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fs/buffer.c: add device information for error output in __find_get_block_slow()

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On the ext4 mailing list[1], we got some report about errors in
__find_get_block_slow(), but the information is very limited.

If the device information is given, we can know the name of the sick
volume.  Futhermore, we can get the corresponding status of that
block(group, inode block etc) by analyzing the disk layout.

[1] http://marc.info/?l=linux-ext4&m=131379831421147&w=2

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tao Ma 2011-10-31 17:09:00 -07:00 committed by Linus Torvalds
parent 584cff54e1
commit 72a2ebd8bc
1 changed files with 4 additions and 1 deletions
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5
fs/buffer.c
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@ -213,13 +213,16 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
* elsewhere, don't buffer_error if we had some unmapped buffers
*/
if (all_mapped) {
char b[BDEVNAME_SIZE];
printk("__find_get_block_slow() failed. "
"block=%llu, b_blocknr=%llu\n",
(unsigned long long)block,
(unsigned long long)bh->b_blocknr);
printk("b_state=0x%08lx, b_size=%zu\n",
bh->b_state, bh->b_size);
printk("device blocksize: %d\n", 1 << bd_inode->i_blkbits);
printk("device %s blocksize: %d\n", bdevname(bdev, b),
1 << bd_inode->i_blkbits);
}
out_unlock:
spin_unlock(&bd_mapping->private_lock);