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| author | Philipp Reisner <philipp.reisner@linbit.com> | 2016-06-14 00:26:13 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-13 21:43:04 -0600 |
| commit | 700ca8c04a0f4402f379055eec97351e0d6c0087 (patch) | |
| tree | c69ed1d2afe9c805a018e04baec8694043b9882b /drivers/block/drbd/drbd_worker.c | |
| parent | c5c2385481971a587b4f036d640cc585d75601a0 (diff) | |
| download | linux-700ca8c04a0f4402f379055eec97351e0d6c0087.tar.gz linux-700ca8c04a0f4402f379055eec97351e0d6c0087.tar.xz | |
drbd: Implement handling of thinly provisioned storage on resync target nodes
If during resync we read only zeroes for a range of sectors assume
that these secotors can be discarded on the sync target node.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/drbd/drbd_worker.c')
| -rw-r--r-- | drivers/block/drbd/drbd_worker.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 51fab978eb61..dd85433315d2 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -1036,6 +1036,30 @@ int w_e_end_data_req(struct drbd_work *w, int cancel) return err; } +static bool all_zero(struct drbd_peer_request *peer_req) +{ + struct page *page = peer_req->pages; + unsigned int len = peer_req->i.size; + + page_chain_for_each(page) { + unsigned int l = min_t(unsigned int, len, PAGE_SIZE); + unsigned int i, words = l / sizeof(long); + unsigned long *d; + + d = kmap_atomic(page); + for (i = 0; i < words; i++) { + if (d[i]) { + kunmap_atomic(d); + return false; + } + } + kunmap_atomic(d); + len -= l; + } + + return true; +} + /** * w_e_end_rsdata_req() - Worker callback to send a P_RS_DATA_REPLY packet in response to a P_RS_DATA_REQUEST * @w: work object. @@ -1064,7 +1088,10 @@ int w_e_end_rsdata_req(struct drbd_work *w, int cancel) } else if (likely((peer_req->flags & EE_WAS_ERROR) == 0)) { if (likely(device->state.pdsk >= D_INCONSISTENT)) { inc_rs_pending(device); - err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); + if (peer_req->flags & EE_RS_THIN_REQ && all_zero(peer_req)) + err = drbd_send_rs_deallocated(peer_device, peer_req); + else + err = drbd_send_block(peer_device, P_RS_DATA_REPLY, peer_req); } else { if (__ratelimit(&drbd_ratelimit_state)) drbd_err(device, "Not sending RSDataReply, " |