mirror of https://gitee.com/openkylin/linux.git
fs: remove various compat readv/writev helpers
Now that import_iovec handles compat iovecs as well, all the duplicated code in the compat readv/writev helpers is not needed. Remove them and switch the compat syscall handlers to use the native helpers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
Al Viro
parent
89cd35c58b
commit
3523a9d454
179
fs/read_write.c
179
fs/read_write.c
|
|
@ -1068,226 +1068,107 @@ SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec,
|
|||
return do_pwritev(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
/*
|
||||
* Various compat syscalls. Note that they all pretend to take a native
|
||||
* iovec - import_iovec will properly treat those as compat_iovecs based on
|
||||
* in_compat_syscall().
|
||||
*/
|
||||
#ifdef CONFIG_COMPAT
|
||||
static size_t compat_readv(struct file *file,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, rwf_t flags)
|
||||
{
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
ret = import_iovec(READ, (const struct iovec __user *)vec, vlen,
|
||||
UIO_FASTIOV, &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
ret = do_iter_read(file, &iter, pos, flags);
|
||||
kfree(iov);
|
||||
}
|
||||
if (ret > 0)
|
||||
add_rchar(current, ret);
|
||||
inc_syscr(current);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static size_t do_compat_readv(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
compat_ulong_t vlen, rwf_t flags)
|
||||
{
|
||||
struct fd f = fdget_pos(fd);
|
||||
ssize_t ret;
|
||||
loff_t pos;
|
||||
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
pos = f.file->f_pos;
|
||||
ret = compat_readv(f.file, vec, vlen, &pos, flags);
|
||||
if (ret >= 0)
|
||||
f.file->f_pos = pos;
|
||||
fdput_pos(f);
|
||||
return ret;
|
||||
|
||||
}
|
||||
|
||||
COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
compat_ulong_t, vlen)
|
||||
{
|
||||
return do_compat_readv(fd, vec, vlen, 0);
|
||||
}
|
||||
|
||||
static long do_compat_preadv64(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos, rwf_t flags)
|
||||
{
|
||||
struct fd f;
|
||||
ssize_t ret;
|
||||
|
||||
if (pos < 0)
|
||||
return -EINVAL;
|
||||
f = fdget(fd);
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
ret = -ESPIPE;
|
||||
if (f.file->f_mode & FMODE_PREAD)
|
||||
ret = compat_readv(f.file, vec, vlen, &pos, flags);
|
||||
fdput(f);
|
||||
return ret;
|
||||
return do_readv(fd, vec, vlen, 0);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
|
||||
COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos)
|
||||
{
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, 0);
|
||||
return do_preadv(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, 0);
|
||||
return do_preadv(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
|
||||
COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos, rwf_t, flags)
|
||||
{
|
||||
if (pos == -1)
|
||||
return do_compat_readv(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, flags);
|
||||
return do_readv(fd, vec, vlen, flags);
|
||||
return do_preadv(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high,
|
||||
rwf_t, flags)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
if (pos == -1)
|
||||
return do_compat_readv(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_preadv64(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
static size_t compat_writev(struct file *file,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t *pos, rwf_t flags)
|
||||
{
|
||||
struct iovec iovstack[UIO_FASTIOV];
|
||||
struct iovec *iov = iovstack;
|
||||
struct iov_iter iter;
|
||||
ssize_t ret;
|
||||
|
||||
ret = import_iovec(WRITE, (const struct iovec __user *)vec, vlen,
|
||||
UIO_FASTIOV, &iov, &iter);
|
||||
if (ret >= 0) {
|
||||
file_start_write(file);
|
||||
ret = do_iter_write(file, &iter, pos, flags);
|
||||
file_end_write(file);
|
||||
kfree(iov);
|
||||
}
|
||||
if (ret > 0)
|
||||
add_wchar(current, ret);
|
||||
inc_syscw(current);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static size_t do_compat_writev(compat_ulong_t fd,
|
||||
const struct compat_iovec __user* vec,
|
||||
compat_ulong_t vlen, rwf_t flags)
|
||||
{
|
||||
struct fd f = fdget_pos(fd);
|
||||
ssize_t ret;
|
||||
loff_t pos;
|
||||
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
pos = f.file->f_pos;
|
||||
ret = compat_writev(f.file, vec, vlen, &pos, flags);
|
||||
if (ret >= 0)
|
||||
f.file->f_pos = pos;
|
||||
fdput_pos(f);
|
||||
return ret;
|
||||
return do_readv(fd, vec, vlen, flags);
|
||||
return do_preadv(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *, vec,
|
||||
const struct iovec __user *, vec,
|
||||
compat_ulong_t, vlen)
|
||||
{
|
||||
return do_compat_writev(fd, vec, vlen, 0);
|
||||
}
|
||||
|
||||
static long do_compat_pwritev64(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos, rwf_t flags)
|
||||
{
|
||||
struct fd f;
|
||||
ssize_t ret;
|
||||
|
||||
if (pos < 0)
|
||||
return -EINVAL;
|
||||
f = fdget(fd);
|
||||
if (!f.file)
|
||||
return -EBADF;
|
||||
ret = -ESPIPE;
|
||||
if (f.file->f_mode & FMODE_PWRITE)
|
||||
ret = compat_writev(f.file, vec, vlen, &pos, flags);
|
||||
fdput(f);
|
||||
return ret;
|
||||
return do_writev(fd, vec, vlen, 0);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
|
||||
COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos)
|
||||
{
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, 0);
|
||||
return do_pwritev(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *,vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, 0);
|
||||
return do_pwritev(fd, vec, vlen, pos, 0);
|
||||
}
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
|
||||
COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *, vec,
|
||||
unsigned long, vlen, loff_t, pos, rwf_t, flags)
|
||||
{
|
||||
if (pos == -1)
|
||||
return do_compat_writev(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, flags);
|
||||
return do_writev(fd, vec, vlen, flags);
|
||||
return do_pwritev(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
#endif
|
||||
|
||||
COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd,
|
||||
const struct compat_iovec __user *,vec,
|
||||
const struct iovec __user *,vec,
|
||||
compat_ulong_t, vlen, u32, pos_low, u32, pos_high, rwf_t, flags)
|
||||
{
|
||||
loff_t pos = ((loff_t)pos_high << 32) | pos_low;
|
||||
|
||||
if (pos == -1)
|
||||
return do_compat_writev(fd, vec, vlen, flags);
|
||||
|
||||
return do_compat_pwritev64(fd, vec, vlen, pos, flags);
|
||||
return do_writev(fd, vec, vlen, flags);
|
||||
return do_pwritev(fd, vec, vlen, pos, flags);
|
||||
}
|
||||
|
||||
#endif
|
||||
#endif /* CONFIG_COMPAT */
|
||||
|
||||
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
|
||||
size_t count, loff_t max)
|
||||
|
|
|
|||
|
|
@ -546,25 +546,25 @@ asmlinkage long compat_sys_getdents(unsigned int fd,
|
|||
/* fs/read_write.c */
|
||||
asmlinkage long compat_sys_lseek(unsigned int, compat_off_t, unsigned int);
|
||||
asmlinkage ssize_t compat_sys_readv(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec, compat_ulong_t vlen);
|
||||
const struct iovec __user *vec, compat_ulong_t vlen);
|
||||
asmlinkage ssize_t compat_sys_writev(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec, compat_ulong_t vlen);
|
||||
const struct iovec __user *vec, compat_ulong_t vlen);
|
||||
/* No generic prototype for pread64 and pwrite64 */
|
||||
asmlinkage ssize_t compat_sys_preadv(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
compat_ulong_t vlen, u32 pos_low, u32 pos_high);
|
||||
asmlinkage ssize_t compat_sys_pwritev(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
compat_ulong_t vlen, u32 pos_low, u32 pos_high);
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
|
||||
asmlinkage long compat_sys_preadv64(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos);
|
||||
#endif
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
|
||||
asmlinkage long compat_sys_pwritev64(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos);
|
||||
#endif
|
||||
|
||||
|
|
@ -800,20 +800,20 @@ asmlinkage long compat_sys_execveat(int dfd, const char __user *filename,
|
|||
const compat_uptr_t __user *argv,
|
||||
const compat_uptr_t __user *envp, int flags);
|
||||
asmlinkage ssize_t compat_sys_preadv2(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
|
||||
asmlinkage ssize_t compat_sys_pwritev2(compat_ulong_t fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
compat_ulong_t vlen, u32 pos_low, u32 pos_high, rwf_t flags);
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
|
||||
asmlinkage long compat_sys_preadv64v2(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos, rwf_t flags);
|
||||
#endif
|
||||
|
||||
#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
|
||||
asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
|
||||
const struct compat_iovec __user *vec,
|
||||
const struct iovec __user *vec,
|
||||
unsigned long vlen, loff_t pos, rwf_t flags);
|
||||
#endif
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue