ocfs2: Respond to on-disk corruption in the extent map code.

The extent map code has long noticed when the on-disk extent information
is corrupt.  However, so far it has only returned an error.  We should
take the filesystem read-only, as it is corrupt.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index b6ba292e9544000444718395aee0be5f39bf6de0..e6f207eebab422031860c4ef13fed84d351acee7 100644 (file)
--- a/fs/ocfs2/extent_map.c
+++ b/fs/ocfs2/extent_map.c
@@ -181,6 +181,12 @@ static int ocfs2_extent_map_find_leaf(struct inode *inode,
                        ret = -EBADR;
                        if (rec_end > OCFS2_I(inode)->ip_clusters) {
                                mlog_errno(ret);
+                               ocfs2_error(inode->i_sb,
+                                           "Extent %d at e_blkno %"MLFu64" of inode %"MLFu64" goes past ip_clusters of %u\n",
+                                           i,
+                                           le64_to_cpu(rec->e_blkno),
+                                           OCFS2_I(inode)->ip_blkno,
+                                           OCFS2_I(inode)->ip_clusters);
                                goto out_free;
                        }
 
@@ -226,6 +232,12 @@ static int ocfs2_extent_map_find_leaf(struct inode *inode,
                        ret = -EBADR;
                        if (blkno) {
                                mlog_errno(ret);
+                               ocfs2_error(inode->i_sb,
+                                           "Multiple extents for (cpos = %u, clusters = %u) on inode %"MLFu64"; e_blkno %"MLFu64" and rec %d at e_blkno %"MLFu64"\n",
+                                           cpos, clusters,
+                                           OCFS2_I(inode)->ip_blkno,
+                                           blkno, i,
+                                           le64_to_cpu(rec->e_blkno));
                                goto out_free;
                        }
 
@@ -238,6 +250,10 @@ static int ocfs2_extent_map_find_leaf(struct inode *inode,
                 */
                ret = -EBADR;
                if (!blkno) {
+                       ocfs2_error(inode->i_sb,
+                                   "No record found for (cpos = %u, clusters = %u) on inode %"MLFu64"\n",
+                                   cpos, clusters,
+                                   OCFS2_I(inode)->ip_blkno);
                        mlog_errno(ret);
                        goto out_free;
                }
@@ -266,6 +282,20 @@ static int ocfs2_extent_map_find_leaf(struct inode *inode,
 
        for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
                rec = &el->l_recs[i];
+
+               if ((le32_to_cpu(rec->e_cpos) + le32_to_cpu(rec->e_clusters)) >
+                   OCFS2_I(inode)->ip_clusters) {
+                       ret = -EBADR;
+                       mlog_errno(ret);
+                       ocfs2_error(inode->i_sb,
+                                   "Extent %d at e_blkno %"MLFu64" of inode %"MLFu64" goes past ip_clusters of %u\n",
+                                   i,
+                                   le64_to_cpu(rec->e_blkno),
+                                   OCFS2_I(inode)->ip_blkno,
+                                   OCFS2_I(inode)->ip_clusters);
+                       return ret;
+               }
+
                ret = ocfs2_extent_map_insert(inode, rec,
                                              le16_to_cpu(el->l_tree_depth));
                if (ret) {
@@ -526,6 +556,10 @@ static int ocfs2_extent_map_insert(struct inode *inode,
                    OCFS2_I(inode)->ip_map.em_clusters) {
                        ret = -EBADR;
                        mlog_errno(ret);
+                       ocfs2_error(inode->i_sb,
+                                   "Zero e_clusters on non-tail extent record at e_blkno %"MLFu64" on inode %"MLFu64"\n",
+                                   le64_to_cpu(rec->e_blkno),
+                                   OCFS2_I(inode)->ip_blkno);
                        return ret;
                }
 
@@ -588,12 +622,12 @@ static int ocfs2_extent_map_insert(struct inode *inode,
  * Existing record in the extent map:
  *
  *     cpos = 10, len = 10
- *     |---------|
+ *     |---------|
  *
  * New Record:
  *
  *     cpos = 10, len = 20
- *     |------------------|
+ *     |------------------|
  *
  * The passed record is the new on-disk record.  The new_clusters value
  * is how many clusters were added to the file.  If the append is a