[Ocfs2-devel] [PATCH 01/40] ocfs2: Make the ocfs2_caching_info structure self-contained.
Joel Becker
joel.becker at oracle.com
Fri Feb 13 14:15:48 PST 2009
We want to use the ocfs2_caching_info structure in places that are not
inodes. To do that, it can no longer rely on referencing the inode
directly.
This patch moves the flags to ocfs2_caching_info->ci_flags, stores
pointers to the parent's locks on the ocfs2_caching_info, and renames
the constants and flags to reflect its independant state.
Signed-off-by: Joel Becker <joel.becker at oracle.com>
---
fs/ocfs2/inode.c | 5 ++-
fs/ocfs2/inode.h | 2 -
fs/ocfs2/ocfs2.h | 23 +++++++++++-
fs/ocfs2/super.c | 3 +-
fs/ocfs2/uptodate.c | 99 ++++++++++++++++++++++++++------------------------
fs/ocfs2/uptodate.h | 4 ++-
6 files changed, 80 insertions(+), 56 deletions(-)
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 229e707..5a89c3d 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1069,7 +1069,8 @@ void ocfs2_clear_inode(struct inode *inode)
"Clear inode of %llu, inode has %u cache items\n",
(unsigned long long)oi->ip_blkno, oi->ip_metadata_cache.ci_num_cached);
- mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE),
+ mlog_bug_on_msg(!(oi->ip_metadata_cache.ci_flags &
+ OCFS2_CACHE_FL_INLINE),
"Clear inode of %llu, inode has a bad flag\n",
(unsigned long long)oi->ip_blkno);
@@ -1096,7 +1097,7 @@ void ocfs2_clear_inode(struct inode *inode)
(unsigned long long)oi->ip_blkno, oi->ip_open_count);
/* Clear all other flags. */
- oi->ip_flags = OCFS2_INODE_CACHE_INLINE;
+ oi->ip_flags = 0;
oi->ip_created_trans = 0;
oi->ip_last_trans = 0;
oi->ip_dir_start_lookup = 0;
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index eb3c302..84191b1 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -102,8 +102,6 @@ struct ocfs2_inode_info
#define OCFS2_INODE_MAYBE_ORPHANED 0x00000020
/* Does someone have the file open O_DIRECT */
#define OCFS2_INODE_OPEN_DIRECT 0x00000040
-/* Indicates that the metadata cache should be used as an array. */
-#define OCFS2_INODE_CACHE_INLINE 0x00000080
static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
{
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 0773841..b36d961 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -47,17 +47,36 @@
#include "ocfs2_fs.h"
#include "ocfs2_lockid.h"
+
+/* Caching of metadata buffers */
+
/* Most user visible OCFS2 inodes will have very few pieces of
* metadata, but larger files (including bitmaps, etc) must be taken
* into account when designing an access scheme. We allow a small
* amount of inlined blocks to be stored on an array and grow the
* structure into a rb tree when necessary. */
-#define OCFS2_INODE_MAX_CACHE_ARRAY 2
+#define OCFS2_CACHE_INFO_MAX_ARRAY 2
+
+/* Flags for ocfs2_caching_info */
+
+enum ocfs2_caching_info_flags {
+ /* Indicates that the metadata cache is using the inline array */
+ OCFS2_CACHE_FL_INLINE = 1<<1,
+};
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.
+ */
+ spinlock_t *ci_lock;
+ struct mutex *ci_io_mutex;
+
+ unsigned int ci_flags;
unsigned int ci_num_cached;
union {
- sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
+ sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
struct rb_root ci_tree;
} ci_cache;
};
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index b1cb38f..b10e3ca 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1463,7 +1463,8 @@ 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->vfs_inode);
+ ocfs2_metadata_cache_init(&oi->ip_metadata_cache, &oi->ip_lock,
+ &oi->ip_io_mutex);
inode_init_once(&oi->vfs_inode);
}
diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c
index 187b99f..8dbc457 100644
--- a/fs/ocfs2/uptodate.c
+++ b/fs/ocfs2/uptodate.c
@@ -75,12 +75,13 @@ struct ocfs2_meta_cache_item {
static struct kmem_cache *ocfs2_uptodate_cachep = NULL;
-void ocfs2_metadata_cache_init(struct inode *inode)
+void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
+ spinlock_t *cache_lock,
+ struct mutex *io_mutex)
{
- struct ocfs2_inode_info *oi = OCFS2_I(inode);
- struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
-
- oi->ip_flags |= OCFS2_INODE_CACHE_INLINE;
+ ci->ci_lock = cache_lock;
+ ci->ci_io_mutex = io_mutex;
+ ci->ci_flags |= OCFS2_CACHE_FL_INLINE;
ci->ci_num_cached = 0;
}
@@ -119,8 +120,8 @@ 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(&oi->ip_lock);
- tree = !(oi->ip_flags & OCFS2_INODE_CACHE_INLINE);
+ spin_lock(ci->ci_lock);
+ 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,
@@ -132,8 +133,8 @@ void ocfs2_metadata_cache_purge(struct inode *inode)
if (tree)
root = ci->ci_cache.ci_tree;
- ocfs2_metadata_cache_init(inode);
- spin_unlock(&oi->ip_lock);
+ ocfs2_metadata_cache_init(ci, ci->ci_lock, ci->ci_io_mutex);
+ spin_unlock(ci->ci_lock);
purged = ocfs2_purge_copied_metadata_tree(&root);
/* If possible, track the number wiped so that we can more
@@ -187,22 +188,23 @@ static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi,
{
int index = -1;
struct ocfs2_meta_cache_item *item = NULL;
+ struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
- spin_lock(&oi->ip_lock);
+ spin_lock(ci->ci_lock);
mlog(0, "Inode %llu, query block %llu (inline = %u)\n",
(unsigned long long)oi->ip_blkno,
(unsigned long long) bh->b_blocknr,
- !!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE));
+ !!(ci->ci_flags & OCFS2_CACHE_FL_INLINE));
- if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE)
+ if (ci->ci_flags & OCFS2_CACHE_FL_INLINE)
index = ocfs2_search_cache_array(&oi->ip_metadata_cache,
bh->b_blocknr);
else
item = ocfs2_search_cache_tree(&oi->ip_metadata_cache,
bh->b_blocknr);
- spin_unlock(&oi->ip_lock);
+ spin_unlock(ci->ci_lock);
mlog(0, "index = %d, item = %p\n", index, item);
@@ -235,7 +237,7 @@ int ocfs2_buffer_uptodate(struct inode *inode,
/*
* Determine whether a buffer is currently out on a read-ahead request.
- * ip_io_sem should be held to serialize submitters with the logic here.
+ * ci_io_sem should be held to serialize submitters with the logic here.
*/
int ocfs2_buffer_read_ahead(struct inode *inode,
struct buffer_head *bh)
@@ -247,7 +249,7 @@ int ocfs2_buffer_read_ahead(struct inode *inode,
static void ocfs2_append_cache_array(struct ocfs2_caching_info *ci,
sector_t block)
{
- BUG_ON(ci->ci_num_cached >= OCFS2_INODE_MAX_CACHE_ARRAY);
+ BUG_ON(ci->ci_num_cached >= OCFS2_CACHE_INFO_MAX_ARRAY);
mlog(0, "block %llu takes position %u\n", (unsigned long long) block,
ci->ci_num_cached);
@@ -295,13 +297,13 @@ static void __ocfs2_insert_cache_tree(struct ocfs2_caching_info *ci,
static inline int ocfs2_insert_can_use_array(struct ocfs2_inode_info *oi,
struct ocfs2_caching_info *ci)
{
- assert_spin_locked(&oi->ip_lock);
+ assert_spin_locked(ci->ci_lock);
- return (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) &&
- (ci->ci_num_cached < OCFS2_INODE_MAX_CACHE_ARRAY);
+ return (ci->ci_flags & OCFS2_CACHE_FL_INLINE) &&
+ (ci->ci_num_cached < OCFS2_CACHE_INFO_MAX_ARRAY);
}
-/* tree should be exactly OCFS2_INODE_MAX_CACHE_ARRAY wide. NULL the
+/* 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. */
static void ocfs2_expand_cache(struct ocfs2_inode_info *oi,
@@ -310,32 +312,32 @@ static void ocfs2_expand_cache(struct ocfs2_inode_info *oi,
int i;
struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
- mlog_bug_on_msg(ci->ci_num_cached != OCFS2_INODE_MAX_CACHE_ARRAY,
+ 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_INODE_MAX_CACHE_ARRAY);
- mlog_bug_on_msg(!(oi->ip_flags & OCFS2_INODE_CACHE_INLINE),
+ 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(&oi->ip_lock);
+ assert_spin_locked(ci->ci_lock);
/* Be careful to initialize the tree members *first* because
* once the ci_tree is used, the array is junk... */
- for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++)
+ for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++)
tree[i]->c_block = ci->ci_cache.ci_array[i];
- oi->ip_flags &= ~OCFS2_INODE_CACHE_INLINE;
+ ci->ci_flags &= ~OCFS2_CACHE_FL_INLINE;
ci->ci_cache.ci_tree = RB_ROOT;
/* this will be set again by __ocfs2_insert_cache_tree */
ci->ci_num_cached = 0;
- for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) {
+ for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++) {
__ocfs2_insert_cache_tree(ci, tree[i]);
tree[i] = NULL;
}
mlog(0, "Expanded %llu to a tree cache: flags 0x%x, num = %u\n",
- (unsigned long long)oi->ip_blkno, oi->ip_flags, ci->ci_num_cached);
+ (unsigned long long)oi->ip_blkno, ci->ci_flags, ci->ci_num_cached);
}
/* Slow path function - memory allocation is necessary. See the
@@ -347,7 +349,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
int i;
struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
struct ocfs2_meta_cache_item *new = NULL;
- struct ocfs2_meta_cache_item *tree[OCFS2_INODE_MAX_CACHE_ARRAY] =
+ struct ocfs2_meta_cache_item *tree[OCFS2_CACHE_INFO_MAX_ARRAY] =
{ NULL, };
mlog(0, "Inode %llu, block %llu, expand = %d\n",
@@ -364,7 +366,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
if (expand_tree) {
/* Do *not* allocate an array here - the removal code
* has no way of tracking that. */
- for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) {
+ for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++) {
tree[i] = kmem_cache_alloc(ocfs2_uptodate_cachep,
GFP_NOFS);
if (!tree[i]) {
@@ -376,13 +378,13 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
}
}
- spin_lock(&oi->ip_lock);
+ spin_lock(ci->ci_lock);
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(&oi->ip_lock);
+ spin_unlock(ci->ci_lock);
goto out_free;
}
@@ -390,7 +392,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi,
ocfs2_expand_cache(oi, tree);
__ocfs2_insert_cache_tree(ci, new);
- spin_unlock(&oi->ip_lock);
+ spin_unlock(ci->ci_lock);
new = NULL;
out_free:
@@ -400,14 +402,14 @@ out_free:
/* If these were used, then ocfs2_expand_cache re-set them to
* NULL for us. */
if (tree[0]) {
- for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++)
+ for (i = 0; i < OCFS2_CACHE_INFO_MAX_ARRAY; i++)
if (tree[i])
kmem_cache_free(ocfs2_uptodate_cachep,
tree[i]);
}
}
-/* Item insertion is guarded by ip_io_mutex, so the insertion path takes
+/* Item insertion is guarded by ci_io_mutex, 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 --
@@ -442,42 +444,43 @@ void ocfs2_set_buffer_uptodate(struct inode *inode,
(unsigned long long)bh->b_blocknr);
/* No need to recheck under spinlock - insertion is guarded by
- * ip_io_mutex */
- spin_lock(&oi->ip_lock);
+ * ci_io_mutex */
+ spin_lock(ci->ci_lock);
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(&oi->ip_lock);
+ spin_unlock(ci->ci_lock);
return;
}
expand = 0;
- if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) {
+ if (ci->ci_flags & OCFS2_CACHE_FL_INLINE) {
/* We need to bump things up to a tree. */
expand = 1;
}
- spin_unlock(&oi->ip_lock);
+ spin_unlock(ci->ci_lock);
__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 ip_io_mutex anyway. */
+ * allocated, but this is careful to take ci_io_mutex anyway. */
void ocfs2_set_new_buffer_uptodate(struct inode *inode,
struct buffer_head *bh)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
/* This should definitely *not* exist in our cache */
BUG_ON(ocfs2_buffer_cached(oi, bh));
set_buffer_uptodate(bh);
- mutex_lock(&oi->ip_io_mutex);
+ mutex_lock(ci->ci_io_mutex);
ocfs2_set_buffer_uptodate(inode, bh);
- mutex_unlock(&oi->ip_io_mutex);
+ mutex_unlock(ci->ci_io_mutex);
}
/* Requires ip_lock. */
@@ -487,7 +490,7 @@ static void ocfs2_remove_metadata_array(struct ocfs2_caching_info *ci,
sector_t *array = ci->ci_cache.ci_array;
int bytes;
- BUG_ON(index < 0 || index >= OCFS2_INODE_MAX_CACHE_ARRAY);
+ BUG_ON(index < 0 || index >= OCFS2_CACHE_INFO_MAX_ARRAY);
BUG_ON(index >= ci->ci_num_cached);
BUG_ON(!ci->ci_num_cached);
@@ -523,13 +526,13 @@ 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(&oi->ip_lock);
+ spin_lock(ci->ci_lock);
mlog(0, "Inode %llu, remove %llu, items = %u, array = %u\n",
(unsigned long long)oi->ip_blkno,
(unsigned long long) block, ci->ci_num_cached,
- oi->ip_flags & OCFS2_INODE_CACHE_INLINE);
+ ci->ci_flags & OCFS2_CACHE_FL_INLINE);
- if (oi->ip_flags & OCFS2_INODE_CACHE_INLINE) {
+ if (ci->ci_flags & OCFS2_CACHE_FL_INLINE) {
index = ocfs2_search_cache_array(ci, block);
if (index != -1)
ocfs2_remove_metadata_array(ci, index);
@@ -538,7 +541,7 @@ static void ocfs2_remove_block_from_cache(struct inode *inode,
if (item)
ocfs2_remove_metadata_tree(ci, item);
}
- spin_unlock(&oi->ip_lock);
+ spin_unlock(ci->ci_lock);
if (item)
kmem_cache_free(ocfs2_uptodate_cachep, item);
@@ -577,7 +580,7 @@ int __init init_ocfs2_uptodate_cache(void)
return -ENOMEM;
mlog(0, "%u inlined cache items per inode.\n",
- OCFS2_INODE_MAX_CACHE_ARRAY);
+ OCFS2_CACHE_INFO_MAX_ARRAY);
return 0;
}
diff --git a/fs/ocfs2/uptodate.h b/fs/ocfs2/uptodate.h
index 531b4b3..bd749e1 100644
--- a/fs/ocfs2/uptodate.h
+++ b/fs/ocfs2/uptodate.h
@@ -29,7 +29,9 @@
int __init init_ocfs2_uptodate_cache(void);
void exit_ocfs2_uptodate_cache(void);
-void ocfs2_metadata_cache_init(struct inode *inode);
+void ocfs2_metadata_cache_init(struct ocfs2_caching_info *ci,
+ spinlock_t *cache_lock,
+ struct mutex *io_mutex);
void ocfs2_metadata_cache_purge(struct inode *inode);
int ocfs2_buffer_uptodate(struct inode *inode,
--
1.5.6.5
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