projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d7e09d03 PT |
1 | /* |
| 2 | * GPL HEADER START | |
| 3 | * | |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 only, | |
| 8 | * as published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, but | |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | * General Public License version 2 for more details (a copy is included | |
| 14 | * in the LICENSE file that accompanied this code). | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License | |
| 17 | * version 2 along with this program; If not, see | |
| 18 | * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf | |
| 19 | * | |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 22 | * have any questions. | |
| 23 | * | |
| 24 | * GPL HEADER END | |
| 25 | */ | |
| 26 | /* | |
| 27 | * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 28 | * Use is subject to license terms. | |
| 29 | */ | |
| 30 | /* | |
| 31 | * This file is part of Lustre, http://www.lustre.org/ | |
| 32 | * Lustre is a trademark of Sun Microsystems, Inc. | |
| 33 | * | |
| 34 | * Implementation of cl_lock for VVP layer. | |
| 35 | * | |
| 36 | * Author: Nikita Danilov <nikita.danilov@sun.com> | |
| 37 | */ | |
| 38 | ||
| 39 | #define DEBUG_SUBSYSTEM S_LLITE | |
| 40 | ||
| 41 | ||
| 42 | #include <obd.h> | |
| 43 | #include <lustre_lite.h> | |
| 44 | ||
| 45 | #include "vvp_internal.h" | |
| 46 | ||
| 47 | /***************************************************************************** | |
| 48 | * | |
| 49 | * Vvp lock functions. | |
| 50 | * | |
| 51 | */ | |
| 52 | ||
| 53 | /** | |
| 54 | * Estimates lock value for the purpose of managing the lock cache during | |
| 55 | * memory shortages. | |
| 56 | * | |
| 57 | * Locks for memory mapped files are almost infinitely precious, others are | |
| 58 | * junk. "Mapped locks" are heavy, but not infinitely heavy, so that they are | |
| 59 | * ordered within themselves by weights assigned from other layers. | |
| 60 | */ | |
| 61 | static unsigned long vvp_lock_weigh(const struct lu_env *env, | |
| 62 | const struct cl_lock_slice *slice) | |
| 63 | { | |
| 64 | struct ccc_object *cob = cl2ccc(slice->cls_obj); | |
| 65 | ||
| 0a3bdb00 | 66 | return atomic_read(&cob->cob_mmap_cnt) > 0 ? ~0UL >> 2 : 0; |
| d7e09d03 PT |
67 | } |
| 68 | ||
| 69 | static const struct cl_lock_operations vvp_lock_ops = { | |
| 70 | .clo_delete = ccc_lock_delete, | |
| 71 | .clo_fini = ccc_lock_fini, | |
| 72 | .clo_enqueue = ccc_lock_enqueue, | |
| 73 | .clo_wait = ccc_lock_wait, | |
| 74 | .clo_unuse = ccc_lock_unuse, | |
| 75 | .clo_fits_into = ccc_lock_fits_into, | |
| 76 | .clo_state = ccc_lock_state, | |
| 77 | .clo_weigh = vvp_lock_weigh | |
| 78 | }; | |
| 79 | ||
| 80 | int vvp_lock_init(const struct lu_env *env, struct cl_object *obj, | |
| 81 | struct cl_lock *lock, const struct cl_io *io) | |
| 82 | { | |
| 83 | return ccc_lock_init(env, obj, lock, io, &vvp_lock_ops); | |
| 84 | } |