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diff --git a/src/ceph/qa/workunits/rados/test_alloc_hint.sh b/src/ceph/qa/workunits/rados/test_alloc_hint.sh
new file mode 100755
index 0000000..3e24694
--- /dev/null
+++ b/src/ceph/qa/workunits/rados/test_alloc_hint.sh
@@ -0,0 +1,176 @@
+#!/bin/bash
+
+set -ex
+shopt -s nullglob # fns glob expansion in expect_alloc_hint_eq()
+
+#
+# Helpers
+#
+
+function get_xml_val() {
+    local xml="$1"
+    local tag="$2"
+
+    local regex=".*<${tag}>(.*)</${tag}>.*"
+    if [[ ! "${xml}" =~ ${regex} ]]; then
+        echo "'${xml}' xml doesn't match '${tag}' tag regex" >&2
+        return 2
+    fi
+
+    echo "${BASH_REMATCH[1]}"
+}
+
+function get_conf_val() {
+    set -e
+
+    local entity="$1"
+    local option="$2"
+
+    local val
+    val="$(sudo ceph daemon "${entity}" config get --format=xml "${option}")"
+    val="$(get_xml_val "${val}" "${option}")"
+
+    echo "${val}"
+}
+
+function setup_osd_data() {
+    for (( i = 0 ; i < "${NUM_OSDS}" ; i++ )); do
+        OSD_DATA[i]="$(get_conf_val "osd.$i" "osd_data")"
+    done
+}
+
+function setup_pgid() {
+    local poolname="$1"
+    local objname="$2"
+
+    local pgid
+    pgid="$(ceph osd map "${poolname}" "${objname}" --format=xml)"
+    pgid="$(get_xml_val "${pgid}" "pgid")"
+
+    PGID="${pgid}"
+}
+
+function expect_alloc_hint_eq() {
+    local expected_extsize="$1"
+
+    for (( i = 0 ; i < "${NUM_OSDS}" ; i++ )); do
+        # Make sure that stuff is flushed from the journal to the store
+        # by the time we get to it, as we prod the actual files and not
+        # the journal.
+        sudo ceph daemon "osd.${i}" "flush_journal"
+
+        # e.g., .../25.6_head/foo__head_7FC1F406__19
+        #       .../26.bs1_head/bar__head_EFE6384B__1a_ffffffffffffffff_1
+        local fns=$(sudo sh -c "ls ${OSD_DATA[i]}/current/${PGID}*_head/${OBJ}_*")
+        local count="${#fns[@]}"
+        if [ "${count}" -ne 1 ]; then
+            echo "bad fns count: ${count}" >&2
+            return 2
+        fi
+
+        local extsize
+        extsize="$(sudo xfs_io -c extsize "${fns[0]}")"
+        local extsize_regex="^\[(.*)\] ${fns[0]}$"
+        if [[ ! "${extsize}" =~ ${extsize_regex} ]]; then
+            echo "extsize doesn't match extsize_regex: ${extsize}" >&2
+            return 2
+        fi
+        extsize="${BASH_REMATCH[1]}"
+
+        if [ "${extsize}" -ne "${expected_extsize}" ]; then
+            echo "FAIL: alloc_hint: actual ${extsize}, expected ${expected_extsize}" >&2
+            return 1
+        fi
+    done
+}
+
+#
+# Global setup
+#
+
+EC_K="2"
+EC_M="1"
+NUM_OSDS="$((EC_K + EC_M))"
+
+NUM_PG="12"
+NUM_PGP="${NUM_PG}"
+
+LOW_CAP="$(get_conf_val "osd.0" "filestore_max_alloc_hint_size")"
+HIGH_CAP="$((LOW_CAP * 10))" # 10M, assuming 1M default cap
+SMALL_HINT="$((LOW_CAP / 4))" # 256K, assuming 1M default cap
+BIG_HINT="$((LOW_CAP * 6))" # 6M, assuming 1M default cap
+
+setup_osd_data
+
+#
+# ReplicatedBackend tests
+#
+
+POOL="alloc_hint-rep"
+ceph osd pool create "${POOL}" "${NUM_PG}"
+ceph osd pool set "${POOL}" size "${NUM_OSDS}"
+ceph osd pool application enable "${POOL}" rados
+
+OBJ="foo"
+setup_pgid "${POOL}" "${OBJ}"
+rados -p "${POOL}" create "${OBJ}"
+
+# Empty object, SMALL_HINT - expect SMALL_HINT
+rados -p "${POOL}" set-alloc-hint "${OBJ}" "${SMALL_HINT}" "${SMALL_HINT}"
+expect_alloc_hint_eq "${SMALL_HINT}"
+
+# Try changing to BIG_HINT (1) - expect LOW_CAP (BIG_HINT > LOW_CAP)
+rados -p "${POOL}" set-alloc-hint "${OBJ}" "${BIG_HINT}" "${BIG_HINT}"
+expect_alloc_hint_eq "${LOW_CAP}"
+
+# Bump the cap to HIGH_CAP
+ceph tell 'osd.*' injectargs "--filestore_max_alloc_hint_size ${HIGH_CAP}"
+
+# Try changing to BIG_HINT (2) - expect BIG_HINT (BIG_HINT < HIGH_CAP)
+rados -p "${POOL}" set-alloc-hint "${OBJ}" "${BIG_HINT}" "${BIG_HINT}"
+expect_alloc_hint_eq "${BIG_HINT}"
+
+ceph tell 'osd.*' injectargs "--filestore_max_alloc_hint_size ${LOW_CAP}"
+
+# Populate object with some data
+rados -p "${POOL}" put "${OBJ}" /etc/passwd
+
+# Try changing back to SMALL_HINT - expect BIG_HINT (non-empty object)
+rados -p "${POOL}" set-alloc-hint "${OBJ}" "${SMALL_HINT}" "${SMALL_HINT}"
+expect_alloc_hint_eq "${BIG_HINT}"
+
+OBJ="bar"
+setup_pgid "${POOL}" "${OBJ}"
+
+# Non-existent object, SMALL_HINT - expect SMALL_HINT (object creation)
+rados -p "${POOL}" set-alloc-hint "${OBJ}" "${SMALL_HINT}" "${SMALL_HINT}"
+expect_alloc_hint_eq "${SMALL_HINT}"
+
+ceph osd pool delete "${POOL}" "${POOL}" --yes-i-really-really-mean-it
+
+#
+# ECBackend tests
+#
+
+PROFILE="alloc_hint-ecprofile"
+POOL="alloc_hint-ec"
+ceph osd erasure-code-profile set "${PROFILE}" k=2 m=1 crush-failure-domain=osd
+ceph osd erasure-code-profile get "${PROFILE}" # just so it's logged
+ceph osd pool create "${POOL}" "${NUM_PG}" "${NUM_PGP}" erasure "${PROFILE}"
+ceph osd pool application enable "${POOL}" rados
+
+OBJ="baz"
+setup_pgid "${POOL}" "${OBJ}"
+rados -p "${POOL}" create "${OBJ}"
+
+# Empty object, SMALL_HINT - expect scaled-down SMALL_HINT
+rados -p "${POOL}" set-alloc-hint "${OBJ}" "${SMALL_HINT}" "${SMALL_HINT}"
+expect_alloc_hint_eq "$((SMALL_HINT / EC_K))"
+
+ceph osd pool delete "${POOL}" "${POOL}" --yes-i-really-really-mean-it
+
+#
+# Global teardown
+#
+
+echo "OK"