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authorPhilipp Reisner <philipp.reisner@linbit.com>2011-01-17 22:27:30 +0300
committerPhilipp Reisner <philipp.reisner@linbit.com>2011-03-10 13:45:42 +0300
commit6a35c45f890dc18c5527ac501b308058118f20e7 (patch)
tree627c73d972af6905f2ab77131e4232c62d31a553 /drivers/block/drbd
parent2deb8336d04106f215c21ad1b029e78d12033d02 (diff)
downloadlinux-6a35c45f890dc18c5527ac501b308058118f20e7.tar.xz
drbd: Ensure that an epoch contains only requests of one kind
The assert in drbd_req.c:755 forces us to have only requests of one kind in an epoch. The two kinds we distinguish here are: local-only or mirrored. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd')
-rw-r--r--drivers/block/drbd/drbd_main.c7
-rw-r--r--drivers/block/drbd/drbd_req.c29
-rw-r--r--drivers/block/drbd/drbd_req.h18
3 files changed, 28 insertions, 26 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 1061b9fff2b0..34ee8e44a751 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1261,9 +1261,14 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
drbd_resume_al(mdev);
- if (os.conn == C_AHEAD && ns.conn != C_AHEAD)
+ /* Start a new epoch in case we start to mirror write requests */
+ if (!drbd_should_do_remote(os) && drbd_should_do_remote(ns))
tl_forget(mdev);
+ /* Do not add local-only requests to an epoch with mirrored requests */
+ if (drbd_should_do_remote(os) && !drbd_should_do_remote(ns))
+ set_bit(CREATE_BARRIER, &mdev->flags);
+
ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
if (ascw) {
ascw->os = os;
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 6f9d1bfcca58..336937a14d3f 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -762,27 +762,6 @@ static int drbd_may_do_local_read(struct drbd_conf *mdev, sector_t sector, int s
return 0 == drbd_bm_count_bits(mdev, sbnr, ebnr);
}
-static bool drbd_should_do_remote(struct drbd_conf *mdev)
-{
- union drbd_state s = mdev->state;
-
- return s.pdsk == D_UP_TO_DATE ||
- (s.pdsk >= D_INCONSISTENT &&
- s.conn >= C_WF_BITMAP_T &&
- s.conn < C_AHEAD);
- /* Before proto 96 that was >= CONNECTED instead of >= C_WF_BITMAP_T.
- That is equivalent since before 96 IO was frozen in the C_WF_BITMAP*
- states. */
-}
-static bool drbd_should_send_oos(struct drbd_conf *mdev)
-{
- union drbd_state s = mdev->state;
-
- return s.conn == C_AHEAD || s.conn == C_WF_BITMAP_S;
- /* pdsk = D_INCONSISTENT as a consequence. Protocol 96 check not necessary
- since we enter state C_AHEAD only if proto >= 96 */
-}
-
static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio, unsigned long start_time)
{
const int rw = bio_rw(bio);
@@ -854,8 +833,8 @@ static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio, uns
drbd_al_begin_io(mdev, sector);
}
- remote = remote && drbd_should_do_remote(mdev);
- send_oos = rw == WRITE && drbd_should_send_oos(mdev);
+ remote = remote && drbd_should_do_remote(mdev->state);
+ send_oos = rw == WRITE && drbd_should_send_oos(mdev->state);
D_ASSERT(!(remote && send_oos));
if (!(local || remote) && !is_susp(mdev->state)) {
@@ -896,8 +875,8 @@ allocate_barrier:
}
if (remote || send_oos) {
- remote = drbd_should_do_remote(mdev);
- send_oos = rw == WRITE && drbd_should_send_oos(mdev);
+ remote = drbd_should_do_remote(mdev->state);
+ send_oos = rw == WRITE && drbd_should_send_oos(mdev->state);
D_ASSERT(!(remote && send_oos));
if (!(remote || send_oos))
diff --git a/drivers/block/drbd/drbd_req.h b/drivers/block/drbd/drbd_req.h
index 077c47b1e9d7..32c1f2a31266 100644
--- a/drivers/block/drbd/drbd_req.h
+++ b/drivers/block/drbd/drbd_req.h
@@ -360,4 +360,22 @@ static inline int req_mod(struct drbd_request *req,
return rv;
}
+
+static inline bool drbd_should_do_remote(union drbd_state s)
+{
+ return s.pdsk == D_UP_TO_DATE ||
+ (s.pdsk >= D_INCONSISTENT &&
+ s.conn >= C_WF_BITMAP_T &&
+ s.conn < C_AHEAD);
+ /* Before proto 96 that was >= CONNECTED instead of >= C_WF_BITMAP_T.
+ That is equivalent since before 96 IO was frozen in the C_WF_BITMAP*
+ states. */
+}
+static inline bool drbd_should_send_oos(union drbd_state s)
+{
+ return s.conn == C_AHEAD || s.conn == C_WF_BITMAP_S;
+ /* pdsk = D_INCONSISTENT as a consequence. Protocol 96 check not necessary
+ since we enter state C_AHEAD only if proto >= 96 */
+}
+
#endif