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(struct ll_dentry_data));
52 void ll_set_dd(struct dentry *de)
58 if (de->d_fsdata == NULL) {
59 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
66 void ll_intent_drop_lock(struct lookup_intent *it)
68 struct lustre_handle *handle;
70 if (it->it_op && it->d.lustre.it_lock_mode) {
71 handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
72 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
73 " from it %p\n", handle->cookie, it);
74 ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
76 /* bug 494: intent_release may be called multiple times, from
77 * this thread and we don't want to double-decref this lock */
78 it->d.lustre.it_lock_mode = 0;
82 void ll_intent_release(struct lookup_intent *it)
86 ll_intent_drop_lock(it);
88 it->it_op_release = 0;
89 it->d.lustre.it_disposition = 0;
90 it->d.lustre.it_data = NULL;
94 void ll_unhash_aliases(struct inode *inode)
96 struct list_head *tmp, *head;
97 struct ll_sb_info *sbi;
100 sbi = ll_i2sbi(inode);
102 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
103 inode->i_ino, inode->i_generation, inode);
106 CERROR("unexpected NULL inode, tell phil\n");
109 head = &inode->i_dentry;
111 spin_lock(&dcache_lock);
113 while ((tmp = tmp->next) != head) {
114 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
115 CDEBUG(D_INODE, "invalidate 0x%p: %*s -> %lu/%lu\n",
116 dentry, dentry->d_name.len, dentry->d_name.name,
117 (unsigned long) dentry->d_inode->i_ino,
118 (unsigned long) dentry->d_inode->i_generation);
119 if (!atomic_read(&dentry->d_count)) {
122 spin_unlock(&dcache_lock);
126 hlist_del_init(&dentry->d_hash);
127 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
128 hlist_add_head(&dentry->d_hash,
129 &sbi->ll_orphan_dentry_list);
132 spin_unlock(&dcache_lock);
136 extern struct dentry *ll_find_alias(struct inode *, struct dentry *);
138 static int revalidate_it_finish(struct ptlrpc_request *request, int offset,
139 struct lookup_intent *it,
142 struct ll_sb_info *sbi;
149 if (it_disposition(it, DISP_LOOKUP_NEG))
152 sbi = ll_i2sbi(de->d_inode);
153 rc = ll_prep_inode(sbi->ll_osc_exp, sbi->ll_mdc_exp,
154 &de->d_inode, request, offset,NULL);
159 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
162 LASSERT(dentry != NULL);
164 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
165 struct inode *inode = dentry->d_inode;
166 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
167 inode, inode->i_ino, inode->i_generation);
168 mdc_set_lock_data(&it->d.lustre.it_lock_handle, inode);
171 /* drop lookup or getattr locks immediately */
172 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
173 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
174 /* on 2.6 there are situation when several lookups and
175 * revalidations may be requested during single operation.
176 * therefore, we don't release intent here -bzzz */
177 ll_intent_drop_lock(it);
179 ll_intent_release(it);
184 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
186 struct lookup_intent *it = *itp;
187 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
188 if (it && it->it_magic != INTENT_MAGIC) {
189 CERROR("WARNING: uninitialized intent\n");
192 if (it && (it->it_op == IT_GETATTR || it->it_op == 0))
193 it->it_op = IT_LOOKUP;
196 if (!it || it->it_op == IT_GETXATTR)
199 it->it_op_release = ll_intent_release;
202 int ll_revalidate_it(struct dentry *de, int flags, struct lookup_intent *it)
205 struct ll_fid pfid, cfid;
206 struct it_cb_data icbd;
207 struct ll_uctxt ctxt;
208 struct ptlrpc_request *req = NULL;
209 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
210 struct obd_export *exp;
213 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
216 /* Cached negative dentries are unsafe for now - look them up again */
217 if (de->d_inode == NULL)
220 CDEBUG(D_INODE, "revalidate 0x%p: %*s -> %lu/%lu\n",
221 de, de->d_name.len, de->d_name.name,
222 (unsigned long) de->d_inode->i_ino,
223 (unsigned long) de->d_inode->i_generation);
225 exp = ll_i2mdcexp(de->d_inode);
226 ll_inode2fid(&pfid, de->d_parent->d_inode);
227 ll_inode2fid(&cfid, de->d_inode);
228 icbd.icbd_parent = de->d_parent->d_inode;
229 icbd.icbd_childp = &de;
231 /* Never execute intents for mount points.
232 * Attributes will be fixed up in ll_inode_revalidate_it */
233 if (d_mountpoint(de))
236 ll_frob_intent(&it, &lookup_it);
239 ll_i2uctxt(&ctxt, de->d_parent->d_inode, de->d_inode);
241 if (it->it_op == IT_GETATTR) { /* We need to check for LOOKUP lock
243 rc = md_intent_lock(exp, &ctxt, &pfid, de->d_name.name,
244 de->d_name.len, NULL, 0, &cfid, &lookup_it,
245 flags, &req, ll_mdc_blocking_ast);
246 /* If there was no lookup lock, no point in even checking for
252 if (it_disposition(&lookup_it, DISP_LOOKUP_NEG)) {
253 ll_intent_release(&lookup_it);
259 ptlrpc_req_finished(req);
261 ll_lookup_finish_locks(&lookup_it, de);
264 rc = md_intent_lock(exp, &ctxt, &pfid, de->d_name.name, de->d_name.len,
265 NULL, 0, &cfid, it, flags, &req, ll_mdc_blocking_ast);
266 /* If req is NULL, then md_intent_lock only tried to do a lock match;
267 * if all was well, it will return 1 if it found locks, 0 otherwise. */
268 if (req == NULL && rc >= 0)
273 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
274 "%d\n", rc, it->d.lustre.it_status);
279 rc = revalidate_it_finish(req, 1, it, de);
281 ll_intent_release(it);
286 /* unfortunately ll_intent_lock may cause a callback and revoke our
288 spin_lock(&dcache_lock);
289 hlist_del_init(&de->d_hash);
291 spin_unlock(&dcache_lock);
294 if (req != NULL && rc == 1)
295 ptlrpc_req_finished(req);
297 ll_unhash_aliases(de->d_inode);
298 de->d_flags |= DCACHE_LUSTRE_INVALID;
300 ll_lookup_finish_locks(it, de);
301 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
306 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
308 struct inode *inode= de->d_inode;
309 struct ll_sb_info *sbi = ll_i2sbi(inode);
310 struct ll_dentry_data *ldd = ll_d2d(de);
311 struct obd_client_handle *handle;
317 /* Strictly speaking this introduces an additional race: the
318 * increments should wait until the rpc has returned.
319 * However, given that at present the function is void, this
321 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
327 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
334 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
335 rc = obd_pin(sbi->ll_mdc_exp, inode->i_ino, inode->i_generation,
336 inode->i_mode & S_IFMT, handle, flag);
340 memset(handle, 0, sizeof(*handle));
342 ldd->lld_cwd_count--;
344 ldd->lld_mnt_count--;
352 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
354 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
355 struct ll_dentry_data *ldd = ll_d2d(de);
356 struct obd_client_handle handle;
362 /* Strictly speaking this introduces an additional race: the
363 * increments should wait until the rpc has returned.
364 * However, given that at present the function is void, this
366 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
367 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
368 /* the "pin" failed */
375 count = --ldd->lld_mnt_count;
377 count = --ldd->lld_cwd_count;
385 rc = obd_unpin(sbi->ll_mdc_exp, &handle, flag);
390 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
391 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
396 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
397 rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
399 rc = ll_revalidate_it(dentry, 0, NULL);
405 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
406 static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
408 struct ll_sb_info *sbi = ll_i2sbi(inode);
409 struct ll_fid parent, child;
411 LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
412 ll_inode2fid(&parent, dentry->d_parent->d_inode);
413 ll_inode2fid(&child, inode);
414 md_change_cbdata_name(sbi->ll_mdc_exp, &parent,
415 (char *)dentry->d_name.name, dentry->d_name.len,
416 &child, null_if_equal, inode);
420 #error "implement ->d_iput() for 2.6"
423 struct dentry_operations ll_d_ops = {
424 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
425 .d_revalidate = ll_revalidate_nd,
427 .d_revalidate_it = ll_revalidate_it,
429 .d_release = ll_release,
430 .d_iput = ll_dentry_iput,