At 02/18/2017 09:28 AM, Liu Bo wrote:
This is attempting to make __btrfs_map_block less scary :)
Great!!
That's also what I want to do in btrfs-progs.
And it would be better if we can take a step further to have a better
API for both pure mirrored/striped profile and parity profile.
I tried to do it in btrfs-progs with the following patchset, while it
needs more work to do in kernel.
https://patchwork.kernel.org/patch/9488519/
The major changes are
1) split operations for discard out of __btrfs_map_block and we don't copy
discard operations for the target device of dev replace since they're not
as important as writes.
2) put dev replace stuff into helpers since they're basically
self-independant.
Quite good starting point.
Thanks,
Qu
Liu Bo (7):
Btrfs: create a helper for getting chunk map
Btrfs: separate DISCARD from __btrfs_map_block
Btrfs: introduce a function to get extra mirror from replace
Btrfs: handle operations for device replace separately
Btrfs: do not add extra mirror when dev_replace target dev is not
available
Btrfs: helper for ops that requires full stripe
Btrfs: convert BUG_ON to WARN_ON
fs/btrfs/extent_io.c | 3 +-
fs/btrfs/volumes.c | 824 +++++++++++++++++++++++++++------------------------
fs/btrfs/volumes.h | 2 +-
3 files changed, 445 insertions(+), 384 deletions(-)
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