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libzfs/mnttab: lift mnttab cache into separate file
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
Brian Behlendorf
parent
ae7fcd5f92
commit
02224bca40
@ -16,6 +16,7 @@ dist_libzfs_la_SOURCES = \
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%D%/libzfs_diff.c \
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%D%/libzfs_diff.c \
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%D%/libzfs_import.c \
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%D%/libzfs_import.c \
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%D%/libzfs_iter.c \
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%D%/libzfs_iter.c \
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%D%/libzfs_mnttab.c \
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%D%/libzfs_mount.c \
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%D%/libzfs_mount.c \
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%D%/libzfs_pool.c \
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%D%/libzfs_pool.c \
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%D%/libzfs_share.c \
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%D%/libzfs_share.c \
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@ -806,190 +806,6 @@ zfs_close(zfs_handle_t *zhp)
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free(zhp);
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free(zhp);
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}
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}
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typedef struct mnttab_node {
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struct mnttab mtn_mt;
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avl_node_t mtn_node;
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} mnttab_node_t;
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static int
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libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
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{
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const mnttab_node_t *mtn1 = (const mnttab_node_t *)arg1;
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const mnttab_node_t *mtn2 = (const mnttab_node_t *)arg2;
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int rv;
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rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);
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return (TREE_ISIGN(rv));
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}
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void
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libzfs_mnttab_init(libzfs_handle_t *hdl)
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{
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pthread_mutex_init(&hdl->libzfs_mnttab_cache_lock, NULL);
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assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
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avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
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sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
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}
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static int
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libzfs_mnttab_update(libzfs_handle_t *hdl)
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{
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FILE *mnttab;
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struct mnttab entry;
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if ((mnttab = fopen(MNTTAB, "re")) == NULL)
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return (ENOENT);
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while (getmntent(mnttab, &entry) == 0) {
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mnttab_node_t *mtn;
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avl_index_t where;
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if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
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continue;
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mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
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mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
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mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
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mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
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mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
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/* Exclude duplicate mounts */
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if (avl_find(&hdl->libzfs_mnttab_cache, mtn, &where) != NULL) {
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free(mtn->mtn_mt.mnt_special);
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free(mtn->mtn_mt.mnt_mountp);
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free(mtn->mtn_mt.mnt_fstype);
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free(mtn->mtn_mt.mnt_mntopts);
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free(mtn);
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continue;
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}
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avl_add(&hdl->libzfs_mnttab_cache, mtn);
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}
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(void) fclose(mnttab);
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return (0);
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}
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void
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libzfs_mnttab_fini(libzfs_handle_t *hdl)
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{
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void *cookie = NULL;
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mnttab_node_t *mtn;
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while ((mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie))
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!= NULL) {
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free(mtn->mtn_mt.mnt_special);
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free(mtn->mtn_mt.mnt_mountp);
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free(mtn->mtn_mt.mnt_fstype);
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free(mtn->mtn_mt.mnt_mntopts);
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free(mtn);
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}
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avl_destroy(&hdl->libzfs_mnttab_cache);
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(void) pthread_mutex_destroy(&hdl->libzfs_mnttab_cache_lock);
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}
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void
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libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
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{
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hdl->libzfs_mnttab_enable = enable;
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}
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int
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libzfs_mnttab_find(libzfs_handle_t *hdl, const char *fsname,
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struct mnttab *entry)
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{
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FILE *mnttab;
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mnttab_node_t find;
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mnttab_node_t *mtn;
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int ret = ENOENT;
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if (!hdl->libzfs_mnttab_enable) {
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struct mnttab srch = { 0 };
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if (avl_numnodes(&hdl->libzfs_mnttab_cache))
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libzfs_mnttab_fini(hdl);
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if ((mnttab = fopen(MNTTAB, "re")) == NULL)
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return (ENOENT);
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srch.mnt_special = (char *)fsname;
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srch.mnt_fstype = (char *)MNTTYPE_ZFS;
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ret = getmntany(mnttab, entry, &srch) ? ENOENT : 0;
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(void) fclose(mnttab);
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return (ret);
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}
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pthread_mutex_lock(&hdl->libzfs_mnttab_cache_lock);
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if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0) {
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int error;
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if ((error = libzfs_mnttab_update(hdl)) != 0) {
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pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
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return (error);
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}
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}
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find.mtn_mt.mnt_special = (char *)fsname;
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mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
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if (mtn) {
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*entry = mtn->mtn_mt;
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ret = 0;
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}
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pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
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return (ret);
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}
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void
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libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
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const char *mountp, const char *mntopts)
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{
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mnttab_node_t *mtn;
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pthread_mutex_lock(&hdl->libzfs_mnttab_cache_lock);
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if (avl_numnodes(&hdl->libzfs_mnttab_cache) != 0) {
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mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
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mtn->mtn_mt.mnt_special = zfs_strdup(hdl, special);
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mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, mountp);
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mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, MNTTYPE_ZFS);
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mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, mntopts);
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/*
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* Another thread may have already added this entry
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* via libzfs_mnttab_update. If so we should skip it.
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*/
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if (avl_find(&hdl->libzfs_mnttab_cache, mtn, NULL) != NULL) {
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free(mtn->mtn_mt.mnt_special);
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free(mtn->mtn_mt.mnt_mountp);
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free(mtn->mtn_mt.mnt_fstype);
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free(mtn->mtn_mt.mnt_mntopts);
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free(mtn);
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} else {
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avl_add(&hdl->libzfs_mnttab_cache, mtn);
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}
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}
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pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
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}
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void
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libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
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{
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mnttab_node_t find;
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mnttab_node_t *ret;
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pthread_mutex_lock(&hdl->libzfs_mnttab_cache_lock);
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find.mtn_mt.mnt_special = (char *)fsname;
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if ((ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL))
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!= NULL) {
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avl_remove(&hdl->libzfs_mnttab_cache, ret);
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free(ret->mtn_mt.mnt_special);
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free(ret->mtn_mt.mnt_mountp);
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free(ret->mtn_mt.mnt_fstype);
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free(ret->mtn_mt.mnt_mntopts);
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free(ret);
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}
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pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
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}
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int
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int
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zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
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zfs_spa_version(zfs_handle_t *zhp, int *spa_version)
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{
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{
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226
lib/libzfs/libzfs_mnttab.c
Normal file
226
lib/libzfs/libzfs_mnttab.c
Normal file
@ -0,0 +1,226 @@
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// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2019 Joyent, Inc.
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* Copyright (c) 2011, 2020 by Delphix. All rights reserved.
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* Copyright (c) 2012 DEY Storage Systems, Inc. All rights reserved.
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* Copyright (c) 2012 Pawel Jakub Dawidek <pawel@dawidek.net>.
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* Copyright (c) 2013 Martin Matuska. All rights reserved.
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* Copyright (c) 2013 Steven Hartland. All rights reserved.
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* Copyright 2017 Nexenta Systems, Inc.
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* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
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* Copyright 2017-2018 RackTop Systems.
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* Copyright (c) 2019 Datto Inc.
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* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>
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* Copyright (c) 2021 Matt Fiddaman
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* Copyright (c) 2026, TrueNAS.
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*/
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#include <sys/mntent.h>
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#include <libzfs.h>
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#include "libzfs_impl.h"
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typedef struct mnttab_node {
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struct mnttab mtn_mt;
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avl_node_t mtn_node;
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} mnttab_node_t;
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static int
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libzfs_mnttab_cache_compare(const void *arg1, const void *arg2)
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{
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const mnttab_node_t *mtn1 = (const mnttab_node_t *)arg1;
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const mnttab_node_t *mtn2 = (const mnttab_node_t *)arg2;
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int rv;
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rv = strcmp(mtn1->mtn_mt.mnt_special, mtn2->mtn_mt.mnt_special);
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return (TREE_ISIGN(rv));
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}
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void
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libzfs_mnttab_init(libzfs_handle_t *hdl)
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{
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pthread_mutex_init(&hdl->libzfs_mnttab_cache_lock, NULL);
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assert(avl_numnodes(&hdl->libzfs_mnttab_cache) == 0);
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avl_create(&hdl->libzfs_mnttab_cache, libzfs_mnttab_cache_compare,
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sizeof (mnttab_node_t), offsetof(mnttab_node_t, mtn_node));
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}
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static int
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libzfs_mnttab_update(libzfs_handle_t *hdl)
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{
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FILE *mnttab;
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struct mnttab entry;
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if ((mnttab = fopen(MNTTAB, "re")) == NULL)
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return (ENOENT);
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while (getmntent(mnttab, &entry) == 0) {
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mnttab_node_t *mtn;
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avl_index_t where;
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if (strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
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continue;
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mtn = zfs_alloc(hdl, sizeof (mnttab_node_t));
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mtn->mtn_mt.mnt_special = zfs_strdup(hdl, entry.mnt_special);
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mtn->mtn_mt.mnt_mountp = zfs_strdup(hdl, entry.mnt_mountp);
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mtn->mtn_mt.mnt_fstype = zfs_strdup(hdl, entry.mnt_fstype);
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mtn->mtn_mt.mnt_mntopts = zfs_strdup(hdl, entry.mnt_mntopts);
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/* Exclude duplicate mounts */
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if (avl_find(&hdl->libzfs_mnttab_cache, mtn, &where) != NULL) {
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free(mtn->mtn_mt.mnt_special);
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free(mtn->mtn_mt.mnt_mountp);
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free(mtn->mtn_mt.mnt_fstype);
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free(mtn->mtn_mt.mnt_mntopts);
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free(mtn);
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continue;
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}
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avl_add(&hdl->libzfs_mnttab_cache, mtn);
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}
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(void) fclose(mnttab);
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return (0);
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}
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void
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libzfs_mnttab_fini(libzfs_handle_t *hdl)
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{
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void *cookie = NULL;
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mnttab_node_t *mtn;
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while ((mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie))
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!= NULL) {
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free(mtn->mtn_mt.mnt_special);
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free(mtn->mtn_mt.mnt_mountp);
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free(mtn->mtn_mt.mnt_fstype);
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free(mtn->mtn_mt.mnt_mntopts);
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free(mtn);
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}
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avl_destroy(&hdl->libzfs_mnttab_cache);
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(void) pthread_mutex_destroy(&hdl->libzfs_mnttab_cache_lock);
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}
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void
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libzfs_mnttab_cache(libzfs_handle_t *hdl, boolean_t enable)
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{
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hdl->libzfs_mnttab_enable = enable;
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}
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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);
|
||||||
|
}
|
||||||
|
|
||||||
|
pthread_mutex_lock(&hdl->libzfs_mnttab_cache_lock);
|
||||||
|
if (avl_numnodes(&hdl->libzfs_mnttab_cache) == 0) {
|
||||||
|
int error;
|
||||||
|
|
||||||
|
if ((error = libzfs_mnttab_update(hdl)) != 0) {
|
||||||
|
pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
|
||||||
|
return (error);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
find.mtn_mt.mnt_special = (char *)fsname;
|
||||||
|
mtn = avl_find(&hdl->libzfs_mnttab_cache, &find, NULL);
|
||||||
|
if (mtn) {
|
||||||
|
*entry = mtn->mtn_mt;
|
||||||
|
ret = 0;
|
||||||
|
}
|
||||||
|
pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
|
||||||
|
return (ret);
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
libzfs_mnttab_add(libzfs_handle_t *hdl, const char *special,
|
||||||
|
const char *mountp, const char *mntopts)
|
||||||
|
{
|
||||||
|
mnttab_node_t *mtn;
|
||||||
|
|
||||||
|
pthread_mutex_lock(&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);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
|
||||||
|
{
|
||||||
|
mnttab_node_t find;
|
||||||
|
mnttab_node_t *ret;
|
||||||
|
|
||||||
|
pthread_mutex_lock(&hdl->libzfs_mnttab_cache_lock);
|
||||||
|
find.mtn_mt.mnt_special = (char *)fsname;
|
||||||
|
if ((ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL))
|
||||||
|
!= NULL) {
|
||||||
|
avl_remove(&hdl->libzfs_mnttab_cache, ret);
|
||||||
|
free(ret->mtn_mt.mnt_special);
|
||||||
|
free(ret->mtn_mt.mnt_mountp);
|
||||||
|
free(ret->mtn_mt.mnt_fstype);
|
||||||
|
free(ret->mtn_mt.mnt_mntopts);
|
||||||
|
free(ret);
|
||||||
|
}
|
||||||
|
pthread_mutex_unlock(&hdl->libzfs_mnttab_cache_lock);
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user