f78d8e74fd
A new call to vm lets processes yield a part of their memory to vm, together with an id, getting newly allocated memory in return. vm is allowed to forget about it if it runs out of memory. processes can ask for it back using the same id. (These two operations are normally combined in a single call.) It can be used as a as-big-as-memory-will-allow block cache for filesystems, which is how mfs now uses it.
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* EXTERN should be extern except for the table file */
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#ifdef _TABLE
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#undef EXTERN
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#define EXTERN
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#endif
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#include <minix/vfsif.h>
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EXTERN off_t rdahedpos; /* position to read ahead */
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EXTERN struct inode *rdahed_inode; /* pointer to inode to read ahead */
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/* The following variables are used for returning results to the caller. */
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EXTERN int err_code; /* temporary storage for error number */
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EXTERN int rdwt_err; /* status of last disk i/o request */
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EXTERN int cch[NR_INODES];
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extern char dot1[2]; /* dot1 (&dot1[0]) and dot2 (&dot2[0]) have a special */
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extern char dot2[3]; /* meaning to search_dir: no access permission check. */
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extern _PROTOTYPE (int (*fs_call_vec[]), (void) ); /* fs call table */
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EXTERN message fs_m_in;
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EXTERN message fs_m_out;
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EXTERN int FS_STATE;
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EXTERN vfs_ucred_t credentials;
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EXTERN uid_t caller_uid;
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EXTERN gid_t caller_gid;
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EXTERN time_t boottime; /* time in seconds at system boot */
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EXTERN int use_getuptime2; /* Should be removed togetherwith boottime */
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EXTERN int req_nr;
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EXTERN int SELF_E;
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EXTERN struct inode *chroot_dir;
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EXTERN short path_processed; /* number of characters processed */
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EXTERN char user_path[PATH_MAX+1]; /* pathname to be processed */
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EXTERN char *vfs_slink_storage;
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EXTERN int Xsymloop;
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EXTERN dev_t fs_dev; /* The device that is handled by this FS proc.
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*/
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EXTERN char fs_dev_label[16]; /* Name of the device driver that is handled
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* by this FS proc.
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*/
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EXTERN int unmountdone;
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EXTERN int exitsignaled;
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/* our block size. */
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EXTERN int fs_block_size;
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/* Buffer cache. */
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EXTERN struct buf *buf;
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EXTERN struct buf **buf_hash; /* the buffer hash table */
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EXTERN int nr_bufs;
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EXTERN int may_use_vmcache;
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