Contents 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 | #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 | dprintf("kinit: trying to mount %s on %s with type %s\n", |
35 | source, target, type); |
36 | 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 | dprintf("kinit: %s appears to be a %s filesystem\n", |
54 | source, type); |
55 | type = mount_block(source, target, type, flags, data); |
56 | if (type) |
57 | return type; |
58 | } |
59 | } |
60 | |
61 | dprintf("kinit: failed to identify filesystem %s, trying all\n", |
62 | source); |
63 | |
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 | 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 | 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 | dprintf("kinit: mounting root rw\n"); |
173 | 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 | dprintf("kinit: do_mounts\n"); |
209 | |
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 | dprintf("kinit: root_dev = %s\n", bdevname(root_dev)); |
231 | |
232 | if (initrd_load(argc, argv, root_dev)) { |
233 | dprintf("initrd loaded\n"); |
234 | return 0; |
235 | } |
236 | |
237 | if (load_ramdisk && atoi(load_ramdisk)) { |
238 | if (ramdisk_load(argc, argv)) |
239 | root_dev = Root_RAM0; |
240 | } |
241 | |
242 | if (root_dev == Root_MULTI) |
243 | return mount_roots(argc, argv, root_dev_name); |
244 | return mount_root(argc, argv, root_dev, root_dev_name); |
245 | } |