mirror of
https://github.com/ceph/ceph
synced 2024-12-30 07:23:11 +00:00
130 lines
3.5 KiB
Bash
Executable File
130 lines
3.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# This documents the state of things as of 4.12-rc4.
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#
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# - fallocate -z deallocates because BLKDEV_ZERO_NOUNMAP hint is ignored by
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# krbd
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#
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# - unaligned fallocate -z/-p appear to not deallocate -- see caveat #2 in
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# linux.git commit 6ac56951dc10 ("rbd: implement REQ_OP_WRITE_ZEROES")
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set -ex
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# no blkdiscard(8) in trusty
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function py_blkdiscard() {
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local offset=$1
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python <<EOF
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import fcntl, struct
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BLKDISCARD = 0x1277
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with open('$DEV', 'w') as dev:
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fcntl.ioctl(dev, BLKDISCARD, struct.pack('QQ', $offset, $IMAGE_SIZE - $offset))
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EOF
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}
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# fallocate(1) in trusty doesn't support -z/-p
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function py_fallocate() {
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local mode=$1
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local offset=$2
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python <<EOF
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import os, ctypes, ctypes.util
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FALLOC_FL_KEEP_SIZE = 0x01
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FALLOC_FL_PUNCH_HOLE = 0x02
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FALLOC_FL_ZERO_RANGE = 0x10
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libc = ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True)
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with open('$DEV', 'w') as dev:
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if libc.fallocate(dev.fileno(), ctypes.c_int($mode), ctypes.c_long($offset), ctypes.c_long($IMAGE_SIZE - $offset)):
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err = ctypes.get_errno()
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raise OSError(err, os.strerror(err))
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EOF
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}
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function allocate() {
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xfs_io -c "pwrite -b $OBJECT_SIZE -W 0 $IMAGE_SIZE" $DEV
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cmp <(od -xAx $DEV) - <<EOF
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000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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$(printf %x $IMAGE_SIZE)
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EOF
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[[ $(rados -p rbd ls | grep -c rbd_data.$IMAGE_ID) -eq $NUM_OBJECTS ]]
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}
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function assert_deallocated() {
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cmp <(od -xAx $DEV) - <<EOF
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000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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$(printf %x $IMAGE_SIZE)
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EOF
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[[ $(rados -p rbd ls | grep -c rbd_data.$IMAGE_ID) -eq 0 ]]
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}
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function assert_deallocated_unaligned() {
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local num_objects_expected=$1
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cmp <(od -xAx $DEV) - <<EOF
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000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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$(printf %x $((OBJECT_SIZE / 2))) 0000 0000 0000 0000 0000 0000 0000 0000
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*
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$(printf %x $IMAGE_SIZE)
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EOF
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[[ $(rados -p rbd ls | grep -c rbd_data.$IMAGE_ID) -eq $num_objects_expected ]]
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for ((i = 0; i < $num_objects_expected; i++)); do
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rados -p rbd stat rbd_data.$IMAGE_ID.$(printf %016x $i) | grep "size $((OBJECT_SIZE / 2))"
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done
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}
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IMAGE_NAME="fallocate-test"
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rbd create --size 200 $IMAGE_NAME
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IMAGE_SIZE=$(rbd info --format=json $IMAGE_NAME | python -c 'import sys, json; print json.load(sys.stdin)["size"]')
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OBJECT_SIZE=$(rbd info --format=json $IMAGE_NAME | python -c 'import sys, json; print json.load(sys.stdin)["object_size"]')
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NUM_OBJECTS=$((IMAGE_SIZE / OBJECT_SIZE))
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[[ $((IMAGE_SIZE % OBJECT_SIZE)) -eq 0 ]]
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IMAGE_ID="$(rbd info --format=json $IMAGE_NAME |
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python -c "import sys, json; print json.load(sys.stdin)['block_name_prefix'].split('.')[1]")"
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DEV=$(sudo rbd map $IMAGE_NAME)
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# make sure -ENOENT is hidden
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assert_deallocated
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py_blkdiscard 0
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assert_deallocated
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# blkdev_issue_discard
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allocate
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py_blkdiscard 0
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assert_deallocated
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# blkdev_issue_zeroout w/ BLKDEV_ZERO_NOUNMAP
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allocate
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py_fallocate FALLOC_FL_ZERO_RANGE\|FALLOC_FL_KEEP_SIZE 0
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assert_deallocated
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# blkdev_issue_zeroout w/ BLKDEV_ZERO_NOFALLBACK
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allocate
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py_fallocate FALLOC_FL_PUNCH_HOLE\|FALLOC_FL_KEEP_SIZE 0
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assert_deallocated
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# unaligned blkdev_issue_discard
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allocate
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py_blkdiscard $((OBJECT_SIZE / 2))
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assert_deallocated_unaligned 1
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# unaligned blkdev_issue_zeroout w/ BLKDEV_ZERO_NOUNMAP
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allocate
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py_fallocate FALLOC_FL_ZERO_RANGE\|FALLOC_FL_KEEP_SIZE $((OBJECT_SIZE / 2))
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assert_deallocated_unaligned $NUM_OBJECTS
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# unaligned blkdev_issue_zeroout w/ BLKDEV_ZERO_NOFALLBACK
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allocate
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py_fallocate FALLOC_FL_PUNCH_HOLE\|FALLOC_FL_KEEP_SIZE $((OBJECT_SIZE / 2))
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assert_deallocated_unaligned $NUM_OBJECTS
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sudo rbd unmap $DEV
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echo OK
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