[GitHub/mt8127/android_kernel_alcatel_ttab.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 v.2.
 */

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

#include "gfs2.h"
#include "lm_interface.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "page.h"
#include "recovery.h"
#include "rgrp.h"
#include "util.h"

/**
 * meta_go_sync - sync out the metadata for this glock
 * @gl: the glock
 * @flags: DIO_*
 *
 * 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, int flags)
{
	if (!(flags & DIO_METADATA))
		return;

	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
		gfs2_log_flush(gl->gl_sbd, gl);
		gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
		if (flags & DIO_RELEASE)
			gfs2_ail_empty_gl(gl);
	}

	clear_bit(GLF_SYNC, &gl->gl_flags);
}

/**
 * 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++;
}

/**
 * meta_go_demote_ok - Check to see if it's ok to unlock a glock
 * @gl: the glock
 *
 * Returns: 1 if we have no cached data; ok to demote meta glock
 */

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

/**
 * 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, unsigned int state,
			      int flags)
{
	if (gl->gl_state != LM_ST_UNLOCKED)
		gfs2_pte_inval(gl);
	gfs2_glock_xmote_th(gl, state, flags);
}

/**
 * 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, DIO_START,
				       &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);
	gfs2_glock_drop_th(gl);
}

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

static void inode_go_sync(struct gfs2_glock *gl, int flags)
{
	int meta = (flags & DIO_METADATA);
	int data = (flags & DIO_DATA);

	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
		if (meta && data) {
			gfs2_page_sync(gl, flags | DIO_START);
			gfs2_log_flush(gl->gl_sbd, gl);
			gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
			gfs2_page_sync(gl, flags | DIO_WAIT);
			clear_bit(GLF_DIRTY, &gl->gl_flags);
		} else if (meta) {
			gfs2_log_flush(gl->gl_sbd, gl);
			gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
		} else if (data)
			gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
		if (flags & DIO_RELEASE)
			gfs2_ail_empty_gl(gl);
	}

	clear_bit(GLF_SYNC, &gl->gl_flags);
}

/**
 * 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)
{
	int meta = (flags & DIO_METADATA);
	int data = (flags & DIO_DATA);

	if (meta) {
		gfs2_meta_inval(gl);
		gl->gl_vn++;
	}
	if (data)
		gfs2_page_inval(gl);
}

/**
 * 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 (ip->i_vn != gl->gl_vn) {
		error = gfs2_inode_refresh(ip);
		if (error)
			return error;
		gfs2_inode_attr_in(ip);
	}

	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	    (gl->gl_state == LM_ST_EXCLUSIVE) &&
	    (gh->gh_flags & GL_LOCAL_EXCL))
		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 && test_bit(GLF_DIRTY, &gl->gl_flags))
		gfs2_inode_attr_in(ip);

	if (ip)
		gfs2_meta_cache_flush(ip);
}

/**
 * inode_greedy -
 * @gl: the glock
 *
 */

static void inode_greedy(struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;
	struct gfs2_inode *ip = gl->gl_object;
	unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
	unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
	unsigned int new_time;

	spin_lock(&ip->i_spin);

	if (time_after(ip->i_last_pfault + quantum, jiffies)) {
		new_time = ip->i_greedy + quantum;
		if (new_time > max)
			new_time = max;
	} else {
		new_time = ip->i_greedy - quantum;
		if (!new_time || new_time > max)
			new_time = 1;
	}

	ip->i_greedy = new_time;

	spin_unlock(&ip->i_spin);

	iput(&ip->i_inode);
}

/**
 * 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, unsigned int state,
			      int flags)
{
	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);
	}

	gfs2_glock_xmote_th(gl, state, flags);
}

/**
 * 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 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 | DIO_DATA);

		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);
	}

	gfs2_glock_drop_th(gl);
}

/**
 * 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);
}

struct gfs2_glock_operations gfs2_meta_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_sync = meta_go_sync,
	.go_inval = meta_go_inval,
	.go_demote_ok = meta_go_demote_ok,
	.go_type = LM_TYPE_META
};

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_sync = inode_go_sync,
	.go_inval = inode_go_inval,
	.go_demote_ok = inode_go_demote_ok,
	.go_lock = inode_go_lock,
	.go_unlock = inode_go_unlock,
	.go_greedy = inode_greedy,
	.go_type = LM_TYPE_INODE
};

struct gfs2_glock_operations gfs2_rgrp_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_sync = 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
};

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
};

struct gfs2_glock_operations gfs2_iopen_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_callback = gfs2_iopen_go_callback,
	.go_type = LM_TYPE_IOPEN
};

struct gfs2_glock_operations gfs2_flock_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_type = LM_TYPE_FLOCK
};

struct gfs2_glock_operations gfs2_nondisk_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_type = LM_TYPE_NONDISK
};

struct gfs2_glock_operations gfs2_quota_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_demote_ok = quota_go_demote_ok,
	.go_type = LM_TYPE_QUOTA
};

struct gfs2_glock_operations gfs2_journal_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.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
	7	* of the GNU General Public License v.2.
	8	*/
	9
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/completion.h>
	14	#include <linux/buffer_head.h>
5c676f6d	15	#include <linux/gfs2_ondisk.h>
b3b94faa DT	16
b3b94faa DT	17	#include "gfs2.h"
5c676f6d SW	18	#include "lm_interface.h"
5c676f6d SW	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"
	26	#include "page.h"
	27	#include "recovery.h"
	28	#include "rgrp.h"
5c676f6d	29	#include "util.h"
b3b94faa DT	30
	31	/**
	32	* meta_go_sync - sync out the metadata for this glock
	33	* @gl: the glock
	34	* @flags: DIO_*
	35	*
	36	* Called when demoting or unlocking an EX glock. We must flush
	37	* to disk all dirty buffers/pages relating to this glock, and must not
	38	* not return to caller to demote/unlock the glock until I/O is complete.
	39	*/
	40
	41	static void meta_go_sync(struct gfs2_glock *gl, int flags)
	42	{
	43	if (!(flags & DIO_METADATA))
	44	return;
	45
	46	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	47	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	48	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	49	if (flags & DIO_RELEASE)
	50	gfs2_ail_empty_gl(gl);
	51	}
	52
	53	clear_bit(GLF_SYNC, &gl->gl_flags);
	54	}
	55
	56	/**
	57	* meta_go_inval - invalidate the metadata for this glock
	58	* @gl: the glock
	59	* @flags:
	60	*
	61	*/
	62
	63	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	64	{
	65	if (!(flags & DIO_METADATA))
	66	return;
	67
	68	gfs2_meta_inval(gl);
	69	gl->gl_vn++;
	70	}
	71
	72	/**
	73	* meta_go_demote_ok - Check to see if it's ok to unlock a glock
	74	* @gl: the glock
	75	*
	76	* Returns: 1 if we have no cached data; ok to demote meta glock
	77	*/
	78
	79	static int meta_go_demote_ok(struct gfs2_glock *gl)
	80	{
	81	return !gl->gl_aspace->i_mapping->nrpages;
	82	}
	83
	84	/**
	85	* inode_go_xmote_th - promote/demote a glock
	86	* @gl: the glock
	87	* @state: the requested state
	88	* @flags:
	89	*
	90	*/
	91
	92	static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	93	int flags)
	94	{
	95	if (gl->gl_state != LM_ST_UNLOCKED)
	96	gfs2_pte_inval(gl);
	97	gfs2_glock_xmote_th(gl, state, flags);
	98	}
	99
	100	/**
	101	* inode_go_xmote_bh - After promoting/demoting a glock
	102	* @gl: the glock
	103	*
	104	*/
	105
	106	static void inode_go_xmote_bh(struct gfs2_glock *gl)
	107	{
	108	struct gfs2_holder *gh = gl->gl_req_gh;
	109	struct buffer_head *bh;
	110	int error;
	111
112	if (gl->gl_state != LM_ST_UNLOCKED &&
113	(!gh \|\| !(gh->gh_flags & GL_SKIP))) {
114	error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
115	&bh);
116	if (!error)
117	brelse(bh);
118	}
119	}
120
121	/**
122	* inode_go_drop_th - unlock a glock
123	* @gl: the glock
124	*
125	* Invoked from rq_demote().
126	* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
127	* is being purged from our node's glock cache; we're dropping lock.
128	*/
129
130	static void inode_go_drop_th(struct gfs2_glock *gl)
131	{
132	gfs2_pte_inval(gl);
133	gfs2_glock_drop_th(gl);
134	}
135
136	/**
137	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
138	* @gl: the glock protecting the inode
139	* @flags:
140	*
141	*/
142
143	static void inode_go_sync(struct gfs2_glock *gl, int flags)
144	{
145	int meta = (flags & DIO_METADATA);
146	int data = (flags & DIO_DATA);
147
148	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
149	if (meta && data) {
150	gfs2_page_sync(gl, flags \| DIO_START);
b09e593d	151	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	152	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	153	gfs2_page_sync(gl, flags \| DIO_WAIT);
	154	clear_bit(GLF_DIRTY, &gl->gl_flags);
	155	} else if (meta) {
b09e593d	156	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	157	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	158	} else if (data)
	159	gfs2_page_sync(gl, flags \| DIO_START \| DIO_WAIT);
	160	if (flags & DIO_RELEASE)
	161	gfs2_ail_empty_gl(gl);
	162	}
	163
	164	clear_bit(GLF_SYNC, &gl->gl_flags);
	165	}
	166
	167	/**
	168	* inode_go_inval - prepare a inode glock to be released
	169	* @gl: the glock
	170	* @flags:
	171	*
	172	*/
	173
	174	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	175	{
	176	int meta = (flags & DIO_METADATA);
	177	int data = (flags & DIO_DATA);
	178
	179	if (meta) {
	180	gfs2_meta_inval(gl);
	181	gl->gl_vn++;
	182	}
	183	if (data)
	184	gfs2_page_inval(gl);
	185	}
	186
	187	/**
	188	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	189	* @gl: the glock
	190	*
	191	* Returns: 1 if it's ok
	192	*/
	193
	194	static int inode_go_demote_ok(struct gfs2_glock *gl)
	195	{
	196	struct gfs2_sbd *sdp = gl->gl_sbd;
	197	int demote = 0;
	198
5c676f6d	199	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	200	demote = 1;
	201	else if (!sdp->sd_args.ar_localcaching &&
	202	time_after_eq(jiffies, gl->gl_stamp +
	203	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	204	demote = 1;
	205
	206	return demote;
	207	}
	208
	209	/**
	210	* inode_go_lock - operation done after an inode lock is locked by a process
	211	* @gl: the glock
	212	* @flags:
	213	*
	214	* Returns: errno
	215	*/
	216
	217	static int inode_go_lock(struct gfs2_holder *gh)
	218	{
	219	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	220	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	221	int error = 0;
	222
	223	if (!ip)
	224	return 0;
	225
	226	if (ip->i_vn != gl->gl_vn) {
	227	error = gfs2_inode_refresh(ip);
	228	if (error)
	229	return error;
	230	gfs2_inode_attr_in(ip);
	231	}
	232
	233	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	234	(gl->gl_state == LM_ST_EXCLUSIVE) &&
	235	(gh->gh_flags & GL_LOCAL_EXCL))
	236	error = gfs2_truncatei_resume(ip);
	237
	238	return error;
	239	}
	240
	241	/**
	242	* inode_go_unlock - operation done before an inode lock is unlocked by a
	243	* process
	244	* @gl: the glock
	245	* @flags:
	246	*
	247	*/
	248
	249	static void inode_go_unlock(struct gfs2_holder *gh)
	250	{
	251	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	252	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	253
	254	if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
	255	gfs2_inode_attr_in(ip);
	256
	257	if (ip)
	258	gfs2_meta_cache_flush(ip);
	259	}
	260
	261	/**
	262	* inode_greedy -
	263	* @gl: the glock
	264	*
	265	*/
	266
	267	static void inode_greedy(struct gfs2_glock *gl)
	268	{
	269	struct gfs2_sbd *sdp = gl->gl_sbd;
5c676f6d	270	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	271	unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
	272	unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
	273	unsigned int new_time;
	274
	275	spin_lock(&ip->i_spin);
	276
	277	if (time_after(ip->i_last_pfault + quantum, jiffies)) {
	278	new_time = ip->i_greedy + quantum;
	279	if (new_time > max)
	280	new_time = max;
	281	} else {
	282	new_time = ip->i_greedy - quantum;
	283	if (!new_time \|\| new_time > max)
	284	new_time = 1;
	285	}
	286
	287	ip->i_greedy = new_time;
	288
	289	spin_unlock(&ip->i_spin);
	290
feaa7bba	291	iput(&ip->i_inode);
b3b94faa DT	292	}
	293
	294	/**
	295	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	296	* @gl: the glock
	297	*
	298	* Returns: 1 if it's ok
	299	*/
	300
	301	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	302	{
	303	return !gl->gl_aspace->i_mapping->nrpages;
	304	}
	305
	306	/**
	307	* rgrp_go_lock - operation done after an rgrp lock is locked by
	308	* a first holder on this node.
	309	* @gl: the glock
	310	* @flags:
	311	*
	312	* Returns: errno
	313	*/
	314
	315	static int rgrp_go_lock(struct gfs2_holder *gh)
	316	{
5c676f6d	317	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	318	}
	319
	320	/**
	321	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	322	* a last holder on this node.
	323	* @gl: the glock
	324	* @flags:
	325	*
	326	*/
	327
	328	static void rgrp_go_unlock(struct gfs2_holder *gh)
	329	{
5c676f6d	330	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	331	}
	332
	333	/**
	334	* trans_go_xmote_th - promote/demote the transaction glock
	335	* @gl: the glock
	336	* @state: the requested state
	337	* @flags:
	338	*
	339	*/
	340
	341	static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	342	int flags)
	343	{
	344	struct gfs2_sbd *sdp = gl->gl_sbd;
	345
	346	if (gl->gl_state != LM_ST_UNLOCKED &&
	347	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	348	gfs2_meta_syncfs(sdp);
	349	gfs2_log_shutdown(sdp);
	350	}
	351
	352	gfs2_glock_xmote_th(gl, state, flags);
	353	}
	354
	355	/**
	356	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	357	* @gl: the glock
	358	*
	359	*/
	360
	361	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	362	{
	363	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	364	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	365	struct gfs2_glock *j_gl = ip->i_gl;
b3b94faa DT	366	struct gfs2_log_header head;
	367	int error;
	368
	369	if (gl->gl_state != LM_ST_UNLOCKED &&
	370	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
feaa7bba	371	gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
b3b94faa DT	372	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA \| DIO_DATA);
	373
	374	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	375	if (error)
	376	gfs2_consist(sdp);
	377	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	378	gfs2_consist(sdp);
	379
	380	/* Initialize some head of the log stuff */
	381	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	382	sdp->sd_log_sequence = head.lh_sequence + 1;
	383	gfs2_log_pointers_init(sdp, head.lh_blkno);
	384	}
	385	}
	386	}
	387
	388	/**
	389	* trans_go_drop_th - unlock the transaction glock
	390	* @gl: the glock
	391	*
	392	* We want to sync the device even with localcaching. Remember
	393	* that localcaching journal replay only marks buffers dirty.
	394	*/
	395
	396	static void trans_go_drop_th(struct gfs2_glock *gl)
	397	{
	398	struct gfs2_sbd *sdp = gl->gl_sbd;
	399
	400	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	401	gfs2_meta_syncfs(sdp);
	402	gfs2_log_shutdown(sdp);
	403	}
	404
	405	gfs2_glock_drop_th(gl);
	406	}
	407
	408	/**
	409	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	410	* @gl: the glock
	411	*
	412	* Returns: 1 if it's ok
	413	*/
	414
	415	static int quota_go_demote_ok(struct gfs2_glock *gl)
	416	{
	417	return !atomic_read(&gl->gl_lvb_count);
	418	}
	419
	420	struct gfs2_glock_operations gfs2_meta_glops = {
	421	.go_xmote_th = gfs2_glock_xmote_th,
	422	.go_drop_th = gfs2_glock_drop_th,
	423	.go_sync = meta_go_sync,
	424	.go_inval = meta_go_inval,
	425	.go_demote_ok = meta_go_demote_ok,
	426	.go_type = LM_TYPE_META
	427	};
	428
	429	struct gfs2_glock_operations gfs2_inode_glops = {
	430	.go_xmote_th = inode_go_xmote_th,
	431	.go_xmote_bh = inode_go_xmote_bh,
	432	.go_drop_th = inode_go_drop_th,
	433	.go_sync = inode_go_sync,
	434	.go_inval = inode_go_inval,
	435	.go_demote_ok = inode_go_demote_ok,
436	.go_lock = inode_go_lock,
437	.go_unlock = inode_go_unlock,
438	.go_greedy = inode_greedy,
439	.go_type = LM_TYPE_INODE
440	};
441
442	struct gfs2_glock_operations gfs2_rgrp_glops = {
443	.go_xmote_th = gfs2_glock_xmote_th,
444	.go_drop_th = gfs2_glock_drop_th,
445	.go_sync = meta_go_sync,
446	.go_inval = meta_go_inval,
447	.go_demote_ok = rgrp_go_demote_ok,
448	.go_lock = rgrp_go_lock,
449	.go_unlock = rgrp_go_unlock,
450	.go_type = LM_TYPE_RGRP
451	};
452
453	struct gfs2_glock_operations gfs2_trans_glops = {
454	.go_xmote_th = trans_go_xmote_th,
455	.go_xmote_bh = trans_go_xmote_bh,
456	.go_drop_th = trans_go_drop_th,
457	.go_type = LM_TYPE_NONDISK
458	};
459
460	struct gfs2_glock_operations gfs2_iopen_glops = {
461	.go_xmote_th = gfs2_glock_xmote_th,
462	.go_drop_th = gfs2_glock_drop_th,
463	.go_callback = gfs2_iopen_go_callback,
464	.go_type = LM_TYPE_IOPEN
465	};
466
467	struct gfs2_glock_operations gfs2_flock_glops = {
468	.go_xmote_th = gfs2_glock_xmote_th,
469	.go_drop_th = gfs2_glock_drop_th,
470	.go_type = LM_TYPE_FLOCK
471	};
472
473	struct gfs2_glock_operations gfs2_nondisk_glops = {
474	.go_xmote_th = gfs2_glock_xmote_th,
475	.go_drop_th = gfs2_glock_drop_th,
476	.go_type = LM_TYPE_NONDISK
477	};
478
479	struct gfs2_glock_operations gfs2_quota_glops = {
480	.go_xmote_th = gfs2_glock_xmote_th,
481	.go_drop_th = gfs2_glock_drop_th,
482	.go_demote_ok = quota_go_demote_ok,
483	.go_type = LM_TYPE_QUOTA
484	};
485
486	struct gfs2_glock_operations gfs2_journal_glops = {
487	.go_xmote_th = gfs2_glock_xmote_th,
488	.go_drop_th = gfs2_glock_drop_th,
489	.go_type = LM_TYPE_JOURNAL
490	};
491