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 ? "deleting" : "keeping"),
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 int revalidate_it_finish(struct ptlrpc_request *request, int offset,
159 struct lookup_intent *it, struct dentry *de)
161 struct ll_sb_info *sbi;
168 if (it_disposition(it, DISP_LOOKUP_NEG))
171 sbi = ll_i2sbi(de->d_inode);
172 rc = ll_prep_inode(sbi->ll_osc_exp, sbi->ll_mdc_exp,
173 &de->d_inode, request, offset, NULL);
178 void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
181 LASSERT(dentry != NULL);
183 if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
184 struct inode *inode = dentry->d_inode;
185 CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
186 inode, inode->i_ino, inode->i_generation);
187 mdc_set_lock_data(NULL, &it->d.lustre.it_lock_handle, inode);
190 /* drop lookup or getattr locks immediately */
191 if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR || it->it_op == IT_CHDIR) {
192 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
193 /* on 2.6 there are situation when several lookups and
194 * revalidations may be requested during single operation.
195 * therefore, we don't release intent here -bzzz */
196 ll_intent_drop_lock(it);
198 ll_intent_release(it);
203 void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
205 struct lookup_intent *it = *itp;
206 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
208 LASSERTF(it->it_magic == INTENT_MAGIC, "bad intent magic: %x\n",
213 if (!it || it->it_op == IT_GETXATTR)
216 it->it_op_release = ll_intent_release;
219 int ll_revalidate_it(struct dentry *de, int flags, struct nameidata *nd,
220 struct lookup_intent *it)
223 struct ll_fid pfid, cfid;
224 struct it_cb_data icbd;
225 struct ptlrpc_request *req = NULL;
226 struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
227 struct obd_export *exp;
230 CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
233 /* Cached negative dentries are unsafe for now - look them up again */
234 if (de->d_inode == NULL)
237 CDEBUG(D_INODE, "revalidate 0x%p: %*s -> %lu/%lu\n",
238 de, de->d_name.len, de->d_name.name,
239 (unsigned long) de->d_inode->i_ino,
240 (unsigned long) de->d_inode->i_generation);
242 exp = ll_i2mdcexp(de->d_inode);
243 ll_inode2fid(&pfid, de->d_parent->d_inode);
244 ll_inode2fid(&cfid, de->d_inode);
245 icbd.icbd_parent = de->d_parent->d_inode;
246 icbd.icbd_childp = &de;
248 /* Never execute intents for mount points.
249 * Attributes will be fixed up in ll_inode_revalidate_it */
250 if (d_mountpoint(de))
254 nd->mnt->mnt_last_used = jiffies;
256 ll_frob_intent(&it, &lookup_it);
259 if (it->it_op == IT_GETATTR) { /* We need to check for LOOKUP lock
261 rc = md_intent_lock(exp, &pfid, de->d_name.name,
262 de->d_name.len, NULL, 0, &cfid, &lookup_it,
263 flags, &req, ll_mdc_blocking_ast);
264 /* If there was no lookup lock, no point in even checking for
270 if (it_disposition(&lookup_it, DISP_LOOKUP_NEG)) {
271 ll_intent_release(&lookup_it);
277 ptlrpc_req_finished(req);
279 ll_lookup_finish_locks(&lookup_it, de);
282 rc = md_intent_lock(exp, &pfid, de->d_name.name, de->d_name.len,
283 NULL, 0, &cfid, it, flags, &req,
284 ll_mdc_blocking_ast);
285 /* If req is NULL, then mdc_intent_lock only tried to do a lock match;
286 * if all was well, it will return 1 if it found locks, 0 otherwise. */
287 if (req == NULL && rc >= 0)
292 CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
293 "%d\n", rc, it->d.lustre.it_status);
298 rc = revalidate_it_finish(req, 1, it, de);
300 ll_intent_release(it);
305 /* unfortunately ll_intent_lock may cause a callback and revoke our
307 spin_lock(&dcache_lock);
308 hlist_del_init(&de->d_hash);
310 spin_unlock(&dcache_lock);
314 if (req != NULL && rc == 1)
315 ptlrpc_req_finished(req);
317 ll_unhash_aliases(de->d_inode);
321 CDEBUG(D_DENTRY, "revalidated dentry %*s (%p) parent %p "
322 "inode %p refc %d\n", de->d_name.len,
323 de->d_name.name, de, de->d_parent, de->d_inode,
324 atomic_read(&de->d_count));
325 ll_lookup_finish_locks(it, de);
326 de->d_flags &= ~DCACHE_LUSTRE_INVALID;
327 if (!((de->d_inode->i_mode & S_ISUID) &&S_ISDIR(de->d_inode->i_mode)) ||
328 !(flags & LOOKUP_CONTINUE || (it->it_op & (IT_CHDIR | IT_OPEN))))
332 (void)ll_dir_process_mount_object(de, nd->mnt);
336 /*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
338 struct inode *inode= de->d_inode;
339 struct ll_sb_info *sbi = ll_i2sbi(inode);
340 struct ll_dentry_data *ldd = ll_d2d(de);
341 struct obd_client_handle *handle;
347 /* Strictly speaking this introduces an additional race: the
348 * increments should wait until the rpc has returned.
349 * However, given that at present the function is void, this
351 if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
357 if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
364 handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
365 rc = obd_pin(sbi->ll_mdc_exp, inode->i_ino, inode->i_generation,
366 inode->i_mode & S_IFMT, handle, flag);
370 memset(handle, 0, sizeof(*handle));
372 ldd->lld_cwd_count--;
374 ldd->lld_mnt_count--;
382 /*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
384 struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
385 struct ll_dentry_data *ldd = ll_d2d(de);
386 struct obd_client_handle handle;
392 /* Strictly speaking this introduces an additional race: the
393 * increments should wait until the rpc has returned.
394 * However, given that at present the function is void, this
396 handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
397 if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
398 /* the "pin" failed */
405 count = --ldd->lld_mnt_count;
407 count = --ldd->lld_cwd_count;
415 rc = obd_unpin(sbi->ll_mdc_exp, &handle, flag);
420 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
421 static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
426 if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
427 rc = ll_revalidate_it(dentry, nd->flags, nd, &nd->intent);
429 rc = ll_revalidate_it(dentry, 0, nd, NULL);
435 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
436 static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
438 struct ll_sb_info *sbi = ll_i2sbi(inode);
439 struct ll_fid parent, child;
441 LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
442 ll_inode2fid(&parent, dentry->d_parent->d_inode);
443 ll_inode2fid(&child, inode);
444 md_change_cbdata_name(sbi->ll_mdc_exp, &parent,
445 (char *)dentry->d_name.name,
446 dentry->d_name.len, &child,
447 null_if_equal, inode);
451 static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
453 struct ll_sb_info *sbi = ll_i2sbi(inode);
454 struct ll_fid parent, child;
456 LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
457 ll_inode2fid(&parent, dentry->d_parent->d_inode);
458 ll_inode2fid(&child, inode);
459 md_change_cbdata_name(sbi->ll_mdc_exp, &parent,
460 (char *)dentry->d_name.name,
461 dentry->d_name.len, &child,
462 null_if_equal, inode);
467 struct dentry_operations ll_d_ops = {
468 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
469 .d_revalidate = ll_revalidate_nd,
471 .d_revalidate_it = ll_revalidate_it,
473 .d_release = ll_release,
474 .d_iput = ll_dentry_iput,
475 .d_delete = ll_ddelete,