forked from Minki/linux
ocfs2: Improve ocfs2_read_xattr_bucket().
The ocfs2_read_xattr_bucket() function would read an xattr bucket into a list of buffer heads. However, we have a nice ocfs2_xattr_bucket structure. Let's have it fill that out instead. In addition, ocfs2_read_xattr_bucket() would initialize buffer heads for a bucket that's never been on disk before. That's confusing. Let's call that functionality ocfs2_init_xattr_bucket(). The functions ocfs2_cp_xattr_bucket() and ocfs2_half_xattr_bucket() are updated to use the ocfs2_xattr_bucket structure rather than raw bh lists. That way they can use the new read/init calls. In addition, they drop the wasted read of an existing target bucket. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker
Mark Fasheh
parent
6dde41d9e7
commit
784b816a91
165
fs/ocfs2/xattr.c
165
fs/ocfs2/xattr.c
@ -168,6 +168,48 @@ static void ocfs2_xattr_bucket_relse(struct inode *inode,
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}
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}
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/*
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* A bucket that has never been written to disk doesn't need to be
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* read. We just need the buffer_heads. Don't call this for
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* buckets that are already on disk. ocfs2_read_xattr_bucket() initializes
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* them fully.
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*/
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static int ocfs2_init_xattr_bucket(struct inode *inode,
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struct ocfs2_xattr_bucket *bucket,
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u64 xb_blkno)
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{
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int i, rc = 0;
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int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
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for (i = 0; i < blks; i++) {
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bucket->bu_bhs[i] = sb_getblk(inode->i_sb, xb_blkno + i);
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if (!bucket->bu_bhs[i]) {
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rc = -EIO;
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mlog_errno(rc);
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break;
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}
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ocfs2_set_new_buffer_uptodate(inode, bucket->bu_bhs[i]);
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}
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if (rc)
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ocfs2_xattr_bucket_relse(inode, bucket);
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return rc;
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}
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/* Read the xattr bucket at xb_blkno */
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static int ocfs2_read_xattr_bucket(struct inode *inode,
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struct ocfs2_xattr_bucket *bucket,
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u64 xb_blkno)
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{
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int rc, blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
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rc = ocfs2_read_blocks(inode, xb_blkno, blks, bucket->bu_bhs, 0);
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if (rc)
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ocfs2_xattr_bucket_relse(inode, bucket);
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return rc;
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}
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static inline const char *ocfs2_xattr_prefix(int name_index)
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{
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struct xattr_handler *handler = NULL;
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@ -3097,31 +3139,6 @@ out:
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return ret;
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}
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static int ocfs2_read_xattr_bucket(struct inode *inode,
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u64 blkno,
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struct buffer_head **bhs,
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int new)
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{
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int ret = 0;
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u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
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if (!new)
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return ocfs2_read_blocks(inode, blkno,
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blk_per_bucket, bhs, 0);
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for (i = 0; i < blk_per_bucket; i++) {
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bhs[i] = sb_getblk(inode->i_sb, blkno + i);
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if (bhs[i] == NULL) {
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ret = -EIO;
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mlog_errno(ret);
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break;
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}
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ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
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}
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return ret;
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}
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/*
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* Find the suitable pos when we divide a bucket into 2.
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* We have to make sure the xattrs with the same hash value exist
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@ -3184,7 +3201,7 @@ static int ocfs2_divide_xattr_bucket(struct inode *inode,
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int ret, i;
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int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
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u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
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struct buffer_head **s_bhs, **t_bhs = NULL;
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struct ocfs2_xattr_bucket s_bucket, t_bucket;
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struct ocfs2_xattr_header *xh;
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struct ocfs2_xattr_entry *xe;
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int blocksize = inode->i_sb->s_blocksize;
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@ -3192,37 +3209,34 @@ static int ocfs2_divide_xattr_bucket(struct inode *inode,
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mlog(0, "move some of xattrs from bucket %llu to %llu\n",
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(unsigned long long)blk, (unsigned long long)new_blk);
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s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
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if (!s_bhs)
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return -ENOMEM;
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memset(&s_bucket, 0, sizeof(struct ocfs2_xattr_bucket));
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memset(&t_bucket, 0, sizeof(struct ocfs2_xattr_bucket));
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ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
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ret = ocfs2_read_xattr_bucket(inode, &s_bucket, blk);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_journal_access(handle, inode, s_bhs[0],
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ret = ocfs2_journal_access(handle, inode, s_bucket.bu_bhs[0],
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OCFS2_JOURNAL_ACCESS_WRITE);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
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if (!t_bhs) {
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ret = -ENOMEM;
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goto out;
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}
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ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
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/*
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* Even if !new_bucket_head, we're overwriting t_bucket. Thus,
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* there's no need to read it.
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*/
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ret = ocfs2_init_xattr_bucket(inode, &t_bucket, new_blk);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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for (i = 0; i < blk_per_bucket; i++) {
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ret = ocfs2_journal_access(handle, inode, t_bhs[i],
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ret = ocfs2_journal_access(handle, inode, t_bucket.bu_bhs[i],
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new_bucket_head ?
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OCFS2_JOURNAL_ACCESS_CREATE :
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OCFS2_JOURNAL_ACCESS_WRITE);
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@ -3232,7 +3246,7 @@ static int ocfs2_divide_xattr_bucket(struct inode *inode,
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}
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}
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xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
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xh = bucket_xh(&s_bucket);
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count = le16_to_cpu(xh->xh_count);
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start = ocfs2_xattr_find_divide_pos(xh);
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@ -3245,9 +3259,9 @@ static int ocfs2_divide_xattr_bucket(struct inode *inode,
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* that of the last entry in the previous bucket.
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*/
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for (i = 0; i < blk_per_bucket; i++)
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memset(t_bhs[i]->b_data, 0, blocksize);
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memset(bucket_block(&t_bucket, i), 0, blocksize);
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xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
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xh = bucket_xh(&t_bucket);
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xh->xh_free_start = cpu_to_le16(blocksize);
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xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
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le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
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@ -3257,10 +3271,11 @@ static int ocfs2_divide_xattr_bucket(struct inode *inode,
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/* copy the whole bucket to the new first. */
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for (i = 0; i < blk_per_bucket; i++)
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memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
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memcpy(bucket_block(&t_bucket, i), bucket_block(&s_bucket, i),
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blocksize);
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/* update the new bucket. */
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xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
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xh = bucket_xh(&t_bucket);
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/*
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* Calculate the total name/value len and xh_free_start for
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@ -3325,7 +3340,7 @@ set_num_buckets:
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xh->xh_num_buckets = 0;
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for (i = 0; i < blk_per_bucket; i++) {
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ocfs2_journal_dirty(handle, t_bhs[i]);
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ocfs2_journal_dirty(handle, t_bucket.bu_bhs[i]);
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if (ret)
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mlog_errno(ret);
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}
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@ -3342,29 +3357,20 @@ set_num_buckets:
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if (start == count)
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goto out;
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xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
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xh = bucket_xh(&s_bucket);
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memset(&xh->xh_entries[start], 0,
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sizeof(struct ocfs2_xattr_entry) * (count - start));
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xh->xh_count = cpu_to_le16(start);
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xh->xh_free_start = cpu_to_le16(name_offset);
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xh->xh_name_value_len = cpu_to_le16(name_value_len);
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ocfs2_journal_dirty(handle, s_bhs[0]);
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ocfs2_journal_dirty(handle, s_bucket.bu_bhs[0]);
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if (ret)
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mlog_errno(ret);
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out:
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if (s_bhs) {
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for (i = 0; i < blk_per_bucket; i++)
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brelse(s_bhs[i]);
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}
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kfree(s_bhs);
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if (t_bhs) {
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for (i = 0; i < blk_per_bucket; i++)
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brelse(t_bhs[i]);
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}
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kfree(t_bhs);
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ocfs2_xattr_bucket_relse(inode, &s_bucket);
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ocfs2_xattr_bucket_relse(inode, &t_bucket);
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return ret;
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}
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@ -3384,7 +3390,7 @@ static int ocfs2_cp_xattr_bucket(struct inode *inode,
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int ret, i;
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int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
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int blocksize = inode->i_sb->s_blocksize;
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struct buffer_head **s_bhs, **t_bhs = NULL;
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struct ocfs2_xattr_bucket s_bucket, t_bucket;
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BUG_ON(s_blkno == t_blkno);
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@ -3392,28 +3398,23 @@ static int ocfs2_cp_xattr_bucket(struct inode *inode,
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(unsigned long long)s_blkno, (unsigned long long)t_blkno,
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t_is_new);
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s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
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GFP_NOFS);
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if (!s_bhs)
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return -ENOMEM;
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memset(&s_bucket, 0, sizeof(struct ocfs2_xattr_bucket));
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memset(&t_bucket, 0, sizeof(struct ocfs2_xattr_bucket));
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ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
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ret = ocfs2_read_xattr_bucket(inode, &s_bucket, s_blkno);
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if (ret)
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goto out;
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t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
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GFP_NOFS);
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if (!t_bhs) {
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ret = -ENOMEM;
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goto out;
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}
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ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
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/*
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* Even if !t_is_new, we're overwriting t_bucket. Thus,
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* there's no need to read it.
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*/
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ret = ocfs2_init_xattr_bucket(inode, &t_bucket, t_blkno);
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if (ret)
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goto out;
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for (i = 0; i < blk_per_bucket; i++) {
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ret = ocfs2_journal_access(handle, inode, t_bhs[i],
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ret = ocfs2_journal_access(handle, inode, t_bucket.bu_bhs[i],
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t_is_new ?
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OCFS2_JOURNAL_ACCESS_CREATE :
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OCFS2_JOURNAL_ACCESS_WRITE);
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@ -3422,22 +3423,14 @@ static int ocfs2_cp_xattr_bucket(struct inode *inode,
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}
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for (i = 0; i < blk_per_bucket; i++) {
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memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
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ocfs2_journal_dirty(handle, t_bhs[i]);
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memcpy(bucket_block(&t_bucket, i), bucket_block(&s_bucket, i),
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blocksize);
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ocfs2_journal_dirty(handle, t_bucket.bu_bhs[i]);
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}
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out:
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if (s_bhs) {
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for (i = 0; i < blk_per_bucket; i++)
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brelse(s_bhs[i]);
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}
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kfree(s_bhs);
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if (t_bhs) {
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for (i = 0; i < blk_per_bucket; i++)
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brelse(t_bhs[i]);
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}
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kfree(t_bhs);
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ocfs2_xattr_bucket_relse(inode, &s_bucket);
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ocfs2_xattr_bucket_relse(inode, &t_bucket);
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return ret;
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}
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