[net-next-2.6.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/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 "recovery.h"
#include "rgrp.h"
#include "util.h"


/**
 * 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(ip->i_di.di_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);
}

/**
 * gfs2_page_inval - Invalidate all pages associated with a glock
 * @gl: the glock
 *
 */

static void gfs2_page_inval(struct gfs2_glock *gl)
{
	struct gfs2_inode *ip;
	struct inode *inode;

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

	truncate_inode_pages(inode->i_mapping, 0);
	gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !inode->i_mapping->nrpages);
	clear_bit(GIF_PAGED, &ip->i_flags);
}

/**
 * gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
 * @gl: the glock
 * @flags: DIO_START | DIO_WAIT
 *
 * Syncs data (not metadata) for a regular file.
 * No-op for all other types.
 */

static void gfs2_page_sync(struct gfs2_glock *gl, int flags)
{
	struct gfs2_inode *ip;
	struct inode *inode;
	struct address_space *mapping;
	int error = 0;

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

	mapping = inode->i_mapping;

	if (flags & DIO_START)
		filemap_fdatawrite(mapping);
	if (!error && (flags & DIO_WAIT))
		error = filemap_fdatawait(mapping);

	/* Put back any errors cleared by filemap_fdatawait()
	   so they can be caught by someone who can pass them
	   up to user space. */

	if (error == -ENOSPC)
		set_bit(AS_ENOSPC, &mapping->flags);
	else if (error)
		set_bit(AS_EIO, &mapping->flags);

}

/**
 * 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);
	}

}

/**
 * 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_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);
	}

}

/**
 * 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) {
		if (test_bit(GLF_DIRTY, &gl->gl_flags))
			gfs2_inode_attr_in(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);
}

const struct gfs2_glock_operations gfs2_meta_glops = {
	.go_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.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_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
};

const 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
};

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_xmote_th = gfs2_glock_xmote_th,
	.go_drop_th = gfs2_glock_drop_th,
	.go_callback = gfs2_iopen_go_callback,
	.go_type = LM_TYPE_IOPEN
};

const 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
};

const 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
};

const 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
};

const 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
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	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"
b3b94faa DT	26	#include "recovery.h"
b3b94faa DT	27	#include "rgrp.h"
5c676f6d	28	#include "util.h"
b3b94faa	29
ba7f7290 SW	30
	31	/**
	32	* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
	33	* @gl: the glock
	34	*
	35	*/
	36
	37	static void gfs2_pte_inval(struct gfs2_glock *gl)
	38	{
	39	struct gfs2_inode *ip;
	40	struct inode *inode;
	41
	42	ip = gl->gl_object;
	43	inode = &ip->i_inode;
	44	if (!ip \|\| !S_ISREG(ip->i_di.di_mode))
	45	return;
	46
	47	if (!test_bit(GIF_PAGED, &ip->i_flags))
	48	return;
	49
	50	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
	51
	52	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
	53	set_bit(GLF_DIRTY, &gl->gl_flags);
	54
	55	clear_bit(GIF_SW_PAGED, &ip->i_flags);
	56	}
	57
	58	/**
	59	* gfs2_page_inval - Invalidate all pages associated with a glock
	60	* @gl: the glock
	61	*
	62	*/
	63
	64	static void gfs2_page_inval(struct gfs2_glock *gl)
	65	{
	66	struct gfs2_inode *ip;
	67	struct inode *inode;
	68
	69	ip = gl->gl_object;
	70	inode = &ip->i_inode;
	71	if (!ip \|\| !S_ISREG(ip->i_di.di_mode))
	72	return;
	73
	74	truncate_inode_pages(inode->i_mapping, 0);
	75	gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !inode->i_mapping->nrpages);
	76	clear_bit(GIF_PAGED, &ip->i_flags);
	77	}
	78
	79	/**
	80	* gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
	81	* @gl: the glock
	82	* @flags: DIO_START \| DIO_WAIT
	83	*
	84	* Syncs data (not metadata) for a regular file.
	85	* No-op for all other types.
	86	*/
	87
	88	static void gfs2_page_sync(struct gfs2_glock *gl, int flags)
	89	{
	90	struct gfs2_inode *ip;
	91	struct inode *inode;
	92	struct address_space *mapping;
	93	int error = 0;
94
95	ip = gl->gl_object;
96	inode = &ip->i_inode;
97	if (!ip \|\| !S_ISREG(ip->i_di.di_mode))
98	return;
99
100	mapping = inode->i_mapping;
101
102	if (flags & DIO_START)
103	filemap_fdatawrite(mapping);
104	if (!error && (flags & DIO_WAIT))
105	error = filemap_fdatawait(mapping);
106
107	/* Put back any errors cleared by filemap_fdatawait()
108	so they can be caught by someone who can pass them
109	up to user space. */
110
111	if (error == -ENOSPC)
112	set_bit(AS_ENOSPC, &mapping->flags);
113	else if (error)
114	set_bit(AS_EIO, &mapping->flags);
115
116	}
117
b3b94faa DT	118	/**
	119	* meta_go_sync - sync out the metadata for this glock
	120	* @gl: the glock
	121	* @flags: DIO_*
	122	*
	123	* Called when demoting or unlocking an EX glock. We must flush
	124	* to disk all dirty buffers/pages relating to this glock, and must not
	125	* not return to caller to demote/unlock the glock until I/O is complete.
	126	*/
	127
	128	static void meta_go_sync(struct gfs2_glock *gl, int flags)
	129	{
	130	if (!(flags & DIO_METADATA))
	131	return;
	132
	133	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	134	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	135	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	136	if (flags & DIO_RELEASE)
	137	gfs2_ail_empty_gl(gl);
	138	}
	139
b3b94faa DT	140	}
	141
	142	/**
	143	* meta_go_inval - invalidate the metadata for this glock
	144	* @gl: the glock
	145	* @flags:
	146	*
	147	*/
	148
	149	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	150	{
	151	if (!(flags & DIO_METADATA))
	152	return;
	153
	154	gfs2_meta_inval(gl);
	155	gl->gl_vn++;
	156	}
	157
b3b94faa DT	158	/**
	159	* inode_go_xmote_th - promote/demote a glock
	160	* @gl: the glock
	161	* @state: the requested state
	162	* @flags:
	163	*
	164	*/
	165
	166	static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	167	int flags)
	168	{
	169	if (gl->gl_state != LM_ST_UNLOCKED)
	170	gfs2_pte_inval(gl);
	171	gfs2_glock_xmote_th(gl, state, flags);
	172	}
	173
	174	/**
	175	* inode_go_xmote_bh - After promoting/demoting a glock
	176	* @gl: the glock
	177	*
	178	*/
	179
	180	static void inode_go_xmote_bh(struct gfs2_glock *gl)
	181	{
	182	struct gfs2_holder *gh = gl->gl_req_gh;
	183	struct buffer_head *bh;
	184	int error;
	185
	186	if (gl->gl_state != LM_ST_UNLOCKED &&
	187	(!gh \|\| !(gh->gh_flags & GL_SKIP))) {
	188	error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
	189	&bh);
	190	if (!error)
	191	brelse(bh);
	192	}
	193	}
	194
	195	/**
	196	* inode_go_drop_th - unlock a glock
	197	* @gl: the glock
	198	*
	199	* Invoked from rq_demote().
	200	* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
	201	* is being purged from our node's glock cache; we're dropping lock.
	202	*/
	203
	204	static void inode_go_drop_th(struct gfs2_glock *gl)
	205	{
	206	gfs2_pte_inval(gl);
	207	gfs2_glock_drop_th(gl);
	208	}
	209
	210	/**
	211	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	212	* @gl: the glock protecting the inode
	213	* @flags:
	214	*
	215	*/
	216
	217	static void inode_go_sync(struct gfs2_glock *gl, int flags)
	218	{
	219	int meta = (flags & DIO_METADATA);
	220	int data = (flags & DIO_DATA);
	221
222	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
223	if (meta && data) {
224	gfs2_page_sync(gl, flags \| DIO_START);
b09e593d	225	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	226	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	227	gfs2_page_sync(gl, flags \| DIO_WAIT);
	228	clear_bit(GLF_DIRTY, &gl->gl_flags);
	229	} else if (meta) {
b09e593d	230	gfs2_log_flush(gl->gl_sbd, gl);
b3b94faa DT	231	gfs2_meta_sync(gl, flags \| DIO_START \| DIO_WAIT);
	232	} else if (data)
	233	gfs2_page_sync(gl, flags \| DIO_START \| DIO_WAIT);
	234	if (flags & DIO_RELEASE)
	235	gfs2_ail_empty_gl(gl);
	236	}
	237
b3b94faa DT	238	}
	239
	240	/**
	241	* inode_go_inval - prepare a inode glock to be released
	242	* @gl: the glock
	243	* @flags:
	244	*
	245	*/
	246
	247	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	248	{
	249	int meta = (flags & DIO_METADATA);
	250	int data = (flags & DIO_DATA);
	251
	252	if (meta) {
	253	gfs2_meta_inval(gl);
	254	gl->gl_vn++;
	255	}
	256	if (data)
	257	gfs2_page_inval(gl);
	258	}
	259
	260	/**
	261	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	262	* @gl: the glock
	263	*
	264	* Returns: 1 if it's ok
	265	*/
	266
	267	static int inode_go_demote_ok(struct gfs2_glock *gl)
	268	{
	269	struct gfs2_sbd *sdp = gl->gl_sbd;
	270	int demote = 0;
	271
5c676f6d	272	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	273	demote = 1;
	274	else if (!sdp->sd_args.ar_localcaching &&
	275	time_after_eq(jiffies, gl->gl_stamp +
	276	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	277	demote = 1;
	278
	279	return demote;
	280	}
	281
	282	/**
	283	* inode_go_lock - operation done after an inode lock is locked by a process
	284	* @gl: the glock
	285	* @flags:
	286	*
	287	* Returns: errno
	288	*/
	289
	290	static int inode_go_lock(struct gfs2_holder *gh)
	291	{
	292	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	293	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	294	int error = 0;
	295
	296	if (!ip)
	297	return 0;
	298
	299	if (ip->i_vn != gl->gl_vn) {
	300	error = gfs2_inode_refresh(ip);
	301	if (error)
	302	return error;
	303	gfs2_inode_attr_in(ip);
	304	}
	305
	306	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	307	(gl->gl_state == LM_ST_EXCLUSIVE) &&
	308	(gh->gh_flags & GL_LOCAL_EXCL))
	309	error = gfs2_truncatei_resume(ip);
	310
	311	return error;
	312	}
	313
	314	/**
	315	* inode_go_unlock - operation done before an inode lock is unlocked by a
	316	* process
	317	* @gl: the glock
	318	* @flags:
	319	*
	320	*/
	321
	322	static void inode_go_unlock(struct gfs2_holder *gh)
	323	{
	324	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	325	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	326
f45b7ddd SW	327	if (ip) {
	328	if (test_bit(GLF_DIRTY, &gl->gl_flags))
	329	gfs2_inode_attr_in(ip);
b3b94faa	330
b3b94faa	331	gfs2_meta_cache_flush(ip);
f45b7ddd	332	}
b3b94faa DT	333	}
	334
	335	/**
	336	* inode_greedy -
	337	* @gl: the glock
	338	*
	339	*/
	340
	341	static void inode_greedy(struct gfs2_glock *gl)
	342	{
	343	struct gfs2_sbd *sdp = gl->gl_sbd;
5c676f6d	344	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	345	unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
	346	unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
	347	unsigned int new_time;
	348
	349	spin_lock(&ip->i_spin);
	350
	351	if (time_after(ip->i_last_pfault + quantum, jiffies)) {
	352	new_time = ip->i_greedy + quantum;
	353	if (new_time > max)
	354	new_time = max;
	355	} else {
	356	new_time = ip->i_greedy - quantum;
	357	if (!new_time \|\| new_time > max)
	358	new_time = 1;
	359	}
	360
	361	ip->i_greedy = new_time;
	362
	363	spin_unlock(&ip->i_spin);
	364
feaa7bba	365	iput(&ip->i_inode);
b3b94faa DT	366	}
	367
	368	/**
	369	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	370	* @gl: the glock
	371	*
	372	* Returns: 1 if it's ok
	373	*/
	374
	375	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	376	{
	377	return !gl->gl_aspace->i_mapping->nrpages;
	378	}
	379
	380	/**
	381	* rgrp_go_lock - operation done after an rgrp lock is locked by
	382	* a first holder on this node.
	383	* @gl: the glock
	384	* @flags:
	385	*
	386	* Returns: errno
	387	*/
	388
	389	static int rgrp_go_lock(struct gfs2_holder *gh)
	390	{
5c676f6d	391	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	392	}
	393
	394	/**
	395	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	396	* a last holder on this node.
	397	* @gl: the glock
	398	* @flags:
	399	*
	400	*/
	401
	402	static void rgrp_go_unlock(struct gfs2_holder *gh)
	403	{
5c676f6d	404	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	405	}
	406
	407	/**
	408	* trans_go_xmote_th - promote/demote the transaction glock
	409	* @gl: the glock
	410	* @state: the requested state
	411	* @flags:
	412	*
	413	*/
	414
	415	static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	416	int flags)
	417	{
	418	struct gfs2_sbd *sdp = gl->gl_sbd;
	419
	420	if (gl->gl_state != LM_ST_UNLOCKED &&
	421	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	422	gfs2_meta_syncfs(sdp);
	423	gfs2_log_shutdown(sdp);
	424	}
	425
	426	gfs2_glock_xmote_th(gl, state, flags);
	427	}
	428
	429	/**
	430	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	431	* @gl: the glock
	432	*
	433	*/
	434
	435	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	436	{
	437	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	438	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	439	struct gfs2_glock *j_gl = ip->i_gl;
b3b94faa DT	440	struct gfs2_log_header head;
	441	int error;
	442
	443	if (gl->gl_state != LM_ST_UNLOCKED &&
	444	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
feaa7bba	445	gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
b3b94faa DT	446	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA \| DIO_DATA);
	447
	448	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	449	if (error)
	450	gfs2_consist(sdp);
	451	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	452	gfs2_consist(sdp);
	453
	454	/* Initialize some head of the log stuff */
	455	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	456	sdp->sd_log_sequence = head.lh_sequence + 1;
	457	gfs2_log_pointers_init(sdp, head.lh_blkno);
	458	}
	459	}
	460	}
	461
	462	/**
	463	* trans_go_drop_th - unlock the transaction glock
	464	* @gl: the glock
	465	*
	466	* We want to sync the device even with localcaching. Remember
	467	* that localcaching journal replay only marks buffers dirty.
	468	*/
	469
	470	static void trans_go_drop_th(struct gfs2_glock *gl)
	471	{
	472	struct gfs2_sbd *sdp = gl->gl_sbd;
	473
	474	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	475	gfs2_meta_syncfs(sdp);
	476	gfs2_log_shutdown(sdp);
	477	}
	478
	479	gfs2_glock_drop_th(gl);
	480	}
	481
	482	/**
	483	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	484	* @gl: the glock
	485	*
	486	* Returns: 1 if it's ok
	487	*/
	488
	489	static int quota_go_demote_ok(struct gfs2_glock *gl)
	490	{
	491	return !atomic_read(&gl->gl_lvb_count);
	492	}
	493
8fb4b536	494	const struct gfs2_glock_operations gfs2_meta_glops = {
b3b94faa DT	495	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	496	.go_drop_th = gfs2_glock_drop_th,
b3b94faa DT	497	.go_type = LM_TYPE_META
	498	};
	499
8fb4b536	500	const struct gfs2_glock_operations gfs2_inode_glops = {
b3b94faa DT	501	.go_xmote_th = inode_go_xmote_th,
	502	.go_xmote_bh = inode_go_xmote_bh,
	503	.go_drop_th = inode_go_drop_th,
	504	.go_sync = inode_go_sync,
	505	.go_inval = inode_go_inval,
	506	.go_demote_ok = inode_go_demote_ok,
	507	.go_lock = inode_go_lock,
	508	.go_unlock = inode_go_unlock,
	509	.go_greedy = inode_greedy,
	510	.go_type = LM_TYPE_INODE
	511	};
	512
8fb4b536	513	const struct gfs2_glock_operations gfs2_rgrp_glops = {
b3b94faa DT	514	.go_xmote_th = gfs2_glock_xmote_th,
	515	.go_drop_th = gfs2_glock_drop_th,
	516	.go_sync = meta_go_sync,
	517	.go_inval = meta_go_inval,
	518	.go_demote_ok = rgrp_go_demote_ok,
	519	.go_lock = rgrp_go_lock,
	520	.go_unlock = rgrp_go_unlock,
	521	.go_type = LM_TYPE_RGRP
	522	};
	523
8fb4b536	524	const struct gfs2_glock_operations gfs2_trans_glops = {
b3b94faa DT	525	.go_xmote_th = trans_go_xmote_th,
	526	.go_xmote_bh = trans_go_xmote_bh,
	527	.go_drop_th = trans_go_drop_th,
	528	.go_type = LM_TYPE_NONDISK
	529	};
	530
8fb4b536	531	const struct gfs2_glock_operations gfs2_iopen_glops = {
b3b94faa DT	532	.go_xmote_th = gfs2_glock_xmote_th,
	533	.go_drop_th = gfs2_glock_drop_th,
	534	.go_callback = gfs2_iopen_go_callback,
	535	.go_type = LM_TYPE_IOPEN
	536	};
	537
8fb4b536	538	const struct gfs2_glock_operations gfs2_flock_glops = {
b3b94faa DT	539	.go_xmote_th = gfs2_glock_xmote_th,
	540	.go_drop_th = gfs2_glock_drop_th,
	541	.go_type = LM_TYPE_FLOCK
	542	};
	543
8fb4b536	544	const struct gfs2_glock_operations gfs2_nondisk_glops = {
b3b94faa DT	545	.go_xmote_th = gfs2_glock_xmote_th,
	546	.go_drop_th = gfs2_glock_drop_th,
	547	.go_type = LM_TYPE_NONDISK
	548	};
	549
8fb4b536	550	const struct gfs2_glock_operations gfs2_quota_glops = {
b3b94faa DT	551	.go_xmote_th = gfs2_glock_xmote_th,
	552	.go_drop_th = gfs2_glock_drop_th,
	553	.go_demote_ok = quota_go_demote_ok,
	554	.go_type = LM_TYPE_QUOTA
	555	};
	556
8fb4b536	557	const struct gfs2_glock_operations gfs2_journal_glops = {
b3b94faa DT	558	.go_xmote_th = gfs2_glock_xmote_th,
	559	.go_drop_th = gfs2_glock_drop_th,
	560	.go_type = LM_TYPE_JOURNAL
	561	};
	562