blob: 748d9abc70519f3ed6b5d334c0fb2ed9417f0ab3
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * mkjournal.c --- make a journal for a filesystem |
4 | * |
5 | * Copyright (C) 2000 Theodore Ts'o. |
6 | * |
7 | * %Begin-Header% |
8 | * This file may be redistributed under the terms of the GNU Public |
9 | * License. |
10 | * %End-Header% |
11 | */ |
12 | |
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 | * This function automatically sets up the journal superblock and |
44 | * returns it as an allocated block. |
45 | */ |
46 | errcode_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 | * If we're creating an external journal device, we need to |
74 | * adjust these fields. |
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 | * This function writes a journal using POSIX routines. It is used |
91 | * for creating external journals and creating journals on live |
92 | * filesystems. |
93 | */ |
94 | static 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 | /* Open the device or journal file */ |
106 | if ((fd = open(filename, O_WRONLY)) < 0) { |
107 | retval = errno; |
108 | goto errout; |
109 | } |
110 | |
111 | /* Write the superblock out */ |
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; |
134 | errout: |
135 | ext2fs_free_mem(&buf); |
136 | return retval; |
137 | } |
138 | |
139 | /* |
140 | * Helper function for creating the journal using direct I/O routines |
141 | */ |
142 | struct mkjournal_struct { |
143 | int num_blocks; |
144 | int newblocks; |
145 | char *buf; |
146 | errcode_t err; |
147 | }; |
148 | |
149 | static 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 | * This function creates a journal using direct I/O routines. |
195 | */ |
196 | static 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 | |
246 | errout: |
247 | ext2fs_free_mem(&buf); |
248 | return retval; |
249 | } |
250 | |
251 | /* |
252 | * This function adds a journal device to a filesystem |
253 | */ |
254 | errcode_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 | /* Make sure the device exists and is a block device */ |
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; /* Must be a block device */ |
269 | |
270 | /* Get the journal superblock */ |
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 | /* Check and see if this filesystem has already been added */ |
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 | /* Writeback the journal superblock */ |
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 | * This function adds a journal inode to a filesystem, using either |
313 | * POSIX routines if the filesystem is mounted, or using direct I/O |
314 | * functions if it is not. |
315 | */ |
316 | errcode_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 | * If .../.journal already exists, make sure any |
334 | * immutable or append-only flags are cleared. |
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 | /* Create the journal file */ |
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 | /* Get inode number of the journal file */ |
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; |
388 | errout: |
389 | close(fd); |
390 | return retval; |
391 | } |
392 | |
393 | #ifdef DEBUG |
394 | main(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 |