ocfs2: Attach xattr clusters to refcount tree.

In ocfs2, when xattr's value is larger than OCFS2_XATTR_INLINE_SIZE,
it will be kept outside of the blocks we store xattr entry. And they
are stored in a b-tree also. So this patch try to attach all these
clusters to refcount tree also.

Signed-off-by: Tao Ma <tao.ma@oracle.com>

1 files changed, 291 insertions, 0 deletions

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index bfa7ee208855..501539a733f4 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -5551,6 +5551,297 @@ out:
 }
 
 /*
+ * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
+ * The physical clusters will be added to refcount tree.
+ */
+static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
+                                struct ocfs2_xattr_value_root *xv,
+                                struct ocfs2_extent_tree *value_et,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc,
+                                struct ocfs2_post_refcount *refcount)
+{
+        int ret = 0;
+        u32 clusters = le32_to_cpu(xv->xr_clusters);
+        u32 cpos, p_cluster, num_clusters;
+        struct ocfs2_extent_list *el = &xv->xr_list;
+        unsigned int ext_flags;
+
+        cpos = 0;
+        while (cpos < clusters) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
+                                               &num_clusters, el, &ext_flags);
+
+                cpos += num_clusters;
+                if ((ext_flags & OCFS2_EXT_REFCOUNTED))
+                        continue;
+
+                BUG_ON(!p_cluster);
+
+                ret = ocfs2_add_refcount_flag(inode, value_et,
+                                              ref_ci, ref_root_bh,
+                                              cpos - num_clusters,
+                                              p_cluster, num_clusters,
+                                              dealloc, refcount);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+/*
+ * Given a normal ocfs2_xattr_header, refcount all the entries which
+ * have value stored outside.
+ * Used for xattrs stored in inode and ocfs2_xattr_block.
+ */
+static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
+                                struct ocfs2_xattr_value_buf *vb,
+                                struct ocfs2_xattr_header *header,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+
+        struct ocfs2_xattr_entry *xe;
+        struct ocfs2_xattr_value_root *xv;
+        struct ocfs2_extent_tree et;
+        int i, ret = 0;
+
+        for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
+                xe = &header->xh_entries[i];
+
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                xv = (struct ocfs2_xattr_value_root *)((void *)header +
+                        le16_to_cpu(xe->xe_name_offset) +
+                        OCFS2_XATTR_SIZE(xe->xe_name_len));
+
+                vb->vb_xv = xv;
+                ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
+
+                ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
+                                                        ref_ci, ref_root_bh,
+                                                        dealloc, NULL);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
+                                struct buffer_head *fe_bh,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
+        struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
+                                (fe_bh->b_data + inode->i_sb->s_blocksize -
+                                le16_to_cpu(di->i_xattr_inline_size));
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_bh = fe_bh,
+                .vb_access = ocfs2_journal_access_di,
+        };
+
+        return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
+                                                  ref_ci, ref_root_bh, dealloc);
+}
+
+struct ocfs2_xattr_tree_value_refcount_para {
+        struct ocfs2_caching_info *ref_ci;
+        struct buffer_head *ref_root_bh;
+        struct ocfs2_cached_dealloc_ctxt *dealloc;
+};
+
+static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
+                                           struct ocfs2_xattr_bucket *bucket,
+                                           int offset,
+                                           struct ocfs2_xattr_value_root **xv,
+                                           struct buffer_head **bh)
+{
+        int ret, block_off, name_offset;
+        struct ocfs2_xattr_header *xh = bucket_xh(bucket);
+        struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
+        void *base;
+
+        ret = ocfs2_xattr_bucket_get_name_value(sb,
+                                                bucket_xh(bucket),
+                                                offset,
+                                                &block_off,
+                                                &name_offset);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        base = bucket_block(bucket, block_off);
+
+        *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
+                         OCFS2_XATTR_SIZE(xe->xe_name_len));
+
+        if (bh)
+                *bh = bucket->bu_bhs[block_off];
+out:
+        return ret;
+}
+
+/*
+ * For a given xattr bucket, refcount all the entries which
+ * have value stored outside.
+ */
+static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
+                                             struct ocfs2_xattr_bucket *bucket,
+                                             void *para)
+{
+        int i, ret = 0;
+        struct ocfs2_extent_tree et;
+        struct ocfs2_xattr_tree_value_refcount_para *ref =
+                        (struct ocfs2_xattr_tree_value_refcount_para *)para;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
+        struct ocfs2_xattr_entry *xe;
+        struct ocfs2_xattr_value_buf vb = {
+                .vb_access = ocfs2_journal_access,
+        };
+        struct ocfs2_post_refcount refcount = {
+                .credits = bucket->bu_blocks,
+                .para = bucket,
+                .func = ocfs2_xattr_bucket_post_refcount,
+        };
+        struct ocfs2_post_refcount *p = NULL;
+
+        /* We only need post_refcount if we support metaecc. */
+        if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
+                p = &refcount;
+
+        mlog(0, "refcount bucket %llu, count = %u\n",
+             (unsigned long long)bucket_blkno(bucket),
+             le16_to_cpu(xh->xh_count));
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
+                xe = &xh->xh_entries[i];
+
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
+                                                      &vb.vb_xv, &vb.vb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ocfs2_init_xattr_value_extent_tree(&et,
+                                                   INODE_CACHE(inode), &vb);
+
+                ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
+                                                        &et, ref->ref_ci,
+                                                        ref->ref_root_bh,
+                                                        ref->dealloc, p);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+
+}
+
+static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
+                                     struct buffer_head *root_bh,
+                                     u64 blkno, u32 cpos, u32 len, void *para)
+{
+        return ocfs2_iterate_xattr_buckets(inode, blkno, len,
+                                           ocfs2_xattr_bucket_value_refcount,
+                                           para);
+}
+
+static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
+                                struct buffer_head *blk_bh,
+                                struct ocfs2_caching_info *ref_ci,
+                                struct buffer_head *ref_root_bh,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret = 0;
+        struct ocfs2_xattr_block *xb =
+                                (struct ocfs2_xattr_block *)blk_bh->b_data;
+
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
+                struct ocfs2_xattr_value_buf vb = {
+                        .vb_bh = blk_bh,
+                        .vb_access = ocfs2_journal_access_xb,
+                };
+
+                ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
+                                                         ref_ci, ref_root_bh,
+                                                         dealloc);
+        } else {
+                struct ocfs2_xattr_tree_value_refcount_para para = {
+                        .ref_ci = ref_ci,
+                        .ref_root_bh = ref_root_bh,
+                        .dealloc = dealloc,
+                };
+
+                ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
+                                                ocfs2_refcount_xattr_tree_rec,
+                                                &para);
+        }
+
+        return ret;
+}
+
+int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
+                                     struct buffer_head *fe_bh,
+                                     struct ocfs2_caching_info *ref_ci,
+                                     struct buffer_head *ref_root_bh,
+                                     struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret = 0;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
+        struct buffer_head *blk_bh = NULL;
+
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
+                ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
+                                                         ref_ci, ref_root_bh,
+                                                         dealloc);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        if (!di->i_xattr_loc)
+                goto out;
+
+        ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
+                                     &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
+                                                ref_root_bh, dealloc);
+        if (ret)
+                mlog_errno(ret);
+
+        brelse(blk_bh);
+out:
+
+        return ret;
+}
+
+/*
  * 'security' attributes support
  */
 static size_t ocfs2_xattr_security_list(struct inode *inode, char *list,