uio: make import_iovec()/compat_import_iovec() return bytes on success
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 <axboe@kernel.dk>
diff --git a/fs/splice.c b/fs/splice.c
index 14cb602..9841272 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1356,7 +1356,7 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
struct iov_iter iter;
- long error;
+ ssize_t error;
struct fd f;
int type;
@@ -1367,7 +1367,7 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, uiov,
error = import_iovec(type, uiov, nr_segs,
ARRAY_SIZE(iovstack), &iov, &iter);
- if (!error) {
+ if (error >= 0) {
error = do_vmsplice(f.file, &iter, flags);
kfree(iov);
}
@@ -1382,7 +1382,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
struct iov_iter iter;
- long error;
+ ssize_t error;
struct fd f;
int type;
@@ -1393,7 +1393,7 @@ COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, io
error = compat_import_iovec(type, iov32, nr_segs,
ARRAY_SIZE(iovstack), &iov, &iter);
- if (!error) {
+ if (error >= 0) {
error = do_vmsplice(f.file, &iter, flags);
kfree(iov);
}