ext4: Save error information to the superblock for analysis

Save number of file system errors, and the time function name, line
number, block number, and inode number of the first and most recent
errors reported on the file system in the superblock.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index 5b6973fbf1bd..3db5084db9bd 100644
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -229,16 +229,20 @@ int ext4_data_block_valid(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk,
 
         if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
             (start_blk + count < start_blk) ||
-            (start_blk + count > ext4_blocks_count(sbi->s_es)))
+            (start_blk + count > ext4_blocks_count(sbi->s_es))) {
+                sbi->s_es->s_last_error_block = cpu_to_le64(start_blk);
                 return 0;
+        }
         while (n) {
                 entry = rb_entry(n, struct ext4_system_zone, node);
                 if (start_blk + count - 1 < entry->start_blk)
                         n = n->rb_left;
                 else if (start_blk >= (entry->start_blk + entry->count))
                         n = n->rb_right;
-                else
+                else {
+                        sbi->s_es->s_last_error_block = cpu_to_le64(start_blk);
                         return 0;
+                }
         }
         return 1;
 }