This updates bio_map_kern() to check for pages in the vmalloc address
range and call the new kernel flushing APIs if the are. This should
allow any kernel user to pass a vmalloc/vmap area to block.
Signed-off-by: James Bottomley <James.Bottomley@xxxxxxx>
---
fs/bio.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/fs/bio.c b/fs/bio.c
index 7673800..ea346b4 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1120,6 +1120,13 @@ void bio_unmap_user(struct bio *bio)
static void bio_map_kern_endio(struct bio *bio, int err)
{
+ void *kaddr = bio->bi_private;
+ if (is_vmalloc_addr(kaddr)) {
+ void *addr;
+ for (addr = kaddr; addr < kaddr + bio->bi_size;
+ addr += PAGE_SIZE)
+ invalidate_kernel_dcache_addr(addr);
+ }
bio_put(bio);
}
@@ -1138,9 +1145,12 @@ static struct bio *__bio_map_kern(struct request_queue *q, void *data,
if (!bio)
return ERR_PTR(-ENOMEM);
+ bio->bi_private = data;
+
offset = offset_in_page(kaddr);
for (i = 0; i < nr_pages; i++) {
unsigned int bytes = PAGE_SIZE - offset;
+ struct page *page;
if (len <= 0)
break;
@@ -1148,8 +1158,13 @@ static struct bio *__bio_map_kern(struct request_queue *q, void *data,
if (bytes > len)
bytes = len;
- if (bio_add_pc_page(q, bio, virt_to_page(data), bytes,
- offset) < bytes)
+ if (is_vmalloc_addr(data)) {
+ flush_kernel_dcache_addr(data);
+ page = vmalloc_to_page(data);
+ } else
+ page = virt_to_page(data);
+
+ if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes)
break;
data += bytes;
--
1.6.3.3
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