraw(sdp, head.lh_flags &
+					 GFS2_LOG_HEAD_UNMOUNT))
+			return -EIO;
+		gfs2_log_pointers_init(sdp, &head);
+	}
+	return 0;
+}
+
+/**
+ * iopen_go_callback - schedule the dcache entry for the inode to be deleted
+ * @gl: the glock
+ * @remote: true if this came from a different cluster node
+ *
+ * gl_lockref.lock lock is held while calling this
+ */
+static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
+{
+	struct gfs2_inode *ip = gl->gl_object;
+	struct gfs2_sbd *sdp = glock_sbd(gl);
+
+	if (!remote || test_bit(SDF_KILL, &sdp->sd_flags))
+		return;
+
+	if (gl->gl_demote_state == LM_ST_UNLOCKED &&
+	    gl->gl_state == LM_ST_SHARED && ip) {
+		gl->gl_lockref.count++;
+		if (!gfs2_queue_try_to_evict(gl))
+			gl->gl_lockref.count--;
+	}
+}
+
+const struct gfs2_glock_operations gfs2_meta_glops = {
+	.go_type = LM_TYPE_META,
+};
+
+const struct gfs2_glock_operations gfs2_inode_glops = {
+	.go_sync = inode_go_sync,
+	.go_inval = inode_go_inval,
+	.go_instantiate = inode_go_instantiate,
+	.go_held = inode_go_held,
+	.go_dump = inode_go_dump,
+	.go_type = LM_TYPE_INODE,
+	.go_flags = GLOF_ASPACE | GLOF_LVB,
+};
+
+const struct gfs2_glock_operations gfs2_rgrp_glops = {
+	.go_sync = rgrp_go_sync,
+	.go_inval = rgrp_go_inval,
+	.go_instantiate = gfs2_rgrp_go_instantiate,
+	.go_dump = gfs2_rgrp_go_dump,
+	.go_type = LM_TYPE_RGRP,
+	.go_flags = GLOF_LVB,
+};
+
+const struct gfs2_glock_operations gfs2_freeze_glops = {
+	.go_xmote_bh = freeze_go_xmote_bh,
+	.go_callback = freeze_go_callback,
+	.go_type = LM_TYPE_NONDISK,
+};
+
+const struct gfs2_glock_operations gfs2_iopen_glops = {
+	.go_type = LM_TYPE_IOPEN,
+	.go_callback = iopen_go_callback,
+	.go_dump = inode_go_dump,
+	.go_subclass = 1,
+};
+
+const struct gfs2_glock_operations gfs2_flock_glops = {
+	.go_type = LM_TYPE_FLOCK,
+};
+
+const struct gfs2_glock_operations gfs2_nondisk_glops = {
+	.go_type = LM_TYPE_NONDISK,
+};
+
+const struct gfs2_glock_operations gfs2_quota_glops = {
+	.go_type = LM_TYPE_QUOTA,
+	.go_flags = GLOF_LVB,
+};
+
+const struct gfs2_glock_operations gfs2_journal_glops = {
+	.go_type = LM_TYPE_JOURNAL,
+};
+
+const struct gfs2_glock_operations *gfs2_glops_list[] = {
+	[LM_TYPE_META] = &gfs2_meta_glops,
+	[LM_TYPE_INODE] = &gfs2_inode_glops,
+	[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
+	[LM_TYPE_IOPEN] = &gfs2_iopen_glops,
+	[LM_TYPE_FLOCK] = &gfs2_flock_glops,
+	[LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
+	[LM_TYPE_QUOTA] = &gfs2_quota_glops,
+	[LM_TYPE_JOURNAL] = &gfs2_journal_glops,
+};
+