forked from luck/tmp_suning_uos_patched
ocfs2: Let ocfs2_xa_prepare_entry() do space checks.
ocfs2_xattr_set_in_bucket() doesn't need to do its own hacky space checking. Let's let ocfs2_xa_prepare_entry() (via ocfs2_xa_set()) do the more accurate work. Whenever it doesn't have space, ocfs2_xattr_set_in_bucket() can try to get more space. Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Joel Becker
parent
bca5e9bd1e
commit
c5d95df5f7
274
fs/ocfs2/xattr.c
274
fs/ocfs2/xattr.c
@ -322,14 +322,6 @@ static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
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return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
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}
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static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
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{
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u16 len = sb->s_blocksize -
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offsetof(struct ocfs2_xattr_header, xh_entries);
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return len / sizeof(struct ocfs2_xattr_entry);
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}
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#define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
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#define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
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#define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
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@ -5417,42 +5409,6 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
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return ret;
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}
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/*
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* Set the xattr name/value in the bucket specified in xs.
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*/
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static int ocfs2_xattr_set_in_bucket(struct inode *inode,
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struct ocfs2_xattr_info *xi,
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struct ocfs2_xattr_search *xs,
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struct ocfs2_xattr_set_ctxt *ctxt)
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{
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int ret;
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u64 blkno;
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struct ocfs2_xa_loc loc;
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if (!xs->bucket->bu_bhs[1]) {
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blkno = bucket_blkno(xs->bucket);
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ocfs2_xattr_bucket_relse(xs->bucket);
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ret = ocfs2_read_xattr_bucket(xs->bucket, blkno);
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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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}
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ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
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xs->not_found ? NULL : xs->here);
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ret = ocfs2_xa_set(&loc, xi, ctxt);
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if (ret) {
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if (ret != -ENOSPC)
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mlog_errno(ret);
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goto out;
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}
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xs->here = loc.xl_entry;
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out:
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return ret;
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}
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/*
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* check whether the xattr bucket is filled up with the same hash value.
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* If we want to insert the xattr with the same hash, return -ENOSPC.
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@ -5481,156 +5437,116 @@ static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
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return 0;
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}
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/*
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* Try to set the entry in the current bucket. If we fail, the caller
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* will handle getting us another bucket.
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*/
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static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
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struct ocfs2_xattr_info *xi,
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struct ocfs2_xattr_search *xs,
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struct ocfs2_xattr_set_ctxt *ctxt)
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{
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int ret;
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struct ocfs2_xa_loc loc;
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mlog_entry("Set xattr %s in xattr bucket\n", xi->xi_name);
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ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
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xs->not_found ? NULL : xs->here);
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ret = ocfs2_xa_set(&loc, xi, ctxt);
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if (!ret) {
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xs->here = loc.xl_entry;
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goto out;
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}
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if (ret != -ENOSPC) {
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mlog_errno(ret);
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goto out;
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}
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/* Ok, we need space. Let's try defragmenting the bucket. */
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ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
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xs->bucket);
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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_xa_set(&loc, xi, ctxt);
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if (!ret) {
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xs->here = loc.xl_entry;
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goto out;
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}
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if (ret != -ENOSPC)
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mlog_errno(ret);
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out:
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mlog_exit(ret);
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return ret;
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}
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static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
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struct ocfs2_xattr_info *xi,
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struct ocfs2_xattr_search *xs,
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struct ocfs2_xattr_set_ctxt *ctxt)
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{
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struct ocfs2_xattr_header *xh;
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struct ocfs2_xattr_entry *xe;
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u16 count, header_size, xh_free_start;
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int free, max_free, need, old;
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size_t value_size = 0;
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size_t blocksize = inode->i_sb->s_blocksize;
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int ret, allocation = 0;
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int ret;
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mlog_entry("Set xattr %s in xattr index block\n", xi->xi_name);
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try_again:
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xh = xs->header;
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count = le16_to_cpu(xh->xh_count);
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xh_free_start = le16_to_cpu(xh->xh_free_start);
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header_size = sizeof(struct ocfs2_xattr_header) +
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count * sizeof(struct ocfs2_xattr_entry);
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max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
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le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
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mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
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"of %u which exceed block size\n",
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(unsigned long long)bucket_blkno(xs->bucket),
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header_size);
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if (xi->xi_value && xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
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value_size = OCFS2_XATTR_ROOT_SIZE;
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else if (xi->xi_value)
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value_size = OCFS2_XATTR_SIZE(xi->xi_value_len);
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if (xs->not_found)
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need = sizeof(struct ocfs2_xattr_entry) +
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OCFS2_XATTR_SIZE(xi->xi_name_len) + value_size;
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else {
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need = value_size + OCFS2_XATTR_SIZE(xi->xi_name_len);
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/*
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* We only replace the old value if the new length is smaller
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* than the old one. Otherwise we will allocate new space in the
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* bucket to store it.
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*/
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xe = xs->here;
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if (ocfs2_xattr_is_local(xe))
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old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
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else
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old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
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if (old >= value_size)
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need = 0;
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ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
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if (!ret)
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goto out;
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if (ret != -ENOSPC) {
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mlog_errno(ret);
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goto out;
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}
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free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
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/* Ack, need more space. Let's try to get another bucket! */
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/*
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* We need to make sure the new name/value pair
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* can exist in the same block.
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* We do not allow for overlapping ranges between buckets. And
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* the maximum number of collisions we will allow for then is
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* one bucket's worth, so check it here whether we need to
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* add a new bucket for the insert.
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*/
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if (xh_free_start % blocksize < need)
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free -= xh_free_start % blocksize;
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mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
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"need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
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" %u\n", xs->not_found,
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(unsigned long long)bucket_blkno(xs->bucket),
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free, need, max_free, le16_to_cpu(xh->xh_free_start),
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le16_to_cpu(xh->xh_name_value_len));
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if (free < need ||
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(xs->not_found &&
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count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) {
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if (need <= max_free &&
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count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
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/*
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* We can create the space by defragment. Since only the
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* name/value will be moved, the xe shouldn't be changed
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* in xs.
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*/
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ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
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xs->bucket);
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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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xh_free_start = le16_to_cpu(xh->xh_free_start);
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free = xh_free_start - header_size
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- OCFS2_XATTR_HEADER_GAP;
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if (xh_free_start % blocksize < need)
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free -= xh_free_start % blocksize;
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if (free >= need)
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goto xattr_set;
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mlog(0, "Can't get enough space for xattr insert by "
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"defragment. Need %u bytes, but we have %d, so "
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"allocate new bucket for it.\n", need, free);
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}
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/*
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* We have to add new buckets or clusters and one
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* allocation should leave us enough space for insert.
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*/
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BUG_ON(allocation);
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/*
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* We do not allow for overlapping ranges between buckets. And
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* the maximum number of collisions we will allow for then is
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* one bucket's worth, so check it here whether we need to
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* add a new bucket for the insert.
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*/
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ret = ocfs2_check_xattr_bucket_collision(inode,
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xs->bucket,
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xi->xi_name);
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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_add_new_xattr_bucket(inode,
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xs->xattr_bh,
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ret = ocfs2_check_xattr_bucket_collision(inode,
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xs->bucket,
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ctxt);
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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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/*
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* ocfs2_add_new_xattr_bucket() will have updated
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* xs->bucket if it moved, but it will not have updated
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* any of the other search fields. Thus, we drop it and
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* re-search. Everything should be cached, so it'll be
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* quick.
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*/
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ocfs2_xattr_bucket_relse(xs->bucket);
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ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
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xi->xi_name_index,
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xi->xi_name, xs);
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if (ret && ret != -ENODATA)
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goto out;
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xs->not_found = ret;
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allocation = 1;
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goto try_again;
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xi->xi_name);
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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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xattr_set:
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ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt);
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ret = ocfs2_add_new_xattr_bucket(inode,
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xs->xattr_bh,
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xs->bucket,
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ctxt);
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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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/*
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* ocfs2_add_new_xattr_bucket() will have updated
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* xs->bucket if it moved, but it will not have updated
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* any of the other search fields. Thus, we drop it and
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* re-search. Everything should be cached, so it'll be
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* quick.
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*/
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ocfs2_xattr_bucket_relse(xs->bucket);
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ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
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xi->xi_name_index,
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xi->xi_name, xs);
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if (ret && ret != -ENODATA)
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goto out;
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xs->not_found = ret;
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/* Ok, we have a new bucket, let's try again */
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ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
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if (ret && (ret != -ENOSPC))
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mlog_errno(ret);
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out:
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mlog_exit(ret);
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return ret;
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