* Copyright (C) 2000 Theodore Ts'o.
*
* %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
* %End-Header%
*/
+#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include "ext2_fs.h"
#include "e2p/e2p.h"
#include "ext2fs.h"
-#include "jfs_user.h"
+
+#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,
+ __u32 num_blocks, int flags,
char **ret_jsb)
{
errcode_t retval;
journal_superblock_t *jsb;
- if (size < 1024)
+ if (num_blocks < JFS_MIN_JOURNAL_BLOCKS)
return EXT2_ET_JOURNAL_TOO_SMALL;
if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
else
jsb->s_header.h_blocktype = htonl(JFS_SUPERBLOCK_V2);
jsb->s_blocksize = htonl(fs->blocksize);
- jsb->s_maxlen = htonl(size);
+ jsb->s_maxlen = htonl(num_blocks);
jsb->s_nr_users = htonl(1);
jsb->s_first = htonl(1);
jsb->s_sequence = htonl(1);
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);
+ jsb->s_first = htonl(ext2fs_journal_sb_start(fs->blocksize) + 1);
}
*ret_jsb = (char *) jsb;
* filesystems.
*/
static errcode_t write_journal_file(ext2_filsys fs, char *filename,
- blk_t size, int flags)
+ blk_t num_blocks, 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)))
+ if ((retval = ext2fs_create_journal_superblock(fs, num_blocks, flags,
+ &buf)))
return retval;
/* Open the device or journal file */
if ((fd = open(filename, O_WRONLY)) < 0) {
retval = errno;
- goto errout;
+ goto errfree;
}
/* Write the superblock out */
goto errout;
memset(buf, 0, fs->blocksize);
- for (i = 1; i < size; i++) {
+ if (flags & EXT2_MKJOURNAL_LAZYINIT)
+ goto success;
+
+ for (i = 1; i < num_blocks; i++) {
ret_size = write(fd, buf, fs->blocksize);
if (ret_size < 0) {
retval = errno;
if (ret_size != (int) fs->blocksize)
goto errout;
}
- close(fd);
+success:
retval = 0;
errout:
+ close(fd);
+errfree:
ext2fs_free_mem(&buf);
return retval;
}
* attempt to free the static zeroizing buffer. (This is to keep
* programs that check for memory leaks happy.)
*/
-#define STRIDE_LENGTH 8
+#define MAX_STRIDE_LENGTH (4194304 / (int) fs->blocksize)
errcode_t ext2fs_zero_blocks2(ext2_filsys fs, blk64_t blk, int num,
blk64_t *ret_blk, int *ret_count)
{
int j, count;
- static char *buf;
+ static void *buf;
+ static int stride_length;
errcode_t retval;
/* If fs is null, clean up the static buffer and return */
}
return 0;
}
+
+ /* Deal with zeroing less than 1 block */
+ if (num <= 0)
+ return 0;
+
+ /* Try a zero out command, if supported */
+ retval = io_channel_zeroout(fs->io, blk, num);
+ if (retval == 0)
+ return 0;
+
/* Allocate the zeroizing buffer if necessary */
- if (!buf) {
- buf = malloc(fs->blocksize * STRIDE_LENGTH);
- if (!buf)
- return ENOMEM;
- memset(buf, 0, fs->blocksize * STRIDE_LENGTH);
+ if (num > stride_length && stride_length < MAX_STRIDE_LENGTH) {
+ void *p;
+ int new_stride = num;
+
+ if (new_stride > MAX_STRIDE_LENGTH)
+ new_stride = MAX_STRIDE_LENGTH;
+ p = realloc(buf, fs->blocksize * new_stride);
+ if (!p)
+ return EXT2_ET_NO_MEMORY;
+ buf = p;
+ stride_length = new_stride;
+ memset(buf, 0, fs->blocksize * stride_length);
}
/* OK, do the write loop */
j=0;
while (j < num) {
- if (blk % STRIDE_LENGTH) {
- count = STRIDE_LENGTH - (blk % STRIDE_LENGTH);
+ if (blk % stride_length) {
+ count = stride_length - (blk % stride_length);
if (count > (num - j))
count = num - j;
} else {
count = num - j;
- if (count > STRIDE_LENGTH)
- count = STRIDE_LENGTH;
+ if (count > stride_length)
+ count = stride_length;
}
retval = io_channel_write_blk64(fs->io, blk, count, buf);
if (retval) {
}
/*
- * Helper function for creating the journal using direct I/O routines
+ * Calculate the initial goal block to be roughly at the middle of the
+ * filesystem. Pick a group that has the largest number of free
+ * blocks.
*/
-struct mkjournal_struct {
- int num_blocks;
- int newblocks;
- blk_t goal;
- blk_t blk_to_zero;
- int zero_count;
- 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)
+static blk64_t get_midpoint_journal_block(ext2_filsys fs)
{
- struct mkjournal_struct *es = (struct mkjournal_struct *) priv_data;
- blk_t new_blk;
- errcode_t retval;
-
- if (*blocknr) {
- es->goal = *blocknr;
- return 0;
- }
- retval = ext2fs_new_block(fs, es->goal, 0, &new_blk);
- if (retval) {
- es->err = retval;
- return BLOCK_ABORT;
- }
- if (blockcnt >= 0)
- es->num_blocks--;
-
- es->newblocks++;
- retval = 0;
- if (blockcnt <= 0)
- retval = io_channel_write_blk64(fs->io, new_blk, 1, es->buf);
- else {
- if (es->zero_count) {
- if ((es->blk_to_zero + es->zero_count == new_blk) &&
- (es->zero_count < 1024))
- es->zero_count++;
- else {
- retval = ext2fs_zero_blocks(fs,
- es->blk_to_zero,
- es->zero_count,
- 0, 0);
- es->zero_count = 0;
- }
- }
- if (es->zero_count == 0) {
- es->blk_to_zero = new_blk;
- es->zero_count = 1;
- }
- }
-
- if (blockcnt == 0)
- memset(es->buf, 0, fs->blocksize);
-
- if (retval) {
- es->err = retval;
- return BLOCK_ABORT;
- }
- *blocknr = es->goal = new_blk;
- ext2fs_block_alloc_stats2(fs, new_blk, +1);
+ dgrp_t group, start, end, i, log_flex;
- if (es->num_blocks == 0)
- return (BLOCK_CHANGED | BLOCK_ABORT);
- else
- return BLOCK_CHANGED;
-
-}
-
-/*
- * 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;
- dgrp_t group, start, end, i, log_flex;
- errcode_t retval;
- struct ext2_inode inode;
- struct mkjournal_struct es;
-
- if ((retval = ext2fs_create_journal_superblock(fs, size, flags, &buf)))
- return retval;
-
- 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;
- es.zero_count = 0;
-
- if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
- inode.i_flags |= EXT4_EXTENTS_FL;
- if ((retval = ext2fs_write_inode(fs, journal_ino, &inode)))
- return retval;
- }
-
- /*
- * Set the initial goal block to be roughly at the middle of
- * the filesystem. Pick a group that has the largest number
- * of free blocks.
- */
group = ext2fs_group_of_blk2(fs, (ext2fs_blocks_count(fs->super) -
fs->super->s_first_data_block) / 2);
log_flex = 1 << fs->super->s_log_groups_per_flex;
start = (group > 0) ? group-1 : group;
end = ((group+1) < fs->group_desc_count) ? group+1 : group;
group = start;
- for (i=start+1; i <= end; i++)
+ for (i = start + 1; i <= end; i++)
if (ext2fs_bg_free_blocks_count(fs, i) >
ext2fs_bg_free_blocks_count(fs, group))
group = i;
+ return ext2fs_group_first_block2(fs, group);
+}
+
+/*
+ * 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 num_blocks, blk64_t goal, int flags)
+{
+ char *buf;
+ errcode_t retval;
+ struct ext2_inode inode;
+ unsigned long long inode_size;
+ int falloc_flags = EXT2_FALLOCATE_FORCE_INIT;
+ blk64_t zblk;
- es.goal = (fs->super->s_blocks_per_group * group) +
- fs->super->s_first_data_block;
+ if ((retval = ext2fs_create_journal_superblock(fs, num_blocks, flags,
+ &buf)))
+ return retval;
- retval = ext2fs_block_iterate2(fs, journal_ino, BLOCK_FLAG_APPEND,
- 0, mkjournal_proc, &es);
- if (es.err) {
- retval = es.err;
- goto errout;
- }
- if (es.zero_count) {
- retval = ext2fs_zero_blocks(fs, es.blk_to_zero,
- es.zero_count, 0, 0);
- if (retval)
- goto errout;
- }
+ if ((retval = ext2fs_read_bitmaps(fs)))
+ goto out2;
if ((retval = ext2fs_read_inode(fs, journal_ino, &inode)))
- goto errout;
+ goto out2;
+
+ if (inode.i_blocks > 0) {
+ retval = EEXIST;
+ goto out2;
+ }
- inode.i_size += fs->blocksize * size;
- ext2fs_iblk_add_blocks(fs, &inode, es.newblocks);
+ if (goal == ~0ULL)
+ goal = get_midpoint_journal_block(fs);
+
+ if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
+ inode.i_flags |= EXT4_EXTENTS_FL;
+
+ if (!(flags & EXT2_MKJOURNAL_LAZYINIT))
+ falloc_flags |= EXT2_FALLOCATE_ZERO_BLOCKS;
+
+ inode_size = (unsigned long long)fs->blocksize * num_blocks;
inode.i_mtime = inode.i_ctime = fs->now ? fs->now : time(0);
inode.i_links_count = 1;
inode.i_mode = LINUX_S_IFREG | 0600;
+ retval = ext2fs_inode_size_set(fs, &inode, inode_size);
+ if (retval)
+ goto out2;
+
+ retval = ext2fs_fallocate(fs, falloc_flags, journal_ino,
+ &inode, goal, 0, num_blocks);
+ if (retval)
+ goto out2;
if ((retval = ext2fs_write_new_inode(fs, journal_ino, &inode)))
- goto errout;
- retval = 0;
+ goto out2;
+
+ retval = ext2fs_bmap2(fs, journal_ino, &inode, NULL, 0, 0, NULL, &zblk);
+ if (retval)
+ goto out2;
+
+ retval = io_channel_write_blk64(fs->io, zblk, 1, buf);
+ if (retval)
+ goto out2;
memcpy(fs->super->s_jnl_blocks, inode.i_block, EXT2_N_BLOCKS*4);
+ fs->super->s_jnl_blocks[15] = inode.i_size_high;
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:
+out2:
ext2fs_free_mem(&buf);
return retval;
}
* in the filesystem. For very small filesystems, it is not reasonable to
* have a journal that fills more than half of the filesystem.
*/
-int ext2fs_default_journal_size(__u64 blocks)
+int ext2fs_default_journal_size(__u64 num_blocks)
{
- if (blocks < 2048)
+ if (num_blocks < 2048)
return -1;
- if (blocks < 32768)
+ if (num_blocks < 32768)
return (1024);
- if (blocks < 256*1024)
+ if (num_blocks < 256*1024)
return (4096);
- if (blocks < 512*1024)
+ if (num_blocks < 512*1024)
return (8192);
- if (blocks < 1024*1024)
+ if (num_blocks < 1024*1024)
return (16384);
return 32768;
}
+int ext2fs_journal_sb_start(int blocksize)
+{
+ if (blocksize == EXT2_MIN_BLOCK_SIZE)
+ return 2;
+ return 1;
+}
+
/*
* This function adds a journal device to a filesystem
*/
{
struct stat st;
errcode_t retval;
- char buf[1024];
+ char buf[SUPERBLOCK_SIZE];
journal_superblock_t *jsb;
int start;
__u32 i, nr_users;
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_blk64(journal_dev->io, start, -1024,
+ start = ext2fs_journal_sb_start(journal_dev->blocksize);
+ if ((retval = io_channel_read_blk64(journal_dev->io, start,
+ -SUPERBLOCK_SIZE,
buf)))
return retval;
}
/* Writeback the journal superblock */
- if ((retval = io_channel_write_blk64(journal_dev->io, start, -1024, buf)))
+ if ((retval = io_channel_write_blk64(journal_dev->io, start,
+ -SUPERBLOCK_SIZE, buf)))
return retval;
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));
+ memset(fs->super->s_jnl_blocks, 0, sizeof(fs->super->s_jnl_blocks));
fs->super->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
ext2fs_mark_super_dirty(fs);
return 0;
* 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 ext2fs_add_journal_inode2(ext2_filsys fs, blk_t num_blocks,
+ blk64_t goal, int flags)
{
errcode_t retval;
ext2_ino_t journal_ino;
struct stat st;
char jfile[1024];
- int mount_flags, f;
+ int mount_flags;
int fd = -1;
- if ((retval = ext2fs_check_mount_point(fs->device_name, &mount_flags,
- jfile, sizeof(jfile)-10)))
+ if (flags & EXT2_MKJOURNAL_NO_MNT_CHECK)
+ mount_flags = 0;
+ else if ((retval = ext2fs_check_mount_point(fs->device_name,
+ &mount_flags,
+ jfile, sizeof(jfile)-10)))
return retval;
if (mount_flags & EXT2_MF_MOUNTED) {
+#if HAVE_EXT2_IOCTLS
+ int f = 0;
+#endif
strcat(jfile, "/.journal");
/*
#if HAVE_EXT2_IOCTLS
fd = open(jfile, O_RDONLY);
if (fd >= 0) {
- f = 0;
- ioctl(fd, EXT2_IOC_SETFLAGS, &f);
+ retval = ioctl(fd, EXT2_IOC_SETFLAGS, &f);
close(fd);
+ if (retval)
+ return retval;
}
#endif
#endif
if ((fd = open(jfile, O_CREAT|O_WRONLY, 0600)) < 0)
return errno;
- if ((retval = write_journal_file(fs, jfile, size, flags)))
+ /* Note that we can't do lazy journal initialization for mounted
+ * filesystems, since the zero writing is also allocating the
+ * journal blocks. We could use fallocate, but not all kernels
+ * support that, and creating a journal on a mounted ext2
+ * filesystems is extremely rare these days... Ignore it. */
+ flags &= ~EXT2_MKJOURNAL_LAZYINIT;
+
+ if ((retval = write_journal_file(fs, jfile, num_blocks, flags)))
goto errout;
/* Get inode number of the journal file */
goto errout;
}
journal_ino = st.st_ino;
+ memset(fs->super->s_jnl_blocks, 0,
+ sizeof(fs->super->s_jnl_blocks));
} else {
if ((mount_flags & EXT2_MF_BUSY) &&
!(fs->flags & EXT2_FLAG_EXCLUSIVE)) {
}
journal_ino = EXT2_JOURNAL_INO;
if ((retval = write_journal_inode(fs, journal_ino,
- size, flags)))
+ num_blocks, goal, flags)))
return retval;
}
ext2fs_mark_super_dirty(fs);
return 0;
errout:
- if (fd > 0)
+ if (fd >= 0)
close(fd);
return retval;
}
+errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t num_blocks, int flags)
+{
+ return ext2fs_add_journal_inode2(fs, num_blocks, ~0ULL, flags);
+}
+
+
#ifdef DEBUG
main(int argc, char **argv)
{
errcode_t retval;
char *device_name;
- ext2_filsys fs;
+ ext2_filsys fs;
if (argc < 2) {
fprintf(stderr, "Usage: %s filesystem\n", argv[0]);
exit(1);
}
- retval = ext2fs_add_journal_inode(fs, 1024);
+ retval = ext2fs_add_journal_inode(fs, JFS_MIN_JOURNAL_BLOCKS, 0);
if (retval) {
com_err(argv[0], retval, "while adding journal to %s",
device_name);
if (retval) {
printf("Warning, had trouble writing out superblocks.\n");
}
- ext2fs_close(fs);
+ ext2fs_close_free(&fs);
exit(0);
}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff