The branch main has been updated by rmacklem:
URL:
https://cgit.FreeBSD.org/src/commit/?id=d00c64bb2347cc620d31a178c7755aa7e594f065
commit d00c64bb2347cc620d31a178c7755aa7e594f065
Author: Zaphrod Beeblebrox <zbee...@gmail.com>
AuthorDate: 2024-04-11 20:27:27 +0000
Commit: Rick Macklem <rmack...@freebsd.org>
CommitDate: 2024-04-11 20:27:27 +0000
nfscl: Purge name cache when readdir_plus is done
The author reported that this patch was needed to avoid
crashes on a fairly busy RISC-V system. The author did not
provide details w.r.t. the crashes. Although I
have not seen any such crash, the patch looks reasonable
and I have not found any regressions when testing it.
Since "rdirplus" is not a default option, the patch is
only needed if you are doing NFS mounts with the "rdirplus"
mount option and seeing crashes related to the name cache.
MFC after: 1 week
---
sys/fs/nfsclient/nfs_clvnops.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/sys/fs/nfsclient/nfs_clvnops.c b/sys/fs/nfsclient/nfs_clvnops.c
index 0b8c587a542c..85c0ebd7a10f 100644
--- a/sys/fs/nfsclient/nfs_clvnops.c
+++ b/sys/fs/nfsclient/nfs_clvnops.c
@@ -2459,6 +2459,16 @@ nfs_readdir(struct vop_readdir_args *ap)
return (EINVAL);
uio->uio_resid -= left;
+ /*
+ * For readdirplus, if starting to read the directory,
+ * purge the name cache, since it will be reloaded by
+ * this directory read.
+ * This removes potentially stale name cache entries.
+ */
+ if (uio->uio_offset == 0 &&
+ (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_RDIRPLUS) != 0)
+ cache_purge(vp);
+
/*
* Call ncl_bioread() to do the real work.
*/
