1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/sched.h>
24 #include <linux/smp_lock.h>
25 #include <linux/quotaops.h>
27 #define DEBUG_SUBSYSTEM S_LLITE
29 #include <linux/obd_support.h>
30 #include <linux/lustre_lite.h>
31 #include <linux/lustre_idl.h>
32 #include <linux/lustre_dlm.h>
33 #include <linux/lustre_version.h>
35 #include "llite_internal.h"
37 /* should NOT be called with the dcache lock, see fs/dcache.c */
38 static void ll_release(struct dentry *de)
40 struct ll_dentry_data *lld;
45 LASSERT(lld->lld_cwd_count == 0);
46 LASSERT(lld->lld_mnt_count == 0);
47 OBD_FREE(de->d_fsdata, sizeof(*lld));
52 /* Compare if two dentries are the same. Don't match if the existing dentry
53 * is marked DCACHE_LUSTRE_INVALID. Returns 1 if different, 0 if the same.
55 * This avoids a race where ll_lookup_it() instantiates a dentry, but we get
56 * an AST before calling d_revalidate_it(). The dentry still exists (marked
57 * INVALID) so d_lookup() matches it, but we have no lock on it (so
58 * lock_match() fails) and we spin around real_lookup(). */
59 static int ll_dcompare(struct dentry *parent, struct qstr *d_name,
62 struct dentry *dchild;
65 if (d_name->len != name->len)
68 if (memcmp(d_name->name, name->name, name->len))
71 dchild = container_of(d_name, struct dentry, d_name); /* ugh */
72 if (dchild->d_flags & DCACHE_LUSTRE_INVALID) {
73 CDEBUG(D_DENTRY,"INVALID dentry %p not matched, was bug 3784\n",
81 /* should NOT be called with the dcache lock, see fs/dcache.c */
82 static int ll_ddelete(struct dentry *de)
86 CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
87 (de->d_flags & DCACHE_LUSTRE_INVALID ? "deleting" : "keeping"),
88 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
89 d_unhashed(de) ? "" : "hashed,",
90 list_empty(&de->d_subdirs) ? "" : "subdirs");
94 void ll_set_dd(struct dentry *de)
99 CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
100 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
101 atomic_read(&de->d_count));
103 if (de->d_fsdata == NULL) {
104 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
111 void ll_intent_drop_lock(struct lookup_intent *it)
113 struct lustre_handle *handle;
115 if (it->it_op && it->d.lustre.it_lock_mode) {
116 handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
117 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
118 " from it %p\n", handle->cookie, it);
119 ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
121 /* bug 494: intent_release may be called multiple times, from
122 * this thread and we don't want to double-decref this lock */
123 it->d.lustre.it_lock_mode = 0;
127 void ll_intent_release(struct lookup_intent *it)
131 ll_intent_drop_lock(it);
133 it->it_op_release = 0;
134 it->d.lustre.it_disposition = 0;
135 it->d.lustre.it_data = NULL;
139 void ll_unhash_aliases(struct inode *inode)
141 struct list_head *tmp, *head;
142 struct ll_sb_info *sbi;
146 CERROR("unexpected NULL inode, tell phil\n");
150 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
151 inode->i_ino, inode->i_generation, inode);
153 sbi = ll_i2sbi(inode);
154 head = &inode->i_dentry;
156 spin_lock(&dcache_lock);
158 while ((tmp = tmp->next) != head) {
159 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
160 if (atomic_read(&dentry->d_count) == 0) {
161 CDEBUG(D_DENTRY, "deleting dentry %.*s (%p) parent %p "
162 "inode %p\n", dentry->d_name.len,
163 dentry->d_name.name, dentry, dentry->d_parent,
167 spin_unlock(&dcache_lock);
170 } else if (!(dentry->d_flags & DCACHE_LUSTRE_INVALID)) {
171 CDEBUG(D_DENTRY, "unhashing dentry %.*s (%p) parent %p "
172 "inode %p refc %d\n", dentry->d_name.len,
173 dentry->d_name.name, dentry, dentry->d_parent,
174 dentry->d_inode, atomic_read(&dentry->d_count));
175 hlist_del_init(&dentry->d_hash);
176 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
177 hlist_add_head(&dentry->d_hash,
178 &sbi->ll_orphan_dentry_list);
181 spin_unlock(&dcache_lock);
185 static int revalidate_it_finish(struct ptlrpc_request *request, int offset,
186 struct lookup_intent *it,
189 struct ll_sb_info *sbi;
196 if (it_disposition(it, DISP_LOOKUP_NEG))
199 sbi = ll_i2sbi(de->d_inode);
200 rc = ll_prep_inode(sbi->ll_osc_exp, &de->d_inode, request, offset,NULL);
205 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
208 LASSERT(dentry != NULL);
210 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
211 struct inode *inode = dentry->d_inode;
212 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
213 inode, inode->i_ino, inode->i_generation);
214 mdc_set_lock_data(&it->d.lustre.it_lock_handle, inode);
217 /* drop lookup or getattr locks immediately */
218 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
220 /* on 2.6 there are situation when several lookups and
221 * revalidations may be requested during single operation.
222 * therefore, we don't release intent here -bzzz */
223 ll_intent_drop_lock(it);
225 ll_intent_release(it);
230 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
232 struct lookup_intent *it = *itp;
233 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
235 LASSERTF(it->it_magic == INTENT_MAGIC, "bad intent magic: %x\n",
240 if (!it || it->it_op == IT_GETXATTR)
243 it->it_op_release = ll_intent_release;
246 int ll_revalidate_it(struct dentry *de, int flags, struct lookup_intent *it)
249 struct ll_fid pfid, cfid;
250 struct it_cb_data icbd;
251 struct ll_uctxt ctxt;
252 struct ptlrpc_request *req = NULL;
253 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
254 struct obd_export *exp;
257 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
260 /* Cached negative dentries are unsafe for now - look them up again */
261 if (de->d_inode == NULL)
264 exp = ll_i2mdcexp(de->d_inode);
265 ll_inode2fid(&pfid, de->d_parent->d_inode);
266 ll_inode2fid(&cfid, de->d_inode);
267 icbd.icbd_parent = de->d_parent->d_inode;
268 icbd.icbd_childp = &de;
270 /* Never execute intents for mount points.
271 * Attributes will be fixed up in ll_inode_revalidate_it */
272 if (d_mountpoint(de))
275 OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_REVALIDATE_PAUSE, 5);
276 ll_frob_intent(&it, &lookup_it);
279 ll_i2uctxt(&ctxt, de->d_parent->d_inode, de->d_inode);
281 rc = mdc_intent_lock(exp, &ctxt, &pfid, de->d_name.name, de->d_name.len,
283 &cfid, it, flags, &req, ll_mdc_blocking_ast);
284 /* If req is NULL, then mdc_intent_lock only tried to do a lock match;
285 * if all was well, it will return 1 if it found locks, 0 otherwise. */
286 if (req == NULL && rc >= 0)
291 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
292 "%d\n", rc, it->d.lustre.it_status);
297 rc = revalidate_it_finish(req, 1, it, de);
299 ll_intent_release(it);
304 /* unfortunately ll_intent_lock may cause a callback and revoke our
306 spin_lock(&dcache_lock);
307 hlist_del_init(&de->d_hash);
309 spin_unlock(&dcache_lock);
312 if (req != NULL && rc == 1)
313 ptlrpc_req_finished(req);
315 ll_unhash_aliases(de->d_inode);
316 /* done in ll_unhash_aliases()
317 dentry->d_flags |= DCACHE_LUSTRE_INVALID; */
319 CDEBUG(D_DENTRY, "revalidated dentry %.*s (%p) parent %p "
320 "inode %p refc %d\n", de->d_name.len,
321 de->d_name.name, de, de->d_parent, de->d_inode,
322 atomic_read(&de->d_count));
323 ll_lookup_finish_locks(it, de);
324 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
329 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
331 struct inode *inode= de->d_inode;
332 struct ll_sb_info *sbi = ll_i2sbi(inode);
333 struct ll_dentry_data *ldd = ll_d2d(de);
334 struct obd_client_handle *handle;
340 /* Strictly speaking this introduces an additional race: the
341 * increments should wait until the rpc has returned.
342 * However, given that at present the function is void, this
344 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
350 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
357 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
358 rc = obd_pin(sbi->ll_mdc_exp, inode->i_ino, inode->i_generation,
359 inode->i_mode & S_IFMT, handle, flag);
363 memset(handle, 0, sizeof(*handle));
365 ldd->lld_cwd_count--;
367 ldd->lld_mnt_count--;
375 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
377 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
378 struct ll_dentry_data *ldd = ll_d2d(de);
379 struct obd_client_handle handle;
385 /* Strictly speaking this introduces an additional race: the
386 * increments should wait until the rpc has returned.
387 * However, given that at present the function is void, this
389 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
390 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
391 /* the "pin" failed */
398 count = --ldd->lld_mnt_count;
400 count = --ldd->lld_cwd_count;
408 rc = obd_unpin(sbi->ll_mdc_exp, &handle, flag);
413 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
414 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
419 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
420 rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
422 rc = ll_revalidate_it(dentry, 0, NULL);
428 struct dentry_operations ll_d_ops = {
429 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
430 .d_revalidate = ll_revalidate_nd,
432 .d_revalidate_it = ll_revalidate_it,
434 .d_release = ll_release,
435 .d_delete = ll_ddelete,
436 .d_compare = ll_dcompare,