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

[Filipe Manana <fdmanana@kernel.org>]

On Wed, Feb 18, 2026 at 11:59 AM Miquel Sabaté Solà <mssola@mssola.com> wrote:
>
> Filipe Manana @ 2026-02-18 11:54 GMT:
>
> > On Mon, Feb 16, 2026 at 3:01 AM Miquel Sabaté Solà <mssola@mssola.com> 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@mssola.com>
> >
> > Reviewed-by: Filipe Manana <fdmanana@suse.com>
> >
> > Once the for-next branch is based on the next kernel rc that includes
> > the new function, I can push the patch there.

Now pushed into the for-next github branch.

>
> Thanks for taking care of this!
>
> >
> > 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
> >>