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linux/fs/gfs2/util.h
Steven Whitehouse e8c92ed769 GFS2: Clean up log write code path 
Prior to this patch, we have two ways of sending i/o to the log.
One of those is used when we need to allocate both the data
to be written itself and also a buffer head to submit it. This
is done via sb_getblk and friends. This is used mostly for writing
log headers.

The other method is used when writing blocks which have some
in-place counterpart. This is the case for all the metadata
blocks which are journalled, and when journaled data is in use,
for unescaped journalled data blocks.

This patch replaces both of those two methods, and about half
a dozen separate i/o submission points with a single i/o
submission function. We also go direct to bio rather than
using buffer heads, since this allows us to build i/o
requests of the maximum size for the block device in
question. It also reduces the memory required for flushing
the log, which can be very useful in low memory situations.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2012-04-24 16:44:34 +01:00

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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 struct kmem_cache *gfs2_rsrv_cachep;
extern mempool_t *gfs2_page_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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