On Mon, Jan 04, 2016 at 10:20:11AM -0800, Dan Williams wrote:
> Force a filesystem shutdown when the backing device is known to be dead.
> I.e. blk_queue_enter() permanently returns -ENODEV.
>
> Cc: xfs@xxxxxxxxxxx
> Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
> fs/block_dev.c | 3 ++-
> fs/xfs/xfs_super.c | 9 +++++++++
> include/linux/fs.h | 2 ++
> 3 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 739e43a37e64..7d6c66148948 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -1806,7 +1806,7 @@ int __invalidate_device(struct block_device *bdev, bool kill_dirty)
> }
> EXPORT_SYMBOL(__invalidate_device);
>
> -static void generic_bdi_gone(struct super_block *sb)
> +void generic_bdi_gone(struct super_block *sb)
> {
> struct inode *inode, *_inode = NULL;
>
> @@ -1832,6 +1832,7 @@ static void generic_bdi_gone(struct super_block *sb)
> spin_unlock(&sb->s_inode_list_lock);
> iput(_inode);
> }
> +EXPORT_SYMBOL(generic_bdi_gone);
That should be in the previous patch.
> void shutdown_partition(struct gendisk *disk, int partno)
> {
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 36bd8825bfb0..63c36508e9db 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -1618,6 +1618,14 @@ xfs_fs_free_cached_objects(
> return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
> }
>
> +static void
> +xfs_fs_bdi_gone(
xfs_fs_shutdown
> + struct super_block *sb)
> +{
> + xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REQ);
> + generic_bdi_gone(sb);
> +}
> +
This is wrong. we have to unmap the DAX inodes during *every*
shutdown that XFS executes. Hence it needs to be done inside
xfs_do_force_shutdown(), not in addition to the shutdown when the
block device is pulled. i.e. something like this in
xfs_do_force_shutdown():
*/
if (xfs_log_force_umount(mp, logerror))
return;
+
+ /*
+ * If DAX is in use, we have to unmap all direct access
+ * virtual mappings to ensure nothing more gets written
+ * directly from userspace. This will force them to refault
+ * and that will result in them detecting the shutdown
+ * condition and hence will fail appropriately.
+ */
+ unmap_dax_inodes(mp->m_super);
if (flags & SHUTDOWN_CORRUPT_INCORE) {
xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT
> static const struct super_operations xfs_super_operations = {
> .alloc_inode = xfs_fs_alloc_inode,
> .destroy_inode = xfs_fs_destroy_inode,
> @@ -1632,6 +1640,7 @@ static const struct super_operations xfs_super_operations = {
> .show_options = xfs_fs_show_options,
> .nr_cached_objects = xfs_fs_nr_cached_objects,
> .free_cached_objects = xfs_fs_free_cached_objects,
> + .bdi_gone = xfs_fs_bdi_gone,
> };
>
> static struct file_system_type xfs_fs_type = {
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 0e201ed38045..b1e8e049e4b8 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2265,6 +2265,7 @@ extern struct super_block *freeze_bdev(struct block_device *);
> extern void emergency_thaw_all(void);
> extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
> extern int fsync_bdev(struct block_device *);
> +extern void generic_bdi_gone(struct super_block *sb);
previous patch.
-Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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