linux/drivers/block/drbd, branch v3.17

Merge branch 'for-3.17/drivers' of git://git.kernel.dk/linux-block

2014-08-14T15:10:21Z

Pull block driver changes from Jens Axboe: "Nothing out of the ordinary here, this pull request contains: - A big round of fixes for bcache from Kent Overstreet, Slava Pestov, and Surbhi Palande. No new features, just a lot of fixes. - The usual round of drbd updates from Andreas Gruenbacher, Lars Ellenberg, and Philipp Reisner. - virtio_blk was converted to blk-mq back in 3.13, but now Ming Lei has taken it one step further and added support for actually using more than one queue. - Addition of an explicit SG_FLAG_Q_AT_HEAD for block/bsg, to compliment the the default behavior of adding to the tail of the queue. From Douglas Gilbert" * 'for-3.17/drivers' of git://git.kernel.dk/linux-block: (86 commits) bcache: Drop unneeded blk_sync_queue() calls bcache: add mutex lock for bch_is_open bcache: Correct printing of btree_gc_max_duration_ms bcache: try to set b->parent properly bcache: fix memory corruption in init error path bcache: fix crash with incomplete cache set bcache: Fix more early shutdown bugs bcache: fix use-after-free in btree_gc_coalesce() bcache: Fix an infinite loop in journal replay bcache: fix crash in bcache_btree_node_alloc_fail tracepoint bcache: bcache_write tracepoint was crashing bcache: fix typo in bch_bkey_equal_header bcache: Allocate bounce buffers with GFP_NOWAIT bcache: Make sure to pass GFP_WAIT to mempool_alloc() bcache: fix uninterruptible sleep in writeback thread bcache: wait for buckets when allocating new btree root bcache: fix crash on shutdown in passthrough mode bcache: fix lockdep warnings on shutdown bcache allocator: send discards with correct size bcache: Fix to remove the rcu_sched stalls. ...

drbd: silence underflow warning in read_in_block()

2014-07-10T16:35:23Z

My static checker warns that "data_size" could be negative and underflow the limit check. The code looks suspicious but I don't know if it is a real bug. Signed-off-by: Dan Carpenter Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: implicitly truncate cpu-mask

2014-07-10T16:35:22Z

Don't error out with misleading "out of memory" if the cpu-mask has more bits set than there are CPUs. Just truncate to nr_cpu_ids implicitly. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: drop spurious parameters from _drbd_md_sync_page_io

2014-07-10T16:35:22Z

size is always 4096, page is always device->md_io.page. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: resync should only lock out specific ranges

2014-07-10T16:35:21Z

During resync, if we need to block some specific incoming write because of active resync requests to that same range, we potentially caused *all* new application writes (to "cold" activity log extents) to block until this one request has been processed. Improve the do_submit() logic to * grab all incoming requests to some "incoming" list * process this list - move aside requests that are blocked by resync - prepare activity log transactions, - commit transactions and submit corresponding requests - if there are remaining requests that only wait for activity log extents to become free, stop the fast path (mark activity log as "starving") - iterate until no more requests are waiting for the activity log, but all potentially remaining requests are only blocked by resync * only then grab new incoming requests That way, very busy IO on currently "hot" activity log extents cannot starve scattered IO to "cold" extents. And blocked-by-resync requests are processed once resync traffic on the affected region has ceased, without blocking anything else. The only blocking mode left is when we cannot start requests to "cold" extents because all currently "hot" extents are actually used. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: debugfs: add per device data_gen_id

2014-07-10T16:35:21Z

The data generation identifiers used to be exposed via sysfs at /sys/block/drbdX/drbd/meta_data/data_gen_id (out-of-tree), for advanced policy scripting. Bring that information over to debugfs. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: debugfs: add per connection oldest requests

2014-07-10T16:35:20Z

Information of former /sys/block/drbdX/drbd/oldest_requests is already with higher detail in these files: debugfs/drbd/resource/$name/in_flight_summary, debugfs/drbd/resource/$name/volumes/$vnr/oldest_requests This patch adds debugfs/drbd/resource/$name/connections/peer/oldest_requests Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: debugfs: add version tag to debugfs files

2014-07-10T16:35:19Z

Make the first line of debugfs files a version number, starting now with "v: 0". If we change content of presentation, we will bump that. Monitoring or diagnostic scritps that may parse these files can then easily know when they need to be reviewed. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: debugfs: add per volume oldest_requests

2014-07-10T16:35:19Z

Show oldest requests * pending master bio completion and, * if different, local disk bio completion. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg

drbd: debugfs: add callback_history

2014-07-10T16:35:18Z

Add a per-connection worker thread callback_history with timing details, call site and callback function. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg