linux/drivers/md/raid5-cache.c, branch v4.4

raid5-cache: start raid5 readonly if journal is missing

2015-11-01T02:48:29Z

If raid array is expected to have journal (eg, journal is set in MD superblock feature map) and the array is started without journal disk, start the array readonly. Signed-off-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: IO error handling

2015-11-01T02:48:29Z

There are 3 places the raid5-cache dispatches IO. The discard IO error doesn't matter, so we ignore it. The superblock write IO error can be handled in MD core. The remaining are log write and flush. When the IO error happens, we mark log disk faulty and fail all write IO. Read IO is still allowed to run. Userspace will get a notification too and corresponding daemon can choose setting raid array readonly for example. Signed-off-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: add trim support for log

2015-11-01T02:48:29Z

Since superblock is updated infrequently, we do a simple trim of log disk (a synchronous trim) Signed-off-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: use bio chaining

2015-11-01T02:48:28Z

Simplify the bio completion handler by using bio chaining and submitting bios as soon as they are full. Signed-off-by: Christoph Hellwig Reviewed-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: small log->seq cleanup

2015-11-01T02:48:28Z

Signed-off-by: Christoph Hellwig Reviewed-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: new helper: r5_reserve_log_entry

2015-11-01T02:48:28Z

Factor out code to reserve log space. Signed-off-by: Christoph Hellwig Reviewed-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: inline r5l_alloc_io_unit into r5l_new_meta

2015-11-01T02:48:28Z

This is the only user, and keeping all code initializing the io_unit structure together improves readbility. Signed-off-by: Christoph Hellwig Reviewed-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: take rdev->data_offset into account early on

2015-11-01T02:48:28Z

Set up bi_sector properly when we allocate an bio instead of updating it at submission time. Signed-off-by: Christoph Hellwig Signed-off-by: NeilBrown

raid5-cache: refactor bio allocation

2015-11-01T02:48:28Z

Split out a helper to allocate a bio for log writes. Signed-off-by: Christoph Hellwig Reviewed-by: Shaohua Li Signed-off-by: NeilBrown

raid5-cache: clean up r5l_get_meta

2015-11-01T02:48:28Z

Remove the only partially used local 'io' variable to simplify the code flow. Signed-off-by: Christoph Hellwig Reviewed-by: Shaohua Li Signed-off-by: NeilBrown