ext2_internal.h

Aller à la documentation de ce fichier.

#ifndef _EXT2_INTERNAL_H_
#define _EXT2_INTERNAL_H_

#include <fs/devfs.h>
#include <vfs.h>

#define EXT2_ROOT_INO 2 
struct ext2_super_block {
        uint32_t  s_inodes_count;               
        uint32_t  s_blocks_count;               
        uint32_t  s_r_blocks_count;             
        uint32_t  s_free_blocks_count;  
        uint32_t  s_free_inodes_count;  
        uint32_t  s_first_data_block;   
        uint32_t  s_log_block_size;             
        uint32_t  s_log_frag_size;              
        uint32_t  s_blocks_per_group;   
        uint32_t  s_frags_per_group;    
        uint32_t  s_inodes_per_group;   
        uint32_t  s_mtime;                              
        uint32_t  s_wtime;                              
        uint16_t  s_mnt_count;                  
        uint16_t  s_max_mnt_count;              
        uint16_t  s_magic;                              
        uint16_t  s_state;                              
        uint16_t  s_errors;                             
        uint16_t  s_minor_rev_level;    
        uint32_t  s_lastcheck;                  
        uint32_t  s_checkinterval;              
        uint32_t  s_creator_os;                 
        uint32_t  s_rev_level;                  
        uint16_t  s_def_resuid;                 
        uint16_t  s_def_resgid;                 
// -- EXT2_DYNAMIC_REV Specific --
        uint32_t  s_first_ino;                  
        uint16_t  s_inode_size;                 
        uint16_t  s_block_group_nr;             
        uint32_t  s_feature_compat;             
        uint32_t  s_feature_incompat;   
        uint32_t  s_feature_ro_compat;  
        uint8_t   s_uuid[16];                   
        char      s_volume_name[16];    
        char      s_last_mounted[64];   
        uint32_t  s_algorithm_usage_bitmap; 
// -- Performance Hints --
        uint8_t   s_prealloc_blocks;    
        uint8_t   s_prealloc_dir_blocks;  
        uint16_t  s_padding1;                   
// -- Journaling Support --
        uint8_t   s_journal_uuid[16];   
        uint32_t  s_journal_inum;               
        uint32_t  s_journal_dev;                
        uint32_t  s_last_orphan;                
// -- Directory Indexing Support --
        uint32_t  s_hash_seed[4];               
        uint8_t   s_def_hash_version;   
        uint8_t   s_padding[3];         
// -- Other options --
        uint32_t  s_default_mount_opts; 
        uint32_t  s_first_meta_bg;              
        uint8_t   s_reserved[760];              
};

/*
 * Codes for operating systems
 */
#define EXT2_OS_LINUX           0 
#define EXT2_OS_HURD            1 
#define EXT2_OS_MASIX           2 
#define EXT2_OS_FREEBSD         3 
#define EXT2_OS_LITES           4 
/*
 * Revision levels
 */
#define EXT2_GOOD_OLD_REV 0             
#define EXT2_DYNAMIC_REV  1             
struct ext2_group_desc {
  uint32_t  bg_block_bitmap;            
  uint32_t  bg_inode_bitmap;            
  uint32_t  bg_inode_table;                     
  uint16_t  bg_free_blocks_count;       
  uint16_t  bg_free_inodes_count;       
  uint16_t  bg_used_dirs_count;         
  uint16_t  bg_pad;                                     
  uint32_t  bg_reserved[3];                     
};

struct ext2_group_desc_internal {
        uint8_t *inode_bitmap; 
        struct ext2_inode *inodes; 
        //TODO: Je pourrais faire de même avec les blocks. À voir...
};

struct ext2_inode {
        uint16_t        i_mode;         
        uint16_t        i_uid;          
        uint32_t        i_size;         
        uint32_t        i_atime;        
        uint32_t        i_ctime;        
        uint32_t        i_mtime;        
        uint32_t        i_dtime;        
        uint16_t        i_gid;          
        uint16_t        i_links_count;  
        uint32_t        i_blocks;       
        uint32_t        i_flags;        
        uint32_t        i_osd1;         
        uint32_t        i_block[15];    
        uint32_t        i_generation;   
        uint32_t        i_file_acl;     
        uint32_t        i_dir_acl;      
        uint32_t        i_faddr;        
        uint32_t        i_osd2[3];      
};

// Types d'inode :
#define EXT2_FT_UNKNOWN         0 
#define EXT2_FT_REG_FILE        1 
#define EXT2_FT_DIR                     2 
#define EXT2_FT_CHRDEV          3 
#define EXT2_FT_BLKDEV          4 
#define EXT2_FT_FIFO            5 
#define EXT2_FT_SOCK            6 
#define EXT2_FT_SYMLINK         7 
struct ext2_directory {
        uint32_t        inode;      
        uint16_t        rec_len;    
        uint8_t         name_len;   
        uint8_t         file_type;  
        char            name[256];  
};

struct directories_t {
        struct ext2_directory *dir; 
        struct directories_t *next; 
};

// -- file format --
#define EXT2_S_IFSOCK   0xC000  
#define EXT2_S_IFLNK    0xA000  
#define EXT2_S_IFREG    0x8000  
#define EXT2_S_IFBLK    0x6000  
#define EXT2_S_IFDIR    0x4000  
#define EXT2_S_IFCHR    0x2000  
#define EXT2_S_IFIFO    0x1000  
// -- process execution user/group override --
#define EXT2_S_ISUID    0x0800  
#define EXT2_S_ISGID    0x0400  
#define EXT2_S_ISVTX    0x0200  
// -- access rights --
#define EXT2_S_IRUSR    0x0100  
#define EXT2_S_IWUSR    0x0080  
#define EXT2_S_IXUSR    0x0040  
#define EXT2_S_IRGRP    0x0020  
#define EXT2_S_IWGRP    0x0010  
#define EXT2_S_IXGRP    0x0008  
#define EXT2_S_IROTH    0x0004  
#define EXT2_S_IWOTH    0x0002  
#define EXT2_S_IXOTH    0x0001  
typedef struct _ext2_fs_instance_t {
        fs_instance_t super; 
        dentry_t * root; 
        struct ext2_super_block superblock; 
        struct ext2_group_desc *group_desc_table; 
        int n_groups;   
        blkdev_read_t read_data; 
        blkdev_write_t write_data; 
        struct ext2_group_desc_internal *group_desc_table_internal; 
} ext2_fs_instance_t;

void umount_EXT2(fs_instance_t *instance);

ssize_t ext2_read(open_file_descriptor * ofd, void * buf, size_t size);

ssize_t ext2_write (open_file_descriptor * ofd, const void *buf, size_t size);

int ext2_close(open_file_descriptor *ofd);

int ext2_readdir(open_file_descriptor * ofd, char * entries, size_t size);

int ext2_stat(fs_instance_t *instance, const char *path, struct stat *stbuf);

int ext2_mknod(inode_t *dir, dentry_t *dentry, mode_t mode, dev_t dev);


int ext2_mkdir(inode_t *dir, dentry_t *dentry, mode_t mode);

int ext2_unlink(inode_t *dir, dentry_t *dentry);

int ext2_truncate(inode_t *inode, off_t off);

int ext2_rmdir(inode_t *dir, dentry_t *dentry);

int ext2_setattr(inode_t *inode, file_attributes_t *attr);

int ext2_seek(open_file_descriptor * ofd, long offset, int whence);

dentry_t *ext2_getroot(struct _fs_instance_t *instance);

dentry_t* ext2_lookup(struct _fs_instance_t *instance, struct _dentry_t* dentry, const char * name);

int ext2_rename(inode_t *old_dir, dentry_t *old_dentry, inode_t *new_dir, dentry_t *new_dentry);

dentry_t * init_rootext2fs(ext2_fs_instance_t *instance);

extern struct _open_file_operations_t ext2fs_fops; 
#endif