Init

sys/tmpfs/tmp.h

@@ -0,0 +1,81 @@
+/*  @(#)tmp.h 1.1 94/10/31 SMI */
+
+/*
+ * Utility and library routines that look at directories want to
+ * `see' something like an inode.  While each tmpnode has a unique
+ * number (its memory address), the address turns out (signed long)
+ * to be unsuitable for library utilities.  The following data structure
+ * is used to allocate a (small) tmpfs index number for these purposes.
+ */
+#define	TMPIMAPNODES	128
+#define	TMPIMAPSIZE	TMPIMAPNODES/NBBY
+
+#define	MAXMNTLEN	512	/* max length of pathname tmpfs is mounted on */
+
+struct tmpimap {
+	u_char timap_bits[TMPIMAPSIZE];	/* bitmap of available index numbers */
+					/* 0 == free number */
+	struct tmpimap *timap_next;	/* ptr to more index numbers */
+};
+
+/*
+ * Temporary file system per-mount data and other random stuff
+ * There is a linked list of these things rooted at tmpfs_mountp
+ */
+
+struct tmount {
+	struct tmount	*tm_next;	/* for linked list */
+	struct vfs	*tm_vfsp;	/* filesystem's vfs struct */
+	struct tmpnode	*tm_rootnode;	/* root tmpnode */
+	u_int		tm_mntno;	/* minor # of mounted `device' */
+	struct tmpimap	tm_inomap;	/* inode allocator maps */
+	u_int		tm_direntries;	/* number of directory entries */
+	u_int		tm_directories; /* number of directories */
+	u_int		tm_files;	/* number of regular files */
+	u_int		tm_kmemspace;	/* bytes of kmem_alloc'd memory */
+	u_int		tm_anonmem;	/* bytes of anon memory actually used */
+	char 		tm_mntpath[MAXMNTLEN]; /* name of tmpfs mount point */
+
+};
+
+#ifdef KERNEL
+char *tmp_memalloc();
+void tmp_memfree();
+#define	GET_TIME(tv)		((*tv) = time)
+#define	VFSP_TO_TM(vfsp)	((struct tmount *)(vfsp)->vfs_data)
+#define	VP_TO_TM(vp)		((struct tmount *)(vp)->v_vfsp->vfs_data)
+#define	VP_TO_TN(vp)		((struct tmpnode *)(vp)->v_data)
+#endif KERNEL
+
+/*
+ * Don't allocate more anon pages for tmp files if free anon space
+ * goes under TMPHIWATER.  Hideous deadlocks can occur.  This can be
+ * patched in tmpfs_hiwater.
+ * XXX better heuristic needed
+ */
+#define	TMPHIWATER	4*1024*1024	/* ie, 4 Megabytes */
+
+/*
+ * Each tmpfs can allocate only a certain amount of kernel memory,
+ * which is used for directories (may change), anon maps, inode maps,
+ * and other goodies.  This is statically set (during first tmp_mount())
+ * as a percent of physmem.  The actual percentage can be patched in
+ * tmpfs_maxprockmem.
+ * XXX better heuristic needed
+ */
+#define	TMPMAXPROCKMEM	2		/* Means 2 procent of physical memory */
+
+/*
+ * patchable variables controlling debugging output
+ * defined in tmp_vnodeops XXX
+ */
+#define	TMPFSDEBUG 	1	/* XXX REMOVE ALL OF THESE FOR FCS!! */
+
+#ifdef TMPFSDEBUG
+extern int tmpfsdebug;		/* general debugging (e.g. function calls) */
+extern int tmpdebugerrs;	/* report non-fatal error conditions */
+extern int tmplockdebug;	/* report on tmpnode locking and unlocking */
+extern int tmpdirdebug;		/* report of file and directory manipulation */
+extern int tmprwdebug;		/* read/write debugging */
+extern int tmpdebugalloc;	/* tmpfs memory and swap allocation */
+#endif TMPFSDEBUG