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nilfs2: cleanup multi kmem_cache_{create,destroy} code 

This cleanup patch gives several improvements:

 - Moving all kmem_cache_{create_destroy} calls into one place, which removes
 some small function calls, cleans up error check code and clarify the logic.

 - Mark all initial code in __init section.

 - Remove some very obvious comments.

 - Adjust some declarations.

 - Fix some space-tab issues.

Signed-off-by: Li Hong <lihong.hi@gmail.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Li Hong 2010-04-06 00:54:11 +08:00 committed by Ryusuke Konishi
parent aaed1d5bfa
commit 41c88bd74d
7 changed files with 98 additions and 165 deletions
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40
fs/nilfs2/btree.c
View File

@ -31,46 +31,6 @@
#include "alloc.h"
#include "dat.h"
/**
* struct nilfs_btree_path - A path on which B-tree operations are executed
* @bp_bh: buffer head of node block
* @bp_sib_bh: buffer head of sibling node block
* @bp_index: index of child node
* @bp_oldreq: ptr end request for old ptr
* @bp_newreq: ptr alloc request for new ptr
* @bp_op: rebalance operation
*/
struct nilfs_btree_path {
struct buffer_head *bp_bh;
struct buffer_head *bp_sib_bh;
int bp_index;
union nilfs_bmap_ptr_req bp_oldreq;
union nilfs_bmap_ptr_req bp_newreq;
struct nilfs_btnode_chkey_ctxt bp_ctxt;
void (*bp_op)(struct nilfs_btree *, struct nilfs_btree_path *,
int, __u64 *, __u64 *);
};
/*
* B-tree path operations
*/
static struct kmem_cache *nilfs_btree_path_cache;
int __init nilfs_btree_path_cache_init(void)
{
nilfs_btree_path_cache =
kmem_cache_create("nilfs2_btree_path_cache",
sizeof(struct nilfs_btree_path) *
NILFS_BTREE_LEVEL_MAX, 0, 0, NULL);
return (nilfs_btree_path_cache != NULL) ? 0 : -ENOMEM;
}
void nilfs_btree_path_cache_destroy(void)
{
kmem_cache_destroy(nilfs_btree_path_cache);
}
static struct nilfs_btree_path *nilfs_btree_alloc_path(void)
{
struct nilfs_btree_path *path;

23
fs/nilfs2/btree.h
View File

@ -30,9 +30,6 @@
#include "btnode.h"
#include "bmap.h"
struct nilfs_btree;
struct nilfs_btree_path;
/**
* struct nilfs_btree - B-tree structure
* @bt_bmap: bmap base structure
@ -41,6 +38,25 @@ struct nilfs_btree {
struct nilfs_bmap bt_bmap;
};
/**
* struct nilfs_btree_path - A path on which B-tree operations are executed
* @bp_bh: buffer head of node block
* @bp_sib_bh: buffer head of sibling node block
* @bp_index: index of child node
* @bp_oldreq: ptr end request for old ptr
* @bp_newreq: ptr alloc request for new ptr
* @bp_op: rebalance operation
*/
struct nilfs_btree_path {
struct buffer_head *bp_bh;
struct buffer_head *bp_sib_bh;
int bp_index;
union nilfs_bmap_ptr_req bp_oldreq;
union nilfs_bmap_ptr_req bp_newreq;
struct nilfs_btnode_chkey_ctxt bp_ctxt;
void (*bp_op)(struct nilfs_btree *, struct nilfs_btree_path *,
int, __u64 *, __u64 *);
};
#define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
#define NILFS_BTREE_ROOT_NCHILDREN_MAX \
@ -57,6 +73,7 @@ struct nilfs_btree {
#define NILFS_BTREE_KEY_MIN ((__u64)0)
#define NILFS_BTREE_KEY_MAX (~(__u64)0)
extern struct kmem_cache *nilfs_btree_path_cache;
int nilfs_btree_path_cache_init(void);
void nilfs_btree_path_cache_destroy(void);

25
fs/nilfs2/segbuf.c
View File

@ -40,35 +40,10 @@ struct nilfs_write_info {
sector_t blocknr;
};
static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
struct the_nilfs *nilfs);
static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf);
static struct kmem_cache *nilfs_segbuf_cachep;
static void nilfs_segbuf_init_once(void *obj)
{
memset(obj, 0, sizeof(struct nilfs_segment_buffer));
}
int __init nilfs_init_segbuf_cache(void)
{
nilfs_segbuf_cachep =
kmem_cache_create("nilfs2_segbuf_cache",
sizeof(struct nilfs_segment_buffer),
0, SLAB_RECLAIM_ACCOUNT,
nilfs_segbuf_init_once);
return (nilfs_segbuf_cachep == NULL) ? -ENOMEM : 0;
}
void nilfs_destroy_segbuf_cache(void)
{
kmem_cache_destroy(nilfs_segbuf_cachep);
}
struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb)
{
struct nilfs_segment_buffer *segbuf;

1
fs/nilfs2/segbuf.h
View File

@ -123,6 +123,7 @@ struct nilfs_segment_buffer {
b_assoc_buffers))
#define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head)
extern struct kmem_cache *nilfs_segbuf_cachep;
int __init nilfs_init_segbuf_cache(void);
void nilfs_destroy_segbuf_cache(void);

36
fs/nilfs2/segment.c
View File

@ -116,42 +116,6 @@ static void nilfs_dispose_list(struct nilfs_sb_info *, struct list_head *,
#define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
#define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
/*
* Transaction
*/
static struct kmem_cache *nilfs_transaction_cachep;
/**
* nilfs_init_transaction_cache - create a cache for nilfs_transaction_info
*
* nilfs_init_transaction_cache() creates a slab cache for the struct
* nilfs_transaction_info.
*
* Return Value: On success, it returns 0. On error, one of the following
* negative error code is returned.
*
* %-ENOMEM - Insufficient memory available.
*/
int nilfs_init_transaction_cache(void)
{
nilfs_transaction_cachep =
kmem_cache_create("nilfs2_transaction_cache",
sizeof(struct nilfs_transaction_info),
0, SLAB_RECLAIM_ACCOUNT, NULL);
return (nilfs_transaction_cachep == NULL) ? -ENOMEM : 0;
}
/**
* nilfs_destroy_transaction_cache - destroy the cache for transaction info
*
* nilfs_destroy_transaction_cache() frees the slab cache for the struct
* nilfs_transaction_info.
*/
void nilfs_destroy_transaction_cache(void)
{
kmem_cache_destroy(nilfs_transaction_cachep);
}
static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
{
struct nilfs_transaction_info *cur_ti = current->journal_info;

2
fs/nilfs2/segment.h
View File

@ -217,6 +217,8 @@ enum {
*/
#define NILFS_SC_DEFAULT_WATERMARK 3600
/* super.c */
extern struct kmem_cache *nilfs_transaction_cachep;
/* segment.c */
extern int nilfs_init_transaction_cache(void);

136
fs/nilfs2/super.c
View File

@ -67,6 +67,11 @@ MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
"(NILFS)");
MODULE_LICENSE("GPL");
struct kmem_cache *nilfs_inode_cachep;
struct kmem_cache *nilfs_transaction_cachep;
struct kmem_cache *nilfs_segbuf_cachep;
struct kmem_cache *nilfs_btree_path_cache;
static int nilfs_remount(struct super_block *sb, int *flags, char *data);
/**
@ -129,7 +134,6 @@ void nilfs_warning(struct super_block *sb, const char *function,
va_end(args);
}
static struct kmem_cache *nilfs_inode_cachep;
struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
{
@ -155,34 +159,6 @@ void nilfs_destroy_inode(struct inode *inode)
kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
}
static void init_once(void *obj)
{
struct nilfs_inode_info *ii = obj;
INIT_LIST_HEAD(&ii->i_dirty);
#ifdef CONFIG_NILFS_XATTR
init_rwsem(&ii->xattr_sem);
#endif
nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union;
inode_init_once(&ii->vfs_inode);
}
static int nilfs_init_inode_cache(void)
{
nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
sizeof(struct nilfs_inode_info),
0, SLAB_RECLAIM_ACCOUNT,
init_once);
return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0;
}
static inline void nilfs_destroy_inode_cache(void)
{
kmem_cache_destroy(nilfs_inode_cachep);
}
static void nilfs_clear_inode(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
@ -1139,54 +1115,92 @@ struct file_system_type nilfs_fs_type = {
.fs_flags = FS_REQUIRES_DEV,
};
static void nilfs_inode_init_once(void *obj)
{
struct nilfs_inode_info *ii = obj;
INIT_LIST_HEAD(&ii->i_dirty);
#ifdef CONFIG_NILFS_XATTR
init_rwsem(&ii->xattr_sem);
#endif
nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union;
inode_init_once(&ii->vfs_inode);
}
static void nilfs_segbuf_init_once(void *obj)
{
memset(obj, 0, sizeof(struct nilfs_segment_buffer));
}
static void nilfs_destroy_cachep(void)
{
if (nilfs_inode_cachep)
kmem_cache_destroy(nilfs_inode_cachep);
if (nilfs_transaction_cachep)
kmem_cache_destroy(nilfs_transaction_cachep);
if (nilfs_segbuf_cachep)
kmem_cache_destroy(nilfs_segbuf_cachep);
if (nilfs_btree_path_cache)
kmem_cache_destroy(nilfs_btree_path_cache);
}
static int __init nilfs_init_cachep(void)
{
nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
sizeof(struct nilfs_inode_info), 0,
SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
if (!nilfs_inode_cachep)
goto fail;
nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
sizeof(struct nilfs_transaction_info), 0,
SLAB_RECLAIM_ACCOUNT, NULL);
if (!nilfs_transaction_cachep)
goto fail;
nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
sizeof(struct nilfs_segment_buffer), 0,
SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
if (!nilfs_segbuf_cachep)
goto fail;
nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
0, 0, NULL);
if (!nilfs_btree_path_cache)
goto fail;
return 0;
fail:
nilfs_destroy_cachep();
return -ENOMEM;
}
static int __init init_nilfs_fs(void)
{
int err;
err = nilfs_init_inode_cache();
err = nilfs_init_cachep();
if (err)
goto failed;
err = nilfs_init_transaction_cache();
if (err)
goto failed_inode_cache;
err = nilfs_init_segbuf_cache();
if (err)
goto failed_transaction_cache;
err = nilfs_btree_path_cache_init();
if (err)
goto failed_segbuf_cache;
goto fail;
err = register_filesystem(&nilfs_fs_type);
if (err)
goto failed_btree_path_cache;
goto free_cachep;
return 0;
failed_btree_path_cache:
nilfs_btree_path_cache_destroy();
failed_segbuf_cache:
nilfs_destroy_segbuf_cache();
failed_transaction_cache:
nilfs_destroy_transaction_cache();
failed_inode_cache:
nilfs_destroy_inode_cache();
failed:
free_cachep:
nilfs_destroy_cachep();
fail:
return err;
}
static void __exit exit_nilfs_fs(void)
{
nilfs_destroy_segbuf_cache();
nilfs_destroy_transaction_cache();
nilfs_destroy_inode_cache();
nilfs_btree_path_cache_destroy();
nilfs_destroy_cachep();
unregister_filesystem(&nilfs_fs_type);
}