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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-13 20:36:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-13 20:36:53 +0300
commita2d79c7174aeb43b13020dd53d85a7aefdd9f3e5 (patch)
tree6873d0b44b98eb8038207f0d3fa849264f0fe642 /lib
parent964a4eacef67503a1154f7e0a75f52fbdce52022 (diff)
parenta4c0b3decb33fb4a2b5ecc6234a50680f0b21e7d (diff)
downloadlinux-a2d79c7174aeb43b13020dd53d85a7aefdd9f3e5.tar.xz
Merge tag 'for-5.3/io_uring-20190711' of git://git.kernel.dk/linux-block
Pull io_uring updates from Jens Axboe: "This contains: - Support for recvmsg/sendmsg as first class opcodes. I don't envision going much further down this path, as there are plans in progress to support potentially any system call in an async fashion through io_uring. But I think it does make sense to have certain core ops available directly, especially those that can support a "try this non-blocking" flag/mode. (me) - Handle generic short reads automatically. This can happen fairly easily if parts of the buffered read is cached. Since the application needs to issue another request for the remainder, just do this internally and save kernel/user roundtrip while providing a nicer more robust API. (me) - Support for linked SQEs. This allows SQEs to depend on each other, enabling an application to eg queue a read-from-this-file,write-to-that-file pair. (me) - Fix race in stopping SQ thread (Jackie)" * tag 'for-5.3/io_uring-20190711' of git://git.kernel.dk/linux-block: io_uring: fix io_sq_thread_stop running in front of io_sq_thread io_uring: add support for recvmsg() io_uring: add support for sendmsg() io_uring: add support for sqe links io_uring: punt short reads to async context uio: make import_iovec()/compat_import_iovec() return bytes on success
Diffstat (limited to 'lib')
-rw-r--r--lib/iov_iter.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f99c41d4eb54..f1e0569b4539 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1634,9 +1634,9 @@ EXPORT_SYMBOL(dup_iter);
* on-stack array was used or not (and regardless of whether this function
* returns an error or not).
*
- * Return: 0 on success or negative error code on error.
+ * Return: Negative error code on error, bytes imported on success
*/
-int import_iovec(int type, const struct iovec __user * uvector,
+ssize_t import_iovec(int type, const struct iovec __user * uvector,
unsigned nr_segs, unsigned fast_segs,
struct iovec **iov, struct iov_iter *i)
{
@@ -1652,16 +1652,17 @@ int import_iovec(int type, const struct iovec __user * uvector,
}
iov_iter_init(i, type, p, nr_segs, n);
*iov = p == *iov ? NULL : p;
- return 0;
+ return n;
}
EXPORT_SYMBOL(import_iovec);
#ifdef CONFIG_COMPAT
#include <linux/compat.h>
-int compat_import_iovec(int type, const struct compat_iovec __user * uvector,
- unsigned nr_segs, unsigned fast_segs,
- struct iovec **iov, struct iov_iter *i)
+ssize_t compat_import_iovec(int type,
+ const struct compat_iovec __user * uvector,
+ unsigned nr_segs, unsigned fast_segs,
+ struct iovec **iov, struct iov_iter *i)
{
ssize_t n;
struct iovec *p;
@@ -1675,7 +1676,7 @@ int compat_import_iovec(int type, const struct compat_iovec __user * uvector,
}
iov_iter_init(i, type, p, nr_segs, n);
*iov = p == *iov ? NULL : p;
- return 0;
+ return n;
}
#endif