*
*/
-#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 parse_devname(const char *spec, char **hostname)
-{
- int ret = 0;
- char *dev, *pathname, *s;
+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 */
- dev = xstrdup(spec);
+ struct mount_options *options; /* parsed mount options */
+ char **extra_opts; /* string for /etc/mtab */
- if (!(pathname = strchr(dev, ':'))) {
- nfs_error(_("%s: remote share not in 'host:dir' format"),
- progname);
- goto out;
- }
- *pathname = '\0';
- pathname++;
+ unsigned long version; /* NFS version */
+ int flags, /* MS_ flags */
+ fake, /* actually do the mount? */
+ child; /* forked bg child? */
+};
- /*
- * 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;
- }
+#ifdef MOUNT_CONFIG
+static void nfs_default_version(struct nfsmount_info *mi);
+static void nfs_default_version(struct nfsmount_info *mi)
+{
+ extern unsigned long config_default_vers;
/*
- * Ignore all but first hostname in replicated mounts
- * until they can be fully supported. (mack@sgi.com)
+ * Use the default value set in the config file when
+ * the version has not been explicitly set.
*/
- 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;
+ if (mi->version == 0 && config_default_vers) {
+ if (config_default_vers < 4)
+ mi->version = config_default_vers;
}
+}
+#else
+inline void nfs_default_version(struct nfsmount_info *mi) {}
+#endif /* MOUNT_CONFIG */
- ret = 1;
+/*
+ * 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;
-out:
- free(dev);
- return ret;
+ 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;
+ }
+
+ return time(NULL) + (time_t)(timeout_minutes * 60);
}
-static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
+/*
+ * 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)
{
- struct hostent *hp;
- addr->sin_family = AF_INET;
+ char address[NI_MAXHOST];
+ char new_option[512];
+ int len;
+
+ if (!nfs_present_sockaddr(sap, salen, address, sizeof(address)))
+ goto out_err;
+
+ 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;
- if (inet_aton(hostname, &addr->sin_addr))
- return 1;
- if ((hp = gethostbyname(hostname)) == NULL) {
- nfs_error(_("%s: can't get address for %s\n"),
- progname, hostname);
- 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);
- }
- memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
return 1;
+
+out_err:
+ nfs_error(_("%s: failed to construct %s option"), progname, keyword);
+ return 0;
}
/*
* Returns 1 if 'addr=' option appended successfully;
* otherwise zero.
*/
-static int append_addr_option(struct sockaddr_in *saddr,
- struct mount_options *options)
+static int nfs_append_addr_option(const struct sockaddr *sap,
+ socklen_t salen,
+ struct mount_options *options)
{
- char new_option[24];
-
po_remove_all(options, "addr");
-
- snprintf(new_option, sizeof(new_option) - 1,
- "addr=%s", inet_ntoa(saddr->sin_addr));
-
- if (po_append(options, new_option) == PO_SUCCEEDED)
- return 1;
- return 0;
+ return nfs_append_generic_address_option(sap, salen, "addr", options);
}
/*
* Returns 1 if 'clientaddr=' option created successfully or if
* 'clientaddr=' option is already present; otherwise zero.
*/
-static int append_clientaddr_option(struct sockaddr_in *saddr,
- struct mount_options *options)
+static int nfs_append_clientaddr_option(const struct sockaddr *sap,
+ socklen_t salen,
+ struct mount_options *options)
{
- struct sockaddr_in my_addr;
- char new_option[32];
+ struct sockaddr_storage dummy;
+ struct sockaddr *my_addr = (struct sockaddr *)&dummy;
+ socklen_t my_len = sizeof(dummy);
- if (po_contains(options, "clientaddr") == PO_SUCCEEDED)
+ if (po_contains(options, "clientaddr") == PO_FOUND)
return 1;
- if (!get_client_address(saddr, &my_addr))
- return 0;
-
- snprintf(new_option, sizeof(new_option) - 1,
- "clientaddr=%s", inet_ntoa(my_addr.sin_addr));
+ nfs_callback_address(sap, salen, my_addr, &my_len);
- if (po_append(options, new_option) == PO_SUCCEEDED)
- return 1;
- return 0;
+ return nfs_append_generic_address_option(my_addr, my_len,
+ "clientaddr", options);
}
/*
* Resolve the 'mounthost=' hostname and append a new option using
- * the resulting IPv4 address.
+ * the resulting address.
*/
-static int fix_mounthost_option(struct mount_options *options)
+static int nfs_fix_mounthost_option(struct mount_options *options)
{
- struct sockaddr_in maddr;
- char *mounthost, new_option[32];
+ 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 (!fill_ipv4_sockaddr(mounthost, &maddr))
+ if (!nfs_name_to_address(mounthost, sap, &salen)) {
+ nfs_error(_("%s: unable to determine mount server's address"),
+ progname);
+ return 0;
+ }
+
+ 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;
+ }
- snprintf(new_option, sizeof(new_option) - 1,
- "mountaddr=%s", inet_ntoa(maddr.sin_addr));
+ return 1;
+}
- if (po_append(options, new_option) == PO_SUCCEEDED)
+static int nfs_append_sloppy_option(struct mount_options *options)
+{
+ if (!sloppy || linux_version_code() < MAKE_VERSION(2, 6, 27))
return 1;
- return 0;
+
+ if (po_append(options, "sloppy") == PO_FAILED)
+ return 0;
+ return 1;
+}
+
+static int nfs_set_version(struct nfsmount_info *mi)
+{
+ 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 we still don't know, check for version-specific
+ * mount options.
+ */
+ if (mi->version == 0) {
+ if (po_contains(mi->options, "mounthost") ||
+ po_contains(mi->options, "mountaddr") ||
+ po_contains(mi->options, "mountvers") ||
+ po_contains(mi->options, "mountproto"))
+ mi->version = 3;
+ }
+
+ /*
+ * If enabled, see if the default version was
+ * set in the config file
+ */
+ nfs_default_version(mi);
+
+ return 1;
}
/*
- * Set up mandatory mount options.
+ * Set up mandatory non-version specific NFS mount options.
*
* Returns 1 if successful; otherwise zero.
*/
-static int set_mandatory_options(const char *type,
- struct sockaddr_in *saddr,
- struct mount_options *options)
+static int nfs_validate_options(struct nfsmount_info *mi)
{
- if (!append_addr_option(saddr, options))
+ struct sockaddr *sap = (struct sockaddr *)&mi->address;
+
+ if (!nfs_parse_devname(mi->spec, &mi->hostname, NULL))
return 0;
- if (strncmp(type, "nfs4", 4) == 0) {
- if (!append_clientaddr_option(saddr, options))
- return 0;
- } else {
- if (!fix_mounthost_option(options))
- return 0;
- }
+ mi->salen = sizeof(mi->address);
+ if (!nfs_name_to_address(mi->hostname, sap, &mi->salen))
+ return 0;
+
+ if (!nfs_set_version(mi))
+ return 0;
+
+ if (!nfs_append_sloppy_option(mi->options))
+ return 0;
+
+ if (!nfs_append_addr_option(sap, mi->salen, mi->options))
+ return 0;
return 1;
}
/*
- * 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.
- *
- * 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 rewrite_mount_options()
- * doesn't recognize are left alone.
+ * Get NFS/mnt server addresses from mount options
*
- * Returns a new group of mount options if successful; otherwise
- * NULL is returned if some failure occurred.
+ * Returns 1 and fills in @nfs_saddr, @nfs_salen, @mnt_saddr, and @mnt_salen
+ * if all goes well; otherwise zero.
*/
-static struct mount_options *rewrite_mount_options(char *str)
+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)
{
- struct mount_options *options;
- char *option, new_option[64];
- clnt_addr_t mnt_server = { };
- clnt_addr_t nfs_server = { };
- int p;
-
- options = po_split(str);
- if (!options)
- return NULL;
+ char *option;
option = po_get(options, "addr");
- if (option) {
- nfs_server.saddr.sin_family = AF_INET;
- if (!inet_aton((const char *)option, &nfs_server.saddr.sin_addr))
- goto err;
- } else
- goto err;
+ if (option == NULL)
+ return 0;
+ if (!nfs_string_to_sockaddr(option, nfs_saddr, nfs_salen))
+ return 0;
option = po_get(options, "mountaddr");
- if (option) {
- mnt_server.saddr.sin_family = AF_INET;
- if (!inet_aton((const char *)option, &mnt_server.saddr.sin_addr))
- goto err;
- } else
- memcpy(&mnt_server.saddr, &nfs_server.saddr,
- sizeof(mnt_server.saddr));
-
- option = po_get(options, "mountport");
- if (option)
- mnt_server.pmap.pm_port = atoi(option);
- mnt_server.pmap.pm_prog = MOUNTPROG;
- option = po_get(options, "mountprog");
- if (option)
- mnt_server.pmap.pm_prog = atoi(option);
- option = po_get(options, "mountvers");
- if (option)
- mnt_server.pmap.pm_vers = atoi(option);
-
- option = po_get(options, "port");
- if (option) {
- nfs_server.pmap.pm_port = atoi(option);
- po_remove_all(options, "port");
- }
- nfs_server.pmap.pm_prog = NFS_PROGRAM;
- option = po_get(options, "nfsprog");
- if (option)
- nfs_server.pmap.pm_prog = atoi(option);
-
- option = po_get(options, "nfsvers");
- if (option) {
- nfs_server.pmap.pm_vers = atoi(option);
- po_remove_all(options, "nfsvers");
- }
- option = po_get(options, "vers");
- if (option) {
- nfs_server.pmap.pm_vers = atoi(option);
- po_remove_all(options, "vers");
- }
- option = po_get(options, "proto");
- if (option) {
- if (strcmp(option, "tcp") == 0) {
- nfs_server.pmap.pm_prot = IPPROTO_TCP;
- po_remove_all(options, "proto");
- }
- if (strcmp(option, "udp") == 0) {
- nfs_server.pmap.pm_prot = IPPROTO_UDP;
- po_remove_all(options, "proto");
- }
- }
- p = po_rightmost(options, "tcp", "udp");
- switch (p) {
- case PO_KEY2_RIGHTMOST:
- nfs_server.pmap.pm_prot = IPPROTO_UDP;
- break;
- case PO_KEY1_RIGHTMOST:
- nfs_server.pmap.pm_prot = IPPROTO_TCP;
- break;
- }
- po_remove_all(options, "tcp");
- po_remove_all(options, "udp");
+ 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;
- if (!probe_bothports(&mnt_server, &nfs_server)) {
- rpc_mount_errors("rpcbind", 0, 0);
- goto err;
- }
+ 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,
- "nfsvers=%lu", nfs_server.pmap.pm_vers);
+ "vers=%lu", nfs_pmap->pm_vers);
if (po_append(options, new_option) == PO_FAILED)
- goto err;
+ return 0;
- if (nfs_server.pmap.pm_prot == IPPROTO_TCP)
+ 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");
- else
+ 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)
- goto err;
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
+ break;
+ }
- if (nfs_server.pmap.pm_port != NFS_PORT) {
+ po_remove_all(options, "port");
+ if (nfs_pmap->pm_port != NFS_PORT) {
snprintf(new_option, sizeof(new_option) - 1,
- "port=%lu", nfs_server.pmap.pm_port);
+ "port=%lu", nfs_pmap->pm_port);
if (po_append(options, new_option) == PO_FAILED)
- goto err;
+ 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;
}
- return options;
+ 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;
-err:
- po_destroy(options);
- return NULL;
+ return 1;
}
/*
- * Retry an NFS mount that failed because the requested service isn't
- * available on the server.
+ * 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 successful. Otherwise, returns zero.
- * "errno" is set to reflect the individual error.
+ * 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.
*
- * Side effect: If the retry is successful, both 'options' and
- * 'extra_opts' are updated to reflect the mount options that worked.
- * If the retry fails, 'options' and 'extra_opts' are left unchanged.
+ * Returns TRUE if rewriting was successful; otherwise
+ * FALSE is returned if some failure occurred.
*/
-static int retry_nfsmount(const char *spec, const char *node,
- int flags, struct mount_options *options,
- int fake, char **extra_opts)
+static int
+nfs_rewrite_pmap_mount_options(struct mount_options *options)
{
- struct mount_options *retry_options;
- char *retry_str = NULL;
+ 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;
- retry_options = rewrite_mount_options(*extra_opts);
- if (!retry_options) {
- errno = EIO;
+ /*
+ * 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;
}
- if (po_join(retry_options, &retry_str) == PO_FAILED) {
- po_destroy(retry_options);
- errno = EIO;
+ /*
+ * 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 (verbose)
- printf(_("%s: text-based options (retry): '%s'\n"),
- progname, retry_str);
-
- if (!mount(spec, node, "nfs",
- flags & ~(MS_USER|MS_USERS), retry_str)) {
- free(*extra_opts);
- *extra_opts = retry_str;
- po_replace(options, retry_options);
- return 1;
+ if (!nfs_construct_new_options(options, &nfs_pmap, &mnt_pmap)) {
+ errno = EINVAL;
+ return 0;
}
- po_destroy(retry_options);
- free(retry_str);
- return 0;
+out:
+ errno = 0;
+ return 1;
}
/*
- * Attempt an NFSv2/3 mount via a mount(2) system call. If the kernel
- * claims the requested service isn't supported on the server, probe
- * the server to see what's supported, rewrite the mount options,
- * and retry the request.
+ * Do the mount(2) system call.
*
- * Returns 1 if successful. Otherwise, returns zero.
+ * Returns TRUE if successful, otherwise FALSE.
* "errno" is set to reflect the individual error.
- *
- * Side effect: If the retry is successful, both 'options' and
- * 'extra_opts' are updated to reflect the mount options that worked.
- * If the retry fails, 'options' and 'extra_opts' are left unchanged.
*/
-static int try_nfs23mount(const char *spec, const char *node,
- int flags, struct mount_options *options,
- int fake, char **extra_opts)
+static int nfs_sys_mount(struct nfsmount_info *mi, struct mount_options *opts)
{
- if (po_join(options, extra_opts) == PO_FAILED) {
+ char *options = NULL;
+ int result;
+
+ if (po_join(opts, &options) == PO_FAILED) {
errno = EIO;
return 0;
}
if (verbose)
- printf(_("%s: text-based options: '%s'\n"),
- progname, *extra_opts);
+ printf(_("%s: trying text-based options '%s'\n"),
+ progname, options);
- if (fake)
+ if (mi->fake)
return 1;
- if (!mount(spec, node, "nfs",
- flags & ~(MS_USER|MS_USERS), *extra_opts))
- 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;
+ }
+
+ if (!nfs_fix_mounthost_option(options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ if (!mi->fake && !nfs_verify_lock_option(options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
/*
- * The kernel returns EOPNOTSUPP if the RPC bind failed,
- * and EPROTONOSUPPORT if the version isn't supported.
+ * 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 (errno != EOPNOTSUPP && errno != EPROTONOSUPPORT)
- return 0;
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ goto out_fail;
+ }
+
+ if (!nfs_rewrite_pmap_mount_options(options))
+ goto out_fail;
+
+ result = nfs_sys_mount(mi, options);
+
+out_fail:
+ po_destroy(options);
+ return result;
+}
+
+/*
+ * For "-t nfs -o vers=4" or "-t nfs4" mounts.
+ */
+static int nfs_try_mount_v4(struct nfsmount_info *mi)
+{
+ struct sockaddr *sap = (struct sockaddr *)&mi->address;
+ struct mount_options *options = po_dup(mi->options);
+ int result = 0;
+
+ if (!options) {
+ errno = ENOMEM;
+ return result;
+ }
+
+ if (mi->version == 0) {
+ if (po_contains(options, "mounthost") ||
+ po_contains(options, "mountaddr") ||
+ po_contains(options, "mountvers") ||
+ po_contains(options, "mountproto")) {
+ /*
+ * Since these mountd options are set assume version 3
+ * is wanted so error out with EPROTONOSUPPORT so the
+ * protocol negation starts with v3.
+ */
+ errno = EPROTONOSUPPORT;
+ goto out_fail;
+ }
+ if (po_append(options, "vers=4") == PO_FAILED) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ }
+
+ if (!nfs_append_clientaddr_option(sap, mi->salen, options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
- return retry_nfsmount(spec, node, flags, options, fake, extra_opts);
+ /*
+ * Update option string to be recorded in /etc/mtab.
+ */
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ goto out_fail;
+ }
+
+ result = nfs_sys_mount(mi, options);
+
+out_fail:
+ po_destroy(options);
+ return result;
}
/*
- * Attempt an NFS v4 mount via a mount(2) system call.
+ * This is a single pass through the fg/bg loop.
*
- * Returns 1 if successful. Otherwise, returns zero.
+ * Returns TRUE if successful, otherwise FALSE.
* "errno" is set to reflect the individual error.
*/
-static int try_nfs4mount(const char *spec, const char *node,
- int flags, struct mount_options *options,
- int fake, char **extra_opts)
+static int nfs_try_mount(struct nfsmount_info *mi)
{
- if (po_join(options, extra_opts) == PO_FAILED) {
+ 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) {
+ /*
+ * To deal with legacy Linux servers that don't
+ * automatically export a pseudo root, retry
+ * ENOENT errors using version 3
+ */
+ if (errno != ENOENT)
+ 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;
+}
+
+/*
+ * Distinguish between permanent and temporary errors.
+ *
+ * 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).
+ *
+ * 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.
+ */
+static int nfs_is_permanent_error(int error)
+{
+ switch (error) {
+ case ESTALE:
+ case ETIMEDOUT:
+ case ECONNREFUSED:
+ return 0; /* temporary */
+ default:
+ return 1; /* permanent */
+ }
+}
+
+/*
+ * 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;
+
+ timeout = nfs_parse_retry_option(mi->options,
+ NFS_DEF_FG_TIMEOUT_MINUTES);
if (verbose)
- printf(_("%s: text-based options: '%s'\n"),
- progname, *extra_opts);
+ printf(_("%s: timeout set for %s"),
+ progname, ctime(&timeout));
- if (fake)
- return 1;
+ for (;;) {
+ if (nfs_try_mount(mi))
+ return EX_SUCCESS;
- if (!mount(spec, node, "nfs4",
- flags & ~(MS_USER|MS_USERS), *extra_opts))
- return 1;
- return 0;
+ 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;
}
/*
- * Try the mount(2) system call.
+ * Handle "background" NFS mount [first try]
*
- * Returns 1 if successful. Otherwise, returns zero.
- * "errno" is set to reflect the individual error.
+ * 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;
+ }
+
+ 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 try_mount(const char *spec, const char *node, const char *type,
- int flags, struct mount_options *options, int fake,
- char **extra_opts)
+static int nfsmount_child(struct nfsmount_info *mi)
{
- if (strncmp(type, "nfs4", 4) == 0)
- return try_nfs4mount(spec, node, flags,
- options, fake, extra_opts);
+ 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,
+};
+
+static int nfsmount_start(struct nfsmount_info *mi)
+{
+ if (!nfs_validate_options(mi))
+ return EX_FAIL;
+
+ if (po_rightmost(mi->options, nfs_background_opttbl) == 0)
+ return nfsmount_bg(mi);
else
- return try_nfs23mount(spec, node, flags,
- options, fake, extra_opts);
+ return nfsmount_fg(mi);
}
/**
int nfsmount_string(const char *spec, const char *node, const char *type,
int flags, char **extra_opts, int fake, int child)
{
- struct mount_options *options = NULL;
- struct sockaddr_in saddr;
- char *hostname;
- int err, retval = EX_FAIL;
-
- if (!parse_devname(spec, &hostname))
- goto out;
- err = fill_ipv4_sockaddr(hostname, &saddr);
- free(hostname);
- if (!err)
- goto out;
-
- options = po_split(*extra_opts);
- if (!options) {
+ 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);
- goto out;
- }
-
- if (!set_mandatory_options(type, &saddr, options))
- goto out;
- if (po_join(options, extra_opts) == PO_FAILED) {
- nfs_error(_("%s: internal option parsing error"), progname);
- goto out;
- }
-
- if (verbose)
- printf(_("%s: text-based options: '%s'\n"),
- progname, *extra_opts);
-
- if (!fake) {
- if (mount(spec, node, type,
- flags & ~(MS_USER|MS_USERS), *extra_opts)) {
- mount_error(spec, node, errno);
- goto out;
- }
- }
-
- retval = EX_SUCCESS;
-
-out:
- po_destroy(options);
+ free(mi.hostname);
return retval;
}
projects / nfs-utils.git / blobdiff