[GIT PULL] 9p fixes for 7.2-rc1

[Dominique Martinet <asmadeus@codewreck.org>]

Hi Linus,

same report as usual with barely keeping up: there's actually another
half a dozen of LLM patches I didn't pick up for this cycle and will try
to find time to review for next one, and I'm not as happy as I want to
be about how thoroughly I've checked the patches that did get in (please
let me know if you'd rather I drop the "fix infinite loop in
p9_client_rpc on fatal signal" patch I mentioned in the tag, I think
the patch should be ok, but I don't necessarily judge the risk the same
as you would)

The commit date being a bit earlier today was just me dropping a commit
I hadn't intended to send, nothing else was reworked recently.

-------
The following changes since commit 8fc518e489c1386fd0cf7f4256d055960ed6a2e4:

  9p/trans_xen: replace simple_strto* with kstrtouint (2026-04-16 02:57:01 +0000)

are available in the Git repository at:

  https://github.com/martinetd/linux tags/9p-for-7.2-rc1

for you to fetch changes up to aa88278693cbfaf7a2acf961379973fbb63b165c:

  9p: Add missing read barrier in virtio zero-copy path (2026-06-21 05:22:57 +0000)

----------------------------------------------------------------
Asides of the avalanche of LLM-driven fixes, there are a couple of
big changes this cycle:

- negative dentry and symlink cache
- a way out of the unkillable "io_wait_event_killable" (because it
  looped around waiting for the request flush to come back from
  server; this has been bugging syzcaller folks since forever):
  I'm still not 100% sure about this patch, but I think it's as
  good as we'll ever get, and will keep testing a bit further in the
  coming weeks

The rest is more noisy than usual, but shouldn't cause any trouble.

----------------------------------------------------------------
Aayush Patil (1):
      docs/filesystems/9p: fix broken external links

Breno Leitao (1):
      9p: skip nlink update in cacheless mode to fix WARN_ON

Christophe JAILLET (1):
      net/9p/usbg: Constify struct configfs_item_operations

David Laight (1):
      net/9p: Replace strlen() strcpy() pair with strscpy()

Dominique Martinet (1):
      9p: v9fs_file_do_lock: replace WARN_ONCE with p9_debug

Gui-Dong Han (1):
      9p: Add missing read barrier in virtio zero-copy path

Hongling Zeng (1):
      9p: avoid returning ERR_PTR(0) from mkdir operations

Pierre Barre (2):
      9p: use kvzalloc for readdir buffer
      9p: invalidate readdir buffer on seek

Remi Pommarel (4):
      9p: Cache negative dentries for lookup performance
      9p: Add mount option for negative dentry cache retention
      9p: Set default negative dentry retention time for cache=loose
      9p: Enable symlink caching in page cache

Vasiliy Kovalev (1):
      net/9p: fix infinite loop in p9_client_rpc on fatal signal

Yizhou Zhao (2):
      9p: avoid putting oldfid in p9_client_walk() error path
      net/9p: fix race condition on rdma->state in trans_rdma.c

 Documentation/filesystems/9p.rst |  10 +++++---
 fs/9p/fid.c                      |  11 +++++----
 fs/9p/v9fs.c                     |  27 ++++++++++++++++++++-
 fs/9p/v9fs.h                     |  28 +++++++++++++--------
 fs/9p/v9fs_vfs.h                 |  15 ++++++++++++
 fs/9p/vfs_addr.c                 |  36 +++++++++++++++++++++++++--
 fs/9p/vfs_dentry.c               | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------
 fs/9p/vfs_dir.c                  |  14 ++++++++++-
 fs/9p/vfs_file.c                 |   2 +-
 fs/9p/vfs_inode.c                |  46 ++++++++++++++++++++---------------
 fs/9p/vfs_inode_dotl.c           |  58 ++++++++++++++++++++++++++++++++++++++------
 fs/9p/vfs_super.c                |   1 +
 include/net/9p/client.h          |   2 ++
 net/9p/client.c                  |   7 ++++--
 net/9p/trans_fd.c                |   6 ++---
 net/9p/trans_rdma.c              |  19 +++++++++++++--
 net/9p/trans_usbg.c              |   2 +-
 net/9p/trans_virtio.c            |   5 ++++
 18 files changed, 320 insertions(+), 74 deletions(-)

-- 
Dominique Martinet | Asmadeus