[net-next-2.6.git] / fs / gfs2 / glops.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 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 <linux/bio.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);
	if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
		gl->gl_sbd->sd_rindex_uptodate = 0;
	else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
		struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;

		rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
	}
}

/**
 * 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_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 || (gh->gh_flags & GL_SKIP))
		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;
}

/**
 * inode_go_dump - print information about an inode
 * @seq: The iterator
 * @ip: the inode
 *
 * Returns: 0 on success, -ENOBUFS when we run out of space
 */

static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
{
	const struct gfs2_inode *ip = gl->gl_object;
	if (ip == NULL)
		return 0;
	gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%08lx\n",
		  (unsigned long long)ip->i_no_formal_ino,
		  (unsigned long long)ip->i_no_addr,
		  IF2DT(ip->i_inode.i_mode), ip->i_flags);
	return 0;
}

/**
 * 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);
}

/**
 * rgrp_go_dump - print out an rgrp
 * @seq: The iterator
 * @gl: The glock in question
 *
 */

static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
{
	const struct gfs2_rgrpd *rgd = gl->gl_object;
	if (rgd == NULL)
		return 0;
	gfs2_print_dbg(seq, " R: n:%llu\n", (unsigned long long)rgd->rd_addr);
	return 0;
}

/**
 * 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 int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
{
	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 (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);
		}
	}
	return 0;
}

/**
 * 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_inval = inode_go_inval,
	.go_demote_ok = inode_go_demote_ok,
	.go_lock = inode_go_lock,
	.go_dump = inode_go_dump,
	.go_type = LM_TYPE_INODE,
	.go_min_hold_time = HZ / 5,
};

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_dump = rgrp_go_dump,
	.go_type = LM_TYPE_RGRP,
	.go_min_hold_time = HZ / 5,
};

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.
cf45b752	3	* Copyright (C) 2004-2008 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>
6802e340	16	#include <linux/bio.h>
b3b94faa DT	17
b3b94faa DT	18	#include "gfs2.h"
5c676f6d	19	#include "incore.h"
b3b94faa DT	20	#include "bmap.h"
	21	#include "glock.h"
	22	#include "glops.h"
	23	#include "inode.h"
	24	#include "log.h"
	25	#include "meta_io.h"
b3b94faa DT	26	#include "recovery.h"
b3b94faa DT	27	#include "rgrp.h"
5c676f6d	28	#include "util.h"
ddacfaf7	29	#include "trans.h"
b3b94faa	30
ddacfaf7 SW	31	/**
	32	* ail_empty_gl - remove all buffers for a given lock from the AIL
	33	* @gl: the glock
	34	*
	35	* None of the buffers should be dirty, locked, or pinned.
	36	*/
	37
	38	static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
	39	{
	40	struct gfs2_sbd *sdp = gl->gl_sbd;
	41	unsigned int blocks;
	42	struct list_head *head = &gl->gl_ail_list;
	43	struct gfs2_bufdata *bd;
	44	struct buffer_head *bh;
ddacfaf7 SW	45	int error;
	46
	47	blocks = atomic_read(&gl->gl_ail_count);
	48	if (!blocks)
	49	return;
	50
	51	error = gfs2_trans_begin(sdp, 0, blocks);
	52	if (gfs2_assert_withdraw(sdp, !error))
	53	return;
	54
	55	gfs2_log_lock(sdp);
	56	while (!list_empty(head)) {
	57	bd = list_entry(head->next, struct gfs2_bufdata,
	58	bd_ail_gl_list);
	59	bh = bd->bd_bh;
f91a0d3e	60	gfs2_remove_from_ail(bd);
1ad38c43 SW	61	bd->bd_bh = NULL;
	62	bh->b_private = NULL;
	63	bd->bd_blkno = bh->b_blocknr;
	64	gfs2_assert_withdraw(sdp, !buffer_busy(bh));
	65	gfs2_trans_add_revoke(sdp, bd);
ddacfaf7 SW	66	}
	67	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	68	gfs2_log_unlock(sdp);
	69
	70	gfs2_trans_end(sdp);
	71	gfs2_log_flush(sdp, NULL);
	72	}
ba7f7290 SW	73
	74	/**
	75	* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
	76	* @gl: the glock
	77	*
	78	*/
	79
	80	static void gfs2_pte_inval(struct gfs2_glock *gl)
	81	{
	82	struct gfs2_inode *ip;
	83	struct inode *inode;
	84
	85	ip = gl->gl_object;
	86	inode = &ip->i_inode;
b60623c2	87	if (!ip \|\| !S_ISREG(inode->i_mode))
ba7f7290 SW	88	return;
ba7f7290 SW	89
ba7f7290	90	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
ba7f7290 SW	91	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
	92	set_bit(GLF_DIRTY, &gl->gl_flags);
	93
ba7f7290 SW	94	}
ba7f7290 SW	95
b3b94faa DT	96	/**
	97	* meta_go_sync - sync out the metadata for this glock
	98	* @gl: the glock
b3b94faa DT	99	*
	100	* Called when demoting or unlocking an EX glock. We must flush
	101	* to disk all dirty buffers/pages relating to this glock, and must not
	102	* not return to caller to demote/unlock the glock until I/O is complete.
	103	*/
	104
1a14d3a6	105	static void meta_go_sync(struct gfs2_glock *gl)
b3b94faa	106	{
b5d32bea SW	107	if (gl->gl_state != LM_ST_EXCLUSIVE)
	108	return;
	109
b3b94faa	110	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	111	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0	112	gfs2_meta_sync(gl);
1a14d3a6	113	gfs2_ail_empty_gl(gl);
b3b94faa	114	}
b3b94faa DT	115	}
	116
	117	/**
	118	* meta_go_inval - invalidate the metadata for this glock
	119	* @gl: the glock
	120	* @flags:
	121	*
	122	*/
	123
	124	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	125	{
	126	if (!(flags & DIO_METADATA))
	127	return;
	128
	129	gfs2_meta_inval(gl);
cf45b752 BP	130	if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
	131	gl->gl_sbd->sd_rindex_uptodate = 0;
	132	else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
	133	struct gfs2_rgrpd rgd = (struct gfs2_rgrpd )gl->gl_object;
	134
	135	rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
	136	}
b3b94faa DT	137	}
b3b94faa DT	138
b5d32bea SW	139	/**
	140	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	141	* @gl: the glock protecting the inode
	142	*
	143	*/
	144
	145	static void inode_go_sync(struct gfs2_glock *gl)
	146	{
	147	struct gfs2_inode *ip = gl->gl_object;
3042a2cc SW	148	struct address_space *metamapping = gl->gl_aspace->i_mapping;
	149	int error;
	150
	151	if (gl->gl_state != LM_ST_UNLOCKED)
	152	gfs2_pte_inval(gl);
	153	if (gl->gl_state != LM_ST_EXCLUSIVE)
	154	return;
b5d32bea SW	155
	156	if (ip && !S_ISREG(ip->i_inode.i_mode))
	157	ip = NULL;
	158
	159	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
b524fe64	160	gfs2_log_flush(gl->gl_sbd, gl);
3042a2cc	161	filemap_fdatawrite(metamapping);
b5d32bea SW	162	if (ip) {
b5d32bea SW	163	struct address_space *mapping = ip->i_inode.i_mapping;
3042a2cc SW	164	filemap_fdatawrite(mapping);
3042a2cc SW	165	error = filemap_fdatawait(mapping);
3e9f45bd	166	mapping_set_error(mapping, error);
b5d32bea	167	}
3042a2cc SW	168	error = filemap_fdatawait(metamapping);
3042a2cc SW	169	mapping_set_error(metamapping, error);
b5d32bea SW	170	clear_bit(GLF_DIRTY, &gl->gl_flags);
	171	gfs2_ail_empty_gl(gl);
	172	}
	173	}
	174
b3b94faa DT	175	/**
	176	* inode_go_inval - prepare a inode glock to be released
	177	* @gl: the glock
	178	* @flags:
	179	*
	180	*/
	181
	182	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	183	{
b004157a	184	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	185	int meta = (flags & DIO_METADATA);
b3b94faa DT	186
	187	if (meta) {
	188	gfs2_meta_inval(gl);
b004157a SW	189	if (ip)
	190	set_bit(GIF_INVALID, &ip->i_flags);
	191	}
	192
3cc3f710	193	if (ip && S_ISREG(ip->i_inode.i_mode))
b004157a	194	truncate_inode_pages(ip->i_inode.i_mapping, 0);
b3b94faa DT	195	}
	196
	197	/**
	198	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	199	* @gl: the glock
	200	*
	201	* Returns: 1 if it's ok
	202	*/
	203
	204	static int inode_go_demote_ok(struct gfs2_glock *gl)
	205	{
	206	struct gfs2_sbd *sdp = gl->gl_sbd;
	207	int demote = 0;
	208
5c676f6d	209	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	210	demote = 1;
	211	else if (!sdp->sd_args.ar_localcaching &&
	212	time_after_eq(jiffies, gl->gl_stamp +
	213	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	214	demote = 1;
	215
	216	return demote;
	217	}
	218
	219	/**
	220	* inode_go_lock - operation done after an inode lock is locked by a process
	221	* @gl: the glock
	222	* @flags:
	223	*
	224	* Returns: errno
	225	*/
	226
	227	static int inode_go_lock(struct gfs2_holder *gh)
	228	{
	229	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	230	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	231	int error = 0;
b3b94faa DT	232
091806ed	233	if (!ip \|\| (gh->gh_flags & GL_SKIP))
b3b94faa DT	234	return 0;
b3b94faa DT	235
bfded27b	236	if (test_bit(GIF_INVALID, &ip->i_flags)) {
b3b94faa DT	237	error = gfs2_inode_refresh(ip);
	238	if (error)
	239	return error;
b3b94faa DT	240	}
	241
	242	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	243	(gl->gl_state == LM_ST_EXCLUSIVE) &&
1c0f4872	244	(gh->gh_state == LM_ST_EXCLUSIVE))
b3b94faa DT	245	error = gfs2_truncatei_resume(ip);
	246
	247	return error;
	248	}
	249
6802e340 SW	250	/**
	251	* inode_go_dump - print information about an inode
	252	* @seq: The iterator
	253	* @ip: the inode
	254	*
	255	* Returns: 0 on success, -ENOBUFS when we run out of space
	256	*/
	257
	258	static int inode_go_dump(struct seq_file seq, const struct gfs2_glock gl)
	259	{
	260	const struct gfs2_inode *ip = gl->gl_object;
	261	if (ip == NULL)
	262	return 0;
	263	gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%08lx\n",
	264	(unsigned long long)ip->i_no_formal_ino,
	265	(unsigned long long)ip->i_no_addr,
	266	IF2DT(ip->i_inode.i_mode), ip->i_flags);
	267	return 0;
	268	}
	269
b3b94faa DT	270	/**
	271	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	272	* @gl: the glock
	273	*
	274	* Returns: 1 if it's ok
	275	*/
	276
	277	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	278	{
	279	return !gl->gl_aspace->i_mapping->nrpages;
	280	}
	281
	282	/**
	283	* rgrp_go_lock - operation done after an rgrp lock is locked by
	284	* a first holder on this node.
	285	* @gl: the glock
	286	* @flags:
	287	*
	288	* Returns: errno
	289	*/
	290
	291	static int rgrp_go_lock(struct gfs2_holder *gh)
	292	{
5c676f6d	293	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	294	}
	295
	296	/**
	297	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	298	* a last holder on this node.
	299	* @gl: the glock
	300	* @flags:
	301	*
	302	*/
	303
	304	static void rgrp_go_unlock(struct gfs2_holder *gh)
	305	{
5c676f6d	306	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	307	}
b3b94faa DT	308
6802e340 SW	309	/**
	310	* rgrp_go_dump - print out an rgrp
	311	* @seq: The iterator
	312	* @gl: The glock in question
	313	*
	314	*/
	315
	316	static int rgrp_go_dump(struct seq_file seq, const struct gfs2_glock gl)
	317	{
	318	const struct gfs2_rgrpd *rgd = gl->gl_object;
	319	if (rgd == NULL)
	320	return 0;
	321	gfs2_print_dbg(seq, " R: n:%llu\n", (unsigned long long)rgd->rd_addr);
	322	return 0;
	323	}
	324
b3b94faa	325	/**
3042a2cc	326	* trans_go_sync - promote/demote the transaction glock
b3b94faa DT	327	* @gl: the glock
	328	* @state: the requested state
	329	* @flags:
	330	*
	331	*/
	332
3042a2cc	333	static void trans_go_sync(struct gfs2_glock *gl)
b3b94faa DT	334	{
	335	struct gfs2_sbd *sdp = gl->gl_sbd;
	336
	337	if (gl->gl_state != LM_ST_UNLOCKED &&
	338	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	339	gfs2_meta_syncfs(sdp);
	340	gfs2_log_shutdown(sdp);
	341	}
b3b94faa DT	342	}
	343
	344	/**
	345	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	346	* @gl: the glock
	347	*
	348	*/
	349
6802e340	350	static int trans_go_xmote_bh(struct gfs2_glock gl, struct gfs2_holder gh)
b3b94faa DT	351	{
b3b94faa DT	352	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	353	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	354	struct gfs2_glock *j_gl = ip->i_gl;
55167622	355	struct gfs2_log_header_host head;
b3b94faa DT	356	int error;
b3b94faa DT	357
6802e340	358	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
1a14d3a6	359	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
b3b94faa DT	360
	361	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	362	if (error)
	363	gfs2_consist(sdp);
	364	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	365	gfs2_consist(sdp);
	366
	367	/* Initialize some head of the log stuff */
	368	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	369	sdp->sd_log_sequence = head.lh_sequence + 1;
	370	gfs2_log_pointers_init(sdp, head.lh_blkno);
	371	}
	372	}
6802e340	373	return 0;
b3b94faa DT	374	}
b3b94faa DT	375
b3b94faa DT	376	/**
	377	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	378	* @gl: the glock
	379	*
	380	* Returns: 1 if it's ok
	381	*/
	382
	383	static int quota_go_demote_ok(struct gfs2_glock *gl)
	384	{
	385	return !atomic_read(&gl->gl_lvb_count);
	386	}
	387
8fb4b536	388	const struct gfs2_glock_operations gfs2_meta_glops = {
b5d32bea	389	.go_xmote_th = meta_go_sync,
ea67eedb	390	.go_type = LM_TYPE_META,
b3b94faa DT	391	};
b3b94faa DT	392
8fb4b536	393	const struct gfs2_glock_operations gfs2_inode_glops = {
3042a2cc	394	.go_xmote_th = inode_go_sync,
b3b94faa DT	395	.go_inval = inode_go_inval,
	396	.go_demote_ok = inode_go_demote_ok,
	397	.go_lock = inode_go_lock,
6802e340	398	.go_dump = inode_go_dump,
ea67eedb	399	.go_type = LM_TYPE_INODE,
6802e340	400	.go_min_hold_time = HZ / 5,
b3b94faa DT	401	};
b3b94faa DT	402
8fb4b536	403	const struct gfs2_glock_operations gfs2_rgrp_glops = {
cad5b939	404	.go_xmote_th = meta_go_sync,
b3b94faa DT	405	.go_inval = meta_go_inval,
	406	.go_demote_ok = rgrp_go_demote_ok,
	407	.go_lock = rgrp_go_lock,
	408	.go_unlock = rgrp_go_unlock,
6802e340	409	.go_dump = rgrp_go_dump,
ea67eedb	410	.go_type = LM_TYPE_RGRP,
6802e340	411	.go_min_hold_time = HZ / 5,
b3b94faa DT	412	};
b3b94faa DT	413
8fb4b536	414	const struct gfs2_glock_operations gfs2_trans_glops = {
3042a2cc	415	.go_xmote_th = trans_go_sync,
b3b94faa	416	.go_xmote_bh = trans_go_xmote_bh,
ea67eedb	417	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	418	};
b3b94faa DT	419
8fb4b536	420	const struct gfs2_glock_operations gfs2_iopen_glops = {
ea67eedb	421	.go_type = LM_TYPE_IOPEN,
b3b94faa DT	422	};
b3b94faa DT	423
8fb4b536	424	const struct gfs2_glock_operations gfs2_flock_glops = {
ea67eedb	425	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	426	};
b3b94faa DT	427
8fb4b536	428	const struct gfs2_glock_operations gfs2_nondisk_glops = {
ea67eedb	429	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	430	};
b3b94faa DT	431
8fb4b536	432	const struct gfs2_glock_operations gfs2_quota_glops = {
b3b94faa	433	.go_demote_ok = quota_go_demote_ok,
ea67eedb	434	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	435	};
b3b94faa DT	436
8fb4b536	437	const struct gfs2_glock_operations gfs2_journal_glops = {
ea67eedb	438	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	439	};
b3b94faa DT	440