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authorAl Viro <viro@zeniv.linux.org.uk>2014-04-04 23:12:29 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-05-06 17:39:45 -0400
commit62a8067a7f35dba2de501c9cb00e4cf36da90bc0 (patch)
treebb008456891c13b9d8a25825a10074efb861cd88 /include/linux/uio.h
parent81055e584f9d743cb13dc7944923d817c20f089d (diff)
downloadlinux-stericsson-62a8067a7f35dba2de501c9cb00e4cf36da90bc0.tar.gz
bio_vec-backed iov_iter
New variant of iov_iter - ITER_BVEC in iter->type, backed with bio_vec array instead of iovec one. Primitives taught to deal with such beasts, __swap_write() switched to using that kind of iov_iter. Note that bio_vec is just a <page, offset, length> triple - there's nothing block-specific about it. I've left the definition where it was, but took it from under ifdef CONFIG_BLOCK. Next target: ->splice_write()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/uio.h')
-rw-r--r--include/linux/uio.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h
index e8a109a75de1..e2231e47cec1 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -19,12 +19,21 @@ struct kvec {
size_t iov_len;
};
+enum {
+ ITER_IOVEC = 0,
+ ITER_KVEC = 2,
+ ITER_BVEC = 4,
+};
+
struct iov_iter {
int type;
- const struct iovec *iov;
- unsigned long nr_segs;
size_t iov_offset;
size_t count;
+ union {
+ const struct iovec *iov;
+ const struct bio_vec *bvec;
+ };
+ unsigned long nr_segs;
};
/*
@@ -54,6 +63,7 @@ static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
}
#define iov_for_each(iov, iter, start) \
+ if (!((start).type & ITER_BVEC)) \
for (iter = (start); \
(iter).count && \
((iov = iov_iter_iovec(&(iter))), 1); \