1 // SPDX-License-Identifier: GPL-2.0 !! 1
2 #include <linux/kernel.h> 2 #include <linux/kernel.h>
3 #include <linux/fs.h> 3 #include <linux/fs.h>
4 #include <linux/minix_fs.h> 4 #include <linux/minix_fs.h>
5 #include <linux/ext2_fs.h> 5 #include <linux/ext2_fs.h>
6 #include <linux/romfs_fs.h> 6 #include <linux/romfs_fs.h>
7 #include <uapi/linux/cramfs_fs.h> !! 7 #include <linux/cramfs_fs.h>
8 #include <linux/initrd.h> 8 #include <linux/initrd.h>
9 #include <linux/string.h> 9 #include <linux/string.h>
10 #include <linux/slab.h> <<
11 10
12 #include "do_mounts.h" 11 #include "do_mounts.h"
13 #include "../fs/squashfs/squashfs_fs.h" 12 #include "../fs/squashfs/squashfs_fs.h"
14 13
15 #include <linux/decompress/generic.h> 14 #include <linux/decompress/generic.h>
16 15
17 static struct file *in_file, *out_file; !! 16
18 static loff_t in_pos, out_pos; !! 17 int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
19 18
20 static int __init prompt_ramdisk(char *str) 19 static int __init prompt_ramdisk(char *str)
21 { 20 {
22 pr_warn("ignoring the deprecated promp !! 21 rd_prompt = simple_strtol(str,NULL,0) & 1;
23 return 1; 22 return 1;
24 } 23 }
25 __setup("prompt_ramdisk=", prompt_ramdisk); 24 __setup("prompt_ramdisk=", prompt_ramdisk);
26 25
27 int __initdata rd_image_start; /* sta 26 int __initdata rd_image_start; /* starting block # of image */
28 27
29 static int __init ramdisk_start_setup(char *st 28 static int __init ramdisk_start_setup(char *str)
30 { 29 {
31 rd_image_start = simple_strtol(str,NUL 30 rd_image_start = simple_strtol(str,NULL,0);
32 return 1; 31 return 1;
33 } 32 }
34 __setup("ramdisk_start=", ramdisk_start_setup) 33 __setup("ramdisk_start=", ramdisk_start_setup);
35 34
36 static int __init crd_load(decompress_fn deco) !! 35 static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
37 36
38 /* 37 /*
39 * This routine tries to find a RAM disk image 38 * This routine tries to find a RAM disk image to load, and returns the
40 * number of blocks to read for a non-compress 39 * number of blocks to read for a non-compressed image, 0 if the image
41 * is a compressed image, and -1 if an image w 40 * is a compressed image, and -1 if an image with the right magic
42 * numbers could not be found. 41 * numbers could not be found.
43 * 42 *
44 * We currently check for the following magic 43 * We currently check for the following magic numbers:
45 * minix 44 * minix
46 * ext2 45 * ext2
47 * romfs 46 * romfs
48 * cramfs 47 * cramfs
49 * squashfs 48 * squashfs
50 * gzip 49 * gzip
51 * bzip2 <<
52 * lzma <<
53 * xz <<
54 * lzo <<
55 * lz4 <<
56 */ 50 */
57 static int __init 51 static int __init
58 identify_ramdisk_image(struct file *file, loff !! 52 identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
59 decompress_fn *decompressor) <<
60 { 53 {
61 const int size = 512; 54 const int size = 512;
62 struct minix_super_block *minixsb; 55 struct minix_super_block *minixsb;
>> 56 struct ext2_super_block *ext2sb;
63 struct romfs_super_block *romfsb; 57 struct romfs_super_block *romfsb;
64 struct cramfs_super *cramfsb; 58 struct cramfs_super *cramfsb;
65 struct squashfs_super_block *squashfsb 59 struct squashfs_super_block *squashfsb;
66 int nblocks = -1; 60 int nblocks = -1;
67 unsigned char *buf; 61 unsigned char *buf;
68 const char *compress_name; 62 const char *compress_name;
69 unsigned long n; <<
70 int start_block = rd_image_start; <<
71 63
72 buf = kmalloc(size, GFP_KERNEL); 64 buf = kmalloc(size, GFP_KERNEL);
73 if (!buf) 65 if (!buf)
74 return -ENOMEM; !! 66 return -1;
75 67
76 minixsb = (struct minix_super_block *) 68 minixsb = (struct minix_super_block *) buf;
>> 69 ext2sb = (struct ext2_super_block *) buf;
77 romfsb = (struct romfs_super_block *) 70 romfsb = (struct romfs_super_block *) buf;
78 cramfsb = (struct cramfs_super *) buf; 71 cramfsb = (struct cramfs_super *) buf;
79 squashfsb = (struct squashfs_super_blo 72 squashfsb = (struct squashfs_super_block *) buf;
80 memset(buf, 0xe5, size); 73 memset(buf, 0xe5, size);
81 74
82 /* 75 /*
83 * Read block 0 to test for compressed 76 * Read block 0 to test for compressed kernel
84 */ 77 */
85 pos = start_block * BLOCK_SIZE; !! 78 sys_lseek(fd, start_block * BLOCK_SIZE, 0);
86 kernel_read(file, buf, size, &pos); !! 79 sys_read(fd, buf, size);
87 80
88 *decompressor = decompress_method(buf, 81 *decompressor = decompress_method(buf, size, &compress_name);
89 if (compress_name) { 82 if (compress_name) {
90 printk(KERN_NOTICE "RAMDISK: % 83 printk(KERN_NOTICE "RAMDISK: %s image found at block %d\n",
91 compress_name, start_bl 84 compress_name, start_block);
92 if (!*decompressor) 85 if (!*decompressor)
93 printk(KERN_EMERG 86 printk(KERN_EMERG
94 "RAMDISK: %s de 87 "RAMDISK: %s decompressor not configured!\n",
95 compress_name); 88 compress_name);
96 nblocks = 0; 89 nblocks = 0;
97 goto done; 90 goto done;
98 } 91 }
99 92
100 /* romfs is at block zero too */ 93 /* romfs is at block zero too */
101 if (romfsb->word0 == ROMSB_WORD0 && 94 if (romfsb->word0 == ROMSB_WORD0 &&
102 romfsb->word1 == ROMSB_WORD1) { 95 romfsb->word1 == ROMSB_WORD1) {
103 printk(KERN_NOTICE 96 printk(KERN_NOTICE
104 "RAMDISK: romfs filesys 97 "RAMDISK: romfs filesystem found at block %d\n",
105 start_block); 98 start_block);
106 nblocks = (ntohl(romfsb->size) 99 nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
107 goto done; 100 goto done;
108 } 101 }
109 102
110 if (cramfsb->magic == CRAMFS_MAGIC) { 103 if (cramfsb->magic == CRAMFS_MAGIC) {
111 printk(KERN_NOTICE 104 printk(KERN_NOTICE
112 "RAMDISK: cramfs filesy 105 "RAMDISK: cramfs filesystem found at block %d\n",
113 start_block); 106 start_block);
114 nblocks = (cramfsb->size + BLO 107 nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
115 goto done; 108 goto done;
116 } 109 }
117 110
118 /* squashfs is at block zero too */ 111 /* squashfs is at block zero too */
119 if (le32_to_cpu(squashfsb->s_magic) == 112 if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
120 printk(KERN_NOTICE 113 printk(KERN_NOTICE
121 "RAMDISK: squashfs file 114 "RAMDISK: squashfs filesystem found at block %d\n",
122 start_block); 115 start_block);
123 nblocks = (le64_to_cpu(squashf 116 nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
124 >> BLOCK_SIZE_BITS; 117 >> BLOCK_SIZE_BITS;
125 goto done; 118 goto done;
126 } 119 }
127 120
128 /* 121 /*
129 * Read 512 bytes further to check if <<
130 */ <<
131 pos = start_block * BLOCK_SIZE + 0x200 <<
132 kernel_read(file, buf, size, &pos); <<
133 <<
134 if (cramfsb->magic == CRAMFS_MAGIC) { <<
135 printk(KERN_NOTICE <<
136 "RAMDISK: cramfs filesy <<
137 start_block); <<
138 nblocks = (cramfsb->size + BLO <<
139 goto done; <<
140 } <<
141 <<
142 /* <<
143 * Read block 1 to test for minix and 122 * Read block 1 to test for minix and ext2 superblock
144 */ 123 */
145 pos = (start_block + 1) * BLOCK_SIZE; !! 124 sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
146 kernel_read(file, buf, size, &pos); !! 125 sys_read(fd, buf, size);
147 126
148 /* Try minix */ 127 /* Try minix */
149 if (minixsb->s_magic == MINIX_SUPER_MA 128 if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
150 minixsb->s_magic == MINIX_SUPER_MA 129 minixsb->s_magic == MINIX_SUPER_MAGIC2) {
151 printk(KERN_NOTICE 130 printk(KERN_NOTICE
152 "RAMDISK: Minix filesys 131 "RAMDISK: Minix filesystem found at block %d\n",
153 start_block); 132 start_block);
154 nblocks = minixsb->s_nzones << 133 nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
155 goto done; 134 goto done;
156 } 135 }
157 136
158 /* Try ext2 */ 137 /* Try ext2 */
159 n = ext2_image_size(buf); !! 138 if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) {
160 if (n) { <<
161 printk(KERN_NOTICE 139 printk(KERN_NOTICE
162 "RAMDISK: ext2 filesyst 140 "RAMDISK: ext2 filesystem found at block %d\n",
163 start_block); 141 start_block);
164 nblocks = n; !! 142 nblocks = le32_to_cpu(ext2sb->s_blocks_count) <<
>> 143 le32_to_cpu(ext2sb->s_log_block_size);
165 goto done; 144 goto done;
166 } 145 }
167 146
168 printk(KERN_NOTICE 147 printk(KERN_NOTICE
169 "RAMDISK: Couldn't find valid R 148 "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
170 start_block); 149 start_block);
171 150
172 done: 151 done:
>> 152 sys_lseek(fd, start_block * BLOCK_SIZE, 0);
173 kfree(buf); 153 kfree(buf);
174 return nblocks; 154 return nblocks;
175 } 155 }
176 156
177 static unsigned long nr_blocks(struct file *fi <<
178 { <<
179 struct inode *inode = file->f_mapping- <<
180 <<
181 if (!S_ISBLK(inode->i_mode)) <<
182 return 0; <<
183 return i_size_read(inode) >> 10; <<
184 } <<
185 <<
186 int __init rd_load_image(char *from) 157 int __init rd_load_image(char *from)
187 { 158 {
188 int res = 0; 159 int res = 0;
>> 160 int in_fd, out_fd;
189 unsigned long rd_blocks, devblocks; 161 unsigned long rd_blocks, devblocks;
190 int nblocks, i; !! 162 int nblocks, i, disk;
191 char *buf = NULL; 163 char *buf = NULL;
192 unsigned short rotate = 0; 164 unsigned short rotate = 0;
193 decompress_fn decompressor = NULL; 165 decompress_fn decompressor = NULL;
194 #if !defined(CONFIG_S390) !! 166 #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES)
195 char rotator[4] = { '|' , '/' , '-' , 167 char rotator[4] = { '|' , '/' , '-' , '\\' };
196 #endif 168 #endif
197 169
198 out_file = filp_open("/dev/ram", O_RDW !! 170 out_fd = sys_open("/dev/ram", O_RDWR, 0);
199 if (IS_ERR(out_file)) !! 171 if (out_fd < 0)
200 goto out; 172 goto out;
201 173
202 in_file = filp_open(from, O_RDONLY, 0) !! 174 in_fd = sys_open(from, O_RDONLY, 0);
203 if (IS_ERR(in_file)) !! 175 if (in_fd < 0)
204 goto noclose_input; 176 goto noclose_input;
205 177
206 in_pos = rd_image_start * BLOCK_SIZE; !! 178 nblocks = identify_ramdisk_image(in_fd, rd_image_start, &decompressor);
207 nblocks = identify_ramdisk_image(in_fi <<
208 if (nblocks < 0) 179 if (nblocks < 0)
209 goto done; 180 goto done;
210 181
211 if (nblocks == 0) { 182 if (nblocks == 0) {
212 if (crd_load(decompressor) == !! 183 if (crd_load(in_fd, out_fd, decompressor) == 0)
213 goto successful_load; 184 goto successful_load;
214 goto done; 185 goto done;
215 } 186 }
216 187
217 /* 188 /*
218 * NOTE NOTE: nblocks is not actually 189 * NOTE NOTE: nblocks is not actually blocks but
219 * the number of kibibytes of data to 190 * the number of kibibytes of data to load into a ramdisk.
>> 191 * So any ramdisk block size that is a multiple of 1KiB should
>> 192 * work when the appropriate ramdisk_blocksize is specified
>> 193 * on the command line.
>> 194 *
>> 195 * The default ramdisk_blocksize is 1KiB and it is generally
>> 196 * silly to use anything else, so make sure to use 1KiB
>> 197 * blocksize while generating ext2fs ramdisk-images.
220 */ 198 */
221 rd_blocks = nr_blocks(out_file); !! 199 if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
>> 200 rd_blocks = 0;
>> 201 else
>> 202 rd_blocks >>= 1;
>> 203
222 if (nblocks > rd_blocks) { 204 if (nblocks > rd_blocks) {
223 printk("RAMDISK: image too big 205 printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
224 nblocks, rd_blocks); 206 nblocks, rd_blocks);
225 goto done; 207 goto done;
226 } 208 }
227 209
228 /* 210 /*
229 * OK, time to copy in the data 211 * OK, time to copy in the data
230 */ 212 */
>> 213 if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
>> 214 devblocks = 0;
>> 215 else
>> 216 devblocks >>= 1;
>> 217
231 if (strcmp(from, "/initrd.image") == 0 218 if (strcmp(from, "/initrd.image") == 0)
232 devblocks = nblocks; 219 devblocks = nblocks;
233 else <<
234 devblocks = nr_blocks(in_file) <<
235 220
236 if (devblocks == 0) { 221 if (devblocks == 0) {
237 printk(KERN_ERR "RAMDISK: coul 222 printk(KERN_ERR "RAMDISK: could not determine device size\n");
238 goto done; 223 goto done;
239 } 224 }
240 225
241 buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); 226 buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
242 if (!buf) { 227 if (!buf) {
243 printk(KERN_ERR "RAMDISK: coul 228 printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
244 goto done; 229 goto done;
245 } 230 }
246 231
247 printk(KERN_NOTICE "RAMDISK: Loading % 232 printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
248 nblocks, ((nblocks-1)/devblock 233 nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
249 for (i = 0; i < nblocks; i++) { !! 234 for (i = 0, disk = 1; i < nblocks; i++) {
250 if (i && (i % devblocks == 0)) 235 if (i && (i % devblocks == 0)) {
251 pr_cont("done disk #1. !! 236 printk("done disk #%d.\n", disk++);
252 rotate = 0; 237 rotate = 0;
253 fput(in_file); !! 238 if (sys_close(in_fd)) {
254 break; !! 239 printk("Error closing the disk.\n");
>> 240 goto noclose_input;
>> 241 }
>> 242 change_floppy("disk #%d", disk);
>> 243 in_fd = sys_open(from, O_RDONLY, 0);
>> 244 if (in_fd < 0) {
>> 245 printk("Error opening disk.\n");
>> 246 goto noclose_input;
>> 247 }
>> 248 printk("Loading disk #%d... ", disk);
255 } 249 }
256 kernel_read(in_file, buf, BLOC !! 250 sys_read(in_fd, buf, BLOCK_SIZE);
257 kernel_write(out_file, buf, BL !! 251 sys_write(out_fd, buf, BLOCK_SIZE);
258 #if !defined(CONFIG_S390) !! 252 #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES)
259 if (!(i % 16)) { 253 if (!(i % 16)) {
260 pr_cont("%c\b", rotato !! 254 printk("%c\b", rotator[rotate & 0x3]);
261 rotate++; 255 rotate++;
262 } 256 }
263 #endif 257 #endif
264 } 258 }
265 pr_cont("done.\n"); !! 259 printk("done.\n");
266 260
267 successful_load: 261 successful_load:
268 res = 1; 262 res = 1;
269 done: 263 done:
270 fput(in_file); !! 264 sys_close(in_fd);
271 noclose_input: 265 noclose_input:
272 fput(out_file); !! 266 sys_close(out_fd);
273 out: 267 out:
274 kfree(buf); 268 kfree(buf);
275 init_unlink("/dev/ram"); !! 269 sys_unlink("/dev/ram");
276 return res; 270 return res;
277 } 271 }
278 272
279 int __init rd_load_disk(int n) 273 int __init rd_load_disk(int n)
280 { 274 {
>> 275 if (rd_prompt)
>> 276 change_floppy("root floppy disk to be loaded into RAM disk");
281 create_dev("/dev/root", ROOT_DEV); 277 create_dev("/dev/root", ROOT_DEV);
282 create_dev("/dev/ram", MKDEV(RAMDISK_M 278 create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
283 return rd_load_image("/dev/root"); 279 return rd_load_image("/dev/root");
284 } 280 }
285 281
286 static int exit_code; 282 static int exit_code;
287 static int decompress_error; 283 static int decompress_error;
>> 284 static int crd_infd, crd_outfd;
288 285
289 static long __init compr_fill(void *buf, unsig !! 286 static int __init compr_fill(void *buf, unsigned int len)
290 { 287 {
291 long r = kernel_read(in_file, buf, len !! 288 int r = sys_read(crd_infd, buf, len);
292 if (r < 0) 289 if (r < 0)
293 printk(KERN_ERR "RAMDISK: erro 290 printk(KERN_ERR "RAMDISK: error while reading compressed data");
294 else if (r == 0) 291 else if (r == 0)
295 printk(KERN_ERR "RAMDISK: EOF 292 printk(KERN_ERR "RAMDISK: EOF while reading compressed data");
296 return r; 293 return r;
297 } 294 }
298 295
299 static long __init compr_flush(void *window, u !! 296 static int __init compr_flush(void *window, unsigned int outcnt)
300 { 297 {
301 long written = kernel_write(out_file, !! 298 int written = sys_write(crd_outfd, window, outcnt);
302 if (written != outcnt) { 299 if (written != outcnt) {
303 if (decompress_error == 0) 300 if (decompress_error == 0)
304 printk(KERN_ERR 301 printk(KERN_ERR
305 "RAMDISK: incom !! 302 "RAMDISK: incomplete write (%d != %d)\n",
306 written, outcnt 303 written, outcnt);
307 decompress_error = 1; 304 decompress_error = 1;
308 return -1; 305 return -1;
309 } 306 }
310 return outcnt; 307 return outcnt;
311 } 308 }
312 309
313 static void __init error(char *x) 310 static void __init error(char *x)
314 { 311 {
315 printk(KERN_ERR "%s\n", x); 312 printk(KERN_ERR "%s\n", x);
316 exit_code = 1; 313 exit_code = 1;
317 decompress_error = 1; 314 decompress_error = 1;
318 } 315 }
319 316
320 static int __init crd_load(decompress_fn deco) !! 317 static int __init crd_load(int in_fd, int out_fd, decompress_fn deco)
321 { 318 {
322 int result; 319 int result;
323 !! 320 crd_infd = in_fd;
324 if (!deco) { !! 321 crd_outfd = out_fd;
325 pr_emerg("Invalid ramdisk deco <<
326 "Select appropriate c <<
327 panic("Could not decompress in <<
328 } <<
329 <<
330 result = deco(NULL, 0, compr_fill, com 322 result = deco(NULL, 0, compr_fill, compr_flush, NULL, NULL, error);
331 if (decompress_error) 323 if (decompress_error)
332 result = 1; 324 result = 1;
333 return result; 325 return result;
334 } 326 }
335 327
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