[mirror_ubuntu-jammy-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 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)
{
	printk(KERN_INFO "drop th %p\n", gl->gl_object);
	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) {
			printk(KERN_INFO "sync all\n");
			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) {
		printk(KERN_INFO "refresh inode %p\n", &ip->i_inode);
		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	{
feaa7bba	132	printk(KERN_INFO "drop th %p\n", gl->gl_object);
b3b94faa DT	133	gfs2_pte_inval(gl);
	134	gfs2_glock_drop_th(gl);
	135	}
	136
	137	/**
	138	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	139	* @gl: the glock protecting the inode
	140	* @flags:
	141	*
	142	*/
	143
	144	static void inode_go_sync(struct gfs2_glock *gl, int flags)
	145	{
	146	int meta = (flags & DIO_METADATA);
	147	int data = (flags & DIO_DATA);
	148
	149	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
	150	if (meta && data) {
feaa7bba	151	printk(KERN_INFO "sync all\n");
b3b94faa	152	gfs2_page_sync(gl, flags \| DIO_START);
b09e593d	153	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	154	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	155	gfs2_page_sync(gl, flags \| DIO_WAIT);
	156	clear_bit(GLF_DIRTY, &gl->gl_flags);
	157	} else if (meta) {
b09e593d	158	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	159	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	160	} else if (data)
	161	gfs2_page_sync(gl, flags \| DIO_START \| DIO_WAIT);
	162	if (flags & DIO_RELEASE)
	163	gfs2_ail_empty_gl(gl);
	164	}
	165
	166	clear_bit(GLF_SYNC, &gl->gl_flags);
	167	}
	168
	169	/**
	170	* inode_go_inval - prepare a inode glock to be released
	171	* @gl: the glock
	172	* @flags:
	173	*
	174	*/
	175
	176	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	177	{
	178	int meta = (flags & DIO_METADATA);
	179	int data = (flags & DIO_DATA);
	180
	181	if (meta) {
	182	gfs2_meta_inval(gl);
	183	gl->gl_vn++;
	184	}
	185	if (data)
	186	gfs2_page_inval(gl);
	187	}
	188
	189	/**
	190	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	191	* @gl: the glock
	192	*
	193	* Returns: 1 if it's ok
	194	*/
	195
	196	static int inode_go_demote_ok(struct gfs2_glock *gl)
	197	{
	198	struct gfs2_sbd *sdp = gl->gl_sbd;
	199	int demote = 0;
	200
5c676f6d	201	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	202	demote = 1;
	203	else if (!sdp->sd_args.ar_localcaching &&
	204	time_after_eq(jiffies, gl->gl_stamp +
	205	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	206	demote = 1;
	207
	208	return demote;
	209	}
	210
	211	/**
	212	* inode_go_lock - operation done after an inode lock is locked by a process
	213	* @gl: the glock
	214	* @flags:
	215	*
	216	* Returns: errno
	217	*/
	218
	219	static int inode_go_lock(struct gfs2_holder *gh)
	220	{
	221	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	222	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	223	int error = 0;
	224
	225	if (!ip)
	226	return 0;
	227
	228	if (ip->i_vn != gl->gl_vn) {
feaa7bba	229	printk(KERN_INFO "refresh inode %p\n", &ip->i_inode);
b3b94faa DT	230	error = gfs2_inode_refresh(ip);
	231	if (error)
	232	return error;
	233	gfs2_inode_attr_in(ip);
	234	}
	235
	236	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	237	(gl->gl_state == LM_ST_EXCLUSIVE) &&
	238	(gh->gh_flags & GL_LOCAL_EXCL))
	239	error = gfs2_truncatei_resume(ip);
	240
	241	return error;
	242	}
	243
	244	/**
	245	* inode_go_unlock - operation done before an inode lock is unlocked by a
	246	* process
	247	* @gl: the glock
	248	* @flags:
	249	*
	250	*/
	251
	252	static void inode_go_unlock(struct gfs2_holder *gh)
	253	{
	254	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	255	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	256
	257	if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
	258	gfs2_inode_attr_in(ip);
	259
	260	if (ip)
	261	gfs2_meta_cache_flush(ip);
	262	}
	263
	264	/**
	265	* inode_greedy -
	266	* @gl: the glock
	267	*
	268	*/
	269
	270	static void inode_greedy(struct gfs2_glock *gl)
	271	{
	272	struct gfs2_sbd *sdp = gl->gl_sbd;
5c676f6d	273	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	274	unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
	275	unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
	276	unsigned int new_time;
	277
	278	spin_lock(&ip->i_spin);
	279
	280	if (time_after(ip->i_last_pfault + quantum, jiffies)) {
	281	new_time = ip->i_greedy + quantum;
	282	if (new_time > max)
	283	new_time = max;
	284	} else {
	285	new_time = ip->i_greedy - quantum;
	286	if (!new_time \|\| new_time > max)
	287	new_time = 1;
	288	}
	289
	290	ip->i_greedy = new_time;
	291
	292	spin_unlock(&ip->i_spin);
	293
feaa7bba	294	iput(&ip->i_inode);
b3b94faa DT	295	}
	296
	297	/**
	298	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	299	* @gl: the glock
	300	*
	301	* Returns: 1 if it's ok
	302	*/
	303
	304	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	305	{
	306	return !gl->gl_aspace->i_mapping->nrpages;
	307	}
	308
	309	/**
	310	* rgrp_go_lock - operation done after an rgrp lock is locked by
	311	* a first holder on this node.
	312	* @gl: the glock
	313	* @flags:
	314	*
	315	* Returns: errno
	316	*/
	317
	318	static int rgrp_go_lock(struct gfs2_holder *gh)
	319	{
5c676f6d	320	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	321	}
	322
	323	/**
	324	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	325	* a last holder on this node.
	326	* @gl: the glock
	327	* @flags:
	328	*
	329	*/
	330
	331	static void rgrp_go_unlock(struct gfs2_holder *gh)
	332	{
5c676f6d	333	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	334	}
	335
	336	/**
	337	* trans_go_xmote_th - promote/demote the transaction glock
	338	* @gl: the glock
	339	* @state: the requested state
	340	* @flags:
	341	*
	342	*/
	343
	344	static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	345	int flags)
	346	{
	347	struct gfs2_sbd *sdp = gl->gl_sbd;
	348
	349	if (gl->gl_state != LM_ST_UNLOCKED &&
	350	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	351	gfs2_meta_syncfs(sdp);
	352	gfs2_log_shutdown(sdp);
	353	}
	354
	355	gfs2_glock_xmote_th(gl, state, flags);
	356	}
	357
	358	/**
	359	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	360	* @gl: the glock
	361	*
	362	*/
	363
	364	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	365	{
	366	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	367	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	368	struct gfs2_glock *j_gl = ip->i_gl;
b3b94faa DT	369	struct gfs2_log_header head;
	370	int error;
	371
	372	if (gl->gl_state != LM_ST_UNLOCKED &&
	373	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
feaa7bba	374	gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
b3b94faa DT	375	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA \| DIO_DATA);
	376
	377	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	378	if (error)
	379	gfs2_consist(sdp);
	380	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	381	gfs2_consist(sdp);
	382
	383	/* Initialize some head of the log stuff */
	384	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	385	sdp->sd_log_sequence = head.lh_sequence + 1;
	386	gfs2_log_pointers_init(sdp, head.lh_blkno);
	387	}
	388	}
	389	}
	390
	391	/**
	392	* trans_go_drop_th - unlock the transaction glock
	393	* @gl: the glock
	394	*
	395	* We want to sync the device even with localcaching. Remember
	396	* that localcaching journal replay only marks buffers dirty.
	397	*/
	398
	399	static void trans_go_drop_th(struct gfs2_glock *gl)
	400	{
	401	struct gfs2_sbd *sdp = gl->gl_sbd;
	402
	403	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	404	gfs2_meta_syncfs(sdp);
	405	gfs2_log_shutdown(sdp);
	406	}
	407
	408	gfs2_glock_drop_th(gl);
	409	}
	410
	411	/**
	412	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	413	* @gl: the glock
	414	*
	415	* Returns: 1 if it's ok
	416	*/
	417
	418	static int quota_go_demote_ok(struct gfs2_glock *gl)
	419	{
	420	return !atomic_read(&gl->gl_lvb_count);
	421	}
	422
	423	struct gfs2_glock_operations gfs2_meta_glops = {
	424	.go_xmote_th = gfs2_glock_xmote_th,
	425	.go_drop_th = gfs2_glock_drop_th,
	426	.go_sync = meta_go_sync,
	427	.go_inval = meta_go_inval,
	428	.go_demote_ok = meta_go_demote_ok,
	429	.go_type = LM_TYPE_META
	430	};
	431
	432	struct gfs2_glock_operations gfs2_inode_glops = {
	433	.go_xmote_th = inode_go_xmote_th,
	434	.go_xmote_bh = inode_go_xmote_bh,
	435	.go_drop_th = inode_go_drop_th,
	436	.go_sync = inode_go_sync,
	437	.go_inval = inode_go_inval,
	438	.go_demote_ok = inode_go_demote_ok,
439	.go_lock = inode_go_lock,
440	.go_unlock = inode_go_unlock,
441	.go_greedy = inode_greedy,
442	.go_type = LM_TYPE_INODE
443	};
444
445	struct gfs2_glock_operations gfs2_rgrp_glops = {
446	.go_xmote_th = gfs2_glock_xmote_th,
447	.go_drop_th = gfs2_glock_drop_th,
448	.go_sync = meta_go_sync,
449	.go_inval = meta_go_inval,
450	.go_demote_ok = rgrp_go_demote_ok,
451	.go_lock = rgrp_go_lock,
452	.go_unlock = rgrp_go_unlock,
453	.go_type = LM_TYPE_RGRP
454	};
455
456	struct gfs2_glock_operations gfs2_trans_glops = {
457	.go_xmote_th = trans_go_xmote_th,
458	.go_xmote_bh = trans_go_xmote_bh,
459	.go_drop_th = trans_go_drop_th,
460	.go_type = LM_TYPE_NONDISK
461	};
462
463	struct gfs2_glock_operations gfs2_iopen_glops = {
464	.go_xmote_th = gfs2_glock_xmote_th,
465	.go_drop_th = gfs2_glock_drop_th,
466	.go_callback = gfs2_iopen_go_callback,
467	.go_type = LM_TYPE_IOPEN
468	};
469
470	struct gfs2_glock_operations gfs2_flock_glops = {
471	.go_xmote_th = gfs2_glock_xmote_th,
472	.go_drop_th = gfs2_glock_drop_th,
473	.go_type = LM_TYPE_FLOCK
474	};
475
476	struct gfs2_glock_operations gfs2_nondisk_glops = {
477	.go_xmote_th = gfs2_glock_xmote_th,
478	.go_drop_th = gfs2_glock_drop_th,
479	.go_type = LM_TYPE_NONDISK
480	};
481
482	struct gfs2_glock_operations gfs2_quota_glops = {
483	.go_xmote_th = gfs2_glock_xmote_th,
484	.go_drop_th = gfs2_glock_drop_th,
485	.go_demote_ok = quota_go_demote_ok,
486	.go_type = LM_TYPE_QUOTA
487	};
488
489	struct gfs2_glock_operations gfs2_journal_glops = {
490	.go_xmote_th = gfs2_glock_xmote_th,
491	.go_drop_th = gfs2_glock_drop_th,
492	.go_type = LM_TYPE_JOURNAL
493	};
494