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ocfs2: Convenient access to an xattr bucket's header. 

The xattr code often wants to access the ocfs2_xattr_header at the start
of an bucket.  Rather than walk the pointer chains, let's just create
another nice macro.  As a side benefit, we can get rid of the mostly
spurious ->bu_xh element on the bucket structure.  The idea is ripped
from the ocfs2_path code.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker 2008-10-24 17:04:49 -07:00 committed by Mark Fasheh
parent 51def39f0c
commit 3e6329463e
1 changed files with 12 additions and 16 deletions
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28
fs/ocfs2/xattr.c
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@ -62,7 +62,6 @@ struct ocfs2_xattr_def_value_root {
struct ocfs2_xattr_bucket {
struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
struct ocfs2_xattr_header *bu_xh;
};
#define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
@ -156,6 +155,7 @@ static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
#define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
#define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
#define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
static inline const char *ocfs2_xattr_prefix(int name_index)
{
@ -798,7 +798,7 @@ static int ocfs2_xattr_block_get(struct inode *inode,
if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
ret = ocfs2_xattr_bucket_get_name_value(inode,
xs->bucket.bu_xh,
bucket_xh(&xs->bucket),
i,
&block_off,
&name_offset);
@ -2280,11 +2280,9 @@ static int ocfs2_xattr_bucket_find(struct inode *inode,
bh = NULL;
}
xs->bucket.bu_bhs[0] = lower_bh;
xs->bucket.bu_xh = (struct ocfs2_xattr_header *)
bucket_block(&xs->bucket, 0);
lower_bh = NULL;
xs->header = xs->bucket.bu_xh;
xs->header = bucket_xh(&xs->bucket);
xs->base = bucket_block(&xs->bucket, 0);
xs->end = xs->base + inode->i_sb->s_blocksize;
@ -2379,17 +2377,16 @@ static int ocfs2_iterate_xattr_buckets(struct inode *inode,
goto out;
}
bucket.bu_xh = (struct ocfs2_xattr_header *)bucket_block(&bucket, 0);
/*
* The real bucket num in this series of blocks is stored
* in the 1st bucket.
*/
if (i == 0)
num_buckets = le16_to_cpu(bucket.bu_xh->xh_num_buckets);
num_buckets = le16_to_cpu(bucket_xh(&bucket)->xh_num_buckets);
mlog(0, "iterating xattr bucket %llu, first hash %u\n",
(unsigned long long)blkno,
le32_to_cpu(bucket.bu_xh->xh_entries[0].xe_name_hash));
le32_to_cpu(bucket_xh(&bucket)->xh_entries[0].xe_name_hash));
if (func) {
ret = func(inode, &bucket, para);
if (ret) {
@ -2444,14 +2441,14 @@ static int ocfs2_list_xattr_bucket(struct inode *inode,
int i, block_off, new_offset;
const char *prefix, *name;
for (i = 0 ; i < le16_to_cpu(bucket->bu_xh->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &bucket->bu_xh->xh_entries[i];
for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
type = ocfs2_xattr_get_type(entry);
prefix = ocfs2_xattr_prefix(type);
if (prefix) {
ret = ocfs2_xattr_bucket_get_name_value(inode,
bucket->bu_xh,
bucket_xh(bucket),
i,
&block_off,
&new_offset);
@ -2631,8 +2628,7 @@ static int ocfs2_xattr_update_xattr_search(struct inode *inode,
xs->bucket.bu_bhs[0] = new_bh;
get_bh(new_bh);
xs->bucket.bu_xh = (struct ocfs2_xattr_header *)bucket_block(&xs->bucket, 0);
xs->header = xs->bucket.bu_xh;
xs->header = bucket_xh(&xs->bucket);
xs->base = new_bh->b_data;
xs->end = xs->base + inode->i_sb->s_blocksize;
@ -4398,7 +4394,7 @@ static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
struct ocfs2_xattr_search *xs)
{
handle_t *handle = NULL;
struct ocfs2_xattr_header *xh = xs->bucket.bu_xh;
struct ocfs2_xattr_header *xh = bucket_xh(&xs->bucket);
struct ocfs2_xattr_entry *last = &xh->xh_entries[
le16_to_cpu(xh->xh_count) - 1];
int ret = 0;
@ -4533,7 +4529,7 @@ static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
const char *name)
{
struct ocfs2_xattr_header *xh = bucket->bu_xh;
struct ocfs2_xattr_header *xh = bucket_xh(bucket);
u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
@ -4703,7 +4699,7 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
void *para)
{
int ret = 0;
struct ocfs2_xattr_header *xh = bucket->bu_xh;
struct ocfs2_xattr_header *xh = bucket_xh(bucket);
u16 i;
struct ocfs2_xattr_entry *xe;