2 * mkjournal.c --- make a journal for a filesystem
4 * Copyright (C) 2000 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
26 #include <sys/types.h>
29 #include <sys/ioctl.h>
32 #include <netinet/in.h>
36 #include "../e2p/e2p.h"
37 #include "../e2fsck.h"
39 #include "kernel-jbd.h"
42 * This function automatically sets up the journal superblock and
43 * returns it as an allocated block.
45 errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
46 __u32 size, int flags,
50 journal_superblock_t *jsb;
53 return EXT2_ET_JOURNAL_TOO_SMALL;
55 if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
58 memset (jsb, 0, fs->blocksize);
60 jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
61 if (flags & EXT2_MKJOURNAL_V1_SUPER)
62 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1);
64 jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
65 jsb->s_blocksize = htonl(fs->blocksize);
66 jsb->s_maxlen = htonl(size);
67 jsb->s_nr_users = htonl(1);
68 jsb->s_first = htonl(1);
69 jsb->s_sequence = htonl(1);
70 memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid));
72 * If we're creating an external journal device, we need to
73 * adjust these fields.
75 if (fs->super->s_feature_incompat &
76 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
78 if (fs->blocksize == 1024)
79 jsb->s_first = htonl(3);
81 jsb->s_first = htonl(2);
84 *ret_jsb = (char *) jsb;
89 * This function writes a journal using POSIX routines. It is used
90 * for creating external journals and creating journals on live
93 static errcode_t write_journal_file(ext2_filsys fs, char *filename,
94 blk_t size, int flags)
101 if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
104 /* Open the device or journal file */
105 if ((fd = open(filename, O_WRONLY)) < 0) {
110 /* Write the superblock out */
111 retval = EXT2_ET_SHORT_WRITE;
112 ret_size = write(fd, buf, fs->blocksize);
117 if (ret_size != (int) fs->blocksize)
119 memset(buf, 0, fs->blocksize);
121 for (i = 1; i < size; i++) {
122 ret_size = write(fd, buf, fs->blocksize);
127 if (ret_size != (int) fs->blocksize)
134 ext2fs_free_mem(&buf);
139 * Helper function for creating the journal using direct I/O routines
141 struct mkjournal_struct {
148 static int mkjournal_proc(ext2_filsys fs,
150 e2_blkcnt_t blockcnt,
151 blk_t ref_block EXT2FS_ATTR((unused)),
152 int ref_offset EXT2FS_ATTR((unused)),
155 struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
157 static blk_t last_blk = 0;
164 retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
173 retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf);
176 memset(es->buf, 0, fs->blocksize);
184 ext2fs_block_alloc_stats(fs, new_blk, +1);
186 if (es->num_blocks == 0)
187 return (BLOCK_CHANGED | BLOCK_ABORT);
189 return BLOCK_CHANGED;
194 * This function creates a journal using direct I/O routines.
196 static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
197 blk_t size, int flags)
201 struct ext2_inode inode;
202 struct mkjournal_struct es;
204 if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
207 if ((retval = ext2fs_read_bitmaps(fs)))
210 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
213 if (inode.i_blocks > 0)
216 es.num_blocks = size;
221 retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
222 0, mkjournal_proc, &es);
228 if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
231 inode.i_size += fs->blocksize * size;
232 inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
233 inode.i_mtime = inode.i_ctime = time(0);
234 inode.i_links_count = 1;
235 inode.i_mode = LINUX_S_IFREG | 0600;
237 if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
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);
247 ext2fs_free_mem(&buf);
252 * This function adds a journal device to a filesystem
254 errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
259 journal_superblock_t *jsb;
263 /* Make sure the device exists and is a block device */
264 if (stat(journal_dev->device_name, &st) < 0)
267 if (!S_ISBLK(st.st_mode))
268 return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
270 /* Get the journal superblock */
272 if (journal_dev->blocksize == 1024)
274 if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf)))
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;
282 if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)
283 return EXT2_ET_UNEXPECTED_BLOCK_SIZE;
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)
293 memcpy(&jsb->s_users[nr_users*16],
294 fs->super->s_uuid, 16);
295 jsb->s_nr_users = htonl(nr_users+1);
298 /* Writeback the journal superblock */
299 if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf)))
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);
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.
316 errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags)
319 ext2_ino_t journal_ino;
322 int fd, mount_flags, f;
324 if ((retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
325 jfile, sizeof(jfile)-10)))
328 if (mount_flags & EXT2_MF_MOUNTED) {
329 strcat(jfile, "/.journal");
332 * If .../.journal already exists, make sure any
333 * immutable or append-only flags are cleared.
335 #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
336 (void) chflags (jfile, 0);
339 fd = open(jfile, O_RDONLY);
342 ioctl(fd, EXT2_IOC_SETFLAGS, &f);
348 /* Create the journal file */
349 if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
352 if ((retval = write_journal_file(fs, jfile, size, flags)))
355 /* Get inode number of the journal file */
356 if (fstat(fd, &st) < 0)
359 #if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
360 retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);
363 f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;
364 retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
371 journal_ino = st.st_ino;
373 journal_ino = EXT2_JOURNAL_INO;
374 if ((retval = write_journal_inode(fs, journal_ino,
379 fs->super->s_journal_inum = journal_ino;
380 fs->super->s_journal_dev = 0;
381 memset(fs->super->s_journal_uuid, 0,
382 sizeof(fs->super->s_journal_uuid));
383 fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
385 ext2fs_mark_super_dirty(fs);
393 main(int argc, char **argv)
400 fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
403 device_name = argv[1];
405 retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
406 unix_io_manager, &fs);
408 com_err(argv[0], retval, "while opening %s", device_name);
412 retval = ext2fs_add_journal_inode(fs, 1024);
414 com_err(argv[0], retval, "while adding journal to %s",
418 retval = ext2fs_flush(fs);
420 printf("Warning, had trouble writing out superblocks.\n");