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Looks like rhel9 nfs-utils doesn't have this patch yet:
[root@rhel-9-latest ~]# exportfs -ua && exportfs localhost:/
[root@rhel-9-latest ~]# exportfs -s
/ localhost(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
[root@rhel-9-latest ~]# exportfs -u localhost:/
exportfs: Could not find 'localhost:/' to unexport. <<<<<<<<<<<<
[root@rhel-9-latest ~]# exportfs -s
/ localhost(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
[root@rhel-9-latest ~]#
[root@rhel-9-latest ~]# rpm -q nfs-utils
nfs-utils-2.5.2-1.rc4.el9.x86_64
[root@rhel-9-latest ~]#
+++ This bug was initially created as a clone of Bug #1944119 +++
Description of problem:
If root is exported, we're unable to unexport it individually :
[root@rhel8 ~]# exportfs -s
/opt/mydir 172.23.0.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
/opt/mydir/subdir 172.23.0.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
/opt/mydir *(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
/opt/mydir/subdir *(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
[root@rhel8 ~]# exportfs -i -o rw,sync 172.23.1.247:/
[root@rhel8 ~]# exportfs -s
/ 172.23.1.247(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,root_squash,no_all_squash)
/opt/mydir/subdir 172.23.0.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
/opt/mydir 172.23.0.0/24(sync,wdelay,hide,no_subtree_check,sec=sys,ro,secure,root_squash,no_all_squash)
/opt/mydir/subdir *(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
/opt/mydir *(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
[root@rhel8 ~]# exportfs -v -u 172.23.1.247:/
exportfs: Could not find '172.23.1.247:/' to unexport.
- exportfs -au works
- exporting a bind mount of root & unexport it works
I think problem is here :
355 static void
356 unexportfs_parsed(char *hname, char *path, int verbose)
357 {
...
369 /*
370 * It's possible the specified path ends with a '/'. But
371 * the entry from exportlist won't has the trailing '/',
372 * so need to deal with it.
373 */
374 size_t nlen = strlen(path);
375 while (path[nlen - 1] == '/') <<--- [*]
376 nlen--;
377
378 for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
379 if (strlen(exp->m_export.e_path) != nlen)
380 continue;
381 if (path && strncmp(path, exp->m_export.e_path, nlen))
382 continue;
while removing the trailing "/" from the path, for root case, we'll leave nlen at 0,
so we will loop through exportlist without finding "/".
quick patch :
diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index 262dd19a..40813fb8 100644
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -383,7 +383,7 @@ unexportfs_parsed(char *hname, char *path, int verbose)
* so need to deal with it.
*/
size_t nlen = strlen(path);
- while (path[nlen - 1] == '/')
+ while ((path[nlen - 1] == '/') && (nlen > 1))
nlen--;
for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
seems to work :
[root@f-rawhide exportfs]# ./exportfs -i -o rw,sync *:/
[root@f-rawhide exportfs]# ./exportfs -s
/ *(sync,wdelay,hide,no_subtree_check,sec=sys,rw,secure,root_squash,no_all_squash)
[root@f-rawhide exportfs]# ./exportfs -v -u *:/
unexporting *:/
[root@f-rawhide exportfs]# ./exportfs -s
[root@f-rawhide exportfs]#
Version-Release number of selected component (if applicable):
How reproducible: 100%
Steps to Reproduce:
1. see above
2.
3.
Actual results: not able to indivually unexport root
Expected results: able to indivually unexport root