tree b54ff317457566bb10bd8e2e8345a440907ef7da
parent d31a688a49a82a48e0434aee9d851e094270a6ee
parent 1d38e750a389e919c1608dbc61cd5c93cd4915dc
author Linus Torvalds <torvalds@linux-foundation.org> 1786983352 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1786983352 -0700
mergetag object 1d38e750a389e919c1608dbc61cd5c93cd4915dc
 type commit
 tag vfs-7.3-rc1.failfs
 tagger Christian Brauner <brauner@kernel.org> 1786695972 +0200
 
 vfs-7.3-rc1.failfs
 
 Please consider pulling these changes from the signed vfs-7.3-rc1.failfs tag.
 
 Thanks!
 Christian
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Merge tag 'vfs-7.3-rc1.failfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull failfs filesystem from Christian Brauner:
 "Add failfs and expose a FD_FAILFS_ROOT sentinel.

  This allows userspace to shed their filesystem state completely. A
  process with its root or working directory in failfs must anchor every
  path lookup at an explicit file descriptor. Absolute paths, absolute
  symlinks and AT_FDCWD-relative lookups simply fail.

  Failfs is the counterpart to nullfs. nullfs says adds a permanently
  empty, immutable directory whose lookups fail with ENOENT but which
  can be opened, read, stat'd and mounted upon. Failfs on the other hand
  fails every operation. The root cannot be opened at all. A single
  instance is mounted during early boot via kern_mount(), which makes it
  logically distinct from every mount namespace.

  This is accompanied by a new fchroot() system call which makes
  chrooting via a file descriptor a first class concept. It's possible
  to chroot into failfs as an unprivileged user provided the task has no
  new privileges set"

* tag 'vfs-7.3-rc1.failfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  Documentation: add failfs documentation
  selftests/filesystems: add failfs selftests
  arch: hookup fchroot() system call
  fs: support FD_FAILFS_ROOT in fchroot()
  fs: add fchroot()
  fs: support FD_FAILFS_ROOT in fchdir()
  fs: add failfs