#include <sys/systeminfo.h>
#define MAXISALEN 257 /* based on sysinfo(2) man page */
-#ifdef HAVE_ZPL
static int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *);
zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
zfs_share_proto_t);
return (B_TRUE);
}
+/*
+ * The filesystem is mounted by invoking the system mount utility rather
+ * than by the system call mount(2). This ensures that the /etc/mtab
+ * file is correctly locked for the update. Performing our own locking
+ * and /etc/mtab update requires making an unsafe assumption about how
+ * the mount utility performs its locking. Unfortunately, this also means
+ * in the case of a mount failure we do not have the exact errno. We must
+ * make due with return value from the mount process.
+ *
+ * In the long term a shared library called libmount is under development
+ * which provides a common API to address the locking and errno issues.
+ * Once the standard mount utility has been updated to use this library
+ * we can add an autoconf check to conditionally use it.
+ *
+ * http://www.kernel.org/pub/linux/utils/util-linux/libmount-docs/index.html
+ */
+
+static int
+do_mount(const char *src, const char *mntpt, char *opts)
+{
+ char *argv[8] = {
+ "/bin/mount",
+ "-t", MNTTYPE_ZFS,
+ "-o", opts,
+ (char *)src,
+ (char *)mntpt,
+ (char *)NULL };
+ int rc;
+
+ /* Return only the most critical mount error */
+ rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE);
+ if (rc) {
+ if (rc & MOUNT_FILEIO)
+ return (EIO);
+ if (rc & MOUNT_USER)
+ return (EINTR);
+ if (rc & MOUNT_SOFTWARE)
+ return (EPIPE);
+ if (rc & MOUNT_BUSY)
+ return (EBUSY);
+ if (rc & MOUNT_SYSERR)
+ return (EAGAIN);
+ if (rc & MOUNT_USAGE)
+ return (EINVAL);
+
+ return (ENXIO); /* Generic error */
+ }
+
+ return (0);
+}
+
+static int
+do_unmount(const char *mntpt, int flags)
+{
+ char force_opt[] = "-f";
+ char lazy_opt[] = "-l";
+ char *argv[7] = {
+ "/bin/umount",
+ "-t", MNTTYPE_ZFS,
+ NULL, NULL, NULL, NULL };
+ int rc, count = 3;
+
+ if (flags & MS_FORCE) {
+ argv[count] = force_opt;
+ count++;
+ }
+
+ if (flags & MS_DETACH) {
+ argv[count] = lazy_opt;
+ count++;
+ }
+
+ argv[count] = (char *)mntpt;
+ rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE);
+
+ return (rc ? EINVAL : 0);
+}
+
+static int
+zfs_add_option(zfs_handle_t *zhp, char *options, int len,
+ zfs_prop_t prop, char *on, char *off)
+{
+ char *source;
+ uint64_t value;
+
+ /* Skip adding duplicate default options */
+ if ((strstr(options, on) != NULL) || (strstr(options, off) != NULL))
+ return (0);
+
+ /*
+ * zfs_prop_get_int() to not used to ensure our mount options
+ * are not influenced by the current /etc/mtab contents.
+ */
+ value = getprop_uint64(zhp, prop, &source);
+
+ (void) strlcat(options, ",", len);
+ (void) strlcat(options, value ? on : off, len);
+
+ return (0);
+}
+
+static int
+zfs_add_options(zfs_handle_t *zhp, char *options, int len)
+{
+ int error = 0;
+
+ error = zfs_add_option(zhp, options, len,
+ ZFS_PROP_ATIME, MNTOPT_ATIME, MNTOPT_NOATIME);
+ error = error ? error : zfs_add_option(zhp, options, len,
+ ZFS_PROP_DEVICES, MNTOPT_DEVICES, MNTOPT_NODEVICES);
+ error = error ? error : zfs_add_option(zhp, options, len,
+ ZFS_PROP_EXEC, MNTOPT_EXEC, MNTOPT_NOEXEC);
+ error = error ? error : zfs_add_option(zhp, options, len,
+ ZFS_PROP_READONLY, MNTOPT_RO, MNTOPT_RW);
+ error = error ? error : zfs_add_option(zhp, options, len,
+ ZFS_PROP_SETUID, MNTOPT_SETUID, MNTOPT_NOSETUID);
+ error = error ? error : zfs_add_option(zhp, options, len,
+ ZFS_PROP_XATTR, MNTOPT_XATTR, MNTOPT_NOXATTR);
+ error = error ? error : zfs_add_option(zhp, options, len,
+ ZFS_PROP_NBMAND, MNTOPT_NBMAND, MNTOPT_NONBMAND);
+
+ return (error);
+}
+
/*
* Mount the given filesystem.
*/
char mountpoint[ZFS_MAXPROPLEN];
char mntopts[MNT_LINE_MAX];
libzfs_handle_t *hdl = zhp->zfs_hdl;
+ int remount = 0, rc;
- if (options == NULL)
- mntopts[0] = '\0';
- else
+ if (options == NULL) {
+ (void) strlcpy(mntopts, MNTOPT_DEFAULTS, sizeof (mntopts));
+ } else {
(void) strlcpy(mntopts, options, sizeof (mntopts));
+ }
+
+ if (strstr(mntopts, MNTOPT_REMOUNT) != NULL)
+ remount = 1;
/*
* If the pool is imported read-only then all mounts must be read-only
*/
if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
- flags |= MS_RDONLY;
+ (void) strlcat(mntopts, "," MNTOPT_RO, sizeof (mntopts));
+
+ /*
+ * Append default mount options which apply to the mount point.
+ * This is done because under Linux (unlike Solaris) multiple mount
+ * points may reference a single super block. This means that just
+ * given a super block there is no back reference to update the per
+ * mount point options.
+ */
+ rc = zfs_add_options(zhp, mntopts, sizeof (mntopts));
+ if (rc) {
+ zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+ "default options unavailable"));
+ return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
+ dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
+ mountpoint));
+ }
+
+ /*
+ * Append zfsutil option so the mount helper allow the mount
+ */
+ strlcat(mntopts, "," MNTOPT_ZFSUTIL, sizeof (mntopts));
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
return (0);
/*
* Determine if the mountpoint is empty. If so, refuse to perform the
- * mount. We don't perform this check if MS_OVERLAY is specified, which
- * would defeat the point. We also avoid this check if 'remount' is
- * specified.
+ * mount. We don't perform this check if 'remount' is
+ * specified or if overlay option(-O) is given
*/
- if ((flags & MS_OVERLAY) == 0 &&
- strstr(mntopts, MNTOPT_REMOUNT) == NULL &&
+ if ((flags & MS_OVERLAY) == 0 && !remount &&
!dir_is_empty(mountpoint)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"directory is not empty"));
}
/* perform the mount */
- if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
- MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
+ rc = do_mount(zfs_get_name(zhp), mountpoint, mntopts);
+ if (rc) {
/*
* Generic errors are nasty, but there are just way too many
* from mount(), and they're well-understood. We pick a few
* common ones to improve upon.
*/
- if (errno == EBUSY) {
+ if (rc == EBUSY) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"mountpoint or dataset is busy"));
- } else if (errno == EPERM) {
+ } else if (rc == EPERM) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Insufficient privileges"));
- } else if (errno == ENOTSUP) {
+ } else if (rc == ENOTSUP) {
char buf[256];
int spa_version;
ZFS_PROP_VERSION), spa_version);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, buf));
} else {
- zfs_error_aux(hdl, strerror(errno));
+ zfs_error_aux(hdl, strerror(rc));
}
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
zhp->zfs_name));
}
+ /* remove the mounted entry before re-adding on remount */
+ if (remount)
+ libzfs_mnttab_remove(hdl, zhp->zfs_name);
+
/* add the mounted entry into our cache */
- libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint,
- mntopts);
+ libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint, mntopts);
return (0);
}
static int
unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
{
- if (umount2(mountpoint, flags) != 0) {
- zfs_error_aux(hdl, strerror(errno));
+ int error;
+
+ error = do_unmount(mountpoint, flags);
+ if (error != 0) {
return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
mountpoint));
if (!zfs_is_mounted(zhp, &mountpoint))
return (SHARED_NOT_SHARED);
- if (rc = is_shared(zhp->zfs_hdl, mountpoint, proto)) {
+ if ((rc = is_shared(zhp->zfs_hdl, mountpoint, proto))) {
if (where != NULL)
*where = mountpoint;
else
PROTO_SMB) != SHARED_NOT_SHARED);
}
-/*
- * Make sure things will work if libshare isn't installed by using
- * wrapper functions that check to see that the pointers to functions
- * initialized in _zfs_init_libshare() are actually present.
- */
-
-static sa_handle_t (*_sa_init)(int);
-static void (*_sa_fini)(sa_handle_t);
-static sa_share_t (*_sa_find_share)(sa_handle_t, char *);
-static int (*_sa_enable_share)(sa_share_t, char *);
-static int (*_sa_disable_share)(sa_share_t, char *);
-static char *(*_sa_errorstr)(int);
-static int (*_sa_parse_legacy_options)(sa_group_t, char *, char *);
-static boolean_t (*_sa_needs_refresh)(sa_handle_t *);
-static libzfs_handle_t *(*_sa_get_zfs_handle)(sa_handle_t);
-static int (*_sa_zfs_process_share)(sa_handle_t, sa_group_t, sa_share_t,
- char *, char *, zprop_source_t, char *, char *, char *);
-static void (*_sa_update_sharetab_ts)(sa_handle_t);
-
-/*
- * _zfs_init_libshare()
- *
- * Find the libshare.so.1 entry points that we use here and save the
- * values to be used later. This is triggered by the runtime loader.
- * Make sure the correct ISA version is loaded.
- */
-#ifdef __GNUC__
-static void
-_zfs_init_libshare(void) __attribute__((constructor));
-#else
-#pragma init(_zfs_init_libshare)
-#endif
-static void
-_zfs_init_libshare(void)
-{
- void *libshare;
- char path[MAXPATHLEN];
- char isa[MAXISALEN];
-
-#if defined(_LP64)
- if (sysinfo(SI_ARCHITECTURE_64, isa, MAXISALEN) == -1)
- isa[0] = '\0';
-#else
- isa[0] = '\0';
-#endif
- (void) snprintf(path, MAXPATHLEN,
- "/usr/lib/%s/libshare.so.1", isa);
-
- if ((libshare = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)) != NULL) {
- _sa_init = (sa_handle_t (*)(int))dlsym(libshare, "sa_init");
- _sa_fini = (void (*)(sa_handle_t))dlsym(libshare, "sa_fini");
- _sa_find_share = (sa_share_t (*)(sa_handle_t, char *))
- dlsym(libshare, "sa_find_share");
- _sa_enable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
- "sa_enable_share");
- _sa_disable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
- "sa_disable_share");
- _sa_errorstr = (char *(*)(int))dlsym(libshare, "sa_errorstr");
- _sa_parse_legacy_options = (int (*)(sa_group_t, char *, char *))
- dlsym(libshare, "sa_parse_legacy_options");
- _sa_needs_refresh = (boolean_t (*)(sa_handle_t *))
- dlsym(libshare, "sa_needs_refresh");
- _sa_get_zfs_handle = (libzfs_handle_t *(*)(sa_handle_t))
- dlsym(libshare, "sa_get_zfs_handle");
- _sa_zfs_process_share = (int (*)(sa_handle_t, sa_group_t,
- sa_share_t, char *, char *, zprop_source_t, char *,
- char *, char *))dlsym(libshare, "sa_zfs_process_share");
- _sa_update_sharetab_ts = (void (*)(sa_handle_t))
- dlsym(libshare, "sa_update_sharetab_ts");
- if (_sa_init == NULL || _sa_fini == NULL ||
- _sa_find_share == NULL || _sa_enable_share == NULL ||
- _sa_disable_share == NULL || _sa_errorstr == NULL ||
- _sa_parse_legacy_options == NULL ||
- _sa_needs_refresh == NULL || _sa_get_zfs_handle == NULL ||
- _sa_zfs_process_share == NULL ||
- _sa_update_sharetab_ts == NULL) {
- _sa_init = NULL;
- _sa_fini = NULL;
- _sa_disable_share = NULL;
- _sa_enable_share = NULL;
- _sa_errorstr = NULL;
- _sa_parse_legacy_options = NULL;
- (void) dlclose(libshare);
- _sa_needs_refresh = NULL;
- _sa_get_zfs_handle = NULL;
- _sa_zfs_process_share = NULL;
- _sa_update_sharetab_ts = NULL;
- }
- }
-}
-
/*
* zfs_init_libshare(zhandle, service)
*
{
int ret = SA_OK;
- if (_sa_init == NULL)
- ret = SA_CONFIG_ERR;
-
if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
/*
* We had a cache miss. Most likely it is a new ZFS
* internal cache.
*/
zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
- if (_sa_needs_refresh != NULL &&
- _sa_needs_refresh(zhandle->libzfs_sharehdl)) {
+ if (sa_needs_refresh(zhandle->libzfs_sharehdl)) {
zfs_uninit_libshare(zhandle);
- zhandle->libzfs_sharehdl = _sa_init(service);
+ zhandle->libzfs_sharehdl = sa_init(service);
}
}
if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
- zhandle->libzfs_sharehdl = _sa_init(service);
+ zhandle->libzfs_sharehdl = sa_init(service);
if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
ret = SA_NO_MEMORY;
zfs_uninit_libshare(libzfs_handle_t *zhandle)
{
if (zhandle != NULL && zhandle->libzfs_sharehdl != NULL) {
- if (_sa_fini != NULL)
- _sa_fini(zhandle->libzfs_sharehdl);
+ sa_fini(zhandle->libzfs_sharehdl);
zhandle->libzfs_sharehdl = NULL;
}
}
int
zfs_parse_options(char *options, zfs_share_proto_t proto)
{
- if (_sa_parse_legacy_options != NULL) {
- return (_sa_parse_legacy_options(NULL, options,
- proto_table[proto].p_name));
- }
- return (SA_CONFIG_ERR);
-}
-
-/*
- * zfs_sa_find_share(handle, path)
- *
- * wrapper around sa_find_share to find a share path in the
- * configuration.
- */
-static sa_share_t
-zfs_sa_find_share(sa_handle_t handle, char *path)
-{
- if (_sa_find_share != NULL)
- return (_sa_find_share(handle, path));
- return (NULL);
-}
-
-/*
- * zfs_sa_enable_share(share, proto)
- *
- * Wrapper for sa_enable_share which enables a share for a specified
- * protocol.
- */
-static int
-zfs_sa_enable_share(sa_share_t share, char *proto)
-{
- if (_sa_enable_share != NULL)
- return (_sa_enable_share(share, proto));
- return (SA_CONFIG_ERR);
-}
-
-/*
- * zfs_sa_disable_share(share, proto)
- *
- * Wrapper for sa_enable_share which disables a share for a specified
- * protocol.
- */
-static int
-zfs_sa_disable_share(sa_share_t share, char *proto)
-{
- if (_sa_disable_share != NULL)
- return (_sa_disable_share(share, proto));
- return (SA_CONFIG_ERR);
+ return (sa_parse_legacy_options(NULL, options,
+ proto_table[proto].p_name));
}
/*
* Share the given filesystem according to the options in the specified
* protocol specific properties (sharenfs, sharesmb). We rely
- * on "libshare" to the dirty work for us.
+ * on "libshare" to do the dirty work for us.
*/
static int
zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
if ((ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
(void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
- zfs_get_name(zhp), _sa_errorstr != NULL ?
- _sa_errorstr(ret) : "");
+ zfs_get_name(zhp), sa_errorstr(ret));
return (-1);
}
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
continue;
- share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint);
+ share = sa_find_share(hdl->libzfs_sharehdl, mountpoint);
if (share == NULL) {
/*
* This may be a new file system that was just
* safe to add this to the internal
* configuration.
*/
- if (_sa_zfs_process_share(hdl->libzfs_sharehdl,
+ if (sa_zfs_process_share(hdl->libzfs_sharehdl,
NULL, NULL, mountpoint,
proto_table[*curr_proto].p_name, sourcetype,
shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
return (-1);
}
hdl->libzfs_shareflags |= ZFSSHARE_MISS;
- share = zfs_sa_find_share(hdl->libzfs_sharehdl,
+ share = sa_find_share(hdl->libzfs_sharehdl,
mountpoint);
}
if (share != NULL) {
int err;
- err = zfs_sa_enable_share(share,
+ err = sa_enable_share(share,
proto_table[*curr_proto].p_name);
if (err != SA_OK) {
(void) zfs_error_fmt(hdl,
free(mntpt); /* don't need the copy anymore */
return (zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
- name, _sa_errorstr(err)));
+ name, sa_errorstr(err)));
}
- share = zfs_sa_find_share(hdl->libzfs_sharehdl, mntpt);
+ share = sa_find_share(hdl->libzfs_sharehdl, mntpt);
free(mntpt); /* don't need the copy anymore */
if (share != NULL) {
- err = zfs_sa_disable_share(share, proto_table[proto].p_name);
+ err = sa_disable_share(share, proto_table[proto].p_name);
if (err != SA_OK) {
return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
- name, _sa_errorstr(err)));
+ name, sa_errorstr(err)));
}
} else {
return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
char *mntpt = NULL;
/* check to see if need to unmount the filesystem */
- rewind(zhp->zfs_hdl->libzfs_mnttab);
if (mountpoint != NULL)
mountpoint = mntpt = zfs_strdup(hdl, mountpoint);
if (is_shared(hdl, mntpt, *curr_proto) &&
unshare_one(hdl, zhp->zfs_name,
- mntpt, *curr_proto) != 0) {
+ mntpt, *curr_proto) != 0) {
if (mntpt != NULL)
free(mntpt);
return (-1);
* Unshare and unmount all datasets within the given pool. We don't want to
* rely on traversing the DSL to discover the filesystems within the pool,
* because this may be expensive (if not all of them are mounted), and can fail
- * arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and
+ * arbitrarily (on I/O error, for example). Instead, we walk /etc/mtab and
* gather all the filesystems that are currently mounted.
*/
int
return (ret);
}
-
-#else /* HAVE_ZPL */
-
-int
-zfs_unshare_iscsi(zfs_handle_t *zhp)
-{
- return 0;
-}
-
-int
-zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
-{
- return 0;
-}
-
-void
-remove_mountpoint(zfs_handle_t *zhp) {
- return;
-}
-
-boolean_t
-is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where)
-{
- return B_FALSE;
-}
-
-boolean_t
-zfs_is_mounted(zfs_handle_t *zhp, char **where)
-{
- return is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where);
-}
-
-boolean_t
-zfs_is_shared(zfs_handle_t *zhp)
-{
- return B_FALSE;
-}
-
-int
-zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
-{
- return B_FALSE;
-}
-
-int
-zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
-{
- return B_FALSE;
-}
-#endif /* HAVE_ZPL */