nilfs2: insert cache operation in palloc get block routines
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>
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@ -142,29 +142,75 @@ static void nilfs_palloc_desc_block_init(struct inode *inode,
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}
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}
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static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff,
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int create,
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void (*init_block)(struct inode *,
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struct buffer_head *,
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void *),
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struct buffer_head **bhp,
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struct nilfs_bh_assoc *prev,
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spinlock_t *lock)
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{
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int ret;
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spin_lock(lock);
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if (prev->bh && blkoff == prev->blkoff) {
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get_bh(prev->bh);
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*bhp = prev->bh;
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spin_unlock(lock);
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return 0;
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}
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spin_unlock(lock);
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ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp);
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if (!ret) {
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spin_lock(lock);
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/*
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* The following code must be safe for change of the
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* cache contents during the get block call.
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*/
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brelse(prev->bh);
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get_bh(*bhp);
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prev->bh = *bhp;
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prev->blkoff = blkoff;
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spin_unlock(lock);
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}
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return ret;
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}
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static int nilfs_palloc_get_desc_block(struct inode *inode,
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unsigned long group,
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int create, struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(inode,
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nilfs_palloc_desc_blkoff(inode, group),
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create, nilfs_palloc_desc_block_init, bhp);
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_get_block(inode,
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nilfs_palloc_desc_blkoff(inode, group),
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create, nilfs_palloc_desc_block_init,
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bhp, &cache->prev_desc, &cache->lock);
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}
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static int nilfs_palloc_get_bitmap_block(struct inode *inode,
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unsigned long group,
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int create, struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(inode,
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nilfs_palloc_bitmap_blkoff(inode, group),
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create, NULL, bhp);
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_get_block(inode,
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nilfs_palloc_bitmap_blkoff(inode, group),
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create, NULL, bhp,
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&cache->prev_bitmap, &cache->lock);
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}
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int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr,
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int create, struct buffer_head **bhp)
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{
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return nilfs_mdt_get_block(inode, nilfs_palloc_entry_blkoff(inode, nr),
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create, NULL, bhp);
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struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
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return nilfs_palloc_get_block(inode,
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nilfs_palloc_entry_blkoff(inode, nr),
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create, NULL, bhp,
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&cache->prev_entry, &cache->lock);
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}
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static struct nilfs_palloc_group_desc *
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