/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 Gunnar Beutner
+ * Copyright (c) 2012 Cyril Plisko. All rights reserved.
*/
#include <stdio.h>
#include <libshare.h>
#include "libshare_impl.h"
+static boolean_t nfs_available(void);
+
static sa_fstype_t *nfs_fstype;
-static boolean_t nfs_available;
/*
* nfs_exportfs_temp_fd refers to a temporary copy of the output
typedef int (*nfs_host_callback_t)(const char *sharepath, const char *host,
const char *security, const char *access, void *cookie);
+/*
+ * Invokes the specified callback function for each Solaris share option
+ * listed in the specified string.
+ */
static int
foreach_nfs_shareopt(const char *shareopts,
nfs_shareopt_callback_t callback, void *cookie)
int was_nul, rc;
if (shareopts == NULL)
- return SA_OK;
+ return (SA_OK);
shareopts_dup = strdup(shareopts);
if (shareopts_dup == NULL)
- return SA_NO_MEMORY;
+ return (SA_NO_MEMORY);
opt = shareopts_dup;
was_nul = 0;
if (rc != SA_OK) {
free(shareopts_dup);
- return rc;
+ return (rc);
}
}
free(shareopts_dup);
- return 0;
+ return (0);
}
typedef struct nfs_host_cookie_s {
const char *security;
} nfs_host_cookie_t;
+/*
+ * Helper function for foreach_nfs_host. This function checks whether the
+ * current share option is a host specification and invokes a callback
+ * function with information about the host.
+ */
static int
foreach_nfs_host_cb(const char *opt, const char *value, void *pcookie)
{
host_dup = strdup(value);
if (host_dup == NULL)
- return SA_NO_MEMORY;
+ return (SA_NO_MEMORY);
host = host_dup;
if (rc != SA_OK) {
free(host_dup);
- return rc;
+ return (rc);
}
host = next;
free(host_dup);
}
- return SA_OK;
+ return (SA_OK);
}
+/*
+ * Invokes a callback function for all NFS hosts that are set for a share.
+ */
static int
foreach_nfs_host(sa_share_impl_t impl_share, nfs_host_callback_t callback,
void *cookie)
&udata);
}
+/*
+ * Converts a Solaris NFS host specification to its Linux equivalent.
+ */
static int
get_linux_hostspec(const char *solaris_hostspec, char **plinux_hostspec)
{
}
if (*plinux_hostspec == NULL) {
- return SA_NO_MEMORY;
+ return (SA_NO_MEMORY);
}
- return SA_OK;
+ return (SA_OK);
}
+/*
+ * Used internally by nfs_enable_share to enable sharing for a single host.
+ */
static int
nfs_enable_share_one(const char *sharepath, const char *host,
const char *security, const char *access, void *pcookie)
{
- pid_t pid;
- int rc, status;
+ int rc;
char *linuxhost, *hostpath, *opts;
const char *linux_opts = (const char *)pcookie;
-
- pid = fork();
-
- if (pid < 0)
- return SA_SYSTEM_ERR;
-
- if (pid > 0) {
- while ((rc = waitpid(pid, &status, 0)) <= 0 && errno == EINTR)
- ; /* empty loop body */
-
- if (rc <= 0)
- return SA_SYSTEM_ERR;
-
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
- return SA_CONFIG_ERR;
-
- return SA_OK;
- }
-
- /* child */
+ char *argv[6];
/* exportfs -i -o sec=XX,rX,<opts> <host>:<sharepath> */
fprintf(stderr, "sharing %s with opts %s\n", hostpath, opts);
#endif
- rc = execlp("/usr/sbin/exportfs", "exportfs", "-i", \
- "-o", opts, hostpath, NULL);
+ argv[0] = "/usr/sbin/exportfs";
+ argv[1] = "-i";
+ argv[2] = "-o";
+ argv[3] = opts;
+ argv[4] = hostpath;
+ argv[5] = NULL;
- if (rc < 0) {
- free(hostpath);
- free(opts);
- exit(1);
- }
+ rc = libzfs_run_process(argv[0], argv, 0);
- exit(0);
+ free(hostpath);
+ free(opts);
+
+ if (rc < 0)
+ return (SA_SYSTEM_ERR);
+ else
+ return (SA_OK);
}
+/*
+ * Adds a Linux share option to an array of NFS options.
+ */
static int
add_linux_shareopt(char **plinux_opts, const char *key, const char *value)
{
(value ? 1 + strlen(value) : 0) + 1);
if (new_linux_opts == NULL)
- return SA_NO_MEMORY;
+ return (SA_NO_MEMORY);
new_linux_opts[len] = '\0';
*plinux_opts = new_linux_opts;
- return SA_OK;
+ return (SA_OK);
}
+/*
+ * Validates and converts a single Solaris share option to its Linux
+ * equivalent.
+ */
static int
get_linux_shareopts_cb(const char *key, const char *value, void *cookie)
{
/* host-specific options, these are taken care of elsewhere */
if (strcmp(key, "ro") == 0 || strcmp(key, "rw") == 0 ||
strcmp(key, "sec") == 0)
- return SA_OK;
+ return (SA_OK);
if (strcmp(key, "anon") == 0)
key = "anonuid";
- if (strcmp(key, "root_mapping") == 0) {
- (void) add_linux_shareopt(plinux_opts, "root_squash", NULL);
- key = "anonuid";
- }
+ if (strcmp(key, "root_mapping") == 0) {
+ (void) add_linux_shareopt(plinux_opts, "root_squash", NULL);
+ key = "anonuid";
+ }
if (strcmp(key, "nosub") == 0)
key = "subtree_check";
strcmp(key, "root_squash") != 0 &&
strcmp(key, "no_root_squash") != 0 &&
strcmp(key, "all_squash") != 0 &&
- strcmp(key, "no_all_squash") != 0 &&
+ strcmp(key, "no_all_squash") != 0 && strcmp(key, "fsid") != 0 &&
strcmp(key, "anonuid") != 0 && strcmp(key, "anongid") != 0) {
- return SA_SYNTAX_ERR;
+ return (SA_SYNTAX_ERR);
}
(void) add_linux_shareopt(plinux_opts, key, value);
- return SA_OK;
+ return (SA_OK);
}
+/*
+ * Takes a string containing Solaris share options (e.g. "sync,no_acl") and
+ * converts them to a NULL-terminated array of Linux NFS options.
+ */
static int
get_linux_shareopts(const char *shareopts, char **plinux_opts)
{
(void) add_linux_shareopt(plinux_opts, "no_root_squash", NULL);
(void) add_linux_shareopt(plinux_opts, "mountpoint", NULL);
- rc = foreach_nfs_shareopt(shareopts, get_linux_shareopts_cb, plinux_opts);
+ rc = foreach_nfs_shareopt(shareopts, get_linux_shareopts_cb,
+ plinux_opts);
if (rc != SA_OK) {
free(*plinux_opts);
*plinux_opts = NULL;
}
- return rc;
+ return (rc);
}
+/*
+ * Enables NFS sharing for the specified share.
+ */
static int
nfs_enable_share(sa_share_impl_t impl_share)
{
char *shareopts, *linux_opts;
int rc;
- if (!nfs_available) {
- return SA_SYSTEM_ERR;
+ if (!nfs_available()) {
+ return (SA_SYSTEM_ERR);
}
shareopts = FSINFO(impl_share, nfs_fstype)->shareopts;
if (shareopts == NULL)
- return SA_OK;
+ return (SA_OK);
rc = get_linux_shareopts(shareopts, &linux_opts);
if (rc != SA_OK)
- return rc;
+ return (rc);
rc = foreach_nfs_host(impl_share, nfs_enable_share_one, linux_opts);
free(linux_opts);
- return rc;
+ return (rc);
}
+/*
+ * Used internally by nfs_disable_share to disable sharing for a single host.
+ */
static int
nfs_disable_share_one(const char *sharepath, const char *host,
const char *security, const char *access, void *cookie)
{
- pid_t pid;
- int rc, status;
+ int rc;
char *linuxhost, *hostpath;
-
- pid = fork();
-
- if (pid < 0)
- return SA_SYSTEM_ERR;
-
- if (pid > 0) {
- while ((rc = waitpid(pid, &status, 0)) <= 0 && errno == EINTR)
- ; /* empty loop body */
-
- if (rc <= 0)
- return SA_SYSTEM_ERR;
-
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
- return SA_CONFIG_ERR;
-
- return SA_OK;
- }
-
- /* child */
+ char *argv[4];
rc = get_linux_hostspec(host, &linuxhost);
fprintf(stderr, "unsharing %s\n", hostpath);
#endif
- rc = execlp("/usr/sbin/exportfs", "exportfs", "-u", \
- hostpath, NULL);
+ argv[0] = "/usr/sbin/exportfs";
+ argv[1] = "-u";
+ argv[2] = hostpath;
+ argv[3] = NULL;
- if (rc < 0) {
- free(hostpath);
- exit(1);
- }
+ rc = libzfs_run_process(argv[0], argv, 0);
- exit(0);
+ free(hostpath);
+
+ if (rc < 0)
+ return (SA_SYSTEM_ERR);
+ else
+ return (SA_OK);
}
+/*
+ * Disables NFS sharing for the specified share.
+ */
static int
nfs_disable_share(sa_share_impl_t impl_share)
{
- if (!nfs_available) {
+ if (!nfs_available()) {
/*
* The share can't possibly be active, so nothing
* needs to be done to disable it.
*/
- return SA_OK;
+ return (SA_OK);
}
- return foreach_nfs_host(impl_share, nfs_disable_share_one, NULL);
+ return (foreach_nfs_host(impl_share, nfs_disable_share_one, NULL));
}
+/*
+ * Checks whether the specified NFS share options are syntactically correct.
+ */
static int
nfs_validate_shareopts(const char *shareopts)
{
rc = get_linux_shareopts(shareopts, &linux_opts);
if (rc != SA_OK)
- return rc;
+ return (rc);
free(linux_opts);
- return SA_OK;
+ return (SA_OK);
}
+/*
+ * Checks whether a share is currently active.
+ */
static boolean_t
-is_share_active(sa_share_impl_t impl_share)
+nfs_is_share_active(sa_share_impl_t impl_share)
{
char line[512];
char *tab, *cur;
FILE *nfs_exportfs_temp_fp;
- if (nfs_exportfs_temp_fd < 0)
- return B_FALSE;
+ if (!nfs_available())
+ return (B_FALSE);
nfs_exportfs_temp_fp = fdopen(dup(nfs_exportfs_temp_fd), "r");
if (nfs_exportfs_temp_fp == NULL ||
fseek(nfs_exportfs_temp_fp, 0, SEEK_SET) < 0) {
fclose(nfs_exportfs_temp_fp);
- return B_FALSE;
+ return (B_FALSE);
}
- while (fgets(line, sizeof(line), nfs_exportfs_temp_fp) != NULL) {
+ while (fgets(line, sizeof (line), nfs_exportfs_temp_fp) != NULL) {
/*
* exportfs uses separate lines for the share path
* and the export options when the share path is longer
if (strcmp(line, impl_share->sharepath) == 0) {
fclose(nfs_exportfs_temp_fp);
- return B_TRUE;
+ return (B_TRUE);
}
}
fclose(nfs_exportfs_temp_fp);
- return B_FALSE;
+ return (B_FALSE);
}
+/*
+ * Called to update a share's options. A share's options might be out of
+ * date if the share was loaded from disk (i.e. /etc/dfs/sharetab) and the
+ * "sharenfs" dataset property has changed in the meantime. This function
+ * also takes care of re-enabling the share if necessary.
+ */
static int
nfs_update_shareopts(sa_share_impl_t impl_share, const char *resource,
const char *shareopts)
boolean_t needs_reshare = B_FALSE;
char *old_shareopts;
- FSINFO(impl_share, nfs_fstype)->active = is_share_active(impl_share);
+ FSINFO(impl_share, nfs_fstype)->active =
+ nfs_is_share_active(impl_share);
old_shareopts = FSINFO(impl_share, nfs_fstype)->shareopts;
shareopts_dup = strdup(shareopts);
if (shareopts_dup == NULL)
- return SA_NO_MEMORY;
+ return (SA_NO_MEMORY);
if (old_shareopts != NULL)
free(old_shareopts);
if (needs_reshare)
nfs_enable_share(impl_share);
- return SA_OK;
+ return (SA_OK);
}
-
+/*
+ * Clears a share's NFS options. Used by libshare to
+ * clean up shares that are about to be free()'d.
+ */
static void
nfs_clear_shareopts(sa_share_impl_t impl_share)
{
nfs_exportfs_temp_fd = mkstemp(nfs_exportfs_tempfile);
if (nfs_exportfs_temp_fd < 0)
- return SA_SYSTEM_ERR;
+ return (SA_SYSTEM_ERR);
unlink(nfs_exportfs_tempfile);
pid = fork();
- if (pid < 0)
- return SA_SYSTEM_ERR;
+ if (pid < 0) {
+ (void) close(nfs_exportfs_temp_fd);
+ nfs_exportfs_temp_fd = -1;
+ return (SA_SYSTEM_ERR);
+ }
if (pid > 0) {
- while ((rc = waitpid(pid, &status, 0)) <= 0 && errno == EINTR)
- ; /* empty loop body */
+ while ((rc = waitpid(pid, &status, 0)) <= 0 && errno == EINTR);
- if (rc <= 0)
- return SA_SYSTEM_ERR;
+ if (rc <= 0) {
+ (void) close(nfs_exportfs_temp_fd);
+ nfs_exportfs_temp_fd = -1;
+ return (SA_SYSTEM_ERR);
+ }
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
- return SA_CONFIG_ERR;
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ (void) close(nfs_exportfs_temp_fd);
+ nfs_exportfs_temp_fd = -1;
+ return (SA_CONFIG_ERR);
+ }
- return SA_OK;
+ return (SA_OK);
}
/* child */
exit(0);
}
+/*
+ * Provides a convenient wrapper for determing nfs availability
+ */
+static boolean_t
+nfs_available(void)
+{
+ if (nfs_exportfs_temp_fd == -1)
+ (void) nfs_check_exportfs();
+
+ return ((nfs_exportfs_temp_fd != -1) ? B_TRUE : B_FALSE);
+}
+
+/*
+ * Initializes the NFS functionality of libshare.
+ */
void
libshare_nfs_init(void)
{
- nfs_available = (nfs_check_exportfs() == SA_OK);
-
nfs_fstype = register_fstype("nfs", &nfs_shareops);
}
projects / mirror_zfs.git / blobdiff