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f2fs: add a slab cache entry for small discards 

This patch adds a slab cache entry for small discards.

Each entry consists of:

struct discard_entry {
	struct list_head list;	/* list head */
	block_t blkaddr;	/* block address to be discarded */
	int len;		/* # of consecutive blocks of the discard */
};

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-11-15 13:55:58 +09:00
parent e81c93cf8c
commit 7fd9e544fb
3 changed files with 40 additions and 1 deletions
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14
fs/f2fs/f2fs.h
View File

@ -97,6 +97,13 @@ struct dir_inode_entry {
struct inode *inode; /* vfs inode pointer */
};
/* for the list of blockaddresses to be discarded */
struct discard_entry {
struct list_head list; /* list head */
block_t blkaddr; /* block address to be discarded */
int len; /* # of consecutive blocks of the discard */
};
/* for the list of fsync inodes, used only during recovery */
struct fsync_inode_entry {
struct list_head list; /* list head */
@ -308,6 +315,11 @@ struct f2fs_sm_info {
/* a threshold to reclaim prefree segments */
unsigned int rec_prefree_segments;
/* for small discard management */
struct list_head discard_list; /* 4KB discard list */
int nr_discards; /* # of discards in the list */
int max_discards; /* max. discards to be issued */
};
/*
@ -1079,6 +1091,8 @@ int lookup_journal_in_cursum(struct f2fs_summary_block *,
void flush_sit_entries(struct f2fs_sb_info *);
int build_segment_manager(struct f2fs_sb_info *);
void destroy_segment_manager(struct f2fs_sb_info *);
int __init create_segment_manager_caches(void);
void destroy_segment_manager_caches(void);
/*
* checkpoint.c

20
fs/f2fs/segment.c
View File

@ -22,6 +22,8 @@
#define __reverse_ffz(x) __reverse_ffs(~(x))
static struct kmem_cache *discard_entry_slab;
/*
* __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
* MSB and LSB are reversed in a byte by f2fs_set_bit.
@ -1798,6 +1800,10 @@ int build_segment_manager(struct f2fs_sb_info *sbi)
sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
sm_info->rec_prefree_segments = DEF_RECLAIM_PREFREE_SEGMENTS;
INIT_LIST_HEAD(&sm_info->discard_list);
sm_info->nr_discards = 0;
sm_info->max_discards = 0;
err = build_sit_info(sbi);
if (err)
return err;
@ -1913,3 +1919,17 @@ void destroy_segment_manager(struct f2fs_sb_info *sbi)
sbi->sm_info = NULL;
kfree(sm_info);
}
int __init create_segment_manager_caches(void)
{
discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
sizeof(struct discard_entry), NULL);
if (!discard_entry_slab)
return -ENOMEM;
return 0;
}
void destroy_segment_manager_caches(void)
{
kmem_cache_destroy(discard_entry_slab);
}

7
fs/f2fs/super.c
View File

@ -1078,9 +1078,12 @@ static int __init init_f2fs_fs(void)
err = create_node_manager_caches();
if (err)
goto free_inodecache;
err = create_gc_caches();
err = create_segment_manager_caches();
if (err)
goto free_node_manager_caches;
err = create_gc_caches();
if (err)
goto free_segment_manager_caches;
err = create_checkpoint_caches();
if (err)
goto free_gc_caches;
@ -1102,6 +1105,8 @@ free_checkpoint_caches:
destroy_checkpoint_caches();
free_gc_caches:
destroy_gc_caches();
free_segment_manager_caches:
destroy_segment_manager_caches();
free_node_manager_caches:
destroy_node_manager_caches();
free_inodecache: