Re: [PATCH] btrfs: report filesystem shutdown via fserror

[Filipe Manana]

On Mon, Feb 16, 2026 at 3:01 AM Miquel Sabaté Solà <mssola@xxxxxxxxxx> wrote:
>
> Commit 347b7042fb26 ("Merge patch series "fs: generic file IO error
> reporting"") has introduced a common framework for reporting errors to
> fsnotify in a standard way.
>
> One of the functions being introduced is 'fserror_report_shutdown' that,
> when combined with the experimental support for shutdown in btrfs, it
> means that user-space can also easily detect whenever a btrfs filesystem
> has been marked as shutdown.
>
> Signed-off-by: Miquel Sabaté Solà <mssola@xxxxxxxxxx>

Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx>

Once the for-next branch is based on the next kernel rc that includes
the new function, I can push the patch there.

Thanks.

> ---
> Note that the for-next branch does not include the mentioned commit. I've
> built and tested this patch on top of current Linus' tree.
>
>  fs/btrfs/fs.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/fs/btrfs/fs.h b/fs/btrfs/fs.h
> index 3de3b517810e..92fcebf5766e 100644
> --- a/fs/btrfs/fs.h
> +++ b/fs/btrfs/fs.h
> @@ -33,6 +33,7 @@
>  #include "async-thread.h"
>  #include "block-rsv.h"
>  #include "messages.h"
> +#include <linux/fserror.h>
>
>  struct inode;
>  struct super_block;
> @@ -1199,8 +1200,10 @@ static inline void btrfs_force_shutdown(struct btrfs_fs_info *fs_info)
>          * So here we only mark the fs error without flipping it RO.
>          */
>         WRITE_ONCE(fs_info->fs_error, -EIO);
> -       if (!test_and_set_bit(BTRFS_FS_STATE_EMERGENCY_SHUTDOWN, &fs_info->fs_state))
> +       if (!test_and_set_bit(BTRFS_FS_STATE_EMERGENCY_SHUTDOWN, &fs_info->fs_state)) {
>                 btrfs_crit(fs_info, "emergency shutdown");
> +               fserror_report_shutdown(fs_info->sb, GFP_KERNEL);
> +       }
>  }
>
>  /*
> --
> 2.53.0
>