4472b590c7
This patch changes the prefetch API so that file systems must now provide a set of block numbers, rather than a set of buffers. The result is a leaner and more well-defined API; linear computation of the range of blocks to prefetch; duplicates no longer interfering with the prefetch process; guaranteed inclusion of the block needed next into the prefetch range; and, limits and policy decisions better established by libminixfs now actually being moved into libminixfs. Change-Id: I7e44daf2d2d164bc5e2f1473ad717f3ff0f0a77f
66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/* Prototypes for -lminixfs. */
|
|
|
|
#ifndef _MINIX_FSLIB_H
|
|
#define _MINIX_FSLIB_H
|
|
|
|
#include <minix/fsdriver.h>
|
|
|
|
/* Maximum number of blocks that will be considered by lmfs_prefetch() */
|
|
#define LMFS_MAX_PREFETCH NR_IOREQS
|
|
|
|
struct buf {
|
|
/* Data portion of the buffer. */
|
|
void *data;
|
|
|
|
/* Header portion of the buffer - internal to libminixfs. */
|
|
struct buf *lmfs_next; /* used to link all free bufs in a chain */
|
|
struct buf *lmfs_prev; /* used to link all free bufs the other way */
|
|
struct buf *lmfs_hash; /* used to link bufs on hash chains */
|
|
dev_t lmfs_dev; /* major | minor device where block resides */
|
|
block64_t lmfs_blocknr; /* block number of its (minor) device */
|
|
char lmfs_count; /* number of users of this buffer */
|
|
char lmfs_needsetcache; /* to be identified to VM */
|
|
size_t lmfs_bytes; /* size of this block (allocated and used) */
|
|
u32_t lmfs_flags; /* Flags shared between VM and FS */
|
|
|
|
/* If any, which inode & offset does this block correspond to?
|
|
* If none, VMC_NO_INODE
|
|
*/
|
|
ino_t lmfs_inode;
|
|
u64_t lmfs_inode_offset;
|
|
};
|
|
|
|
void lmfs_markdirty(struct buf *bp);
|
|
void lmfs_markclean(struct buf *bp);
|
|
int lmfs_isclean(struct buf *bp);
|
|
void lmfs_flushall(void);
|
|
void lmfs_flushdev(dev_t dev);
|
|
size_t lmfs_fs_block_size(void);
|
|
void lmfs_may_use_vmcache(int);
|
|
void lmfs_set_blocksize(size_t blocksize);
|
|
void lmfs_buf_pool(int new_nr_bufs);
|
|
int lmfs_get_block(struct buf **bpp, dev_t dev, block64_t block, int how);
|
|
int lmfs_get_block_ino(struct buf **bpp, dev_t dev, block64_t block, int how,
|
|
ino_t ino, u64_t off);
|
|
void lmfs_put_block(struct buf *bp);
|
|
void lmfs_free_block(dev_t dev, block64_t block);
|
|
void lmfs_zero_block_ino(dev_t dev, ino_t ino, u64_t off);
|
|
void lmfs_invalidate(dev_t device);
|
|
void lmfs_prefetch(dev_t dev, const block64_t *blockset, unsigned int nblocks);
|
|
void lmfs_setquiet(int q);
|
|
void lmfs_set_blockusage(fsblkcnt_t btotal, fsblkcnt_t bused);
|
|
void lmfs_change_blockusage(int delta);
|
|
|
|
/* get_block arguments */
|
|
#define NORMAL 0 /* forces get_block to do disk read */
|
|
#define NO_READ 1 /* prevents get_block from doing disk read */
|
|
#define PEEK 2 /* returns ENOENT if not in cache */
|
|
|
|
/* Block I/O helper functions. */
|
|
void lmfs_driver(dev_t dev, char *label);
|
|
ssize_t lmfs_bio(dev_t dev, struct fsdriver_data *data, size_t bytes,
|
|
off_t pos, int call);
|
|
void lmfs_bflush(dev_t dev);
|
|
|
|
#endif /* _MINIX_FSLIB_H */
|