diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/glimpse.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/drivers/staging/lustre/lustre/llite/glimpse.c b/drivers/staging/lustre/lustre/llite/glimpse.c deleted file mode 100644 index ce0d51767da3..000000000000 --- a/drivers/staging/lustre/lustre/llite/glimpse.c +++ /dev/null @@ -1,205 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * GPL HEADER START - * - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 only, - * 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 version 2 for more details (a copy is included - * in the LICENSE file that accompanied this code). - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; If not, see - * http://www.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2011, 2012, Intel Corporation. - */ -/* - * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. - * - * glimpse code shared between vvp and liblustre (and other Lustre clients in - * the future). - * - * Author: Nikita Danilov <nikita.danilov@sun.com> - * Author: Oleg Drokin <oleg.drokin@sun.com> - */ - -#include <obd_class.h> -#include <obd_support.h> -#include <obd.h> - -#include <lustre_dlm.h> -#include <lustre_mdc.h> -#include <linux/pagemap.h> -#include <linux/file.h> - -#include <cl_object.h> -#include "llite_internal.h" - -static const struct cl_lock_descr whole_file = { - .cld_start = 0, - .cld_end = CL_PAGE_EOF, - .cld_mode = CLM_READ -}; - -/* - * Check whether file has possible unwriten pages. - * - * \retval 1 file is mmap-ed or has dirty pages - * 0 otherwise - */ -blkcnt_t dirty_cnt(struct inode *inode) -{ - blkcnt_t cnt = 0; - struct vvp_object *vob = cl_inode2vvp(inode); - void *results[1]; - - if (inode->i_mapping) - cnt += radix_tree_gang_lookup_tag(&inode->i_mapping->i_pages, - results, 0, 1, - PAGECACHE_TAG_DIRTY); - if (cnt == 0 && atomic_read(&vob->vob_mmap_cnt) > 0) - cnt = 1; - - return (cnt > 0) ? 1 : 0; -} - -int cl_glimpse_lock(const struct lu_env *env, struct cl_io *io, - struct inode *inode, struct cl_object *clob, int agl) -{ - const struct lu_fid *fid = lu_object_fid(&clob->co_lu); - struct cl_lock *lock = vvp_env_lock(env); - struct cl_lock_descr *descr = &lock->cll_descr; - int result = 0; - - CDEBUG(D_DLMTRACE, "Glimpsing inode " DFID "\n", PFID(fid)); - - /* NOTE: this looks like DLM lock request, but it may - * not be one. Due to CEF_ASYNC flag (translated - * to LDLM_FL_HAS_INTENT by osc), this is - * glimpse request, that won't revoke any - * conflicting DLM locks held. Instead, - * ll_glimpse_callback() will be called on each - * client holding a DLM lock against this file, - * and resulting size will be returned for each - * stripe. DLM lock on [0, EOF] is acquired only - * if there were no conflicting locks. If there - * were conflicting locks, enqueuing or waiting - * fails with -ENAVAIL, but valid inode - * attributes are returned anyway. - */ - *descr = whole_file; - descr->cld_obj = clob; - descr->cld_mode = CLM_READ; - descr->cld_enq_flags = CEF_ASYNC | CEF_MUST; - if (agl) - descr->cld_enq_flags |= CEF_AGL; - /* - * CEF_ASYNC is used because glimpse sub-locks cannot - * deadlock (because they never conflict with other - * locks) and, hence, can be enqueued out-of-order. - * - * CEF_MUST protects glimpse lock from conversion into - * a lockless mode. - */ - result = cl_lock_request(env, io, lock); - if (result < 0) - return result; - - if (!agl) { - ll_merge_attr(env, inode); - if (i_size_read(inode) > 0 && !inode->i_blocks) { - /* - * LU-417: Add dirty pages block count - * lest i_blocks reports 0, some "cp" or - * "tar" may think it's a completely - * sparse file and skip it. - */ - inode->i_blocks = dirty_cnt(inode); - } - } - - cl_lock_release(env, lock); - - return result; -} - -static int cl_io_get(struct inode *inode, struct lu_env **envout, - struct cl_io **ioout, u16 *refcheck) -{ - struct lu_env *env; - struct cl_io *io; - struct ll_inode_info *lli = ll_i2info(inode); - struct cl_object *clob = lli->lli_clob; - int result; - - if (S_ISREG(inode->i_mode)) { - env = cl_env_get(refcheck); - if (!IS_ERR(env)) { - io = vvp_env_thread_io(env); - io->ci_obj = clob; - *envout = env; - *ioout = io; - result = 1; - } else { - result = PTR_ERR(env); - } - } else { - result = 0; - } - return result; -} - -int cl_glimpse_size0(struct inode *inode, int agl) -{ - /* - * We don't need ast_flags argument to cl_glimpse_size(), because - * osc_lock_enqueue() takes care of the possible deadlock that said - * argument was introduced to avoid. - */ - /* - * XXX but note that ll_file_seek() passes LDLM_FL_BLOCK_NOWAIT to - * cl_glimpse_size(), which doesn't make sense: glimpse locks are not - * blocking anyway. - */ - struct lu_env *env = NULL; - struct cl_io *io = NULL; - int result; - u16 refcheck; - - result = cl_io_get(inode, &env, &io, &refcheck); - if (result > 0) { -again: - io->ci_verify_layout = 1; - result = cl_io_init(env, io, CIT_MISC, io->ci_obj); - if (result > 0) - /* - * nothing to do for this io. This currently happens - * when stripe sub-object's are not yet created. - */ - result = io->ci_result; - else if (result == 0) - result = cl_glimpse_lock(env, io, inode, io->ci_obj, - agl); - - OBD_FAIL_TIMEOUT(OBD_FAIL_GLIMPSE_DELAY, 2); - cl_io_fini(env, io); - if (unlikely(io->ci_need_restart)) - goto again; - cl_env_put(env, &refcheck); - } - return result; -} |