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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 <kraxel@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <linux-api@vger.kernel.org>
Cc: <linux-arch@vger.kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gerd Hoffmann 2009-04-02 16:59:21 -07:00 committed by Linus Torvalds
parent dac1213842
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; return ret;
} }
asmlinkage ssize_t static size_t compat_writev(struct file *file,
compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen) const struct compat_iovec __user *vec,
unsigned long vlen, loff_t *pos)
{ {
struct file *file;
ssize_t ret = -EBADF; ssize_t ret = -EBADF;
file = fget(fd);
if (!file)
return -EBADF;
if (!(file->f_mode & FMODE_WRITE)) if (!(file->f_mode & FMODE_WRITE))
goto out; 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)) if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
goto out; 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: out:
if (ret > 0) if (ret > 0)
add_wchar(current, ret); add_wchar(current, ret);
inc_syscw(current); 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); fput(file);
return ret; return ret;
} }