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13#include <stdio.h>
14#include <string.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18#if HAVE_ERRNO_H
19#include <errno.h>
20#endif
21#include <fcntl.h>
22#include <time.h>
23#if HAVE_SYS_STAT_H
24#include <sys/stat.h>
25#endif
26#if HAVE_SYS_TYPES_H
27#include <sys/types.h>
28#endif
29#if HAVE_SYS_IOCTL_H
30#include <sys/ioctl.h>
31#endif
32#if HAVE_NETINET_IN_H
33#include <netinet/in.h>
34#endif
35
36#include "ext2_fs.h"
37#include "../e2p/e2p.h"
38#include "../e2fsck.h"
39#include "ext2fs.h"
40#include "kernel-jbd.h"
41
42
43
44
45
46errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
47 __u32 size, int flags,
48 char **ret_jsb)
49{
50 errcode_t retval;
51 journal_superblock_t *jsb;
52
53 if (size < 1024)
54 return EXT2_ET_JOURNAL_TOO_SMALL;
55
56 if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
57 return retval;
58
59 memset (jsb, 0, fs->blocksize);
60
61 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
62 if (flags & EXT2_MKJOURNAL_V1_SUPER)
63 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1);
64 else
65 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
66 jsb->s_blocksize = htonl(fs->blocksize);
67 jsb->s_maxlen = htonl(size);
68 jsb->s_nr_users = htonl(1);
69 jsb->s_first = htonl(1);
70 jsb->s_sequence = htonl(1);
71 memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid));
72
73
74
75
76 if (fs->super->s_feature_incompat &
77 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
78 jsb->s_nr_users = 0;
79 if (fs->blocksize == 1024)
80 jsb->s_first = htonl(3);
81 else
82 jsb->s_first = htonl(2);
83 }
84
85 *ret_jsb = (char *) jsb;
86 return 0;
87}
88
89
90
91
92
93
94static errcode_t write_journal_file(ext2_filsys fs, char *filename,
95 blk_t size, int flags)
96{
97 errcode_t retval;
98 char *buf = NULL;
99 int fd, ret_size;
100 blk_t i;
101
102 if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
103 return retval;
104
105
106 if ((fd = open(filename, O_WRONLY)) < 0) {
107 retval = errno;
108 goto errout;
109 }
110
111
112 retval = EXT2_ET_SHORT_WRITE;
113 ret_size = write(fd, buf, fs->blocksize);
114 if (ret_size < 0) {
115 retval = errno;
116 goto errout;
117 }
118 if (ret_size != (int) fs->blocksize)
119 goto errout;
120 memset(buf, 0, fs->blocksize);
121
122 for (i = 1; i < size; i++) {
123 ret_size = write(fd, buf, fs->blocksize);
124 if (ret_size < 0) {
125 retval = errno;
126 goto errout;
127 }
128 if (ret_size != (int) fs->blocksize)
129 goto errout;
130 }
131 close(fd);
132
133 retval = 0;
134errout:
135 ext2fs_free_mem(&buf);
136 return retval;
137}
138
139
140
141
142struct mkjournal_struct {
143 int num_blocks;
144 int newblocks;
145 char *buf;
146 errcode_t err;
147};
148
149static int mkjournal_proc(ext2_filsys fs,
150 blk_t *blocknr,
151 e2_blkcnt_t blockcnt,
152 blk_t ref_block EXT2FS_ATTR((unused)),
153 int ref_offset EXT2FS_ATTR((unused)),
154 void *priv_data)
155{
156 struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
157 blk_t new_blk;
158 static blk_t last_blk = 0;
159 errcode_t retval;
160
161 if (*blocknr) {
162 last_blk = *blocknr;
163 return 0;
164 }
165 retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
166 if (retval) {
167 es->err = retval;
168 return BLOCK_ABORT;
169 }
170 if (blockcnt > 0)
171 es->num_blocks--;
172
173 es->newblocks++;
174 retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf);
175
176 if (blockcnt == 0)
177 memset(es->buf, 0, fs->blocksize);
178
179 if (retval) {
180 es->err = retval;
181 return BLOCK_ABORT;
182 }
183 *blocknr = new_blk;
184 last_blk = new_blk;
185 ext2fs_block_alloc_stats(fs, new_blk, +1);
186
187 if (es->num_blocks == 0)
188 return (BLOCK_CHANGED | BLOCK_ABORT);
189 else
190 return BLOCK_CHANGED;
191}
192
193
194
195
196static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
197 blk_t size, int flags)
198{
199 char *buf;
200 errcode_t retval;
201 struct ext2_inode inode;
202 struct mkjournal_struct es;
203
204 if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
205 return retval;
206
207 if ((retval = ext2fs_read_bitmaps(fs)))
208 return retval;
209
210 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
211 return retval;
212
213 if (inode.i_blocks > 0)
214 return EEXIST;
215
216 es.num_blocks = size;
217 es.newblocks = 0;
218 es.buf = buf;
219 es.err = 0;
220
221 retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
222 0, mkjournal_proc, &es);
223 if (es.err) {
224 retval = es.err;
225 goto errout;
226 }
227
228 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
229 goto errout;
230
231 inode.i_size += fs->blocksize * size;
232 inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
233 inode.i_mtime = inode.i_ctime = time(NULL);
234 inode.i_links_count = 1;
235 inode.i_mode = LINUX_S_IFREG | 0600;
236
237 if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
238 goto errout;
239 retval = 0;
240
241 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
242 fs->super->s_jnl_blocks[16] = inode.i_size;
243 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
244 ext2fs_mark_super_dirty(fs);
245
246errout:
247 ext2fs_free_mem(&buf);
248 return retval;
249}
250
251
252
253
254errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
255{
256 struct stat st;
257 errcode_t retval;
258 char buf[1024];
259 journal_superblock_t *jsb;
260 int start;
261 __u32 i, nr_users;
262
263
264 if (stat(journal_dev->device_name, &st) < 0)
265 return errno;
266
267 if (!S_ISBLK(st.st_mode))
268 return EXT2_ET_JOURNAL_NOT_BLOCK;
269
270
271 start = 1;
272 if (journal_dev->blocksize == 1024)
273 start++;
274 if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf)))
275 return retval;
276
277 jsb = (journal_superblock_t *) buf;
278 if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
279 (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2)))
280 return EXT2_ET_NO_JOURNAL_SB;
281
282 if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)
283 return EXT2_ET_UNEXPECTED_BLOCK_SIZE;
284
285
286 nr_users = ntohl(jsb->s_nr_users);
287 for (i=0; i < nr_users; i++) {
288 if (memcmp(fs->super->s_uuid,
289 &jsb->s_users[i*16], 16) == 0)
290 break;
291 }
292 if (i >= nr_users) {
293 memcpy(&jsb->s_users[nr_users*16],
294 fs->super->s_uuid, 16);
295 jsb->s_nr_users = htonl(nr_users+1);
296 }
297
298
299 if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf)))
300 return retval;
301
302 fs->super->s_journal_inum = 0;
303 fs->super->s_journal_dev = st.st_rdev;
304 memcpy(fs->super->s_journal_uuid, jsb->s_uuid,
305 sizeof(fs->super->s_journal_uuid));
306 fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
307 ext2fs_mark_super_dirty(fs);
308 return 0;
309}
310
311
312
313
314
315
316errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags)
317{
318 errcode_t retval;
319 ext2_ino_t journal_ino;
320 struct stat st;
321 char jfile[1024];
322 int fd, mount_flags, f;
323
324 retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
325 jfile, sizeof(jfile)-10);
326 if (retval)
327 return retval;
328
329 if (mount_flags & EXT2_MF_MOUNTED) {
330 strcat(jfile, "/.journal");
331
332
333
334
335
336#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
337 (void) chflags (jfile, 0);
338#else
339#if HAVE_EXT2_IOCTLS
340 fd = open(jfile, O_RDONLY);
341 if (fd >= 0) {
342 f = 0;
343 ioctl(fd, EXT2_IOC_SETFLAGS, &f);
344 close(fd);
345 }
346#endif
347#endif
348
349
350 if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
351 return errno;
352
353 if ((retval = write_journal_file(fs, jfile, size, flags)))
354 goto errout;
355
356
357 if (fstat(fd, &st) < 0)
358 goto errout;
359
360#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
361 retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);
362#else
363#if HAVE_EXT2_IOCTLS
364 f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;
365 retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
366#endif
367#endif
368 if (retval)
369 goto errout;
370
371 close(fd);
372 journal_ino = st.st_ino;
373 } else {
374 journal_ino = EXT2_JOURNAL_INO;
375 if ((retval = write_journal_inode(fs, journal_ino,
376 size, flags)))
377 return retval;
378 }
379
380 fs->super->s_journal_inum = journal_ino;
381 fs->super->s_journal_dev = 0;
382 memset(fs->super->s_journal_uuid, 0,
383 sizeof(fs->super->s_journal_uuid));
384 fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
385
386 ext2fs_mark_super_dirty(fs);
387 return 0;
388errout:
389 close(fd);
390 return retval;
391}
392
393#ifdef DEBUG
394main(int argc, char **argv)
395{
396 errcode_t retval;
397 char *device_name;
398 ext2_filsys fs;
399
400 if (argc < 2) {
401 fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
402 exit(1);
403 }
404 device_name = argv[1];
405
406 retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
407 unix_io_manager, &fs);
408 if (retval) {
409 com_err(argv[0], retval, "while opening %s", device_name);
410 exit(1);
411 }
412
413 retval = ext2fs_add_journal_inode(fs, 1024);
414 if (retval) {
415 com_err(argv[0], retval, "while adding journal to %s",
416 device_name);
417 exit(1);
418 }
419 retval = ext2fs_flush(fs);
420 if (retval) {
421 printf("Warning, had trouble writing out superblocks.\n");
422 }
423 ext2fs_close(fs);
424 exit(0);
425}
426#endif
427
