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nilfs2: cleanup multi kmem_cache_{create,destroy} code

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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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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);
}