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authorTheodore Ts'o <tytso@mit.edu>2011-01-10 12:29:43 -0500
committerTheodore Ts'o <tytso@mit.edu>2011-01-10 12:29:43 -0500
commit8aefcd557d26d0023a36f9ec5afbf55e59f8f26b (patch)
treee13143306cd64525cddd2cc2513c448275a1d95a /include/linux/jbd2.h
parent353eb83c1422c6326eaab30ce044a179c6018169 (diff)
downloadtalos-op-linux-8aefcd557d26d0023a36f9ec5afbf55e59f8f26b.tar.gz
talos-op-linux-8aefcd557d26d0023a36f9ec5afbf55e59f8f26b.zip
ext4: dynamically allocate the jbd2_inode in ext4_inode_info as necessary
Replace the jbd2_inode structure (which is 48 bytes) with a pointer and only allocate the jbd2_inode when it is needed --- that is, when the file system has a journal present and the inode has been opened for writing. This allows us to further slim down the ext4_inode_info structure. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include/linux/jbd2.h')
-rw-r--r--include/linux/jbd2.h20
1 files changed, 18 insertions, 2 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 2ae86aa21fce..27e79c27ba08 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -94,7 +94,7 @@ extern void jbd2_free(void *ptr, size_t size);
*
* This is an opaque datatype.
**/
-typedef struct handle_s handle_t; /* Atomic operation type */
+typedef struct jbd2_journal_handle handle_t; /* Atomic operation type */
/**
@@ -416,7 +416,7 @@ struct jbd2_revoke_table_s;
* in so it can be fixed later.
*/
-struct handle_s
+struct jbd2_journal_handle
{
/* Which compound transaction is this update a part of? */
transaction_t *h_transaction;
@@ -1158,6 +1158,22 @@ static inline void jbd2_free_handle(handle_t *handle)
kmem_cache_free(jbd2_handle_cache, handle);
}
+/*
+ * jbd2_inode management (optional, for those file systems that want to use
+ * dynamically allocated jbd2_inode structures)
+ */
+extern struct kmem_cache *jbd2_inode_cache;
+
+static inline struct jbd2_inode *jbd2_alloc_inode(gfp_t gfp_flags)
+{
+ return kmem_cache_alloc(jbd2_inode_cache, gfp_flags);
+}
+
+static inline void jbd2_free_inode(struct jbd2_inode *jinode)
+{
+ kmem_cache_free(jbd2_inode_cache, jinode);
+}
+
/* Primary revoke support */
#define JOURNAL_REVOKE_DEFAULT_HASH 256
extern int jbd2_journal_init_revoke(journal_t *, int);
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