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mkfs.reiser: new applet. needs much polishing
Signed-off-by: Vladimir Dronnikov <dronnikov@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
parent
d784b65be7
commit
0d8ea64af6
@ -263,6 +263,7 @@ IF_MKFIFO(APPLET(mkfifo, _BB_DIR_USR_BIN, _BB_SUID_DROP))
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IF_MKFS_EXT2(APPLET_ODDNAME(mkfs.ext2, mkfs_ext2, _BB_DIR_SBIN, _BB_SUID_DROP, mkfs_ext2))
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//IF_MKE2FS(APPLET_ODDNAME(mkfs.ext3, mke2fs, _BB_DIR_SBIN, _BB_SUID_DROP, mkfs_ext3))
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IF_MKFS_MINIX(APPLET_ODDNAME(mkfs.minix, mkfs_minix, _BB_DIR_SBIN, _BB_SUID_DROP, mkfs_minix))
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IF_MKFS_REISER(APPLET_ODDNAME(mkfs.reiser, mkfs_reiser, _BB_DIR_SBIN, _BB_SUID_DROP, mkfs_reiser))
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IF_MKFS_VFAT(APPLET_ODDNAME(mkfs.vfat, mkfs_vfat, _BB_DIR_SBIN, _BB_SUID_DROP, mkfs_vfat))
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IF_MKNOD(APPLET(mknod, _BB_DIR_BIN, _BB_SUID_DROP))
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IF_CRYPTPW(APPLET_ODDNAME(mkpasswd, cryptpw, _BB_DIR_USR_BIN, _BB_SUID_DROP, mkpasswd))
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@ -2771,6 +2771,15 @@
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"\n -l FILENAME Read bad blocks list from FILENAME" \
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"\n -v Make version 2 filesystem" \
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#define mkfs_reiser_trivial_usage \
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"[-f] [-l LABEL] BLOCKDEV [4K-BLOCKS]"
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#define mkfs_reiser_full_usage "\n\n" \
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"Make a ReiserFS V3 filesystem\n" \
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"\nOptions:" \
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"\n -f Force" \
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"\n -l LBL Volume label" \
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#define mkfs_vfat_trivial_usage \
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"[-v] [-n LABEL] BLOCKDEV [KBYTES]"
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/* Accepted but ignored:
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@ -213,6 +213,12 @@ config FSCK_MINIX
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check for and attempt to repair any corruption that occurs to a minix
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filesystem.
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config MKFS_EXT2
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bool "mkfs_ext2"
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default n
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help
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Utility to create EXT2 filesystems.
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config MKFS_MINIX
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bool "mkfs_minix"
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default n
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@ -233,18 +239,18 @@ config FEATURE_MINIX2
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this. If you enabled 'mkfs_minix' then you almost certainly want to
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be using the version 2 filesystem support.
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config MKFS_REISER
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bool "mkfs_reiser"
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default n
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help
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Utility to create ReiserFS filesystems.
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config MKFS_VFAT
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bool "mkfs_vfat"
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default n
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help
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Utility to create FAT32 filesystems.
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config MKFS_EXT2
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bool "mkfs_ext2"
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default n
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help
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Utility to create EXT2 filesystems.
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config GETOPT
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bool "getopt"
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default n
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@ -24,6 +24,7 @@ lib-$(CONFIG_LOSETUP) += losetup.o
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lib-$(CONFIG_MDEV) += mdev.o
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lib-$(CONFIG_MKFS_EXT2) += mkfs_ext2.o
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lib-$(CONFIG_MKFS_MINIX) += mkfs_minix.o
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lib-$(CONFIG_MKFS_REISER) += mkfs_reiser.o
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lib-$(CONFIG_MKFS_VFAT) += mkfs_vfat.o
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lib-$(CONFIG_MKSWAP) += mkswap.o
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lib-$(CONFIG_MORE) += more.o
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379
util-linux/mkfs_reiser.c
Normal file
379
util-linux/mkfs_reiser.c
Normal file
@ -0,0 +1,379 @@
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/* vi: set sw=4 ts=4: */
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/*
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* mkfs_reiser: utility to create ReiserFS filesystem
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*
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* Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include <linux/fs.h>
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#include "volume_id/volume_id_internal.h"
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char BUG_wrong_field_size(void);
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#define STORE_LE(field, value) \
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do { \
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if (sizeof(field) == 4) \
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field = cpu_to_le32(value); \
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else if (sizeof(field) == 2) \
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field = cpu_to_le16(value); \
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else if (sizeof(field) == 1) \
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field = (value); \
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else \
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BUG_wrong_field_size(); \
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} while (0)
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#define FETCH_LE32(field) \
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(sizeof(field) == 4 ? cpu_to_le32(field) : BUG_wrong_field_size())
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struct journal_params {
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uint32_t jp_journal_1st_block; /* where does journal start from on its device */
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uint32_t jp_journal_dev; /* journal device st_rdev */
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uint32_t jp_journal_size; /* size of the journal on FS creation. used to make sure they don't overflow it */
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uint32_t jp_journal_trans_max; /* max number of blocks in a transaction. */
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uint32_t jp_journal_magic; /* random value made on fs creation (this was sb_journal_block_count) */
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uint32_t jp_journal_max_batch; /* max number of blocks to batch into a trans */
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uint32_t jp_journal_max_commit_age; /* in seconds, how old can an async commit be */
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uint32_t jp_journal_max_trans_age; /* in seconds, how old can a transaction be */
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};
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struct reiserfs_journal_header {
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uint32_t jh_last_flush_trans_id; /* id of last fully flushed transaction */
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uint32_t jh_first_unflushed_offset; /* offset in the log of where to start replay after a crash */
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uint32_t jh_mount_id;
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struct journal_params jh_journal;
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uint32_t jh_last_check_mount_id; /* the mount id of the fs during the last reiserfsck --check. */
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};
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struct reiserfs_super_block {
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uint32_t sb_block_count; /* 0 number of block on data device */
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uint32_t sb_free_blocks; /* 4 free blocks count */
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uint32_t sb_root_block; /* 8 root of the tree */
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struct journal_params sb_journal; /* 12 */
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uint16_t sb_blocksize; /* 44 */
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uint16_t sb_oid_maxsize; /* 46 max size of object id array, see get_objectid() commentary */
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uint16_t sb_oid_cursize; /* 48 current size of object id array */
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uint16_t sb_umount_state; /* 50 this is set to 1 when filesystem was umounted, to 2 - when not */
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char s_magic[10]; /* 52 "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
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uint16_t sb_fs_state; /* 62 it is set to used by fsck to mark which phase of rebuilding is done (used for fsck debugging) */
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uint32_t sb_hash_function_code; /* 64 code of fuction which was/is/will be used to sort names in a directory. See codes in above */
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uint16_t sb_tree_height; /* 68 height of filesytem tree. Tree consisting of only one root block has 2 here */
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uint16_t sb_bmap_nr; /* 70 amount of bitmap blocks needed to address each block of file system */
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uint16_t sb_version; /* 72 this field is only reliable on filesystem with non-standard journal */
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uint16_t sb_reserved_for_journal; /* 74 size in blocks of journal area on main device, we need to keep after non-standard journal relocation */
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uint32_t sb_inode_generation; /* 76 */
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uint32_t sb_flags; /* 80 Right now used only by inode-attributes, if enabled */
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unsigned char s_uuid[16]; /* 84 filesystem unique identifier */
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unsigned char s_label[16]; /* 100 filesystem volume label */
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uint16_t sb_mnt_count; /* 116 */
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uint16_t sb_max_mnt_count; /* 118 */
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uint32_t sb_lastcheck; /* 120 */
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uint32_t sb_check_interval; /* 124 */
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/* zero filled by mkreiserfs and reiserfs_convert_objectid_map_v1() so any additions must be updated there as well. */
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char s_unused[76]; /* 128 */
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/* 204 */
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};
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/* Header of a disk block. More precisely, header of a formatted leaf
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or internal node, and not the header of an unformatted node. */
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struct block_head {
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uint16_t blk2_level; /* Level of a block in the tree. */
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uint16_t blk2_nr_item; /* Number of keys/items in a block. */
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uint16_t blk2_free_space; /* Block free space in bytes. */
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uint16_t blk_reserved;
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uint32_t reserved[4];
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};
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#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
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#define REISERFS_3_6_SUPER_MAGIC_STRING "ReIsEr2Fs"
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#define REISERFS_FORMAT_3_6 2
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#define DEFAULT_MAX_MNT_COUNT 30 /* 30 mounts */
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#define DEFAULT_CHECK_INTERVAL (180 * 60 * 60 * 24) /* 180 days */
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#define FS_CLEANLY_UMOUNTED 1 /* this was REISERFS_VALID_FS */
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#define JOURNAL_MIN_SIZE 512
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/* biggest possible single transaction, don't change for now (8/3/99) */
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#define JOURNAL_TRANS_MAX 1024
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#define JOURNAL_TRANS_MIN 256 /* need to check whether it works */
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#define JOURNAL_DEFAULT_RATIO 8 /* default journal size / max trans length */
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#define JOURNAL_MIN_RATIO 2
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/* max blocks to batch into one transaction, don't make this any bigger than 900 */
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#define JOURNAL_MAX_BATCH 900
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#define JOURNAL_MAX_COMMIT_AGE 30
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// Standard mkreiserfs 3.6.21:
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// -b | --block-size N size of file-system block, in bytes
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// -j | --journal-device FILE path to separate device to hold journal
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// -s | --journal-size N size of the journal in blocks
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// -o | --journal-offset N offset of the journal from the start of
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// the separate device, in blocks
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// -t | --transaction-max-size N maximal size of transaction, in blocks
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// -B | --badblocks file store all bad blocks given in file on the fs
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// -h | --hash rupasov|tea|r5 hash function to use by default
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// -u | --uuid UUID store UUID in the superblock
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// -l | --label LABEL store LABEL in the superblock
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// --format 3.5|3.6 old 3.5 format or newer 3.6
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// -f | --force specified once, make mkreiserfs the whole
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// disk, not block device or mounted partition;
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// specified twice, do not ask for confirmation
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// -q | --quiet quiet work without messages, progress and
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// questions. Useful if run in a script. For use
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// by end users only.
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// -d | --debug print debugging information during mkreiser
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// -V print version and exit
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// Options not commented below are taken but silently ignored:
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enum {
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OPT_b = 1 << 0,
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OPT_j = 1 << 1,
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OPT_s = 1 << 2,
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OPT_o = 1 << 3,
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OPT_t = 1 << 4,
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OPT_B = 1 << 5,
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OPT_h = 1 << 6,
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OPT_u = 1 << 7,
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OPT_l = 1 << 8, // label
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OPT_f = 1 << 9, // ask no questions
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OPT_q = 1 << 10,
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OPT_d = 1 << 11,
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//OPT_V = 1 << 12, // -V version. bbox applets don't support that
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};
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int mkfs_reiser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int mkfs_reiser_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned blocksize = 4096;
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unsigned journal_blocks = 8192;
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unsigned blocks, bitmap_blocks, i, block;
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time_t timestamp;
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const char *label = "";
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struct stat st;
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int fd;
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uint8_t *buf;
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struct reiserfs_super_block *sb;
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struct journal_params *jp;
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struct block_head *root;
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// using global "option_mask32" instead of local "opts":
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// we are register starved here
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opt_complementary = "-1:b+";
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/*opts =*/ getopt32(argv, "b:j:s:o:t:B:h:u:l:fqd",
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &label);
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argv += optind; // argv[0] -- device
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// check the device is a block device
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fd = xopen(argv[0], O_WRONLY | O_EXCL);
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fstat(fd, &st);
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if (!S_ISBLK(st.st_mode) && !(option_mask32 & OPT_f))
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bb_error_msg_and_die("not a block device");
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// check if it is mounted
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// N.B. what if we format a file? find_mount_point will return false negative since
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// it is loop block device which mounted!
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if (find_mount_point(argv[0], 0))
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bb_error_msg_and_die("can't format mounted filesystem");
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// open the device, get size in blocks
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if (argv[1]) {
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blocks = xatoull(argv[1]);
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// seek past end fails on block devices but works on files
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if (lseek(fd, blocks * blocksize - 1, SEEK_SET) != (off_t)-1) {
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xwrite(fd, "", 1); // file grows if needed
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}
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//else {
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// bb_error_msg("warning, block device is smaller");
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//}
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} else {
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blocks = (uoff_t)xlseek(fd, 0, SEEK_END) / blocksize;
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}
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// block number sanity check
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// we have a limit: skipped area, super block, journal and root block
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// all have to be addressed by one first bitmap
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block = REISERFS_DISK_OFFSET_IN_BYTES / blocksize // boot area
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+ 1 // sb
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+ 1 // bitmap#0
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+ journal_blocks+1 // journal
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;
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// count overhead
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bitmap_blocks = (blocks - 1) / (blocksize * 8) + 1;
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i = block + bitmap_blocks;
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// check overhead
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if (MIN(blocksize * 8, blocks) < i)
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bb_error_msg_and_die("need >= %u blocks", i);
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// ask confirmation?
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// TODO: ???
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// wipe out first REISERFS_DISK_OFFSET_IN_BYTES of device
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// TODO: do we really need to wipe?!
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xlseek(fd, REISERFS_DISK_OFFSET_IN_BYTES, SEEK_SET);
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// fill superblock
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sb = (struct reiserfs_super_block *)xzalloc(blocksize);
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// block count
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STORE_LE(sb->sb_block_count, blocks);
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STORE_LE(sb->sb_free_blocks, blocks - i);
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// TODO: decypher!
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STORE_LE(sb->sb_root_block, block);
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// fill journal related fields
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jp = &sb->sb_journal;
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STORE_LE(jp->jp_journal_1st_block, REISERFS_DISK_OFFSET_IN_BYTES / blocksize + 1/*sb*/ + 1/*bmp#0*/);
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timestamp = time(NULL);
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srandom(timestamp);
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STORE_LE(jp->jp_journal_magic, random());
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STORE_LE(jp->jp_journal_size, journal_blocks);
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STORE_LE(jp->jp_journal_trans_max, JOURNAL_TRANS_MAX);
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STORE_LE(jp->jp_journal_max_batch, JOURNAL_MAX_BATCH);
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STORE_LE(jp->jp_journal_max_commit_age, JOURNAL_MAX_COMMIT_AGE);
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// sizes
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STORE_LE(sb->sb_blocksize, blocksize);
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STORE_LE(sb->sb_oid_maxsize, (blocksize - sizeof(*sb)) / sizeof(uint32_t) / 2 * 2);
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STORE_LE(sb->sb_oid_cursize, 2); // "." and ".."
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strcpy(sb->s_magic, REISERFS_3_6_SUPER_MAGIC_STRING);
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STORE_LE(sb->sb_bmap_nr, (bitmap_blocks > ((1LL << 16) - 1)) ? 0 : bitmap_blocks);
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// misc
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STORE_LE(sb->sb_version, REISERFS_FORMAT_3_6);
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STORE_LE(sb->sb_lastcheck, timestamp);
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STORE_LE(sb->sb_check_interval, DEFAULT_CHECK_INTERVAL);
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STORE_LE(sb->sb_mnt_count, 1);
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STORE_LE(sb->sb_max_mnt_count, DEFAULT_MAX_MNT_COUNT);
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STORE_LE(sb->sb_umount_state, FS_CLEANLY_UMOUNTED);
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STORE_LE(sb->sb_tree_height, 2);
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STORE_LE(sb->sb_hash_function_code, 3); // R5_HASH
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STORE_LE(sb->sb_flags, 1);
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//STORE_LE(sb->sb_reserved_for_journal, 0);
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// create UUID
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generate_uuid(sb->s_uuid);
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// write the label
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safe_strncpy((char *)sb->s_label, label, sizeof(sb->s_label));
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// TODO: EMPIRIC! ENDIANNESS!
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// superblock has only 204 bytes. What are these?
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buf = (uint8_t *)sb;
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buf[205] = 1;
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buf[209] = 3;
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// put superblock
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xwrite(fd, sb, blocksize);
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// create bitmaps
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buf = xzalloc(blocksize);
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// bitmap #0 uses initial "block"+1 blocks
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i = block + 1;
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memset(buf, 0xFF, i / 8);
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buf[i / 8] = (1 << (i & 7)) - 1; //0..7 => 00000000..01111111
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// mark trailing absent blocks, if any
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if (blocks < 8*blocksize) {
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unsigned n = 8*blocksize - blocks;
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i = n / 8;
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buf[blocksize - i - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
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memset(buf + blocksize - i, 0xFF, i); // N.B. no overflow here!
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}
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// put bitmap #0
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xwrite(fd, buf, blocksize);
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// now go journal blocks
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memset(buf, 0, blocksize);
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for (i = 0; i < journal_blocks; i++)
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xwrite(fd, buf, blocksize);
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// dump journal control block
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memcpy(&((struct reiserfs_journal_header *)buf)->jh_journal, &sb->sb_journal, sizeof(sb->sb_journal));
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xwrite(fd, buf, blocksize);
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// other bitmaps are in every (8*blocksize)-th block
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// N.B. they use the only block -- namely bitmap itself!
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buf[0] = 0x01;
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// put bitmaps
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for (i = 1; i < bitmap_blocks; i++) {
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xlseek(fd, i*8*blocksize * blocksize, SEEK_SET);
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// mark trailing absent blocks, if any
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if (i == bitmap_blocks - 1 && (blocks % (8*blocksize))) {
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unsigned n = 8*blocksize - blocks % (8*blocksize);
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unsigned j = n / 8;
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buf[blocksize - j - 1] |= 0x7F00 >> (n & 7); //0..7 => 00000000..11111110
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memset(buf + blocksize - j, 0xFF, j); // N.B. no overflow here!
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}
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xwrite(fd, buf, blocksize);
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}
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// fill root block
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// block head
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memset(buf, 0, blocksize);
|
||||
root = (struct block_head *)buf;
|
||||
STORE_LE(root->blk2_level, 1); // leaf node
|
||||
STORE_LE(root->blk2_nr_item, 2); // "." and ".."
|
||||
STORE_LE(root->blk2_free_space, blocksize - sizeof(struct block_head));
|
||||
// item head
|
||||
// root directory
|
||||
// TODO: EMPIRIC! ENDIANNESS!
|
||||
// TODO: indented assignments seem to be timestamps
|
||||
buf[4] = 0134;
|
||||
buf[24] = 01;
|
||||
buf[28] = 02;
|
||||
buf[42] = 054;
|
||||
buf[44] = 0324;
|
||||
buf[45] = 017;
|
||||
buf[46] = 01;
|
||||
buf[48] = 01;
|
||||
buf[52] = 02;
|
||||
buf[56] = 01;
|
||||
buf[60] = 0364;
|
||||
buf[61] = 01;
|
||||
buf[64] = 02;
|
||||
buf[66] = 060;
|
||||
buf[68] = 0244;
|
||||
buf[69] = 017;
|
||||
buf[4004] = 01;
|
||||
buf[4008] = 01;
|
||||
buf[4012] = 02;
|
||||
buf[4016] = 050;
|
||||
buf[4018] = 04;
|
||||
buf[4020] = 02;
|
||||
buf[4028] = 01;
|
||||
buf[4032] = 040;
|
||||
buf[4034] = 04;
|
||||
|
||||
buf[4036] = 056; buf[4037] = 056; // ".."
|
||||
buf[4044] = 056; // "."
|
||||
|
||||
buf[4052] = 0355;
|
||||
buf[4053] = 0101;
|
||||
buf[4056] = 03;
|
||||
buf[4060] = 060;
|
||||
buf[4076] = 0173;
|
||||
buf[4077] = 0240;
|
||||
buf[4078] = 0344;
|
||||
buf[4079] = 0112;
|
||||
buf[4080] = 0173;
|
||||
buf[4081] = 0240;
|
||||
buf[4082] = 0344;
|
||||
buf[4083] = 0112;
|
||||
buf[4084] = 0173;
|
||||
buf[4085] = 0240;
|
||||
buf[4086] = 0344;
|
||||
buf[4087] = 0112;
|
||||
buf[4088] = 01;
|
||||
|
||||
// put root block
|
||||
xlseek(fd, block * blocksize, SEEK_SET);
|
||||
xwrite(fd, buf, blocksize);
|
||||
|
||||
// cleanup
|
||||
if (ENABLE_FEATURE_CLEAN_UP) {
|
||||
free(buf);
|
||||
free(sb);
|
||||
}
|
||||
|
||||
xclose(fd);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
Loading…
Reference in New Issue
Block a user