Contents of /trunk/mkinitrd-magellan/klibc/usr/kinit/do_mounts.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 4947 byte(s)
Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 4947 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | #include <ctype.h> |
2 | #include <errno.h> |
3 | #include <fcntl.h> |
4 | #include <sys/mount.h> |
5 | #include <sys/stat.h> |
6 | #include <stdio.h> |
7 | #include <stdlib.h> |
8 | #include <string.h> |
9 | #include <unistd.h> |
10 | #include <alloca.h> |
11 | #include <inttypes.h> |
12 | |
13 | #include "do_mounts.h" |
14 | #include "kinit.h" |
15 | #include "fstype.h" |
16 | #include "zlib.h" |
17 | |
18 | /* Create the device node "name" */ |
19 | int create_dev(const char *name, dev_t dev) |
20 | { |
21 | unlink(name); |
22 | return mknod(name, S_IFBLK | 0600, dev); |
23 | } |
24 | |
25 | /* mount a filesystem, possibly trying a set of different types */ |
26 | const char *mount_block(const char *source, const char *target, |
27 | const char *type, unsigned long flags, |
28 | const void *data) |
29 | { |
30 | char *fslist, *p, *ep; |
31 | const char *rp; |
32 | ssize_t fsbytes; |
33 | int fd; |
34 | |
35 | if (type) { |
36 | DEBUG(("kinit: trying to mount %s on %s with type %s\n", |
37 | source, target, type)); |
38 | int rv = mount(source, target, type, flags, data); |
39 | /* Mount readonly if necessary */ |
40 | if (rv == -1 && errno == EACCES && !(flags & MS_RDONLY)) |
41 | rv = mount(source, target, type, flags | MS_RDONLY, |
42 | data); |
43 | return rv ? NULL : type; |
44 | } |
45 | |
46 | /* If no type given, try to identify the type first; this |
47 | also takes care of specific ordering requirements, like |
48 | ext3 before ext2... */ |
49 | fd = open(source, O_RDONLY); |
50 | if (fd >= 0) { |
51 | int err = identify_fs(fd, &type, NULL, 0); |
52 | close(fd); |
53 | |
54 | if (!err && type) { |
55 | DEBUG(("kinit: %s appears to be a %s filesystem\n", |
56 | source, type)); |
57 | type = mount_block(source, target, type, flags, data); |
58 | if (type) |
59 | return type; |
60 | } |
61 | } |
62 | |
63 | DEBUG(("kinit: failed to identify filesystem %s, trying all\n", |
64 | source)); |
65 | |
66 | fsbytes = readfile("/proc/filesystems", &fslist); |
67 | |
68 | errno = EINVAL; |
69 | if (fsbytes < 0) |
70 | return NULL; |
71 | |
72 | p = fslist; |
73 | ep = fslist + fsbytes; |
74 | |
75 | rp = NULL; |
76 | |
77 | while (p < ep) { |
78 | type = p; |
79 | p = strchr(p, '\n'); |
80 | if (!p) |
81 | break; |
82 | *p++ = '\0'; |
83 | if (*type != '\t') /* We can't mount a block device as a "nodev" fs */ |
84 | continue; |
85 | |
86 | type++; |
87 | rp = mount_block(source, target, type, flags, data); |
88 | if (rp) |
89 | break; |
90 | if (errno != EINVAL) |
91 | break; |
92 | } |
93 | |
94 | free(fslist); |
95 | return rp; |
96 | } |
97 | |
98 | /* mount the root filesystem from a block device */ |
99 | static int |
100 | mount_block_root(int argc, char *argv[], dev_t root_dev, |
101 | const char *type, unsigned long flags) |
102 | { |
103 | const char *data, *rp; |
104 | |
105 | data = get_arg(argc, argv, "rootflags="); |
106 | create_dev("/dev/root", root_dev); |
107 | |
108 | errno = 0; |
109 | |
110 | if (type) { |
111 | if ((rp = mount_block("/dev/root", "/root", type, flags, data))) |
112 | goto ok; |
113 | if (errno != EINVAL) |
114 | goto bad; |
115 | } |
116 | |
117 | if (!errno |
118 | && (rp = mount_block("/dev/root", "/root", NULL, flags, data))) |
119 | goto ok; |
120 | |
121 | bad: |
122 | if (errno != EINVAL) { |
123 | /* |
124 | * Allow the user to distinguish between failed open |
125 | * and bad superblock on root device. |
126 | */ |
127 | fprintf(stderr, "%s: Cannot open root device %s\n", |
128 | progname, bdevname(root_dev)); |
129 | return -errno; |
130 | } else { |
131 | fprintf(stderr, "%s: Unable to mount root fs on device %s\n", |
132 | progname, bdevname(root_dev)); |
133 | return -ESRCH; |
134 | } |
135 | |
136 | ok: |
137 | printf("%s: Mounted root (%s filesystem)%s.\n", |
138 | progname, rp, (flags & MS_RDONLY) ? " readonly" : ""); |
139 | return 0; |
140 | } |
141 | |
142 | int |
143 | mount_root(int argc, char *argv[], dev_t root_dev, const char *root_dev_name) |
144 | { |
145 | unsigned long flags = MS_RDONLY | MS_VERBOSE; |
146 | int ret; |
147 | const char *type = get_arg(argc, argv, "rootfstype="); |
148 | |
149 | if (get_flag(argc, argv, "rw") > get_flag(argc, argv, "ro")) { |
150 | DEBUG(("kinit: mounting root rw\n")); |
151 | flags &= ~MS_RDONLY; |
152 | } |
153 | |
154 | if (type) { |
155 | if (!strcmp(type, "nfs")) |
156 | root_dev = Root_NFS; |
157 | else if (!strcmp(type, "jffs2") && !major(root_dev)) |
158 | root_dev = Root_MTD; |
159 | } |
160 | |
161 | switch (root_dev) { |
162 | case Root_NFS: |
163 | ret = mount_nfs_root(argc, argv, flags); |
164 | break; |
165 | case Root_MTD: |
166 | ret = mount_mtd_root(argc, argv, root_dev_name, type, flags); |
167 | break; |
168 | default: |
169 | ret = mount_block_root(argc, argv, root_dev, type, flags); |
170 | break; |
171 | } |
172 | |
173 | if (!ret) |
174 | chdir("/root"); |
175 | |
176 | return ret; |
177 | } |
178 | |
179 | int do_mounts(int argc, char *argv[]) |
180 | { |
181 | const char *root_dev_name = get_arg(argc, argv, "root="); |
182 | const char *root_delay = get_arg(argc, argv, "rootdelay="); |
183 | const char *load_ramdisk = get_arg(argc, argv, "load_ramdisk="); |
184 | dev_t root_dev = 0; |
185 | |
186 | DEBUG(("kinit: do_mounts\n")); |
187 | |
188 | if (root_delay) { |
189 | int delay = atoi(root_delay); |
190 | fprintf(stderr, "Waiting %d s before mounting root device...\n", |
191 | delay); |
192 | sleep(delay); |
193 | } |
194 | |
195 | md_run(argc, argv); |
196 | |
197 | if (root_dev_name) { |
198 | root_dev = name_to_dev_t(root_dev_name); |
199 | } else if (get_arg(argc, argv, "nfsroot=") || |
200 | get_arg(argc, argv, "nfsaddrs=")) { |
201 | root_dev = Root_NFS; |
202 | } else { |
203 | long rootdev; |
204 | getintfile("/proc/sys/kernel/real-root-dev", &rootdev); |
205 | root_dev = (dev_t) rootdev; |
206 | } |
207 | |
208 | DEBUG(("kinit: root_dev = %s\n", bdevname(root_dev))); |
209 | |
210 | if (initrd_load(argc, argv, root_dev)) { |
211 | DEBUG(("initrd loaded\n")); |
212 | return 0; |
213 | } |
214 | |
215 | if (load_ramdisk && atoi(load_ramdisk)) { |
216 | if (ramdisk_load(argc, argv, root_dev)) |
217 | root_dev = Root_RAM0; |
218 | } |
219 | |
220 | return mount_root(argc, argv, root_dev, root_dev_name); |
221 | } |