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f2fs: introduce infra macro and data structure of rb-tree extent cache 

Introduce infra macro and data structure for rb-tree based extent cache:

Macros:
 * EXT_TREE_VEC_SIZE: indicate vector size for gang lookup in extent tree.
 * F2FS_MIN_EXTENT_LEN: indicate minimum length of extent managed in cache.
 * EXTENT_CACHE_SHRINK_NUMBER: indicate number of extent in cache will be shrunk.

Basic data structures for extent cache:
 * struct extent_tree: extent tree entry per inode.
 * struct extent_node: extent info node linked in extent tree.

Besides, adding new extent cache related fields in f2fs_sb_info.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-02-05 17:52:58 +08:00 committed by Jaegeuk Kim
parent 7e4dde79df
commit 13054c548a
2 changed files with 33 additions and 4 deletions
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36
fs/f2fs/f2fs.h
View File

@ -273,13 +273,33 @@ enum {
#define MAX_DIR_RA_PAGES 4 /* maximum ra pages of dir */
/* vector size for gang look-up from extent cache that consists of radix tree */
#define EXT_TREE_VEC_SIZE 64
/* for in-memory extent cache entry */
#define F2FS_MIN_EXTENT_LEN 16 /* minimum extent length */
#define F2FS_MIN_EXTENT_LEN 64 /* minimum extent length */
/* number of extent info in extent cache we try to shrink */
#define EXTENT_CACHE_SHRINK_NUMBER 128
struct extent_info {
unsigned int fofs; /* start offset in a file */
u32 blk; /* start block address of the extent */
unsigned int len; /* length of the extent */
unsigned int fofs; /* start offset in a file */
u32 blk; /* start block address of the extent */
unsigned int len; /* length of the extent */
};
struct extent_node {
struct rb_node rb_node; /* rb node located in rb-tree */
struct list_head list; /* node in global extent list of sbi */
struct extent_info ei; /* extent info */
};
struct extent_tree {
nid_t ino; /* inode number */
struct rb_root root; /* root of extent info rb-tree */
rwlock_t lock; /* protect extent info rb-tree */
atomic_t refcount; /* reference count of rb-tree */
unsigned int count; /* # of extent node in rb-tree*/
};
/*
@ -567,6 +587,14 @@ struct f2fs_sb_info {
struct list_head dir_inode_list; /* dir inode list */
spinlock_t dir_inode_lock; /* for dir inode list lock */
/* for extent tree cache */
struct radix_tree_root extent_tree_root;/* cache extent cache entries */
struct rw_semaphore extent_tree_lock; /* locking extent radix tree */
struct list_head extent_list; /* lru list for shrinker */
spinlock_t extent_lock; /* locking extent lru list */
int total_ext_tree; /* extent tree count */
atomic_t total_ext_node; /* extent info count */
/* basic filesystem units */
unsigned int log_sectors_per_block; /* log2 sectors per block */
unsigned int log_blocksize; /* log2 block size */

1
fs/f2fs/node.h
View File

@ -120,6 +120,7 @@ enum mem_type {
NAT_ENTRIES, /* indicates the cached nat entry */
DIRTY_DENTS, /* indicates dirty dentry pages */
INO_ENTRIES, /* indicates inode entries */
EXTENT_CACHE, /* indicates extent cache */
BASE_CHECK, /* check kernel status */
};