[SCSI] libosd: osd_req_{read,write} takes a length parameter

For supporting of chained-bios we can not inspect the first
bio only, as before. Caller shall pass the total length of the
request, ie. sum_bytes(bio-chain).

Also since the bio might be a chain we don't set it's direction
on behalf of it's callers. The bio direction should be properly
set prior to this call. So fix a couple of write users that now
need to set the bio direction properly

[In this patch I change both library code and user sites at
 exofs, to make it easy on integration. It should be submitted
 via James's scsi-misc tree.]

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
CC: Jeff Garzik <jeff@garzik.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

3 files changed, 18 insertions, 14 deletions

diff --git a/drivers/scsi/osd/osd_initiator.c b/drivers/scsi/osd/osd_initiator.c
index ba2ebae305cd..3f5ec578e6c6 100644
--- a/drivers/scsi/osd/osd_initiator.c
+++ b/drivers/scsi/osd/osd_initiator.c
@@ -779,13 +779,14 @@ EXPORT_SYMBOL(osd_req_remove_object);
 */
 
 void osd_req_write(struct osd_request *or,
-        const struct osd_obj_id *obj, struct bio *bio, u64 offset)
+        const struct osd_obj_id *obj, u64 offset,
+        struct bio *bio, u64 len)
 {
-        _osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, bio->bi_size);
+        _osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, len);
         WARN_ON(or->out.bio || or->out.total_bytes);
-        bio->bi_rw |= (1 << BIO_RW);
+        WARN_ON(0 ==  bio_rw_flagged(bio, BIO_RW));
         or->out.bio = bio;
-        or->out.total_bytes = bio->bi_size;
+        or->out.total_bytes = len;
 }
 EXPORT_SYMBOL(osd_req_write);
 
@@ -798,7 +799,8 @@ int osd_req_write_kern(struct osd_request *or,
         if (IS_ERR(bio))
                 return PTR_ERR(bio);
 
-        osd_req_write(or, obj, bio, offset);
+        bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
+        osd_req_write(or, obj, offset, bio, len);
         return 0;
 }
 EXPORT_SYMBOL(osd_req_write_kern);
@@ -828,13 +830,14 @@ void osd_req_flush_object(struct osd_request *or,
 EXPORT_SYMBOL(osd_req_flush_object);
 
 void osd_req_read(struct osd_request *or,
-        const struct osd_obj_id *obj, struct bio *bio, u64 offset)
+        const struct osd_obj_id *obj, u64 offset,
+        struct bio *bio, u64 len)
 {
-        _osd_req_encode_common(or, OSD_ACT_READ, obj, offset, bio->bi_size);
+        _osd_req_encode_common(or, OSD_ACT_READ, obj, offset, len);
         WARN_ON(or->in.bio || or->in.total_bytes);
-        bio->bi_rw &= ~(1 << BIO_RW);
+        WARN_ON(1 == bio_rw_flagged(bio, BIO_RW));
         or->in.bio = bio;
-        or->in.total_bytes = bio->bi_size;
+        or->in.total_bytes = len;
 }
 EXPORT_SYMBOL(osd_req_read);
 
@@ -847,7 +850,7 @@ int osd_req_read_kern(struct osd_request *or,
         if (IS_ERR(bio))
                 return PTR_ERR(bio);
 
-        osd_req_read(or, obj, bio, offset);
+        osd_req_read(or, obj, offset, bio, len);
         return 0;
 }
 EXPORT_SYMBOL(osd_req_read_kern);
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index ba8d9fab4693..f79e8e58c3a2 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -266,7 +266,7 @@ static int read_exec(struct page_collect *pcol, bool is_sync)
                 goto err;
         }
 
-        osd_req_read(or, &obj, pcol->bio, i_start);
+        osd_req_read(or, &obj, i_start, pcol->bio, pcol->length);
 
         if (is_sync) {
                 exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred);
@@ -522,7 +522,8 @@ static int write_exec(struct page_collect *pcol)
 
         *pcol_copy = *pcol;
 
-        osd_req_write(or, &obj, pcol_copy->bio, i_start);
+        pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
+        osd_req_write(or, &obj, i_start, pcol_copy->bio, pcol_copy->length);
         ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred);
         if (unlikely(ret)) {
                 EXOFS_ERR("write_exec: exofs_async_op() Faild\n");
diff --git a/include/scsi/osd_initiator.h b/include/scsi/osd_initiator.h
index 6132790d678f..8c1e3b804afd 100644
--- a/include/scsi/osd_initiator.h
+++ b/include/scsi/osd_initiator.h
@@ -363,7 +363,7 @@ void osd_req_create_object(struct osd_request *or, struct osd_obj_id *);
 void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *);
 
 void osd_req_write(struct osd_request *or,
-        const struct osd_obj_id *, struct bio *data_out, u64 offset);
+        const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
 int osd_req_write_kern(struct osd_request *or,
         const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
 void osd_req_append(struct osd_request *or,
@@ -380,7 +380,7 @@ void osd_req_flush_object(struct osd_request *or,
         /*V2*/ u64 offset, /*V2*/ u64 len);
 
 void osd_req_read(struct osd_request *or,
-        const struct osd_obj_id *, struct bio *data_in, u64 offset);
+        const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
 int osd_req_read_kern(struct osd_request *or,
         const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);