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authorAl Viro <viro@zeniv.linux.org.uk>2016-04-08 19:05:19 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-04-08 19:46:28 -0400
commit357f435d8a0d32068c75f3c7176434d992b3adb7 (patch)
tree036a03d154f9910fe94a7b27b5144d04fea6ddc3 /lib/iov_iter.c
parent03cc0789a690eb9ab07070376252961caeae7441 (diff)
downloadlwn-357f435d8a0d32068c75f3c7176434d992b3adb7.tar.gz
lwn-357f435d8a0d32068c75f3c7176434d992b3adb7.zip
fix the copy vs. map logics in blk_rq_map_user_iov()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'lib/iov_iter.c')
-rw-r--r--lib/iov_iter.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 5fecddc32b1b..ca5316e0087b 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -569,6 +569,25 @@ unsigned long iov_iter_alignment(const struct iov_iter *i)
}
EXPORT_SYMBOL(iov_iter_alignment);
+unsigned long iov_iter_gap_alignment(const struct iov_iter *i)
+{
+ unsigned long res = 0;
+ size_t size = i->count;
+ if (!size)
+ return 0;
+
+ iterate_all_kinds(i, size, v,
+ (res |= (!res ? 0 : (unsigned long)v.iov_base) |
+ (size != v.iov_len ? size : 0), 0),
+ (res |= (!res ? 0 : (unsigned long)v.bv_offset) |
+ (size != v.bv_len ? size : 0)),
+ (res |= (!res ? 0 : (unsigned long)v.iov_base) |
+ (size != v.iov_len ? size : 0))
+ );
+ return res;
+}
+EXPORT_SYMBOL(iov_iter_gap_alignment);
+
ssize_t iov_iter_get_pages(struct iov_iter *i,
struct page **pages, size_t maxsize, unsigned maxpages,
size_t *start)