[deliverable/linux.git] / fs / gfs2 / glops.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 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/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.h>
#include <linux/posix_acl.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;
	struct list_head *head = &gl->gl_ail_list;
	struct gfs2_bufdata *bd;
	struct buffer_head *bh;
	struct gfs2_trans tr;

	memset(&tr, 0, sizeof(tr));
	tr.tr_revokes = atomic_read(&gl->gl_ail_count);

	if (!tr.tr_revokes)
		return;

	/* A shortened, inline version of gfs2_trans_begin() */
	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
	tr.tr_ip = (unsigned long)__builtin_return_address(0);
	INIT_LIST_HEAD(&tr.tr_list_buf);
	gfs2_log_reserve(sdp, tr.tr_reserved);
	BUG_ON(current->journal_info);
	current->journal_info = &tr;

	spin_lock(&sdp->sd_ail_lock);
	while (!list_empty(head)) {
		bd = list_entry(head->next, struct gfs2_bufdata,
				bd_ail_gl_list);
		bh = bd->bd_bh;
		gfs2_remove_from_ail(bd);
		spin_unlock(&sdp->sd_ail_lock);

		bd->bd_bh = NULL;
		bh->b_private = NULL;
		bd->bd_blkno = bh->b_blocknr;
		gfs2_log_lock(sdp);
		gfs2_assert_withdraw(sdp, !buffer_busy(bh));
		gfs2_trans_add_revoke(sdp, bd);
		gfs2_log_unlock(sdp);

		spin_lock(&sdp->sd_ail_lock);
	}
	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	spin_unlock(&sdp->sd_ail_lock);

	gfs2_trans_end(sdp);
	gfs2_log_flush(sdp, NULL);
}

/**
 * rgrp_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 rgrp_go_sync(struct gfs2_glock *gl)
{
	struct address_space *metamapping = gfs2_glock2aspace(gl);
	int error;

	if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
		return;
	BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);

	gfs2_log_flush(gl->gl_sbd, gl);
	filemap_fdatawrite(metamapping);
	error = filemap_fdatawait(metamapping);
        mapping_set_error(metamapping, error);
	gfs2_ail_empty_gl(gl);
}

/**
 * rgrp_go_inval - invalidate the metadata for this glock
 * @gl: the glock
 * @flags:
 *
 * We never used LM_ST_DEFERRED with resource groups, so that we
 * should always see the metadata flag set here.
 *
 */

static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
{
	struct address_space *mapping = gfs2_glock2aspace(gl);

	BUG_ON(!(flags & DIO_METADATA));
	gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
	truncate_inode_pages(mapping, 0);

	if (gl->gl_object) {
		struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
		rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
	}
}

/**
 * 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;
	struct address_space *metamapping = gfs2_glock2aspace(gl);
	int error;

	if (ip && !S_ISREG(ip->i_inode.i_mode))
		ip = NULL;
	if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
		unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
	if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
		return;

	BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);

	gfs2_log_flush(gl->gl_sbd, gl);
	filemap_fdatawrite(metamapping);
	if (ip) {
		struct address_space *mapping = ip->i_inode.i_mapping;
		filemap_fdatawrite(mapping);
		error = filemap_fdatawait(mapping);
		mapping_set_error(mapping, error);
	}
	error = filemap_fdatawait(metamapping);
	mapping_set_error(metamapping, error);
	gfs2_ail_empty_gl(gl);
	/*
	 * Writeback of the data mapping may cause the dirty flag to be set
	 * so we have to clear it again here.
	 */
	smp_mb__before_clear_bit();
	clear_bit(GLF_DIRTY, &gl->gl_flags);
}

/**
 * inode_go_inval - prepare a inode glock to be released
 * @gl: the glock
 * @flags:
 * 
 * Normally we invlidate everything, but if we are moving into
 * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
 * can keep hold of the metadata, since it won't have changed.
 *
 */

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

	gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));

	if (flags & DIO_METADATA) {
		struct address_space *mapping = gfs2_glock2aspace(gl);
		truncate_inode_pages(mapping, 0);
		if (ip) {
			set_bit(GIF_INVALID, &ip->i_flags);
			forget_all_cached_acls(&ip->i_inode);
		}
	}

	if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
		gl->gl_sbd->sd_rindex_uptodate = 0;
	if (ip && S_ISREG(ip->i_inode.i_mode))
		truncate_inode_pages(ip->i_inode.i_mapping, 0);
}

/**
 * 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(const struct gfs2_glock *gl)
{
	struct gfs2_sbd *sdp = gl->gl_sbd;
	struct gfs2_holder *gh;

	if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
		return 0;

	if (!list_empty(&gl->gl_holders)) {
		gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
		if (gh->gh_list.next != &gl->gl_holders)
			return 0;
	}

	return 1;
}

/**
 * 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_sbd *sdp = gl->gl_sbd;
	struct gfs2_inode *ip = gl->gl_object;
	int error = 0;

	if (!ip || (gh->gh_flags & GL_SKIP))
		return 0;

	if (test_bit(GIF_INVALID, &ip->i_flags)) {
		error = gfs2_inode_refresh(ip);
		if (error)
			return error;
	}

	if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
	    (gl->gl_state == LM_ST_EXCLUSIVE) &&
	    (gh->gh_state == LM_ST_EXCLUSIVE)) {
		spin_lock(&sdp->sd_trunc_lock);
		if (list_empty(&ip->i_trunc_list))
			list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
		spin_unlock(&sdp->sd_trunc_lock);
		wake_up(&sdp->sd_quota_wait);
		return 1;
	}

	return error;
}

/**
 * inode_go_dump - print information about an inode
 * @seq: The iterator
 * @ip: the inode
 *
 * Returns: 0 on success, -ENOBUFS when we run out of space
 */

static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
{
	const struct gfs2_inode *ip = gl->gl_object;
	if (ip == NULL)
		return 0;
	gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
		  (unsigned long long)ip->i_no_formal_ino,
		  (unsigned long long)ip->i_no_addr,
		  IF2DT(ip->i_inode.i_mode), ip->i_flags,
		  (unsigned int)ip->i_diskflags,
		  (unsigned long long)i_size_read(&ip->i_inode));
	return 0;
}

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

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

	if (gl->gl_state != LM_ST_UNLOCKED &&
	    test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
		gfs2_meta_syncfs(sdp);
		gfs2_log_shutdown(sdp);
	}
}

/**
 * trans_go_xmote_bh - After promoting/demoting the transaction glock
 * @gl: the glock
 *
 */

static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
{
	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 (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
		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);
		}
	}
	return 0;
}

/**
 * trans_go_demote_ok
 * @gl: the glock
 *
 * Always returns 0
 */

static int trans_go_demote_ok(const struct gfs2_glock *gl)
{
	return 0;
}

/**
 * iopen_go_callback - schedule the dcache entry for the inode to be deleted
 * @gl: the glock
 *
 * gl_spin lock is held while calling this
 */
static void iopen_go_callback(struct gfs2_glock *gl)
{
	struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;

	if (gl->gl_demote_state == LM_ST_UNLOCKED &&
	    gl->gl_state == LM_ST_SHARED && ip) {
		gfs2_glock_hold(gl);
		if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
			gfs2_glock_put_nolock(gl);
	}
}

const struct gfs2_glock_operations gfs2_meta_glops = {
	.go_type = LM_TYPE_META,
};

const struct gfs2_glock_operations gfs2_inode_glops = {
	.go_xmote_th = inode_go_sync,
	.go_inval = inode_go_inval,
	.go_demote_ok = inode_go_demote_ok,
	.go_lock = inode_go_lock,
	.go_dump = inode_go_dump,
	.go_type = LM_TYPE_INODE,
	.go_min_hold_time = HZ / 5,
	.go_flags = GLOF_ASPACE,
};

const struct gfs2_glock_operations gfs2_rgrp_glops = {
	.go_xmote_th = rgrp_go_sync,
	.go_inval = rgrp_go_inval,
	.go_lock = rgrp_go_lock,
	.go_unlock = rgrp_go_unlock,
	.go_dump = gfs2_rgrp_dump,
	.go_type = LM_TYPE_RGRP,
	.go_min_hold_time = HZ / 5,
	.go_flags = GLOF_ASPACE,
};

const struct gfs2_glock_operations gfs2_trans_glops = {
	.go_xmote_th = trans_go_sync,
	.go_xmote_bh = trans_go_xmote_bh,
	.go_demote_ok = trans_go_demote_ok,
	.go_type = LM_TYPE_NONDISK,
};

const struct gfs2_glock_operations gfs2_iopen_glops = {
	.go_type = LM_TYPE_IOPEN,
	.go_callback = iopen_go_callback,
};

const struct gfs2_glock_operations gfs2_flock_glops = {
	.go_type = LM_TYPE_FLOCK,
};

const struct gfs2_glock_operations gfs2_nondisk_glops = {
	.go_type = LM_TYPE_NONDISK,
};

const struct gfs2_glock_operations gfs2_quota_glops = {
	.go_type = LM_TYPE_QUOTA,
};

const struct gfs2_glock_operations gfs2_journal_glops = {
	.go_type = LM_TYPE_JOURNAL,
};

const struct gfs2_glock_operations *gfs2_glops_list[] = {
	[LM_TYPE_META] = &gfs2_meta_glops,
	[LM_TYPE_INODE] = &gfs2_inode_glops,
	[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
	[LM_TYPE_IOPEN] = &gfs2_iopen_glops,
	[LM_TYPE_FLOCK] = &gfs2_flock_glops,
	[LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
	[LM_TYPE_QUOTA] = &gfs2_quota_glops,
	[LM_TYPE_JOURNAL] = &gfs2_journal_glops,
};
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
cf45b752	3	* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
b3b94faa DT	9
b3b94faa DT	10	#include <linux/spinlock.h>
	11	#include <linux/completion.h>
	12	#include <linux/buffer_head.h>
5c676f6d	13	#include <linux/gfs2_ondisk.h>
6802e340	14	#include <linux/bio.h>
c65f7fb5	15	#include <linux/posix_acl.h>
b3b94faa DT	16
b3b94faa DT	17	#include "gfs2.h"
5c676f6d	18	#include "incore.h"
b3b94faa DT	19	#include "bmap.h"
	20	#include "glock.h"
	21	#include "glops.h"
	22	#include "inode.h"
	23	#include "log.h"
	24	#include "meta_io.h"
b3b94faa DT	25	#include "recovery.h"
b3b94faa DT	26	#include "rgrp.h"
5c676f6d	27	#include "util.h"
ddacfaf7	28	#include "trans.h"
b3b94faa	29
ddacfaf7 SW	30	/**
	31	* ail_empty_gl - remove all buffers for a given lock from the AIL
	32	* @gl: the glock
	33	*
	34	* None of the buffers should be dirty, locked, or pinned.
	35	*/
	36
	37	static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
	38	{
	39	struct gfs2_sbd *sdp = gl->gl_sbd;
ddacfaf7 SW	40	struct list_head *head = &gl->gl_ail_list;
	41	struct gfs2_bufdata *bd;
	42	struct buffer_head *bh;
d8348de0	43	struct gfs2_trans tr;
ddacfaf7	44
d8348de0 SW	45	memset(&tr, 0, sizeof(tr));
d8348de0 SW	46	tr.tr_revokes = atomic_read(&gl->gl_ail_count);
ddacfaf7	47
d8348de0	48	if (!tr.tr_revokes)
ddacfaf7 SW	49	return;
ddacfaf7 SW	50
d8348de0 SW	51	/* A shortened, inline version of gfs2_trans_begin() */
	52	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
	53	tr.tr_ip = (unsigned long)__builtin_return_address(0);
	54	INIT_LIST_HEAD(&tr.tr_list_buf);
	55	gfs2_log_reserve(sdp, tr.tr_reserved);
	56	BUG_ON(current->journal_info);
	57	current->journal_info = &tr;
	58
d6a079e8	59	spin_lock(&sdp->sd_ail_lock);
ddacfaf7 SW	60	while (!list_empty(head)) {
	61	bd = list_entry(head->next, struct gfs2_bufdata,
	62	bd_ail_gl_list);
	63	bh = bd->bd_bh;
f91a0d3e	64	gfs2_remove_from_ail(bd);
d6a079e8 DC	65	spin_unlock(&sdp->sd_ail_lock);
d6a079e8 DC	66
1ad38c43 SW	67	bd->bd_bh = NULL;
	68	bh->b_private = NULL;
	69	bd->bd_blkno = bh->b_blocknr;
d6a079e8	70	gfs2_log_lock(sdp);
1ad38c43 SW	71	gfs2_assert_withdraw(sdp, !buffer_busy(bh));
1ad38c43 SW	72	gfs2_trans_add_revoke(sdp, bd);
d6a079e8 DC	73	gfs2_log_unlock(sdp);
	74
	75	spin_lock(&sdp->sd_ail_lock);
ddacfaf7 SW	76	}
ddacfaf7 SW	77	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
d6a079e8	78	spin_unlock(&sdp->sd_ail_lock);
ddacfaf7 SW	79
	80	gfs2_trans_end(sdp);
	81	gfs2_log_flush(sdp, NULL);
	82	}
ba7f7290 SW	83
ba7f7290 SW	84	/**
6bac243f	85	* rgrp_go_sync - sync out the metadata for this glock
b3b94faa	86	* @gl: the glock
b3b94faa DT	87	*
	88	* Called when demoting or unlocking an EX glock. We must flush
	89	* to disk all dirty buffers/pages relating to this glock, and must not
	90	* not return to caller to demote/unlock the glock until I/O is complete.
	91	*/
	92
6bac243f	93	static void rgrp_go_sync(struct gfs2_glock *gl)
b3b94faa	94	{
009d8518	95	struct address_space *metamapping = gfs2_glock2aspace(gl);
6bac243f SW	96	int error;
	97
	98	if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
b5d32bea	99	return;
6bac243f	100	BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
b5d32bea	101
6bac243f SW	102	gfs2_log_flush(gl->gl_sbd, gl);
	103	filemap_fdatawrite(metamapping);
	104	error = filemap_fdatawait(metamapping);
	105	mapping_set_error(metamapping, error);
	106	gfs2_ail_empty_gl(gl);
b3b94faa DT	107	}
	108
	109	/**
6bac243f	110	* rgrp_go_inval - invalidate the metadata for this glock
b3b94faa DT	111	* @gl: the glock
	112	* @flags:
	113	*
6bac243f SW	114	* We never used LM_ST_DEFERRED with resource groups, so that we
	115	* should always see the metadata flag set here.
	116	*
b3b94faa DT	117	*/
b3b94faa DT	118
6bac243f	119	static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
b3b94faa	120	{
009d8518	121	struct address_space *mapping = gfs2_glock2aspace(gl);
b3b94faa	122
6bac243f SW	123	BUG_ON(!(flags & DIO_METADATA));
	124	gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
	125	truncate_inode_pages(mapping, 0);
cf45b752	126
6bac243f SW	127	if (gl->gl_object) {
6bac243f SW	128	struct gfs2_rgrpd rgd = (struct gfs2_rgrpd )gl->gl_object;
cf45b752 BP	129	rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
cf45b752 BP	130	}
b3b94faa DT	131	}
b3b94faa DT	132
b5d32bea SW	133	/**
	134	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	135	* @gl: the glock protecting the inode
	136	*
	137	*/
	138
	139	static void inode_go_sync(struct gfs2_glock *gl)
	140	{
	141	struct gfs2_inode *ip = gl->gl_object;
009d8518	142	struct address_space *metamapping = gfs2_glock2aspace(gl);
3042a2cc SW	143	int error;
3042a2cc SW	144
b5d32bea SW	145	if (ip && !S_ISREG(ip->i_inode.i_mode))
b5d32bea SW	146	ip = NULL;
6bac243f SW	147	if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
	148	unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
	149	if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
	150	return;
b5d32bea	151
6bac243f SW	152	BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
	153
	154	gfs2_log_flush(gl->gl_sbd, gl);
	155	filemap_fdatawrite(metamapping);
	156	if (ip) {
	157	struct address_space *mapping = ip->i_inode.i_mapping;
	158	filemap_fdatawrite(mapping);
	159	error = filemap_fdatawait(mapping);
	160	mapping_set_error(mapping, error);
b5d32bea	161	}
6bac243f SW	162	error = filemap_fdatawait(metamapping);
	163	mapping_set_error(metamapping, error);
	164	gfs2_ail_empty_gl(gl);
52fcd11c SW	165	/*
	166	* Writeback of the data mapping may cause the dirty flag to be set
	167	* so we have to clear it again here.
	168	*/
	169	smp_mb__before_clear_bit();
	170	clear_bit(GLF_DIRTY, &gl->gl_flags);
b5d32bea SW	171	}
b5d32bea SW	172
b3b94faa DT	173	/**
	174	* inode_go_inval - prepare a inode glock to be released
	175	* @gl: the glock
	176	* @flags:
6bac243f SW	177	*
	178	* Normally we invlidate everything, but if we are moving into
	179	* LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
	180	* can keep hold of the metadata, since it won't have changed.
b3b94faa DT	181	*
	182	*/
	183
	184	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	185	{
b004157a	186	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	187
6bac243f SW	188	gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
	189
	190	if (flags & DIO_METADATA) {
009d8518	191	struct address_space *mapping = gfs2_glock2aspace(gl);
6bac243f	192	truncate_inode_pages(mapping, 0);
c65f7fb5	193	if (ip) {
b004157a	194	set_bit(GIF_INVALID, &ip->i_flags);
c65f7fb5 SW	195	forget_all_cached_acls(&ip->i_inode);
c65f7fb5 SW	196	}
b004157a SW	197	}
b004157a SW	198
6bac243f SW	199	if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
6bac243f SW	200	gl->gl_sbd->sd_rindex_uptodate = 0;
3cc3f710	201	if (ip && S_ISREG(ip->i_inode.i_mode))
b004157a	202	truncate_inode_pages(ip->i_inode.i_mapping, 0);
b3b94faa DT	203	}
	204
	205	/**
	206	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	207	* @gl: the glock
	208	*
	209	* Returns: 1 if it's ok
	210	*/
	211
97cc1025	212	static int inode_go_demote_ok(const struct gfs2_glock *gl)
b3b94faa DT	213	{
b3b94faa DT	214	struct gfs2_sbd *sdp = gl->gl_sbd;
bc015cb8 SW	215	struct gfs2_holder *gh;
bc015cb8 SW	216
97cc1025 SW	217	if (sdp->sd_jindex == gl->gl_object \|\| sdp->sd_rindex == gl->gl_object)
97cc1025 SW	218	return 0;
bc015cb8 SW	219
	220	if (!list_empty(&gl->gl_holders)) {
	221	gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
	222	if (gh->gh_list.next != &gl->gl_holders)
	223	return 0;
	224	}
	225
97cc1025	226	return 1;
b3b94faa DT	227	}
	228
	229	/**
	230	* inode_go_lock - operation done after an inode lock is locked by a process
	231	* @gl: the glock
	232	* @flags:
	233	*
	234	* Returns: errno
	235	*/
	236
	237	static int inode_go_lock(struct gfs2_holder *gh)
	238	{
	239	struct gfs2_glock *gl = gh->gh_gl;
813e0c46	240	struct gfs2_sbd *sdp = gl->gl_sbd;
5c676f6d	241	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	242	int error = 0;
b3b94faa DT	243
091806ed	244	if (!ip \|\| (gh->gh_flags & GL_SKIP))
b3b94faa DT	245	return 0;
b3b94faa DT	246
bfded27b	247	if (test_bit(GIF_INVALID, &ip->i_flags)) {
b3b94faa DT	248	error = gfs2_inode_refresh(ip);
	249	if (error)
	250	return error;
b3b94faa DT	251	}
b3b94faa DT	252
383f01fb	253	if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
b3b94faa	254	(gl->gl_state == LM_ST_EXCLUSIVE) &&
813e0c46 SW	255	(gh->gh_state == LM_ST_EXCLUSIVE)) {
	256	spin_lock(&sdp->sd_trunc_lock);
	257	if (list_empty(&ip->i_trunc_list))
	258	list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
	259	spin_unlock(&sdp->sd_trunc_lock);
	260	wake_up(&sdp->sd_quota_wait);
	261	return 1;
	262	}
b3b94faa DT	263
	264	return error;
	265	}
	266
6802e340 SW	267	/**
	268	* inode_go_dump - print information about an inode
	269	* @seq: The iterator
	270	* @ip: the inode
	271	*
	272	* Returns: 0 on success, -ENOBUFS when we run out of space
	273	*/
	274
	275	static int inode_go_dump(struct seq_file seq, const struct gfs2_glock gl)
	276	{
	277	const struct gfs2_inode *ip = gl->gl_object;
	278	if (ip == NULL)
	279	return 0;
a2e0f799	280	gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
6802e340 SW	281	(unsigned long long)ip->i_no_formal_ino,
6802e340 SW	282	(unsigned long long)ip->i_no_addr,
fa75cedc SW	283	IF2DT(ip->i_inode.i_mode), ip->i_flags,
fa75cedc SW	284	(unsigned int)ip->i_diskflags,
a2e0f799	285	(unsigned long long)i_size_read(&ip->i_inode));
6802e340 SW	286	return 0;
	287	}
	288
b3b94faa DT	289	/**
	290	* rgrp_go_lock - operation done after an rgrp lock is locked by
	291	* a first holder on this node.
	292	* @gl: the glock
	293	* @flags:
	294	*
	295	* Returns: errno
	296	*/
	297
	298	static int rgrp_go_lock(struct gfs2_holder *gh)
	299	{
5c676f6d	300	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	301	}
	302
	303	/**
	304	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	305	* a last holder on this node.
	306	* @gl: the glock
	307	* @flags:
	308	*
	309	*/
	310
	311	static void rgrp_go_unlock(struct gfs2_holder *gh)
	312	{
5c676f6d	313	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	314	}
	315
	316	/**
3042a2cc	317	* trans_go_sync - promote/demote the transaction glock
b3b94faa DT	318	* @gl: the glock
	319	* @state: the requested state
	320	* @flags:
	321	*
	322	*/
	323
3042a2cc	324	static void trans_go_sync(struct gfs2_glock *gl)
b3b94faa DT	325	{
	326	struct gfs2_sbd *sdp = gl->gl_sbd;
	327
	328	if (gl->gl_state != LM_ST_UNLOCKED &&
	329	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	330	gfs2_meta_syncfs(sdp);
	331	gfs2_log_shutdown(sdp);
	332	}
b3b94faa DT	333	}
	334
	335	/**
	336	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	337	* @gl: the glock
	338	*
	339	*/
	340
6802e340	341	static int trans_go_xmote_bh(struct gfs2_glock gl, struct gfs2_holder gh)
b3b94faa DT	342	{
b3b94faa DT	343	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	344	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	345	struct gfs2_glock *j_gl = ip->i_gl;
55167622	346	struct gfs2_log_header_host head;
b3b94faa DT	347	int error;
b3b94faa DT	348
6802e340	349	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
1a14d3a6	350	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
b3b94faa DT	351
	352	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	353	if (error)
	354	gfs2_consist(sdp);
	355	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	356	gfs2_consist(sdp);
	357
	358	/* Initialize some head of the log stuff */
	359	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	360	sdp->sd_log_sequence = head.lh_sequence + 1;
	361	gfs2_log_pointers_init(sdp, head.lh_blkno);
	362	}
	363	}
6802e340	364	return 0;
b3b94faa DT	365	}
b3b94faa DT	366
97cc1025 SW	367	/**
	368	* trans_go_demote_ok
	369	* @gl: the glock
	370	*
	371	* Always returns 0
	372	*/
	373
	374	static int trans_go_demote_ok(const struct gfs2_glock *gl)
	375	{
	376	return 0;
	377	}
	378
b94a170e BM	379	/**
	380	* iopen_go_callback - schedule the dcache entry for the inode to be deleted
	381	* @gl: the glock
	382	*
	383	* gl_spin lock is held while calling this
	384	*/
	385	static void iopen_go_callback(struct gfs2_glock *gl)
	386	{
	387	struct gfs2_inode ip = (struct gfs2_inode )gl->gl_object;
	388
	389	if (gl->gl_demote_state == LM_ST_UNLOCKED &&
009d8518	390	gl->gl_state == LM_ST_SHARED && ip) {
b94a170e BM	391	gfs2_glock_hold(gl);
	392	if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
	393	gfs2_glock_put_nolock(gl);
	394	}
	395	}
	396
8fb4b536	397	const struct gfs2_glock_operations gfs2_meta_glops = {
ea67eedb	398	.go_type = LM_TYPE_META,
b3b94faa DT	399	};
b3b94faa DT	400
8fb4b536	401	const struct gfs2_glock_operations gfs2_inode_glops = {
3042a2cc	402	.go_xmote_th = inode_go_sync,
b3b94faa DT	403	.go_inval = inode_go_inval,
	404	.go_demote_ok = inode_go_demote_ok,
	405	.go_lock = inode_go_lock,
6802e340	406	.go_dump = inode_go_dump,
ea67eedb	407	.go_type = LM_TYPE_INODE,
6802e340	408	.go_min_hold_time = HZ / 5,
009d8518	409	.go_flags = GLOF_ASPACE,
b3b94faa DT	410	};
b3b94faa DT	411
8fb4b536	412	const struct gfs2_glock_operations gfs2_rgrp_glops = {
6bac243f SW	413	.go_xmote_th = rgrp_go_sync,
6bac243f SW	414	.go_inval = rgrp_go_inval,
b3b94faa DT	415	.go_lock = rgrp_go_lock,
b3b94faa DT	416	.go_unlock = rgrp_go_unlock,
09010978	417	.go_dump = gfs2_rgrp_dump,
ea67eedb	418	.go_type = LM_TYPE_RGRP,
6802e340	419	.go_min_hold_time = HZ / 5,
009d8518	420	.go_flags = GLOF_ASPACE,
b3b94faa DT	421	};
b3b94faa DT	422
8fb4b536	423	const struct gfs2_glock_operations gfs2_trans_glops = {
3042a2cc	424	.go_xmote_th = trans_go_sync,
b3b94faa	425	.go_xmote_bh = trans_go_xmote_bh,
97cc1025	426	.go_demote_ok = trans_go_demote_ok,
ea67eedb	427	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	428	};
b3b94faa DT	429
8fb4b536	430	const struct gfs2_glock_operations gfs2_iopen_glops = {
ea67eedb	431	.go_type = LM_TYPE_IOPEN,
b94a170e	432	.go_callback = iopen_go_callback,
b3b94faa DT	433	};
b3b94faa DT	434
8fb4b536	435	const struct gfs2_glock_operations gfs2_flock_glops = {
ea67eedb	436	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	437	};
b3b94faa DT	438
8fb4b536	439	const struct gfs2_glock_operations gfs2_nondisk_glops = {
ea67eedb	440	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	441	};
b3b94faa DT	442
8fb4b536	443	const struct gfs2_glock_operations gfs2_quota_glops = {
ea67eedb	444	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	445	};
b3b94faa DT	446
8fb4b536	447	const struct gfs2_glock_operations gfs2_journal_glops = {
ea67eedb	448	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	449	};
b3b94faa DT	450
64d576ba SW	451	const struct gfs2_glock_operations *gfs2_glops_list[] = {
	452	[LM_TYPE_META] = &gfs2_meta_glops,
	453	[LM_TYPE_INODE] = &gfs2_inode_glops,
	454	[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
64d576ba SW	455	[LM_TYPE_IOPEN] = &gfs2_iopen_glops,
	456	[LM_TYPE_FLOCK] = &gfs2_flock_glops,
	457	[LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
	458	[LM_TYPE_QUOTA] = &gfs2_quota_glops,
	459	[LM_TYPE_JOURNAL] = &gfs2_journal_glops,
	460	};
	461