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f2fs: add a slab cache entry for small discards

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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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20
fs/f2fs/segment.c
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@@ -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);
}