H Hartley Sweeten | c67e538 | 2012-05-31 16:26:10 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Many of the syscalls used in this file expect some of the arguments |
| 3 | * to be __user pointers not __kernel pointers. To limit the sparse |
| 4 | * noise, turn off sparse checking for this file. |
| 5 | */ |
| 6 | #ifdef __CHECKER__ |
| 7 | #undef __CHECKER__ |
| 8 | #warning "Sparse checking disabled for this file" |
| 9 | #endif |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/module.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/ctype.h> |
| 14 | #include <linux/fd.h> |
| 15 | #include <linux/tty.h> |
| 16 | #include <linux/suspend.h> |
| 17 | #include <linux/root_dev.h> |
| 18 | #include <linux/security.h> |
| 19 | #include <linux/delay.h> |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 20 | #include <linux/genhd.h> |
Andrew Morton | d53d9f1 | 2005-07-12 13:58:07 -0700 | [diff] [blame] | 21 | #include <linux/mount.h> |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 22 | #include <linux/device.h> |
Adrian Bunk | 4659539 | 2007-05-08 00:24:47 -0700 | [diff] [blame] | 23 | #include <linux/init.h> |
Adrian Bunk | 011e3fc | 2008-02-06 01:36:47 -0800 | [diff] [blame] | 24 | #include <linux/fs.h> |
Adrian Bunk | 82c8253 | 2008-07-25 01:45:29 -0700 | [diff] [blame] | 25 | #include <linux/initrd.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 26 | #include <linux/async.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 27 | #include <linux/fs_struct.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Rob Landley | 57f150a | 2013-09-11 14:26:10 -0700 | [diff] [blame] | 29 | #include <linux/ramfs.h> |
Rob Landley | 16203a7 | 2013-09-11 14:26:12 -0700 | [diff] [blame] | 30 | #include <linux/shmem_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <linux/nfs_fs.h> |
| 33 | #include <linux/nfs_fs_sb.h> |
| 34 | #include <linux/nfs_mount.h> |
| 35 | |
| 36 | #include "do_mounts.h" |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ |
| 39 | |
Theodore Ts'o | 9b04c99 | 2006-03-24 03:15:10 -0800 | [diff] [blame] | 40 | int root_mountflags = MS_RDONLY | MS_SILENT; |
Adrian Bunk | f56f6d30 | 2008-07-25 19:46:25 -0700 | [diff] [blame] | 41 | static char * __initdata root_device_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | static char __initdata saved_root_name[64]; |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 43 | static int root_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | dev_t ROOT_DEV; |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | static int __init load_ramdisk(char *str) |
| 48 | { |
| 49 | rd_doload = simple_strtol(str,NULL,0) & 3; |
| 50 | return 1; |
| 51 | } |
| 52 | __setup("load_ramdisk=", load_ramdisk); |
| 53 | |
| 54 | static int __init readonly(char *str) |
| 55 | { |
| 56 | if (*str) |
| 57 | return 0; |
| 58 | root_mountflags |= MS_RDONLY; |
| 59 | return 1; |
| 60 | } |
| 61 | |
| 62 | static int __init readwrite(char *str) |
| 63 | { |
| 64 | if (*str) |
| 65 | return 0; |
| 66 | root_mountflags &= ~MS_RDONLY; |
| 67 | return 1; |
| 68 | } |
| 69 | |
| 70 | __setup("ro", readonly); |
| 71 | __setup("rw", readwrite); |
| 72 | |
Jens Axboe | 6d0aed7 | 2010-09-17 10:00:46 +0200 | [diff] [blame] | 73 | #ifdef CONFIG_BLOCK |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 74 | struct uuidcmp { |
| 75 | const char *uuid; |
| 76 | int len; |
| 77 | }; |
| 78 | |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 79 | /** |
| 80 | * match_dev_by_uuid - callback for finding a partition using its uuid |
| 81 | * @dev: device passed in by the caller |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 82 | * @data: opaque pointer to the desired struct uuidcmp to match |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 83 | * |
| 84 | * Returns 1 if the device matches, and 0 otherwise. |
| 85 | */ |
Michał Mirosław | 9f3b795 | 2013-02-01 20:40:17 +0100 | [diff] [blame] | 86 | static int match_dev_by_uuid(struct device *dev, const void *data) |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 87 | { |
Michał Mirosław | 9f3b795 | 2013-02-01 20:40:17 +0100 | [diff] [blame] | 88 | const struct uuidcmp *cmp = data; |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 89 | struct hd_struct *part = dev_to_part(dev); |
| 90 | |
| 91 | if (!part->info) |
| 92 | goto no_match; |
| 93 | |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 94 | if (strncasecmp(cmp->uuid, part->info->uuid, cmp->len)) |
| 95 | goto no_match; |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 96 | |
| 97 | return 1; |
| 98 | no_match: |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | /** |
| 104 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID |
chishanmingshen | a68b310 | 2014-04-03 14:49:35 -0700 | [diff] [blame] | 105 | * @uuid_str: char array containing ascii UUID |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 106 | * |
| 107 | * The function will return the first partition which contains a matching |
| 108 | * UUID value in its partition_meta_info struct. This does not search |
| 109 | * by filesystem UUIDs. |
| 110 | * |
chishanmingshen | a68b310 | 2014-04-03 14:49:35 -0700 | [diff] [blame] | 111 | * If @uuid_str is followed by a "/PARTNROFF=%d", then the number will be |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 112 | * extracted and used as an offset from the partition identified by the UUID. |
| 113 | * |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 114 | * Returns the matching dev_t on success or 0 on failure. |
| 115 | */ |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 116 | static dev_t devt_from_partuuid(const char *uuid_str) |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 117 | { |
| 118 | dev_t res = 0; |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 119 | struct uuidcmp cmp; |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 120 | struct device *dev = NULL; |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 121 | struct gendisk *disk; |
| 122 | struct hd_struct *part; |
| 123 | int offset = 0; |
Stephen Warren | 283f8fc | 2012-11-08 16:12:27 -0800 | [diff] [blame] | 124 | bool clear_root_wait = false; |
| 125 | char *slash; |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 126 | |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 127 | cmp.uuid = uuid_str; |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 128 | |
Stephen Warren | 283f8fc | 2012-11-08 16:12:27 -0800 | [diff] [blame] | 129 | slash = strchr(uuid_str, '/'); |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 130 | /* Check for optional partition number offset attributes. */ |
Stephen Warren | 283f8fc | 2012-11-08 16:12:27 -0800 | [diff] [blame] | 131 | if (slash) { |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 132 | char c = 0; |
| 133 | /* Explicitly fail on poor PARTUUID syntax. */ |
Stephen Warren | 283f8fc | 2012-11-08 16:12:27 -0800 | [diff] [blame] | 134 | if (sscanf(slash + 1, |
| 135 | "PARTNROFF=%d%c", &offset, &c) != 1) { |
| 136 | clear_root_wait = true; |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 137 | goto done; |
| 138 | } |
Stephen Warren | 283f8fc | 2012-11-08 16:12:27 -0800 | [diff] [blame] | 139 | cmp.len = slash - uuid_str; |
| 140 | } else { |
| 141 | cmp.len = strlen(uuid_str); |
| 142 | } |
| 143 | |
| 144 | if (!cmp.len) { |
| 145 | clear_root_wait = true; |
| 146 | goto done; |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 147 | } |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 148 | |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 149 | dev = class_find_device(&block_class, NULL, &cmp, |
| 150 | &match_dev_by_uuid); |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 151 | if (!dev) |
| 152 | goto done; |
| 153 | |
| 154 | res = dev->devt; |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 155 | |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 156 | /* Attempt to find the partition by offset. */ |
| 157 | if (!offset) |
| 158 | goto no_offset; |
| 159 | |
| 160 | res = 0; |
| 161 | disk = part_to_disk(dev_to_part(dev)); |
| 162 | part = disk_get_part(disk, dev_to_part(dev)->partno + offset); |
| 163 | if (part) { |
| 164 | res = part_devt(part); |
| 165 | put_device(part_to_dev(part)); |
| 166 | } |
| 167 | |
| 168 | no_offset: |
| 169 | put_device(dev); |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 170 | done: |
Stephen Warren | 283f8fc | 2012-11-08 16:12:27 -0800 | [diff] [blame] | 171 | if (clear_root_wait) { |
| 172 | pr_err("VFS: PARTUUID= is invalid.\n" |
| 173 | "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); |
| 174 | if (root_wait) |
| 175 | pr_err("Disabling rootwait; root= is invalid.\n"); |
| 176 | root_wait = 0; |
| 177 | } |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 178 | return res; |
| 179 | } |
Jens Axboe | 6d0aed7 | 2010-09-17 10:00:46 +0200 | [diff] [blame] | 180 | #endif |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | /* |
| 183 | * Convert a name into device number. We accept the following variants: |
| 184 | * |
Pavel Machek | 0bf37ae | 2014-08-26 13:49:35 +0200 | [diff] [blame] | 185 | * 1) <hex_major><hex_minor> device number in hexadecimal represents itself |
| 186 | * no leading 0x, for example b302. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | * 2) /dev/nfs represents Root_NFS (0xff) |
| 188 | * 3) /dev/<disk_name> represents the device number of disk |
| 189 | * 4) /dev/<disk_name><decimal> represents the device number |
| 190 | * of partition - device number of disk plus the partition number |
| 191 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is |
| 192 | * used when disk name of partitioned disk ends on a digit. |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 193 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the |
| 194 | * unique id of a partition if the partition table provides it. |
Stephen Warren | d33b98f | 2012-11-08 16:12:28 -0800 | [diff] [blame] | 195 | * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS |
| 196 | * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- |
| 197 | * filled hex representation of the 32-bit "NT disk signature", and PP |
| 198 | * is a zero-filled hex representation of the 1-based partition number. |
Will Drewry | 79975f1 | 2011-11-02 13:38:59 -0700 | [diff] [blame] | 199 | * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to |
| 200 | * a partition with a known unique id. |
Sebastian Capella | 6c25161 | 2013-11-12 15:08:39 -0800 | [diff] [blame] | 201 | * 8) <major>:<minor> major and minor number of the device separated by |
| 202 | * a colon. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | * |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 204 | * If name doesn't have fall into the categories above, we return (0,0). |
| 205 | * block_class is used to check if something is a disk name. If the disk |
| 206 | * name contains slashes, the device name has them replaced with |
| 207 | * bangs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | */ |
| 209 | |
Dan Ehrenberg | e6e20a7 | 2015-02-10 15:20:49 -0800 | [diff] [blame] | 210 | dev_t name_to_dev_t(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | { |
| 212 | char s[32]; |
| 213 | char *p; |
| 214 | dev_t res = 0; |
Kay Sievers | 30f2f0e | 2008-05-06 22:31:33 +0200 | [diff] [blame] | 215 | int part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Jens Axboe | 6d0aed7 | 2010-09-17 10:00:46 +0200 | [diff] [blame] | 217 | #ifdef CONFIG_BLOCK |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 218 | if (strncmp(name, "PARTUUID=", 9) == 0) { |
| 219 | name += 9; |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 220 | res = devt_from_partuuid(name); |
| 221 | if (!res) |
| 222 | goto fail; |
| 223 | goto done; |
| 224 | } |
Jens Axboe | 6d0aed7 | 2010-09-17 10:00:46 +0200 | [diff] [blame] | 225 | #endif |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | if (strncmp(name, "/dev/", 5) != 0) { |
| 228 | unsigned maj, min; |
Dan Ehrenberg | 283e7ad | 2015-02-10 15:20:50 -0800 | [diff] [blame] | 229 | char dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Dan Ehrenberg | 283e7ad | 2015-02-10 15:20:50 -0800 | [diff] [blame] | 231 | if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | res = MKDEV(maj, min); |
| 233 | if (maj != MAJOR(res) || min != MINOR(res)) |
| 234 | goto fail; |
| 235 | } else { |
| 236 | res = new_decode_dev(simple_strtoul(name, &p, 16)); |
| 237 | if (*p) |
| 238 | goto fail; |
| 239 | } |
| 240 | goto done; |
| 241 | } |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | name += 5; |
| 244 | res = Root_NFS; |
| 245 | if (strcmp(name, "nfs") == 0) |
| 246 | goto done; |
| 247 | res = Root_RAM0; |
| 248 | if (strcmp(name, "ram") == 0) |
| 249 | goto done; |
| 250 | |
| 251 | if (strlen(name) > 31) |
| 252 | goto fail; |
| 253 | strcpy(s, name); |
| 254 | for (p = s; *p; p++) |
| 255 | if (*p == '/') |
| 256 | *p = '!'; |
Kay Sievers | 30f2f0e | 2008-05-06 22:31:33 +0200 | [diff] [blame] | 257 | res = blk_lookup_devt(s, 0); |
| 258 | if (res) |
| 259 | goto done; |
| 260 | |
| 261 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 262 | * try non-existent, but valid partition, which may only exist |
Kay Sievers | 30f2f0e | 2008-05-06 22:31:33 +0200 | [diff] [blame] | 263 | * after revalidating the disk, like partitioned md devices |
| 264 | */ |
| 265 | while (p > s && isdigit(p[-1])) |
| 266 | p--; |
| 267 | if (p == s || !*p || *p == '0') |
| 268 | goto fail; |
| 269 | |
| 270 | /* try disk name without <part number> */ |
| 271 | part = simple_strtoul(p, NULL, 10); |
| 272 | *p = '\0'; |
| 273 | res = blk_lookup_devt(s, part); |
| 274 | if (res) |
| 275 | goto done; |
| 276 | |
| 277 | /* try disk name without p<part number> */ |
| 278 | if (p < s + 2 || !isdigit(p[-2]) || p[-1] != 'p') |
| 279 | goto fail; |
| 280 | p[-1] = '\0'; |
| 281 | res = blk_lookup_devt(s, part); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (res) |
| 283 | goto done; |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | fail: |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 286 | return 0; |
| 287 | done: |
| 288 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
Dan Ehrenberg | e6e20a7 | 2015-02-10 15:20:49 -0800 | [diff] [blame] | 290 | EXPORT_SYMBOL_GPL(name_to_dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | static int __init root_dev_setup(char *line) |
| 293 | { |
| 294 | strlcpy(saved_root_name, line, sizeof(saved_root_name)); |
| 295 | return 1; |
| 296 | } |
| 297 | |
| 298 | __setup("root=", root_dev_setup); |
| 299 | |
Pierre Ossman | cc1ed75 | 2007-07-15 23:40:35 -0700 | [diff] [blame] | 300 | static int __init rootwait_setup(char *str) |
| 301 | { |
| 302 | if (*str) |
| 303 | return 0; |
| 304 | root_wait = 1; |
| 305 | return 1; |
| 306 | } |
| 307 | |
| 308 | __setup("rootwait", rootwait_setup); |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | static char * __initdata root_mount_data; |
| 311 | static int __init root_data_setup(char *str) |
| 312 | { |
| 313 | root_mount_data = str; |
| 314 | return 1; |
| 315 | } |
| 316 | |
| 317 | static char * __initdata root_fs_names; |
| 318 | static int __init fs_names_setup(char *str) |
| 319 | { |
| 320 | root_fs_names = str; |
| 321 | return 1; |
| 322 | } |
| 323 | |
| 324 | static unsigned int __initdata root_delay; |
| 325 | static int __init root_delay_setup(char *str) |
| 326 | { |
| 327 | root_delay = simple_strtoul(str, NULL, 0); |
| 328 | return 1; |
| 329 | } |
| 330 | |
| 331 | __setup("rootflags=", root_data_setup); |
| 332 | __setup("rootfstype=", fs_names_setup); |
| 333 | __setup("rootdelay=", root_delay_setup); |
| 334 | |
| 335 | static void __init get_fs_names(char *page) |
| 336 | { |
| 337 | char *s = page; |
| 338 | |
| 339 | if (root_fs_names) { |
| 340 | strcpy(page, root_fs_names); |
| 341 | while (*s++) { |
| 342 | if (s[-1] == ',') |
| 343 | s[-1] = '\0'; |
| 344 | } |
| 345 | } else { |
| 346 | int len = get_filesystem_list(page); |
| 347 | char *p, *next; |
| 348 | |
| 349 | page[len] = '\0'; |
| 350 | for (p = page-1; p; p = next) { |
| 351 | next = strchr(++p, '\n'); |
| 352 | if (*p++ != '\t') |
| 353 | continue; |
| 354 | while ((*s++ = *p++) != '\n') |
| 355 | ; |
| 356 | s[-1] = '\0'; |
| 357 | } |
| 358 | } |
| 359 | *s = '\0'; |
| 360 | } |
| 361 | |
| 362 | static int __init do_mount_root(char *name, char *fs, int flags, void *data) |
| 363 | { |
Al Viro | d8c9584 | 2011-12-07 18:16:57 -0500 | [diff] [blame] | 364 | struct super_block *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | int err = sys_mount(name, "/root", fs, flags, data); |
| 366 | if (err) |
| 367 | return err; |
| 368 | |
H Hartley Sweeten | c67e538 | 2012-05-31 16:26:10 -0700 | [diff] [blame] | 369 | sys_chdir("/root"); |
Al Viro | d8c9584 | 2011-12-07 18:16:57 -0500 | [diff] [blame] | 370 | s = current->fs->pwd.dentry->d_sb; |
| 371 | ROOT_DEV = s->s_dev; |
Mandeep Singh Baines | 80cdc6d | 2011-03-22 16:33:54 -0700 | [diff] [blame] | 372 | printk(KERN_INFO |
| 373 | "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n", |
Al Viro | d8c9584 | 2011-12-07 18:16:57 -0500 | [diff] [blame] | 374 | s->s_type->name, |
| 375 | s->s_flags & MS_RDONLY ? " readonly" : "", |
| 376 | MAJOR(ROOT_DEV), MINOR(ROOT_DEV)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | void __init mount_block_root(char *name, int flags) |
| 381 | { |
Jeff Layton | a608ca2 | 2012-10-10 15:25:26 -0400 | [diff] [blame] | 382 | struct page *page = alloc_page(GFP_KERNEL | |
| 383 | __GFP_NOTRACK_FALSE_POSITIVE); |
| 384 | char *fs_names = page_address(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | char *p; |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 386 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | char b[BDEVNAME_SIZE]; |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 388 | #else |
| 389 | const char *b = name; |
| 390 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | get_fs_names(fs_names); |
| 393 | retry: |
| 394 | for (p = fs_names; *p; p += strlen(p)+1) { |
| 395 | int err = do_mount_root(name, p, flags, root_mount_data); |
| 396 | switch (err) { |
| 397 | case 0: |
| 398 | goto out; |
| 399 | case -EACCES: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | case -EINVAL: |
| 401 | continue; |
| 402 | } |
| 403 | /* |
| 404 | * Allow the user to distinguish between failed sys_open |
| 405 | * and bad superblock on root device. |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 406 | * and give them a list of the available devices |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | */ |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 408 | #ifdef CONFIG_BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | __bdevname(ROOT_DEV, b); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 410 | #endif |
Bernhard Walle | 0e0cb89 | 2012-03-23 15:02:28 -0700 | [diff] [blame] | 411 | printk("VFS: Cannot open root device \"%s\" or %s: error %d\n", |
| 412 | root_device_name, b, err); |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 413 | printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 415 | printk_all_partitions(); |
Tejun Heo | 55dc7db | 2008-09-01 13:44:35 +0200 | [diff] [blame] | 416 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
| 417 | printk("DEBUG_BLOCK_EXT_DEVT is enabled, you need to specify " |
| 418 | "explicit textual name for \"root=\" boot option.\n"); |
| 419 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | panic("VFS: Unable to mount root fs on %s", b); |
| 421 | } |
Miklos Szeredi | 1097593 | 2014-11-20 16:08:59 +0100 | [diff] [blame] | 422 | if (!(flags & MS_RDONLY)) { |
| 423 | flags |= MS_RDONLY; |
| 424 | goto retry; |
| 425 | } |
Andy Whitcroft | be6e028b | 2006-05-15 09:44:29 -0700 | [diff] [blame] | 426 | |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 427 | printk("List of all partitions:\n"); |
| 428 | printk_all_partitions(); |
Andy Whitcroft | be6e028b | 2006-05-15 09:44:29 -0700 | [diff] [blame] | 429 | printk("No filesystem could mount root, tried: "); |
| 430 | for (p = fs_names; *p; p += strlen(p)+1) |
| 431 | printk(" %s", p); |
| 432 | printk("\n"); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 433 | #ifdef CONFIG_BLOCK |
| 434 | __bdevname(ROOT_DEV, b); |
| 435 | #endif |
| 436 | panic("VFS: Unable to mount root fs on %s", b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | out: |
Jeff Layton | a608ca2 | 2012-10-10 15:25:26 -0400 | [diff] [blame] | 438 | put_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | #ifdef CONFIG_ROOT_NFS |
Chuck Lever | 43717c7 | 2011-12-05 15:40:30 -0500 | [diff] [blame] | 442 | |
| 443 | #define NFSROOT_TIMEOUT_MIN 5 |
| 444 | #define NFSROOT_TIMEOUT_MAX 30 |
| 445 | #define NFSROOT_RETRY_MAX 5 |
| 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | static int __init mount_nfs_root(void) |
| 448 | { |
Chuck Lever | 56463e5 | 2010-09-17 10:54:37 -0400 | [diff] [blame] | 449 | char *root_dev, *root_data; |
Chuck Lever | 43717c7 | 2011-12-05 15:40:30 -0500 | [diff] [blame] | 450 | unsigned int timeout; |
| 451 | int try, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
Chuck Lever | 43717c7 | 2011-12-05 15:40:30 -0500 | [diff] [blame] | 453 | err = nfs_root_data(&root_dev, &root_data); |
| 454 | if (err != 0) |
Chuck Lever | 56463e5 | 2010-09-17 10:54:37 -0400 | [diff] [blame] | 455 | return 0; |
Chuck Lever | 43717c7 | 2011-12-05 15:40:30 -0500 | [diff] [blame] | 456 | |
| 457 | /* |
| 458 | * The server or network may not be ready, so try several |
| 459 | * times. Stop after a few tries in case the client wants |
| 460 | * to fall back to other boot methods. |
| 461 | */ |
| 462 | timeout = NFSROOT_TIMEOUT_MIN; |
| 463 | for (try = 1; ; try++) { |
| 464 | err = do_mount_root(root_dev, "nfs", |
| 465 | root_mountflags, root_data); |
| 466 | if (err == 0) |
| 467 | return 1; |
| 468 | if (try > NFSROOT_RETRY_MAX) |
| 469 | break; |
| 470 | |
| 471 | /* Wait, in case the server refused us immediately */ |
| 472 | ssleep(timeout); |
| 473 | timeout <<= 1; |
| 474 | if (timeout > NFSROOT_TIMEOUT_MAX) |
| 475 | timeout = NFSROOT_TIMEOUT_MAX; |
| 476 | } |
| 477 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | #endif |
| 480 | |
| 481 | #if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD) |
| 482 | void __init change_floppy(char *fmt, ...) |
| 483 | { |
| 484 | struct termios termios; |
| 485 | char buf[80]; |
| 486 | char c; |
| 487 | int fd; |
| 488 | va_list args; |
| 489 | va_start(args, fmt); |
| 490 | vsprintf(buf, fmt, args); |
| 491 | va_end(args); |
| 492 | fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0); |
| 493 | if (fd >= 0) { |
| 494 | sys_ioctl(fd, FDEJECT, 0); |
| 495 | sys_close(fd); |
| 496 | } |
| 497 | printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf); |
| 498 | fd = sys_open("/dev/console", O_RDWR, 0); |
| 499 | if (fd >= 0) { |
| 500 | sys_ioctl(fd, TCGETS, (long)&termios); |
| 501 | termios.c_lflag &= ~ICANON; |
| 502 | sys_ioctl(fd, TCSETSF, (long)&termios); |
| 503 | sys_read(fd, &c, 1); |
| 504 | termios.c_lflag |= ICANON; |
| 505 | sys_ioctl(fd, TCSETSF, (long)&termios); |
| 506 | sys_close(fd); |
| 507 | } |
| 508 | } |
| 509 | #endif |
| 510 | |
| 511 | void __init mount_root(void) |
| 512 | { |
| 513 | #ifdef CONFIG_ROOT_NFS |
Sasha Levin | 377485f | 2012-05-05 17:06:35 +0200 | [diff] [blame] | 514 | if (ROOT_DEV == Root_NFS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | if (mount_nfs_root()) |
| 516 | return; |
| 517 | |
| 518 | printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); |
| 519 | ROOT_DEV = Root_FD0; |
| 520 | } |
| 521 | #endif |
| 522 | #ifdef CONFIG_BLK_DEV_FD |
| 523 | if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { |
| 524 | /* rd_doload is 2 for a dual initrd/ramload setup */ |
| 525 | if (rd_doload==2) { |
| 526 | if (rd_load_disk(1)) { |
| 527 | ROOT_DEV = Root_RAM1; |
| 528 | root_device_name = NULL; |
| 529 | } |
| 530 | } else |
| 531 | change_floppy("root floppy"); |
| 532 | } |
| 533 | #endif |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 534 | #ifdef CONFIG_BLOCK |
Greg Kroah-Hartman | bdaf852 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 535 | create_dev("/dev/root", ROOT_DEV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | mount_block_root("/dev/root", root_mountflags); |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 537 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | /* |
| 541 | * Prepare the namespace - decide what/where to mount, load ramdisks, etc. |
| 542 | */ |
| 543 | void __init prepare_namespace(void) |
| 544 | { |
| 545 | int is_floppy; |
| 546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | if (root_delay) { |
Toralf Förster | ca75b4d8 | 2013-07-03 15:05:38 -0700 | [diff] [blame] | 548 | printk(KERN_INFO "Waiting %d sec before mounting root device...\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | root_delay); |
| 550 | ssleep(root_delay); |
| 551 | } |
| 552 | |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 553 | /* |
| 554 | * wait for the known devices to complete their probing |
| 555 | * |
| 556 | * Note: this is a potential source of long boot delays. |
| 557 | * For example, it is not atypical to wait 5 seconds here |
| 558 | * for the touchpad of a laptop to initialize. |
| 559 | */ |
| 560 | wait_for_device_probe(); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 561 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | md_run_setup(); |
| 563 | |
| 564 | if (saved_root_name[0]) { |
| 565 | root_device_name = saved_root_name; |
Adrian Hunter | 2d62f48 | 2008-01-31 17:25:00 +0200 | [diff] [blame] | 566 | if (!strncmp(root_device_name, "mtd", 3) || |
| 567 | !strncmp(root_device_name, "ubi", 3)) { |
Joern Engel | e9482b4 | 2006-05-30 14:25:46 +0200 | [diff] [blame] | 568 | mount_block_root(root_device_name, root_mountflags); |
| 569 | goto out; |
| 570 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | ROOT_DEV = name_to_dev_t(root_device_name); |
| 572 | if (strncmp(root_device_name, "/dev/", 5) == 0) |
| 573 | root_device_name += 5; |
| 574 | } |
| 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | if (initrd_load()) |
| 577 | goto out; |
| 578 | |
Pierre Ossman | cc1ed75 | 2007-07-15 23:40:35 -0700 | [diff] [blame] | 579 | /* wait for any asynchronous scanning to complete */ |
| 580 | if ((ROOT_DEV == 0) && root_wait) { |
| 581 | printk(KERN_INFO "Waiting for root device %s...\n", |
| 582 | saved_root_name); |
| 583 | while (driver_probe_done() != 0 || |
| 584 | (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) |
| 585 | msleep(100); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 586 | async_synchronize_full(); |
Pierre Ossman | cc1ed75 | 2007-07-15 23:40:35 -0700 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; |
| 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | if (is_floppy && rd_doload && rd_load_disk(0)) |
| 592 | ROOT_DEV = Root_RAM0; |
| 593 | |
| 594 | mount_root(); |
| 595 | out: |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 596 | devtmpfs_mount("dev"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
H Hartley Sweeten | c67e538 | 2012-05-31 16:26:10 -0700 | [diff] [blame] | 598 | sys_chroot("."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
Rob Landley | 57f150a | 2013-09-11 14:26:10 -0700 | [diff] [blame] | 600 | |
Rob Landley | 6e19ede | 2013-09-11 14:26:13 -0700 | [diff] [blame] | 601 | static bool is_tmpfs; |
Rob Landley | 57f150a | 2013-09-11 14:26:10 -0700 | [diff] [blame] | 602 | static struct dentry *rootfs_mount(struct file_system_type *fs_type, |
| 603 | int flags, const char *dev_name, void *data) |
| 604 | { |
| 605 | static unsigned long once; |
Rob Landley | 6e19ede | 2013-09-11 14:26:13 -0700 | [diff] [blame] | 606 | void *fill = ramfs_fill_super; |
Rob Landley | 57f150a | 2013-09-11 14:26:10 -0700 | [diff] [blame] | 607 | |
| 608 | if (test_and_set_bit(0, &once)) |
| 609 | return ERR_PTR(-ENODEV); |
| 610 | |
Rob Landley | 6e19ede | 2013-09-11 14:26:13 -0700 | [diff] [blame] | 611 | if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) |
| 612 | fill = shmem_fill_super; |
| 613 | |
| 614 | return mount_nodev(fs_type, flags, data, fill); |
Rob Landley | 57f150a | 2013-09-11 14:26:10 -0700 | [diff] [blame] | 615 | } |
| 616 | |
| 617 | static struct file_system_type rootfs_fs_type = { |
| 618 | .name = "rootfs", |
| 619 | .mount = rootfs_mount, |
| 620 | .kill_sb = kill_litter_super, |
| 621 | }; |
| 622 | |
| 623 | int __init init_rootfs(void) |
| 624 | { |
| 625 | int err = register_filesystem(&rootfs_fs_type); |
| 626 | |
| 627 | if (err) |
| 628 | return err; |
| 629 | |
Rob Landley | 6e19ede | 2013-09-11 14:26:13 -0700 | [diff] [blame] | 630 | if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && |
| 631 | (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { |
Rob Landley | 16203a7 | 2013-09-11 14:26:12 -0700 | [diff] [blame] | 632 | err = shmem_init(); |
Rob Landley | 6e19ede | 2013-09-11 14:26:13 -0700 | [diff] [blame] | 633 | is_tmpfs = true; |
| 634 | } else { |
Rob Landley | 16203a7 | 2013-09-11 14:26:12 -0700 | [diff] [blame] | 635 | err = init_ramfs_fs(); |
Rob Landley | 6e19ede | 2013-09-11 14:26:13 -0700 | [diff] [blame] | 636 | } |
Rob Landley | 16203a7 | 2013-09-11 14:26:12 -0700 | [diff] [blame] | 637 | |
Rob Landley | 57f150a | 2013-09-11 14:26:10 -0700 | [diff] [blame] | 638 | if (err) |
| 639 | unregister_filesystem(&rootfs_fs_type); |
| 640 | |
| 641 | return err; |
| 642 | } |