1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in> 5 * Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "be.h" 34 #include "be_impl.h" 35 36 struct be_mountcheck_info { 37 const char *path; 38 char *name; 39 }; 40 41 static int 42 be_mountcheck_cb(zfs_handle_t *zfs_hdl, void *data) 43 { 44 struct be_mountcheck_info *info; 45 char *mountpoint; 46 47 if (data == NULL) 48 return (1); 49 info = (struct be_mountcheck_info *)data; 50 if (!zfs_is_mounted(zfs_hdl, &mountpoint)) 51 return (0); 52 if (strcmp(mountpoint, info->path) == 0) { 53 info->name = strdup(zfs_get_name(zfs_hdl)); 54 free(mountpoint); 55 return (1); 56 } 57 free(mountpoint); 58 return (0); 59 } 60 61 /* 62 * usage 63 */ 64 int 65 be_mounted_at(libbe_handle_t *lbh, const char *path, nvlist_t *details) 66 { 67 char be[BE_MAXPATHLEN + 1]; 68 zfs_handle_t *root_hdl; 69 struct be_mountcheck_info info; 70 prop_data_t propinfo; 71 72 bzero(&be, BE_MAXPATHLEN + 1); 73 if ((root_hdl = zfs_open(lbh->lzh, lbh->root, 74 ZFS_TYPE_FILESYSTEM)) == NULL) 75 return (BE_ERR_ZFSOPEN); 76 77 info.path = path; 78 info.name = NULL; 79 zfs_iter_filesystems(root_hdl, be_mountcheck_cb, &info); 80 zfs_close(root_hdl); 81 82 if (info.name != NULL) { 83 if (details != NULL) { 84 if ((root_hdl = zfs_open(lbh->lzh, lbh->root, 85 ZFS_TYPE_FILESYSTEM)) == NULL) { 86 free(info.name); 87 return (BE_ERR_ZFSOPEN); 88 } 89 90 propinfo.lbh = lbh; 91 propinfo.list = details; 92 propinfo.single_object = false; 93 prop_list_builder_cb(root_hdl, &propinfo); 94 zfs_close(root_hdl); 95 } 96 free(info.name); 97 return (0); 98 } 99 return (1); 100 } 101 102 /* 103 * usage 104 */ 105 int 106 be_mount(libbe_handle_t *lbh, char *bootenv, char *mountpoint, int flags, 107 char *result_loc) 108 { 109 char be[BE_MAXPATHLEN]; 110 char mnt_temp[BE_MAXPATHLEN]; 111 int mntflags; 112 int err; 113 114 if ((err = be_root_concat(lbh, bootenv, be)) != 0) 115 return (set_error(lbh, err)); 116 117 if (!be_exists(lbh, bootenv)) 118 return (set_error(lbh, BE_ERR_NOENT)); 119 120 if (is_mounted(lbh->lzh, be, NULL)) 121 return (set_error(lbh, BE_ERR_MOUNTED)); 122 123 mntflags = (flags & BE_MNT_FORCE) ? MNT_FORCE : 0; 124 125 /* Create mountpoint if it is not specified */ 126 if (mountpoint == NULL) { 127 strcpy(mnt_temp, "/tmp/be_mount.XXXX"); 128 if (mkdtemp(mnt_temp) == NULL) 129 return (set_error(lbh, BE_ERR_IO)); 130 } 131 132 char opt = '\0'; 133 if ((err = zmount(be, (mountpoint == NULL) ? mnt_temp : mountpoint, 134 mntflags, __DECONST(char *, MNTTYPE_ZFS), NULL, 0, &opt, 1)) != 0) { 135 switch (errno) { 136 case ENAMETOOLONG: 137 return (set_error(lbh, BE_ERR_PATHLEN)); 138 case ELOOP: 139 case ENOENT: 140 case ENOTDIR: 141 return (set_error(lbh, BE_ERR_BADPATH)); 142 case EPERM: 143 return (set_error(lbh, BE_ERR_PERMS)); 144 case EBUSY: 145 return (set_error(lbh, BE_ERR_PATHBUSY)); 146 default: 147 return (set_error(lbh, BE_ERR_UNKNOWN)); 148 } 149 } 150 151 if (result_loc != NULL) 152 strcpy(result_loc, mountpoint == NULL ? mnt_temp : mountpoint); 153 154 return (BE_ERR_SUCCESS); 155 } 156 157 158 /* 159 * usage 160 */ 161 int 162 be_unmount(libbe_handle_t *lbh, char *bootenv, int flags) 163 { 164 int err, mntflags; 165 char be[BE_MAXPATHLEN]; 166 struct statfs *mntbuf; 167 int mntsize; 168 char *mntpath; 169 170 if ((err = be_root_concat(lbh, bootenv, be)) != 0) 171 return (set_error(lbh, err)); 172 173 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 174 if (errno == EIO) 175 return (set_error(lbh, BE_ERR_IO)); 176 return (set_error(lbh, BE_ERR_NOMOUNT)); 177 } 178 179 mntpath = NULL; 180 for (int i = 0; i < mntsize; ++i) { 181 /* 0x000000de is the type number of zfs */ 182 if (mntbuf[i].f_type != 0x000000de) 183 continue; 184 185 if (strcmp(mntbuf[i].f_mntfromname, be) == 0) { 186 mntpath = mntbuf[i].f_mntonname; 187 break; 188 } 189 } 190 191 if (mntpath == NULL) 192 return (set_error(lbh, BE_ERR_NOMOUNT)); 193 194 mntflags = (flags & BE_MNT_FORCE) ? MNT_FORCE : 0; 195 196 if ((err = unmount(mntpath, mntflags)) != 0) { 197 switch (errno) { 198 case ENAMETOOLONG: 199 return (set_error(lbh, BE_ERR_PATHLEN)); 200 case ELOOP: 201 case ENOENT: 202 case ENOTDIR: 203 return (set_error(lbh, BE_ERR_BADPATH)); 204 case EPERM: 205 return (set_error(lbh, BE_ERR_PERMS)); 206 case EBUSY: 207 return (set_error(lbh, BE_ERR_PATHBUSY)); 208 default: 209 return (set_error(lbh, BE_ERR_UNKNOWN)); 210 } 211 } 212 213 return (set_error(lbh, BE_ERR_SUCCESS)); 214 } 215