139 lines
No EOL
4.5 KiB
C
139 lines
No EOL
4.5 KiB
C
/**
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* \file stupidfs.h
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*
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* StupidFS
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* ```
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* ┌──────────┬───────────┬──────┬───┬──────┬────┬───┬────┐
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* │Boot block│Super block│Inodes│...│Inodes│Data│...│Data│
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* └──────────┴───────────┴──────┴───┴──────┴────┴───┴────┘
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* ```
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*/
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#ifndef STPDFS_H
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# define STPDFS_H 1
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# ifndef __KERNEL__
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# include <stdint.h>
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# include <stddef.h>
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# endif
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# define STPDFS_SB_MAGIC 0x44505453
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# define STPDFS_SB_REV STPDFS_SB_REV_1
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# define STPDFS_SB_REV_1 1
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# define STPDFS_INO_ROOTDIR 1
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# define STPDFS_BLOCK_SIZE 512
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# define STPDFS_NAME_MAX 28
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# define STPDFS_INODES_PER_BLOCK (STPDFS_BLOCK_SIZE / (sizeof(struct stpdfs_inode)))
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# define STPDFS_ZONES_PER_BLOCK (STPDFS_BLOCK_SIZE / sizeof(uint32_t))
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# define STPDFS_DIRENT_PER_BLOCK (STPDFS_BLOCK_SIZE / (sizeof(struct stpdfs_dirent)))
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# define STPDFS_NDIR 7
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# define STPDFS_ROOT_INO 1
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# define STPDFS_INO_FLAG_ALOC (1 << 15)
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# define STPDFS_INO_FLAG_LZP (1 << 1)
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# define STPDFS_INO_FLAG_ENC (1 << 2)
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# define STPDFS_S_IFMT 0xF000
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# define STPDFS_S_IFSOCK 0xA000
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# define STPDFS_S_IFLNK 0xC000
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# define STPDFS_S_IFREG 0x8000
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# define STPDFS_S_IFBLK 0x6000
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# define STPDFS_S_IFDIR 0x4000
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# define STPDFS_S_ISUID 0x0800
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# define STPDFS_S_ISGID 0x0400
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# define STPDFS_S_ISVTX 0x0200
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# define STPDFS_S_IRWXU 0x01C0
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# define STPDFS_S_IRUSR 0x0100
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# define STPDFS_S_IWUSR 0x0080
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# define STPDFS_S_IXUSR 0x0040
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# define STPDFS_S_IRWXG 0x0038
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# define STPDFS_S_IRGRP 0x0020
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# define STPDFS_S_IWGRP 0x0010
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# define STPDFS_S_IXGRP 0x0008
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# define STPDFS_S_IRWXO 0x0007
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# define STPDFS_S_IROTH 0x0004
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# define STPDFS_S_IWOTH 0x0002
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# define STPDFS_S_IXOTH 0x0001
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/**
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* \brief free block list
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* ```
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* ┌──────────┐
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* │ block 99 │
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* ├──────────┤
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* │ block 98 │
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* ├──────────┤
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* │ ... │
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* ├──────────┤
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* │ block 2 │
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* ├──────────┤
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* │ block 1 │
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* ├──────────┤ ┌──────────┐
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* │ block 0 ├───►│ block 99 │
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* └──────────┘ ├──────────┤
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* │ ... │
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* ├──────────┤ ┌──────────┐
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* │ block 0 ├──►│ block 99 │
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* └──────────┘ ├──────────┤
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* │ ... │
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* ├──────────┤
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* │ block 0 │
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* └──────────┘
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* ```
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*/
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struct stpdfs_free {
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uint32_t free[100];
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uint8_t nfree;
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} __attribute__((packed));
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enum stpdfs_state {
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STPDFS_CLEANLY_UNMOUNTED = 0,
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STPDFS_ERROR = 1,
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STPDFS_DIRTY = 1,
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};
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/**
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* \brief StupidFS Superblock
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*/
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struct stpdfs_sb {
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uint32_t magic; /**< MUST be \ref STPDFS_SB_MAGIC */
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uint32_t isize; /**< size in block of the I list */
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uint32_t fsize; /**< size in block of the entire volume */
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struct stpdfs_free freelist; /**< \see stpdfs_free */
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uint8_t revision; /**< MUST be \ref STPDFS_SB_REV */
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uint16_t state; /**< \see stpdfs_state */
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uint64_t time; /**< last time the superblock was modified */
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} __attribute__((packed));
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#define STPDFS_SB_SIZE sizeof(struct stpdfs_sb)
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/**
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* \brief StupidFS I-node
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*/
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struct stpdfs_inode {
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uint16_t mode; /**< file mode */
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uint16_t nlink; /**< link count */
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uint16_t uid; /**< owner user id */
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uint16_t gid; /**< group id */
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uint16_t flags;
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uint32_t size;
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uint32_t zones[10];
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uint64_t actime;
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uint64_t modtime;
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} __attribute__((packed));
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#define STPDFS_INODE_SIZE sizeof(struct inode)
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struct stpdfs_dirent {
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uint32_t inode;
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char filename[STPDFS_NAME_MAX];
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};
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#define STPDFS_DIRENT_SIZE sizeof(struct stpdfs_dirent)
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#endif /* !STPDFS_H */ |