This patchset follows the updates in the write_dev_flush function. The flush
bio can be preallocated at the device creation time, so we avoid repeated
alloc/free.
Next, there's a new sysfs tunable to enable forced dev flushes for devices that
do not support the barriers. This helps to test the new code but is not meant
for any non-debugging use.
I've tested lightly with some workloads and toggled the sysfs knob during that,
all fine.
David Sterba (5):
btrfs: preallocate device flush bio
btrfs: account as waiting for IO, while waiting fot the flush bio
completion
btrfs: move dev stats accounting out of wait_dev_flush
btrfs: add fs flag to force device flushing
btrfs: sysfs: export the force_dev_flush flag
fs/btrfs/ctree.h | 1 +
fs/btrfs/disk-io.c | 41 +++++++++++++----------------------------
fs/btrfs/sysfs.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.c | 12 ++++++++++++
fs/btrfs/volumes.h | 1 +
5 files changed, 74 insertions(+), 28 deletions(-)
--
2.13.0
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