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-rw-r--r--fs/bio.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/bio.c b/fs/bio.c
index 356e742..13be075 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -788,6 +788,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
int i, ret;
int nr_pages = 0;
unsigned int len = 0;
+ unsigned int offset = map_data ? map_data->offset & ~PAGE_MASK : 0;
for (i = 0; i < iov_count; i++) {
unsigned long uaddr;
@@ -814,12 +815,16 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
bio->bi_rw |= (!write_to_vm << BIO_RW);
ret = 0;
- i = 0;
- if (map_data)
+
+ if (map_data) {
nr_pages = 1 << map_data->page_order;
+ i = map_data->offset / PAGE_SIZE;
+ }
while (len) {
unsigned int bytes = PAGE_SIZE;
+ bytes -= offset;
+
if (bytes > len)
bytes = len;
@@ -841,10 +846,11 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
}
}
- if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes)
+ if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes)
break;
len -= bytes;
+ offset = 0;
}
if (ret)
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