4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
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
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * glimpse code shared between vvp and liblustre (and other Lustre clients in
39 * Author: Nikita Danilov <nikita.danilov@sun.com>
40 * Author: Oleg Drokin <oleg.drokin@sun.com>
43 #include <libcfs/libcfs.h>
44 #include <obd_class.h>
45 #include <obd_support.h>
49 # include <lustre_dlm.h>
50 # include <lustre_lite.h>
51 # include <lustre_mdc.h>
52 # include <linux/pagemap.h>
53 # include <linux/file.h>
59 #include <sys/types.h>
61 #include <sys/queue.h>
63 #include <liblustre.h>
66 #include "cl_object.h"
69 # include "../llite/llite_internal.h"
71 # include "../liblustre/llite_lib.h"
74 static const struct cl_lock_descr whole_file = {
76 .cld_end = CL_PAGE_EOF,
81 * Check whether file has possible unwriten pages.
83 * \retval 1 file is mmap-ed or has dirty pages
86 blkcnt_t dirty_cnt(struct inode *inode)
90 struct ccc_object *vob = cl_inode2ccc(inode);
93 if (inode->i_mapping != NULL)
94 cnt += radix_tree_gang_lookup_tag(&inode->i_mapping->page_tree,
97 if (cnt == 0 && cfs_atomic_read(&vob->cob_mmap_cnt) > 0)
101 return (cnt > 0) ? 1 : 0;
104 int cl_glimpse_lock(const struct lu_env *env, struct cl_io *io,
105 struct inode *inode, struct cl_object *clob, int agl)
107 struct cl_lock_descr *descr = &ccc_env_info(env)->cti_descr;
108 struct cl_inode_info *lli = cl_i2info(inode);
109 const struct lu_fid *fid = lu_object_fid(&clob->co_lu);
110 struct ccc_io *cio = ccc_env_io(env);
111 struct cl_lock *lock;
116 if (!(lli->lli_flags & LLIF_MDS_SIZE_LOCK)) {
117 CDEBUG(D_DLMTRACE, "Glimpsing inode "DFID"\n", PFID(fid));
119 /* NOTE: this looks like DLM lock request, but it may
120 * not be one. Due to CEF_ASYNC flag (translated
121 * to LDLM_FL_HAS_INTENT by osc), this is
122 * glimpse request, that won't revoke any
123 * conflicting DLM locks held. Instead,
124 * ll_glimpse_callback() will be called on each
125 * client holding a DLM lock against this file,
126 * and resulting size will be returned for each
127 * stripe. DLM lock on [0, EOF] is acquired only
128 * if there were no conflicting locks. If there
129 * were conflicting locks, enqueuing or waiting
130 * fails with -ENAVAIL, but valid inode
131 * attributes are returned anyway. */
133 descr->cld_obj = clob;
134 descr->cld_mode = CLM_PHANTOM;
135 descr->cld_enq_flags = CEF_ASYNC | CEF_MUST;
137 descr->cld_enq_flags |= CEF_AGL;
138 cio->cui_glimpse = 1;
140 * CEF_ASYNC is used because glimpse sub-locks cannot
141 * deadlock (because they never conflict with other
142 * locks) and, hence, can be enqueued out-of-order.
144 * CEF_MUST protects glimpse lock from conversion into
147 lock = cl_lock_request(env, io, descr, "glimpse",
149 cio->cui_glimpse = 0;
155 RETURN(PTR_ERR(lock));
158 result = cl_wait(env, lock);
161 if (cl_isize_read(inode) > 0 &&
162 inode->i_blocks == 0) {
164 * LU-417: Add dirty pages block count
165 * lest i_blocks reports 0, some "cp" or
166 * "tar" may think it's a completely
167 * sparse file and skip it.
169 inode->i_blocks = dirty_cnt(inode);
173 cl_lock_release(env, lock, "glimpse", cfs_current());
175 CDEBUG(D_DLMTRACE, "No objects for inode\n");
182 static int cl_io_get(struct inode *inode, struct lu_env **envout,
183 struct cl_io **ioout, int *refcheck)
187 struct cl_inode_info *lli = cl_i2info(inode);
188 struct cl_object *clob = lli->lli_clob;
191 if (S_ISREG(cl_inode_mode(inode))) {
192 env = cl_env_get(refcheck);
194 io = ccc_env_thread_io(env);
200 result = PTR_ERR(env);
206 int cl_glimpse_size0(struct inode *inode, int agl)
209 * We don't need ast_flags argument to cl_glimpse_size(), because
210 * osc_lock_enqueue() takes care of the possible deadlock that said
211 * argument was introduced to avoid.
214 * XXX but note that ll_file_seek() passes LDLM_FL_BLOCK_NOWAIT to
215 * cl_glimpse_size(), which doesn't make sense: glimpse locks are not
218 struct lu_env *env = NULL;
219 struct cl_io *io = NULL;
225 result = cl_io_get(inode, &env, &io, &refcheck);
227 result = cl_io_init(env, io, CIT_MISC, io->ci_obj);
230 * nothing to do for this io. This currently happens
231 * when stripe sub-object's are not yet created.
233 result = io->ci_result;
234 else if (result == 0)
235 result = cl_glimpse_lock(env, io, inode, io->ci_obj,
238 cl_env_put(env, &refcheck);
243 int cl_local_size(struct inode *inode)
245 struct lu_env *env = NULL;
246 struct cl_io *io = NULL;
247 struct ccc_thread_info *cti;
248 struct cl_object *clob;
249 struct cl_lock_descr *descr;
250 struct cl_lock *lock;
256 if (!cl_i2info(inode)->lli_smd)
259 result = cl_io_get(inode, &env, &io, &refcheck);
264 result = cl_io_init(env, io, CIT_MISC, clob);
266 result = io->ci_result;
267 else if (result == 0) {
268 cti = ccc_env_info(env);
269 descr = &cti->cti_descr;
272 descr->cld_obj = clob;
273 lock = cl_lock_peek(env, io, descr, "localsize", cfs_current());
277 cl_lock_release(env, lock, "localsize", cfs_current());
283 cl_env_put(env, &refcheck);