Annotation of /trunk/mkinitrd-magellan/klibc/usr/kinit/do_mounts.c
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Revision 1297 -
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Fri May 27 15:12:11 2011 UTC (12 years, 11 months ago) by niro
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File size: 5445 byte(s)
Fri May 27 15:12:11 2011 UTC (12 years, 11 months ago) by niro
File MIME type: text/plain
File size: 5445 byte(s)
-updated to klibc-1.5.22 with mntproc definitions patch included
1 | niro | 532 | #include <errno.h> |
2 | #include <fcntl.h> | ||
3 | #include <sys/mount.h> | ||
4 | #include <sys/stat.h> | ||
5 | #include <stdio.h> | ||
6 | #include <stdlib.h> | ||
7 | #include <string.h> | ||
8 | #include <unistd.h> | ||
9 | #include <inttypes.h> | ||
10 | |||
11 | #include "do_mounts.h" | ||
12 | #include "kinit.h" | ||
13 | #include "fstype.h" | ||
14 | #include "zlib.h" | ||
15 | |||
16 | /* Create the device node "name" */ | ||
17 | int create_dev(const char *name, dev_t dev) | ||
18 | { | ||
19 | unlink(name); | ||
20 | return mknod(name, S_IFBLK | 0600, dev); | ||
21 | } | ||
22 | |||
23 | /* mount a filesystem, possibly trying a set of different types */ | ||
24 | const char *mount_block(const char *source, const char *target, | ||
25 | const char *type, unsigned long flags, | ||
26 | const void *data) | ||
27 | { | ||
28 | char *fslist, *p, *ep; | ||
29 | const char *rp; | ||
30 | ssize_t fsbytes; | ||
31 | int fd; | ||
32 | |||
33 | if (type) { | ||
34 | niro | 1122 | dprintf("kinit: trying to mount %s on %s with type %s\n", |
35 | source, target, type); | ||
36 | niro | 532 | int rv = mount(source, target, type, flags, data); |
37 | /* Mount readonly if necessary */ | ||
38 | if (rv == -1 && errno == EACCES && !(flags & MS_RDONLY)) | ||
39 | rv = mount(source, target, type, flags | MS_RDONLY, | ||
40 | data); | ||
41 | return rv ? NULL : type; | ||
42 | } | ||
43 | |||
44 | /* If no type given, try to identify the type first; this | ||
45 | also takes care of specific ordering requirements, like | ||
46 | ext3 before ext2... */ | ||
47 | fd = open(source, O_RDONLY); | ||
48 | if (fd >= 0) { | ||
49 | int err = identify_fs(fd, &type, NULL, 0); | ||
50 | close(fd); | ||
51 | |||
52 | if (!err && type) { | ||
53 | niro | 1122 | dprintf("kinit: %s appears to be a %s filesystem\n", |
54 | source, type); | ||
55 | niro | 532 | type = mount_block(source, target, type, flags, data); |
56 | if (type) | ||
57 | return type; | ||
58 | } | ||
59 | } | ||
60 | |||
61 | niro | 1122 | dprintf("kinit: failed to identify filesystem %s, trying all\n", |
62 | source); | ||
63 | niro | 532 | |
64 | fsbytes = readfile("/proc/filesystems", &fslist); | ||
65 | |||
66 | errno = EINVAL; | ||
67 | if (fsbytes < 0) | ||
68 | return NULL; | ||
69 | |||
70 | p = fslist; | ||
71 | ep = fslist + fsbytes; | ||
72 | |||
73 | rp = NULL; | ||
74 | |||
75 | while (p < ep) { | ||
76 | type = p; | ||
77 | p = strchr(p, '\n'); | ||
78 | if (!p) | ||
79 | break; | ||
80 | *p++ = '\0'; | ||
81 | if (*type != '\t') /* We can't mount a block device as a "nodev" fs */ | ||
82 | continue; | ||
83 | |||
84 | type++; | ||
85 | rp = mount_block(source, target, type, flags, data); | ||
86 | if (rp) | ||
87 | break; | ||
88 | if (errno != EINVAL) | ||
89 | break; | ||
90 | } | ||
91 | |||
92 | free(fslist); | ||
93 | return rp; | ||
94 | } | ||
95 | |||
96 | /* mount the root filesystem from a block device */ | ||
97 | static int | ||
98 | mount_block_root(int argc, char *argv[], dev_t root_dev, | ||
99 | const char *type, unsigned long flags) | ||
100 | { | ||
101 | const char *data, *rp; | ||
102 | |||
103 | data = get_arg(argc, argv, "rootflags="); | ||
104 | create_dev("/dev/root", root_dev); | ||
105 | |||
106 | errno = 0; | ||
107 | |||
108 | if (type) { | ||
109 | if ((rp = mount_block("/dev/root", "/root", type, flags, data))) | ||
110 | goto ok; | ||
111 | if (errno != EINVAL) | ||
112 | goto bad; | ||
113 | } | ||
114 | |||
115 | if (!errno | ||
116 | && (rp = mount_block("/dev/root", "/root", NULL, flags, data))) | ||
117 | goto ok; | ||
118 | |||
119 | bad: | ||
120 | if (errno != EINVAL) { | ||
121 | /* | ||
122 | * Allow the user to distinguish between failed open | ||
123 | * and bad superblock on root device. | ||
124 | */ | ||
125 | fprintf(stderr, "%s: Cannot open root device %s\n", | ||
126 | progname, bdevname(root_dev)); | ||
127 | return -errno; | ||
128 | } else { | ||
129 | fprintf(stderr, "%s: Unable to mount root fs on device %s\n", | ||
130 | progname, bdevname(root_dev)); | ||
131 | return -ESRCH; | ||
132 | } | ||
133 | |||
134 | ok: | ||
135 | printf("%s: Mounted root (%s filesystem)%s.\n", | ||
136 | progname, rp, (flags & MS_RDONLY) ? " readonly" : ""); | ||
137 | return 0; | ||
138 | } | ||
139 | |||
140 | niro | 1122 | static int |
141 | mount_roots(int argc, char *argv[], const char *root_dev_name) | ||
142 | { | ||
143 | char *roots = strdup(root_dev_name); | ||
144 | char *root; | ||
145 | const char *sep = ","; | ||
146 | char *saveptr; | ||
147 | int ret = -ESRCH; | ||
148 | |||
149 | root = strtok_r(roots, sep, &saveptr); | ||
150 | while (root) { | ||
151 | dev_t root_dev; | ||
152 | |||
153 | dprintf("kinit: trying to mount %s\n", root); | ||
154 | root_dev = name_to_dev_t(root); | ||
155 | ret = mount_root(argc, argv, root_dev, root); | ||
156 | if (!ret) | ||
157 | break; | ||
158 | root = strtok_r(NULL, sep, &saveptr); | ||
159 | } | ||
160 | free(roots); | ||
161 | return ret; | ||
162 | } | ||
163 | |||
164 | niro | 532 | int |
165 | mount_root(int argc, char *argv[], dev_t root_dev, const char *root_dev_name) | ||
166 | { | ||
167 | unsigned long flags = MS_RDONLY | MS_VERBOSE; | ||
168 | int ret; | ||
169 | const char *type = get_arg(argc, argv, "rootfstype="); | ||
170 | |||
171 | if (get_flag(argc, argv, "rw") > get_flag(argc, argv, "ro")) { | ||
172 | niro | 1122 | dprintf("kinit: mounting root rw\n"); |
173 | niro | 532 | flags &= ~MS_RDONLY; |
174 | } | ||
175 | |||
176 | if (type) { | ||
177 | if (!strcmp(type, "nfs")) | ||
178 | root_dev = Root_NFS; | ||
179 | else if (!strcmp(type, "jffs2") && !major(root_dev)) | ||
180 | root_dev = Root_MTD; | ||
181 | } | ||
182 | |||
183 | switch (root_dev) { | ||
184 | case Root_NFS: | ||
185 | ret = mount_nfs_root(argc, argv, flags); | ||
186 | break; | ||
187 | case Root_MTD: | ||
188 | ret = mount_mtd_root(argc, argv, root_dev_name, type, flags); | ||
189 | break; | ||
190 | default: | ||
191 | ret = mount_block_root(argc, argv, root_dev, type, flags); | ||
192 | break; | ||
193 | } | ||
194 | |||
195 | if (!ret) | ||
196 | chdir("/root"); | ||
197 | |||
198 | return ret; | ||
199 | } | ||
200 | |||
201 | int do_mounts(int argc, char *argv[]) | ||
202 | { | ||
203 | const char *root_dev_name = get_arg(argc, argv, "root="); | ||
204 | const char *root_delay = get_arg(argc, argv, "rootdelay="); | ||
205 | const char *load_ramdisk = get_arg(argc, argv, "load_ramdisk="); | ||
206 | dev_t root_dev = 0; | ||
207 | |||
208 | niro | 1122 | dprintf("kinit: do_mounts\n"); |
209 | niro | 532 | |
210 | if (root_delay) { | ||
211 | int delay = atoi(root_delay); | ||
212 | fprintf(stderr, "Waiting %d s before mounting root device...\n", | ||
213 | delay); | ||
214 | sleep(delay); | ||
215 | } | ||
216 | |||
217 | md_run(argc, argv); | ||
218 | |||
219 | if (root_dev_name) { | ||
220 | root_dev = name_to_dev_t(root_dev_name); | ||
221 | } else if (get_arg(argc, argv, "nfsroot=") || | ||
222 | get_arg(argc, argv, "nfsaddrs=")) { | ||
223 | root_dev = Root_NFS; | ||
224 | } else { | ||
225 | long rootdev; | ||
226 | getintfile("/proc/sys/kernel/real-root-dev", &rootdev); | ||
227 | root_dev = (dev_t) rootdev; | ||
228 | } | ||
229 | |||
230 | niro | 1122 | dprintf("kinit: root_dev = %s\n", bdevname(root_dev)); |
231 | niro | 532 | |
232 | if (initrd_load(argc, argv, root_dev)) { | ||
233 | niro | 1122 | dprintf("initrd loaded\n"); |
234 | niro | 532 | return 0; |
235 | } | ||
236 | |||
237 | if (load_ramdisk && atoi(load_ramdisk)) { | ||
238 | niro | 1122 | if (ramdisk_load(argc, argv)) |
239 | niro | 532 | root_dev = Root_RAM0; |
240 | } | ||
241 | |||
242 | niro | 1122 | if (root_dev == Root_MULTI) |
243 | return mount_roots(argc, argv, root_dev_name); | ||
244 | niro | 532 | return mount_root(argc, argv, root_dev, root_dev_name); |
245 | } |