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ocfs2: Change metadata caching locks to an operations structure. 

We don't really want to cart around too many new fields on the
ocfs2_caching_info structure.  So let's wrap all our access of the
parent object in a set of operations.  One pointer on caching_info, and
more flexibility to boot.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Joel Becker 2009-02-10 19:00:37 -08:00
parent 47460d65a4
commit 6e5a3d7538
6 changed files with 170 additions and 53 deletions
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49
fs/ocfs2/inode.c
View File

@ -1395,3 +1395,52 @@ int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
{
return ocfs2_read_inode_block_full(inode, bh, 0);
}
static struct ocfs2_inode_info *cache_info_to_inode(struct ocfs2_caching_info *ci)
{
return container_of(ci, struct ocfs2_inode_info, ip_metadata_cache);
}
static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
{
struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
return oi->ip_blkno;
}
static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
{
struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
spin_lock(&oi->ip_lock);
}
static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
{
struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
spin_unlock(&oi->ip_lock);
}
static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
{
struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
mutex_lock(&oi->ip_io_mutex);
}
static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
{
struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
mutex_unlock(&oi->ip_io_mutex);
}
const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
.co_owner = ocfs2_inode_cache_owner,
.co_cache_lock = ocfs2_inode_cache_lock,
.co_cache_unlock = ocfs2_inode_cache_unlock,
.co_io_lock = ocfs2_inode_cache_io_lock,
.co_io_unlock = ocfs2_inode_cache_io_unlock,
};

1
fs/ocfs2/inode.h
View File

@ -118,6 +118,7 @@ static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
extern struct kmem_cache *ocfs2_inode_cache;
extern const struct address_space_operations ocfs2_aops;
extern const struct ocfs2_caching_operations ocfs2_inode_caching_ops;
void ocfs2_clear_inode(struct inode *inode);
void ocfs2_delete_inode(struct inode *inode);

8
fs/ocfs2/ocfs2.h
View File

@ -68,14 +68,14 @@ enum ocfs2_caching_info_flags {
OCFS2_CACHE_FL_INLINE = 1<<1,
};
struct ocfs2_caching_operations;
struct ocfs2_caching_info {
/*
* The parent structure provides the locks, but because the
* parent structure can differ, struct ocfs2_caching_info needs
* its own pointers to them.
* parent structure can differ, it provides locking operations
* to struct ocfs2_caching_info.
*/
spinlock_t *ci_lock;
struct mutex *ci_io_mutex;
const struct ocfs2_caching_operations *ci_ops;
unsigned int ci_flags;
unsigned int ci_num_cached;

4
fs/ocfs2/super.c
View File

@ -1683,8 +1683,8 @@ static void ocfs2_inode_init_once(void *data)
ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
ocfs2_lock_res_init_once(&oi->ip_open_lockres);
ocfs2_metadata_cache_init(&oi->ip_metadata_cache, &oi->ip_lock,
&oi->ip_io_mutex);
ocfs2_metadata_cache_init(&oi->ip_metadata_cache,
&ocfs2_inode_caching_ops);
inode_init_once(&oi->vfs_inode);
}

131
fs/ocfs2/uptodate.c
View File

@ -75,12 +75,48 @@ struct ocfs2_meta_cache_item {
static struct kmem_cache *ocfs2_uptodate_cachep = NULL;
void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
spinlock_t *cache_lock,
struct mutex *io_mutex)
static u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci)
{
ci->ci_lock = cache_lock;
ci->ci_io_mutex = io_mutex;
BUG_ON(!ci || !ci->ci_ops);
return ci->ci_ops->co_owner(ci);
}
static void ocfs2_metadata_cache_lock(struct ocfs2_caching_info *ci)
{
BUG_ON(!ci || !ci->ci_ops);
ci->ci_ops->co_cache_lock(ci);
}
static void ocfs2_metadata_cache_unlock(struct ocfs2_caching_info *ci)
{
BUG_ON(!ci || !ci->ci_ops);
ci->ci_ops->co_cache_unlock(ci);
}
static void ocfs2_metadata_cache_io_lock(struct ocfs2_caching_info *ci)
{
BUG_ON(!ci || !ci->ci_ops);
ci->ci_ops->co_io_lock(ci);
}
static void ocfs2_metadata_cache_io_unlock(struct ocfs2_caching_info *ci)
{
BUG_ON(!ci || !ci->ci_ops);
ci->ci_ops->co_io_unlock(ci);
}
void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
const struct ocfs2_caching_operations *ops)
{
BUG_ON(!ops);
ci->ci_ops = ops;
ci->ci_flags |= OCFS2_CACHE_FL_INLINE;
ci->ci_num_cached = 0;
}
@ -120,12 +156,15 @@ void ocfs2_metadata_cache_purge(struct inode *inode)
struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
struct rb_root root = RB_ROOT;
spin_lock(ci->ci_lock);
BUG_ON(!ci || !ci->ci_ops);
ocfs2_metadata_cache_lock(ci);
tree = !(ci->ci_flags & OCFS2_CACHE_FL_INLINE);
to_purge = ci->ci_num_cached;
mlog(0, "Purge %u %s items from Inode %llu\n", to_purge,
tree ? "array" : "tree", (unsigned long long)oi->ip_blkno);
mlog(0, "Purge %u %s items from Owner %llu\n", to_purge,
tree ? "array" : "tree",
(unsigned long long)ocfs2_metadata_cache_owner(ci));
/* If we're a tree, save off the root so that we can safely
* initialize the cache. We do the work to free tree members
@ -133,16 +172,17 @@ void ocfs2_metadata_cache_purge(struct inode *inode)
if (tree)
root = ci->ci_cache.ci_tree;
ocfs2_metadata_cache_init(ci, ci->ci_lock, ci->ci_io_mutex);
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_init(ci, ci->ci_ops);
ocfs2_metadata_cache_unlock(ci);
purged = ocfs2_purge_copied_metadata_tree(&root);
/* If possible, track the number wiped so that we can more
* easily detect counting errors. Unfortunately, this is only
* meaningful for trees. */
if (tree && purged != to_purge)
mlog(ML_ERROR, "Inode %llu, count = %u, purged = %u\n",
(unsigned long long)oi->ip_blkno, to_purge, purged);
mlog(ML_ERROR, "Owner %llu, count = %u, purged = %u\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
to_purge, purged);
}
/* Returns the index in the cache array, -1 if not found.
@ -190,10 +230,10 @@ static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi,
struct ocfs2_meta_cache_item *item = NULL;
struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
spin_lock(ci->ci_lock);
ocfs2_metadata_cache_lock(ci);
mlog(0, "Inode %llu, query block %llu (inline = %u)\n",
(unsigned long long)oi->ip_blkno,
mlog(0, "Owner %llu, query block %llu (inline = %u)\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
(unsigned long long) bh->b_blocknr,
!!(ci->ci_flags & OCFS2_CACHE_FL_INLINE));
@ -204,7 +244,7 @@ static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi,
item = ocfs2_search_cache_tree(&oi->ip_metadata_cache,
bh->b_blocknr);
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_unlock(ci);
mlog(0, "index = %d, item = %p\n", index, item);
@ -294,18 +334,19 @@ static void __ocfs2_insert_cache_tree(struct ocfs2_caching_info *ci,
ci->ci_num_cached++;
}
/* co_cache_lock() must be held */
static inline int ocfs2_insert_can_use_array(struct ocfs2_inode_info *oi,
struct ocfs2_caching_info *ci)
{
assert_spin_locked(ci->ci_lock);
return (ci->ci_flags & OCFS2_CACHE_FL_INLINE) &&
(ci->ci_num_cached < OCFS2_CACHE_INFO_MAX_ARRAY);
}
/* tree should be exactly OCFS2_CACHE_INFO_MAX_ARRAY wide. NULL the
* pointers in tree after we use them - this allows caller to detect
* when to free in case of error. */
* when to free in case of error.
*
* The co_cache_lock() must be held. */
static void ocfs2_expand_cache(struct ocfs2_inode_info *oi,
struct ocfs2_meta_cache_item **tree)
{
@ -313,13 +354,12 @@ static void ocfs2_expand_cache(struct ocfs2_inode_info *oi,
struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
mlog_bug_on_msg(ci->ci_num_cached != OCFS2_CACHE_INFO_MAX_ARRAY,
"Inode %llu, num cached = %u, should be %u\n",
(unsigned long long)oi->ip_blkno, ci->ci_num_cached,
OCFS2_CACHE_INFO_MAX_ARRAY);
"Owner %llu, num cached = %u, should be %u\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
ci->ci_num_cached, OCFS2_CACHE_INFO_MAX_ARRAY);
mlog_bug_on_msg(!(ci->ci_flags & OCFS2_CACHE_FL_INLINE),
"Inode %llu not marked as inline anymore!\n",
(unsigned long long)oi->ip_blkno);
assert_spin_locked(ci->ci_lock);
"Owner %llu not marked as inline anymore!\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci));
/* Be careful to initialize the tree members *first* because
* once the ci_tree is used, the array is junk... */
@ -337,7 +377,8 @@ static void ocfs2_expand_cache(struct ocfs2_inode_info *oi,
}
mlog(0, "Expanded %llu to a tree cache: flags 0x%x, num = %u\n",
(unsigned long long)oi->ip_blkno, ci->ci_flags, ci->ci_num_cached);
(unsigned long long)ocfs2_metadata_cache_owner(ci),
ci->ci_flags, ci->ci_num_cached);
}
/* Slow path function - memory allocation is necessary. See the
@ -352,8 +393,8 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
struct ocfs2_meta_cache_item *tree[OCFS2_CACHE_INFO_MAX_ARRAY] =
{ NULL, };
mlog(0, "Inode %llu, block %llu, expand = %d\n",
(unsigned long long)oi->ip_blkno,
mlog(0, "Owner %llu, block %llu, expand = %d\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
(unsigned long long)block, expand_tree);
new = kmem_cache_alloc(ocfs2_uptodate_cachep, GFP_NOFS);
@ -378,13 +419,13 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
}
}
spin_lock(ci->ci_lock);
ocfs2_metadata_cache_lock(ci);
if (ocfs2_insert_can_use_array(oi, ci)) {
mlog(0, "Someone cleared the tree underneath us\n");
/* Ok, items were removed from the cache in between
* locks. Detect this and revert back to the fast path */
ocfs2_append_cache_array(ci, block);
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_unlock(ci);
goto out_free;
}
@ -392,7 +433,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
ocfs2_expand_cache(oi, tree);
__ocfs2_insert_cache_tree(ci, new);
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_unlock(ci);
new = NULL;
out_free:
@ -409,7 +450,7 @@ out_free:
}
}
/* Item insertion is guarded by ci_io_mutex, so the insertion path takes
/* Item insertion is guarded by co_io_lock(), so the insertion path takes
* advantage of this by not rechecking for a duplicate insert during
* the slow case. Additionally, if the cache needs to be bumped up to
* a tree, the code will not recheck after acquiring the lock --
@ -439,18 +480,18 @@ void ocfs2_set_buffer_uptodate(struct inode *inode,
if (ocfs2_buffer_cached(oi, bh))
return;
mlog(0, "Inode %llu, inserting block %llu\n",
(unsigned long long)oi->ip_blkno,
mlog(0, "Owner %llu, inserting block %llu\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
(unsigned long long)bh->b_blocknr);
/* No need to recheck under spinlock - insertion is guarded by
* ci_io_mutex */
spin_lock(ci->ci_lock);
* co_io_lock() */
ocfs2_metadata_cache_lock(ci);
if (ocfs2_insert_can_use_array(oi, ci)) {
/* Fast case - it's an array and there's a free
* spot. */
ocfs2_append_cache_array(ci, bh->b_blocknr);
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_unlock(ci);
return;
}
@ -459,14 +500,14 @@ void ocfs2_set_buffer_uptodate(struct inode *inode,
/* We need to bump things up to a tree. */
expand = 1;
}
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_unlock(ci);
__ocfs2_set_buffer_uptodate(oi, bh->b_blocknr, expand);
}
/* Called against a newly allocated buffer. Most likely nobody should
* be able to read this sort of metadata while it's still being
* allocated, but this is careful to take ci_io_mutex anyway. */
* allocated, but this is careful to take co_io_lock() anyway. */
void ocfs2_set_new_buffer_uptodate(struct inode *inode,
struct buffer_head *bh)
{
@ -478,9 +519,9 @@ void ocfs2_set_new_buffer_uptodate(struct inode *inode,
set_buffer_uptodate(bh);
mutex_lock(ci->ci_io_mutex);
ocfs2_metadata_cache_io_lock(ci);
ocfs2_set_buffer_uptodate(inode, bh);
mutex_unlock(ci->ci_io_mutex);
ocfs2_metadata_cache_io_unlock(ci);
}
/* Requires ip_lock. */
@ -526,9 +567,9 @@ static void ocfs2_remove_block_from_cache(struct inode *inode,
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
spin_lock(ci->ci_lock);
mlog(0, "Inode %llu, remove %llu, items = %u, array = %u\n",
(unsigned long long)oi->ip_blkno,
ocfs2_metadata_cache_lock(ci);
mlog(0, "Owner %llu, remove %llu, items = %u, array = %u\n",
(unsigned long long)ocfs2_metadata_cache_owner(ci),
(unsigned long long) block, ci->ci_num_cached,
ci->ci_flags & OCFS2_CACHE_FL_INLINE);
@ -541,7 +582,7 @@ static void ocfs2_remove_block_from_cache(struct inode *inode,
if (item)
ocfs2_remove_metadata_tree(ci, item);
}
spin_unlock(ci->ci_lock);
ocfs2_metadata_cache_unlock(ci);
if (item)
kmem_cache_free(ocfs2_uptodate_cachep, item);

30
fs/ocfs2/uptodate.h
View File

@ -26,12 +26,38 @@
#ifndef OCFS2_UPTODATE_H
#define OCFS2_UPTODATE_H
/*
* The caching code relies on locking provided by the user of
* struct ocfs2_caching_info. These operations connect that up.
*/
struct ocfs2_caching_operations {
/*
* A u64 representing the owning structure. Usually this
* is the block number (i_blkno or whatnot). This is used so
* that caching log messages can identify the owning structure.
*/
u64 (*co_owner)(struct ocfs2_caching_info *ci);
/*
* Lock and unlock the caching data. These will not sleep, and
* should probably be spinlocks.
*/
void (*co_cache_lock)(struct ocfs2_caching_info *ci);
void (*co_cache_unlock)(struct ocfs2_caching_info *ci);
/*
* Lock and unlock for disk I/O. These will sleep, and should
* be mutexes.
*/
void (*co_io_lock)(struct ocfs2_caching_info *ci);
void (*co_io_unlock)(struct ocfs2_caching_info *ci);
};
int __init init_ocfs2_uptodate_cache(void);
void exit_ocfs2_uptodate_cache(void);
void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
spinlock_t *cache_lock,
struct mutex *io_mutex);
const struct ocfs2_caching_operations *ops);
void ocfs2_metadata_cache_purge(struct inode *inode);
int ocfs2_buffer_uptodate(struct inode *inode,