X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fstropts.c;h=a0b9e7fdf80a0f8967bda37c05b1ee34444769a0;hp=e3a3ac941d322c55950f7347a0b3f26154d71941;hb=2498a68b1bec01d0ee8a63962b314140e8289036;hpb=8034455d1fc4e315b54d100fd8138ce4c5c08471 diff --git a/utils/mount/stropts.c b/utils/mount/stropts.c index e3a3ac9..a0b9e7f 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 +63,114 @@ #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; + + 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; + } -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 +185,12 @@ 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); } /* @@ -170,148 +200,689 @@ 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)) + 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; + } - snprintf(new_option, sizeof(new_option) - 1, - "clientaddr=%s", inet_ntoa(my_addr.sin_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, +}; - if (po_append(options, new_option) == PO_SUCCEEDED) +static int nfs_verify_lock_option(struct mount_options *options) +{ + if (po_rightmost(options, nfs_lock_opttbl) == 0) return 1; - 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; +} + +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; } /* - * nfsmount_s - Mount an NFSv2 or v3 file system using C string options + * Set up mandatory non-version specific NFS mount 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 - * @child: one if this is a backgrounded mount + * Returns 1 if successful; otherwise zero. + */ +static int nfs_validate_options(struct nfsmount_info *mi) +{ + 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_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; +} + +/* + * Get NFS/mnt server addresses from mount options * - * XXX: need to handle bg, fg, and retry options. + * Returns 1 and fills in @nfs_saddr, @nfs_salen, @mnt_saddr, and @mnt_salen + * if all goes well; otherwise zero. */ -int nfsmount_s(const char *spec, const char *node, int flags, - char **extra_opts, int fake, int child) +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 = NULL; - struct sockaddr_in saddr; - char *hostname; - int err, retval = EX_FAIL; + char *option; - if (!parse_devname(spec, &hostname)) - goto out; - err = fill_ipv4_sockaddr(hostname, &saddr); - free(hostname); - if (!err) - goto out; + option = po_get(options, "addr"); + if (option == NULL) + return 0; + if (!nfs_string_to_sockaddr(option, nfs_saddr, nfs_salen)) + return 0; - options = po_split(*extra_opts); - if (!options) { - nfs_error(_("%s: internal option parsing error"), progname); - goto out; + 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; } - if (!append_addr_option(&saddr, options)) - goto out; + 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; + } - if (po_join(options, extra_opts) == PO_FAILED) { - nfs_error(_("%s: internal option parsing error"), progname); + 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; + } + + 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; +} + +/* + * 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 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 +nfs_rewrite_pmap_mount_options(struct mount_options *options) +{ + 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; } - 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); - goto out; - } + /* + * 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; } - retval = EX_SUCCESS; + if (!nfs_construct_new_options(options, &nfs_pmap, &mnt_pmap)) { + errno = EINVAL; + return 0; + } out: - po_destroy(options); - return retval; + errno = 0; + return 1; } /* - * nfs4mount_s - Mount an NFSv4 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 - * @child: one if this is a backgrounded mount - * - * XXX: need to handle bg, fg, and retry options. + * Do the mount(2) system call. * + * Returns TRUE if successful, otherwise FALSE. + * "errno" is set to reflect the individual error. */ -int nfs4mount_s(const char *spec, const char *node, int flags, - char **extra_opts, int fake, int child) +static int nfs_sys_mount(struct nfsmount_info *mi, struct mount_options *opts) { - struct mount_options *options = NULL; - struct sockaddr_in saddr; - char *hostname; - int err, retval = EX_FAIL; + char *options = NULL; + int result; - if (!parse_devname(spec, &hostname)) - goto out; - err = fill_ipv4_sockaddr(hostname, &saddr); - free(hostname); - if (!err) - goto out; + if (po_join(opts, &options) == PO_FAILED) { + errno = EIO; + 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; - options = po_split(*extra_opts); if (!options) { - nfs_error(_("%s: internal option parsing error"), progname); - goto out; + errno = ENOMEM; + return result; } - if (!append_addr_option(&saddr, options)) - goto out; + if (!nfs_fix_mounthost_option(options)) { + errno = EINVAL; + goto out_fail; + } + if (!mi->fake && !nfs_verify_lock_option(options)) { + errno = EINVAL; + goto out_fail; + } - if (!append_clientaddr_option(&saddr, options)) - goto out; + /* + * 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; + } - if (po_join(options, extra_opts) == PO_FAILED) { - nfs_error(_("%s: internal option parsing error"), progname); - goto out; + 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 (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); - goto out; + 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; } } - retval = EX_SUCCESS; + if (!nfs_append_clientaddr_option(sap, mi->salen, options)) { + errno = EINVAL; + goto out_fail; + } -out: + /* + * 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; +} + +/* + * 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) { + /* + * 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 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: timeout set for %s"), + progname, ctime(&timeout)); + + 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; +} + +/* + * 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; + } + + 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, +}; + +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); +} + +/** + * 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; }