[PATCH v4 3/6] uio: return status with iov truncation
From: Kanchan Joshi <hidden>
Date: 2020-07-24 16:23:30
Also in:
io-uring, linux-block, linux-fsdevel, lkml
Subsystem:
the rest, userspace copyin/copyout (uiovec) · Maintainers:
Linus Torvalds, Alexander Viro
From: SelvaKumar S <redacted> Make iov_iter_truncate to report whether it actually truncated. This helps callers which want to process the iov_iter in its entirety. Signed-off-by: SelvaKumar S <redacted> Signed-off-by: Kanchan Joshi <redacted> Signed-off-by: Nitesh Shetty <redacted> Signed-off-by: Javier Gonzalez <redacted> --- include/linux/uio.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 9576fd8..c681a60 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h@@ -241,7 +241,7 @@ static inline size_t iov_iter_count(const struct iov_iter *i) * greater than the amount of data in iov_iter is fine - it'll just do * nothing in that case. */ -static inline void iov_iter_truncate(struct iov_iter *i, u64 count) +static inline bool iov_iter_truncate(struct iov_iter *i, u64 count) { /* * count doesn't have to fit in size_t - comparison extends both
@@ -249,8 +249,11 @@ static inline void iov_iter_truncate(struct iov_iter *i, u64 count) * conversion in assignement is by definition greater than all * values of size_t, including old i->count. */ - if (i->count > count) + if (i->count > count) { i->count = count; + return true; + } + return false; } /*
--
2.7.4