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Subject[PATCH][COMPAT] compat_sys_fcntl{,64} 1/9 Generic part
Hi all,

This is my first pass at compat_sys_fcntl and compat_sys_fcntl64.

I am hoping it is OK with everyone.

This is just the generic part of the patch, arch's to follow.

As a side effect, this allows the removal of struct flock64 from all
the 64 bit architectures.
--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/

diff -ruN 2.5.63-32bit.1/fs/compat.c 2.5.63-32bit.2/fs/compat.c
--- 2.5.63-32bit.1/fs/compat.c 2003-01-14 09:57:57.000000000 +1100
+++ 2.5.63-32bit.2/fs/compat.c 2003-02-25 14:35:59.000000000 +1100
@@ -75,36 +75,6 @@
return error;
}

-int get_compat_flock(struct flock *kfl, struct compat_flock *ufl)
-{
- int err;
-
- if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)))
- return -EFAULT;
-
- err = __get_user(kfl->l_type, &ufl->l_type);
- err |= __get_user(kfl->l_whence, &ufl->l_whence);
- err |= __get_user(kfl->l_start, &ufl->l_start);
- err |= __get_user(kfl->l_len, &ufl->l_len);
- err |= __get_user(kfl->l_pid, &ufl->l_pid);
- return err;
-}
-
-int put_compat_flock(struct flock *kfl, struct compat_flock *ufl)
-{
- int err;
-
- if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)))
- return -EFAULT;
-
- err = __put_user(kfl->l_type, &ufl->l_type);
- err |= __put_user(kfl->l_whence, &ufl->l_whence);
- err |= __put_user(kfl->l_start, &ufl->l_start);
- err |= __put_user(kfl->l_len, &ufl->l_len);
- err |= __put_user(kfl->l_pid, &ufl->l_pid);
- return err;
-}
-
static int put_compat_statfs(struct compat_statfs *ubuf, struct statfs *kbuf)
{
if (verify_area(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
@@ -159,3 +129,120 @@
out:
return error;
}
+
+static int get_compat_flock(struct flock *kfl, struct compat_flock *ufl)
+{
+ if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
+ __get_user(kfl->l_type, &ufl->l_type) ||
+ __get_user(kfl->l_whence, &ufl->l_whence) ||
+ __get_user(kfl->l_start, &ufl->l_start) ||
+ __get_user(kfl->l_len, &ufl->l_len) ||
+ __get_user(kfl->l_pid, &ufl->l_pid))
+ return -EFAULT;
+ return 0;
+}
+
+static int put_compat_flock(struct flock *kfl, struct compat_flock *ufl)
+{
+ if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
+ __put_user(kfl->l_type, &ufl->l_type) ||
+ __put_user(kfl->l_whence, &ufl->l_whence) ||
+ __put_user(kfl->l_start, &ufl->l_start) ||
+ __put_user(kfl->l_len, &ufl->l_len) ||
+ __put_user(kfl->l_pid, &ufl->l_pid))
+ return -EFAULT;
+ return 0;
+}
+
+static int get_compat_flock64(struct flock *kfl, struct compat_flock64 *ufl)
+{
+ if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
+ __get_user(kfl->l_type, &ufl->l_type) ||
+ __get_user(kfl->l_whence, &ufl->l_whence) ||
+ __get_user(kfl->l_start, &ufl->l_start) ||
+ __get_user(kfl->l_len, &ufl->l_len) ||
+ __get_user(kfl->l_pid, &ufl->l_pid))
+ return -EFAULT;
+ return 0;
+}
+
+static int put_compat_flock64(struct flock *kfl, struct compat_flock64 *ufl)
+{
+ if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
+ __put_user(kfl->l_type, &ufl->l_type) ||
+ __put_user(kfl->l_whence, &ufl->l_whence) ||
+ __put_user(kfl->l_start, &ufl->l_start) ||
+ __put_user(kfl->l_len, &ufl->l_len) ||
+ __put_user(kfl->l_pid, &ufl->l_pid))
+ return -EFAULT;
+ return 0;
+}
+
+extern asmlinkage long sys_fcntl(unsigned int, unsigned int, unsigned long);
+
+asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
+ unsigned long arg)
+{
+ mm_segment_t old_fs;
+ struct flock f;
+ long ret;
+
+ switch (cmd) {
+ case F_GETLK:
+ case F_SETLK:
+ case F_SETLKW:
+ ret = get_compat_flock(&f, (struct compat_flock *)arg);
+ if (ret != 0)
+ break;
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = sys_fcntl(fd, cmd, (unsigned long)&f);
+ set_fs(old_fs);
+ if ((cmd == F_GETLK) && (ret == 0)) {
+ if ((f.l_start >= COMPAT_OFF_T_MAX) ||
+ ((f.l_start + f.l_len) >= COMPAT_OFF_T_MAX))
+ ret = -EOVERFLOW;
+ if (ret == 0)
+ ret = put_compat_flock(&f,
+ (struct compat_flock *)arg);
+ }
+ break;
+
+ case F_GETLK64:
+ case F_SETLK64:
+ case F_SETLKW64:
+ ret = get_compat_flock64(&f, (struct compat_flock64 *)arg);
+ if (ret != 0)
+ break;
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = sys_fcntl(fd, F_GETLK, (unsigned long)&f);
+ ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
+ ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
+ (unsigned long)&f);
+ set_fs(old_fs);
+ if ((cmd == F_GETLK64) && (ret == 0)) {
+ if ((f.l_start >= COMPAT_LOFF_T_MAX) ||
+ ((f.l_start + f.l_len) >= COMPAT_LOFF_T_MAX))
+ ret = -EOVERFLOW;
+ if (ret == 0)
+ ret = put_compat_flock64(&f,
+ (struct compat_flock64 *)arg);
+ }
+ break;
+
+ default:
+ ret = sys_fcntl(fd, cmd, arg);
+ break;
+ }
+ return ret;
+}
+
+asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
+ unsigned long arg)
+{
+ if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
+ return -EINVAL;
+ return compat_sys_fcntl64(fd, cmd, arg);
+}
+
diff -ruN 2.5.63-32bit.1/include/linux/compat.h 2.5.63-32bit.2/include/linux/compat.h
--- 2.5.63-32bit.1/include/linux/compat.h 2003-01-17 14:01:07.000000000 +1100
+++ 2.5.63-32bit.2/include/linux/compat.h 2003-02-25 14:36:00.000000000 +1100
@@ -10,7 +10,6 @@

#include <linux/stat.h>
#include <linux/param.h> /* for HZ */
-#include <linux/fcntl.h> /* for struct flock */
#include <asm/compat.h>

#define compat_jiffies_to_clock_t(x) \
@@ -40,8 +39,6 @@
} compat_sigset_t;

extern int cp_compat_stat(struct kstat *, struct compat_stat *);
-extern int get_compat_flock(struct flock *, struct compat_flock *);
-extern int put_compat_flock(struct flock *, struct compat_flock *);
extern int get_compat_timespec(struct timespec *, struct compat_timespec *);
extern int put_compat_timespec(struct timespec *, struct compat_timespec *);

diff -ruN 2.5.63-32bit.1/include/linux/fs.h 2.5.63-32bit.2/include/linux/fs.h
--- 2.5.63-32bit.1/include/linux/fs.h 2003-02-25 12:59:59.000000000 +1100
+++ 2.5.63-32bit.2/include/linux/fs.h 2003-02-25 14:36:00.000000000 +1100
@@ -525,8 +525,10 @@
extern int fcntl_getlk(struct file *, struct flock *);
extern int fcntl_setlk(struct file *, unsigned int, struct flock *);

+#if BITS_PER_LONG == 32
extern int fcntl_getlk64(struct file *, struct flock64 *);
extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 *);
+#endif

/* fs/locks.c */
extern void locks_init_lock(struct file_lock *);
-
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