From 0c044f0b24b9128ba8c297149d88bd81f2e36af3 Mon Sep 17 00:00:00 2001 From: Tao Ma Date: Mon, 18 Aug 2008 17:38:50 +0800 Subject: ocfs2: Add xattr bucket iteration for large numbers of EAs Ocfs2 breaks up xattr index tree leaves into 4k regions, called buckets. Attributes are stored within a given bucket, depending on hash value. After a discussion with Mark, we decided that the per-bucket index (xe_entry[]) would only exist in the 1st block of a bucket. Likewise, name/value pairs will not straddle more than one block. This allows the majority of operations to work directly on the buffer heads in a leaf block. This patch adds code to iterate the buckets in an EA. A new abstration of ocfs2_xattr_bucket is added. It records the bhs in this bucket and ocfs2_xattr_header. This keeps the code neat, improving readibility. Signed-off-by: Tao Ma Signed-off-by: Mark Fasheh --- fs/ocfs2/xattr.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'fs/ocfs2/xattr.h') diff --git a/fs/ocfs2/xattr.h b/fs/ocfs2/xattr.h index ed32377be9db..02afa87d5e69 100644 --- a/fs/ocfs2/xattr.h +++ b/fs/ocfs2/xattr.h @@ -48,4 +48,13 @@ extern int ocfs2_xattr_set(struct inode *, int, const char *, const void *, extern int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh); extern struct xattr_handler *ocfs2_xattr_handlers[]; +static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb) +{ + return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE; +} + +static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb) +{ + return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits); +} #endif /* OCFS2_XATTR_H */ -- cgit v1.2.3