linux-sg2042/fs/gfs2/util.c

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/*
* 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/slab.h>
#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_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fs_err(sdp, "withdrawn\n");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* -2 if it was already withdrawn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);
[GFS2] Make journaled data files identical to normal files on disk This is a very large patch, with a few still to be resolved issues so you might want to check out the previous head of the tree since this is known to be unstable. Fixes for the various bugs will be forthcoming shortly. This patch removes the special data format which has been used up till now for journaled data files. Directories still retain the old format so that they will remain on disk compatible with earlier releases. As a result you can now do the following with journaled data files: 1) mmap them 2) export them over NFS 3) convert to/from normal files whenever you want to (the zero length restriction is gone) In addition the level at which GFS' locking is done has changed for all files (since they all now use the page cache) such that the locking is done at the page cache level rather than the level of the fs operations. This should mean that things like loopback mounts and other things which touch the page cache directly should now work. Current known issues: 1. There is a lock mode inversion problem related to the resource group hold function which needs to be resolved. 2. Any significant amount of I/O causes an oops with an offset of hex 320 (NULL pointer dereference) which appears to be related to a journaled data buffer appearing on a list where it shouldn't be. 3. Direct I/O writes are disabled for the time being (will reappear later) 4. There is probably a deadlock between the page lock and GFS' locks under certain combinations of mmap and fs operation I/O. 5. Issue relating to ref counting on internally used inodes causes a hang on umount (discovered before this patch, and not fixed by it) 6. One part of the directory metadata is different from GFS1 and will need to be resolved before next release. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-08 19:50:51 +08:00
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();
[GFS2] Make journaled data files identical to normal files on disk This is a very large patch, with a few still to be resolved issues so you might want to check out the previous head of the tree since this is known to be unstable. Fixes for the various bugs will be forthcoming shortly. This patch removes the special data format which has been used up till now for journaled data files. Directories still retain the old format so that they will remain on disk compatible with earlier releases. As a result you can now do the following with journaled data files: 1) mmap them 2) export them over NFS 3) convert to/from normal files whenever you want to (the zero length restriction is gone) In addition the level at which GFS' locking is done has changed for all files (since they all now use the page cache) such that the locking is done at the page cache level rather than the level of the fs operations. This should mean that things like loopback mounts and other things which touch the page cache directly should now work. Current known issues: 1. There is a lock mode inversion problem related to the resource group hold function which needs to be resolved. 2. Any significant amount of I/O causes an oops with an offset of hex 320 (NULL pointer dereference) which appears to be related to a journaled data buffer appearing on a list where it shouldn't be. 3. Direct I/O writes are disabled for the time being (will reappear later) 4. There is probably a deadlock between the page lock and GFS' locks under certain combinations of mmap and fs operation I/O. 5. Issue relating to ref counting on internally used inodes causes a hang on umount (discovered before this patch, and not fixed by it) 6. One part of the directory metadata is different from GFS1 and will need to be resolved before next release. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-08 19:50:51 +08:00
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);
}