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75ca61c101
linux-next/fs/gfs2/util.h
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.
*/
#ifndef __UTIL_DOT_H__
#define __UTIL_DOT_H__
#include <linux/mempool.h>
#include "incore.h"
#define fs_printk(level, fs, fmt, arg...) \
printk(level "GFS2: fsid=%s: " fmt , (fs)->sd_fsname , ## arg)
#define fs_info(fs, fmt, arg...) \
fs_printk(KERN_INFO , fs , fmt , ## arg)
#define fs_warn(fs, fmt, arg...) \
fs_printk(KERN_WARNING , fs , fmt , ## arg)
#define fs_err(fs, fmt, arg...) \
fs_printk(KERN_ERR, fs , fmt , ## arg)
void gfs2_assert_i(struct gfs2_sbd *sdp);
#define gfs2_assert(sdp, assertion) \
do { \
if (unlikely(!(assertion))) { \
gfs2_assert_i(sdp); \
BUG(); \
} \
} while (0)
int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
const char *function, char *file, unsigned int line);
#define gfs2_assert_withdraw(sdp, assertion) \
((likely(assertion)) ? 0 : gfs2_assert_withdraw_i((sdp), #assertion, \
__func__, __FILE__, __LINE__))
int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
const char *function, char *file, unsigned int line);
#define gfs2_assert_warn(sdp, assertion) \
((likely(assertion)) ? 0 : gfs2_assert_warn_i((sdp), #assertion, \
__func__, __FILE__, __LINE__))
int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide,
const char *function, char *file, unsigned int line);
#define gfs2_consist(sdp) \
gfs2_consist_i((sdp), 0, __func__, __FILE__, __LINE__)
int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
const char *function, char *file, unsigned int line);
#define gfs2_consist_inode(ip) \
gfs2_consist_inode_i((ip), 0, __func__, __FILE__, __LINE__)
int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
const char *function, char *file, unsigned int line);
#define gfs2_consist_rgrpd(rgd) \
gfs2_consist_rgrpd_i((rgd), 0, __func__, __FILE__, __LINE__)
int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
const char *type, const char *function,
char *file, unsigned int line);
static inline int gfs2_meta_check_i(struct gfs2_sbd *sdp,
struct buffer_head *bh,
const char *function,
char *file, unsigned int line)
{
struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
u32 magic = be32_to_cpu(mh->mh_magic);
if (unlikely(magic != GFS2_MAGIC))
return gfs2_meta_check_ii(sdp, bh, "magic number", function,
file, line);
return 0;
}
#define gfs2_meta_check(sdp, bh) \
gfs2_meta_check_i((sdp), (bh), __func__, __FILE__, __LINE__)
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);
static inline int gfs2_metatype_check_i(struct gfs2_sbd *sdp,
struct buffer_head *bh,
u16 type,
const char *function,
char *file, unsigned int line)
{
struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
u32 magic = be32_to_cpu(mh->mh_magic);
u16 t = be32_to_cpu(mh->mh_type);
if (unlikely(magic != GFS2_MAGIC))
return gfs2_meta_check_ii(sdp, bh, "magic number", function,
file, line);
if (unlikely(t != type))
return gfs2_metatype_check_ii(sdp, bh, type, t, function,
file, line);
return 0;
}
#define gfs2_metatype_check(sdp, bh, type) \
gfs2_metatype_check_i((sdp), (bh), (type), __func__, __FILE__, __LINE__)
static inline void gfs2_metatype_set(struct buffer_head *bh, u16 type,
u16 format)
{
struct gfs2_meta_header *mh;
mh = (struct gfs2_meta_header *)bh->b_data;
mh->mh_type = cpu_to_be32(type);
mh->mh_format = cpu_to_be32(format);
}
int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function,
char *file, unsigned int line);
#define gfs2_io_error(sdp) \
gfs2_io_error_i((sdp), __func__, __FILE__, __LINE__);
int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
const char *function, char *file, unsigned int line);
#define gfs2_io_error_bh(sdp, bh) \
gfs2_io_error_bh_i((sdp), (bh), __func__, __FILE__, __LINE__);
extern struct kmem_cache *gfs2_glock_cachep;
extern struct kmem_cache *gfs2_glock_aspace_cachep;
extern struct kmem_cache *gfs2_inode_cachep;
extern struct kmem_cache *gfs2_bufdata_cachep;
extern struct kmem_cache *gfs2_rgrpd_cachep;
extern struct kmem_cache *gfs2_quotad_cachep;
extern mempool_t *gfs2_bh_pool;
static inline unsigned int gfs2_tune_get_i(struct gfs2_tune *gt,
unsigned int *p)
{
unsigned int x;
spin_lock(&gt->gt_spin);
x = *p;
spin_unlock(&gt->gt_spin);
return x;
}
#define gfs2_tune_get(sdp, field) \
gfs2_tune_get_i(&(sdp)->sd_tune, &(sdp)->sd_tune.field)
void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
unsigned int bit, int new_value);
int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...);
#endif /* __UTIL_DOT_H__ */
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