patch-2.1.78 linux/include/linux/hfs_sysdep.h

• Lines: 225
• Date: Mon Jan 5 16:12:14 1998
• Orig file: v2.1.77/linux/include/linux/hfs_sysdep.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.77/linux/include/linux/hfs_sysdep.h linux/include/linux/hfs_sysdep.h
@@ -0,0 +1,224 @@
+/*
+ * linux/include/linux/hfs_sysdep.h
+ *
+ * Copyright (C) 1996-1997  Paul H. Hargrove
+ * This file may be distributed under the terms of the GNU Public License.
+ *
+ * This file contains constants, types and inline
+ * functions for various system dependent things.
+ *
+ * "XXX" in a comment is a note to myself to consider changing something.
+ *
+ * In function preconditions the term "valid" applied to a pointer to
+ * a structure means that the pointer is non-NULL and the structure it
+ * points to has all fields initialized to consistent values.
+ */
+
+#ifndef _HFS_SYSDEP_H
+#define _HFS_SYSDEP_H
+
+#include <linux/malloc.h>
+#include <linux/types.h>
+#include <linux/locks.h>
+#include <linux/fs.h>
+
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+
+#undef offsetof
+#define offsetof(TYPE, MEMB) ((size_t) &((TYPE *)0)->MEMB)
+
+/* Typedefs for integer types by size and signedness */
+typedef __u8            hfs_u8;
+typedef __u16           hfs_u16;
+typedef __u32           hfs_u32;
+typedef __s8            hfs_s8;
+typedef __s16           hfs_s16;
+typedef __s32           hfs_s32;
+
+/* Typedefs for unaligned integer types */
+typedef unsigned char hfs_byte_t;
+typedef unsigned char hfs_word_t[2];
+typedef unsigned char hfs_lword_t[4];
+
+/* these funny looking things are GCC variable argument macros */
+#define hfs_warn(format, args...) printk(KERN_WARNING format , ## args)
+#define hfs_error(format, args...) printk(KERN_ERR format , ## args)
+
+
+#if defined(DEBUG_ALL) || defined(DEBUG_MEM)
+extern long int hfs_alloc;
+#endif
+
+extern inline void *hfs_malloc(unsigned int size) {
+#if defined(DEBUG_ALL) || defined(DEBUG_MEM)
+	hfs_warn("%ld bytes allocation at %s:%u\n",
+		 (hfs_alloc += size), __FILE__, __LINE__);
+#endif
+	return kmalloc(size, GFP_KERNEL);
+}
+
+extern inline void hfs_free(void *ptr, unsigned int size) {
+	kfree_s(ptr, size);
+#if defined(DEBUG_ALL) || defined(DEBUG_MEM)
+	hfs_warn("%ld bytes allocation at %s:%u\n",
+		  (hfs_alloc -= ptr ? size : 0), __FILE__, __LINE__);
+#endif
+}
+
+
+extern inline hfs_u32 hfs_time(void) {
+	return htonl(CURRENT_TIME+2082844800U);
+}
+
+
+/*
+ * hfs_wait_queue 
+ */
+typedef struct wait_queue *hfs_wait_queue;
+
+extern inline void hfs_sleep_on(hfs_wait_queue *queue) {
+	sleep_on(queue);
+}
+
+extern inline void hfs_wake_up(hfs_wait_queue *queue) {
+	wake_up(queue);
+}
+
+extern inline void hfs_relinquish(void) {
+	schedule();
+}
+
+
+/*
+ * hfs_sysmdb 
+ */
+typedef struct super_block *hfs_sysmdb;
+
+extern inline void hfs_mdb_dirty(hfs_sysmdb sys_mdb) {
+	sys_mdb->s_dirt = 1;
+}
+
+extern inline char *hfs_mdb_name(hfs_sysmdb sys_mdb) {
+	return kdevname(sys_mdb->s_dev);
+}
+
+
+/*
+ * hfs_sysentry
+ */
+typedef struct dentry *hfs_sysentry[4];
+
+/*
+ * hfs_buffer
+ */
+typedef struct buffer_head *hfs_buffer;
+
+#define HFS_BAD_BUFFER NULL
+
+/* In sysdep.c, since it needs HFS_SECTOR_SIZE */
+extern hfs_buffer hfs_buffer_get(hfs_sysmdb, int, int);
+
+extern inline int hfs_buffer_ok(hfs_buffer buffer) {
+	return (buffer != NULL);
+}
+
+extern inline void hfs_buffer_put(hfs_buffer buffer) {
+	brelse(buffer);
+}
+
+extern inline void hfs_buffer_dirty(hfs_buffer buffer) {
+	mark_buffer_dirty(buffer, 1);
+}
+
+extern inline void hfs_buffer_sync(hfs_buffer buffer) {
+	while (buffer_locked(buffer)) {
+		wait_on_buffer(buffer);
+	}
+	if (buffer_dirty(buffer)) {
+		ll_rw_block(WRITE, 1, &buffer);
+		wait_on_buffer(buffer);
+	}
+}
+
+extern inline void *hfs_buffer_data(const hfs_buffer buffer) {
+	return buffer->b_data;
+}
+
+
+/*
+ * bit operations
+ */
+
+#undef BITNR
+#if defined(__BIG_ENDIAN)
+#	define BITNR(X)	((X)^31)
+#	if !defined(__constant_htonl)
+#		define __constant_htonl(x) (x)
+#	endif
+#	if !defined(__constant_htons)
+#		define __constant_htons(x) (x)
+#	endif
+#elif defined(__LITTLE_ENDIAN)
+#	define BITNR(X)	((X)^7)
+#	if !defined(__constant_htonl)
+#		define __constant_htonl(x) \
+        ((unsigned long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
+                             (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
+                             (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
+                             (((unsigned long int)(x) & 0xff000000U) >> 24)))
+#	endif
+#	if !defined(__constant_htons)
+#		define __constant_htons(x) \
+        ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
+                              (((unsigned short int)(x) & 0xff00) >> 8)))
+#	endif
+#else
+#	error "Don't know if bytes are big- or little-endian!"
+#endif
+
+extern inline int hfs_clear_bit(int bitnr, hfs_u32 *lword) {
+	return test_and_clear_bit(BITNR(bitnr), lword);
+}
+
+extern inline int hfs_set_bit(int bitnr, hfs_u32 *lword) {
+	return test_and_set_bit(BITNR(bitnr), lword);
+}
+
+extern inline int hfs_test_bit(int bitnr, const hfs_u32 *lword) {
+	/* the kernel should declare the second arg of test_bit as const */
+	return test_bit(BITNR(bitnr), (void *)lword);
+}
+
+#undef BITNR
+
+/*
+ * HFS structures have fields aligned to 16-bit boundaries.
+ * So, 16-bit get/put are easy while 32-bit get/put need
+ * some care on architectures like the DEC Alpha.
+ *
+ * In what follows:
+ *	ns  = 16-bit integer in network byte-order w/ 16-bit alignment
+ *	hs  = 16-bit integer in host byte-order w/ 16-bit alignment
+ *	nl  = 32-bit integer in network byte-order w/ unknown alignment
+ *	hl  = 32-bit integer in host byte-order w/ unknown alignment
+ *	anl = 32-bit integer in network byte-order w/ 32-bit alignment
+ *	ahl = 32-bit integer in host byte-order w/ 32-bit alignment
+ * Example: hfs_get_hl() gets an unaligned 32-bit integer converting
+ *	it to host byte-order.
+ */
+#define hfs_get_hs(addr)	ntohs(*((hfs_u16 *)(addr)))
+#define hfs_get_ns(addr)	(*((hfs_u16 *)(addr)))
+#define hfs_get_hl(addr)	ntohl(get_unaligned((hfs_u32 *)(addr)))
+#define hfs_get_nl(addr)	get_unaligned((hfs_u32 *)(addr))
+#define hfs_get_ahl(addr)	ntohl(*((hfs_u32 *)(addr)))
+#define hfs_get_anl(addr)	(*((hfs_u32 *)(addr)))
+#define hfs_put_hs(val, addr) 	((void)(*((hfs_u16 *)(addr)) = ntohs(val)))
+#define hfs_put_ns(val, addr) 	((void)(*((hfs_u16 *)(addr)) = (val)))
+#define hfs_put_hl(val, addr) 	put_unaligned(htonl(val), (hfs_u32 *)(addr))
+#define hfs_put_nl(val, addr) 	put_unaligned((val), (hfs_u32 *)(addr))
+#define hfs_put_ahl(val, addr) 	((void)(*((hfs_u32 *)(addr)) = ntohl(val)))
+#define hfs_put_anl(val, addr) 	((void)(*((hfs_u32 *)(addr)) = (val)))
+
+#endif