busybox/e2fsprogs/ext2fs/mkjournal.c

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/* vi: set sw=4 ts=4: */
/*
* mkjournal.c --- make a journal for a filesystem
*
* Copyright (C) 2000 Theodore Ts'o.
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*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#include <time.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include "ext2_fs.h"
#include "../e2p/e2p.h"
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#include "../e2fsck.h"
#include "ext2fs.h"
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#include "kernel-jbd.h"
/*
* This function automatically sets up the journal superblock and
* returns it as an allocated block.
*/
errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
__u32 size, int flags,
char **ret_jsb)
{
errcode_t retval;
journal_superblock_t *jsb;
if (size < 1024)
return EXT2_ET_JOURNAL_TOO_SMALL;
if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
return retval;
memset (jsb, 0, fs->blocksize);
jsb->s_header.h_magic = htonl(JFS_MAGIC_NUMBER);
if (flags & EXT2_MKJOURNAL_V1_SUPER)
jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V1);
else
jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
jsb->s_blocksize = htonl(fs->blocksize);
jsb->s_maxlen = htonl(size);
jsb->s_nr_users = htonl(1);
jsb->s_first = htonl(1);
jsb->s_sequence = htonl(1);
memcpy(jsb->s_uuid, fs->super->s_uuid, sizeof(fs->super->s_uuid));
/*
* If we're creating an external journal device, we need to
* adjust these fields.
*/
if (fs->super->s_feature_incompat &
EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
jsb->s_nr_users = 0;
if (fs->blocksize == 1024)
jsb->s_first = htonl(3);
else
jsb->s_first = htonl(2);
}
*ret_jsb = (char *) jsb;
return 0;
}
/*
* This function writes a journal using POSIX routines. It is used
* for creating external journals and creating journals on live
* filesystems.
*/
static errcode_t write_journal_file(ext2_filsys fs, char *filename,
blk_t size, int flags)
{
errcode_t retval;
char *buf = 0;
int fd, ret_size;
blk_t i;
if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
return retval;
/* Open the device or journal file */
if ((fd = open(filename, O_WRONLY)) < 0) {
retval = errno;
goto errout;
}
/* Write the superblock out */
retval = EXT2_ET_SHORT_WRITE;
ret_size = write(fd, buf, fs->blocksize);
if (ret_size < 0) {
retval = errno;
goto errout;
}
if (ret_size != (int) fs->blocksize)
goto errout;
memset(buf, 0, fs->blocksize);
for (i = 1; i < size; i++) {
ret_size = write(fd, buf, fs->blocksize);
if (ret_size < 0) {
retval = errno;
goto errout;
}
if (ret_size != (int) fs->blocksize)
goto errout;
}
close(fd);
retval = 0;
errout:
ext2fs_free_mem(&buf);
return retval;
}
/*
* Helper function for creating the journal using direct I/O routines
*/
struct mkjournal_struct {
int num_blocks;
int newblocks;
char *buf;
errcode_t err;
};
static int mkjournal_proc(ext2_filsys fs,
blk_t *blocknr,
e2_blkcnt_t blockcnt,
blk_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
blk_t new_blk;
static blk_t last_blk = 0;
errcode_t retval;
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if (*blocknr) {
last_blk = *blocknr;
return 0;
}
retval = ext2fs_new_block(fs, last_blk, 0, &new_blk);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
if (blockcnt > 0)
es->num_blocks--;
es->newblocks++;
retval = io_channel_write_blk(fs->io, new_blk, 1, es->buf);
if (blockcnt == 0)
memset(es->buf, 0, fs->blocksize);
if (retval) {
es->err = retval;
return BLOCK_ABORT;
}
*blocknr = new_blk;
last_blk = new_blk;
ext2fs_block_alloc_stats(fs, new_blk, +1);
if (es->num_blocks == 0)
return (BLOCK_CHANGED | BLOCK_ABORT);
else
return BLOCK_CHANGED;
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}
/*
* This function creates a journal using direct I/O routines.
*/
static errcode_t write_journal_inode(ext2_filsys fs, ext2_ino_t journal_ino,
blk_t size, int flags)
{
char *buf;
errcode_t retval;
struct ext2_inode inode;
struct mkjournal_struct es;
if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
return retval;
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if ((retval = ext2fs_read_bitmaps(fs)))
return retval;
if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
return retval;
if (inode.i_blocks > 0)
return EEXIST;
es.num_blocks = size;
es.newblocks = 0;
es.buf = buf;
es.err = 0;
retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
0, mkjournal_proc, &es);
if (es.err) {
retval = es.err;
goto errout;
}
if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
goto errout;
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inode.i_size += fs->blocksize * size;
inode.i_blocks += (fs->blocksize / 512) * es.newblocks;
inode.i_mtime = inode.i_ctime = time(0);
inode.i_links_count = 1;
inode.i_mode = LINUX_S_IFREG | 0600;
if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
goto errout;
retval = 0;
memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
fs->super->s_jnl_blocks[16] = inode.i_size;
fs->super->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
ext2fs_mark_super_dirty(fs);
errout:
ext2fs_free_mem(&buf);
return retval;
}
/*
* This function adds a journal device to a filesystem
*/
errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
{
struct stat st;
errcode_t retval;
char buf[1024];
journal_superblock_t *jsb;
int start;
__u32 i, nr_users;
/* Make sure the device exists and is a block device */
if (stat(journal_dev->device_name, &st) < 0)
return errno;
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if (!S_ISBLK(st.st_mode))
return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
/* Get the journal superblock */
start = 1;
if (journal_dev->blocksize == 1024)
start++;
if ((retval = io_channel_read_blk(journal_dev->io, start, -1024, buf)))
return retval;
jsb = (journal_superblock_t *) buf;
if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
(jsb->s_header.h_blocktype != (unsigned) ntohl(JFS_SUPERBLOCK_V2)))
return EXT2_ET_NO_JOURNAL_SB;
if (ntohl(jsb->s_blocksize) != (unsigned long) fs->blocksize)
return EXT2_ET_UNEXPECTED_BLOCK_SIZE;
/* Check and see if this filesystem has already been added */
nr_users = ntohl(jsb->s_nr_users);
for (i=0; i < nr_users; i++) {
if (memcmp(fs->super->s_uuid,
&jsb->s_users[i*16], 16) == 0)
break;
}
if (i >= nr_users) {
memcpy(&jsb->s_users[nr_users*16],
fs->super->s_uuid, 16);
jsb->s_nr_users = htonl(nr_users+1);
}
/* Writeback the journal superblock */
if ((retval = io_channel_write_blk(journal_dev->io, start, -1024, buf)))
return retval;
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fs->super->s_journal_inum = 0;
fs->super->s_journal_dev = st.st_rdev;
memcpy(fs->super->s_journal_uuid, jsb->s_uuid,
sizeof(fs->super->s_journal_uuid));
fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
ext2fs_mark_super_dirty(fs);
return 0;
}
/*
* This function adds a journal inode to a filesystem, using either
* POSIX routines if the filesystem is mounted, or using direct I/O
* functions if it is not.
*/
errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t size, int flags)
{
errcode_t retval;
ext2_ino_t journal_ino;
struct stat st;
char jfile[1024];
int fd, mount_flags, f;
if ((retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
jfile, sizeof(jfile)-10)))
return retval;
if (mount_flags & EXT2_MF_MOUNTED) {
strcat(jfile, "/.journal");
/*
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* If .../.journal already exists, make sure any
* immutable or append-only flags are cleared.
*/
#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
(void) chflags (jfile, 0);
#else
#if HAVE_EXT2_IOCTLS
fd = open(jfile, O_RDONLY);
if (fd >= 0) {
f = 0;
ioctl(fd, EXT2_IOC_SETFLAGS, &f);
close(fd);
}
#endif
#endif
/* Create the journal file */
if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
return errno;
if ((retval = write_journal_file(fs, jfile, size, flags)))
goto errout;
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/* Get inode number of the journal file */
if (fstat(fd, &st) < 0)
goto errout;
#if defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
retval = fchflags (fd, UF_NODUMP|UF_IMMUTABLE);
#else
#if HAVE_EXT2_IOCTLS
f = EXT2_NODUMP_FL | EXT2_IMMUTABLE_FL;
retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
#endif
#endif
if (retval)
goto errout;
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close(fd);
journal_ino = st.st_ino;
} else {
journal_ino = EXT2_JOURNAL_INO;
if ((retval = write_journal_inode(fs, journal_ino,
size, flags)))
return retval;
}
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fs->super->s_journal_inum = journal_ino;
fs->super->s_journal_dev = 0;
memset(fs->super->s_journal_uuid, 0,
sizeof(fs->super->s_journal_uuid));
fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
ext2fs_mark_super_dirty(fs);
return 0;
errout:
close(fd);
return retval;
}
#ifdef DEBUG
main(int argc, char **argv)
{
errcode_t retval;
char *device_name;
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ext2_filsys fs;
if (argc < 2) {
fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
exit(1);
}
device_name = argv[1];
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retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
unix_io_manager, &fs);
if (retval) {
com_err(argv[0], retval, "while opening %s", device_name);
exit(1);
}
retval = ext2fs_add_journal_inode(fs, 1024);
if (retval) {
com_err(argv[0], retval, "while adding journal to %s",
device_name);
exit(1);
}
retval = ext2fs_flush(fs);
if (retval) {
printf("Warning, had trouble writing out superblocks.\n");
}
ext2fs_close(fs);
exit(0);
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}
#endif