[people/ms/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/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.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;

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

	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);

}

/**
 * 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 (gl->gl_state != LM_ST_EXCLUSIVE)
		return;

	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);
	if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
		gl->gl_sbd->sd_rindex_uptodate = 0;
	else if (gl->gl_ops == &gfs2_rgrp_glops && 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 = gl->gl_aspace->i_mapping;
	int error;

	if (gl->gl_state != LM_ST_UNLOCKED)
		gfs2_pte_inval(gl);
	if (gl->gl_state != LM_ST_EXCLUSIVE)
		return;

	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);
		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);
		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);
}

/**
 * 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;
	if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
		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/%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)ip->i_inode.i_size,
		  (unsigned long long)ip->i_disksize);
	return 0;
}

/**
 * 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(const 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);
}

/**
 * rgrp_go_dump - print out an rgrp
 * @seq: The iterator
 * @gl: The glock in question
 *
 */

static int rgrp_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
{
	const struct gfs2_rgrpd *rgd = gl->gl_object;
	if (rgd == NULL)
		return 0;
	gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
		       (unsigned long long)rgd->rd_addr, rgd->rd_flags,
		       rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
	return 0;
}

/**
 * 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;
}

const struct gfs2_glock_operations gfs2_meta_glops = {
	.go_xmote_th = meta_go_sync,
	.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,
};

const struct gfs2_glock_operations gfs2_rgrp_glops = {
	.go_xmote_th = 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_dump = rgrp_go_dump,
	.go_type = LM_TYPE_RGRP,
	.go_min_hold_time = HZ / 5,
};

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,
};

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_NONDISK] = &gfs2_trans_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/slab.h>
	11	#include <linux/spinlock.h>
	12	#include <linux/completion.h>
	13	#include <linux/buffer_head.h>
5c676f6d	14	#include <linux/gfs2_ondisk.h>
6802e340	15	#include <linux/bio.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
ddacfaf7 SW	59	gfs2_log_lock(sdp);
	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);
1ad38c43 SW	65	bd->bd_bh = NULL;
	66	bh->b_private = NULL;
	67	bd->bd_blkno = bh->b_blocknr;
	68	gfs2_assert_withdraw(sdp, !buffer_busy(bh));
	69	gfs2_trans_add_revoke(sdp, bd);
ddacfaf7 SW	70	}
	71	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
	72	gfs2_log_unlock(sdp);
	73
	74	gfs2_trans_end(sdp);
	75	gfs2_log_flush(sdp, NULL);
	76	}
ba7f7290 SW	77
	78	/**
	79	* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
	80	* @gl: the glock
	81	*
	82	*/
	83
	84	static void gfs2_pte_inval(struct gfs2_glock *gl)
	85	{
	86	struct gfs2_inode *ip;
	87	struct inode *inode;
	88
	89	ip = gl->gl_object;
	90	inode = &ip->i_inode;
b60623c2	91	if (!ip \|\| !S_ISREG(inode->i_mode))
ba7f7290 SW	92	return;
ba7f7290 SW	93
ba7f7290	94	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
ba7f7290 SW	95	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
	96	set_bit(GLF_DIRTY, &gl->gl_flags);
	97
ba7f7290 SW	98	}
ba7f7290 SW	99
b3b94faa DT	100	/**
	101	* meta_go_sync - sync out the metadata for this glock
	102	* @gl: the glock
b3b94faa DT	103	*
	104	* Called when demoting or unlocking an EX glock. We must flush
	105	* to disk all dirty buffers/pages relating to this glock, and must not
	106	* not return to caller to demote/unlock the glock until I/O is complete.
	107	*/
	108
1a14d3a6	109	static void meta_go_sync(struct gfs2_glock *gl)
b3b94faa	110	{
b5d32bea SW	111	if (gl->gl_state != LM_ST_EXCLUSIVE)
	112	return;
	113
b3b94faa	114	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	115	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0	116	gfs2_meta_sync(gl);
1a14d3a6	117	gfs2_ail_empty_gl(gl);
b3b94faa	118	}
b3b94faa DT	119	}
	120
	121	/**
	122	* meta_go_inval - invalidate the metadata for this glock
	123	* @gl: the glock
	124	* @flags:
	125	*
	126	*/
	127
	128	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	129	{
	130	if (!(flags & DIO_METADATA))
	131	return;
	132
	133	gfs2_meta_inval(gl);
cf45b752 BP	134	if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
	135	gl->gl_sbd->sd_rindex_uptodate = 0;
	136	else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
	137	struct gfs2_rgrpd rgd = (struct gfs2_rgrpd )gl->gl_object;
	138
	139	rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
	140	}
b3b94faa DT	141	}
b3b94faa DT	142
b5d32bea SW	143	/**
	144	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	145	* @gl: the glock protecting the inode
	146	*
	147	*/
	148
	149	static void inode_go_sync(struct gfs2_glock *gl)
	150	{
	151	struct gfs2_inode *ip = gl->gl_object;
3042a2cc SW	152	struct address_space *metamapping = gl->gl_aspace->i_mapping;
	153	int error;
	154
	155	if (gl->gl_state != LM_ST_UNLOCKED)
	156	gfs2_pte_inval(gl);
	157	if (gl->gl_state != LM_ST_EXCLUSIVE)
	158	return;
b5d32bea SW	159
	160	if (ip && !S_ISREG(ip->i_inode.i_mode))
	161	ip = NULL;
	162
	163	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
b524fe64	164	gfs2_log_flush(gl->gl_sbd, gl);
3042a2cc	165	filemap_fdatawrite(metamapping);
b5d32bea SW	166	if (ip) {
b5d32bea SW	167	struct address_space *mapping = ip->i_inode.i_mapping;
3042a2cc SW	168	filemap_fdatawrite(mapping);
3042a2cc SW	169	error = filemap_fdatawait(mapping);
3e9f45bd	170	mapping_set_error(mapping, error);
b5d32bea	171	}
3042a2cc SW	172	error = filemap_fdatawait(metamapping);
3042a2cc SW	173	mapping_set_error(metamapping, error);
b5d32bea SW	174	clear_bit(GLF_DIRTY, &gl->gl_flags);
	175	gfs2_ail_empty_gl(gl);
	176	}
	177	}
	178
b3b94faa DT	179	/**
	180	* inode_go_inval - prepare a inode glock to be released
	181	* @gl: the glock
	182	* @flags:
	183	*
	184	*/
	185
	186	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	187	{
b004157a	188	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	189	int meta = (flags & DIO_METADATA);
b3b94faa DT	190
	191	if (meta) {
	192	gfs2_meta_inval(gl);
b004157a SW	193	if (ip)
	194	set_bit(GIF_INVALID, &ip->i_flags);
	195	}
	196
3cc3f710	197	if (ip && S_ISREG(ip->i_inode.i_mode))
b004157a	198	truncate_inode_pages(ip->i_inode.i_mapping, 0);
b3b94faa DT	199	}
	200
	201	/**
	202	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	203	* @gl: the glock
	204	*
	205	* Returns: 1 if it's ok
	206	*/
	207
97cc1025	208	static int inode_go_demote_ok(const struct gfs2_glock *gl)
b3b94faa DT	209	{
b3b94faa DT	210	struct gfs2_sbd *sdp = gl->gl_sbd;
97cc1025 SW	211	if (sdp->sd_jindex == gl->gl_object \|\| sdp->sd_rindex == gl->gl_object)
	212	return 0;
	213	return 1;
b3b94faa DT	214	}
	215
	216	/**
	217	* inode_go_lock - operation done after an inode lock is locked by a process
	218	* @gl: the glock
	219	* @flags:
	220	*
	221	* Returns: errno
	222	*/
	223
	224	static int inode_go_lock(struct gfs2_holder *gh)
	225	{
	226	struct gfs2_glock *gl = gh->gh_gl;
813e0c46	227	struct gfs2_sbd *sdp = gl->gl_sbd;
5c676f6d	228	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	229	int error = 0;
b3b94faa DT	230
091806ed	231	if (!ip \|\| (gh->gh_flags & GL_SKIP))
b3b94faa DT	232	return 0;
b3b94faa DT	233
bfded27b	234	if (test_bit(GIF_INVALID, &ip->i_flags)) {
b3b94faa DT	235	error = gfs2_inode_refresh(ip);
	236	if (error)
	237	return error;
b3b94faa DT	238	}
b3b94faa DT	239
383f01fb	240	if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
b3b94faa	241	(gl->gl_state == LM_ST_EXCLUSIVE) &&
813e0c46 SW	242	(gh->gh_state == LM_ST_EXCLUSIVE)) {
	243	spin_lock(&sdp->sd_trunc_lock);
	244	if (list_empty(&ip->i_trunc_list))
	245	list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
	246	spin_unlock(&sdp->sd_trunc_lock);
	247	wake_up(&sdp->sd_quota_wait);
	248	return 1;
	249	}
b3b94faa DT	250
	251	return error;
	252	}
	253
6802e340 SW	254	/**
	255	* inode_go_dump - print information about an inode
	256	* @seq: The iterator
	257	* @ip: the inode
	258	*
	259	* Returns: 0 on success, -ENOBUFS when we run out of space
	260	*/
	261
	262	static int inode_go_dump(struct seq_file seq, const struct gfs2_glock gl)
	263	{
	264	const struct gfs2_inode *ip = gl->gl_object;
	265	if (ip == NULL)
	266	return 0;
fa75cedc	267	gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu/%llu\n",
6802e340 SW	268	(unsigned long long)ip->i_no_formal_ino,
6802e340 SW	269	(unsigned long long)ip->i_no_addr,
fa75cedc SW	270	IF2DT(ip->i_inode.i_mode), ip->i_flags,
	271	(unsigned int)ip->i_diskflags,
	272	(unsigned long long)ip->i_inode.i_size,
	273	(unsigned long long)ip->i_disksize);
6802e340 SW	274	return 0;
	275	}
	276
b3b94faa DT	277	/**
	278	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	279	* @gl: the glock
	280	*
	281	* Returns: 1 if it's ok
	282	*/
	283
97cc1025	284	static int rgrp_go_demote_ok(const struct gfs2_glock *gl)
b3b94faa DT	285	{
	286	return !gl->gl_aspace->i_mapping->nrpages;
	287	}
	288
	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	}
b3b94faa DT	315
6802e340 SW	316	/**
	317	* rgrp_go_dump - print out an rgrp
	318	* @seq: The iterator
	319	* @gl: The glock in question
	320	*
	321	*/
	322
	323	static int rgrp_go_dump(struct seq_file seq, const struct gfs2_glock gl)
	324	{
	325	const struct gfs2_rgrpd *rgd = gl->gl_object;
	326	if (rgd == NULL)
	327	return 0;
fa75cedc SW	328	gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
	329	(unsigned long long)rgd->rd_addr, rgd->rd_flags,
	330	rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
6802e340 SW	331	return 0;
	332	}
	333
b3b94faa	334	/**
3042a2cc	335	* trans_go_sync - promote/demote the transaction glock
b3b94faa DT	336	* @gl: the glock
	337	* @state: the requested state
	338	* @flags:
	339	*
	340	*/
	341
3042a2cc	342	static void trans_go_sync(struct gfs2_glock *gl)
b3b94faa DT	343	{
	344	struct gfs2_sbd *sdp = gl->gl_sbd;
	345
	346	if (gl->gl_state != LM_ST_UNLOCKED &&
	347	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	348	gfs2_meta_syncfs(sdp);
	349	gfs2_log_shutdown(sdp);
	350	}
b3b94faa DT	351	}
	352
	353	/**
	354	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	355	* @gl: the glock
	356	*
	357	*/
	358
6802e340	359	static int trans_go_xmote_bh(struct gfs2_glock gl, struct gfs2_holder gh)
b3b94faa DT	360	{
b3b94faa DT	361	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	362	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	363	struct gfs2_glock *j_gl = ip->i_gl;
55167622	364	struct gfs2_log_header_host head;
b3b94faa DT	365	int error;
b3b94faa DT	366
6802e340	367	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
1a14d3a6	368	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
b3b94faa DT	369
	370	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	371	if (error)
	372	gfs2_consist(sdp);
	373	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	374	gfs2_consist(sdp);
	375
	376	/* Initialize some head of the log stuff */
	377	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	378	sdp->sd_log_sequence = head.lh_sequence + 1;
	379	gfs2_log_pointers_init(sdp, head.lh_blkno);
	380	}
	381	}
6802e340	382	return 0;
b3b94faa DT	383	}
b3b94faa DT	384
97cc1025 SW	385	/**
	386	* trans_go_demote_ok
	387	* @gl: the glock
	388	*
	389	* Always returns 0
	390	*/
	391
	392	static int trans_go_demote_ok(const struct gfs2_glock *gl)
	393	{
	394	return 0;
	395	}
	396
8fb4b536	397	const struct gfs2_glock_operations gfs2_meta_glops = {
b5d32bea	398	.go_xmote_th = meta_go_sync,
ea67eedb	399	.go_type = LM_TYPE_META,
b3b94faa DT	400	};
b3b94faa DT	401
8fb4b536	402	const struct gfs2_glock_operations gfs2_inode_glops = {
3042a2cc	403	.go_xmote_th = inode_go_sync,
b3b94faa DT	404	.go_inval = inode_go_inval,
	405	.go_demote_ok = inode_go_demote_ok,
	406	.go_lock = inode_go_lock,
6802e340	407	.go_dump = inode_go_dump,
ea67eedb	408	.go_type = LM_TYPE_INODE,
6802e340	409	.go_min_hold_time = HZ / 5,
b3b94faa DT	410	};
b3b94faa DT	411
8fb4b536	412	const struct gfs2_glock_operations gfs2_rgrp_glops = {
cad5b939	413	.go_xmote_th = meta_go_sync,
b3b94faa DT	414	.go_inval = meta_go_inval,
	415	.go_demote_ok = rgrp_go_demote_ok,
	416	.go_lock = rgrp_go_lock,
	417	.go_unlock = rgrp_go_unlock,
6802e340	418	.go_dump = rgrp_go_dump,
ea67eedb	419	.go_type = LM_TYPE_RGRP,
6802e340	420	.go_min_hold_time = HZ / 5,
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,
b3b94faa DT	432	};
b3b94faa DT	433
8fb4b536	434	const struct gfs2_glock_operations gfs2_flock_glops = {
ea67eedb	435	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	436	};
b3b94faa DT	437
8fb4b536	438	const struct gfs2_glock_operations gfs2_nondisk_glops = {
ea67eedb	439	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	440	};
b3b94faa DT	441
8fb4b536	442	const struct gfs2_glock_operations gfs2_quota_glops = {
ea67eedb	443	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	444	};
b3b94faa DT	445
8fb4b536	446	const struct gfs2_glock_operations gfs2_journal_glops = {
ea67eedb	447	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	448	};
b3b94faa DT	449
64d576ba SW	450	const struct gfs2_glock_operations *gfs2_glops_list[] = {
	451	[LM_TYPE_META] = &gfs2_meta_glops,
	452	[LM_TYPE_INODE] = &gfs2_inode_glops,
	453	[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
	454	[LM_TYPE_NONDISK] = &gfs2_trans_glops,
	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