[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 <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 (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_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, 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);
	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
 *
 */

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)) {
		gfs2_log_flush(gl->gl_sbd, gl);
		if (ip)
			filemap_fdatawrite(ip->i_inode.i_mapping);
		gfs2_meta_sync(gl);
		if (ip) {
			struct address_space *mapping = ip->i_inode.i_mapping;
			int error = filemap_fdatawait(mapping);
			if (error == -ENOSPC)
				set_bit(AS_ENOSPC, &mapping->flags);
			else if (error)
				set_bit(AS_EIO, &mapping->flags);
		}
		clear_bit(GLF_DIRTY, &gl->gl_flags);
		gfs2_ail_empty_gl(gl);
	}
}

/**
 * inode_go_inval - prepare a inode glock to be released
 * @gl: the glock
 * @flags:
 *
 */

static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
	struct gfs2_inode *ip = gl->gl_object;
	int meta = (flags & DIO_METADATA);

	if (meta) {
		gfs2_meta_inval(gl);
		if (ip)
			set_bit(GIF_INVALID, &ip->i_flags);
	}

	if (ip && S_ISREG(ip->i_inode.i_mode)) {
		truncate_inode_pages(ip->i_inode.i_mapping, 0);
		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !ip->i_inode.i_mapping->nrpages);
		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, 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_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);
	}

	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_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_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>
7d308590	16	#include <linux/lm_interface.h>
b3b94faa DT	17
b3b94faa DT	18	#include "gfs2.h"
5c676f6d	19	#include "incore.h"
b3b94faa DT	20	#include "bmap.h"
	21	#include "glock.h"
	22	#include "glops.h"
	23	#include "inode.h"
	24	#include "log.h"
	25	#include "meta_io.h"
b3b94faa DT	26	#include "recovery.h"
b3b94faa DT	27	#include "rgrp.h"
5c676f6d	28	#include "util.h"
ddacfaf7	29	#include "trans.h"
b3b94faa	30
ddacfaf7 SW	31	/**
	32	* ail_empty_gl - remove all buffers for a given lock from the AIL
	33	* @gl: the glock
	34	*
	35	* None of the buffers should be dirty, locked, or pinned.
	36	*/
	37
	38	static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
	39	{
	40	struct gfs2_sbd *sdp = gl->gl_sbd;
	41	unsigned int blocks;
	42	struct list_head *head = &gl->gl_ail_list;
	43	struct gfs2_bufdata *bd;
	44	struct buffer_head *bh;
	45	u64 blkno;
	46	int error;
	47
	48	blocks = atomic_read(&gl->gl_ail_count);
	49	if (!blocks)
	50	return;
	51
	52	error = gfs2_trans_begin(sdp, 0, blocks);
	53	if (gfs2_assert_withdraw(sdp, !error))
	54	return;
	55
	56	gfs2_log_lock(sdp);
	57	while (!list_empty(head)) {
	58	bd = list_entry(head->next, struct gfs2_bufdata,
	59	bd_ail_gl_list);
	60	bh = bd->bd_bh;
	61	blkno = bh->b_blocknr;
	62	gfs2_assert_withdraw(sdp, !buffer_busy(bh));
	63
	64	bd->bd_ail = NULL;
	65	list_del(&bd->bd_ail_st_list);
	66	list_del(&bd->bd_ail_gl_list);
	67	atomic_dec(&gl->gl_ail_count);
	68	brelse(bh);
	69	gfs2_log_unlock(sdp);
	70
	71	gfs2_trans_add_revoke(sdp, blkno);
	72
	73	gfs2_log_lock(sdp);
	74	}
	75	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	76	gfs2_log_unlock(sdp);
	77
	78	gfs2_trans_end(sdp);
	79	gfs2_log_flush(sdp, NULL);
	80	}
ba7f7290 SW	81
	82	/**
	83	* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
	84	* @gl: the glock
	85	*
	86	*/
	87
	88	static void gfs2_pte_inval(struct gfs2_glock *gl)
	89	{
	90	struct gfs2_inode *ip;
	91	struct inode *inode;
	92
	93	ip = gl->gl_object;
	94	inode = &ip->i_inode;
b60623c2	95	if (!ip \|\| !S_ISREG(inode->i_mode))
ba7f7290 SW	96	return;
	97
	98	if (!test_bit(GIF_PAGED, &ip->i_flags))
	99	return;
	100
	101	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
	102
	103	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
	104	set_bit(GLF_DIRTY, &gl->gl_flags);
	105
	106	clear_bit(GIF_SW_PAGED, &ip->i_flags);
	107	}
	108
b3b94faa DT	109	/**
	110	* meta_go_sync - sync out the metadata for this glock
	111	* @gl: the glock
b3b94faa DT	112	*
	113	* Called when demoting or unlocking an EX glock. We must flush
	114	* to disk all dirty buffers/pages relating to this glock, and must not
	115	* not return to caller to demote/unlock the glock until I/O is complete.
	116	*/
	117
1a14d3a6	118	static void meta_go_sync(struct gfs2_glock *gl)
b3b94faa	119	{
b3b94faa	120	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	121	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0	122	gfs2_meta_sync(gl);
1a14d3a6	123	gfs2_ail_empty_gl(gl);
b3b94faa DT	124	}
b3b94faa DT	125
b3b94faa DT	126	}
	127
	128	/**
	129	* meta_go_inval - invalidate the metadata for this glock
	130	* @gl: the glock
	131	* @flags:
	132	*
	133	*/
	134
	135	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	136	{
	137	if (!(flags & DIO_METADATA))
	138	return;
	139
	140	gfs2_meta_inval(gl);
	141	gl->gl_vn++;
	142	}
	143
b3b94faa DT	144	/**
	145	* inode_go_xmote_th - promote/demote a glock
	146	* @gl: the glock
	147	* @state: the requested state
	148	* @flags:
	149	*
	150	*/
	151
	152	static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	153	int flags)
	154	{
	155	if (gl->gl_state != LM_ST_UNLOCKED)
	156	gfs2_pte_inval(gl);
	157	gfs2_glock_xmote_th(gl, state, flags);
	158	}
	159
	160	/**
	161	* inode_go_xmote_bh - After promoting/demoting a glock
	162	* @gl: the glock
	163	*
	164	*/
	165
	166	static void inode_go_xmote_bh(struct gfs2_glock *gl)
	167	{
	168	struct gfs2_holder *gh = gl->gl_req_gh;
	169	struct buffer_head *bh;
	170	int error;
	171
	172	if (gl->gl_state != LM_ST_UNLOCKED &&
	173	(!gh \|\| !(gh->gh_flags & GL_SKIP))) {
7276b3b0	174	error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
b3b94faa DT	175	if (!error)
	176	brelse(bh);
	177	}
	178	}
	179
	180	/**
	181	* inode_go_drop_th - unlock a glock
	182	* @gl: the glock
	183	*
	184	* Invoked from rq_demote().
	185	* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
	186	* is being purged from our node's glock cache; we're dropping lock.
	187	*/
	188
	189	static void inode_go_drop_th(struct gfs2_glock *gl)
	190	{
	191	gfs2_pte_inval(gl);
	192	gfs2_glock_drop_th(gl);
	193	}
	194
	195	/**
	196	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	197	* @gl: the glock protecting the inode
b3b94faa DT	198	*
	199	*/
	200
1a14d3a6	201	static void inode_go_sync(struct gfs2_glock *gl)
b3b94faa	202	{
b004157a SW	203	struct gfs2_inode *ip = gl->gl_object;
	204
	205	if (ip && !S_ISREG(ip->i_inode.i_mode))
	206	ip = NULL;
	207
b3b94faa	208	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
1a14d3a6	209	gfs2_log_flush(gl->gl_sbd, gl);
b004157a SW	210	if (ip)
b004157a SW	211	filemap_fdatawrite(ip->i_inode.i_mapping);
1a14d3a6	212	gfs2_meta_sync(gl);
b004157a SW	213	if (ip) {
	214	struct address_space *mapping = ip->i_inode.i_mapping;
	215	int error = filemap_fdatawait(mapping);
	216	if (error == -ENOSPC)
	217	set_bit(AS_ENOSPC, &mapping->flags);
	218	else if (error)
	219	set_bit(AS_EIO, &mapping->flags);
	220	}
1a14d3a6 SW	221	clear_bit(GLF_DIRTY, &gl->gl_flags);
1a14d3a6 SW	222	gfs2_ail_empty_gl(gl);
b3b94faa	223	}
b3b94faa DT	224	}
	225
	226	/**
	227	* inode_go_inval - prepare a inode glock to be released
	228	* @gl: the glock
	229	* @flags:
	230	*
	231	*/
	232
	233	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	234	{
b004157a	235	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	236	int meta = (flags & DIO_METADATA);
b3b94faa DT	237
	238	if (meta) {
	239	gfs2_meta_inval(gl);
b004157a SW	240	if (ip)
	241	set_bit(GIF_INVALID, &ip->i_flags);
	242	}
	243
	244	if (ip && S_ISREG(ip->i_inode.i_mode)) {
	245	truncate_inode_pages(ip->i_inode.i_mapping, 0);
	246	gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !ip->i_inode.i_mapping->nrpages);
	247	clear_bit(GIF_PAGED, &ip->i_flags);
b3b94faa	248	}
b3b94faa DT	249	}
	250
	251	/**
	252	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	253	* @gl: the glock
	254	*
	255	* Returns: 1 if it's ok
	256	*/
	257
	258	static int inode_go_demote_ok(struct gfs2_glock *gl)
	259	{
	260	struct gfs2_sbd *sdp = gl->gl_sbd;
	261	int demote = 0;
	262
5c676f6d	263	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	264	demote = 1;
	265	else if (!sdp->sd_args.ar_localcaching &&
	266	time_after_eq(jiffies, gl->gl_stamp +
	267	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	268	demote = 1;
	269
	270	return demote;
	271	}
	272
	273	/**
	274	* inode_go_lock - operation done after an inode lock is locked by a process
	275	* @gl: the glock
	276	* @flags:
	277	*
	278	* Returns: errno
	279	*/
	280
	281	static int inode_go_lock(struct gfs2_holder *gh)
	282	{
	283	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	284	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	285	int error = 0;
	286
	287	if (!ip)
	288	return 0;
	289
bfded27b	290	if (test_bit(GIF_INVALID, &ip->i_flags)) {
b3b94faa DT	291	error = gfs2_inode_refresh(ip);
	292	if (error)
	293	return error;
b3b94faa DT	294	}
	295
	296	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	297	(gl->gl_state == LM_ST_EXCLUSIVE) &&
1c0f4872	298	(gh->gh_state == LM_ST_EXCLUSIVE))
b3b94faa DT	299	error = gfs2_truncatei_resume(ip);
	300
	301	return error;
	302	}
	303
	304	/**
	305	* inode_go_unlock - operation done before an inode lock is unlocked by a
	306	* process
	307	* @gl: the glock
	308	* @flags:
	309	*
	310	*/
	311
	312	static void inode_go_unlock(struct gfs2_holder *gh)
	313	{
	314	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	315	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	316
9e2dbdac SW	317	if (ip)
9e2dbdac SW	318	gfs2_meta_cache_flush(ip);
b3b94faa DT	319	}
b3b94faa DT	320
b3b94faa DT	321	/**
	322	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	323	* @gl: the glock
	324	*
	325	* Returns: 1 if it's ok
	326	*/
	327
	328	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	329	{
	330	return !gl->gl_aspace->i_mapping->nrpages;
	331	}
	332
	333	/**
	334	* rgrp_go_lock - operation done after an rgrp lock is locked by
	335	* a first holder on this node.
	336	* @gl: the glock
	337	* @flags:
	338	*
	339	* Returns: errno
	340	*/
	341
	342	static int rgrp_go_lock(struct gfs2_holder *gh)
	343	{
5c676f6d	344	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	345	}
	346
	347	/**
	348	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	349	* a last holder on this node.
	350	* @gl: the glock
	351	* @flags:
	352	*
	353	*/
	354
	355	static void rgrp_go_unlock(struct gfs2_holder *gh)
	356	{
5c676f6d	357	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	358	}
	359
	360	/**
	361	* trans_go_xmote_th - promote/demote the transaction glock
	362	* @gl: the glock
	363	* @state: the requested state
	364	* @flags:
	365	*
	366	*/
	367
	368	static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	369	int flags)
	370	{
	371	struct gfs2_sbd *sdp = gl->gl_sbd;
	372
	373	if (gl->gl_state != LM_ST_UNLOCKED &&
	374	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	375	gfs2_meta_syncfs(sdp);
	376	gfs2_log_shutdown(sdp);
	377	}
	378
	379	gfs2_glock_xmote_th(gl, state, flags);
	380	}
	381
	382	/**
	383	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	384	* @gl: the glock
	385	*
	386	*/
	387
	388	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	389	{
	390	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	391	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	392	struct gfs2_glock *j_gl = ip->i_gl;
55167622	393	struct gfs2_log_header_host head;
b3b94faa DT	394	int error;
	395
	396	if (gl->gl_state != LM_ST_UNLOCKED &&
	397	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
feaa7bba	398	gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
1a14d3a6	399	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
b3b94faa DT	400
	401	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	402	if (error)
	403	gfs2_consist(sdp);
	404	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	405	gfs2_consist(sdp);
	406
	407	/* Initialize some head of the log stuff */
	408	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	409	sdp->sd_log_sequence = head.lh_sequence + 1;
	410	gfs2_log_pointers_init(sdp, head.lh_blkno);
	411	}
	412	}
	413	}
	414
	415	/**
	416	* trans_go_drop_th - unlock the transaction glock
	417	* @gl: the glock
	418	*
	419	* We want to sync the device even with localcaching. Remember
	420	* that localcaching journal replay only marks buffers dirty.
	421	*/
	422
	423	static void trans_go_drop_th(struct gfs2_glock *gl)
	424	{
	425	struct gfs2_sbd *sdp = gl->gl_sbd;
	426
	427	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	428	gfs2_meta_syncfs(sdp);
	429	gfs2_log_shutdown(sdp);
	430	}
	431
	432	gfs2_glock_drop_th(gl);
	433	}
	434
	435	/**
	436	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	437	* @gl: the glock
	438	*
	439	* Returns: 1 if it's ok
	440	*/
	441
	442	static int quota_go_demote_ok(struct gfs2_glock *gl)
	443	{
	444	return !atomic_read(&gl->gl_lvb_count);
	445	}
	446
8fb4b536	447	const struct gfs2_glock_operations gfs2_meta_glops = {
b3b94faa DT	448	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	449	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	450	.go_type = LM_TYPE_META,
b3b94faa DT	451	};
b3b94faa DT	452
8fb4b536	453	const struct gfs2_glock_operations gfs2_inode_glops = {
b3b94faa DT	454	.go_xmote_th = inode_go_xmote_th,
	455	.go_xmote_bh = inode_go_xmote_bh,
	456	.go_drop_th = inode_go_drop_th,
	457	.go_sync = inode_go_sync,
	458	.go_inval = inode_go_inval,
	459	.go_demote_ok = inode_go_demote_ok,
	460	.go_lock = inode_go_lock,
	461	.go_unlock = inode_go_unlock,
ea67eedb	462	.go_type = LM_TYPE_INODE,
b3b94faa DT	463	};
b3b94faa DT	464
8fb4b536	465	const struct gfs2_glock_operations gfs2_rgrp_glops = {
b3b94faa DT	466	.go_xmote_th = gfs2_glock_xmote_th,
	467	.go_drop_th = gfs2_glock_drop_th,
	468	.go_sync = meta_go_sync,
	469	.go_inval = meta_go_inval,
	470	.go_demote_ok = rgrp_go_demote_ok,
	471	.go_lock = rgrp_go_lock,
	472	.go_unlock = rgrp_go_unlock,
ea67eedb	473	.go_type = LM_TYPE_RGRP,
b3b94faa DT	474	};
b3b94faa DT	475
8fb4b536	476	const struct gfs2_glock_operations gfs2_trans_glops = {
b3b94faa DT	477	.go_xmote_th = trans_go_xmote_th,
	478	.go_xmote_bh = trans_go_xmote_bh,
	479	.go_drop_th = trans_go_drop_th,
ea67eedb	480	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	481	};
b3b94faa DT	482
8fb4b536	483	const struct gfs2_glock_operations gfs2_iopen_glops = {
b3b94faa DT	484	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	485	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	486	.go_type = LM_TYPE_IOPEN,
b3b94faa DT	487	};
b3b94faa DT	488
8fb4b536	489	const struct gfs2_glock_operations gfs2_flock_glops = {
b3b94faa DT	490	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	491	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	492	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	493	};
b3b94faa DT	494
8fb4b536	495	const struct gfs2_glock_operations gfs2_nondisk_glops = {
b3b94faa DT	496	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	497	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	498	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	499	};
b3b94faa DT	500
8fb4b536	501	const struct gfs2_glock_operations gfs2_quota_glops = {
b3b94faa DT	502	.go_xmote_th = gfs2_glock_xmote_th,
	503	.go_drop_th = gfs2_glock_drop_th,
	504	.go_demote_ok = quota_go_demote_ok,
ea67eedb	505	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	506	};
b3b94faa DT	507
8fb4b536	508	const struct gfs2_glock_operations gfs2_journal_glops = {
b3b94faa DT	509	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	510	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	511	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	512	};
b3b94faa DT	513