diff options
Diffstat (limited to 'lib/libzfs/os/linux/libzfs_util_os.c')
| -rw-r--r-- | lib/libzfs/os/linux/libzfs_util_os.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/lib/libzfs/os/linux/libzfs_util_os.c b/lib/libzfs/os/linux/libzfs_util_os.c new file mode 100644 index 000000000..c27dc91bc --- /dev/null +++ b/lib/libzfs/os/linux/libzfs_util_os.c @@ -0,0 +1,184 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + + +#include <errno.h> +#include <fcntl.h> +#include <libintl.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <strings.h> +#include <unistd.h> +#include <math.h> +#include <sys/stat.h> +#include <sys/mnttab.h> +#include <sys/mntent.h> +#include <sys/types.h> +#include <sys/wait.h> + +#include <libzfs.h> +#include <libzfs_core.h> + +#include "libzfs_impl.h" +#include "zfs_prop.h" +#include <libzutil.h> + +#define ZDIFF_SHARESDIR "/.zfs/shares/" + +int +zfs_ioctl(libzfs_handle_t *hdl, int request, zfs_cmd_t *zc) +{ + return (ioctl(hdl->libzfs_fd, request, zc)); +} + +const char * +libzfs_error_init(int error) +{ + switch (error) { + case ENXIO: + return (dgettext(TEXT_DOMAIN, "The ZFS modules are not " + "loaded.\nTry running '/sbin/modprobe zfs' as root " + "to load them.")); + case ENOENT: + return (dgettext(TEXT_DOMAIN, "/dev/zfs and /proc/self/mounts " + "are required.\nTry running 'udevadm trigger' and 'mount " + "-t proc proc /proc' as root.")); + case ENOEXEC: + return (dgettext(TEXT_DOMAIN, "The ZFS modules cannot be " + "auto-loaded.\nTry running '/sbin/modprobe zfs' as " + "root to manually load them.")); + case EACCES: + return (dgettext(TEXT_DOMAIN, "Permission denied the " + "ZFS utilities must be run as root.")); + default: + return (dgettext(TEXT_DOMAIN, "Failed to initialize the " + "libzfs library.")); + } +} + +static int +libzfs_module_loaded(const char *module) +{ + const char path_prefix[] = "/sys/module/"; + char path[256]; + + memcpy(path, path_prefix, sizeof (path_prefix) - 1); + strcpy(path + sizeof (path_prefix) - 1, module); + + return (access(path, F_OK) == 0); +} + +/* + * Verify the required ZFS_DEV device is available and optionally attempt + * to load the ZFS modules. Under normal circumstances the modules + * should already have been loaded by some external mechanism. + * + * Environment variables: + * - ZFS_MODULE_LOADING="YES|yes|ON|on" - Attempt to load modules. + * - ZFS_MODULE_TIMEOUT="<seconds>" - Seconds to wait for ZFS_DEV + */ +static int +libzfs_load_module_impl(const char *module) +{ + char *argv[4] = {"/sbin/modprobe", "-q", (char *)module, (char *)0}; + char *load_str, *timeout_str; + long timeout = 10; /* seconds */ + long busy_timeout = 10; /* milliseconds */ + int load = 0, fd; + hrtime_t start; + + /* Optionally request module loading */ + if (!libzfs_module_loaded(module)) { + load_str = getenv("ZFS_MODULE_LOADING"); + if (load_str) { + if (!strncasecmp(load_str, "YES", strlen("YES")) || + !strncasecmp(load_str, "ON", strlen("ON"))) + load = 1; + else + load = 0; + } + + if (load) { + if (libzfs_run_process("/sbin/modprobe", argv, 0)) + return (ENOEXEC); + } + + if (!libzfs_module_loaded(module)) + return (ENXIO); + } + + /* + * Device creation by udev is asynchronous and waiting may be + * required. Busy wait for 10ms and then fall back to polling every + * 10ms for the allowed timeout (default 10s, max 10m). This is + * done to optimize for the common case where the device is + * immediately available and to avoid penalizing the possible + * case where udev is slow or unable to create the device. + */ + timeout_str = getenv("ZFS_MODULE_TIMEOUT"); + if (timeout_str) { + timeout = strtol(timeout_str, NULL, 0); + timeout = MAX(MIN(timeout, (10 * 60)), 0); /* 0 <= N <= 600 */ + } + + start = gethrtime(); + do { + fd = open(ZFS_DEV, O_RDWR); + if (fd >= 0) { + (void) close(fd); + return (0); + } else if (errno != ENOENT) { + return (errno); + } else if (NSEC2MSEC(gethrtime() - start) < busy_timeout) { + sched_yield(); + } else { + usleep(10 * MILLISEC); + } + } while (NSEC2MSEC(gethrtime() - start) < (timeout * MILLISEC)); + + return (ENOENT); +} + +int +libzfs_load_module(void) +{ + return (libzfs_load_module_impl(ZFS_DRIVER)); +} + +int +find_shares_object(differ_info_t *di) +{ + char fullpath[MAXPATHLEN]; + struct stat64 sb = { 0 }; + + (void) strlcpy(fullpath, di->dsmnt, MAXPATHLEN); + (void) strlcat(fullpath, ZDIFF_SHARESDIR, MAXPATHLEN); + + if (stat64(fullpath, &sb) != 0) { + (void) snprintf(di->errbuf, sizeof (di->errbuf), + dgettext(TEXT_DOMAIN, "Cannot stat %s"), fullpath); + return (zfs_error(di->zhp->zfs_hdl, EZFS_DIFF, di->errbuf)); + } + + di->shares = (uint64_t)sb.st_ino; + return (0); +} |