*
*/
+#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;
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
return 0;
}
+/*
+ * 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 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 validate_options(const char *type,
+ struct sockaddr_in *saddr,
+ struct mount_options *options,
+ int fake)
{
if (!append_addr_option(saddr, options))
return 0;
} else {
if (!fix_mounthost_option(options))
return 0;
+ if (!fake && !verify_lock_option(options))
+ return 0;
}
return 1;
}
+/*
+ * Distinguish between permanent and temporary errors.
+ *
+ * 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.
+ */
+static int is_permanent_error(int error)
+{
+ switch (error) {
+ case ESTALE:
+ case ETIMEDOUT:
+ case ECONNREFUSED:
+ return 0; /* temporary */
+ default:
+ return 1; /* permanent */
+ }
+}
+
/*
* Reconstruct the mount option string based on a portmapper probe
* of the server. Returns one if the server's portmapper returned
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) {
}
/*
- * Attempt an NFSv2/3 mount via a mount(2) system call.
+ * Retry an NFS mount that failed because the requested service isn't
+ * available on the server.
*
* Returns 1 if successful. Otherwise, returns zero.
* "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 retry_nfsmount(const char *spec, const char *node,
+ int flags, struct mount_options *options,
+ int fake, char **extra_opts)
+{
+ struct mount_options *retry_options;
+ char *retry_str = NULL;
+
+ retry_options = rewrite_mount_options(*extra_opts);
+ if (!retry_options) {
+ errno = EIO;
+ return 0;
+ }
+
+ if (po_join(retry_options, &retry_str) == PO_FAILED) {
+ po_destroy(retry_options);
+ errno = EIO;
+ 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;
+ }
+
+ po_destroy(retry_options);
+ free(retry_str);
+ return 0;
+}
+
+/*
+ * 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.
+ *
+ * Returns 1 if successful. Otherwise, returns zero.
+ * "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,
if (!mount(spec, node, "nfs",
flags & ~(MS_USER|MS_USERS), *extra_opts))
return 1;
- return 0;
+
+ /*
+ * The kernel returns EOPNOTSUPP if the RPC bind failed,
+ * and EPROTONOSUPPORT if the version isn't supported.
+ */
+ if (errno != EOPNOTSUPP && errno != EPROTONOSUPPORT)
+ return 0;
+
+ return retry_nfsmount(spec, node, flags, options, fake, extra_opts);
}
/*
options, fake, extra_opts);
}
+/*
+ * 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(const char *spec, const char *node,
+ const char *type, int flags,
+ struct mount_options *options, int fake,
+ char **extra_opts)
+{
+ unsigned int secs = 1;
+ time_t timeout;
+
+ timeout = nfs_parse_retry_option(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))
+ return EX_SUCCESS;
+
+ if (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(spec, 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(const char *spec, const char *node,
+ const char *type, char *hostname, int flags,
+ struct mount_options *options,
+ int fake, char **extra_opts)
+{
+ if (try_mount(spec, node, type, flags, options,
+ fake, extra_opts))
+ return EX_SUCCESS;
+
+ if (is_permanent_error(errno)) {
+ mount_error(spec, node, errno);
+ return EX_FAIL;
+ }
+
+ sys_mount_errors(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(const char *spec, const char *node,
+ const char *type, char *hostname, int flags,
+ struct mount_options *options,
+ int fake, char **extra_opts)
+{
+ unsigned int secs = 1;
+ time_t timeout;
+
+ timeout = nfs_parse_retry_option(options, NFS_DEF_BG_TIMEOUT_MINUTES);
+
+ for (;;) {
+ if (sleep(secs))
+ break;
+ secs <<= 1;
+ if (secs > 120)
+ secs = 120;
+
+ if (try_mount(spec, node, type, flags, options,
+ fake, extra_opts))
+ return EX_SUCCESS;
+
+ if (is_permanent_error(errno))
+ break;
+
+ if (time(NULL) > timeout)
+ break;
+
+ sys_mount_errors(hostname, errno, 1, 1);
+ };
+
+ sys_mount_errors(hostname, errno, 1, 0);
+ return EX_FAIL;
+}
+
+/*
+ * Handle "background" NFS mount
+ *
+ * Returns a valid mount command exit code.
+ */
+static int nfsmount_bg(const char *spec, const char *node,
+ const char *type, char *hostname, int flags,
+ struct mount_options *options,
+ int fake, int child, char **extra_opts)
+{
+ if (!child)
+ return nfsmount_parent(spec, node, type, hostname, flags,
+ options, fake, extra_opts);
+ else
+ return nfsmount_child(spec, node, type, hostname, flags,
+ options, fake, extra_opts);
+}
+
/**
* nfsmount_string - Mount an NFS file system using C string options
* @spec: C string specifying remote share to mount ("hostname:path")
struct mount_options *options = NULL;
struct sockaddr_in saddr;
char *hostname;
- int err, retval = EX_FAIL;
+ int retval = EX_FAIL;
if (!parse_devname(spec, &hostname))
- goto out;
- err = fill_ipv4_sockaddr(hostname, &saddr);
- free(hostname);
- if (!err)
- goto out;
+ return retval;
+ if (!fill_ipv4_sockaddr(hostname, &saddr))
+ goto fail;
options = po_split(*extra_opts);
if (!options) {
nfs_error(_("%s: internal option parsing error"), progname);
- goto out;
+ goto fail;
}
- 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);
+ if (!validate_options(type, &saddr, options, fake))
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;
+ if (po_rightmost(options, "bg", "fg") == PO_KEY1_RIGHTMOST)
+ retval = nfsmount_bg(spec, node, type, hostname, flags,
+ options, fake, child, extra_opts);
+ else
+ retval = nfsmount_fg(spec, node, type, flags, options,
+ fake, extra_opts);
out:
po_destroy(options);
+fail:
+ free(hostname);
return retval;
}
projects / nfs-utils.git / blobdiff