[mirror_ubuntu-artful-kernel.git] / fs / gfs2 / glops.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License 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"


/**
 * 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_wait - Wait for writeback of data
 * @gl: the glock
 *
 * Syncs data (not metadata) for a regular file.
 * No-op for all other types.
 */

static void gfs2_page_wait(struct gfs2_glock *gl)
{
	struct gfs2_inode *ip = gl->gl_object;
	struct inode *inode = &ip->i_inode;
	struct address_space *mapping = inode->i_mapping;
	int error;

	if (!S_ISREG(ip->i_di.di_mode))
		return;

	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);

}

static void gfs2_page_writeback(struct gfs2_glock *gl)
{
	struct gfs2_inode *ip = gl->gl_object;
	struct inode *inode = &ip->i_inode;
	struct address_space *mapping = inode->i_mapping;

	if (!S_ISREG(ip->i_di.di_mode))
		return;

	filemap_fdatawrite(mapping);
}

/**
 * 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);
		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, 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
 * @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_writeback(gl);
			gfs2_log_flush(gl->gl_sbd, gl);
			gfs2_meta_sync(gl);
			gfs2_page_wait(gl);
			clear_bit(GLF_DIRTY, &gl->gl_flags);
		} else if (meta) {
			gfs2_log_flush(gl->gl_sbd, gl);
			gfs2_meta_sync(gl);
		} else if (data) {
			gfs2_page_writeback(gl);
			gfs2_page_wait(gl);
		}
		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 == NULL)
		return;
	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_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"
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	/**
7276b3b0	80	* gfs2_page_wait - Wait for writeback of data
ba7f7290	81	* @gl: the glock
ba7f7290 SW	82	*
	83	* Syncs data (not metadata) for a regular file.
	84	* No-op for all other types.
	85	*/
	86
7276b3b0	87	static void gfs2_page_wait(struct gfs2_glock *gl)
ba7f7290	88	{
7276b3b0 SW	89	struct gfs2_inode *ip = gl->gl_object;
	90	struct inode *inode = &ip->i_inode;
	91	struct address_space *mapping = inode->i_mapping;
	92	int error;
ba7f7290	93
7276b3b0	94	if (!S_ISREG(ip->i_di.di_mode))
ba7f7290 SW	95	return;
ba7f7290 SW	96
7276b3b0	97	error = filemap_fdatawait(mapping);
ba7f7290 SW	98
	99	/* Put back any errors cleared by filemap_fdatawait()
	100	so they can be caught by someone who can pass them
	101	up to user space. */
	102
	103	if (error == -ENOSPC)
	104	set_bit(AS_ENOSPC, &mapping->flags);
	105	else if (error)
	106	set_bit(AS_EIO, &mapping->flags);
	107
	108	}
	109
7276b3b0 SW	110	static void gfs2_page_writeback(struct gfs2_glock *gl)
	111	{
	112	struct gfs2_inode *ip = gl->gl_object;
	113	struct inode *inode = &ip->i_inode;
	114	struct address_space *mapping = inode->i_mapping;
	115
	116	if (!S_ISREG(ip->i_di.di_mode))
	117	return;
	118
	119	filemap_fdatawrite(mapping);
	120	}
	121
b3b94faa DT	122	/**
	123	* meta_go_sync - sync out the metadata for this glock
	124	* @gl: the glock
	125	* @flags: DIO_*
	126	*
	127	* Called when demoting or unlocking an EX glock. We must flush
	128	* to disk all dirty buffers/pages relating to this glock, and must not
	129	* not return to caller to demote/unlock the glock until I/O is complete.
	130	*/
	131
	132	static void meta_go_sync(struct gfs2_glock *gl, int flags)
	133	{
	134	if (!(flags & DIO_METADATA))
	135	return;
	136
	137	if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
b09e593d	138	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0	139	gfs2_meta_sync(gl);
b3b94faa DT	140	if (flags & DIO_RELEASE)
	141	gfs2_ail_empty_gl(gl);
	142	}
	143
b3b94faa DT	144	}
	145
	146	/**
	147	* meta_go_inval - invalidate the metadata for this glock
	148	* @gl: the glock
	149	* @flags:
	150	*
	151	*/
	152
	153	static void meta_go_inval(struct gfs2_glock *gl, int flags)
	154	{
	155	if (!(flags & DIO_METADATA))
	156	return;
	157
	158	gfs2_meta_inval(gl);
	159	gl->gl_vn++;
	160	}
	161
b3b94faa DT	162	/**
	163	* inode_go_xmote_th - promote/demote a glock
	164	* @gl: the glock
	165	* @state: the requested state
	166	* @flags:
	167	*
	168	*/
	169
	170	static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	171	int flags)
	172	{
	173	if (gl->gl_state != LM_ST_UNLOCKED)
	174	gfs2_pte_inval(gl);
	175	gfs2_glock_xmote_th(gl, state, flags);
	176	}
	177
	178	/**
	179	* inode_go_xmote_bh - After promoting/demoting a glock
	180	* @gl: the glock
	181	*
	182	*/
	183
	184	static void inode_go_xmote_bh(struct gfs2_glock *gl)
	185	{
	186	struct gfs2_holder *gh = gl->gl_req_gh;
	187	struct buffer_head *bh;
	188	int error;
	189
	190	if (gl->gl_state != LM_ST_UNLOCKED &&
	191	(!gh \|\| !(gh->gh_flags & GL_SKIP))) {
7276b3b0	192	error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
b3b94faa DT	193	if (!error)
	194	brelse(bh);
	195	}
	196	}
	197
	198	/**
	199	* inode_go_drop_th - unlock a glock
	200	* @gl: the glock
	201	*
	202	* Invoked from rq_demote().
	203	* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
	204	* is being purged from our node's glock cache; we're dropping lock.
	205	*/
	206
	207	static void inode_go_drop_th(struct gfs2_glock *gl)
	208	{
	209	gfs2_pte_inval(gl);
	210	gfs2_glock_drop_th(gl);
	211	}
	212
	213	/**
	214	* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
	215	* @gl: the glock protecting the inode
	216	* @flags:
	217	*
	218	*/
	219
	220	static void inode_go_sync(struct gfs2_glock *gl, int flags)
	221	{
	222	int meta = (flags & DIO_METADATA);
	223	int data = (flags & DIO_DATA);
	224
	225	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
	226	if (meta && data) {
7276b3b0	227	gfs2_page_writeback(gl);
b09e593d	228	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0 SW	229	gfs2_meta_sync(gl);
7276b3b0 SW	230	gfs2_page_wait(gl);
b3b94faa DT	231	clear_bit(GLF_DIRTY, &gl->gl_flags);
b3b94faa DT	232	} else if (meta) {
b09e593d	233	gfs2_log_flush(gl->gl_sbd, gl);
7276b3b0 SW	234	gfs2_meta_sync(gl);
	235	} else if (data) {
	236	gfs2_page_writeback(gl);
	237	gfs2_page_wait(gl);
	238	}
b3b94faa DT	239	if (flags & DIO_RELEASE)
	240	gfs2_ail_empty_gl(gl);
	241	}
b3b94faa DT	242	}
	243
	244	/**
	245	* inode_go_inval - prepare a inode glock to be released
	246	* @gl: the glock
	247	* @flags:
	248	*
	249	*/
	250
	251	static void inode_go_inval(struct gfs2_glock *gl, int flags)
	252	{
	253	int meta = (flags & DIO_METADATA);
	254	int data = (flags & DIO_DATA);
	255
	256	if (meta) {
	257	gfs2_meta_inval(gl);
	258	gl->gl_vn++;
	259	}
	260	if (data)
	261	gfs2_page_inval(gl);
	262	}
	263
	264	/**
	265	* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
	266	* @gl: the glock
	267	*
	268	* Returns: 1 if it's ok
	269	*/
	270
	271	static int inode_go_demote_ok(struct gfs2_glock *gl)
	272	{
	273	struct gfs2_sbd *sdp = gl->gl_sbd;
	274	int demote = 0;
	275
5c676f6d	276	if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
b3b94faa DT	277	demote = 1;
	278	else if (!sdp->sd_args.ar_localcaching &&
	279	time_after_eq(jiffies, gl->gl_stamp +
	280	gfs2_tune_get(sdp, gt_demote_secs) * HZ))
	281	demote = 1;
	282
	283	return demote;
	284	}
	285
	286	/**
	287	* inode_go_lock - operation done after an inode lock is locked by a process
	288	* @gl: the glock
	289	* @flags:
	290	*
	291	* Returns: errno
	292	*/
	293
	294	static int inode_go_lock(struct gfs2_holder *gh)
	295	{
	296	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	297	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	298	int error = 0;
	299
	300	if (!ip)
	301	return 0;
	302
	303	if (ip->i_vn != gl->gl_vn) {
	304	error = gfs2_inode_refresh(ip);
	305	if (error)
	306	return error;
	307	gfs2_inode_attr_in(ip);
	308	}
	309
	310	if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
	311	(gl->gl_state == LM_ST_EXCLUSIVE) &&
	312	(gh->gh_flags & GL_LOCAL_EXCL))
	313	error = gfs2_truncatei_resume(ip);
	314
	315	return error;
	316	}
	317
	318	/**
	319	* inode_go_unlock - operation done before an inode lock is unlocked by a
	320	* process
	321	* @gl: the glock
	322	* @flags:
	323	*
	324	*/
	325
	326	static void inode_go_unlock(struct gfs2_holder *gh)
	327	{
	328	struct gfs2_glock *gl = gh->gh_gl;
5c676f6d	329	struct gfs2_inode *ip = gl->gl_object;
b3b94faa	330
75d3b817 SW	331	if (ip == NULL)
	332	return;
	333	if (test_bit(GLF_DIRTY, &gl->gl_flags))
	334	gfs2_inode_attr_in(ip);
	335	gfs2_meta_cache_flush(ip);
b3b94faa DT	336	}
	337
	338	/**
	339	* inode_greedy -
	340	* @gl: the glock
	341	*
	342	*/
	343
	344	static void inode_greedy(struct gfs2_glock *gl)
	345	{
	346	struct gfs2_sbd *sdp = gl->gl_sbd;
5c676f6d	347	struct gfs2_inode *ip = gl->gl_object;
b3b94faa DT	348	unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
	349	unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
	350	unsigned int new_time;
	351
	352	spin_lock(&ip->i_spin);
	353
	354	if (time_after(ip->i_last_pfault + quantum, jiffies)) {
	355	new_time = ip->i_greedy + quantum;
	356	if (new_time > max)
	357	new_time = max;
	358	} else {
	359	new_time = ip->i_greedy - quantum;
	360	if (!new_time \|\| new_time > max)
	361	new_time = 1;
	362	}
	363
	364	ip->i_greedy = new_time;
	365
	366	spin_unlock(&ip->i_spin);
	367
feaa7bba	368	iput(&ip->i_inode);
b3b94faa DT	369	}
	370
	371	/**
	372	* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
	373	* @gl: the glock
	374	*
	375	* Returns: 1 if it's ok
	376	*/
	377
	378	static int rgrp_go_demote_ok(struct gfs2_glock *gl)
	379	{
	380	return !gl->gl_aspace->i_mapping->nrpages;
	381	}
	382
	383	/**
	384	* rgrp_go_lock - operation done after an rgrp lock is locked by
	385	* a first holder on this node.
	386	* @gl: the glock
	387	* @flags:
	388	*
	389	* Returns: errno
	390	*/
	391
	392	static int rgrp_go_lock(struct gfs2_holder *gh)
	393	{
5c676f6d	394	return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
b3b94faa DT	395	}
	396
	397	/**
	398	* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
	399	* a last holder on this node.
	400	* @gl: the glock
	401	* @flags:
	402	*
	403	*/
	404
	405	static void rgrp_go_unlock(struct gfs2_holder *gh)
	406	{
5c676f6d	407	gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
b3b94faa DT	408	}
	409
	410	/**
	411	* trans_go_xmote_th - promote/demote the transaction glock
	412	* @gl: the glock
	413	* @state: the requested state
	414	* @flags:
	415	*
	416	*/
	417
	418	static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
	419	int flags)
	420	{
	421	struct gfs2_sbd *sdp = gl->gl_sbd;
	422
	423	if (gl->gl_state != LM_ST_UNLOCKED &&
	424	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	425	gfs2_meta_syncfs(sdp);
	426	gfs2_log_shutdown(sdp);
	427	}
	428
	429	gfs2_glock_xmote_th(gl, state, flags);
	430	}
	431
	432	/**
	433	* trans_go_xmote_bh - After promoting/demoting the transaction glock
	434	* @gl: the glock
	435	*
	436	*/
	437
	438	static void trans_go_xmote_bh(struct gfs2_glock *gl)
	439	{
	440	struct gfs2_sbd *sdp = gl->gl_sbd;
feaa7bba	441	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d	442	struct gfs2_glock *j_gl = ip->i_gl;
b3b94faa DT	443	struct gfs2_log_header head;
	444	int error;
	445
	446	if (gl->gl_state != LM_ST_UNLOCKED &&
	447	test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
feaa7bba	448	gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
b3b94faa DT	449	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA \| DIO_DATA);
	450
	451	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
	452	if (error)
	453	gfs2_consist(sdp);
	454	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
	455	gfs2_consist(sdp);
	456
	457	/* Initialize some head of the log stuff */
	458	if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
	459	sdp->sd_log_sequence = head.lh_sequence + 1;
	460	gfs2_log_pointers_init(sdp, head.lh_blkno);
	461	}
	462	}
	463	}
	464
	465	/**
	466	* trans_go_drop_th - unlock the transaction glock
	467	* @gl: the glock
	468	*
	469	* We want to sync the device even with localcaching. Remember
	470	* that localcaching journal replay only marks buffers dirty.
	471	*/
	472
	473	static void trans_go_drop_th(struct gfs2_glock *gl)
	474	{
	475	struct gfs2_sbd *sdp = gl->gl_sbd;
	476
	477	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
	478	gfs2_meta_syncfs(sdp);
	479	gfs2_log_shutdown(sdp);
	480	}
	481
	482	gfs2_glock_drop_th(gl);
	483	}
	484
	485	/**
	486	* quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
	487	* @gl: the glock
	488	*
	489	* Returns: 1 if it's ok
	490	*/
	491
	492	static int quota_go_demote_ok(struct gfs2_glock *gl)
	493	{
	494	return !atomic_read(&gl->gl_lvb_count);
	495	}
	496
8fb4b536	497	const struct gfs2_glock_operations gfs2_meta_glops = {
b3b94faa DT	498	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	499	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	500	.go_type = LM_TYPE_META,
b3b94faa DT	501	};
b3b94faa DT	502
8fb4b536	503	const struct gfs2_glock_operations gfs2_inode_glops = {
b3b94faa DT	504	.go_xmote_th = inode_go_xmote_th,
	505	.go_xmote_bh = inode_go_xmote_bh,
	506	.go_drop_th = inode_go_drop_th,
	507	.go_sync = inode_go_sync,
	508	.go_inval = inode_go_inval,
	509	.go_demote_ok = inode_go_demote_ok,
	510	.go_lock = inode_go_lock,
	511	.go_unlock = inode_go_unlock,
	512	.go_greedy = inode_greedy,
ea67eedb	513	.go_type = LM_TYPE_INODE,
b3b94faa DT	514	};
b3b94faa DT	515
8fb4b536	516	const struct gfs2_glock_operations gfs2_rgrp_glops = {
b3b94faa DT	517	.go_xmote_th = gfs2_glock_xmote_th,
	518	.go_drop_th = gfs2_glock_drop_th,
	519	.go_sync = meta_go_sync,
	520	.go_inval = meta_go_inval,
	521	.go_demote_ok = rgrp_go_demote_ok,
	522	.go_lock = rgrp_go_lock,
	523	.go_unlock = rgrp_go_unlock,
ea67eedb	524	.go_type = LM_TYPE_RGRP,
b3b94faa DT	525	};
b3b94faa DT	526
8fb4b536	527	const struct gfs2_glock_operations gfs2_trans_glops = {
b3b94faa DT	528	.go_xmote_th = trans_go_xmote_th,
	529	.go_xmote_bh = trans_go_xmote_bh,
	530	.go_drop_th = trans_go_drop_th,
ea67eedb	531	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	532	};
b3b94faa DT	533
8fb4b536	534	const struct gfs2_glock_operations gfs2_iopen_glops = {
b3b94faa DT	535	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	536	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	537	.go_type = LM_TYPE_IOPEN,
b3b94faa DT	538	};
b3b94faa DT	539
8fb4b536	540	const struct gfs2_glock_operations gfs2_flock_glops = {
b3b94faa DT	541	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	542	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	543	.go_type = LM_TYPE_FLOCK,
b3b94faa DT	544	};
b3b94faa DT	545
8fb4b536	546	const struct gfs2_glock_operations gfs2_nondisk_glops = {
b3b94faa DT	547	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	548	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	549	.go_type = LM_TYPE_NONDISK,
b3b94faa DT	550	};
b3b94faa DT	551
8fb4b536	552	const struct gfs2_glock_operations gfs2_quota_glops = {
b3b94faa DT	553	.go_xmote_th = gfs2_glock_xmote_th,
	554	.go_drop_th = gfs2_glock_drop_th,
	555	.go_demote_ok = quota_go_demote_ok,
ea67eedb	556	.go_type = LM_TYPE_QUOTA,
b3b94faa DT	557	};
b3b94faa DT	558
8fb4b536	559	const struct gfs2_glock_operations gfs2_journal_glops = {
b3b94faa DT	560	.go_xmote_th = gfs2_glock_xmote_th,
b3b94faa DT	561	.go_drop_th = gfs2_glock_drop_th,
ea67eedb	562	.go_type = LM_TYPE_JOURNAL,
b3b94faa DT	563	};
b3b94faa DT	564