More random progress on mke2fs. Nothing to see yet.

1 files changed, 22 insertions, 159 deletions

diff --git a/toys/mke2fs.c b/toys/mke2fs.c
index a586a906..8266cec4 100644
--- a/toys/mke2fs.c
+++ b/toys/mke2fs.c
@@ -7,132 +7,6 @@
 
 #include "toys.h"
 
-// Stuff defined in linux/ext2_fs.h
-
-#define EXT2_SUPER_MAGIC  0xEF53
-
-struct ext2_inode {
-	uint16_t mode;        // File mode
-	uint16_t uid;         // Low 16 bits of Owner Uid
-	uint32_t size;        // Size in bytes
-	uint32_t atime;       // Access time
-	uint32_t ctime;       // Creation time
-	uint32_t mtime;       // Modification time
-	uint32_t dtime;       // Deletion Time
-	uint16_t gid;         // Low 16 bits of Group Id
-	uint16_t links_count; // Links count
-	uint32_t blocks;      // Blocks count
-	uint32_t flags;       // File flags
-	uint32_t reserved1;
-	uint32_t block[15];   // Pointers to blocks
-	uint32_t generation;  // File version (for NFS)
-	uint32_t file_acl;    // File ACL
-	uint32_t dir_acl;     // Directory ACL
-	uint32_t faddr;       // Fragment address
-	uint8_t  frag;        // Fragment number
-	uint8_t  fsize;       // Fragment size
-	uint16_t pad1;
-	uint16_t uid_high;    // High bits of uid
-	uint16_t gid_high;    // High bits of gid
-	uint32_t reserved2;
-};
-
-struct ext2_super_block {
-	uint32_t inodes_count;      // Inodes count
-	uint32_t blocks_count;      // Blocks count
-	uint32_t r_blocks_count;    // Reserved blocks count
-	uint32_t free_blocks_count; // Free blocks count
-	uint32_t free_inodes_count; // Free inodes count
-	uint32_t first_data_block;  // First Data Block
-	uint32_t log_block_size;    // Block size
-	uint32_t log_frag_size;     // Fragment size
-	uint32_t blocks_per_group;  // # Blocks per group
-	uint32_t frags_per_group;   // # Fragments per group
-	uint32_t inodes_per_group;  // # Inodes per group
-	uint32_t mtime;             // Mount time
-	uint32_t wtime;             // Write time
-	uint16_t mnt_count;         // Mount count
-	uint16_t max_mnt_count;     // Maximal mount count
-	uint16_t magic;             // Magic signature
-	uint16_t state;             // File system state
-	uint16_t errors;            // Behaviour when detecting errors
-	uint16_t minor_rev_level;   // minor revision level
-	uint32_t lastcheck;         // time of last check
-	uint32_t checkinterval;     // max. time between checks
-	uint32_t creator_os;        // OS
-	uint32_t rev_level;         // Revision level
-	uint16_t def_resuid;        // Default uid for reserved blocks
-	uint16_t def_resgid;        // Default gid for reserved blocks
-	uint32_t first_ino;         // First non-reserved inode
-	uint16_t inode_size;        // size of inode structure
-	uint16_t block_group_nr;    // block group # of this superblock
-	uint32_t feature_compat;    // compatible feature set
-	uint32_t feature_incompat;  // incompatible feature set
-	uint32_t feature_ro_compat; // readonly-compatible feature set
-	char     uuid[16];          // 128-bit uuid for volume
-	char     volume_name[16];   // volume name
-	char     last_mounted[64];  // directory where last mounted
-	uint32_t alg_usage_bitmap;  // For compression
-	// For EXT2_COMPAT_PREALLOC
-	uint8_t  prealloc_blocks;   // Nr of blocks to try to preallocate
-	uint8_t  prealloc_dir_blocks; //Nr to preallocate for dirs
-	uint16_t padding1;
-	// For EXT3_FEATURE_COMPAT_HAS_JOURNAL
-	uint8_t  journal_uuid[16];   // uuid of journal superblock
-	uint32_t journal_inum;       // inode number of journal file
-	uint32_t journal_dev;        // device number of journal file
-	uint32_t last_orphan;        // start of list of inodes to delete
-	uint32_t hash_seed[4];       // HTREE hash seed
-	uint8_t  def_hash_version;   // Default hash version to use
-	uint8_t  padding2[3];
-	uint32_t default_mount_opts;
- 	uint32_t first_meta_bg;      // First metablock block group
-	uint32_t reserved[190];      // Padding to the end of the block
-};
-
-#define EXT2_FEATURE_COMPAT_DIR_PREALLOC	0x0001
-#define EXT2_FEATURE_COMPAT_IMAGIC_INODES	0x0002
-#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004
-#define EXT2_FEATURE_COMPAT_EXT_ATTR		0x0008
-#define EXT2_FEATURE_COMPAT_RESIZE_INO		0x0010
-#define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020
-
-#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
-#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
-#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
-
-#define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001
-#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
-#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004
-#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008
-#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010
-
-#define EXT2_NAME_LEN 255
-
-struct ext2_dir_entry_2 {
-	uint32_t inode;         // Inode number
-    uint16_t rec_len;       // Directory entry length
-    uint8_t  name_len;      // Name length
-    uint8_t  file_type;
-	char     name[255];     // File name
-};
-
-// Ext2 directory file types.  Only the low 3 bits are used.  The
-// other bits are reserved for now.
-
-enum {
-	EXT2_FT_UNKNOWN,
-	EXT2_FT_REG_FILE,
-	EXT2_FT_DIR,
-	EXT2_FT_CHRDEV,
-	EXT2_FT_BLKDEV,
-	EXT2_FT_FIFO,
-	EXT2_FT_SOCK,
-	EXT2_FT_SYMLINK,
-	EXT2_FT_MAX
-};
-
-
 	// b - block size (1024, 2048, 4096)
 	// F - force (run on mounted device or non-block device)
 	// i - bytes per inode 
@@ -153,19 +27,6 @@ enum {
 	// O - none,dir_index,filetype,has_journal,journal_dev,sparse_super
 
 
-// This is what's in a UUID according to the spec at
-// http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
-
-//struct uuid {
-//	uint32_t  time_low;
-//	uint16_t  time_mid;
-//	uint16_t  time_hi_and_version;
-//	uint8_t   clock_seq_hi_and_reserved;
-//	uint8_t   clock_seq_low;
-//	uint8_t   node[6];
-//};
-
-
 // According to http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
 // we should generate a uuid structure by reading a clock with 100 nanosecond
 // precision, normalizing it to the start of the gregorian calendar in 1582,
@@ -195,33 +56,30 @@ int mke2fs_main(void)
 {
 	struct ext2_super_block *sb = xzalloc(sizeof(struct ext2_super_block));
 	int temp;
+	off_t length;
 
 	// Handle command line arguments.
 
-	if (!*toys.optargs || (!CFG_MKE2FS_GEN && toys.optargs[1])) usage_exit();
-	if (CFG_MKE2FS_GEN && toys.optargs[1]) {
-			temp = O_RDWR|O_CREAT;
-			xaccess(toys.optargs[1], R_OK);
+	if (toys.optargs[1]) {
+		sscanf(toys.optargs[1], "%u", &(sb->inodes_count));
+		temp = O_RDWR|O_CREAT;
 	} else temp = O_RDWR;
-	if (toy.mke2fs.blocksize!=1024 && toy.mke2fs.blocksize!=2048
-		&& toy.mke2fs.blocksize!=4096) error_exit("bad blocksize");
+
+	// Check if filesystem is mounted
 
 	// For mke?fs, open file.  For gene?fs, create file.
-	toy.mke2fs.fsfd = xcreate(*toys.optargs, temp, 0777);
+	length = fdlength(toy.mke2fs.fsfd = xcreate(*toys.optargs, temp, 0777));
 
-    // We don't autodetect block size from external journaling devices, instead
-	// we write our block size to that journaling device.  (If they want a
-	// specific block size, they have the -b option.)
+	if (toy.mke2fs.blocksize && toy.mke2fs.blocksize!=1024
+		&& toy.mke2fs.blocksize!=2048 && toy.mke2fs.blocksize!=4096)
+			error_exit("bad blocksize");
 
-// What's the deal with fs_type?
-// line 1059
+	// Determine block size.  If unspecified, use simple heuristic.
+	if (toy.mke2fs.blocksize) 
+		sb->log_block_size = (length && length < 1<<24) ? 1024 : 4096;
+	else sb->log_block_size = toy.mke2fs.blocksize;
 
-	// We skip the first 1k (to avoid the boot sector, if any).  Use this to
-	// figure out if this file is seekable.
-	if(-1 == lseek(toy.mke2fs.fsfd, 1024, SEEK_SET)) {
-		toy.mke2fs.noseek=1;
-		xwrite(toy.mke2fs.fsfd, sb, 1024);
-	}
+	if (!sb->inodes_count) sb->inodes_count = length/toy.mke2fs.blocksize;
 
 	// Fill out superblock structure
 
@@ -231,8 +89,13 @@ int mke2fs_main(void)
 
 	// If we're called as mke3fs or mkfs.ext3, do a journal.
 
-	if (strchr(toys.which->name,'3'))
-		sb->feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
+	//if (strchr(toys.which->name,'3'))
+	//	sb->feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
+
+	// We skip the first 1k (to avoid the boot sector, if any).  Use this to
+	// figure out if this file is seekable.
+	if(-1 == lseek(toy.mke2fs.fsfd, 1024, SEEK_SET)) perror_exit("lseek");
+	//{ toy.mke2fs.noseek=1; xwrite(toy.mke2fs.fsfd, sb, 1024); }
 
 	// Write superblock to disk.	
 	xwrite(toy.mke2fs.fsfd, sb, 3072); // 4096-1024