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nilfs2: insert cache operation in palloc get block routines

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This implements cache operation in get block routines of palloc code:
nilfs_palloc_get_desc_block(), nilfs_palloc_get_bitmap_block(), and
nilfs_palloc_get_entry_block().

This will complete the palloc cache.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2009-11-14 18:40:27 +09:00
parent 49fa7a5902
commit 70622a2091
1 changed files with 54 additions and 8 deletions
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62
fs/nilfs2/alloc.c
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@ -142,29 +142,75 @@ static void nilfs_palloc_desc_block_init(struct inode *inode,
} }
} }
static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff,
int create,
void (*init_block)(struct inode *,
struct buffer_head *,
void *),
struct buffer_head **bhp,
struct nilfs_bh_assoc *prev,
spinlock_t *lock)
{
int ret;
spin_lock(lock);
if (prev->bh && blkoff == prev->blkoff) {
get_bh(prev->bh);
*bhp = prev->bh;
spin_unlock(lock);
return 0;
}
spin_unlock(lock);
ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
if (!ret) {
spin_lock(lock);
/*
* The following code must be safe for change of the
* cache contents during the get block call.
*/
brelse(prev->bh);
get_bh(*bhp);
prev->bh = *bhp;
prev->blkoff = blkoff;
spin_unlock(lock);
}
return ret;
}
static int nilfs_palloc_get_desc_block(struct inode *inode, static int nilfs_palloc_get_desc_block(struct inode *inode,
unsigned long group, unsigned long group,
int create, struct buffer_head **bhp) int create, struct buffer_head **bhp)
{ {
return nilfs_mdt_get_block(inode, struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
nilfs_palloc_desc_blkoff(inode, group),
create, nilfs_palloc_desc_block_init, bhp); return nilfs_palloc_get_block(inode,
nilfs_palloc_desc_blkoff(inode, group),
create, nilfs_palloc_desc_block_init,
bhp, &cache->prev_desc, &cache->lock);
} }
static int nilfs_palloc_get_bitmap_block(struct inode *inode, static int nilfs_palloc_get_bitmap_block(struct inode *inode,
unsigned long group, unsigned long group,
int create, struct buffer_head **bhp) int create, struct buffer_head **bhp)
{ {
return nilfs_mdt_get_block(inode, struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
nilfs_palloc_bitmap_blkoff(inode, group),
create, NULL, bhp); return nilfs_palloc_get_block(inode,
nilfs_palloc_bitmap_blkoff(inode, group),
create, NULL, bhp,
&cache->prev_bitmap, &cache->lock);
} }
int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr, int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
int create, struct buffer_head **bhp) int create, struct buffer_head **bhp)
{ {
return nilfs_mdt_get_block(inode, nilfs_palloc_entry_blkoff(inode, nr), struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
create, NULL, bhp);
return nilfs_palloc_get_block(inode,
nilfs_palloc_entry_blkoff(inode, nr),
create, NULL, bhp,
&cache->prev_entry, &cache->lock);
} }
static struct nilfs_palloc_group_desc * static struct nilfs_palloc_group_desc *