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-rw-r--r--fs/nilfs2/alloc.c108
1 files changed, 85 insertions, 23 deletions
diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c
index d69e6ae59251..3f959f1879d8 100644
--- a/fs/nilfs2/alloc.c
+++ b/fs/nilfs2/alloc.c
@@ -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,
unsigned long group,
int create, struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(inode,
- nilfs_palloc_desc_blkoff(inode, group),
- create, nilfs_palloc_desc_block_init, bhp);
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ 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,
unsigned long group,
int create, struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(inode,
- nilfs_palloc_bitmap_blkoff(inode, group),
- create, NULL, bhp);
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ 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 create, struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(inode, nilfs_palloc_entry_blkoff(inode, nr),
- create, NULL, bhp);
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ 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 *
@@ -176,13 +222,6 @@ nilfs_palloc_block_get_group_desc(const struct inode *inode,
group % nilfs_palloc_groups_per_desc_block(inode);
}
-static unsigned char *
-nilfs_palloc_block_get_bitmap(const struct inode *inode,
- const struct buffer_head *bh, void *kaddr)
-{
- return (unsigned char *)(kaddr + bh_offset(bh));
-}
-
void *nilfs_palloc_block_get_entry(const struct inode *inode, __u64 nr,
const struct buffer_head *bh, void *kaddr)
{
@@ -289,8 +328,7 @@ int nilfs_palloc_prepare_alloc_entry(struct inode *inode,
if (ret < 0)
goto out_desc;
bitmap_kaddr = kmap(bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(
- inode, bitmap_bh, bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
pos = nilfs_palloc_find_available_slot(
inode, group, group_offset, bitmap,
entries_per_group);
@@ -351,8 +389,7 @@ void nilfs_palloc_commit_free_entry(struct inode *inode,
desc = nilfs_palloc_block_get_group_desc(inode, group,
req->pr_desc_bh, desc_kaddr);
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(inode, req->pr_bitmap_bh,
- bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
group_offset, bitmap))
@@ -385,8 +422,7 @@ void nilfs_palloc_abort_alloc_entry(struct inode *inode,
desc = nilfs_palloc_block_get_group_desc(inode, group,
req->pr_desc_bh, desc_kaddr);
bitmap_kaddr = kmap(req->pr_bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(inode, req->pr_bitmap_bh,
- bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(req->pr_bitmap_bh);
if (!nilfs_clear_bit_atomic(nilfs_mdt_bgl_lock(inode, group),
group_offset, bitmap))
printk(KERN_WARNING "%s: entry numer %llu already freed\n",
@@ -472,8 +508,7 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
desc = nilfs_palloc_block_get_group_desc(
inode, group, desc_bh, desc_kaddr);
bitmap_kaddr = kmap(bitmap_bh->b_page);
- bitmap = nilfs_palloc_block_get_bitmap(
- inode, bitmap_bh, bitmap_kaddr);
+ bitmap = bitmap_kaddr + bh_offset(bitmap_bh);
for (j = i, n = 0;
(j < nitems) && nilfs_palloc_group_is_in(inode, group,
entry_nrs[j]);
@@ -502,3 +537,30 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
}
return 0;
}
+
+void nilfs_palloc_setup_cache(struct inode *inode,
+ struct nilfs_palloc_cache *cache)
+{
+ NILFS_MDT(inode)->mi_palloc_cache = cache;
+ spin_lock_init(&cache->lock);
+}
+
+void nilfs_palloc_clear_cache(struct inode *inode)
+{
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ spin_lock(&cache->lock);
+ brelse(cache->prev_desc.bh);
+ brelse(cache->prev_bitmap.bh);
+ brelse(cache->prev_entry.bh);
+ cache->prev_desc.bh = NULL;
+ cache->prev_bitmap.bh = NULL;
+ cache->prev_entry.bh = NULL;
+ spin_unlock(&cache->lock);
+}
+
+void nilfs_palloc_destroy_cache(struct inode *inode)
+{
+ nilfs_palloc_clear_cache(inode);
+ NILFS_MDT(inode)->mi_palloc_cache = NULL;
+}