[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;

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		fs_err(sdp, "withdrawn\n");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 *          -2 if it was already withdrawn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	59	fs_err(sdp, "withdrawn\n");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	72	* -2 if it was already withdrawn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