nilfs2: emit error message when I/O error is detected

When nilfs returned -EIO as an error code, it's not always clear if it
came from the underlying block device or not.  This will mend the issue
by having low level I/O routines of nilfs output an error message when
they detected an I/O error.

Link: http://lkml.kernel.org/r/1464875891-5443-7-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 16 insertions, 2 deletions

diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index 2c52693a69a4..2e315f9f2e51 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -517,6 +517,9 @@ static int __nilfs_btree_get_block(const struct nilfs_bmap *btree, __u64 ptr,
 
  out_no_wait:
         if (!buffer_uptodate(bh)) {
+                nilfs_msg(btree->b_inode->i_sb, KERN_ERR,
+                          "I/O error reading b-tree node block (ino=%lu, blocknr=%llu)",
+                          btree->b_inode->i_ino, (unsigned long long)ptr);
                 brelse(bh);
                 return -EIO;
         }
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index e9148f94d696..853a831dcde0 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -148,8 +148,15 @@ int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
 {
         wait_on_buffer(bh);
-        if (!buffer_uptodate(bh))
+        if (!buffer_uptodate(bh)) {
+                struct inode *inode = bh->b_page->mapping->host;
+
+                nilfs_msg(inode->i_sb, KERN_ERR,
+                          "I/O error reading %s block for GC (ino=%lu, vblocknr=%llu)",
+                          buffer_nilfs_node(bh) ? "node" : "data",
+                          inode->i_ino, (unsigned long long)bh->b_blocknr);
                 return -EIO;
+        }
         if (buffer_dirty(bh))
                 return -EEXIST;
 
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 0d7b71fbeff8..d56d3a5bea88 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -207,8 +207,12 @@ static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
 
  out_no_wait:
         err = -EIO;
-        if (!buffer_uptodate(first_bh))
+        if (!buffer_uptodate(first_bh)) {
+                nilfs_msg(inode->i_sb, KERN_ERR,
+                          "I/O error reading meta-data file (ino=%lu, block-offset=%lu)",
+                          inode->i_ino, block);
                 goto failed_bh;
+        }
  out:
         *out_bh = first_bh;
         return 0;