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More random progress on mke2fs. Nothing to see yet.
author Rob Landley <rob@landley.net>
date Tue, 23 Jan 2007 13:20:38 -0500
parents 41d55b5d49fd
children e6332139adae
comparison
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74:dfe99495acbc 75:89ca591a9236
4 * 4 *
5 * Copyright 2006 Rob Landley <rob@landley.net> 5 * Copyright 2006 Rob Landley <rob@landley.net>
6 */ 6 */
7 7
8 #include "toys.h" 8 #include "toys.h"
9
10 // Stuff defined in linux/ext2_fs.h
11
12 #define EXT2_SUPER_MAGIC 0xEF53
13
14 struct ext2_inode {
15 uint16_t mode; // File mode
16 uint16_t uid; // Low 16 bits of Owner Uid
17 uint32_t size; // Size in bytes
18 uint32_t atime; // Access time
19 uint32_t ctime; // Creation time
20 uint32_t mtime; // Modification time
21 uint32_t dtime; // Deletion Time
22 uint16_t gid; // Low 16 bits of Group Id
23 uint16_t links_count; // Links count
24 uint32_t blocks; // Blocks count
25 uint32_t flags; // File flags
26 uint32_t reserved1;
27 uint32_t block[15]; // Pointers to blocks
28 uint32_t generation; // File version (for NFS)
29 uint32_t file_acl; // File ACL
30 uint32_t dir_acl; // Directory ACL
31 uint32_t faddr; // Fragment address
32 uint8_t frag; // Fragment number
33 uint8_t fsize; // Fragment size
34 uint16_t pad1;
35 uint16_t uid_high; // High bits of uid
36 uint16_t gid_high; // High bits of gid
37 uint32_t reserved2;
38 };
39
40 struct ext2_super_block {
41 uint32_t inodes_count; // Inodes count
42 uint32_t blocks_count; // Blocks count
43 uint32_t r_blocks_count; // Reserved blocks count
44 uint32_t free_blocks_count; // Free blocks count
45 uint32_t free_inodes_count; // Free inodes count
46 uint32_t first_data_block; // First Data Block
47 uint32_t log_block_size; // Block size
48 uint32_t log_frag_size; // Fragment size
49 uint32_t blocks_per_group; // # Blocks per group
50 uint32_t frags_per_group; // # Fragments per group
51 uint32_t inodes_per_group; // # Inodes per group
52 uint32_t mtime; // Mount time
53 uint32_t wtime; // Write time
54 uint16_t mnt_count; // Mount count
55 uint16_t max_mnt_count; // Maximal mount count
56 uint16_t magic; // Magic signature
57 uint16_t state; // File system state
58 uint16_t errors; // Behaviour when detecting errors
59 uint16_t minor_rev_level; // minor revision level
60 uint32_t lastcheck; // time of last check
61 uint32_t checkinterval; // max. time between checks
62 uint32_t creator_os; // OS
63 uint32_t rev_level; // Revision level
64 uint16_t def_resuid; // Default uid for reserved blocks
65 uint16_t def_resgid; // Default gid for reserved blocks
66 uint32_t first_ino; // First non-reserved inode
67 uint16_t inode_size; // size of inode structure
68 uint16_t block_group_nr; // block group # of this superblock
69 uint32_t feature_compat; // compatible feature set
70 uint32_t feature_incompat; // incompatible feature set
71 uint32_t feature_ro_compat; // readonly-compatible feature set
72 char uuid[16]; // 128-bit uuid for volume
73 char volume_name[16]; // volume name
74 char last_mounted[64]; // directory where last mounted
75 uint32_t alg_usage_bitmap; // For compression
76 // For EXT2_COMPAT_PREALLOC
77 uint8_t prealloc_blocks; // Nr of blocks to try to preallocate
78 uint8_t prealloc_dir_blocks; //Nr to preallocate for dirs
79 uint16_t padding1;
80 // For EXT3_FEATURE_COMPAT_HAS_JOURNAL
81 uint8_t journal_uuid[16]; // uuid of journal superblock
82 uint32_t journal_inum; // inode number of journal file
83 uint32_t journal_dev; // device number of journal file
84 uint32_t last_orphan; // start of list of inodes to delete
85 uint32_t hash_seed[4]; // HTREE hash seed
86 uint8_t def_hash_version; // Default hash version to use
87 uint8_t padding2[3];
88 uint32_t default_mount_opts;
89 uint32_t first_meta_bg; // First metablock block group
90 uint32_t reserved[190]; // Padding to the end of the block
91 };
92
93 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
94 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
95 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
96 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
97 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
98 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
99
100 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
101 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
102 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
103
104 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
105 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
106 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
107 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
108 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
109
110 #define EXT2_NAME_LEN 255
111
112 struct ext2_dir_entry_2 {
113 uint32_t inode; // Inode number
114 uint16_t rec_len; // Directory entry length
115 uint8_t name_len; // Name length
116 uint8_t file_type;
117 char name[255]; // File name
118 };
119
120 // Ext2 directory file types. Only the low 3 bits are used. The
121 // other bits are reserved for now.
122
123 enum {
124 EXT2_FT_UNKNOWN,
125 EXT2_FT_REG_FILE,
126 EXT2_FT_DIR,
127 EXT2_FT_CHRDEV,
128 EXT2_FT_BLKDEV,
129 EXT2_FT_FIFO,
130 EXT2_FT_SOCK,
131 EXT2_FT_SYMLINK,
132 EXT2_FT_MAX
133 };
134
135 9
136 // b - block size (1024, 2048, 4096) 10 // b - block size (1024, 2048, 4096)
137 // F - force (run on mounted device or non-block device) 11 // F - force (run on mounted device or non-block device)
138 // i - bytes per inode 12 // i - bytes per inode
139 // N - number of inodes 13 // N - number of inodes
149 // J - journal options (size=1024-102400 blocks,device=) 23 // J - journal options (size=1024-102400 blocks,device=)
150 // device=/dev/blah or LABEL=label UUID=uuid 24 // device=/dev/blah or LABEL=label UUID=uuid
151 25
152 // E - extended options (stride=stripe-size blocks) 26 // E - extended options (stride=stripe-size blocks)
153 // O - none,dir_index,filetype,has_journal,journal_dev,sparse_super 27 // O - none,dir_index,filetype,has_journal,journal_dev,sparse_super
154
155
156 // This is what's in a UUID according to the spec at
157 // http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
158
159 //struct uuid {
160 // uint32_t time_low;
161 // uint16_t time_mid;
162 // uint16_t time_hi_and_version;
163 // uint8_t clock_seq_hi_and_reserved;
164 // uint8_t clock_seq_low;
165 // uint8_t node[6];
166 //};
167 28
168 29
169 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm 30 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
170 // we should generate a uuid structure by reading a clock with 100 nanosecond 31 // we should generate a uuid structure by reading a clock with 100 nanosecond
171 // precision, normalizing it to the start of the gregorian calendar in 1582, 32 // precision, normalizing it to the start of the gregorian calendar in 1582,
193 54
194 int mke2fs_main(void) 55 int mke2fs_main(void)
195 { 56 {
196 struct ext2_super_block *sb = xzalloc(sizeof(struct ext2_super_block)); 57 struct ext2_super_block *sb = xzalloc(sizeof(struct ext2_super_block));
197 int temp; 58 int temp;
59 off_t length;
198 60
199 // Handle command line arguments. 61 // Handle command line arguments.
200 62
201 if (!*toys.optargs || (!CFG_MKE2FS_GEN && toys.optargs[1])) usage_exit(); 63 if (toys.optargs[1]) {
202 if (CFG_MKE2FS_GEN && toys.optargs[1]) { 64 sscanf(toys.optargs[1], "%u", &(sb->inodes_count));
203 temp = O_RDWR|O_CREAT; 65 temp = O_RDWR|O_CREAT;
204 xaccess(toys.optargs[1], R_OK);
205 } else temp = O_RDWR; 66 } else temp = O_RDWR;
206 if (toy.mke2fs.blocksize!=1024 && toy.mke2fs.blocksize!=2048 67
207 && toy.mke2fs.blocksize!=4096) error_exit("bad blocksize"); 68 // Check if filesystem is mounted
208 69
209 // For mke?fs, open file. For gene?fs, create file. 70 // For mke?fs, open file. For gene?fs, create file.
210 toy.mke2fs.fsfd = xcreate(*toys.optargs, temp, 0777); 71 length = fdlength(toy.mke2fs.fsfd = xcreate(*toys.optargs, temp, 0777));
211 72
212 // We don't autodetect block size from external journaling devices, instead 73 if (toy.mke2fs.blocksize && toy.mke2fs.blocksize!=1024
213 // we write our block size to that journaling device. (If they want a 74 && toy.mke2fs.blocksize!=2048 && toy.mke2fs.blocksize!=4096)
214 // specific block size, they have the -b option.) 75 error_exit("bad blocksize");
215 76
216 // What's the deal with fs_type? 77 // Determine block size. If unspecified, use simple heuristic.
217 // line 1059 78 if (toy.mke2fs.blocksize)
79 sb->log_block_size = (length && length < 1<<24) ? 1024 : 4096;
80 else sb->log_block_size = toy.mke2fs.blocksize;
218 81
219 // We skip the first 1k (to avoid the boot sector, if any). Use this to 82 if (!sb->inodes_count) sb->inodes_count = length/toy.mke2fs.blocksize;
220 // figure out if this file is seekable.
221 if(-1 == lseek(toy.mke2fs.fsfd, 1024, SEEK_SET)) {
222 toy.mke2fs.noseek=1;
223 xwrite(toy.mke2fs.fsfd, sb, 1024);
224 }
225 83
226 // Fill out superblock structure 84 // Fill out superblock structure
227 85
228 sb->rev_level = SWAP_LE32(1); 86 sb->rev_level = SWAP_LE32(1);
229 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE); 87 sb->feature_incompat = SWAP_LE32(EXT2_FEATURE_INCOMPAT_FILETYPE);
230 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER); 88 sb->feature_ro_compat = SWAP_LE32(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER);
231 89
232 // If we're called as mke3fs or mkfs.ext3, do a journal. 90 // If we're called as mke3fs or mkfs.ext3, do a journal.
233 91
234 if (strchr(toys.which->name,'3')) 92 //if (strchr(toys.which->name,'3'))
235 sb->feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL; 93 // sb->feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
94
95 // We skip the first 1k (to avoid the boot sector, if any). Use this to
96 // figure out if this file is seekable.
97 if(-1 == lseek(toy.mke2fs.fsfd, 1024, SEEK_SET)) perror_exit("lseek");
98 //{ toy.mke2fs.noseek=1; xwrite(toy.mke2fs.fsfd, sb, 1024); }
236 99
237 // Write superblock to disk. 100 // Write superblock to disk.
238 xwrite(toy.mke2fs.fsfd, sb, 3072); // 4096-1024 101 xwrite(toy.mke2fs.fsfd, sb, 3072); // 4096-1024
239 102
240 return 0; 103 return 0;