/*
* initialize.c --- initialize a filesystem handle given superblock
* parameters. Used by mke2fs when initializing a filesystem.
+ *
+ * Copyright (C) 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %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>
-#include <stdlib.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
-#include <linux/fs.h>
-#include <linux/ext2_fs.h>
-
+#include "ext2_fs.h"
#include "ext2fs.h"
+#if defined(__linux__) && defined(EXT2_OS_LINUX)
+#define CREATOR_OS EXT2_OS_LINUX
+#else
+#if defined(__GNU__) && defined(EXT2_OS_HURD)
+#define CREATOR_OS EXT2_OS_HURD
+#else
+#if defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD)
+#define CREATOR_OS EXT2_OS_FREEBSD
+#else
+#if defined(LITES) && defined(EXT2_OS_LITES)
+#define CREATOR_OS EXT2_OS_LITES
+#else
+#define CREATOR_OS EXT2_OS_LINUX /* by default */
+#endif /* defined(LITES) && defined(EXT2_OS_LITES) */
+#endif /* defined(__FreeBSD__) && defined(EXT2_OS_FREEBSD) */
+#endif /* defined(__GNU__) && defined(EXT2_OS_HURD) */
+#endif /* defined(__linux__) && defined(EXT2_OS_LINUX) */
+
+/*
+ * Note we override the kernel include file's idea of what the default
+ * check interval (never) should be. It's a good idea to check at
+ * least *occasionally*, specially since servers will never rarely get
+ * to reboot, since Linux is so robust these days. :-)
+ *
+ * 180 days (six months) seems like a good value.
+ */
+#ifdef EXT2_DFL_CHECKINTERVAL
+#undef EXT2_DFL_CHECKINTERVAL
+#endif
+#define EXT2_DFL_CHECKINTERVAL (86400L * 180L)
+
errcode_t ext2fs_initialize(const char *name, int flags,
struct ext2_super_block *param,
io_manager manager, ext2_filsys *ret_fs)
int rem;
int overhead = 0;
blk_t group_block;
+ int ipg;
int i, j;
+ blk_t numblocks;
+ char *buf;
+ int meta_bg_size, meta_bg, has_super, old_desc_blocks;
if (!param || !param->s_blocks_count)
- return EINVAL;
+ return EXT2_ET_INVALID_ARGUMENT;
- fs = (ext2_filsys) malloc(sizeof(struct struct_ext2_filsys));
- if (!fs)
- return ENOMEM;
+ retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys),
+ (void **) &fs);
+ if (retval)
+ return retval;
memset(fs, 0, sizeof(struct struct_ext2_filsys));
+ fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
fs->flags = flags | EXT2_FLAG_RW;
+ fs->umask = 022;
+#ifdef WORDS_BIGENDIAN
+ fs->flags |= EXT2_FLAG_SWAP_BYTES;
+#endif
retval = manager->open(name, IO_FLAG_RW, &fs->io);
if (retval)
goto cleanup;
- fs->device_name = malloc(strlen(name)+1);
- if (!fs->device_name) {
- retval = ENOMEM;
+ fs->io->app_data = fs;
+ retval = ext2fs_get_mem(strlen(name)+1, (void **) &fs->device_name);
+ if (retval)
goto cleanup;
- }
+
strcpy(fs->device_name, name);
- fs->super = super = malloc(SUPERBLOCK_SIZE);
- if (!super) {
- retval = ENOMEM;
+ retval = ext2fs_get_mem(SUPERBLOCK_SIZE, (void **) &super);
+ if (retval)
goto cleanup;
- }
+ fs->super = super;
+
memset(super, 0, SUPERBLOCK_SIZE);
#define set_field(field, default) (super->field = param->field ? \
set_field(s_first_data_block, super->s_log_block_size ? 0 : 1);
set_field(s_max_mnt_count, EXT2_DFL_MAX_MNT_COUNT);
set_field(s_errors, EXT2_ERRORS_DEFAULT);
+ set_field(s_feature_compat, 0);
+ set_field(s_feature_incompat, 0);
+ set_field(s_feature_ro_compat, 0);
+ set_field(s_first_meta_bg, 0);
+ if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP)
+ return EXT2_ET_UNSUPP_FEATURE;
+ if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)
+ return EXT2_ET_RO_UNSUPP_FEATURE;
+
+ set_field(s_rev_level, EXT2_GOOD_OLD_REV);
+ if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
+ set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
+ set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
+ }
set_field(s_checkinterval, EXT2_DFL_CHECKINTERVAL);
- super->s_lastcheck = time(NULL);
+ super->s_mkfs_time = super->s_lastcheck = time(NULL);
+
+ super->s_creator_os = CREATOR_OS;
fs->blocksize = EXT2_BLOCK_SIZE(super);
fs->fragsize = EXT2_FRAG_SIZE(super);
frags_per_block = fs->blocksize / fs->fragsize;
-
- set_field(s_blocks_per_group, 8192); /* default: 8192 blocks/group */
+
+ /* default: (fs->blocksize*8) blocks/group, up to 2^16 (GDT limit) */
+ set_field(s_blocks_per_group, fs->blocksize * 8);
+ if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
+ super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
super->s_frags_per_group = super->s_blocks_per_group * frags_per_block;
super->s_blocks_count = param->s_blocks_count;
+ super->s_r_blocks_count = param->s_r_blocks_count;
+ if (super->s_r_blocks_count >= param->s_blocks_count) {
+ retval = EXT2_ET_INVALID_ARGUMENT;
+ goto cleanup;
+ }
+
+ /*
+ * If we're creating an external journal device, we don't need
+ * to bother with the rest.
+ */
+ if (super->s_feature_incompat &
+ EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
+ fs->group_desc_count = 0;
+ ext2fs_mark_super_dirty(fs);
+ *ret_fs = fs;
+ return 0;
+ }
retry:
- set_field(s_r_blocks_count, super->s_blocks_count/20); /* 5% default */
-
fs->group_desc_count = (super->s_blocks_count -
super->s_first_data_block +
EXT2_BLOCKS_PER_GROUP(super) - 1)
/ EXT2_BLOCKS_PER_GROUP(super);
+ if (fs->group_desc_count == 0)
+ return EXT2_ET_TOOSMALL;
fs->desc_blocks = (fs->group_desc_count +
EXT2_DESC_PER_BLOCK(super) - 1)
/ EXT2_DESC_PER_BLOCK(super);
- set_field(s_inodes_count, (super->s_blocks_count*fs->blocksize)/4096);
+ i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
+ set_field(s_inodes_count, super->s_blocks_count / i);
/*
+ * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
+ * that we have enough inodes for the filesystem(!)
+ */
+ if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
+ super->s_inodes_count = EXT2_FIRST_INODE(super)+1;
+
+ /*
* There should be at least as many inodes as the user
* requested. Figure out how many inodes per group that
- * should be.
+ * should be. But make sure that we don't allocate more than
+ * one bitmap's worth of inodes each group.
*/
- super->s_inodes_per_group = (super->s_inodes_count +
- fs->group_desc_count - 1) /
- fs->group_desc_count;
-
+ ipg = (super->s_inodes_count + fs->group_desc_count - 1) /
+ fs->group_desc_count;
+ if (ipg > fs->blocksize * 8) {
+ if (super->s_blocks_per_group >= 256) {
+ /* Try again with slightly different parameters */
+ super->s_blocks_per_group -= 8;
+ super->s_blocks_count = param->s_blocks_count;
+ super->s_frags_per_group = super->s_blocks_per_group *
+ frags_per_block;
+ goto retry;
+ } else
+ return EXT2_ET_TOO_MANY_INODES;
+ }
+
+ if (ipg > EXT2_MAX_INODES_PER_GROUP(super))
+ ipg = EXT2_MAX_INODES_PER_GROUP(super);
+
+ super->s_inodes_per_group = ipg;
+ if (super->s_inodes_count > ipg * fs->group_desc_count)
+ super->s_inodes_count = ipg * fs->group_desc_count;
+
/*
* Make sure the number of inodes per group completely fills
* the inode table blocks in the descriptor. If not, add some
* additional inodes/group. Waste not, want not...
*/
- fs->inode_blocks_per_group = (super->s_inodes_per_group +
- EXT2_INODES_PER_BLOCK(super) - 1) /
- EXT2_INODES_PER_BLOCK(super);
- super->s_inodes_per_group = fs->inode_blocks_per_group *
- EXT2_INODES_PER_BLOCK(super);
-
+ fs->inode_blocks_per_group = (((super->s_inodes_per_group *
+ EXT2_INODE_SIZE(super)) +
+ EXT2_BLOCK_SIZE(super) - 1) /
+ EXT2_BLOCK_SIZE(super));
+ super->s_inodes_per_group = ((fs->inode_blocks_per_group *
+ EXT2_BLOCK_SIZE(super)) /
+ EXT2_INODE_SIZE(super));
+ /*
+ * Finally, make sure the number of inodes per group is a
+ * multiple of 8. This is needed to simplify the bitmap
+ * splicing code.
+ */
+ super->s_inodes_per_group &= ~7;
+ fs->inode_blocks_per_group = (((super->s_inodes_per_group *
+ EXT2_INODE_SIZE(super)) +
+ EXT2_BLOCK_SIZE(super) - 1) /
+ EXT2_BLOCK_SIZE(super));
+
/*
* adjust inode count to reflect the adjusted inodes_per_group
*/
* includes the superblock backup, the group descriptor
* backups, the inode bitmap, the block bitmap, and the inode
* table.
+ *
+ * XXX Not all block groups need the descriptor blocks, but
+ * being clever is tricky...
*/
- overhead = 3 + fs->desc_blocks + fs->inode_blocks_per_group;
- super->s_free_blocks_count = super->s_blocks_count -
- super->s_first_data_block - (overhead*fs->group_desc_count);
-
+ overhead = (int) (3 + fs->desc_blocks + fs->inode_blocks_per_group);
+
+ /* This can only happen if the user requested too many inodes */
+ if (overhead > super->s_blocks_per_group)
+ return EXT2_ET_TOO_MANY_INODES;
+
/*
* See if the last group is big enough to support the
* necessary data structures. If not, we need to get rid of
* it.
*/
- rem = (super->s_blocks_count - super->s_first_data_block) %
- super->s_blocks_per_group;
+ rem = (int) ((super->s_blocks_count - super->s_first_data_block) %
+ super->s_blocks_per_group);
if ((fs->group_desc_count == 1) && rem && (rem < overhead))
return EXT2_ET_TOOSMALL;
if (rem && (rem < overhead+50)) {
* count.
*/
- retval = ext2fs_allocate_block_bitmap(fs, &fs->block_map);
+ retval = ext2fs_get_mem(strlen(fs->device_name) + 80,
+ (void **) &buf);
if (retval)
goto cleanup;
- retval = ext2fs_allocate_inode_bitmap(fs, &fs->inode_map);
+ sprintf(buf, "block bitmap for %s", fs->device_name);
+ retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
if (retval)
goto cleanup;
+
+ sprintf(buf, "inode bitmap for %s", fs->device_name);
+ retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
+ if (retval)
+ goto cleanup;
+
+ ext2fs_free_mem((void **) &buf);
- fs->group_desc = malloc(fs->desc_blocks * fs->blocksize);
- if (!fs->group_desc) {
- retval = ENOMEM;
+ retval = ext2fs_get_mem((size_t) fs->desc_blocks * fs->blocksize,
+ (void **) &fs->group_desc);
+ if (retval)
goto cleanup;
- }
- memset(fs->group_desc, 0, fs->desc_blocks * fs->blocksize);
+ memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);
+
+ /*
+ * Reserve the superblock and group descriptors for each
+ * group, and fill in the correct group statistics for group.
+ * Note that although the block bitmap, inode bitmap, and
+ * inode table have not been allocated (and in fact won't be
+ * by this routine), they are accounted for nevertheless.
+ */
group_block = super->s_first_data_block;
+ super->s_free_blocks_count = 0;
+ if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
+ old_desc_blocks = fs->super->s_first_meta_bg;
+ else
+ old_desc_blocks = fs->desc_blocks;
for (i = 0; i < fs->group_desc_count; i++) {
- for (j=0; j < fs->desc_blocks+1; j++)
- ext2fs_mark_block_bitmap(fs, fs->block_map,
- group_block + j);
+ if (i == fs->group_desc_count-1) {
+ numblocks = (fs->super->s_blocks_count -
+ fs->super->s_first_data_block) %
+ fs->super->s_blocks_per_group;
+ if (!numblocks)
+ numblocks = fs->super->s_blocks_per_group;
+ } else
+ numblocks = fs->super->s_blocks_per_group;
+
+ has_super = ext2fs_bg_has_super(fs, i);
+
+ if (has_super) {
+ ext2fs_mark_block_bitmap(fs->block_map, group_block);
+ numblocks--;
+ }
+ meta_bg_size = (fs->blocksize /
+ sizeof (struct ext2_group_desc));
+ meta_bg = i / meta_bg_size;
+
+ if (!(fs->super->s_feature_incompat &
+ EXT2_FEATURE_INCOMPAT_META_BG) ||
+ (meta_bg < fs->super->s_first_meta_bg)) {
+ if (has_super) {
+ for (j=0; j < old_desc_blocks; j++)
+ ext2fs_mark_block_bitmap(fs->block_map,
+ group_block + j + 1);
+ numblocks -= old_desc_blocks;
+ }
+ } else {
+ if (has_super)
+ has_super = 1;
+ if (((i % meta_bg_size) == 0) ||
+ ((i % meta_bg_size) == 1) ||
+ ((i % meta_bg_size) == (meta_bg_size-1))) {
+ ext2fs_mark_block_bitmap(fs->block_map,
+ group_block + has_super);
+ numblocks--;
+ }
+ }
+
+ numblocks -= 2 + fs->inode_blocks_per_group;
+
+ super->s_free_blocks_count += numblocks;
+ fs->group_desc[i].bg_free_blocks_count = numblocks;
+ fs->group_desc[i].bg_free_inodes_count =
+ fs->super->s_inodes_per_group;
+ fs->group_desc[i].bg_used_dirs_count = 0;
+
group_block += super->s_blocks_per_group;
}
ext2fs_free(fs);
return retval;
}
-
-
-
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff