117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
#ifndef EXT2_TYPE_H
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#define EXT2_TYPE_H
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/* On the disk all attributes are stored in little endian format.
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* Inode structure was taken from linux/include/linux/ext2_fs.h.
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*/
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typedef struct {
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u16_t i_mode; /* File mode */
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u16_t i_uid; /* Low 16 bits of Owner Uid */
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u32_t i_size; /* Size in bytes */
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u32_t i_atime; /* Access time */
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u32_t i_ctime; /* Creation time */
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u32_t i_mtime; /* Modification time */
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u32_t i_dtime; /* Deletion Time */
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u16_t i_gid; /* Low 16 bits of Group Id */
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u16_t i_links_count; /* Links count */
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u32_t i_blocks; /* Blocks count */
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u32_t i_flags; /* File flags */
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union {
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struct {
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u32_t l_i_reserved1;
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} linux1;
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struct {
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u32_t h_i_translator;
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} hurd1;
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struct {
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u32_t m_i_reserved1;
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} masix1;
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} osd1; /* OS dependent 1 */
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u32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
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u32_t i_generation; /* File version (for NFS) */
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u32_t i_file_acl; /* File ACL */
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u32_t i_dir_acl; /* Directory ACL */
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u32_t i_faddr; /* Fragment address */
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union {
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struct {
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u8_t l_i_frag; /* Fragment number */
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u8_t l_i_fsize; /* Fragment size */
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u16_t i_pad1;
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u16_t l_i_uid_high; /* these 2 fields */
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u16_t l_i_gid_high; /* were reserved2[0] */
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u32_t l_i_reserved2;
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} linux2;
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struct {
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u8_t h_i_frag; /* Fragment number */
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u8_t h_i_fsize; /* Fragment size */
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u16_t h_i_mode_high;
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u16_t h_i_uid_high;
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u16_t h_i_gid_high;
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u32_t h_i_author;
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} hurd2;
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struct {
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u8_t m_i_frag; /* Fragment number */
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u8_t m_i_fsize; /* Fragment size */
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u16_t m_pad1;
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u32_t m_i_reserved2[2];
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} masix2;
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} osd2; /* OS dependent 2 */
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} d_inode;
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/* Part of on disk directory (entry description).
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* It includes all fields except name (since size is unknown.
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* In revision 0 name_len is u16_t (here is structure of rev >= 0.5,
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* where name_len was truncated with the upper 8 bit to add file_type).
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* MIN_DIR_ENTRY_SIZE depends on this structure.
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*/
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struct ext2_disk_dir_desc {
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u32_t d_ino;
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u16_t d_rec_len;
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u8_t d_name_len;
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u8_t d_file_type;
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char d_name[1];
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};
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/* Current position in block */
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#define CUR_DISC_DIR_POS(cur_desc, base) ((char*)cur_desc - (char*)base)
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/* Return pointer to the next dentry */
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#define NEXT_DISC_DIR_DESC(cur_desc) ((struct ext2_disk_dir_desc*)\
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((char*)cur_desc + cur_desc->d_rec_len))
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/* Return next dentry's position in block */
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#define NEXT_DISC_DIR_POS(cur_desc, base) (cur_desc->d_rec_len +\
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CUR_DISC_DIR_POS(cur_desc, base))
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struct buf {
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/* Data portion of the buffer. */
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union fsdata_u *bp;
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/* Header portion of the buffer. */
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struct buf *b_next; /* used to link all free bufs in a chain */
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struct buf *b_prev; /* used to link all free bufs the other way */
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struct buf *b_hash; /* used to link bufs on hash chains */
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block_t b_blocknr; /* block number of its (minor) device */
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dev_t b_dev; /* major | minor device where block resides */
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char b_dirt; /* CLEAN or DIRTY */
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char b_count; /* number of users of this buffer */
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unsigned int b_bytes; /* Number of bytes allocated in bp */
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};
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/* Structure with options affecting global behavior. */
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struct opt {
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int use_orlov; /* Bool: Use Orlov allocator */
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/* In ext2 there are reserved blocks, which can be used by super user only or
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* user specified by resuid/resgid. Right now we can't check what user
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* requested operation (VFS limitation), so it's a small warkaround.
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*/
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int mfsalloc; /* Bool: use mfslike allocator */
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int use_reserved_blocks; /* Bool: small workaround */
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unsigned int block_with_super;/* Int: where to read super block,
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* uses 1k units. */
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int use_prealloc; /* Bool: use preallocation */
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};
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#endif /* EXT2_TYPE_H */
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