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compat: Create compat_sys_p{read,write}v64

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For 32-bit ABIs which have real 64-bit registers, we don't want to
break the position argument into two.  However, we still need compat
support to deal with 32-bit pointers, so we can't just use
sys_p{read,write} directly.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. J. Lu 2012-02-14 13:30:41 -08:00 committed by H. Peter Anvin
parent ff88943a14
commit 4ee5c0d05c
1 changed files with 20 additions and 6 deletions
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26
fs/compat.c
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@ -1177,10 +1177,9 @@ compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
} }
asmlinkage ssize_t asmlinkage ssize_t
compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec, compat_sys_preadv64(unsigned long fd, const struct compat_iovec __user *vec,
unsigned long vlen, u32 pos_low, u32 pos_high) unsigned long vlen, loff_t pos)
{ {
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
struct file *file; struct file *file;
int fput_needed; int fput_needed;
ssize_t ret; ssize_t ret;
@ -1197,6 +1196,14 @@ compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
return ret; return ret;
} }
asmlinkage ssize_t
compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
unsigned long vlen, u32 pos_low, u32 pos_high)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
return compat_sys_preadv64(fd, vec, vlen, pos);
}
static size_t compat_writev(struct file *file, static size_t compat_writev(struct file *file,
const struct compat_iovec __user *vec, const struct compat_iovec __user *vec,
unsigned long vlen, loff_t *pos) unsigned long vlen, loff_t *pos)
@ -1236,10 +1243,9 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
} }
asmlinkage ssize_t asmlinkage ssize_t
compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec, compat_sys_pwritev64(unsigned long fd, const struct compat_iovec __user *vec,
unsigned long vlen, u32 pos_low, u32 pos_high) unsigned long vlen, loff_t pos)
{ {
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
struct file *file; struct file *file;
int fput_needed; int fput_needed;
ssize_t ret; ssize_t ret;
@ -1256,6 +1262,14 @@ compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
return ret; return ret;
} }
asmlinkage ssize_t
compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
unsigned long vlen, u32 pos_low, u32 pos_high)
{
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
return compat_sys_pwritev64(fd, vec, vlen, pos);
}
asmlinkage long asmlinkage long
compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
unsigned int nr_segs, unsigned int flags) unsigned int nr_segs, unsigned int flags)