[PATCH 2/3] xfs: handle shutdown notifications

[Dan Williams]

Dave, I'm looking to push out a branch with this patch included.  Any concerns?

On Tue, Dec 1, 2015 at 3:58 PM, Dan Williams <dan.j.williams at intel.com> wrote:
> Force a filesystem shutdown when the backing device is known to be dead.
> I.e. blk_queue_enter() permanently returns -ENODEV.
>
> Cc: xfs at oss.sgi.com
> Suggested-by: Dave Chinner <david at fromorbit.com>
> Signed-off-by: Dan Williams <dan.j.williams at intel.com>
> ---
>  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 39989e990df9..dfe9a53a7c53 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -1802,7 +1802,7 @@ 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;
>
> @@ -1828,6 +1828,7 @@ static void generic_bdi_gone(struct super_block *sb)
>         spin_unlock(&sb->s_inode_list_lock);
>         iput(_inode);
>  }
> +EXPORT_SYMBOL(generic_bdi_gone);
>
>  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(
> +       struct super_block *sb)
> +{
> +       xfs_force_shutdown(XFS_M(sb), SHUTDOWN_DEVICE_REQ);
> +       generic_bdi_gone(sb);
> +}
> +
>  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);
>
>  extern struct super_block *blockdev_superblock;
>
> @@ -2277,6 +2278,7 @@ static inline void bd_forget(struct inode *inode) {}
>  static inline int sync_blockdev(struct block_device *bdev) { return 0; }
>  static inline void kill_bdev(struct block_device *bdev) {}
>  static inline void invalidate_bdev(struct block_device *bdev) {}
> +static inline void generic_bdi_gone(struct super_block *sb) {}
>
>  static inline struct super_block *freeze_bdev(struct block_device *sb)
>  {
>
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