/* * snapshot.c Ceph snapshot context utility routines (part of libceph) * * Copyright (C) 2013 Inktank Storage, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #include #include #include #include /* * Ceph snapshot contexts are reference counted objects, and the * returned structure holds a single reference. Acquire additional * references with ceph_get_snap_context(), and release them with * ceph_put_snap_context(). When the reference count reaches zero * the entire structure is freed. */ /* * Create a new ceph snapshot context large enough to hold the * indicated number of snapshot ids (which can be 0). Caller has * to fill in snapc->seq and snapc->snaps[0..snap_count-1]. * * Returns a null pointer if an error occurs. */ struct ceph_snap_context *ceph_create_snap_context(u32 snap_count, gfp_t gfp_flags) { struct ceph_snap_context *snapc; size_t size; size = sizeof (struct ceph_snap_context); size += snap_count * sizeof (snapc->snaps[0]); snapc = kzalloc(size, gfp_flags); if (!snapc) return NULL; atomic_set(&snapc->nref, 1); snapc->num_snaps = snap_count; return snapc; } EXPORT_SYMBOL(ceph_create_snap_context); struct ceph_snap_context *ceph_get_snap_context(struct ceph_snap_context *sc) { if (sc) atomic_inc(&sc->nref); return sc; } EXPORT_SYMBOL(ceph_get_snap_context); void ceph_put_snap_context(struct ceph_snap_context *sc) { if (!sc) return; if (atomic_dec_and_test(&sc->nref)) { /*printk(" deleting snap_context %p\n", sc);*/ kfree(sc); } } EXPORT_SYMBOL(ceph_put_snap_context); 1c874a9c00980552fe508c'>diff
path: root/include/dt-bindings/clock/qcom,gcc-ipq806x.h
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /include/dt-bindings/clock/qcom,gcc-ipq806x.h
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/dt-bindings/clock/qcom,gcc-ipq806x.h')