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Make the loop support stuff be much less evil, and make it cope

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with 2.6.x asm/posix_types.h, which has done singularly evil thing
by yanking __kernel_dev_t and renaming it.  The loop interface was
really poorly designed in the first place.  The new 64 bit loop
interface looks to be somewhat less horrible, too bad it is only
present in 2.6.x kernels.
 -Erik
This commit is contained in:
Eric Andersen 2004-02-06 07:16:36 +00:00
parent 7495b0d4b1
commit ef8cd3be17
4 changed files with 34 additions and 81 deletions
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6
libbb/Makefile.in
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@ -96,9 +96,3 @@ $(LIBBB_MOBJS2): $(LIBBB_MSRC2)
$(LIBBB_MOBJS3): $(LIBBB_MSRC3)
$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -DL_$(notdir $*) -c $< -o $@
$(LIBBB_DIR)loop.o: $(LIBBB_DIR)loop.h
$(LIBBB_DIR)loop.h: $(LIBBB_DIR)mk_loop_h.sh
@ $(SHELL) $< > $@

35
libbb/loop.c
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@ -26,7 +26,40 @@
#include <unistd.h>
#include <sys/ioctl.h>
#include "libbb.h"
#include "loop.h" /* Pull in loop device support */
/* Grumble... The 2.6.x kernel breaks asm/posix_types.h
* so we get to try and cope as best we can... */
#include <linux/version.h>
#include <asm/posix_types.h>
#if LINUX_VERSION_CODE >= 132608
#define __bb_kernel_dev_t __kernel_old_dev_t
#elif LINUX_VERSION_CODE >= 0x20600
#define __bb_kernel_dev_t __kernel_dev_t
#else
#define __bb_kernel_dev_t unsigned short
#endif
/* Stuff stolen from linux/loop.h */
#define LO_NAME_SIZE 64
#define LO_KEY_SIZE 32
#define LOOP_SET_FD 0x4C00
#define LOOP_CLR_FD 0x4C01
#define LOOP_SET_STATUS 0x4C02
#define LOOP_GET_STATUS 0x4C03
struct loop_info {
int lo_number;
__bb_kernel_dev_t lo_device;
unsigned long lo_inode;
__bb_kernel_dev_t lo_rdevice;
int lo_offset;
int lo_encrypt_type;
int lo_encrypt_key_size;
int lo_flags;
char lo_name[LO_NAME_SIZE];
unsigned char lo_encrypt_key[LO_KEY_SIZE];
unsigned long lo_init[2];
char reserved[4];
};
extern int del_loop(const char *device)
{

37
libbb/mk_loop_h.sh
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@ -1,37 +0,0 @@
#!/bin/sh
#
# Figure out (i) the type of dev_t (ii) the defines for loop stuff
#
# Output of this script is normally redirected to "loop.h".
# Since 1.3.79 there is an include file <asm/posix_types.h>
# that defines __kernel_dev_t.
# (The file itself appeared in 1.3.78, but there it defined __dev_t.)
# If it exists, we use it, or, rather, <linux/posix_types.h> which
# avoids namespace pollution. Otherwise we guess that __kernel_dev_t
# is an unsigned short (which is true on i386, but false on alpha).
# BUG: This test is actually broken if your gcc is not configured to
# search /usr/include, as may well happen with cross-compilers.
# It would be better to ask $(CC) if these files can be found.
if [ -f /usr/include/linux/posix_types.h ]; then
echo '#include <linux/posix_types.h>'
echo '#undef dev_t'
echo '#define dev_t __kernel_dev_t'
else
echo '#undef dev_t'
echo '#define dev_t unsigned short'
fi
# Next we have to find the loop stuff itself.
# First try kernel source, then a private version.
if [ -f /usr/include/linux/loop.h ]; then
echo '#include <linux/loop.h>'
else
echo '#include "real_loop.h"'
fi
echo '#undef dev_t'

37
libbb/real_loop.h
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@ -1,37 +0,0 @@
/*
* include/linux/loop.h
*
* Written by Theodore Ts'o, 3/29/93.
*
* Copyright 1993 by Theodore Ts'o. Redistribution of this file is
* permitted under the GNU Public License.
*/
#define LO_NAME_SIZE 64
#define LO_KEY_SIZE 32
struct loop_info {
int lo_number; /* ioctl r/o */
dev_t lo_device; /* ioctl r/o */
unsigned long lo_inode; /* ioctl r/o */
dev_t lo_rdevice; /* ioctl r/o */
int lo_offset;
int lo_encrypt_type;
int lo_encrypt_key_size; /* ioctl w/o */
int lo_flags; /* ioctl r/o */
char lo_name[LO_NAME_SIZE];
unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
unsigned long lo_init[2];
char reserved[4];
};
#define LO_CRYPT_NONE 0
#define LO_CRYPT_XOR 1
#define LO_CRYPT_DES 2
#define LO_CRYPT_IDEA 3
#define MAX_LO_CRYPT 4
#define LOOP_SET_FD 0x4C00
#define LOOP_CLR_FD 0x4C01
#define LOOP_SET_STATUS 0x4C02
#define LOOP_GET_STATUS 0x4C03