166 lines
4.7 KiB
C
166 lines
4.7 KiB
C
// vfs.h
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// Author: Josh Holtrop
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// Date: 08/22/04
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// Modified: 12/21/04
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#ifndef __HOS_VFS_H__
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#define __HOS_VFS_H__ __HOS_VFS_H__
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#include "hos_defines.h"
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#include "fs/devices.h"
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#define FS_EXT2 1
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#define VFS_MAX_FS 10
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#define VFS_FT_UNKNOWN 0
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#define VFS_FT_FILE 1
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#define VFS_FT_DIR 2
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#define VFS_FT_CHAR 3
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#define VFS_FT_BLOCK 4
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#define VFS_FT_FIFO 5
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#define VFS_FT_SOCK 6
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#define VFS_FT_SYMLINK 7
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#define VFS_PERMS_OX 0x0001
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#define VFS_PERMS_OW 0x0002
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#define VFS_PERMS_OR 0x0004
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#define VFS_PERMS_GX 0x0008
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#define VFS_PERMS_GW 0x0010
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#define VFS_PERMS_GR 0x0020
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#define VFS_PERMS_UX 0x0040
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#define VFS_PERMS_UW 0x0080
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#define VFS_PERMS_UR 0x0100
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#define VFS_PERMS_STICKY 0x0200
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#define VFS_PERMS_SGID 0x0400
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#define VFS_PERMS_SUID 0x0800
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#define EOF 1000000
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typedef u64_t vfs_inode_t;
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/* Structure to hold information about a mount point */
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typedef struct vfs_mount_s
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{
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int refs;
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void *super;
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int fs;
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major_t major;
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minor_t minor;
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char *mountPoint;
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vfs_inode_t vfs_mount_inode;
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vfs_inode_t vfs_up_inode;
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vfs_inode_t vfs_root_inode;
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struct vfs_mount_s *next;
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struct vfs_mount_s *prev;
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} vfs_mount_t;
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typedef struct
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{
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u16_t type; // file type, of VFS_FILE_TYPE_*
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u32_t size;
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u32_t inode;
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u16_t permissions;
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u16_t uid;
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u16_t gid;
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u32_t atime;
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u32_t mtime;
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u32_t ctime;
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u16_t links;
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u32_t dev;
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} vfs_stat_t;
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typedef struct
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{
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vfs_mount_t *mount;
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void *fs_data;
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} vfs_open_file_t;
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typedef struct
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{
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char name[257];
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u32_t inode_number; // relative inode number returned from fs
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} vfs_dir_entry_t;
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typedef struct
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{
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vfs_mount_t *mount;
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u32_t inode;
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} vfs_file_addr_t;
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/* Every filesystem must provide pointers to its respective functions in a structure like this */
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typedef struct
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{
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void *(*mount_super)(major_t major, minor_t minor);
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int (*umount_super)(vfs_mount_t *mount);
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int (*stat)(vfs_mount_t *mount, u32_t inode_number, vfs_stat_t *stat);
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u32_t (*get_root_inode)(vfs_mount_t *mount);
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int (*link_deref)(vfs_mount_t *mount, u32_t inode_number, char *link);
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int (*free_inodes)(vfs_mount_t *mount);
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int (*total_inodes)(vfs_mount_t *mount);
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int (*free_blocks)(vfs_mount_t *mount);
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int (*total_blocks)(vfs_mount_t *mount);
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u32_t (*alloc_inode)(vfs_mount_t *mount);
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int (*free_inode)(vfs_mount_t *mount, u32_t inode_number);
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u32_t (*alloc_block)(vfs_mount_t *mount);
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int (*free_block)(vfs_mount_t *mount, u32_t block_number);
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int (*open_dir)(vfs_mount_t *mount, u32_t inode_number, vfs_open_file_t *dir);
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int (*read_dir)(vfs_mount_t *mount, vfs_open_file_t *dir, vfs_dir_entry_t *dentry);
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int (*close_dir)(vfs_mount_t *mount, vfs_open_file_t *dir);
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int (*open_file)(vfs_mount_t *mount, u32_t inode_number, vfs_open_file_t *open_file);
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int (*read_file)(vfs_mount_t *mount, vfs_open_file_t *open_file);
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int (*close_file)(vfs_mount_t *mount, vfs_open_file_t *open_file);
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int (*open_block_file)(vfs_mount_t *mount, u32_t inode_number, vfs_open_file_t *open_file);
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int (*read_block_file)(vfs_mount_t *mount, vfs_open_file_t *open_file, void *buffer);
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int (*block_file_seek)(vfs_mount_t *mount, vfs_open_file_t *open_file, u32_t block_number);
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int (*close_block_file)(vfs_mount_t *mount, vfs_open_file_t *open_file);
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} vfs_fs_t;
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int vfs_init();
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int vfs_mount(major_t maj, minor_t min, int fsType, char *mountPoint);
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int vfs_umount(char *mountPoint);
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int vfs_register_fs(int fsn, vfs_fs_t *fs);
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int vfs_umount(char *mountPoint);
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vfs_inode_t vfs_get_inode_number(char *path);
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vfs_inode_t vfs_get_inode_number_rel(vfs_inode_t dir_inode, char *path);
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vfs_inode_t vfs_real_inode(vfs_inode_t vfs_inode);
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vfs_file_addr_t vfs_get_file_addr(vfs_inode_t vfs_inode);
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vfs_inode_t vfs_entry_lookup(vfs_inode_t dir_inode, char *entry);
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int vfs_mount_count();
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vfs_mount_t *vfs_get_mount(int index);
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int vfs_free_inodes(vfs_mount_t *mount);
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int vfs_total_inodes(vfs_mount_t *mount);
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int vfs_free_blocks(vfs_mount_t *mount);
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int vfs_total_blocks(vfs_mount_t *mount);
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vfs_inode_t vfs_alloc_inode(vfs_mount_t *mount);
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int vfs_free_inode(vfs_mount_t *mount, u32_t inode_number);
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u32_t vfs_alloc_block(vfs_mount_t *mount);
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int vfs_free_block(vfs_mount_t *mount, u32_t block_number);
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int vfs_link_deref(vfs_inode_t vfs_inode, char *link);
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int vfs_stat(char *file, vfs_stat_t *stat);
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int vfs_stat_inode(vfs_inode_t vfs_inode, vfs_stat_t *stat);
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vfs_open_file_t *vfs_open_dir(char *path);
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vfs_open_file_t *vfs_open_dir_inode(vfs_inode_t inode);
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int vfs_read_dir(vfs_open_file_t *open_dir, vfs_dir_entry_t *dentry);
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int vfs_close_dir(vfs_open_file_t *open_dir);
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vfs_open_file_t *vfs_open_block_file(char *file);
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vfs_open_file_t *vfs_open_block_file_inode(vfs_inode_t vfs_inode);
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int vfs_read_block_file(vfs_open_file_t *open_file, void *buffer);
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int vfs_block_file_seek(vfs_open_file_t *open_file, u32_t block_number);
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int vfs_close_block_file(vfs_open_file_t *open_file);
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#endif
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