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preadv/pwritev: create compat_writev()

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Factor out some code from compat_sys_writev() which can be shared with the
upcoming compat_sys_pwritev().

Signed-off-by: Gerd Hoffmann <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Al Viro <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: Ralf Baechle <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Gerd Hoffmann 2009-04-02 16:59:21 -07:00 • committed by Linus Torvalds
commit 6949a6318e
1 changed files with 18 additions and 7 deletions
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25
fs/compat.c
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@ -1232,15 +1232,12 @@ compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
return ret;
}
asmlinkage ssize_t
compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
static size_t compat_writev(struct file *file,
const struct compat_iovec __user *vec,
unsigned long vlen, loff_t *pos)
{
struct file *file;
ssize_t ret = -EBADF;
file = fget(fd);
if (!file)
return -EBADF;
if (!(file->f_mode & FMODE_WRITE))
goto out;
@ -1248,12 +1245,26 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsig
if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
goto out;
ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
out:
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
asmlinkage ssize_t
compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
unsigned long vlen)
{
struct file *file;
ssize_t ret;
file = fget(fd);
if (!file)
return -EBADF;
ret = compat_writev(file, vec, vlen, &file->f_pos);
fput(file);
return ret;
}