CVS commit: src/external/cddl/osnet/dist/uts/common/fs/zfs

["YAMAMOTO Takashi" <yamt%netbsd.org@localhost>]

Module Name:    src
Committed By:   yamt
Date:           Sun Mar 15 11:08:31 UTC 2026

Modified Files:
        src/external/cddl/osnet/dist/uts/common/fs/zfs: zfs_vfsops.c

Log Message:
zfs: purge name cache on teardown

this fixes name cache inconsistencies on
certain events. eg. rollback

```
zfs create $FS
echo a > /$FS/a.txt
echo b > /$FS/b.txt
echo c > /$FS/c.txt
zfs snap $FS@2
rm /$FS/b.txt
cat /$FS/a.txt
cat /$FS/b.txt || :  # create negative cache entry
cat /$FS/c.txt
zfs rollback $FS@2
cat /$FS/a.txt
cat /$FS/b.txt  # hit the negative cache entry because of the bug
cat /$FS/c.txt
```


To generate a diff of this commit:
cvs rdiff -u -r1.30 -r1.31 \
    src/external/cddl/osnet/dist/uts/common/fs/zfs/zfs_vfsops.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.