[linux.git] / fs / gfs2 / util.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/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/crc32.h>
#include <linux/gfs2_ondisk.h>
#include <asm/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "util.h"

struct kmem_cache *gfs2_glock_cachep __read_mostly;
struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
struct kmem_cache *gfs2_inode_cachep __read_mostly;
struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
struct kmem_cache *gfs2_quotad_cachep __read_mostly;
struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
mempool_t *gfs2_page_pool __read_mostly;

void gfs2_assert_i(struct gfs2_sbd *sdp)
{
	printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
	       sdp->sd_fsname);
}

int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	const struct lm_lockops *lm = ls->ls_ops;
	va_list args;

	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
	    test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
		return 0;

	va_start(args, fmt);
	vprintk(fmt, args);
	va_end(args);

	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
		fs_err(sdp, "about to withdraw this file system\n");
		BUG_ON(sdp->sd_args.ar_debug);

		kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);

		if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
			wait_for_completion(&sdp->sd_wdack);

		if (lm->lm_unmount) {
			fs_err(sdp, "telling LM to unmount\n");
			lm->lm_unmount(sdp);
		}
		fs_err(sdp, "withdrawn\n");
		dump_stack();
	}

	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
		panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);

	return -1;
}

/**
 * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
 * Returns: -1 if this call withdrew the machine,
 *          -2 if it was already withdrawn
 */

int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
			   const char *function, char *file, unsigned int line)
{
	int me;
	me = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname, assertion,
		sdp->sd_fsname, function, file, line);
	dump_stack();
	return (me) ? -1 : -2;
}

/**
 * gfs2_assert_warn_i - Print a message to the console if @assertion is false
 * Returns: -1 if we printed something
 *          -2 if we didn't
 */

int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
		       const char *function, char *file, unsigned int line)
{
	if (time_before(jiffies,
			sdp->sd_last_warning +
			gfs2_tune_get(sdp, gt_complain_secs) * HZ))
		return -2;

	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
		printk(KERN_WARNING
		       "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
		       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		       sdp->sd_fsname, assertion,
		       sdp->sd_fsname, function, file, line);

	if (sdp->sd_args.ar_debug)
		BUG();
	else
		dump_stack();

	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
		panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
		      "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		      sdp->sd_fsname, assertion,
		      sdp->sd_fsname, function, file, line);

	sdp->sd_last_warning = jiffies;

	return -1;
}

/**
 * gfs2_consist_i - Flag a filesystem consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
		   char *file, unsigned int line)
{
	int rv;
	rv = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, function, file, line);
	return rv;
}

/**
 * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
			 const char *function, char *file, unsigned int line)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	int rv;
	rv = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
		"GFS2: fsid=%s:   inode = %llu %llu\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
		(unsigned long long)ip->i_no_addr,
		sdp->sd_fsname, function, file, line);
	return rv;
}

/**
 * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
			 const char *function, char *file, unsigned int line)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	int rv;
	rv = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: filesystem consistency error\n"
		"GFS2: fsid=%s:   RG = %llu\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
		sdp->sd_fsname, function, file, line);
	return rv;
}

/**
 * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          -2 if it was already withdrawn
 */

int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
		       const char *type, const char *function, char *file,
		       unsigned int line)
{
	int me;
	me = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: invalid metadata block\n"
		"GFS2: fsid=%s:   bh = %llu (%s)\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
		sdp->sd_fsname, function, file, line);
	return (me) ? -1 : -2;
}

/**
 * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          -2 if it was already withdrawn
 */

int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
			   u16 type, u16 t, const char *function,
			   char *file, unsigned int line)
{
	int me;
	me = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: invalid metadata block\n"
		"GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
		sdp->sd_fsname, function, file, line);
	return (me) ? -1 : -2;
}

/**
 * gfs2_io_error_i - Flag an I/O error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
		    unsigned int line)
{
	int rv;
	rv = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: I/O error\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, function, file, line);
	return rv;
}

/**
 * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
		       const char *function, char *file, unsigned int line)
{
	int rv;
	rv = gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: fatal: I/O error\n"
		"GFS2: fsid=%s:   block = %llu\n"
		"GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
		sdp->sd_fsname,
		sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
		sdp->sd_fsname, function, file, line);
	return rv;
}

void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
		      unsigned int bit, int new_value)
{
	unsigned int c, o, b = bit;
	int old_value;

	c = b / (8 * PAGE_SIZE);
	b %= 8 * PAGE_SIZE;
	o = b / 8;
	b %= 8;

	old_value = (bitmap[c][o] & (1 << b));
	gfs2_assert_withdraw(sdp, !old_value != !new_value);

	if (new_value)
		bitmap[c][o] |= 1 << b;
	else
		bitmap[c][o] &= ~(1 << b);
}
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	*/
b3b94faa DT	9
b3b94faa DT	10	#include <linux/spinlock.h>
	11	#include <linux/completion.h>
	12	#include <linux/buffer_head.h>
	13	#include <linux/crc32.h>
5c676f6d	14	#include <linux/gfs2_ondisk.h>
b3b94faa DT	15	#include <asm/uaccess.h>
	16
	17	#include "gfs2.h"
5c676f6d	18	#include "incore.h"
b3b94faa	19	#include "glock.h"
5c676f6d	20	#include "util.h"
b3b94faa	21
e18b890b	22	struct kmem_cache *gfs2_glock_cachep __read_mostly;
009d8518	23	struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
e18b890b CL	24	struct kmem_cache *gfs2_inode_cachep __read_mostly;
e18b890b CL	25	struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
6bdd9be6	26	struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
37b2c837	27	struct kmem_cache *gfs2_quotad_cachep __read_mostly;
36f5580b	28	struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
e8c92ed7	29	mempool_t *gfs2_page_pool __read_mostly;
b3b94faa	30
b3b94faa DT	31	void gfs2_assert_i(struct gfs2_sbd *sdp)
	32	{
	33	printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
	34	sdp->sd_fsname);
	35	}
	36
da755fdb SW	37	int gfs2_lm_withdraw(struct gfs2_sbd sdp, char fmt, ...)
da755fdb SW	38	{
f057f6cd SW	39	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
f057f6cd SW	40	const struct lm_lockops *lm = ls->ls_ops;
da755fdb SW	41	va_list args;
da755fdb SW	42
d34843d0 BP	43	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
d34843d0 BP	44	test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
da755fdb SW	45	return 0;
	46
	47	va_start(args, fmt);
	48	vprintk(fmt, args);
	49	va_end(args);
	50
d34843d0 BP	51	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
	52	fs_err(sdp, "about to withdraw this file system\n");
	53	BUG_ON(sdp->sd_args.ar_debug);
da755fdb	54
d34843d0	55	kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
f057f6cd	56
fd95e81c SW	57	if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
	58	wait_for_completion(&sdp->sd_wdack);
	59
d34843d0 BP	60	if (lm->lm_unmount) {
	61	fs_err(sdp, "telling LM to unmount\n");
	62	lm->lm_unmount(sdp);
	63	}
	64	fs_err(sdp, "withdrawn\n");
	65	dump_stack();
f057f6cd	66	}
d34843d0 BP	67
	68	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
	69	panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
da755fdb SW	70
	71	return -1;
	72	}
	73
b3b94faa DT	74	/**
	75	* gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
	76	* Returns: -1 if this call withdrew the machine,
	77	* -2 if it was already withdrawn
	78	*/
	79
	80	int gfs2_assert_withdraw_i(struct gfs2_sbd sdp, char assertion,
	81	const char function, char file, unsigned int line)
	82	{
	83	int me;
	84	me = gfs2_lm_withdraw(sdp,
	85	"GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
	86	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	87	sdp->sd_fsname, assertion,
	88	sdp->sd_fsname, function, file, line);
18ec7d5c	89	dump_stack();
b3b94faa DT	90	return (me) ? -1 : -2;
	91	}
	92
	93	/**
	94	* gfs2_assert_warn_i - Print a message to the console if @assertion is false
	95	* Returns: -1 if we printed something
	96	* -2 if we didn't
	97	*/
	98
	99	int gfs2_assert_warn_i(struct gfs2_sbd sdp, char assertion,
	100	const char function, char file, unsigned int line)
	101	{
	102	if (time_before(jiffies,
	103	sdp->sd_last_warning +
	104	gfs2_tune_get(sdp, gt_complain_secs) * HZ))
	105	return -2;
	106
d34843d0 BP	107	if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
	108	printk(KERN_WARNING
	109	"GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
	110	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	111	sdp->sd_fsname, assertion,
	112	sdp->sd_fsname, function, file, line);
b3b94faa DT	113
	114	if (sdp->sd_args.ar_debug)
	115	BUG();
18ec7d5c SW	116	else
18ec7d5c SW	117	dump_stack();
b3b94faa	118
d34843d0 BP	119	if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
	120	panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
	121	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	122	sdp->sd_fsname, assertion,
	123	sdp->sd_fsname, function, file, line);
	124
b3b94faa DT	125	sdp->sd_last_warning = jiffies;
	126
	127	return -1;
	128	}
	129
	130	/**
	131	* gfs2_consist_i - Flag a filesystem consistency error and withdraw
	132	* Returns: -1 if this call withdrew the machine,
	133	* 0 if it was already withdrawn
	134	*/
	135
	136	int gfs2_consist_i(struct gfs2_sbd sdp, int cluster_wide, const char function,
	137	char *file, unsigned int line)
	138	{
	139	int rv;
	140	rv = gfs2_lm_withdraw(sdp,
	141	"GFS2: fsid=%s: fatal: filesystem consistency error\n"
	142	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	143	sdp->sd_fsname,
	144	sdp->sd_fsname, function, file, line);
	145	return rv;
	146	}
	147
	148	/**
	149	* gfs2_consist_inode_i - Flag an inode consistency error and withdraw
	150	* Returns: -1 if this call withdrew the machine,
	151	* 0 if it was already withdrawn
	152	*/
	153
	154	int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
	155	const char function, char file, unsigned int line)
	156	{
feaa7bba	157	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
b3b94faa DT	158	int rv;
	159	rv = gfs2_lm_withdraw(sdp,
	160	"GFS2: fsid=%s: fatal: filesystem consistency error\n"
	161	"GFS2: fsid=%s: inode = %llu %llu\n"
	162	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	163	sdp->sd_fsname,
dbb7cae2 SW	164	sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
dbb7cae2 SW	165	(unsigned long long)ip->i_no_addr,
b3b94faa DT	166	sdp->sd_fsname, function, file, line);
	167	return rv;
	168	}
	169
	170	/**
	171	* gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
	172	* Returns: -1 if this call withdrew the machine,
	173	* 0 if it was already withdrawn
	174	*/
	175
	176	int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
	177	const char function, char file, unsigned int line)
	178	{
	179	struct gfs2_sbd *sdp = rgd->rd_sbd;
	180	int rv;
	181	rv = gfs2_lm_withdraw(sdp,
	182	"GFS2: fsid=%s: fatal: filesystem consistency error\n"
	183	"GFS2: fsid=%s: RG = %llu\n"
	184	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	185	sdp->sd_fsname,
bb8d8a6f	186	sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
b3b94faa DT	187	sdp->sd_fsname, function, file, line);
	188	return rv;
	189	}
	190
	191	/**
	192	* gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
	193	* Returns: -1 if this call withdrew the machine,
	194	* -2 if it was already withdrawn
	195	*/
	196
	197	int gfs2_meta_check_ii(struct gfs2_sbd sdp, struct buffer_head bh,
	198	const char type, const char function, char *file,
	199	unsigned int line)
	200	{
	201	int me;
	202	me = gfs2_lm_withdraw(sdp,
	203	"GFS2: fsid=%s: fatal: invalid metadata block\n"
	204	"GFS2: fsid=%s: bh = %llu (%s)\n"
	205	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	206	sdp->sd_fsname,
382066da	207	sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
b3b94faa DT	208	sdp->sd_fsname, function, file, line);
	209	return (me) ? -1 : -2;
	210	}
	211
	212	/**
	213	* gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
	214	* Returns: -1 if this call withdrew the machine,
	215	* -2 if it was already withdrawn
	216	*/
	217
	218	int gfs2_metatype_check_ii(struct gfs2_sbd sdp, struct buffer_head bh,
cd915493	219	u16 type, u16 t, const char *function,
b3b94faa DT	220	char *file, unsigned int line)
	221	{
	222	int me;
	223	me = gfs2_lm_withdraw(sdp,
	224	"GFS2: fsid=%s: fatal: invalid metadata block\n"
	225	"GFS2: fsid=%s: bh = %llu (type: exp=%u, found=%u)\n"
	226	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	227	sdp->sd_fsname,
382066da	228	sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
b3b94faa DT	229	sdp->sd_fsname, function, file, line);
	230	return (me) ? -1 : -2;
	231	}
	232
	233	/**
	234	* gfs2_io_error_i - Flag an I/O error and withdraw
	235	* Returns: -1 if this call withdrew the machine,
	236	* 0 if it was already withdrawn
	237	*/
	238
	239	int gfs2_io_error_i(struct gfs2_sbd sdp, const char function, char *file,
	240	unsigned int line)
	241	{
	242	int rv;
	243	rv = gfs2_lm_withdraw(sdp,
	244	"GFS2: fsid=%s: fatal: I/O error\n"
	245	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	246	sdp->sd_fsname,
	247	sdp->sd_fsname, function, file, line);
	248	return rv;
	249	}
	250
	251	/**
	252	* gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
	253	* Returns: -1 if this call withdrew the machine,
	254	* 0 if it was already withdrawn
	255	*/
	256
	257	int gfs2_io_error_bh_i(struct gfs2_sbd sdp, struct buffer_head bh,
	258	const char function, char file, unsigned int line)
	259	{
	260	int rv;
	261	rv = gfs2_lm_withdraw(sdp,
	262	"GFS2: fsid=%s: fatal: I/O error\n"
	263	"GFS2: fsid=%s: block = %llu\n"
	264	"GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
	265	sdp->sd_fsname,
382066da	266	sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
b3b94faa DT	267	sdp->sd_fsname, function, file, line);
	268	return rv;
	269	}
	270
b3b94faa DT	271	void gfs2_icbit_munge(struct gfs2_sbd sdp, unsigned char *bitmap,
	272	unsigned int bit, int new_value)
	273	{
	274	unsigned int c, o, b = bit;
	275	int old_value;
	276
	277	c = b / (8 * PAGE_SIZE);
	278	b %= 8 * PAGE_SIZE;
	279	o = b / 8;
	280	b %= 8;
	281
	282	old_value = (bitmap[c][o] & (1 << b));
	283	gfs2_assert_withdraw(sdp, !old_value != !new_value);
	284
	285	if (new_value)
	286	bitmap[c][o] \|= 1 << b;
	287	else
	288	bitmap[c][o] &= ~(1 << b);
	289	}
	290