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, 2 insertions, 0 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 69ea663ef03e..755ba8682233 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -341,6 +341,7 @@ static int __ext4_check_blockref(const char *function, unsigned int line,
                                  struct inode *inode,
                                  __le32 *p, unsigned int max)
 {
+        struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
         __le32 *bref = p;
         unsigned int blk;
 
@@ -349,6 +350,7 @@ static int __ext4_check_blockref(const char *function, unsigned int line,
                 if (blk &&
                     unlikely(!ext4_data_block_valid(EXT4_SB(inode->i_sb),
                                                     blk, 1))) {
+                        es->s_last_error_block = cpu_to_le64(blk);
                         ext4_error_inode(inode, function, line, blk,
                                          "invalid block");
                         return -EIO;