[PATCH 0/4] netfs: Yet further miscellaneous fixes

[David Howells <dhowells@redhat.com>]

Hi Christian,

Here are yet more miscellaneous fixes for netfslib, one found by Mark Brown
when integrating linux-next and the rest found by Sashiko.dev's AI review[1]:

 (1) Fix a return statement that should have been removed from
     netfs_read_sizes() and only happens on 32-bit SMP.

 (2) Fix read and write result collection use barriering correctly to
     access a request's subrequest lists without taking a lock.

     This adds list_add_tail_release() and list_first_entry_acquire() to
     appropriate incorporate barriering into some list functions.

 (3) Fix afs_get_link() to take the vnode->validate_lock around
     afs_read_single() to prevent a race with another caller of
     afs_get_link() also trying to read the symlink content.

 (4) Fix the RCU handling of symlinks in RCU pathwalk.  The problems were
     that afs_get_link() didn't use proper RCU pointer dereferencing and
     that AFS symlinks can be updated remotely, potentially causing the
     buffer memory to be changed.

These are applied on top of your vfs.fixes branch.  Patch 1 should fix the
problem in linux-next integration.

The patches can also be found here:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=netfs-fixes

Thanks,
David

[1] https://sashiko.dev/#/patchset/20260326104544.509518-1-dhowells%40redhat.com

base-commit: 986563b3799fee66965811df3f46f5bb76736084

David Howells (4):
  netfs: Fix wrong return from netfs_read_sizes() on 32-bit SMP arches
  netfs: Fix missing barriers when accessing stream->subrequests
    locklessly
  afs: Fix afs_get_link() to take validate_lock around afs_read_single()
  afs: Fix RCU handling of symlinks in RCU pathwalk

 fs/afs/Makefile          |   1 +
 fs/afs/dir.c             |  33 ++++--
 fs/afs/fsclient.c        |   4 +-
 fs/afs/inode.c           |  96 +---------------
 fs/afs/internal.h        |  35 ++++--
 fs/afs/symlink.c         | 242 +++++++++++++++++++++++++++++++++++++++
 fs/afs/yfsclient.c       |   4 +-
 fs/netfs/buffered_read.c |   9 +-
 fs/netfs/direct_read.c   |  15 +--
 fs/netfs/internal.h      |   3 +
 fs/netfs/read_collect.c  |   4 +-
 fs/netfs/read_single.c   |  12 +-
 fs/netfs/write_collect.c |   4 +-
 fs/netfs/write_issue.c   |   3 +-
 include/linux/list.h     |  37 ++++++
 include/linux/netfs.h    |   1 -
 16 files changed, 358 insertions(+), 145 deletions(-)
 create mode 100644 fs/afs/symlink.c