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linux-next/fs/gfs2/util.c
Steven Whitehouse 75ca61c101 GFS2: Remove a __GFP_NOFAIL allocation 
In order to ensure that we've got enough buffer heads for flushing
the journal, the orignal code used __GFP_NOFAIL when performing
this allocation. Here we dispense with that in favour of using a
mempool. This should improve efficiency in low memory conditions
since flushing the journal is a good way to get memory back, we
don't want to be spinning, waiting on memory allocations. The
buffers which are allocated via this mempool are fairly short lived,
so that we'll recycle them pretty quickly.

Although there are other memory allocations which occur during the
journal flush process, this is the one which can potentially require
the most memory, so the most important one to fix.

The amount of memory reserved is a fixed amount, and we should not need
to scale it when there are a greater number of filesystems in use.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2012-03-08 12:10:23 +00:00

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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/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;
mempool_t *gfs2_bh_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 (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);
}
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