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uio: make import_iovec()/compat_import_iovec() return bytes on success

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Currently these functions return < 0 on error, and 0 for success.
Change that so that we return < 0 on error, but number of bytes
for success.

Some callers already treat the return value that way, others need a
slight tweak.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2019-05-14 16:02:22 -06:00
commit 87e5e6dab6
7 changed files with 31 additions and 27 deletions
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3
net/compat.c
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@ -80,9 +80,10 @@ int get_compat_msghdr(struct msghdr *kmsg,
kmsg->msg_iocb = NULL;
return compat_import_iovec(save_addr ? READ : WRITE,
err = compat_import_iovec(save_addr ? READ : WRITE,
compat_ptr(msg.msg_iov), msg.msg_iovlen,
UIO_FASTIOV, iov, &kmsg->msg_iter);
return err < 0 ? err : 0;
}
/* Bleech... */