*
*/
-#include <ctype.h>
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
#include <errno.h>
#include <netdb.h>
#include <time.h>
+
#include <sys/socket.h>
#include <sys/mount.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
#include "xcommon.h"
#include "mount.h"
#include "nls.h"
-#include "nfs_mount.h"
#include "mount_constants.h"
#include "stropts.h"
#include "error.h"
#include "network.h"
+#include "parse_opt.h"
+#include "version.h"
+#include "parse_dev.h"
+#include "conffile.h"
-#ifdef HAVE_RPCSVC_NFS_PROT_H
-#include <rpcsvc/nfs_prot.h>
-#else
-#include <linux/nfs.h>
-#define nfsstat nfs_stat
+#ifndef NFS_PROGRAM
+#define NFS_PROGRAM (100003)
#endif
#ifndef NFS_PORT
-#define NFS_PORT 2049
+#define NFS_PORT (2049)
#endif
#ifndef NFS_MAXHOSTNAME
#define NFS_MAXPATHNAME (1024)
#endif
+#ifndef NFS_DEF_FG_TIMEOUT_MINUTES
+#define NFS_DEF_FG_TIMEOUT_MINUTES (2u)
+#endif
+
+#ifndef NFS_DEF_BG_TIMEOUT_MINUTES
+#define NFS_DEF_BG_TIMEOUT_MINUTES (10000u)
+#endif
+
extern int nfs_mount_data_version;
extern char *progname;
extern int verbose;
+extern int sloppy;
-static int retry_opt = 10000; /* 10,000 minutes ~= 1 week */
-static int bg_opt = 0;
-static int addr_opt = 0;
-static int ca_opt = 0;
+struct nfsmount_info {
+ const char *spec, /* server:/path */
+ *node, /* mounted-on dir */
+ *type; /* "nfs" or "nfs4" */
+ char *hostname; /* server's hostname */
+ struct sockaddr_storage address; /* server's address */
+ socklen_t salen; /* size of server's address */
-static int parse_devname(const char *spec, char **hostname)
-{
- int ret = 0;
- char *dev, *pathname, *s;
+ struct mount_options *options; /* parsed mount options */
+ char **extra_opts; /* string for /etc/mtab */
- dev = xstrdup(spec);
+ unsigned long version; /* NFS version */
+ int flags, /* MS_ flags */
+ fake, /* actually do the mount? */
+ child; /* forked bg child? */
+};
- if (!(pathname = strchr(dev, ':'))) {
- nfs_error(_("%s: remote share not in 'host:dir' format"),
- progname);
- goto out;
+/*
+ * Obtain a retry timeout value based on the value of the "retry=" option.
+ *
+ * Returns a time_t timeout timestamp, in seconds.
+ */
+static time_t nfs_parse_retry_option(struct mount_options *options,
+ unsigned int timeout_minutes)
+{
+ long tmp;
+
+ switch (po_get_numeric(options, "retry", &tmp)) {
+ case PO_NOT_FOUND:
+ break;
+ case PO_FOUND:
+ if (tmp >= 0) {
+ timeout_minutes = tmp;
+ break;
+ }
+ case PO_BAD_VALUE:
+ if (verbose)
+ nfs_error(_("%s: invalid retry timeout was specified; "
+ "using default timeout"), progname);
+ break;
}
- *pathname = '\0';
- pathname++;
- /*
- * We don't need a copy of the pathname, but let's
- * sanity check it anyway.
- */
- if (strlen(pathname) > NFS_MAXPATHNAME) {
- nfs_error(_("%s: export pathname is too long"),
- progname);
- goto out;
- }
+ return time(NULL) + (time_t)(timeout_minutes * 60);
+}
- /*
- * Ignore all but first hostname in replicated mounts
- * until they can be fully supported. (mack@sgi.com)
- */
- if ((s = strchr(dev, ','))) {
- *s = '\0';
- nfs_error(_("%s: warning: multiple hostnames not supported"),
- progname);
- nfs_error(_("%s: ignoring hostnames that follow the first one"),
- progname);
- }
- *hostname = xstrdup(dev);
- if (strlen(*hostname) > NFS_MAXHOSTNAME) {
- nfs_error(_("%s: server hostname is too long"),
- progname);
- free(*hostname);
- goto out;
- }
+/*
+ * Convert the passed-in sockaddr-style address to presentation
+ * format, then append an option of the form "keyword=address".
+ *
+ * Returns 1 if the option was appended successfully; otherwise zero.
+ */
+static int nfs_append_generic_address_option(const struct sockaddr *sap,
+ const socklen_t salen,
+ const char *keyword,
+ struct mount_options *options)
+{
+ char address[NI_MAXHOST];
+ char new_option[512];
+ int len;
- ret = 1;
+ if (!nfs_present_sockaddr(sap, salen, address, sizeof(address)))
+ goto out_err;
-out:
- free(dev);
- return ret;
+ len = snprintf(new_option, sizeof(new_option), "%s=%s",
+ keyword, address);
+ if (len < 0 || (size_t)len >= sizeof(new_option))
+ goto out_err;
+
+ if (po_append(options, new_option) != PO_SUCCEEDED)
+ goto out_err;
+
+ return 1;
+
+out_err:
+ nfs_error(_("%s: failed to construct %s option"), progname, keyword);
+ return 0;
+}
+
+/*
+ * Append the 'addr=' option to the options string to pass a resolved
+ * server address to the kernel. After a successful mount, this address
+ * is also added to /etc/mtab for use when unmounting.
+ *
+ * If 'addr=' is already present, we strip it out. This prevents users
+ * from setting a bogus 'addr=' option themselves, and also allows bg
+ * retries to recompute the server's address, in case it has changed.
+ *
+ * Returns 1 if 'addr=' option appended successfully;
+ * otherwise zero.
+ */
+static int nfs_append_addr_option(const struct sockaddr *sap,
+ socklen_t salen,
+ struct mount_options *options)
+{
+ po_remove_all(options, "addr");
+ return nfs_append_generic_address_option(sap, salen, "addr", options);
}
-static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
+/*
+ * Called to discover our address and append an appropriate 'clientaddr='
+ * option to the options string.
+ *
+ * Returns 1 if 'clientaddr=' option created successfully or if
+ * 'clientaddr=' option is already present; otherwise zero.
+ */
+static int nfs_append_clientaddr_option(const struct sockaddr *sap,
+ socklen_t salen,
+ struct mount_options *options)
{
- struct hostent *hp;
- addr->sin_family = AF_INET;
+ struct sockaddr_storage dummy;
+ struct sockaddr *my_addr = (struct sockaddr *)&dummy;
+ socklen_t my_len = sizeof(dummy);
- if (inet_aton(hostname, &addr->sin_addr))
+ if (po_contains(options, "clientaddr") == PO_FOUND)
return 1;
- if ((hp = gethostbyname(hostname)) == NULL) {
- nfs_error(_("%s: can't get address for %s\n"),
- progname, hostname);
+
+ nfs_callback_address(sap, salen, my_addr, &my_len);
+
+ return nfs_append_generic_address_option(my_addr, my_len,
+ "clientaddr", options);
+}
+
+/*
+ * Resolve the 'mounthost=' hostname and append a new option using
+ * the resulting address.
+ */
+static int nfs_fix_mounthost_option(struct mount_options *options)
+{
+ struct sockaddr_storage dummy;
+ struct sockaddr *sap = (struct sockaddr *)&dummy;
+ socklen_t salen = sizeof(dummy);
+ char *mounthost;
+
+ mounthost = po_get(options, "mounthost");
+ if (!mounthost)
+ return 1;
+
+ if (!nfs_name_to_address(mounthost, sap, &salen)) {
+ nfs_error(_("%s: unable to determine mount server's address"),
+ progname);
return 0;
}
- if (hp->h_length > sizeof(struct in_addr)) {
- nfs_error(_("%s: got bad hp->h_length"), progname);
- hp->h_length = sizeof(struct in_addr);
+
+ return nfs_append_generic_address_option(sap, salen,
+ "mountaddr", options);
+}
+
+/*
+ * Returns zero if the "lock" option is in effect, but statd
+ * can't be started. Otherwise, returns 1.
+ */
+static const char *nfs_lock_opttbl[] = {
+ "nolock",
+ "lock",
+ NULL,
+};
+
+static int nfs_verify_lock_option(struct mount_options *options)
+{
+ if (po_rightmost(options, nfs_lock_opttbl) == 0)
+ return 1;
+
+ if (!start_statd()) {
+ nfs_error(_("%s: rpc.statd is not running but is "
+ "required for remote locking."), progname);
+ nfs_error(_("%s: Either use '-o nolock' to keep "
+ "locks local, or start statd."), progname);
+ return 0;
}
- memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
+
+ return 1;
+}
+
+static int nfs_append_sloppy_option(struct mount_options *options)
+{
+ if (!sloppy || linux_version_code() < MAKE_VERSION(2, 6, 27))
+ return 1;
+
+ if (po_append(options, "sloppy") == PO_FAILED)
+ return 0;
return 1;
}
/*
- * XXX: This should really use the technique neil recently added
- * to get the address off the local end of a socket connected to
- * the server -- to get the right address to use on multi-homed
- * clients
+ * Set up mandatory non-version specific NFS mount options.
+ *
+ * Returns 1 if successful; otherwise zero.
*/
-static int get_my_ipv4addr(char *ip_addr, int len)
+static int nfs_validate_options(struct nfsmount_info *mi)
{
- char myname[1024];
- struct sockaddr_in myaddr;
+ struct sockaddr *sap = (struct sockaddr *)&mi->address;
- if (gethostname(myname, sizeof(myname))) {
- nfs_error(_("%s: can't determine client address\n"),
- progname);
+ if (!nfs_parse_devname(mi->spec, &mi->hostname, NULL))
+ return 0;
+
+ mi->salen = sizeof(mi->address);
+ if (!nfs_name_to_address(mi->hostname, sap, &mi->salen))
return 0;
+
+ if (!nfs_nfs_version(mi->options, &mi->version))
+ return 0;
+ if (strncmp(mi->type, "nfs4", 4) == 0)
+ mi->version = 4;
+ else {
+ char *option = po_get(mi->options, "proto");
+ if (option && strcmp(option, "rdma") == 0)
+ mi->version = 3;
}
- if (!fill_ipv4_sockaddr(myname, &myaddr))
+ /*
+ * Use the default value set in the config file when
+ * the version has not been explicitly set.
+ */
+ if (mi->version == 0 && config_default_vers) {
+ if (config_default_vers < 4)
+ mi->version = config_default_vers;
+ }
+
+ if (!nfs_append_sloppy_option(mi->options))
return 0;
- snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
- ip_addr[len - 1] = '\0';
+ if (!nfs_append_addr_option(sap, mi->salen, mi->options))
+ return 0;
return 1;
}
/*
- * Walk through our mount options string, and indicate the presence
- * of 'bg', 'retry=', 'addr=', and 'clientaddr='.
+ * Get NFS/mnt server addresses from mount options
+ *
+ * Returns 1 and fills in @nfs_saddr, @nfs_salen, @mnt_saddr, and @mnt_salen
+ * if all goes well; otherwise zero.
*/
-static void extract_interesting_options(char *opts)
+static int nfs_extract_server_addresses(struct mount_options *options,
+ struct sockaddr *nfs_saddr,
+ socklen_t *nfs_salen,
+ struct sockaddr *mnt_saddr,
+ socklen_t *mnt_salen)
{
- char *opt, *opteq;
- int val;
-
- opts = xstrdup(opts);
-
- for (opt = strtok(opts, ","); opt; opt = strtok(NULL, ",")) {
- if ((opteq = strchr(opt, '='))) {
- val = atoi(opteq + 1);
- *opteq = '\0';
- if (strcmp(opt, "bg") == 0)
- bg_opt++;
- else if (strcmp(opt, "retry") == 0)
- retry_opt = val;
- else if (strcmp(opt, "addr") == 0)
- addr_opt++;
- else if (strcmp(opt, "clientaddr") == 0)
- ca_opt++;
- } else {
- if (strcmp(opt, "bg") == 0)
- bg_opt++;
- }
+ char *option;
+
+ option = po_get(options, "addr");
+ if (option == NULL)
+ return 0;
+ if (!nfs_string_to_sockaddr(option, nfs_saddr, nfs_salen))
+ return 0;
+
+ option = po_get(options, "mountaddr");
+ if (option == NULL) {
+ memcpy(mnt_saddr, nfs_saddr, *nfs_salen);
+ *mnt_salen = *nfs_salen;
+ } else if (!nfs_string_to_sockaddr(option, mnt_saddr, mnt_salen))
+ return 0;
+
+ return 1;
+}
+
+static int nfs_construct_new_options(struct mount_options *options,
+ struct pmap *nfs_pmap,
+ struct pmap *mnt_pmap)
+{
+ char new_option[64];
+
+ po_remove_all(options, "nfsprog");
+ po_remove_all(options, "mountprog");
+
+ po_remove_all(options, "v2");
+ po_remove_all(options, "v3");
+ po_remove_all(options, "vers");
+ po_remove_all(options, "nfsvers");
+ snprintf(new_option, sizeof(new_option) - 1,
+ "vers=%lu", nfs_pmap->pm_vers);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+
+ po_remove_all(options, "proto");
+ po_remove_all(options, "udp");
+ po_remove_all(options, "tcp");
+ switch (nfs_pmap->pm_prot) {
+ case IPPROTO_TCP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "proto=tcp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ case IPPROTO_UDP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "proto=udp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ }
+
+ po_remove_all(options, "port");
+ if (nfs_pmap->pm_port != NFS_PORT) {
+ snprintf(new_option, sizeof(new_option) - 1,
+ "port=%lu", nfs_pmap->pm_port);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ }
+
+ po_remove_all(options, "mountvers");
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountvers=%lu", mnt_pmap->pm_vers);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+
+ po_remove_all(options, "mountproto");
+ switch (mnt_pmap->pm_prot) {
+ case IPPROTO_TCP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountproto=tcp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ case IPPROTO_UDP:
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountproto=udp");
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
}
- free(opts);
+ po_remove_all(options, "mountport");
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountport=%lu", mnt_pmap->pm_port);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+
+ return 1;
}
/*
- * Append the 'addr=' option to the options string. The server
- * address is added to /etc/mtab for use when unmounting.
+ * Reconstruct the mount option string based on a portmapper probe
+ * of the server. Returns one if the server's portmapper returned
+ * something we can use, otherwise zero.
*
- * Returns 1 if 'addr=' option created successfully;
- * otherwise zero.
+ * To handle version and transport protocol fallback properly, we
+ * need to parse some of the mount options in order to set up a
+ * portmap probe. Mount options that nfs_rewrite_pmap_mount_options()
+ * doesn't recognize are left alone.
+ *
+ * Returns TRUE if rewriting was successful; otherwise
+ * FALSE is returned if some failure occurred.
*/
-static int append_addr_opt(struct sockaddr_in *saddr, char **extra_opts)
+static int
+nfs_rewrite_pmap_mount_options(struct mount_options *options)
{
- static char new_opts[1024];
- char *s, *old_opts;
-
- s = inet_ntoa(saddr->sin_addr);
- old_opts = *extra_opts;
- if (!old_opts)
- old_opts = "";
- if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
- nfs_error(_("%s: too many mount options\n"),
- progname);
+ struct sockaddr_storage nfs_address;
+ struct sockaddr *nfs_saddr = (struct sockaddr *)&nfs_address;
+ socklen_t nfs_salen = sizeof(nfs_address);
+ struct pmap nfs_pmap;
+ struct sockaddr_storage mnt_address;
+ struct sockaddr *mnt_saddr = (struct sockaddr *)&mnt_address;
+ socklen_t mnt_salen = sizeof(mnt_address);
+ struct pmap mnt_pmap;
+ char *option;
+
+ /*
+ * Skip option negotiation for proto=rdma mounts.
+ */
+ option = po_get(options, "proto");
+ if (option && strcmp(option, "rdma") == 0)
+ goto out;
+
+ /*
+ * Extract just the options needed to contact server.
+ * Bail now if any of these have bad values.
+ */
+ if (!nfs_extract_server_addresses(options, nfs_saddr, &nfs_salen,
+ mnt_saddr, &mnt_salen)) {
+ errno = EINVAL;
+ return 0;
+ }
+ if (!nfs_options2pmap(options, &nfs_pmap, &mnt_pmap)) {
+ errno = EINVAL;
+ return 0;
+ }
+
+ /*
+ * The kernel NFS client doesn't support changing the RPC
+ * program number for these services, so force the value of
+ * these fields before probing the server's ports.
+ */
+ nfs_pmap.pm_prog = NFS_PROGRAM;
+ mnt_pmap.pm_prog = MOUNTPROG;
+
+ /*
+ * If the server's rpcbind service isn't available, we can't
+ * negotiate. Bail now if we can't contact it.
+ */
+ if (!nfs_probe_bothports(mnt_saddr, mnt_salen, &mnt_pmap,
+ nfs_saddr, nfs_salen, &nfs_pmap)) {
+ errno = ESPIPE;
+ return 0;
+ }
+
+ if (!nfs_construct_new_options(options, &nfs_pmap, &mnt_pmap)) {
+ errno = EINVAL;
return 0;
}
- snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
- old_opts, *old_opts ? "," : "", s);
- *extra_opts = xstrdup(new_opts);
+out:
+ errno = 0;
return 1;
}
/*
- * Append the 'clientaddr=' option to the options string.
+ * Do the mount(2) system call.
*
- * Returns 1 if 'clientaddr=' option created successfully;
- * otherwise zero.
+ * Returns TRUE if successful, otherwise FALSE.
+ * "errno" is set to reflect the individual error.
*/
-static int append_clientaddr_opt(struct sockaddr_in *saddr, char **extra_opts)
+static int nfs_sys_mount(struct nfsmount_info *mi, struct mount_options *opts)
{
- static char new_opts[2048], cbuf[256];
- struct sockaddr_in my_addr;
+ char *options = NULL;
+ int result;
- if (!get_client_address(saddr, &my_addr))
+ if (po_join(opts, &options) == PO_FAILED) {
+ errno = EIO;
return 0;
+ }
- if (strlen(*extra_opts) + 30 >= sizeof(new_opts)) {
- nfs_error(_("%s: too many mount options"),
- progname);
- return 0;
+ if (verbose)
+ printf(_("%s: trying text-based options '%s'\n"),
+ progname, options);
+
+ if (mi->fake)
+ return 1;
+
+ result = mount(mi->spec, mi->node, mi->type,
+ mi->flags & ~(MS_USER|MS_USERS), options);
+ if (verbose && result) {
+ int save = errno;
+ nfs_error(_("%s: mount(2): %s"), progname, strerror(save));
+ errno = save;
+ }
+ return !result;
+}
+
+/*
+ * For "-t nfs vers=2" or "-t nfs vers=3" mounts.
+ */
+static int nfs_try_mount_v3v2(struct nfsmount_info *mi)
+{
+ struct mount_options *options = po_dup(mi->options);
+ int result = 0;
+
+ if (!options) {
+ errno = ENOMEM;
+ return result;
}
- strcat(new_opts, *extra_opts);
+ if (!nfs_fix_mounthost_option(options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ if (!mi->fake && !nfs_verify_lock_option(options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
- snprintf(cbuf, sizeof(cbuf) - 1, "%sclientaddr=%s",
- *extra_opts ? "," : "", inet_ntoa(my_addr.sin_addr));
+ /*
+ * Options we negotiate below may be stale by the time this
+ * file system is unmounted. In order to force umount.nfs
+ * to renegotiate with the server, only write the user-
+ * specified options, and not negotiated options, to /etc/mtab.
+ */
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ goto out_fail;
+ }
- strcat(new_opts, cbuf);
+ if (!nfs_rewrite_pmap_mount_options(options))
+ goto out_fail;
- *extra_opts = xstrdup(new_opts);
+ result = nfs_sys_mount(mi, options);
- return 1;
+out_fail:
+ po_destroy(options);
+ return result;
}
/*
- * nfsmount_s - Mount an NFSv2 or v3 file system using C string options
- *
- * @spec: C string hostname:path specifying remoteshare to mount
- * @node: C string pathname of local mounted on directory
- * @flags: MS_ style flags
- * @extra_opts: pointer to C string containing fs-specific mount options
- * (possibly also a return argument)
- * @fake: flag indicating whether to carry out the whole operation
- * @bg: one if this is a backgrounded mount attempt
- *
- * XXX: need to handle bg, fg, and retry options.
+ * For "-t nfs -o vers=4" or "-t nfs4" mounts.
*/
-int nfsmount_s(const char *spec, const char *node, int flags,
- char **extra_opts, int fake, int bg)
+static int nfs_try_mount_v4(struct nfsmount_info *mi)
{
- struct sockaddr_in saddr;
- char *hostname;
- int err;
+ struct sockaddr *sap = (struct sockaddr *)&mi->address;
+ struct mount_options *options = po_dup(mi->options);
+ int result = 0;
- if (!parse_devname(spec, &hostname))
- return EX_FAIL;
- err = fill_ipv4_sockaddr(hostname, &saddr);
- free(hostname);
- if (!err)
- return EX_FAIL;
+ if (!options) {
+ errno = ENOMEM;
+ return result;
+ }
- extract_interesting_options(*extra_opts);
+ if (mi->version == 0) {
+ if (po_append(options, "vers=4") == PO_FAILED) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ }
- if (!bg && addr_opt) {
- nfs_error(_("%s: Illegal option: 'addr='"), progname);
- return EX_FAIL;
+ if (!nfs_append_clientaddr_option(sap, mi->salen, options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ /*
+ * Update option string to be recorded in /etc/mtab.
+ */
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ return 0;
}
- if (!append_addr_opt(&saddr, extra_opts))
- return EX_FAIL;
+ result = nfs_sys_mount(mi, options);
- if (verbose)
- printf(_("%s: text-based options: '%s'\n"),
- progname, *extra_opts);
-
- if (!fake) {
- if (mount(spec, node, "nfs",
- flags & ~(MS_USER|MS_USERS), *extra_opts)) {
- mount_error(spec, node, errno);
- return EX_FAIL;
+out_fail:
+ po_destroy(options);
+ return result;
+}
+
+/*
+ * This is a single pass through the fg/bg loop.
+ *
+ * Returns TRUE if successful, otherwise FALSE.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_try_mount(struct nfsmount_info *mi)
+{
+ int result = 0;
+
+ switch (mi->version) {
+ case 0:
+ if (linux_version_code() > MAKE_VERSION(2, 6, 31)) {
+ errno = 0;
+ result = nfs_try_mount_v4(mi);
+ if (errno != EPROTONOSUPPORT)
+ break;
}
+ case 2:
+ case 3:
+ result = nfs_try_mount_v3v2(mi);
+ break;
+ case 4:
+ result = nfs_try_mount_v4(mi);
+ break;
+ default:
+ errno = EIO;
}
- return 0;
+ return result;
}
/*
- * nfs4mount_s - Mount an NFSv4 file system using C string options
+ * Distinguish between permanent and temporary errors.
*
- * @spec: C string hostname:path specifying remoteshare to mount
- * @node: C string pathname of local mounted on directory
- * @flags: MS_ style flags
- * @extra_opts: pointer to C string containing fs-specific mount options
- * (possibly also a return argument)
- * @fake: flag indicating whether to carry out the whole operation
- * @child: one if this is a backgrounded mount
+ * Basically, we retry if communication with the server has
+ * failed so far, but fail immediately if there is a local
+ * error (like a bad mount option).
*
- * XXX: need to handle bg, fg, and retry options.
+ * ESTALE is also a temporary error because some servers
+ * return ESTALE when a share is temporarily offline.
*
+ * Returns 1 if we should fail immediately, or 0 if we
+ * should retry.
*/
-int nfs4mount_s(const char *spec, const char *node, int flags,
- char **extra_opts, int fake, int child)
+static int nfs_is_permanent_error(int error)
{
- struct sockaddr_in saddr;
- char *hostname;
- int err;
+ switch (error) {
+ case ESTALE:
+ case ETIMEDOUT:
+ case ECONNREFUSED:
+ return 0; /* temporary */
+ default:
+ return 1; /* permanent */
+ }
+}
- if (!parse_devname(spec, &hostname))
- return EX_FAIL;
- err = fill_ipv4_sockaddr(hostname, &saddr);
- free(hostname);
- if (!err)
- return EX_FAIL;
+/*
+ * Handle "foreground" NFS mounts.
+ *
+ * Retry the mount request for as long as the 'retry=' option says.
+ *
+ * Returns a valid mount command exit code.
+ */
+static int nfsmount_fg(struct nfsmount_info *mi)
+{
+ unsigned int secs = 1;
+ time_t timeout;
- extract_interesting_options(*extra_opts);
+ timeout = nfs_parse_retry_option(mi->options,
+ NFS_DEF_FG_TIMEOUT_MINUTES);
+ if (verbose)
+ printf(_("%s: timeout set for %s"),
+ progname, ctime(&timeout));
- if (addr_opt) {
- nfs_error(_("%s: Illegal option: 'addr='"), progname);
- return EX_FAIL;
- }
+ for (;;) {
+ if (nfs_try_mount(mi))
+ return EX_SUCCESS;
+
+ if (nfs_is_permanent_error(errno))
+ break;
+
+ if (time(NULL) > timeout) {
+ errno = ETIMEDOUT;
+ break;
+ }
+
+ if (errno != ETIMEDOUT) {
+ if (sleep(secs))
+ break;
+ secs <<= 1;
+ if (secs > 10)
+ secs = 10;
+ }
+ };
+
+ mount_error(mi->spec, mi->node, errno);
+ return EX_FAIL;
+}
- if (ca_opt) {
- nfs_error(_("%s: Illegal option: 'clientaddr='"), progname);
+/*
+ * Handle "background" NFS mount [first try]
+ *
+ * Returns a valid mount command exit code.
+ *
+ * EX_BG should cause the caller to fork and invoke nfsmount_child.
+ */
+static int nfsmount_parent(struct nfsmount_info *mi)
+{
+ if (nfs_try_mount(mi))
+ return EX_SUCCESS;
+
+ if (nfs_is_permanent_error(errno)) {
+ mount_error(mi->spec, mi->node, errno);
return EX_FAIL;
}
- if (!append_addr_opt(&saddr, extra_opts))
- return EX_FAIL;
+ sys_mount_errors(mi->hostname, errno, 1, 1);
+ return EX_BG;
+}
+
+/*
+ * Handle "background" NFS mount [retry daemon]
+ *
+ * Returns a valid mount command exit code: EX_SUCCESS if successful,
+ * EX_FAIL if a failure occurred. There's nothing to catch the
+ * error return, though, so we use sys_mount_errors to log the
+ * failure.
+ */
+static int nfsmount_child(struct nfsmount_info *mi)
+{
+ unsigned int secs = 1;
+ time_t timeout;
+
+ timeout = nfs_parse_retry_option(mi->options,
+ NFS_DEF_BG_TIMEOUT_MINUTES);
+
+ for (;;) {
+ if (sleep(secs))
+ break;
+ secs <<= 1;
+ if (secs > 120)
+ secs = 120;
+
+ if (nfs_try_mount(mi))
+ return EX_SUCCESS;
+
+ if (nfs_is_permanent_error(errno))
+ break;
+
+ if (time(NULL) > timeout)
+ break;
+
+ sys_mount_errors(mi->hostname, errno, 1, 1);
+ };
+
+ sys_mount_errors(mi->hostname, errno, 1, 0);
+ return EX_FAIL;
+}
+
+/*
+ * Handle "background" NFS mount
+ *
+ * Returns a valid mount command exit code.
+ */
+static int nfsmount_bg(struct nfsmount_info *mi)
+{
+ if (!mi->child)
+ return nfsmount_parent(mi);
+ else
+ return nfsmount_child(mi);
+}
+
+/*
+ * Process mount options and try a mount system call.
+ *
+ * Returns a valid mount command exit code.
+ */
+static const char *nfs_background_opttbl[] = {
+ "bg",
+ "fg",
+ NULL,
+};
- if (!append_clientaddr_opt(&saddr, extra_opts))
+static int nfsmount_start(struct nfsmount_info *mi)
+{
+ if (!nfs_validate_options(mi))
return EX_FAIL;
- if (verbose)
- printf(_("%s: text-based options: '%s'\n"),
- progname, *extra_opts);
-
- if (!fake) {
- if (mount(spec, node, "nfs4",
- flags & ~(MS_USER|MS_USERS), *extra_opts)) {
- mount_error(spec, node, errno);
- return EX_FAIL;
- }
- }
+ if (po_rightmost(mi->options, nfs_background_opttbl) == 0)
+ return nfsmount_bg(mi);
+ else
+ return nfsmount_fg(mi);
+}
- return 0;
+/**
+ * nfsmount_string - Mount an NFS file system using C string options
+ * @spec: C string specifying remote share to mount ("hostname:path")
+ * @node: C string pathname of local mounted-on directory
+ * @type: C string that represents file system type ("nfs" or "nfs4")
+ * @flags: MS_ style mount flags
+ * @extra_opts: pointer to C string containing fs-specific mount options
+ * (input and output argument)
+ * @fake: flag indicating whether to carry out the whole operation
+ * @child: one if this is a mount daemon (bg)
+ */
+int nfsmount_string(const char *spec, const char *node, const char *type,
+ int flags, char **extra_opts, int fake, int child)
+{
+ struct nfsmount_info mi = {
+ .spec = spec,
+ .node = node,
+ .type = type,
+ .extra_opts = extra_opts,
+ .flags = flags,
+ .fake = fake,
+ .child = child,
+ };
+ int retval = EX_FAIL;
+
+ mi.options = po_split(*extra_opts);
+ if (mi.options) {
+ retval = nfsmount_start(&mi);
+ po_destroy(mi.options);
+ } else
+ nfs_error(_("%s: internal option parsing error"), progname);
+
+ free(mi.hostname);
+ return retval;
}
projects / nfs-utils.git / blobdiff