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 /* should NOT be called with the dcache lock, see fs/dcache.c */
53 static int ll_ddelete(struct dentry *de)
57 CDEBUG(D_DENTRY, "%s dentry %*s (%p, parent %p, inode %p) %s%s\n",
58 (de->d_flags & DCACHE_LUSTRE_INVALID ? "keeping" : "deleting"),
59 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
60 d_unhashed(de) ? "" : "hashed,",
61 list_empty(&de->d_subdirs) ? "" : "subdirs");
65 void ll_set_dd(struct dentry *de)
70 CDEBUG(D_DENTRY, "ldd on dentry %*s (%p) parent %p inode %p refc %d\n",
71 de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
72 atomic_read(&de->d_count));
74 if (de->d_fsdata == NULL) {
75 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
82 void ll_intent_drop_lock(struct lookup_intent *it)
84 struct lustre_handle *handle;
86 if (it->it_op && it->d.lustre.it_lock_mode) {
87 handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
88 CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
89 " from it %p\n", handle->cookie, it);
90 ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
92 /* bug 494: intent_release may be called multiple times, from
93 * this thread and we don't want to double-decref this lock */
94 it->d.lustre.it_lock_mode = 0;
98 void ll_intent_release(struct lookup_intent *it)
102 ll_intent_drop_lock(it);
104 it->it_op_release = 0;
105 it->d.lustre.it_disposition = 0;
106 it->d.lustre.it_data = NULL;
110 void ll_unhash_aliases(struct inode *inode)
112 struct list_head *tmp, *head;
113 struct ll_sb_info *sbi;
117 CERROR("unexpected NULL inode, tell phil\n");
121 CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
122 inode->i_ino, inode->i_generation, inode);
124 sbi = ll_i2sbi(inode);
125 head = &inode->i_dentry;
127 spin_lock(&dcache_lock);
129 while ((tmp = tmp->next) != head) {
130 struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
131 if (atomic_read(&dentry->d_count) == 0) {
132 CDEBUG(D_DENTRY, "deleting dentry %*s (%p) parent %p "
133 "inode %p\n", dentry->d_name.len,
134 dentry->d_name.name, dentry, dentry->d_parent,
138 spin_unlock(&dcache_lock);
141 } else if (!(dentry->d_flags & DCACHE_LUSTRE_INVALID)) {
142 CDEBUG(D_DENTRY, "unhashing dentry %*s (%p) parent %p "
143 "inode %p refc %d\n", dentry->d_name.len,
144 dentry->d_name.name, dentry, dentry->d_parent,
145 dentry->d_inode, atomic_read(&dentry->d_count));
146 hlist_del_init(&dentry->d_hash);
147 dentry->d_flags |= DCACHE_LUSTRE_INVALID;
148 hlist_add_head(&dentry->d_hash,
149 &sbi->ll_orphan_dentry_list);
152 spin_unlock(&dcache_lock);
156 extern struct dentry *ll_find_alias(struct inode *, struct dentry *);
158 static int revalidate_it_finish(struct ptlrpc_request *request,
159 int offset, struct lookup_intent *it,
162 struct ll_sb_info *sbi;
169 if (it_disposition(it, DISP_LOOKUP_NEG))
172 sbi = ll_i2sbi(de->d_inode);
173 rc = ll_prep_inode(sbi->ll_osc_exp, sbi->ll_mdc_exp,
174 &de->d_inode, request, offset, NULL);
179 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
182 LASSERT(dentry != NULL);
184 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
185 struct inode *inode = dentry->d_inode;
186 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
187 inode, inode->i_ino, inode->i_generation);
188 mdc_set_lock_data(NULL, &it->d.lustre.it_lock_handle, inode);
191 /* drop lookup or getattr locks immediately */
192 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
193 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
194 /* on 2.6 there are situation when several lookups and
195 * revalidations may be requested during single operation.
196 * therefore, we don't release intent here -bzzz */
197 ll_intent_drop_lock(it);
199 ll_intent_release(it);
204 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
206 struct lookup_intent *it = *itp;
207 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
208 if (it && it->it_magic != INTENT_MAGIC) {
209 CERROR("WARNING: uninitialized intent\n");
212 if (it && (it->it_op == IT_GETATTR || it->it_op == 0))
213 it->it_op = IT_LOOKUP;
216 if (!it || it->it_op == IT_GETXATTR)
219 it->it_op_release = ll_intent_release;
222 int ll_revalidate_it(struct dentry *de, int flags, struct lookup_intent *it)
225 struct ll_fid pfid, cfid;
226 struct it_cb_data icbd;
227 struct ll_uctxt ctxt;
228 struct ptlrpc_request *req = NULL;
229 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
230 struct obd_export *exp;
233 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
236 /* Cached negative dentries are unsafe for now - look them up again */
237 if (de->d_inode == NULL)
240 CDEBUG(D_INODE, "revalidate 0x%p: %*s -> %lu/%lu\n",
241 de, de->d_name.len, de->d_name.name,
242 (unsigned long) de->d_inode->i_ino,
243 (unsigned long) de->d_inode->i_generation);
245 exp = ll_i2mdcexp(de->d_inode);
246 ll_inode2fid(&pfid, de->d_parent->d_inode);
247 ll_inode2fid(&cfid, de->d_inode);
248 icbd.icbd_parent = de->d_parent->d_inode;
249 icbd.icbd_childp = &de;
251 /* Never execute intents for mount points.
252 * Attributes will be fixed up in ll_inode_revalidate_it */
253 if (d_mountpoint(de))
256 ll_frob_intent(&it, &lookup_it);
259 ll_i2uctxt(&ctxt, de->d_parent->d_inode, de->d_inode);
261 if (it->it_op == IT_GETATTR) { /* We need to check for LOOKUP lock
263 rc = md_intent_lock(exp, &ctxt, &pfid, de->d_name.name,
264 de->d_name.len, NULL, 0, &cfid, &lookup_it,
265 flags, &req, ll_mdc_blocking_ast);
266 /* If there was no lookup lock, no point in even checking for
272 if (it_disposition(&lookup_it, DISP_LOOKUP_NEG)) {
273 ll_intent_release(&lookup_it);
279 ptlrpc_req_finished(req);
281 ll_lookup_finish_locks(&lookup_it, de);
284 rc = md_intent_lock(exp, &ctxt, &pfid, de->d_name.name, de->d_name.len,
285 NULL, 0, &cfid, it, flags, &req,
286 ll_mdc_blocking_ast);
287 /* If req is NULL, then mdc_intent_lock only tried to do a lock match;
288 * if all was well, it will return 1 if it found locks, 0 otherwise. */
289 if (req == NULL && rc >= 0)
294 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
295 "%d\n", rc, it->d.lustre.it_status);
300 rc = revalidate_it_finish(req, 1, it, de);
302 ll_intent_release(it);
307 /* unfortunately ll_intent_lock may cause a callback and revoke our
309 spin_lock(&dcache_lock);
310 hlist_del_init(&de->d_hash);
312 spin_unlock(&dcache_lock);
315 if (req != NULL && rc == 1)
316 ptlrpc_req_finished(req);
318 ll_unhash_aliases(de->d_inode);
319 /* done in ll_unhash_aliases()
320 de->d_flags |= DCACHE_LUSTRE_INVALID; */
322 CDEBUG(D_DENTRY, "revalidated dentry %*s (%p) parent %p "
323 "inode %p refc %d\n", de->d_name.len,
324 de->d_name.name, de, de->d_parent, de->d_inode,
325 atomic_read(&de->d_count));
326 ll_lookup_finish_locks(it, de);
327 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
332 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
334 struct inode *inode= de->d_inode;
335 struct ll_sb_info *sbi = ll_i2sbi(inode);
336 struct ll_dentry_data *ldd = ll_d2d(de);
337 struct obd_client_handle *handle;
343 /* Strictly speaking this introduces an additional race: the
344 * increments should wait until the rpc has returned.
345 * However, given that at present the function is void, this
347 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
353 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
360 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
361 rc = obd_pin(sbi->ll_mdc_exp, inode->i_ino, inode->i_generation,
362 inode->i_mode & S_IFMT, handle, flag);
366 memset(handle, 0, sizeof(*handle));
368 ldd->lld_cwd_count--;
370 ldd->lld_mnt_count--;
378 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
380 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
381 struct ll_dentry_data *ldd = ll_d2d(de);
382 struct obd_client_handle handle;
388 /* Strictly speaking this introduces an additional race: the
389 * increments should wait until the rpc has returned.
390 * However, given that at present the function is void, this
392 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
393 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
394 /* the "pin" failed */
401 count = --ldd->lld_mnt_count;
403 count = --ldd->lld_cwd_count;
411 rc = obd_unpin(sbi->ll_mdc_exp, &handle, flag);
416 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
417 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
422 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
423 rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
425 rc = ll_revalidate_it(dentry, 0, NULL);
431 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
432 static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
434 struct ll_sb_info *sbi = ll_i2sbi(inode);
435 struct ll_fid parent, child;
437 LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
438 ll_inode2fid(&parent, dentry->d_parent->d_inode);
439 ll_inode2fid(&child, inode);
440 md_change_cbdata_name(sbi->ll_mdc_exp, &parent,
441 (char *)dentry->d_name.name,
442 dentry->d_name.len, &child,
443 null_if_equal, inode);
447 #error "implement ->d_iput() for 2.6"
450 struct dentry_operations ll_d_ops = {
451 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
452 .d_revalidate = ll_revalidate_nd,
454 .d_revalidate_it = ll_revalidate_it,
456 .d_release = ll_release,
457 .d_iput = ll_dentry_iput,
458 .d_delete = ll_ddelete,