X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fstropts.c;h=ceefdb0fc24cecb5a5215db809fbe01fece76251;hp=b6d3a12292ff0a0ccd906010c5a831b611b1942a;hb=a8b90e8f64a7d53b20c0980f2a6d9a8d5945bcc4;hpb=4ce9ddfb03de06e90fb4cf0eb5767cb0e3a98905 diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c index b6d3a12..ceefdb0 100644 --- a/utils/mount/stropts.c +++ b/utils/mount/stropts.c @@ -21,36 +21,38 @@ * */ -#include +#ifdef HAVE_CONFIG_H +#include +#endif + #include -#include -#include -#include #include #include #include + #include #include +#include +#include #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 -#else -#include -#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 @@ -61,79 +63,95 @@ #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; - } +/* + * 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; - /* - * 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; + 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; } - ret = 1; - -out: - free(dev); - return ret; + 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; } /* @@ -148,19 +166,12 @@ static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr) * 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); } /* @@ -170,358 +181,616 @@ static int append_addr_option(struct sockaddr_in *saddr, * 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; + } - snprintf(new_option, sizeof(new_option) - 1, - "mountaddr=%s", inet_ntoa(maddr.sin_addr)); - - if (po_append(options, new_option) == PO_SUCCEEDED) - return 1; - return 0; + return nfs_append_generic_address_option(sap, salen, + "mountaddr", options); } /* - * Set up mandatory mount options. - * - * Returns 1 if successful; otherwise zero. + * Returns zero if the "lock" option is in effect, but statd + * can't be started. Otherwise, returns 1. */ -static int set_mandatory_options(const char *type, - struct sockaddr_in *saddr, - struct mount_options *options) +static const char *nfs_lock_opttbl[] = { + "nolock", + "lock", + NULL, +}; + +static int nfs_verify_lock_option(struct mount_options *options) { - if (!append_addr_option(saddr, options)) - return 0; + if (po_rightmost(options, nfs_lock_opttbl) == 0) + return 1; - if (strncmp(type, "nfs4", 4) == 0) { - if (!append_clientaddr_option(saddr, options)) - return 0; - } else { - if (!fix_mounthost_option(options)) - return 0; + 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; } 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; +} + /* - * Distinguish between permanent and temporary errors. + * Set up mandatory non-version specific NFS mount options. * - * Returns 0 if the passed-in error is temporary, thus the - * mount system call should be retried; returns one if the - * passed-in error is permanent, thus the mount system call - * should not be retried. + * Returns 1 if successful; otherwise zero. */ -static int is_permanent_error(int error) +static int nfs_validate_options(struct nfsmount_info *mi) { - switch (error) { - case EACCES: - case ESTALE: - case ETIMEDOUT: - case ECONNREFUSED: - return 0; /* temporary */ - default: - return 1; /* permanent */ + struct sockaddr *sap = (struct sockaddr *)&mi->address; + + 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; + } + /* + * 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; + + 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) + 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_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; + } + /* + * Update option string to be recorded in /etc/mtab. + */ + if (po_join(options, mi->extra_opts) == PO_FAILED) { + errno = ENOMEM; return 0; + } + + result = nfs_sys_mount(mi, options); - return retry_nfsmount(spec, node, flags, options, fake, extra_opts); +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) + 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 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_parent(struct nfsmount_info *mi) { - if (strncmp(type, "nfs4", 4) == 0) - return try_nfs4mount(spec, node, flags, - options, fake, extra_opts); + 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 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 try_nfs23mount(spec, node, flags, - options, fake, extra_opts); + 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 nfsmount_fg(mi); } /** @@ -538,35 +807,24 @@ static int try_mount(const char *spec, const char *node, const char *type, 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 (try_mount(spec, node, type, flags, options, fake, extra_opts)) { - mount_error(spec, node, errno); - goto out; - } - - retval = EX_SUCCESS; - -out: - po_destroy(options); + free(mi.hostname); return retval; }