[mirror_ubuntu-zesty-kernel.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;
	u64 blkno;
	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;
		blkno = bh->b_blocknr;
		gfs2_assert_withdraw(sdp, !buffer_busy(bh));

		bd->bd_ail = NULL;
		list_del(&bd->bd_ail_st_list);
		list_del(&bd->bd_ail_gl_list);
		atomic_dec(&gl->gl_ail_count);
		brelse(bh);
		gfs2_log_unlock(sdp);

		gfs2_trans_add_revoke(sdp, blkno);

		gfs2_log_lock(sdp);
	}
	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;

	if (!test_bit(GIF_PAGED, &ip->i_flags))
		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);

	clear_bit(GIF_SW_PAGED, &ip->i_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;

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

	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
		if (ip)
			filemap_fdatawrite(ip->i_inode.i_mapping);
		gfs2_log_flush(gl->gl_sbd, gl);
		gfs2_meta_sync(gl);
		if (ip) {
			struct address_space *mapping = ip->i_inode.i_mapping;
			int error = filemap_fdatawait(mapping);
			mapping_set_error(mapping, error);
		}
		clear_bit(GLF_DIRTY, &gl->gl_flags);
		gfs2_ail_empty_gl(gl);
	}
}

/**
 * inode_go_xmote_th - promote/demote a glock
 * @gl: the glock
 * @state: the requested state
 * @flags:
 *
 */

static void inode_go_xmote_th(struct gfs2_glock *gl)
{
	if (gl->gl_state != LM_ST_UNLOCKED)
		gfs2_pte_inval(gl);
	if (gl->gl_state == LM_ST_EXCLUSIVE)
		inode_go_sync(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_drop_th - unlock a glock
 * @gl: the glock
 *
 * Invoked from rq_demote().
 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
 * is being purged from our node's glock cache; we're dropping lock.
 */

static void inode_go_drop_th(struct gfs2_glock *gl)
{
	gfs2_pte_inval(gl);
	if (gl->gl_state == LM_ST_EXCLUSIVE)
		inode_go_sync(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);
		clear_bit(GIF_PAGED, &ip->i_flags);
	}
}

/**
 * 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;
}

/**
 * inode_go_unlock - operation done before an inode lock is unlocked by a
 *		     process
 * @gl: the glock
 * @flags:
 *
 */

static void inode_go_unlock(struct gfs2_holder *gh)
{
	struct gfs2_glock *gl = gh->gh_gl;
	struct gfs2_inode *ip = gl->gl_object;

	if (ip)
		gfs2_meta_cache_flush(ip);
}

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

static void trans_go_xmote_th(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)) {
		gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
		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);
		}
	}
}

/**
 * trans_go_drop_th - unlock the transaction glock
 * @gl: the glock
 *
 * We want to sync the device even with localcaching.  Remember
 * that localcaching journal replay only marks buffers dirty.
 */

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

	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
		gfs2_meta_syncfs(sdp);
		gfs2_log_shutdown(sdp);
	}
}

/**
 * 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_drop_th = meta_go_sync,
	.go_type = LM_TYPE_META,
};

const struct gfs2_glock_operations gfs2_inode_glops = {
	.go_xmote_th = inode_go_xmote_th,
	.go_xmote_bh = inode_go_xmote_bh,
	.go_drop_th = inode_go_drop_th,
	.go_inval = inode_go_inval,
	.go_demote_ok = inode_go_demote_ok,
	.go_lock = inode_go_lock,
	.go_unlock = inode_go_unlock,
	.go_type = LM_TYPE_INODE,
};

const struct gfs2_glock_operations gfs2_rgrp_glops = {
	.go_xmote_th = meta_go_sync,
	.go_drop_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,
};

const struct gfs2_glock_operations gfs2_trans_glops = {
	.go_xmote_th = trans_go_xmote_th,
	.go_xmote_bh = trans_go_xmote_bh,
	.go_drop_th = trans_go_drop_th,
	.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;
	44	u64 blkno;
	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;
	60	blkno = bh->b_blocknr;
	61	gfs2_assert_withdraw(sdp, !buffer_busy(bh));
	62
	63	bd->bd_ail = NULL;
	64	list_del(&bd->bd_ail_st_list);
	65	list_del(&bd->bd_ail_gl_list);
	66	atomic_dec(&gl->gl_ail_count);
	67	brelse(bh);
	68	gfs2_log_unlock(sdp);
	69
	70	gfs2_trans_add_revoke(sdp, blkno);
	71
	72	gfs2_log_lock(sdp);
	73	}
	74	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	75	gfs2_log_unlock(sdp);
	76
	77	gfs2_trans_end(sdp);
	78	gfs2_log_flush(sdp, NULL);
	79	}
ba7f7290 SW	80
	81	/**
	82	* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
	83	* @gl: the glock
	84	*
	85	*/
	86
	87	static void gfs2_pte_inval(struct gfs2_glock *gl)
	88	{
	89	struct gfs2_inode *ip;
	90	struct inode *inode;
	91
	92	ip = gl->gl_object;
	93	inode = &ip->i_inode;
b60623c2	94	if (!ip \|\| !S_ISREG(inode->i_mode))
ba7f7290 SW	95	return;
	96
	97	if (!test_bit(GIF_PAGED, &ip->i_flags))
	98	return;
	99
	100	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
	101
	102	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
	103	set_bit(GLF_DIRTY, &gl->gl_flags);
	104
	105	clear_bit(GIF_SW_PAGED, &ip->i_flags);
	106	}
	107
b3b94faa DT	108	/**
	109	* meta_go_sync - sync out the metadata for this glock
	110	* @gl: the glock
b3b94faa DT	111	*
	112	* Called when demoting or unlocking an EX glock. We must flush
	113	* to disk all dirty buffers/pages relating to this glock, and must not
	114	* not return to caller to demote/unlock the glock until I/O is complete.
	115	*/
	116
1a14d3a6	117	static void meta_go_sync(struct gfs2_glock *gl)
b3b94faa	118	{
b5d32bea SW	119	if (gl->gl_state != LM_ST_EXCLUSIVE)
	120	return;
	121
b3b94faa	122	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	123	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0	124	gfs2_meta_sync(gl);
1a14d3a6	125	gfs2_ail_empty_gl(gl);
b3b94faa	126	}
b3b94faa DT	127	}
	128
	129	/**
	130	* meta_go_inval - invalidate the metadata for this glock
	131	* @gl: the glock
	132	* @flags:
	133	*
	134	*/
	135
	136	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	137	{
	138	if (!(flags & DIO_METADATA))
	139	return;
	140
	141	gfs2_meta_inval(gl);
	142	gl->gl_vn++;
	143	}
	144
b5d32bea SW	145	/**
	146	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	147	* @gl: the glock protecting the inode
	148	*
	149	*/
	150
	151	static void inode_go_sync(struct gfs2_glock *gl)
	152	{
	153	struct gfs2_inode *ip = gl->gl_object;
	154
	155	if (ip && !S_ISREG(ip->i_inode.i_mode))
	156	ip = NULL;
	157
	158	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
b5d32bea SW	159	if (ip)
b5d32bea SW	160	filemap_fdatawrite(ip->i_inode.i_mapping);
b524fe64	161	gfs2_log_flush(gl->gl_sbd, gl);
b5d32bea SW	162	gfs2_meta_sync(gl);
	163	if (ip) {
	164	struct address_space *mapping = ip->i_inode.i_mapping;
	165	int error = filemap_fdatawait(mapping);
3e9f45bd	166	mapping_set_error(mapping, error);
b5d32bea SW	167	}
	168	clear_bit(GLF_DIRTY, &gl->gl_flags);
	169	gfs2_ail_empty_gl(gl);
	170	}
	171	}
	172
b3b94faa DT	173	/**
	174	* inode_go_xmote_th - promote/demote a glock
	175	* @gl: the glock
	176	* @state: the requested state
	177	* @flags:
	178	*
	179	*/
	180
b5d32bea	181	static void inode_go_xmote_th(struct gfs2_glock *gl)
b3b94faa DT	182	{
	183	if (gl->gl_state != LM_ST_UNLOCKED)
	184	gfs2_pte_inval(gl);
b5d32bea SW	185	if (gl->gl_state == LM_ST_EXCLUSIVE)
b5d32bea SW	186	inode_go_sync(gl);
b3b94faa DT	187	}
	188
	189	/**
	190	* inode_go_xmote_bh - After promoting/demoting a glock
	191	* @gl: the glock
	192	*
	193	*/
	194
	195	static void inode_go_xmote_bh(struct gfs2_glock *gl)
	196	{
	197	struct gfs2_holder *gh = gl->gl_req_gh;
	198	struct buffer_head *bh;
	199	int error;
	200
	201	if (gl->gl_state != LM_ST_UNLOCKED &&
	202	(!gh \|\| !(gh->gh_flags & GL_SKIP))) {
7276b3b0	203	error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
b3b94faa DT	204	if (!error)
	205	brelse(bh);
	206	}
	207	}
	208
	209	/**
	210	* inode_go_drop_th - unlock a glock
	211	* @gl: the glock
	212	*
	213	* Invoked from rq_demote().
	214	* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
	215	* is being purged from our node's glock cache; we're dropping lock.
	216	*/
	217
	218	static void inode_go_drop_th(struct gfs2_glock *gl)
	219	{
	220	gfs2_pte_inval(gl);
b5d32bea SW	221	if (gl->gl_state == LM_ST_EXCLUSIVE)
b5d32bea SW	222	inode_go_sync(gl);
b3b94faa DT	223	}
	224
	225	/**
	226	* inode_go_inval - prepare a inode glock to be released
	227	* @gl: the glock
	228	* @flags:
	229	*
	230	*/
	231
	232	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	233	{
b004157a	234	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	235	int meta = (flags & DIO_METADATA);
b3b94faa DT	236
	237	if (meta) {
	238	gfs2_meta_inval(gl);
b004157a SW	239	if (ip)
	240	set_bit(GIF_INVALID, &ip->i_flags);
	241	}
	242
	243	if (ip && S_ISREG(ip->i_inode.i_mode)) {
	244	truncate_inode_pages(ip->i_inode.i_mapping, 0);
b004157a	245	clear_bit(GIF_PAGED, &ip->i_flags);
b3b94faa	246	}
b3b94faa DT	247	}
	248
	249	/**
	250	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	251	* @gl: the glock
	252	*
	253	* Returns: 1 if it's ok
	254	*/
	255
	256	static int inode_go_demote_ok(struct gfs2_glock *gl)
	257	{
	258	struct gfs2_sbd *sdp = gl->gl_sbd;
	259	int demote = 0;
	260
5c676f6d	261	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	262	demote = 1;
	263	else if (!sdp->sd_args.ar_localcaching &&
	264	time_after_eq(jiffies, gl->gl_stamp +
	265	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	266	demote = 1;
	267
	268	return demote;
	269	}
	270
	271	/**
	272	* inode_go_lock - operation done after an inode lock is locked by a process
	273	* @gl: the glock
	274	* @flags:
	275	*
	276	* Returns: errno
	277	*/
	278
	279	static int inode_go_lock(struct gfs2_holder *gh)
	280	{
	281	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	282	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	283	int error = 0;
	284
	285	if (!ip)
	286	return 0;
	287
bfded27b	288	if (test_bit(GIF_INVALID, &ip->i_flags)) {
b3b94faa DT	289	error = gfs2_inode_refresh(ip);
	290	if (error)
	291	return error;
b3b94faa DT	292	}
	293
	294	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	295	(gl->gl_state == LM_ST_EXCLUSIVE) &&
1c0f4872	296	(gh->gh_state == LM_ST_EXCLUSIVE))
b3b94faa DT	297	error = gfs2_truncatei_resume(ip);
	298
	299	return error;
	300	}
	301
	302	/**
	303	* inode_go_unlock - operation done before an inode lock is unlocked by a
	304	* process
	305	* @gl: the glock
	306	* @flags:
	307	*
	308	*/
	309
	310	static void inode_go_unlock(struct gfs2_holder *gh)
	311	{
	312	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	313	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	314
9e2dbdac SW	315	if (ip)
9e2dbdac SW	316	gfs2_meta_cache_flush(ip);
b3b94faa DT	317	}
b3b94faa DT	318
b3b94faa DT	319	/**
	320	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	321	* @gl: the glock
	322	*
	323	* Returns: 1 if it's ok
	324	*/
	325
	326	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	327	{
	328	return !gl->gl_aspace->i_mapping->nrpages;
	329	}
	330
	331	/**
	332	* rgrp_go_lock - operation done after an rgrp lock is locked by
	333	* a first holder on this node.
	334	* @gl: the glock
	335	* @flags:
	336	*
	337	* Returns: errno
	338	*/
	339
	340	static int rgrp_go_lock(struct gfs2_holder *gh)
	341	{
5c676f6d	342	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	343	}
	344
	345	/**
	346	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	347	* a last holder on this node.
	348	* @gl: the glock
	349	* @flags:
	350	*
	351	*/
	352
	353	static void rgrp_go_unlock(struct gfs2_holder *gh)
	354	{
5c676f6d	355	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	356	}
	357
	358	/**
	359	* trans_go_xmote_th - promote/demote the transaction glock
	360	* @gl: the glock
	361	* @state: the requested state
	362	* @flags:
	363	*
	364	*/
	365
b5d32bea	366	static void trans_go_xmote_th(struct gfs2_glock *gl)
b3b94faa DT	367	{
	368	struct gfs2_sbd *sdp = gl->gl_sbd;
	369
	370	if (gl->gl_state != LM_ST_UNLOCKED &&
	371	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	372	gfs2_meta_syncfs(sdp);
	373	gfs2_log_shutdown(sdp);
	374	}
b3b94faa DT	375	}
	376
	377	/**
	378	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	379	* @gl: the glock
	380	*
	381	*/
	382
	383	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	384	{
	385	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	386	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	387	struct gfs2_glock *j_gl = ip->i_gl;
55167622	388	struct gfs2_log_header_host head;
b3b94faa DT	389	int error;
	390
	391	if (gl->gl_state != LM_ST_UNLOCKED &&
	392	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
feaa7bba	393	gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
1a14d3a6	394	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
b3b94faa DT	395
	396	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	397	if (error)
	398	gfs2_consist(sdp);
	399	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	400	gfs2_consist(sdp);
	401
	402	/* Initialize some head of the log stuff */
	403	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	404	sdp->sd_log_sequence = head.lh_sequence + 1;
	405	gfs2_log_pointers_init(sdp, head.lh_blkno);
	406	}
	407	}
	408	}
	409
	410	/**
	411	* trans_go_drop_th - unlock the transaction glock
	412	* @gl: the glock
	413	*
	414	* We want to sync the device even with localcaching. Remember
	415	* that localcaching journal replay only marks buffers dirty.
	416	*/
	417
	418	static void trans_go_drop_th(struct gfs2_glock *gl)
	419	{
	420	struct gfs2_sbd *sdp = gl->gl_sbd;
	421
	422	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	423	gfs2_meta_syncfs(sdp);
	424	gfs2_log_shutdown(sdp);
	425	}
b3b94faa DT	426	}
	427
	428	/**
	429	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	430	* @gl: the glock
	431	*
	432	* Returns: 1 if it's ok
	433	*/
	434
	435	static int quota_go_demote_ok(struct gfs2_glock *gl)
	436	{
	437	return !atomic_read(&gl->gl_lvb_count);
	438	}
	439
8fb4b536	440	const struct gfs2_glock_operations gfs2_meta_glops = {
b5d32bea SW	441	.go_xmote_th = meta_go_sync,
b5d32bea SW	442	.go_drop_th = meta_go_sync,
ea67eedb	443	.go_type = LM_TYPE_META,
b3b94faa DT	444	};
b3b94faa DT	445
8fb4b536	446	const struct gfs2_glock_operations gfs2_inode_glops = {
b3b94faa DT	447	.go_xmote_th = inode_go_xmote_th,
	448	.go_xmote_bh = inode_go_xmote_bh,
	449	.go_drop_th = inode_go_drop_th,
b3b94faa DT	450	.go_inval = inode_go_inval,
	451	.go_demote_ok = inode_go_demote_ok,
	452	.go_lock = inode_go_lock,
	453	.go_unlock = inode_go_unlock,
ea67eedb	454	.go_type = LM_TYPE_INODE,
b3b94faa DT	455	};
b3b94faa DT	456
8fb4b536	457	const struct gfs2_glock_operations gfs2_rgrp_glops = {
cad5b939 SW	458	.go_xmote_th = meta_go_sync,
cad5b939 SW	459	.go_drop_th = meta_go_sync,
b3b94faa DT	460	.go_inval = meta_go_inval,
	461	.go_demote_ok = rgrp_go_demote_ok,
	462	.go_lock = rgrp_go_lock,
	463	.go_unlock = rgrp_go_unlock,
ea67eedb	464	.go_type = LM_TYPE_RGRP,
b3b94faa DT	465	};
b3b94faa DT	466
8fb4b536	467	const struct gfs2_glock_operations gfs2_trans_glops = {
b3b94faa DT	468	.go_xmote_th = trans_go_xmote_th,
	469	.go_xmote_bh = trans_go_xmote_bh,
	470	.go_drop_th = trans_go_drop_th,
ea67eedb	471	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	472	};
b3b94faa DT	473
8fb4b536	474	const struct gfs2_glock_operations gfs2_iopen_glops = {
ea67eedb	475	.go_type = LM_TYPE_IOPEN,
b3b94faa DT	476	};
b3b94faa DT	477
8fb4b536	478	const struct gfs2_glock_operations gfs2_flock_glops = {
ea67eedb	479	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	480	};
b3b94faa DT	481
8fb4b536	482	const struct gfs2_glock_operations gfs2_nondisk_glops = {
ea67eedb	483	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	484	};
b3b94faa DT	485
8fb4b536	486	const struct gfs2_glock_operations gfs2_quota_glops = {
b3b94faa	487	.go_demote_ok = quota_go_demote_ok,
ea67eedb	488	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	489	};
b3b94faa DT	490
8fb4b536	491	const struct gfs2_glock_operations gfs2_journal_glops = {
ea67eedb	492	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	493	};
b3b94faa DT	494