linux-toradex.git/drivers/block/drbd/drbd_actlog.c, branch v3.5-rc3

drbd: introduce a bio_set to allocate housekeeping bios from

2012-05-09T13:17:07+00:00

Don't rely on availability of bios from the global fs_bio_set,
we should use our own bio_set for meta data IO.

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: missing wakeup after drbd_rs_del_all

2012-05-09T13:16:42+00:00

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: Consider the disk-timeout also for meta-data IO operations

2012-05-09T13:16:30+00:00

If the backing device is already frozen during attach, we failed
to recognize that. The current disk-timeout code works on top
of the drbd_request objects. During attach we do not allow IO
and therefore never generate a drbd_request object but block
before that in drbd_make_request().

This patch adds the timeout to all drbd_md_sync_page_io().

Before this patch we used to go from D_ATTACHING directly
to D_DISKLESS if IO failed during attach. We can no longer
do this since we have to stay in D_FAILED until all IO
ops issued to the backing device returned.

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: fix potential spinlock deadlock

2012-05-09T13:15:58+00:00

drbd_try_clear_on_disk_bm() has a sanity check for the number of blocks
left to be resynced (rs_left) in the current resync extent.
If it detects a mismatch, it complains, and forces a disconnect using
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));

Unfortunately, this may be called while holding the req_lock,
and drbd_force_state() want's to aquire that lock itself. Deadlock.

Don't force a disconnect, but fix up rs_left by recounting and
reassigning the number of dirty blocks in that extent.

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: Hold a reference to ldev while doing meta-data IO

2012-05-09T08:31:11+00:00

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: Keep a reference to the bio until the completion handler finished

2012-05-09T08:28:51+00:00

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: Implemented wait_until_done_or_disk_failure()

2012-05-09T08:26:51+00:00

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: Replaced md_io_mutex by an atomic: md_io_in_use

2012-05-09T08:22:31+00:00

The new function drbd_md_get_buffer() aborts waiting for the buffer
in case the disk failes in the meantime.

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: moved md_io into mdev

2012-05-09T08:17:24+00:00

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg

drbd: we should write meta data updates with FLUSH FUA

2011-06-30T07:23:46+00:00

We used to write these with BIO_RW_BARRIER aka REQ_HARDBARRIER (unless
disabled in the configuration). The correct semantic now would be to
write with FLUSH/FUA.
For example, with activity log transactions, FUA alone is not enough, we
need the corresponding bitmap update (and all related application
updates) on stable storage as well.

Signed-off-by: Philipp Reisner 
Signed-off-by: Lars Ellenberg