[GIT PULL] afs: Miscellaneous fixes

[GIT PULL] afs: Miscellaneous fixes

[David Howells]

Hi Linus,

Could you pull these three miscellaneous fixes to the afs filesystem:

 (1) Remove some struct members that aren't used, aren't set or aren't
     read, plus a wake up that nothing ever waits for.

 (2) Actually set the AFS_SERVER_FL_HAVE_EPOCH flag so that the code that
     depends on it can work.

 (3) Make a couple of waits uninterruptible if they're done for an
     operation that isn't supposed to be interruptible.

Thanks,
David
---
The following changes since commit ae83d0b416db002fe95601e7f97f64b59514d936:

  Linux 5.7-rc2 (2020-04-19 14:35:30 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20200424

for you to fetch changes up to c4bfda16d1b40d1c5941c61b5aa336bdd2d9904a:

  afs: Make record checking use TASK_UNINTERRUPTIBLE when appropriate (2020-04-24 16:33:32 +0100)

----------------------------------------------------------------
AFS miscellany

----------------------------------------------------------------
David Howells (3):
      afs: Remove some unused bits
      afs: Fix to actually set AFS_SERVER_FL_HAVE_EPOCH
      afs: Make record checking use TASK_UNINTERRUPTIBLE when appropriate

 fs/afs/cmservice.c | 2 +-
 fs/afs/fs_probe.c  | 5 +----
 fs/afs/internal.h  | 4 +---
 fs/afs/rotate.c    | 6 +++---
 fs/afs/server.c    | 7 ++-----
 fs/afs/vl_rotate.c | 4 ++--
 fs/afs/volume.c    | 8 +++++---
 7 files changed, 15 insertions(+), 21 deletions(-)

Re: [GIT PULL] afs: Miscellaneous fixes

[Linus Torvalds]

On Fri, Apr 24, 2020 at 9:12 AM David Howells <dhowells@redhat.com> wrote:
>
>  (3) Make a couple of waits uninterruptible if they're done for an
>      operation that isn't supposed to be interruptible.

Should they not even be killable?

Anyway, pulled.

             Linus

Re: [GIT PULL] afs: Miscellaneous fixes

[pr-tracker-bot]

The pull request you sent on Fri, 24 Apr 2020 17:12:22 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20200424

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/9a195628522c08f36b3bbd0df96582a07ab272bf

Thank you!

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Re: [GIT PULL] afs: Miscellaneous fixes

[pr-tracker-bot]

The pull request you sent on Fri, 24 Nov 2023 15:52:20 +0000:

> git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20231124

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/5b7ad877e4d81f8904ce83982b1ba5c6e83deccb

Thank you!

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Re: [GIT PULL] afs: Miscellaneous fixes

[Linus Torvalds]

On Fri, 24 Nov 2023 at 07:52, David Howells <dhowells@redhat.com> wrote:
> Btw, I did want to ask about (5): Does a superblock being marked SB_RDONLY
> imply immutability to the application?

Obviously not - any network filesystem can and will change from under
you, even if the local copy is read-only.

So SB_RDONLY can only mean that writes to that instance of the
filesystem will fail.

It's a bit stronger than MNT_READONLY, in that for a *local*
filesystem, SB_RDONLY tends to mean that it's truly immutable (while
MNT_READONLY is obviously per mount) but even then some sub-mount
thing (and I guess the AFS snapshot is a good example of that) might
expose the same filesystem through multiple superblocks.

Exactly like a network filesystem inevitably will.

In any case, any user space that thinks SB_RDONLY is some kind of
immutability signal is clearly buggy. At a minimum, such user space
would have to limit itself to particular filesystem types and say "I
know _this_ filesystem can have only one superblock"). And I'd argue
that while that might work in practice, it's insane.

                Linus

[GIT PULL] afs: Miscellaneous fixes

[David Howells]

Hi Linus,

Here are a set of miscellaneous small fixes to the afs filesystem
including:

 (1) Fix the afs_server_list struct to be cleaned up with RCU.

 (2) Fix afs to translate a no-data result from a DNS lookup into ENOENT,
     not EDESTADDRREQ for consistency with OpenAFS.

 (3) Fix afs to translate a negative DNS lookup result into ENOENT rather
     than EDESTADDRREQ.

 (4) Fix file locking on R/O volumes to operate in local mode as the server
     doesn't handle exclusive locks on such files.

 (5) Set SB_RDONLY on superblocks for RO and Backup volumes so that the VFS
     can see that they're read only.

Btw, I did want to ask about (5): Does a superblock being marked SB_RDONLY
imply immutability to the application?  A 'read only' AFS volume is a snapshot
of a writable volume and can be updated.  It's only read-only in the sense you
can't perform normal filesystem modification ops on it.

Link: https://lore.kernel.org/r/20231116155312.156593-1-dhowells@redhat.com/ # v1
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>

Thanks,
David

---
The following changes since commit 76df934c6d5f5c93ba7a0112b1818620ddc10b19:

  MAINTAINERS: Add netdev subsystem profile link (2023-11-17 03:44:21 +0000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20231124

for you to fetch changes up to 68516f60c1d8b0a71e516d630f66b99cb50e0150:

  afs: Mark a superblock for an R/O or Backup volume as SB_RDONLY (2023-11-24 14:52:24 +0000)

----------------------------------------------------------------
AFS Fixes

----------------------------------------------------------------
David Howells (5):
      afs: Fix afs_server_list to be cleaned up with RCU
      afs: Make error on cell lookup failure consistent with OpenAFS
      afs: Return ENOENT if no cell DNS record can be found
      afs: Fix file locking on R/O volumes to operate in local mode
      afs: Mark a superblock for an R/O or Backup volume as SB_RDONLY

 fs/afs/dynroot.c     |  4 ++--
 fs/afs/internal.h    |  1 +
 fs/afs/server_list.c |  2 +-
 fs/afs/super.c       |  4 ++++
 fs/afs/vl_rotate.c   | 10 ++++++++++
 5 files changed, 18 insertions(+), 3 deletions(-)

Re: [GIT PULL] afs: Miscellaneous fixes

[pr-tracker-bot]

The pull request you sent on Wed, 21 Jul 2021 15:22:06 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20210721

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/b4e62aaf95e8a340f3a6e0e2fc9a649f875034b3

Thank you!

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[GIT PULL] afs: Miscellaneous fixes

[David Howells]

Hi Linus,

Can you pull these miscellaneous fixes for afs please?

 (1) Fix a tracepoint that causes one of the tracing subsystem query files
     to crash if the module is loaded[1].

 (2) Fix afs_writepages() to take account of whether the storage rpc
     actually succeeded when updating the cyclic writeback counter[2].

 (3) Fix some error code propagation/handling[3].

 (4) Fix place where afs_writepages() was setting writeback_index to a file
     position rather than a page index[4].

Changes
=======

ver #2:
   - Fix an additional case of afs_writepages() setting writeback_index on
     error[4].
   - Fix afs_writepages() setting writeback_index to a file pos[4].

Thanks,
David

Link: https://lore.kernel.org/r/162430903582.2896199.6098150063997983353.stgit@warthog.procyon.org.uk/ [1]
Link: https://lore.kernel.org/r/20210430155031.3287870-1-trix@redhat.com [2]
Link: https://lore.kernel.org/r/1619691492-83866-1-git-send-email-jiapeng.chong@linux.alibaba.com [3]
Link: https://lore.kernel.org/r/CAB9dFdvHsLsw7CMnB+4cgciWDSqVjuij4mH3TaXnHQB8sz5rHw@mail.gmail.com/ [4]
Link: https://lore.kernel.org/r/162609463116.3133237.11899334298425929820.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/162610726011.3408253.2771348573083023654.stgit@warthog.procyon.org.uk/ # v2

---
The following changes since commit e73f0f0ee7541171d89f2e2491130c7771ba58d3:

  Linux 5.14-rc1 (2021-07-11 15:07:40 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20210721

for you to fetch changes up to b428081282f85db8a0d4ae6206a8c39db9c8341b:

  afs: Remove redundant assignment to ret (2021-07-21 15:11:22 +0100)

----------------------------------------------------------------
AFS fixes

----------------------------------------------------------------
David Howells (2):
      afs: Fix tracepoint string placement with built-in AFS
      afs: Fix setting of writeback_index

Jiapeng Chong (1):
      afs: Remove redundant assignment to ret

Tom Rix (1):
      afs: check function return

 fs/afs/cmservice.c         | 25 +++++------------
 fs/afs/dir.c               | 10 ++++---
 fs/afs/write.c             | 18 ++++++++-----
 include/trace/events/afs.h | 67 ++++++++++++++++++++++++++++++++++++++++++----
 4 files changed, 87 insertions(+), 33 deletions(-)

Re: [GIT PULL] afs: Miscellaneous fixes

[pr-tracker-bot]

The pull request you sent on Wed, 11 Dec 2019 21:17:57 +0000:

> git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20191211

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/ae4b064e2a616b545acf02b8f50cc513b32c7522

Thank you!

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[GIT PULL] afs: Miscellaneous fixes

[David Howells]

Hi Linus,

Can you pull these fixes for AFS plus one patch to make debugging easier:

 (1) Fix how addresses are matched to server records.  This is currently
     incorrect which means cache invalidation callbacks from the server
     don't necessarily get delivered correctly.  This causes stale data and
     metadata to be seen under some circumstances.

 (2) Make the dynamic root superblock R/W so that rpm/dnf can reapply the
     SELinux label to it when upgrading the Fedora filesystem-afs package.
     If the filesystem is R/O, this fails and the upgrade fails.

     It might be better in future to allow setxattr from an LSM to bypass
     the R/O protections, if only for pseudo-filesystems.

 (3) Fix the parsing of mountpoint strings.  The mountpoint object has to
     have a terminal dot, whereas the source/device string passed to mount
     should not.  This confuses type-forcing suffix detection leading to
     the wrong volume variant being mounted.

 (4) Make lookups in the dynamic root superblock for creation events (such
     as mkdir) fail with EOPNOTSUPP rather than something like EEXIST.  The
     dynamic root only allows implicit creation by the ->lookup() method -
     and only if the target cell exists.

 (5) Fix the looking up of an AFS superblock to include the cell in the
     matching key - otherwise all volumes with the same ID number are
     treated as the same thing, irrespective of which cell they're in.

 (6) Show the volume name of each volume in the volume records displayed in
     /proc/net/afs/<cell>/volumes.  This proved useful in debugging (5) as
     it provides a way to map the volume IDs to names, where the names are
     what appear in /proc/mounts.

Patch (6) can be dropped and deferred to the next merge window if you'd
prefer as it's not strictly a fix.

David
---
The following changes since commit e42617b825f8073569da76dc4510bfa019b1c35a:

  Linux 5.5-rc1 (2019-12-08 14:57:55 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-fixes-20191211

for you to fetch changes up to 50559800b76a7a2a46da303100da639536261808:

  afs: Show volume name in /proc/net/afs/<cell>/volumes (2019-12-11 17:48:20 +0000)

----------------------------------------------------------------
AFS fixes

----------------------------------------------------------------
David Howells (5):
      afs: Fix SELinux setting security label on /afs
      afs: Fix mountpoint parsing
      afs: Fix creation calls in the dynamic root to fail with EOPNOTSUPP
      afs: Fix missing cell comparison in afs_test_super()
      afs: Show volume name in /proc/net/afs/<cell>/volumes

Marc Dionne (1):
      afs: Fix afs_find_server lookups for ipv4 peers

 fs/afs/dynroot.c |  3 +++
 fs/afs/mntpt.c   |  6 ++++--
 fs/afs/proc.c    |  7 ++++---
 fs/afs/server.c  | 21 ++++++++-------------
 fs/afs/super.c   |  2 +-
 5 files changed, 20 insertions(+), 19 deletions(-)