111 lines
1.9 KiB
C
111 lines
1.9 KiB
C
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#ifndef __FS_O2FS_H__
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#define __FS_O2FS_H__
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/*
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* *** Disk Layout ***
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*
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* +---------------------+
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* | Super Blocks (4MBs) |
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* +---------------------+
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* | |
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* .
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* .
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* .
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* | |
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* +---------------------+
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* | Super Blocks (4MBs) |
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* +---------------------+
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*
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*/
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#define MAXUSERNAMELEN 32
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#define MAXNAMELEN 255
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/*
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* *** Version History ***
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* 1.0 Initial release
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*/
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#define O2FS_VERSION_MAJOR 1
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#define O2FS_VERSION_MINOR 0
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/*
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* Object ID: Pointer to a block node
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*/
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typedef struct ObjID {
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uint8_t hash[32];
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uint64_t device;
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uint64_t offset;
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} ObjID;
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/*
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* Super block
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*/
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typedef struct SuperBlock
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{
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uint8_t magic[8];
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uint16_t versionMajor;
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uint16_t versionMinor;
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uint32_t _rsvd0;
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uint64_t features;
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uint64_t blockCount;
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uint64_t blockSize;
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uint64_t version; /* Snapshot version */
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ObjID root; /* Root Tree */
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uint8_t hash[32];
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} SuperBlock;
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#define SUPERBLOCK_MAGIC "SUPRBLOK"
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/*
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* Block Pointer: Address raw blocks on the disk
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*/
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typedef struct BPtr {
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uint8_t hash[32];
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uint64_t device;
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uint64_t offset;
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uint64_t _rsvd0;
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uint64_t _rsvd1;
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} BPtr;
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/*
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* Block Nodes: Contain indirect pointers to pieces of a file
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*/
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typedef struct BNode
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{
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uint8_t magic[8];
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uint16_t versionMajor;
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uint16_t versionMinor;
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uint32_t flags;
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uint64_t size;
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BPtr direct[64];
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} BNode;
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#define BNODE_MAGIC "BLOKNODE"
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/*
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* Directory entries are exactly 512 bytes
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*/
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typedef struct BDirEntry
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{
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uint8_t magic[8];
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ObjID objId;
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uint64_t size;
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uint64_t flags;
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uint64_t ctime;
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uint64_t mtime;
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uint8_t user[MAXUSERNAMELEN]; // Not null terminated
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uint8_t group[MAXUSERNAMELEN];
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uint8_t padding[104];
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uint8_t name[MAXNAMELEN+1]; // Null terminated
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} BDirEntry;
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#define BDIR_MAGIC "DIRENTRY"
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#endif /* __FS_O2FS_H__ */
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