cb9453ca63
With this change, the lmfs_get_block*(3) functions allow the caller to specify that it only wants the block if it is in the cache or the secondary VM cache. If the block is not found there, the functions return NULL. Previously, the PREFETCH method would be used to this end instead, which was both abuse in name and less efficient. Change-Id: Ieb5a15b67fa25d2008a8eeef9d126ac908fc2395
85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
/* Prototypes for -lminixfs. */
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#ifndef _MINIX_FSLIB_H
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#define _MINIX_FSLIB_H
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#include <minix/fsdriver.h>
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struct buf {
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/* Data portion of the buffer. */
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void *data;
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/* Header portion of the buffer - internal to libminixfs. */
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struct buf *lmfs_next; /* used to link all free bufs in a chain */
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struct buf *lmfs_prev; /* used to link all free bufs the other way */
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struct buf *lmfs_hash; /* used to link bufs on hash chains */
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dev_t lmfs_dev; /* major | minor device where block resides */
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block64_t lmfs_blocknr; /* block number of its (minor) device */
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char lmfs_count; /* number of users of this buffer */
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char lmfs_needsetcache; /* to be identified to VM */
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unsigned int lmfs_bytes; /* Number of bytes allocated in bp */
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u32_t lmfs_flags; /* Flags shared between VM and FS */
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/* If any, which inode & offset does this block correspond to?
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* If none, VMC_NO_INODE
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*/
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ino_t lmfs_inode;
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u64_t lmfs_inode_offset;
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};
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void lmfs_markdirty(struct buf *bp);
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void lmfs_markclean(struct buf *bp);
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int lmfs_isclean(struct buf *bp);
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dev_t lmfs_dev(struct buf *bp);
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int lmfs_bytes(struct buf *bp);
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int lmfs_bufs_in_use(void);
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int lmfs_nr_bufs(void);
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void lmfs_flushall(void);
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void lmfs_flushdev(dev_t dev);
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int lmfs_fs_block_size(void);
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void lmfs_may_use_vmcache(int);
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void lmfs_set_blocksize(int blocksize, int major);
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void lmfs_reset_rdwt_err(void);
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int lmfs_rdwt_err(void);
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void lmfs_buf_pool(int new_nr_bufs);
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struct buf *lmfs_get_block(dev_t dev, block64_t block, int how);
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struct buf *lmfs_get_block_ino(dev_t dev, block64_t block, int how, ino_t ino,
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u64_t off);
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void lmfs_put_block(struct buf *bp, int block_type);
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void lmfs_free_block(dev_t dev, block64_t block);
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void lmfs_zero_block_ino(dev_t dev, ino_t ino, u64_t off);
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void lmfs_invalidate(dev_t device);
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void lmfs_rw_scattered(dev_t, struct buf **, int, int);
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void lmfs_setquiet(int q);
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void lmfs_cache_reevaluate(dev_t dev);
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void lmfs_blockschange(dev_t dev, int delta);
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/* calls that libminixfs does into fs */
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void fs_blockstats(u64_t *blocks, u64_t *free, u64_t *used);
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/* get_block arguments */
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#define NORMAL 0 /* forces get_block to do disk read */
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#define NO_READ 1 /* prevents get_block from doing disk read */
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#define PREFETCH 2 /* tells get_block not to read or mark dev */
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#define PEEK 3 /* returns NULL if not in cache or VM cache */
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/* When a block is released, the type of usage is passed to put_block(). */
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#define ONE_SHOT 0200 /* set if block not likely to be needed soon */
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#define INODE_BLOCK 0 /* inode block */
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#define DIRECTORY_BLOCK 1 /* directory block */
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#define INDIRECT_BLOCK 2 /* pointer block */
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#define MAP_BLOCK 3 /* bit map */
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#define FULL_DATA_BLOCK 5 /* data, fully used */
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#define PARTIAL_DATA_BLOCK 6 /* data, partly used*/
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#define END_OF_FILE (-104) /* eof detected */
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/* Block I/O helper functions. */
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void lmfs_driver(dev_t dev, char *label);
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ssize_t lmfs_bio(dev_t dev, struct fsdriver_data *data, size_t bytes,
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off_t pos, int call);
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void lmfs_bflush(dev_t dev);
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#endif /* _MINIX_FSLIB_H */
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