Merge tag 'vfs-6.18-rc1.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Merge tag 'vfs-6.18-rc1.mount' of git://git./linux/kernel/git/vfs/vfs

Pull vfs mount updates from Christian Brauner:
 "This contains some work around mount api handling:

   - Output the warning message for mnt_too_revealing() triggered during
     fsmount() to the fscontext log. This makes it possible for the
     mount tool to output appropriate warnings on the command line.

     For example, with the newest fsopen()-based mount(8) from
     util-linux, the error messages now look like:

       # mount -t proc proc /tmp
       mount: /tmp: fsmount() failed: VFS: Mount too revealing.
              dmesg(1) may have more information after failed mount system call.

   - Do not consume fscontext log entries when returning -EMSGSIZE

     Userspace generally expects APIs that return -EMSGSIZE to allow for
     them to adjust their buffer size and retry the operation.

     However, the fscontext log would previously clear the message even
     in the -EMSGSIZE case.

     Given that it is very cheap for us to check whether the buffer is
     too small before we remove the message from the ring buffer, let's
     just do that instead.

   - Drop an unused argument from do_remount()"

* tag 'vfs-6.18-rc1.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  vfs: fs/namespace.c: remove ms_flags argument from do_remount
  selftests/filesystems: add basic fscontext log tests
  fscontext: do not consume log entries when returning -EMSGSIZE
  vfs: output mount_too_revealing() errors to fscontext
  docs/vfs: Remove mentions to the old mount API helpers
  fscontext: add custom-prefix log helpers
  fs: Remove mount_bdev
  fs: Remove mount_nodev