include/minix/libminixfs.h

   1 /* Prototypes for -lminixfs. */
   2
   3 #ifndef _MINIX_FSLIB_H
   4 #define _MINIX_FSLIB_H
   5
   6 #include <minix/safecopies.h>
   7 #include <minix/sef.h>
   8 #include <minix/vfsif.h>
   9
  10 struct buf {
  11   /* Data portion of the buffer. */
  12   void *data;
  13
  14   /* Header portion of the buffer - internal to libminixfs. */
  15   struct buf *lmfs_next;       /* used to link all free bufs in a chain */
  16   struct buf *lmfs_prev;       /* used to link all free bufs the other way */
  17   struct buf *lmfs_hash;       /* used to link bufs on hash chains */
  18   block_t lmfs_blocknr;        /* block number of its (minor) device */
  19   dev_t lmfs_dev;              /* major | minor device where block resides */
  20   char lmfs_dirt;              /* BP_CLEAN or BP_DIRTY */
  21   char lmfs_count;             /* number of users of this buffer */
  22   unsigned int lmfs_bytes;     /* Number of bytes allocated in bp */
  23 };
  24
  25 int fs_lookup_credentials(vfs_ucred_t *credentials,
  26         uid_t *caller_uid, gid_t *caller_gid, cp_grant_id_t grant2, size_t cred_size);
  27 u32_t fs_bufs_heuristic(int minbufs, u32_t btotal, u32_t bfree,
  28         int blocksize, dev_t majordev);
  29
  30 void lmfs_markdirty(struct buf *bp);
  31 void lmfs_markclean(struct buf *bp);
  32 int lmfs_isclean(struct buf *bp);
  33 dev_t lmfs_dev(struct buf *bp);
  34 int lmfs_bytes(struct buf *bp);
  35 int lmfs_bufs_in_use(void);
  36 int lmfs_nr_bufs(void);
  37 void lmfs_flushall(void);
  38 int lmfs_fs_block_size(void);
  39 void lmfs_may_use_vmcache(int);
  40 void lmfs_set_blocksize(int blocksize, int major);
  41 void lmfs_reset_rdwt_err(void);
  42 int lmfs_rdwt_err(void);
  43 void lmfs_buf_pool(int new_nr_bufs);
  44 struct buf *lmfs_get_block(dev_t dev, block_t block,int only_search);
  45 void lmfs_invalidate(dev_t device);
  46 void lmfs_put_block(struct buf *bp, int block_type);
  47 void lmfs_rw_scattered(dev_t, struct buf **, int, int);
  48
  49 /* calls that libminixfs does into fs */
  50 void fs_blockstats(u32_t *blocks, u32_t *free, u32_t *used);
  51 int fs_sync(void);
  52
  53 /* get_block arguments */
  54 #define NORMAL             0    /* forces get_block to do disk read */
  55 #define NO_READ            1    /* prevents get_block from doing disk read */
  56 #define PREFETCH           2    /* tells get_block not to read or mark dev */
  57
  58 /* When a block is released, the type of usage is passed to put_block(). */
  59 #define ONE_SHOT      0200 /* set if block not likely to be needed soon */
  60
  61 #define INODE_BLOCK        0                             /* inode block */
  62 #define DIRECTORY_BLOCK    1                             /* directory block */
  63 #define INDIRECT_BLOCK     2                             /* pointer block */
  64 #define MAP_BLOCK          3                             /* bit map */
  65 #define FULL_DATA_BLOCK    5                             /* data, fully used */
  66 #define PARTIAL_DATA_BLOCK 6                             /* data, partly used*/
  67
  68 #define END_OF_FILE   (-104)        /* eof detected */
  69
  70 #endif /* _MINIX_FSLIB_H */
  71