crimson/osd: add the delete-head special case of CEPH_OSD_OP_ROLLBACK

[rzarzynski]

This allows to pass TestLibRBD.TestIOToSnapshot:

[rzarzynski@o06 build]$ CRIMSON_COMPAT=true RBD_FEATURES=1 bin/ceph_test_librbd --gtest_filter=TestLibRBD.TestIOToSnapshot
seed 3954016
Note: Google Test filter = TestLibRBD.TestIOToSnapshot
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from TestLibRBD
[ RUN      ] TestLibRBD.TestIOToSnapshot
using new format!
...
opening testimg@orig
read: 80
write to snapshot returned -30
Read-only file system
num snaps is: 2
expected: 2
snap: orig
snap: written
found orig with size 2097152
found written with size 2097152
num snaps is: 1
expected: 1
snap: orig
found orig with size 2097152
num snaps is: 0
expected: 0
[       OK ] TestLibRBD.TestIOToSnapshot (7510 ms)
[----------] 1 test from TestLibRBD (7510 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (8504 ms total)
[  PASSED  ] 1 test.

Signed-off-by: Radoslaw Zarzynski [email protected]

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[athanatos]

/home/jenkins-build/build/workspace/ceph-pull-requests/src/crimson/osd/pg_backend.cc:722:30: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture] ).safe_then_interruptible([this](auto ref) {

[Matan-B]

/home/jenkins-build/build/workspace/ceph-pull-requests/src/crimson/osd/pg_backend.cc:802:30: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]

[rzarzynski]

Introduced the rollback_ertr and fixed lambda capture. Thanks for pointing it out!

[rzarzynski]

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