source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/ext2fs/mkjournal.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 9.6 KB
Line 
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 */
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 * 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 */
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 = 0;
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;
134errout:
135 ext2fs_free_mem(&buf);
136 return retval;
137}
138
139/*
140 * Helper function for creating the journal using direct I/O routines
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 * This function creates a journal using direct I/O routines.
196 */
197static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
198 blk_t size, int flags)
199{
200 char *buf;
201 errcode_t retval;
202 struct ext2_inode inode;
203 struct mkjournal_struct es;
204
205 if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
206 return retval;
207
208 if ((retval = ext2fs_read_bitmaps(fs)))
209 return retval;
210
211 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
212 return retval;
213
214 if (inode.i_blocks > 0)
215 return EEXIST;
216
217 es.num_blocks = size;
218 es.newblocks = 0;
219 es.buf = buf;
220 es.err = 0;
221
222 retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
223 0, mkjournal_proc, &es);
224 if (es.err) {
225 retval = es.err;
226 goto errout;
227 }
228
229 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
230 goto errout;
231
232 inode.i_size += fs->blocksize * size;
233 inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
234 inode.i_mtime = inode.i_ctime = time(0);
235 inode.i_links_count = 1;
236 inode.i_mode = LINUX_S_IFREG | 0600;
237
238 if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
239 goto errout;
240 retval = 0;
241
242 memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
243 fs->super->s_jnl_blocks[16] = inode.i_size;
244 fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
245 ext2fs_mark_super_dirty(fs);
246
247errout:
248 ext2fs_free_mem(&buf);
249 return retval;
250}
251
252/*
253 * This function adds a journal device to a filesystem
254 */
255errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
256{
257 struct stat st;
258 errcode_t retval;
259 char buf[1024];
260 journal_superblock_t *jsb;
261 int start;
262 __u32 i, nr_users;
263
264 /* Make sure the device exists and is a block device */
265 if (stat(journal_dev->device_name, &st) < 0)
266 return errno;
267
268 if (!S_ISBLK(st.st_mode))
269 return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
270
271 /* Get the journal superblock */
272 start = 1;
273 if (journal_dev->blocksize == 1024)
274 start++;
275 if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf)))
276 return retval;
277
278 jsb = (journal_superblock_t *) buf;
279 if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
280 (jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2)))
281 return EXT2_ET_NO_JOURNAL_SB;
282
283 if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)
284 return EXT2_ET_UNEXPECTED_BLOCK_SIZE;
285
286 /* Check and see if this filesystem has already been added */
287 nr_users = ntohl(jsb->s_nr_users);
288 for (i=0; i < nr_users; i++) {
289 if (memcmp(fs->super->s_uuid,
290 &jsb->s_users[i*16], 16) == 0)
291 break;
292 }
293 if (i >= nr_users) {
294 memcpy(&jsb->s_users[nr_users*16],
295 fs->super->s_uuid, 16);
296 jsb->s_nr_users = htonl(nr_users+1);
297 }
298
299 /* Writeback the journal superblock */
300 if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf)))
301 return retval;
302
303 fs->super->s_journal_inum = 0;
304 fs->super->s_journal_dev = st.st_rdev;
305 memcpy(fs->super->s_journal_uuid, jsb->s_uuid,
306 sizeof(fs->super->s_journal_uuid));
307 fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
308 ext2fs_mark_super_dirty(fs);
309 return 0;
310}
311
312/*
313 * This function adds a journal inode to a filesystem, using either
314 * POSIX routines if the filesystem is mounted, or using direct I/O
315 * functions if it is not.
316 */
317errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags)
318{
319 errcode_t retval;
320 ext2_ino_t journal_ino;
321 struct stat st;
322 char jfile[1024];
323 int fd, mount_flags, f;
324
325 retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
326 jfile, sizeof(jfile)-10);
327 if (retval)
328 return retval;
329
330 if (mount_flags & EXT2_MF_MOUNTED) {
331 strcat(jfile, "/.journal");
332
333 /*
334 * If .../.journal already exists, make sure any
335 * immutable or append-only flags are cleared.
336 */
337#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
338 (void) chflags (jfile, 0);
339#else
340#if HAVE_EXT2_IOCTLS
341 fd = open(jfile, O_RDONLY);
342 if (fd >= 0) {
343 f = 0;
344 ioctl(fd, EXT2_IOC_SETFLAGS, &f);
345 close(fd);
346 }
347#endif
348#endif
349
350 /* Create the journal file */
351 if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
352 return errno;
353
354 if ((retval = write_journal_file(fs, jfile, size, flags)))
355 goto errout;
356
357 /* Get inode number of the journal file */
358 if (fstat(fd, &st) < 0)
359 goto errout;
360
361#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
362 retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);
363#else
364#if HAVE_EXT2_IOCTLS
365 f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;
366 retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
367#endif
368#endif
369 if (retval)
370 goto errout;
371
372 close(fd);
373 journal_ino = st.st_ino;
374 } else {
375 journal_ino = EXT2_JOURNAL_INO;
376 if ((retval = write_journal_inode(fs, journal_ino,
377 size, flags)))
378 return retval;
379 }
380
381 fs->super->s_journal_inum = journal_ino;
382 fs->super->s_journal_dev = 0;
383 memset(fs->super->s_journal_uuid, 0,
384 sizeof(fs->super->s_journal_uuid));
385 fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
386
387 ext2fs_mark_super_dirty(fs);
388 return 0;
389errout:
390 close(fd);
391 return retval;
392}
393
394#ifdef DEBUG
395main(int argc, char **argv)
396{
397 errcode_t retval;
398 char *device_name;
399 ext2_filsys fs;
400
401 if (argc < 2) {
402 fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
403 exit(1);
404 }
405 device_name = argv[1];
406
407 retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
408 unix_io_manager, &fs);
409 if (retval) {
410 com_err(argv[0], retval, "while opening %s", device_name);
411 exit(1);
412 }
413
414 retval = ext2fs_add_journal_inode(fs, 1024);
415 if (retval) {
416 com_err(argv[0], retval, "while adding journal to %s",
417 device_name);
418 exit(1);
419 }
420 retval = ext2fs_flush(fs);
421 if (retval) {
422 printf("Warning, had trouble writing out superblocks.\n");
423 }
424 ext2fs_close(fs);
425 exit(0);
426
427}
428#endif
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