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libzfs/mnttab: always enable the cache

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There's no real reason not to enable it always; the `zfs` command always
enables it anyway, and right now there's multiple places that do mount
work that don't go through the cache anyway. Having it always be on lets
us remove a bunch of the fallback code.

Sponsored-by: TrueNAS
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@truenas.com>
Closes #18296
This commit is contained in:
Rob Norris 2026-02-19 11:12:17 +11:00 committed by Brian Behlendorf
parent b5637fba1c
commit 0ecf5e3f62
3 changed files with 22 additions and 39 deletions
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1
cmd/zfs/zfs_main.c
View File

@ -9426,7 +9426,6 @@ main(int argc, char **argv)
/*
* Run the appropriate command.
*/
libzfs_mnttab_cache(g_zfs, B_TRUE);
if (find_command_idx(cmdname, &i) == 0) {
current_command = &command_table[i];
ret = command_table[i].func(argc - 1, newargv + 1);

1
lib/libzfs/libzfs_impl.h
View File

@ -58,7 +58,6 @@ struct libzfs_handle {
char libzfs_action[1024];
char libzfs_desc[1024];
int libzfs_printerr;
boolean_t libzfs_mnttab_enable;
/*
* We need a lock to handle the case where parallel mount
* threads are populating the mnttab cache simultaneously. The

59
lib/libzfs/libzfs_mnttab.c
View File

@ -130,34 +130,18 @@ libzfs_mnttab_fini(libzfs_handle_t *hdl)
void
libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
{
hdl->libzfs_mnttab_enable = enable;
/* This is a no-op to preserve ABI backward compatibility. */
(void) hdl, (void) enable;
}
int
libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
struct mnttab *entry)
{
FILE *mnttab;
mnttab_node_t find;
mnttab_node_t *mtn;
int ret = ENOENT;
if (!hdl->libzfs_mnttab_enable) {
struct mnttab srch = { 0 };
if (avl_numnodes(&hdl->libzfs_mnttab_cache))
libzfs_mnttab_fini(hdl);
if ((mnttab = fopen(MNTTAB, "re")) == NULL)
return (ENOENT);
srch.mnt_special = (char *)fsname;
srch.mnt_fstype = (char *)MNTTYPE_ZFS;
ret = getmntany(mnttab, entry, &srch) ? ENOENT : 0;
(void) fclose(mnttab);
return (ret);
}
mutex_enter(&hdl->libzfs_mnttab_cache_lock);
if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0) {
int error;
@ -185,26 +169,27 @@ libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
mnttab_node_t *mtn;
mutex_enter(&hdl->libzfs_mnttab_cache_lock);
if (avl_numnodes(&hdl->libzfs_mnttab_cache) != 0) {
mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
/*
* Another thread may have already added this entry
* via libzfs_mnttab_update. If so we should skip it.
*/
if (avl_find(&hdl->libzfs_mnttab_cache, mtn, NULL) != NULL) {
free(mtn->mtn_mt.mnt_special);
free(mtn->mtn_mt.mnt_mountp);
free(mtn->mtn_mt.mnt_fstype);
free(mtn->mtn_mt.mnt_mntopts);
free(mtn);
} else {
avl_add(&hdl->libzfs_mnttab_cache, mtn);
}
mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
/*
* Another thread may have already added this entry
* via libzfs_mnttab_update. If so we should skip it.
*/
if (avl_find(&hdl->libzfs_mnttab_cache, mtn, NULL) != NULL) {
free(mtn->mtn_mt.mnt_special);
free(mtn->mtn_mt.mnt_mountp);
free(mtn->mtn_mt.mnt_fstype);
free(mtn->mtn_mt.mnt_mntopts);
free(mtn);
} else {
avl_add(&hdl->libzfs_mnttab_cache, mtn);
}
mutex_exit(&hdl->libzfs_mnttab_cache_lock);
}