1 files changed, 792 insertions, 0 deletions

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
new file mode 100644
index 0000000000..f41ca89d21
--- /dev/null
+++ b/fs/gfs2/glops.c
@@ -0,0 +1,792 @@
+// 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 "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;
+
+extern struct workqueue_struct *gfs2_control_wq;
+
+static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
+{
+	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+
+	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);
+	fs_err(sdp, "AIL glock %u:%llu mapping %p\n",
+	       gl->gl_name.ln_type, gl->gl_name.ln_number,
+	       gfs2_glock2aspace(gl));
+	gfs2_lm(sdp, "AIL error\n");
+	gfs2_withdraw_delayed(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 = gl->gl_name.ln_sbd;
+	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);
+
+	gfs2_log_lock(sdp);
+	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);
+	gfs2_log_unlock(sdp);
+}
+
+
+static int gfs2_ail_empty_gl(struct gfs2_glock *gl)
+{
+	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+	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.
+		 */
+		gfs2_log_lock(sdp);
+		have_revokes = !list_empty(&sdp->sd_log_revokes);
+		log_in_flight = atomic_read(&sdp->sd_log_in_flight);
+		gfs2_log_unlock(sdp);
+		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 = gl->gl_name.ln_sbd;
+	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 = gl->gl_name.ln_sbd;
+	struct address_space *metamapping = &sdp->sd_aspace;
+	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 = gl->gl_name.ln_sbd;
+	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 = gl->gl_name.ln_sbd;
+	struct address_space *mapping = &sdp->sd_aspace;
+	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));
+	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(gl->gl_name.ln_sbd);
+	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(gl->gl_name.ln_sbd, 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);
+
+	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(gl->gl_name.ln_sbd->sd_rindex)) {
+		gfs2_log_flush(gl->gl_name.ln_sbd, NULL,
+			       GFS2_LOG_HEAD_FLUSH_NORMAL |
+			       GFS2_LFC_INODE_GO_INVAL);
+		gl->gl_name.ln_sbd->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);
+}
+
+/**
+ * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int inode_go_demote_ok(const struct gfs2_glock *gl)
+{
+	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+
+	if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
+		return 0;
+
+	return 1;
+}
+
+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;
+	u16 height, depth;
+	umode_t mode = be32_to_cpu(str->di_mode);
+	struct inode *inode = &ip->i_inode;
+	bool is_new = inode->i_state & I_NEW;
+
+	if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
+		goto corrupt;
+	if (unlikely(!is_new && inode_wrong_type(inode, mode)))
+		goto corrupt;
+	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);
+	if (timespec64_compare(&inode->i_atime, &atime) < 0)
+		inode->i_atime = atime;
+	inode->i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
+	inode->i_mtime.tv_nsec = 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))
+		goto corrupt;
+	ip->i_height = (u8)height;
+
+	depth = be16_to_cpu(str->di_depth);
+	if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
+		goto corrupt;
+	ip->i_depth = (u8)depth;
+	ip->i_entries = be32_to_cpu(str->di_entries);
+
+	if (gfs2_is_stuffed(ip) && inode->i_size > gfs2_max_stuffed_size(ip))
+		goto corrupt;
+
+	if (S_ISREG(inode->i_mode))
+		gfs2_set_aops(inode);
+
+	return 0;
+corrupt:
+	gfs2_consist_inode(ip);
+	return -EIO;
+}
+
+/**
+ * gfs2_inode_refresh - Refresh the incore copy of the dinode
+ * @ip: The GFS2 inode
+ *
+ * Returns: errno
+ */
+
+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
+ * @gh: The glock holder
+ *
+ * Returns: errno
+ */
+
+static int inode_go_instantiate(struct gfs2_glock *gl)
+{
+	struct gfs2_inode *ip = gl->gl_object;
+
+	if (!ip) /* no inode to populate - read it in later */
+		return 0;
+
+	return gfs2_inode_refresh(ip);
+}
+
+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 = gl->gl_name.ln_sbd;
+	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 = gl->gl_name.ln_sbd;
+	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, false);
+		if (gfs2_assert_withdraw_delayed(sdp, !error))
+			return error;
+		if (gfs2_assert_withdraw_delayed(sdp, head.lh_flags &
+						 GFS2_LOG_HEAD_UNMOUNT))
+			return -EIO;
+		sdp->sd_log_sequence = head.lh_sequence + 1;
+		gfs2_log_pointers_init(sdp, head.lh_blkno);
+	}
+	return 0;
+}
+
+/**
+ * freeze_go_demote_ok
+ * @gl: the glock
+ *
+ * Always returns 0
+ */
+
+static int freeze_go_demote_ok(const struct gfs2_glock *gl)
+{
+	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 = gl->gl_name.ln_sbd;
+
+	if (!remote || sb_rdonly(sdp->sd_vfs) ||
+	    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--;
+	}
+}
+
+/**
+ * inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
+ * @gl: glock being freed
+ *
+ * For now, this is only used for the journal inode glock. In withdraw
+ * situations, we need to wait for the glock to be freed so that we know
+ * other nodes may proceed with recovery / journal replay.
+ */
+static void inode_go_free(struct gfs2_glock *gl)
+{
+	/* Note that we cannot reference gl_object because it's already set
+	 * to NULL by this point in its lifecycle. */
+	if (!test_bit(GLF_FREEING, &gl->gl_flags))
+		return;
+	clear_bit_unlock(GLF_FREEING, &gl->gl_flags);
+	wake_up_bit(&gl->gl_flags, GLF_FREEING);
+}
+
+/**
+ * nondisk_go_callback - used to signal when a node did a withdraw
+ * @gl: the nondisk glock
+ * @remote: true if this came from a different cluster node
+ *
+ */
+static void nondisk_go_callback(struct gfs2_glock *gl, bool remote)
+{
+	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
+
+	/* Ignore the callback unless it's from another node, and it's the
+	   live lock. */
+	if (!remote || gl->gl_name.ln_number != GFS2_LIVE_LOCK)
+		return;
+
+	/* First order of business is to cancel the demote request. We don't
+	 * really want to demote a nondisk glock. At best it's just to inform
+	 * us of another node's withdraw. We'll keep it in SH mode. */
+	clear_bit(GLF_DEMOTE, &gl->gl_flags);
+	clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
+
+	/* Ignore the unlock if we're withdrawn, unmounting, or in recovery. */
+	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) ||
+	    test_bit(SDF_WITHDRAWN, &sdp->sd_flags) ||
+	    test_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags))
+		return;
+
+	/* We only care when a node wants us to unlock, because that means
+	 * they want a journal recovered. */
+	if (gl->gl_demote_state != LM_ST_UNLOCKED)
+		return;
+
+	if (sdp->sd_args.ar_spectator) {
+		fs_warn(sdp, "Spectator node cannot recover journals.\n");
+		return;
+	}
+
+	fs_warn(sdp, "Some node has withdrawn; checking for recovery.\n");
+	set_bit(SDF_REMOTE_WITHDRAW, &sdp->sd_flags);
+	/*
+	 * We can't call remote_withdraw directly here or gfs2_recover_journal
+	 * because this is called from the glock unlock function and the
+	 * remote_withdraw needs to enqueue and dequeue the same "live" glock
+	 * we were called from. So we queue it to the control work queue in
+	 * lock_dlm.
+	 */
+	queue_delayed_work(gfs2_control_wq, &sdp->sd_control_work, 0);
+}
+
+const struct gfs2_glock_operations gfs2_meta_glops = {
+	.go_type = LM_TYPE_META,
+	.go_flags = GLOF_NONDISK,
+};
+
+const struct gfs2_glock_operations gfs2_inode_glops = {
+	.go_sync = inode_go_sync,
+	.go_inval = inode_go_inval,
+	.go_demote_ok = inode_go_demote_ok,
+	.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_LRU | GLOF_LVB,
+	.go_free = inode_go_free,
+};
+
+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_demote_ok = freeze_go_demote_ok,
+	.go_callback = freeze_go_callback,
+	.go_type = LM_TYPE_NONDISK,
+	.go_flags = GLOF_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_flags = GLOF_LRU | GLOF_NONDISK,
+	.go_subclass = 1,
+};
+
+const struct gfs2_glock_operations gfs2_flock_glops = {
+	.go_type = LM_TYPE_FLOCK,
+	.go_flags = GLOF_LRU | GLOF_NONDISK,
+};
+
+const struct gfs2_glock_operations gfs2_nondisk_glops = {
+	.go_type = LM_TYPE_NONDISK,
+	.go_flags = GLOF_NONDISK,
+	.go_callback = nondisk_go_callback,
+};
+
+const struct gfs2_glock_operations gfs2_quota_glops = {
+	.go_type = LM_TYPE_QUOTA,
+	.go_flags = GLOF_LVB | GLOF_LRU | GLOF_NONDISK,
+};
+
+const struct gfs2_glock_operations gfs2_journal_glops = {
+	.go_type = LM_TYPE_JOURNAL,
+	.go_flags = GLOF_NONDISK,
+};
+
+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,
+};
+