*
*/
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <ctype.h>
#include <unistd.h>
#include <stdio.h>
#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;
-static int parse_devname(const char *spec, char **hostname)
+struct nfsmount_info {
+ const char *spec, /* server:/path */
+ *node, /* mounted-on dir */
+ *type; /* "nfs" or "nfs4" */
+ char *hostname; /* server's hostname */
+
+ struct mount_options *options; /* parsed mount options */
+ char **extra_opts; /* string for /etc/mtab */
+
+ int flags, /* MS_ flags */
+ fake, /* actually do the mount? */
+ child; /* forked bg child? */
+};
+
+static int nfs_parse_devname(struct nfsmount_info *mi)
{
int ret = 0;
char *dev, *pathname, *s;
- dev = xstrdup(spec);
+ dev = xstrdup(mi->spec);
if (!(pathname = strchr(dev, ':'))) {
nfs_error(_("%s: remote share not in 'host:dir' format"),
nfs_error(_("%s: ignoring hostnames that follow the first one"),
progname);
}
- *hostname = xstrdup(dev);
- if (strlen(*hostname) > NFS_MAXHOSTNAME) {
+ mi->hostname = xstrdup(dev);
+ if (strlen(mi->hostname) > NFS_MAXHOSTNAME) {
nfs_error(_("%s: server hostname is too long"),
progname);
- free(*hostname);
+ free(mi->hostname);
+ mi->hostname = NULL;
goto out;
}
return 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)
+{
+ char *retry_option, *endptr;
+
+ retry_option = po_get(options, "retry");
+ if (retry_option) {
+ long tmp;
+
+ errno = 0;
+ tmp = strtol(retry_option, &endptr, 10);
+ if (errno == 0 && endptr != retry_option && tmp >= 0)
+ timeout_minutes = tmp;
+ else if (verbose)
+ nfs_error(_("%s: invalid retry timeout was specified; "
+ "using default timeout"), progname);
+ }
+
+ return time(NULL) + (time_t)(timeout_minutes * 60);
+}
+
/*
* Append the 'addr=' option to the options string to pass a resolved
* server address to the kernel. After a successful mount, this address
}
/*
- * Set up mandatory mount options.
+ * Returns zero if the "lock" option is in effect, but statd
+ * can't be started. Otherwise, returns 1.
+ */
+static int verify_lock_option(struct mount_options *options)
+{
+ if (po_rightmost(options, "nolock", "lock") == PO_KEY1_RIGHTMOST)
+ 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;
+ }
+
+ return 1;
+}
+
+/*
+ * Set up mandatory 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_in saddr;
+
+ if (!fill_ipv4_sockaddr(mi->hostname, &saddr))
return 0;
- if (strncmp(type, "nfs4", 4) == 0) {
- if (!append_clientaddr_option(saddr, options))
+ if (strncmp(mi->type, "nfs4", 4) == 0) {
+ if (!append_clientaddr_option(&saddr, mi->options))
return 0;
} else {
- if (!fix_mounthost_option(options))
+ if (!fix_mounthost_option(mi->options))
+ return 0;
+ if (!mi->fake && !verify_lock_option(mi->options))
return 0;
}
+ if (!append_addr_option(&saddr, mi->options))
+ return 0;
+
return 1;
}
static int is_permanent_error(int error)
{
switch (error) {
- case EACCES:
case ESTALE:
case ETIMEDOUT:
case ECONNREFUSED:
clnt_addr_t nfs_server = { };
int p;
+ errno = EIO;
+
options = po_split(str);
if (!options)
return NULL;
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);
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) {
po_remove_all(options, "udp");
if (!probe_bothports(&mnt_server, &nfs_server)) {
- rpc_mount_errors("rpcbind", 0, 0);
+ errno = ESPIPE;
goto err;
}
}
+ errno = 0;
return options;
err:
return NULL;
}
+/*
+ * Do the mount(2) system call.
+ *
+ * Returns 1 if successful, otherwise zero.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_sys_mount(const struct nfsmount_info *mi, const char *type,
+ const char *options)
+{
+ int result;
+
+ result = mount(mi->spec, mi->node, 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;
+}
+
/*
* Retry an NFS mount that failed because the requested service isn't
* available on the server.
* 'extra_opts' are updated to reflect the mount options that worked.
* If the retry fails, 'options' and 'extra_opts' are left unchanged.
*/
-static int retry_nfsmount(const char *spec, const char *node,
- int flags, struct mount_options *options,
- int fake, char **extra_opts)
+static int nfs_retry_nfs23mount(struct nfsmount_info *mi)
{
struct mount_options *retry_options;
char *retry_str = NULL;
+ char **extra_opts = mi->extra_opts;
retry_options = rewrite_mount_options(*extra_opts);
- if (!retry_options) {
- errno = EIO;
+ if (!retry_options)
return 0;
- }
if (po_join(retry_options, &retry_str) == PO_FAILED) {
po_destroy(retry_options);
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_sys_mount(mi, "nfs", retry_str)) {
+ po_destroy(retry_options);
+ free(retry_str);
+ return 0;
}
- po_destroy(retry_options);
- free(retry_str);
- return 0;
+ free(*extra_opts);
+ *extra_opts = retry_str;
+ po_replace(mi->options, retry_options);
+ return 1;
}
/*
* '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_try_nfs23mount(struct nfsmount_info *mi)
{
- if (po_join(options, extra_opts) == PO_FAILED) {
+ char **extra_opts = mi->extra_opts;
+
+ if (po_join(mi->options, extra_opts) == PO_FAILED) {
errno = EIO;
return 0;
}
printf(_("%s: text-based options: '%s'\n"),
progname, *extra_opts);
- if (fake)
+ if (mi->fake)
return 1;
- if (!mount(spec, node, "nfs",
- flags & ~(MS_USER|MS_USERS), *extra_opts))
+ if (nfs_sys_mount(mi, "nfs", *extra_opts))
return 1;
/*
if (errno != EOPNOTSUPP && errno != EPROTONOSUPPORT)
return 0;
- return retry_nfsmount(spec, node, flags, options, fake, extra_opts);
+ return nfs_retry_nfs23mount(mi);
}
/*
* Returns 1 if successful. Otherwise, returns zero.
* "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_nfs4mount(struct nfsmount_info *mi)
{
- if (po_join(options, extra_opts) == PO_FAILED) {
+ char **extra_opts = mi->extra_opts;
+
+ if (po_join(mi->options, extra_opts) == PO_FAILED) {
errno = EIO;
return 0;
}
printf(_("%s: text-based options: '%s'\n"),
progname, *extra_opts);
- if (fake)
+ if (mi->fake)
return 1;
- if (!mount(spec, node, "nfs4",
- flags & ~(MS_USER|MS_USERS), *extra_opts))
- return 1;
- return 0;
+ return nfs_sys_mount(mi, "nfs4", *extra_opts);
}
/*
- * Try the mount(2) system call.
+ * Perform either an NFSv2/3 mount, or an NFSv4 mount system call.
*
* Returns 1 if successful. Otherwise, returns zero.
* "errno" is set to reflect the individual error.
*/
-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 nfs_try_mount(struct nfsmount_info *mi)
{
- if (strncmp(type, "nfs4", 4) == 0)
- return try_nfs4mount(spec, node, flags,
- options, fake, extra_opts);
+ if (strncmp(mi->type, "nfs4", 4) == 0)
+ return nfs_try_nfs4mount(mi);
else
- return try_nfs23mount(spec, node, flags,
- options, fake, extra_opts);
+ return nfs_try_nfs23mount(mi);
}
/*
*
* Returns a valid mount command exit code.
*/
-static int nfsmount_fg(const char *spec, const char *node,
- const char *type, int flags,
- struct mount_options *options, int fake,
- char **extra_opts)
+static int nfsmount_fg(struct nfsmount_info *mi)
{
unsigned int secs = 1;
- time_t timeout = time(NULL);
- char *retry;
-
- timeout += 60 * 2; /* default: 2 minutes */
- retry = po_get(options, "retry");
- if (retry)
- timeout += 60 * atoi(retry);
+ 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 (try_mount(spec, node, type, flags,
- options, fake, extra_opts))
+ if (nfs_try_mount(mi))
return EX_SUCCESS;
if (is_permanent_error(errno))
}
};
- mount_error(spec, node, errno);
+ 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 (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 (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 int nfsmount_start(struct nfsmount_info *mi)
+{
+ if (!nfs_validate_options(mi))
+ return EX_FAIL;
+
+ if (po_rightmost(mi->options, "bg", "fg") == PO_KEY1_RIGHTMOST)
+ 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")
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;
+ struct nfsmount_info mi = {
+ .spec = spec,
+ .node = node,
+ .type = type,
+ .extra_opts = extra_opts,
+ .flags = flags,
+ .fake = fake,
+ .child = child,
+ };
+ int retval = EX_FAIL;
- if (!parse_devname(spec, &hostname))
- goto out;
- err = fill_ipv4_sockaddr(hostname, &saddr);
- free(hostname);
- if (!err)
- goto out;
+ if (!nfs_parse_devname(&mi))
+ return retval;
- options = po_split(*extra_opts);
- if (!options) {
+ 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;
}
projects / nfs-utils.git / blobdiff