fs.h

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/*
    This file is part of Fennix Kernel.
 
    Fennix Kernel is free software: you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation, either version 3 of
    the License, or (at your option) any later version.
 
    Fennix Kernel is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
 
#ifndef __FENNIX_API_FILESYSTEM_H__
#define __FENNIX_API_FILESYSTEM_H__
 
#include <types.h>
 
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
 
#define S_IFMT32 037777600000
 
#define S_IFMT 0170000
 
/* Whiteout */
#define S_IFWHT 0160000
/* Socket */
#define S_IFSOCK 0140000
/* Symbolic link */
#define S_IFLNK 0120000
/* Regular file */
#define S_IFREG 0100000
/* Block device */
#define S_IFBLK 0060000
/* Directory */
#define S_IFDIR 0040000
/* Character device */
#define S_IFCHR 0020000
/* FIFO */
#define S_IFIFO 0010000
 
#define S_ISUID 04000
#define S_ISGID 02000
#define S_ISVTX 01000
 
#define S_IRWXU 0700
#define S_IRUSR 0400
#define S_IWUSR 0200
#define S_IXUSR 0100
 
#define S_IRWXG 0070
#define S_IRGRP 0040
#define S_IWGRP 0020
#define S_IXGRP 0010
 
#define S_IRWXO 0007
#define S_IROTH 0004
#define S_IWOTH 0002
#define S_IXOTH 0001
 
#define O_RDONLY 00
#define O_WRONLY 01
#define O_RDWR 02
#define O_CREAT 0100
#define O_EXCL 0200
#define O_TRUNC 01000
#define O_APPEND 02000
#define O_NOFOLLOW 0400000
#define O_CLOEXEC 02000000
 
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
 
#define DT_UNKNOWN 0x0
#define DT_FIFO 0x1
#define DT_CHR 0x2
#define DT_DIR 0x4
#define DT_BLK 0x6
#define DT_REG 0x8
#define DT_LNK 0xA
#define DT_SOCK 0xC
#define DT_WHT 0xE
 
#define IFTODT(x) ((x) >> 12 & 0xF)
#define DTTOIF(x) ((x) << 12)
 
#define SYMLOOP_MAX 40
 
#ifndef __cplusplus
#define static_assert _Static_assert
#endif
 
#ifdef __LP64__
static_assert(sizeof(dev_t) == 8, "dev_t must be 64 bits");
static_assert(sizeof(ino_t) == 8, "ino_t must be 64 bits");
static_assert(sizeof(mode_t) == 4, "mode_t must be 32 bits");
static_assert(sizeof(nlink_t) == 4, "nlink_t must be 32 bits");
static_assert(sizeof(uid_t) == 4, "uid_t must be 32 bits");
static_assert(sizeof(gid_t) == 4, "gid_t must be 32 bits");
static_assert(sizeof(off_t) == 8, "off_t must be 64 bits");
static_assert(sizeof(time_t) == 8, "time_t must be 64 bits");
static_assert(sizeof(blksize_t) == 8, "blksize_t must be 64 bits");
static_assert(sizeof(blkcnt_t) == 8, "blkcnt_t must be 64 bits");
#else
static_assert(sizeof(dev_t) == 4, "dev_t must be 32 bits");
static_assert(sizeof(ino_t) == 4, "ino_t must be 32 bits");
static_assert(sizeof(mode_t) == 2, "mode_t must be 16 bits");
static_assert(sizeof(nlink_t) == 2, "nlink_t must be 16 bits");
static_assert(sizeof(uid_t) == 2, "uid_t must be 16 bits");
static_assert(sizeof(gid_t) == 2, "gid_t must be 16 bits");
static_assert(sizeof(off_t) == 4, "off_t must be 32 bits");
static_assert(sizeof(time_t) == 4, "time_t must be 32 bits");
static_assert(sizeof(blksize_t) == 4, "blksize_t must be 32 bits");
static_assert(sizeof(blkcnt_t) == 4, "blkcnt_t must be 32 bits");
#endif
 
#undef static_assert
 
struct kstat
{
    dev_t Device;
 
    ino_t Index;
 
    mode_t Mode;
 
    nlink_t HardLinks;
 
    uid_t UserID;
 
    gid_t GroupID;
 
    dev_t RawDevice;
 
    off_t Size;
 
    time_t AccessTime;
 
    time_t ModifyTime;
 
    time_t ChangeTime;
 
    blksize_t BlockSize;
 
    blkcnt_t Blocks;
 
    mode_t Attribute;
 
#ifdef __cplusplus
 
    dev_t MakeDevice(int Major, int Minor)
    {
        return ((Major & 0xFFF) << 8) |
               (Minor & 0xFF);
    }
 
    int GetMajor()
    {
        return ((unsigned int)(Device) >> 8) & 0xFFF;
    }
 
    int GetMinor()
    {
        return Device & 0xFF;
    }
 
    void SetFileType(mode_t Type)
    {
        Mode = (Mode & ~S_IFMT) |
               (Type & S_IFMT);
    }
 
    mode_t GetFileType() { return Mode & S_IFMT; }
    void ClearFileType() { Mode = Mode & ~S_IFMT; }
    bool IsType(mode_t Type) { return (Mode & S_IFMT) == Type; }
 
    void SetPermissions(mode_t Permissions)
    {
        Mode = (Mode & S_IFMT) |
               (Permissions & ~S_IFMT);
    }
 
    mode_t GetPermissions() { return Mode & ~S_IFMT; }
    void ClearPermissions() { Mode = Mode & S_IFMT; }
 
#endif // __cplusplus
};
 
struct kdirent
{
    ino_t d_ino;
    off_t d_off;
    unsigned short d_reclen;
    unsigned char d_type;
    char d_name[];
};
 
struct Inode
{
    dev_t Device, RawDevice;
    ino_t Index;
    mode_t Mode;
    uint32_t Flags;
    off_t Offset;
 
    uintptr_t KernelData;
    void *PrivateData;
 
#ifdef __cplusplus
 
    /* ... */
 
    void SetDevice(int Major, int Minor)
    {
        this->RawDevice = ((Major & 0xFFF) << 8) |
                          (Minor & 0xFF);
    }
 
    int GetMajor()
    {
        return ((unsigned int)(this->RawDevice) >> 8) & 0xFFF;
    }
 
    int GetMinor()
    {
        return this->RawDevice & 0xFF;
    }
 
    Inode()
    {
        Device = 0;
        RawDevice = 0;
        Index = 0;
        Mode = 0;
        Flags = 0;
        Offset = 0;
        KernelData = 0x0;
        PrivateData = nullptr;
    }
 
    ~Inode() = default;
 
#else // __cplusplus
 
#define INODE_MAKEDEV(major, minor)   \
    ((dev_t)(((major & 0xFFF) << 8) | \
             (minor & 0xFF)))
 
#define INODE_MAJOR(rdev) \
    ((int)(((rdev) >> 8) & 0xFFF))
 
#define INODE_MINOR(rdev) \
    ((int)((rdev) & 0xFF))
 
#endif // __cplusplus
};
 
struct InodeOperations
{
    int (*Lookup)(struct Inode *Parent, const char *Name, struct Inode **Result);
    int (*Create)(struct Inode *Parent, const char *Name, mode_t Mode, struct Inode **Result);
    int (*Remove)(struct Inode *Parent, const char *Name);
    int (*Rename)(struct Inode *Parent, const char *OldName, const char *NewName);
    ssize_t (*Read)(struct Inode *Node, void *Buffer, size_t Size, off_t Offset);
    ssize_t (*Write)(struct Inode *Node, const void *Buffer, size_t Size, off_t Offset);
    int (*Truncate)(struct Inode *Node, off_t Size);
    int (*Open)(struct Inode *Node, int Flags, mode_t Mode);
    int (*Close)(struct Inode *Node);
    int (*Ioctl)(struct Inode *Node, unsigned long Request, void *Argp);
    ssize_t (*ReadDir)(struct Inode *Node, struct kdirent *Buffer, size_t Size, off_t Offset, off_t Entries);
    int (*MkDir)(struct Inode *Parent, const char *Name, mode_t Mode, struct Inode **Result);
    int (*RmDir)(struct Inode *Parent, const char *Name);
    int (*SymLink)(struct Inode *Parent, const char *Name, const char *Target, struct Inode **Result);
    ssize_t (*ReadLink)(struct Inode *Node, char *Buffer, size_t Size);
    off_t (*Seek)(struct Inode *Node, off_t Offset);
    int (*Stat)(struct Inode *Node, struct kstat *Stat);
} __attribute__((packed));
 
#define I_FLAG_ROOT 0x1
#define I_FLAG_MOUNTPOINT 0x2
#define I_FLAG_CACHE_KEEP 0x4
 
struct FileSystemInfo;
struct SuperBlockOperations
{
    int (*AllocateInode)(struct FileSystemInfo *Info, struct Inode **Result);
    int (*DeleteInode)(struct FileSystemInfo *Info, struct Inode *Node);
 
    int (*Synchronize)(struct FileSystemInfo *Info, struct Inode *Node);
 
    int (*Destroy)(struct FileSystemInfo *Info);
} __attribute__((packed));
 
struct FileSystemInfo
{
    const char *Name;
    const char *RootName;
    int Flags;
    struct SuperBlockOperations SuperOps;
    struct InodeOperations Ops;
 
    void *PrivateData;
} __attribute__((packed));
 
dev_t RegisterFileSystem(struct FileSystemInfo *Info, struct Inode *Root);
int UnregisterFileSystem(dev_t Device);
 
#endif // !__FENNIX_API_FILESYSTEM_H__