On Wed, Apr 18, 2012 at 12:22:34PM +0800, anand jain wrote:
> > [370517.204350] btrfs: 1 errors while writing supers
> > [370517.204376] ------------[ cut here ]------------
> > [370517.204391] kernel BUG at fs/btrfs/disk-io.c:2880!
>
> -----------
> if (total_errors > max_errors) {
> printk(KERN_ERR "btrfs: %d errors while writing supers\n",
> total_errors);
> /* This shouldn't happen. FUA is masked off if unsupported */
> BUG();
> }
> -----------
This is what versions up to 3.3 do.
>
> accessible disk(s) is(are) below the critical number of disk(s),
> btrfs has limited choice. IMO instead of BUG, we could have a
> user configurable choice to either panic or fail-pending-IO,
> dump and force-unmount.
With 3.4-rc the BUG is not there, -EIO is returned and the filesystem
goes readonly. Something like the following output, triggered by
echo 1 > /sys/block/DEV/device/delete
[27712.760344] sd 6:0:0:0: [sdg] Synchronizing SCSI cache
[27712.760448] sd 6:0:0:0: [sdg] Stopping disk
[27712.762771] ata6.00: disabled
[27732.780063] BTRFS error (device sdg1) in btree_writepage_io_failed_hook:3735: IO failure (Error occured while writing out btree at 29442048)
[27732.780072] btrfs is forced readonly
[27732.780081] BTRFS error (device sdg1) in btree_writepage_io_failed_hook:3735: IO failure (Error occured while writing out btree at 29437952)
[27732.780090] BTRFS error (device sdg1) in btree_writepage_io_failed_hook:3735: IO failure (Error occured while writing out btree at 29433856)
[27732.780121] BTRFS error (device sdg1) in btrfs_commit_transaction:1455: IO failure (Error while writing out transaction.)
[27732.780131] BTRFS warning (device sdg1): Skipping commit of aborted transaction.
[27732.780137] delayed_refs has NO entry
[27732.780714] ata6: hard resetting link
david
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