Merge tag '9p-for-7.2-rc1' of https://github.com/martinetd/linux

Pull 9p updates from Dominique Martinet:
 "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"

* tag '9p-for-7.2-rc1' of https://github.com/martinetd/linux:
  9p: Add missing read barrier in virtio zero-copy path
  net/9p: Replace strlen() strcpy() pair with strscpy()
  9p: skip nlink update in cacheless mode to fix WARN_ON
  net/9p: fix race condition on rdma->state in trans_rdma.c
  9p: v9fs_file_do_lock: replace WARN_ONCE with p9_debug
  9p: Enable symlink caching in page cache
  9p: Set default negative dentry retention time for cache=loose
  9p: Add mount option for negative dentry cache retention
  9p: Cache negative dentries for lookup performance
  9p: avoid returning ERR_PTR(0) from mkdir operations
  9p: avoid putting oldfid in p9_client_walk() error path
  net/9p: fix infinite loop in p9_client_rpc on fatal signal
  docs/filesystems/9p: fix broken external links
  9p: invalidate readdir buffer on seek
  9p: use kvzalloc for readdir buffer
  net/9p/usbg: Constify struct configfs_item_operations

1 files changed, 6 insertions, 4 deletions

diff --git a/Documentation/filesystems/9p.rst b/Documentation/filesystems/9p.rst
index be3504ca034a..3f65db648db0 100644
--- a/Documentation/filesystems/9p.rst
+++ b/Documentation/filesystems/9p.rst
@@ -23,13 +23,10 @@ the 9p client is available in the form of a USENIX paper:
 Other applications are described in the following papers:
 
 	* XCPU & Clustering
-	  http://xcpu.org/papers/xcpu-talk.pdf
 	* KVMFS: control file system for KVM
-	  http://xcpu.org/papers/kvmfs.pdf
 	* CellFS: A New Programming Model for the Cell BE
-	  http://xcpu.org/papers/cellfs-talk.pdf
 	* PROSE I/O: Using 9p to enable Application Partitions
-	  http://plan9.escet.urjc.es/iwp9/cready/PROSE_iwp9_2006.pdf
+	  http://web.archive.org/web/20110101152020/http://plan9.escet.urjc.es/iwp9/cready/PROSE_iwp9_2006.pdf
 	* VirtFS: A Virtualization Aware File System pass-through
 	  https://kernel.org/doc/ols/2010/ols2010-pages-109-120.pdf
 
@@ -238,6 +235,11 @@ Options
   cachetag	cache tag to use the specified persistent cache.
 		cache tags for existing cache sessions can be listed at
 		/sys/fs/9p/caches. (applies only to cache=fscache)
+
+  negtimeout    the duration (in milliseconds) that negative dentries (paths
+                that do not actually exist) are retained in the cache. If
+                set to a negative value, those entries are kept indefinitely
+                until evicted by the buffer cache management system
   ============= ===============================================================
 
 Behavior