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alexvoste
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#ifndef VFS_H
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#define VFS_H
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include "../syscall/errno.h"
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#define VFS_MAX_PATH 512
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#define VFS_MAX_NAME 256
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#define VFS_MAX_MOUNTS 16
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#define VFS_MAX_OPEN_FILES 512
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#define O_RDONLY 0x000
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#define O_WRONLY 0x001
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#define O_RDWR 0x002
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#define O_ACCMODE 0x003
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#define O_CREAT 0x040
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#define O_TRUNC 0x200
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#define O_APPEND 0x400
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#define O_DIRECTORY 0x10000
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#define O_NONBLOCK 0x800
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#define SEEK_SET 0
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#define SEEK_CUR 1
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#define SEEK_END 2
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#define FD_CLOEXEC (1 << 0)
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#define TASK_MAX_FDS 256
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typedef enum {
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VFS_NODE_FILE = 0,
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VFS_NODE_DIR = 1,
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VFS_NODE_CHARDEV = 2,
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VFS_NODE_BLKDEV = 3,
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VFS_NODE_SYMLINK = 4,
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VFS_NODE_PIPE = 5,
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} vnode_type_t;
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typedef struct {
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uint64_t st_ino;
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vnode_type_t st_type;
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uint32_t st_mode;
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uint32_t st_uid;
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uint32_t st_gid;
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uint64_t st_size;
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uint64_t st_blocks;
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} vfs_stat_t;
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typedef struct {
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uint64_t d_ino;
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uint8_t d_type;
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char d_name[VFS_MAX_NAME];
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} vfs_dirent_t;
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typedef struct vnode vnode_t;
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typedef struct vfs_mount vfs_mount_t;
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typedef struct vnode_ops {
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int64_t (*read) (vnode_t *node, void *buf, size_t len, uint64_t offset);
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int64_t (*write) (vnode_t *node, const void *buf, size_t len, uint64_t offset);
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int (*truncate)(vnode_t *node, uint64_t new_size);
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int (*lookup) (vnode_t *dir, const char *name, vnode_t **out);
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int (*readdir) (vnode_t *dir, uint64_t index, vfs_dirent_t *out);
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int (*mkdir) (vnode_t *dir, const char *name, uint32_t mode);
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int (*create) (vnode_t *dir, const char *name, uint32_t mode, vnode_t **out);
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int (*unlink) (vnode_t *dir, const char *name);
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int (*rename) (vnode_t *src_dir, const char *src_name,
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vnode_t *dst_dir, const char *dst_name);
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int (*stat) (vnode_t *node, vfs_stat_t *out);
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void (*ref) (vnode_t *node);
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void (*unref) (vnode_t *node);
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int64_t (*ioctl) (vnode_t *node, uint64_t req, void *arg);
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} vnode_ops_t;
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struct vnode {
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vnode_type_t type;
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uint32_t mode;
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uint32_t uid;
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uint32_t gid;
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uint64_t size;
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uint64_t ino;
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const vnode_ops_t *ops;
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void *fs_data;
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volatile int refcount;
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vfs_mount_t *mounted;
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};
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struct vfs_mount {
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char path[VFS_MAX_PATH];
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char device[32];
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char fstype[16];
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vnode_t *root;
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bool used;
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void *fs_priv;
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void (*unmount)(void *fs_priv);
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void (*sync)(void *fs_priv);
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};
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typedef struct {
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vnode_t *vnode;
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uint64_t offset;
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int flags;
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volatile int refcount;
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} vfs_file_t;
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typedef struct {
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vfs_file_t *file;
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int fd_flags;
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} fd_entry_t;
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typedef struct fd_table fd_table_t;
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struct fd_table {
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fd_entry_t entries[TASK_MAX_FDS];
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};
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void vfs_init (void);
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int vfs_mount (const char *path, vnode_t *fs_root);
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int vfs_mount_fs(const char *path, vnode_t *fs_root,
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void *fs_priv, void (*unmount_fn)(void *),
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void (*sync_fn)(void *));
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int vfs_umount (const char *path);
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int vfs_lookup (const char *path, vnode_t **out);
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int vfs_open (const char *path, int flags, uint32_t mode, vfs_file_t **out);
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void vfs_close (vfs_file_t *file);
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int64_t vfs_read (vfs_file_t *file, void *buf, size_t len);
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int64_t vfs_write (vfs_file_t *file, const void *buf, size_t len);
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int64_t vfs_seek (vfs_file_t *file, int64_t offset, int whence);
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int vfs_stat (const char *path, vfs_stat_t *out);
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int vfs_fstat (vfs_file_t *file, vfs_stat_t *out);
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int64_t vfs_ioctl (vfs_file_t *file, uint64_t req, void *arg);
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int vfs_readdir(vfs_file_t *file, vfs_dirent_t *out);
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int vfs_mkdir (const char *path, uint32_t mode);
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void vnode_ref (vnode_t *node);
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void vnode_unref (vnode_t *node);
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vfs_file_t *vfs_file_alloc(void);
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void vfs_file_free (vfs_file_t *file);
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fd_table_t *fd_table_create (void);
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fd_table_t *fd_table_clone (const fd_table_t *src);
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void fd_table_cloexec(fd_table_t *table);
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void fd_table_destroy(fd_table_t *table);
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int fd_alloc (fd_table_t *table, vfs_file_t *file, int min_fd);
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vfs_file_t *fd_get (const fd_table_t *table, int fd);
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int fd_close (fd_table_t *table, int fd);
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int fd_dup2 (fd_table_t *table, int oldfd, int newfd);
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int fd_set_flags(fd_table_t *table, int fd, int flags);
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int fd_get_flags(const fd_table_t *table, int fd);
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void vfs_sync_all(void);
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int vfs_init_stdio(void *task_ptr);
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typedef struct {
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char path[VFS_MAX_PATH];
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char device[32];
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char fstype[16];
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uint32_t flags;
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} vfs_mount_info_t;
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int vfs_set_mount_info(const char *path, const char *device, const char *fstype);
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int vfs_list_mounts(vfs_mount_info_t *out, int max);
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typedef struct {
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uint64_t f_bsize;
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uint64_t f_blocks;
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uint64_t f_bfree;
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uint64_t f_bavail;
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uint64_t f_files;
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uint64_t f_ffree;
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uint32_t f_flag;
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uint32_t f_namemax;
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} vfs_statvfs_t;
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int vfs_statvfs(const char *path, vfs_statvfs_t *out);
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#endif
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