49eb1f4806
Primary purpose of change: to support the mmap implementation, VM must know both (a) about some block metadata for FS cache blocks, i.e. inode numbers and inode offsets where applicable; and (b) know about *all* cache blocks, i.e. also of the FS primary caches and not just the blocks that spill into the secondary one. This changes the interface and VM data structures. This change is only for the interface (libminixfs) and VM data structures; the filesystem code is unmodified, so although the secondary cache will be used as normal, blocks will not be annotated with inode information until the FS is modified to provide this information. Until it is modified, mmap of files will fail gracefully on such filesystems. This is indicated to VFS/VM by returning ENOSYS for REQ_PEEK. Change-Id: I1d2df6c485e6c5e89eb28d9055076cc02629594e
83 lines
3.1 KiB
C
83 lines
3.1 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/safecopies.h>
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#include <minix/sef.h>
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#include <minix/vfsif.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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block_t lmfs_blocknr; /* block number of its (minor) device */
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dev_t lmfs_dev; /* major | minor device where block resides */
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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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int fs_lookup_credentials(vfs_ucred_t *credentials,
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uid_t *caller_uid, gid_t *caller_gid, cp_grant_id_t grant2, size_t cred_size);
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u32_t fs_bufs_heuristic(int minbufs, u32_t btotal, u32_t bfree,
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int blocksize, dev_t majordev);
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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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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, block_t block,int only_search);
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struct buf *lmfs_get_block_ino(dev_t dev, block_t block,int only_search,
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ino_t ino, u64_t off);
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void lmfs_invalidate(dev_t device);
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void lmfs_put_block(struct buf *bp, int block_type);
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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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int lmfs_do_bpeek(message *);
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/* calls that libminixfs does into fs */
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void fs_blockstats(u32_t *blocks, u32_t *free, u32_t *used);
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int fs_sync(void);
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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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/* 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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#endif /* _MINIX_FSLIB_H */
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