[deliverable/linux.git] / fs / gfs2 / glops.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.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"

/**
 * ail_empty_gl - remove all buffers for a given lock from the AIL
 * @gl: the glock
 *
 * None of the buffers should be dirty, locked, or pinned.
 */

static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;
	unsigned int blocks;
	struct list_head *head = &gl->gl_ail_list;
	struct gfs2_bufdata *bd;
	struct buffer_head *bh;
	int error;

	blocks = atomic_read(&gl->gl_ail_count);
	if (!blocks)
		return;

	error = gfs2_trans_begin(sdp, 0, blocks);
	if (gfs2_assert_withdraw(sdp, !error))
		return;

	gfs2_log_lock(sdp);
	while (!list_empty(head)) {
		bd = list_entry(head->next, struct gfs2_bufdata,
				bd_ail_gl_list);
		bh = bd->bd_bh;
		gfs2_remove_from_ail(bd);
		bd->bd_bh = NULL;
		bh->b_private = NULL;
		bd->bd_blkno = bh->b_blocknr;
		gfs2_assert_withdraw(sdp, !buffer_busy(bh));
		gfs2_trans_add_revoke(sdp, bd);
	}
	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	gfs2_log_unlock(sdp);

	gfs2_trans_end(sdp);
	gfs2_log_flush(sdp, NULL);
}

/**
 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
 * @gl: the glock
 *
 */

static void gfs2_pte_inval(struct gfs2_glock *gl)
{
	struct gfs2_inode *ip;
	struct inode *inode;

	ip = gl->gl_object;
	inode = &ip->i_inode;
	if (!ip || !S_ISREG(inode->i_mode))
		return;

	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
		set_bit(GLF_DIRTY, &gl->gl_flags);

}

/**
 * meta_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
 * not return to caller to demote/unlock the glock until I/O is complete.
 */

static void meta_go_sync(struct gfs2_glock *gl)
{
	if (gl->gl_state != LM_ST_EXCLUSIVE)
		return;

	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
		gfs2_log_flush(gl->gl_sbd, gl);
		gfs2_meta_sync(gl);
		gfs2_ail_empty_gl(gl);
	}
}

/**
 * meta_go_inval - invalidate the metadata for this glock
 * @gl: the glock
 * @flags:
 *
 */

static void meta_go_inval(struct gfs2_glock *gl, int flags)
{
	if (!(flags & DIO_METADATA))
		return;

	gfs2_meta_inval(gl);
	gl->gl_vn++;
}

/**
 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 * @gl: the glock protecting the inode
 *
 */

static void inode_go_sync(struct gfs2_glock *gl)
{
	struct gfs2_inode *ip = gl->gl_object;
	struct address_space *metamapping = gl->gl_aspace->i_mapping;
	int error;

	if (gl->gl_state != LM_ST_UNLOCKED)
		gfs2_pte_inval(gl);
	if (gl->gl_state != LM_ST_EXCLUSIVE)
		return;

	if (ip && !S_ISREG(ip->i_inode.i_mode))
		ip = NULL;

	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
		gfs2_log_flush(gl->gl_sbd, gl);
		filemap_fdatawrite(metamapping);
		if (ip) {
			struct address_space *mapping = ip->i_inode.i_mapping;
			filemap_fdatawrite(mapping);
			error = filemap_fdatawait(mapping);
			mapping_set_error(mapping, error);
		}
		error = filemap_fdatawait(metamapping);
		mapping_set_error(metamapping, error);
		clear_bit(GLF_DIRTY, &gl->gl_flags);
		gfs2_ail_empty_gl(gl);
	}
}

/**
 * inode_go_xmote_bh - After promoting/demoting a glock
 * @gl: the glock
 *
 */

static void inode_go_xmote_bh(struct gfs2_glock *gl)
{
	struct gfs2_holder *gh = gl->gl_req_gh;
	struct buffer_head *bh;
	int error;

	if (gl->gl_state != LM_ST_UNLOCKED &&
	    (!gh || !(gh->gh_flags & GL_SKIP))) {
		error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
		if (!error)
			brelse(bh);
	}
}

/**
 * inode_go_inval - prepare a inode glock to be released
 * @gl: the glock
 * @flags:
 *
 */

static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
	struct gfs2_inode *ip = gl->gl_object;
	int meta = (flags & DIO_METADATA);

	if (meta) {
		gfs2_meta_inval(gl);
		if (ip)
			set_bit(GIF_INVALID, &ip->i_flags);
	}

	if (ip && S_ISREG(ip->i_inode.i_mode))
		truncate_inode_pages(ip->i_inode.i_mapping, 0);
}

/**
 * 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(struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;
	int demote = 0;

	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
		demote = 1;
	else if (!sdp->sd_args.ar_localcaching &&
		 time_after_eq(jiffies, gl->gl_stamp +
			       gfs2_tune_get(sdp, gt_demote_secs) * HZ))
		demote = 1;

	return demote;
}

/**
 * inode_go_lock - operation done after an inode lock is locked by a process
 * @gl: the glock
 * @flags:
 *
 * Returns: errno
 */

static int inode_go_lock(struct gfs2_holder *gh)
{
	struct gfs2_glock *gl = gh->gh_gl;
	struct gfs2_inode *ip = gl->gl_object;
	int error = 0;

	if (!ip)
		return 0;

	if (test_bit(GIF_INVALID, &ip->i_flags)) {
		error = gfs2_inode_refresh(ip);
		if (error)
			return error;
	}

	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	    (gl->gl_state == LM_ST_EXCLUSIVE) &&
	    (gh->gh_state == LM_ST_EXCLUSIVE))
		error = gfs2_truncatei_resume(ip);

	return error;
}

/**
 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 * @gl: the glock
 *
 * Returns: 1 if it's ok
 */

static int rgrp_go_demote_ok(struct gfs2_glock *gl)
{
	return !gl->gl_aspace->i_mapping->nrpages;
}

/**
 * rgrp_go_lock - operation done after an rgrp lock is locked by
 *    a first holder on this node.
 * @gl: the glock
 * @flags:
 *
 * Returns: errno
 */

static int rgrp_go_lock(struct gfs2_holder *gh)
{
	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
}

/**
 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 *    a last holder on this node.
 * @gl: the glock
 * @flags:
 *
 */

static void rgrp_go_unlock(struct gfs2_holder *gh)
{
	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
}

/**
 * trans_go_sync - promote/demote the transaction glock
 * @gl: the glock
 * @state: the requested state
 * @flags:
 *
 */

static void trans_go_sync(struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;

	if (gl->gl_state != LM_ST_UNLOCKED &&
	    test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
		gfs2_meta_syncfs(sdp);
		gfs2_log_shutdown(sdp);
	}
}

/**
 * trans_go_xmote_bh - After promoting/demoting the transaction glock
 * @gl: the glock
 *
 */

static void trans_go_xmote_bh(struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_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 (gl->gl_state != LM_ST_UNLOCKED &&
	    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 (error)
			gfs2_consist(sdp);
		if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
			gfs2_consist(sdp);

		/*  Initialize some head of the log stuff  */
		if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
			sdp->sd_log_sequence = head.lh_sequence + 1;
			gfs2_log_pointers_init(sdp, head.lh_blkno);
		}
	}
}

/**
 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 * @gl: the glock
 *
 * Returns: 1 if it's ok
 */

static int quota_go_demote_ok(struct gfs2_glock *gl)
{
	return !atomic_read(&gl->gl_lvb_count);
}

const struct gfs2_glock_operations gfs2_meta_glops = {
	.go_xmote_th = meta_go_sync,
	.go_type = LM_TYPE_META,
};

const struct gfs2_glock_operations gfs2_inode_glops = {
	.go_xmote_th = inode_go_sync,
	.go_xmote_bh = inode_go_xmote_bh,
	.go_inval = inode_go_inval,
	.go_demote_ok = inode_go_demote_ok,
	.go_lock = inode_go_lock,
	.go_type = LM_TYPE_INODE,
	.go_min_hold_time = HZ / 10,
};

const struct gfs2_glock_operations gfs2_rgrp_glops = {
	.go_xmote_th = meta_go_sync,
	.go_inval = meta_go_inval,
	.go_demote_ok = rgrp_go_demote_ok,
	.go_lock = rgrp_go_lock,
	.go_unlock = rgrp_go_unlock,
	.go_type = LM_TYPE_RGRP,
	.go_min_hold_time = HZ / 10,
};

const struct gfs2_glock_operations gfs2_trans_glops = {
	.go_xmote_th = trans_go_sync,
	.go_xmote_bh = trans_go_xmote_bh,
	.go_type = LM_TYPE_NONDISK,
};

const struct gfs2_glock_operations gfs2_iopen_glops = {
	.go_type = LM_TYPE_IOPEN,
};

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_demote_ok = quota_go_demote_ok,
	.go_type = LM_TYPE_QUOTA,
};

const struct gfs2_glock_operations gfs2_journal_glops = {
	.go_type = LM_TYPE_JOURNAL,
};
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
b3b94faa DT	9
b3b94faa DT	10	#include <linux/slab.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/completion.h>
	13	#include <linux/buffer_head.h>
5c676f6d	14	#include <linux/gfs2_ondisk.h>
7d308590	15	#include <linux/lm_interface.h>
b3b94faa DT	16
b3b94faa DT	17	#include "gfs2.h"
5c676f6d	18	#include "incore.h"
b3b94faa DT	19	#include "bmap.h"
	20	#include "glock.h"
	21	#include "glops.h"
	22	#include "inode.h"
	23	#include "log.h"
	24	#include "meta_io.h"
b3b94faa DT	25	#include "recovery.h"
b3b94faa DT	26	#include "rgrp.h"
5c676f6d	27	#include "util.h"
ddacfaf7	28	#include "trans.h"
b3b94faa	29
ddacfaf7 SW	30	/**
	31	* ail_empty_gl - remove all buffers for a given lock from the AIL
	32	* @gl: the glock
	33	*
	34	* None of the buffers should be dirty, locked, or pinned.
	35	*/
	36
	37	static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
	38	{
	39	struct gfs2_sbd *sdp = gl->gl_sbd;
	40	unsigned int blocks;
	41	struct list_head *head = &gl->gl_ail_list;
	42	struct gfs2_bufdata *bd;
	43	struct buffer_head *bh;
ddacfaf7 SW	44	int error;
	45
	46	blocks = atomic_read(&gl->gl_ail_count);
	47	if (!blocks)
	48	return;
	49
	50	error = gfs2_trans_begin(sdp, 0, blocks);
	51	if (gfs2_assert_withdraw(sdp, !error))
	52	return;
	53
	54	gfs2_log_lock(sdp);
	55	while (!list_empty(head)) {
	56	bd = list_entry(head->next, struct gfs2_bufdata,
	57	bd_ail_gl_list);
	58	bh = bd->bd_bh;
f91a0d3e	59	gfs2_remove_from_ail(bd);
1ad38c43 SW	60	bd->bd_bh = NULL;
	61	bh->b_private = NULL;
	62	bd->bd_blkno = bh->b_blocknr;
	63	gfs2_assert_withdraw(sdp, !buffer_busy(bh));
	64	gfs2_trans_add_revoke(sdp, bd);
ddacfaf7 SW	65	}
	66	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	67	gfs2_log_unlock(sdp);
	68
	69	gfs2_trans_end(sdp);
	70	gfs2_log_flush(sdp, NULL);
	71	}
ba7f7290 SW	72
	73	/**
	74	* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
	75	* @gl: the glock
	76	*
	77	*/
	78
	79	static void gfs2_pte_inval(struct gfs2_glock *gl)
	80	{
	81	struct gfs2_inode *ip;
	82	struct inode *inode;
	83
	84	ip = gl->gl_object;
	85	inode = &ip->i_inode;
b60623c2	86	if (!ip \|\| !S_ISREG(inode->i_mode))
ba7f7290 SW	87	return;
ba7f7290 SW	88
ba7f7290	89	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
ba7f7290 SW	90	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
	91	set_bit(GLF_DIRTY, &gl->gl_flags);
	92
ba7f7290 SW	93	}
ba7f7290 SW	94
b3b94faa DT	95	/**
	96	* meta_go_sync - sync out the metadata for this glock
	97	* @gl: the glock
b3b94faa DT	98	*
	99	* Called when demoting or unlocking an EX glock. We must flush
	100	* to disk all dirty buffers/pages relating to this glock, and must not
	101	* not return to caller to demote/unlock the glock until I/O is complete.
	102	*/
	103
1a14d3a6	104	static void meta_go_sync(struct gfs2_glock *gl)
b3b94faa	105	{
b5d32bea SW	106	if (gl->gl_state != LM_ST_EXCLUSIVE)
	107	return;
	108
b3b94faa	109	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	110	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0	111	gfs2_meta_sync(gl);
1a14d3a6	112	gfs2_ail_empty_gl(gl);
b3b94faa	113	}
b3b94faa DT	114	}
	115
	116	/**
	117	* meta_go_inval - invalidate the metadata for this glock
	118	* @gl: the glock
	119	* @flags:
	120	*
	121	*/
	122
	123	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	124	{
	125	if (!(flags & DIO_METADATA))
	126	return;
	127
	128	gfs2_meta_inval(gl);
	129	gl->gl_vn++;
	130	}
	131
b5d32bea SW	132	/**
	133	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	134	* @gl: the glock protecting the inode
	135	*
	136	*/
	137
	138	static void inode_go_sync(struct gfs2_glock *gl)
	139	{
	140	struct gfs2_inode *ip = gl->gl_object;
3042a2cc SW	141	struct address_space *metamapping = gl->gl_aspace->i_mapping;
	142	int error;
	143
	144	if (gl->gl_state != LM_ST_UNLOCKED)
	145	gfs2_pte_inval(gl);
	146	if (gl->gl_state != LM_ST_EXCLUSIVE)
	147	return;
b5d32bea SW	148
	149	if (ip && !S_ISREG(ip->i_inode.i_mode))
	150	ip = NULL;
	151
	152	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
b524fe64	153	gfs2_log_flush(gl->gl_sbd, gl);
3042a2cc	154	filemap_fdatawrite(metamapping);
b5d32bea SW	155	if (ip) {
b5d32bea SW	156	struct address_space *mapping = ip->i_inode.i_mapping;
3042a2cc SW	157	filemap_fdatawrite(mapping);
3042a2cc SW	158	error = filemap_fdatawait(mapping);
3e9f45bd	159	mapping_set_error(mapping, error);
b5d32bea	160	}
3042a2cc SW	161	error = filemap_fdatawait(metamapping);
3042a2cc SW	162	mapping_set_error(metamapping, error);
b5d32bea SW	163	clear_bit(GLF_DIRTY, &gl->gl_flags);
	164	gfs2_ail_empty_gl(gl);
	165	}
	166	}
	167
b3b94faa DT	168	/**
	169	* inode_go_xmote_bh - After promoting/demoting a glock
	170	* @gl: the glock
	171	*
	172	*/
	173
	174	static void inode_go_xmote_bh(struct gfs2_glock *gl)
	175	{
	176	struct gfs2_holder *gh = gl->gl_req_gh;
	177	struct buffer_head *bh;
	178	int error;
	179
	180	if (gl->gl_state != LM_ST_UNLOCKED &&
	181	(!gh \|\| !(gh->gh_flags & GL_SKIP))) {
7276b3b0	182	error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
b3b94faa DT	183	if (!error)
	184	brelse(bh);
	185	}
	186	}
	187
b3b94faa DT	188	/**
	189	* inode_go_inval - prepare a inode glock to be released
	190	* @gl: the glock
	191	* @flags:
	192	*
	193	*/
	194
	195	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	196	{
b004157a	197	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	198	int meta = (flags & DIO_METADATA);
b3b94faa DT	199
	200	if (meta) {
	201	gfs2_meta_inval(gl);
b004157a SW	202	if (ip)
	203	set_bit(GIF_INVALID, &ip->i_flags);
	204	}
	205
3cc3f710	206	if (ip && S_ISREG(ip->i_inode.i_mode))
b004157a	207	truncate_inode_pages(ip->i_inode.i_mapping, 0);
b3b94faa DT	208	}
	209
	210	/**
	211	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	212	* @gl: the glock
	213	*
	214	* Returns: 1 if it's ok
	215	*/
	216
	217	static int inode_go_demote_ok(struct gfs2_glock *gl)
	218	{
	219	struct gfs2_sbd *sdp = gl->gl_sbd;
	220	int demote = 0;
	221
5c676f6d	222	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	223	demote = 1;
	224	else if (!sdp->sd_args.ar_localcaching &&
	225	time_after_eq(jiffies, gl->gl_stamp +
	226	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	227	demote = 1;
	228
	229	return demote;
	230	}
	231
	232	/**
	233	* inode_go_lock - operation done after an inode lock is locked by a process
	234	* @gl: the glock
	235	* @flags:
	236	*
	237	* Returns: errno
	238	*/
	239
	240	static int inode_go_lock(struct gfs2_holder *gh)
	241	{
	242	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	243	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	244	int error = 0;
	245
	246	if (!ip)
	247	return 0;
	248
bfded27b	249	if (test_bit(GIF_INVALID, &ip->i_flags)) {
b3b94faa DT	250	error = gfs2_inode_refresh(ip);
	251	if (error)
	252	return error;
b3b94faa DT	253	}
	254
	255	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	256	(gl->gl_state == LM_ST_EXCLUSIVE) &&
1c0f4872	257	(gh->gh_state == LM_ST_EXCLUSIVE))
b3b94faa DT	258	error = gfs2_truncatei_resume(ip);
	259
	260	return error;
	261	}
	262
b3b94faa DT	263	/**
	264	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	265	* @gl: the glock
	266	*
	267	* Returns: 1 if it's ok
	268	*/
	269
	270	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	271	{
	272	return !gl->gl_aspace->i_mapping->nrpages;
	273	}
	274
	275	/**
	276	* rgrp_go_lock - operation done after an rgrp lock is locked by
	277	* a first holder on this node.
	278	* @gl: the glock
	279	* @flags:
	280	*
	281	* Returns: errno
	282	*/
	283
	284	static int rgrp_go_lock(struct gfs2_holder *gh)
	285	{
5c676f6d	286	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	287	}
	288
	289	/**
	290	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	291	* a last holder on this node.
	292	* @gl: the glock
	293	* @flags:
	294	*
	295	*/
	296
	297	static void rgrp_go_unlock(struct gfs2_holder *gh)
	298	{
5c676f6d	299	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	300	}
	301
	302	/**
3042a2cc	303	* trans_go_sync - promote/demote the transaction glock
b3b94faa DT	304	* @gl: the glock
	305	* @state: the requested state
	306	* @flags:
	307	*
	308	*/
	309
3042a2cc	310	static void trans_go_sync(struct gfs2_glock *gl)
b3b94faa DT	311	{
	312	struct gfs2_sbd *sdp = gl->gl_sbd;
	313
	314	if (gl->gl_state != LM_ST_UNLOCKED &&
	315	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	316	gfs2_meta_syncfs(sdp);
	317	gfs2_log_shutdown(sdp);
	318	}
b3b94faa DT	319	}
	320
	321	/**
	322	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	323	* @gl: the glock
	324	*
	325	*/
	326
	327	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	328	{
	329	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	330	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	331	struct gfs2_glock *j_gl = ip->i_gl;
55167622	332	struct gfs2_log_header_host head;
b3b94faa DT	333	int error;
	334
	335	if (gl->gl_state != LM_ST_UNLOCKED &&
	336	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
1a14d3a6	337	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
b3b94faa DT	338
	339	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	340	if (error)
	341	gfs2_consist(sdp);
	342	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	343	gfs2_consist(sdp);
	344
	345	/* Initialize some head of the log stuff */
	346	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	347	sdp->sd_log_sequence = head.lh_sequence + 1;
	348	gfs2_log_pointers_init(sdp, head.lh_blkno);
	349	}
	350	}
	351	}
	352
b3b94faa DT	353	/**
	354	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	355	* @gl: the glock
	356	*
	357	* Returns: 1 if it's ok
	358	*/
	359
	360	static int quota_go_demote_ok(struct gfs2_glock *gl)
	361	{
	362	return !atomic_read(&gl->gl_lvb_count);
	363	}
	364
8fb4b536	365	const struct gfs2_glock_operations gfs2_meta_glops = {
b5d32bea	366	.go_xmote_th = meta_go_sync,
ea67eedb	367	.go_type = LM_TYPE_META,
b3b94faa DT	368	};
b3b94faa DT	369
8fb4b536	370	const struct gfs2_glock_operations gfs2_inode_glops = {
3042a2cc	371	.go_xmote_th = inode_go_sync,
b3b94faa	372	.go_xmote_bh = inode_go_xmote_bh,
b3b94faa DT	373	.go_inval = inode_go_inval,
	374	.go_demote_ok = inode_go_demote_ok,
	375	.go_lock = inode_go_lock,
ea67eedb	376	.go_type = LM_TYPE_INODE,
c4f68a13	377	.go_min_hold_time = HZ / 10,
b3b94faa DT	378	};
b3b94faa DT	379
8fb4b536	380	const struct gfs2_glock_operations gfs2_rgrp_glops = {
cad5b939	381	.go_xmote_th = meta_go_sync,
b3b94faa DT	382	.go_inval = meta_go_inval,
	383	.go_demote_ok = rgrp_go_demote_ok,
	384	.go_lock = rgrp_go_lock,
	385	.go_unlock = rgrp_go_unlock,
ea67eedb	386	.go_type = LM_TYPE_RGRP,
c4f68a13	387	.go_min_hold_time = HZ / 10,
b3b94faa DT	388	};
b3b94faa DT	389
8fb4b536	390	const struct gfs2_glock_operations gfs2_trans_glops = {
3042a2cc	391	.go_xmote_th = trans_go_sync,
b3b94faa	392	.go_xmote_bh = trans_go_xmote_bh,
ea67eedb	393	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	394	};
b3b94faa DT	395
8fb4b536	396	const struct gfs2_glock_operations gfs2_iopen_glops = {
ea67eedb	397	.go_type = LM_TYPE_IOPEN,
b3b94faa DT	398	};
b3b94faa DT	399
8fb4b536	400	const struct gfs2_glock_operations gfs2_flock_glops = {
ea67eedb	401	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	402	};
b3b94faa DT	403
8fb4b536	404	const struct gfs2_glock_operations gfs2_nondisk_glops = {
ea67eedb	405	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	406	};
b3b94faa DT	407
8fb4b536	408	const struct gfs2_glock_operations gfs2_quota_glops = {
b3b94faa	409	.go_demote_ok = quota_go_demote_ok,
ea67eedb	410	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	411	};
b3b94faa DT	412
8fb4b536	413	const struct gfs2_glock_operations gfs2_journal_glops = {
ea67eedb	414	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	415	};
b3b94faa DT	416