X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fllite%2Fdcache.c;h=dcf56ef38dd2c618123af3ce32f41165b28be06b;hb=2dc9c16e770415d56839e1996015fec5fab93f29;hp=5d1c29dff2b16f031fecd5ac9b2b6596941f38a7;hpb=616e61d0c24f2316b2cc832818d3410a68a2eb24;p=fs%2Flustre-release.git

diff --git a/lustre/llite/dcache.c b/lustre/llite/dcache.c
index 5d1c29d..dcf56ef 100644
--- a/lustre/llite/dcache.c
+++ b/lustre/llite/dcache.c
@@ -1,50 +1,463 @@
 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
  * vim:expandtab:shiftwidth=8:tabstop=8:
  *
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
+ *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
  *
- * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
+ *   This file is part of Lustre, http://www.lustre.org.
  *
+ *   Lustre is free software; you can redistribute it and/or
+ *   modify it under the terms of version 2 of the GNU General Public
+ *   License as published by the Free Software Foundation.
+ *
+ *   Lustre is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Lustre; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <linux/fs.h>
-#include <linux/locks.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
 #include <linux/quotaops.h>
 
 #define DEBUG_SUBSYSTEM S_LLITE
 
 #include <linux/obd_support.h>
 #include <linux/lustre_lite.h>
+#include <linux/lustre_idl.h>
+#include <linux/lustre_dlm.h>
+#include <linux/lustre_version.h>
+
+#include "llite_internal.h"
+
+/* should NOT be called with the dcache lock, see fs/dcache.c */
+static void ll_release(struct dentry *de)
+{
+        struct ll_dentry_data *lld;
+        ENTRY;
+        LASSERT(de != NULL);
+        lld = ll_d2d(de);
+        LASSERT(lld != NULL);
+        LASSERT(lld->lld_cwd_count == 0);
+        LASSERT(lld->lld_mnt_count == 0);
+        OBD_FREE(de->d_fsdata, sizeof(struct ll_dentry_data));
 
-extern struct address_space_operations ll_aops;
+        EXIT;
+}
 
-void ll_intent_release(struct dentry *de)
+/* should NOT be called with the dcache lock, see fs/dcache.c */
+static int ll_ddelete(struct dentry *de)
+{
+        ENTRY;
+        LASSERT(de);
+        CDEBUG(D_DENTRY, "%s dentry %*s (%p, parent %p, inode %p) %s%s\n",
+               (de->d_flags & DCACHE_LUSTRE_INVALID ? "keeping" : "deleting"),
+               de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
+               d_unhashed(de) ? "" : "hashed,",
+               list_empty(&de->d_subdirs) ? "" : "subdirs");
+        RETURN(0);
+}
+
+void ll_set_dd(struct dentry *de)
+{
+        ENTRY;
+        LASSERT(de != NULL);
+
+        CDEBUG(D_DENTRY, "ldd on dentry %*s (%p) parent %p inode %p refc %d\n",
+               de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
+               atomic_read(&de->d_count));
+        lock_kernel();
+        if (de->d_fsdata == NULL) {
+                OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
+        }
+        unlock_kernel();
+
+        EXIT;
+}
+
+void ll_intent_drop_lock(struct lookup_intent *it)
 {
         struct lustre_handle *handle;
+
+        if (it->it_op && it->d.lustre.it_lock_mode) {
+                handle = (struct lustre_handle *)&it->d.lustre.it_lock_handle;
+                CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
+                       " from it %p\n", handle->cookie, it);
+                ldlm_lock_decref(handle, it->d.lustre.it_lock_mode);
+
+                /* bug 494: intent_release may be called multiple times, from
+                 * this thread and we don't want to double-decref this lock */
+                it->d.lustre.it_lock_mode = 0;
+        }
+}
+
+void ll_intent_release(struct lookup_intent *it)
+{
+        ENTRY;
+
+        ll_intent_drop_lock(it);
+        it->it_magic = 0;
+        it->it_op_release = 0;
+        it->d.lustre.it_disposition = 0;
+        it->d.lustre.it_data = NULL;
+        EXIT;
+}
+
+void ll_unhash_aliases(struct inode *inode)
+{
+        struct list_head *tmp, *head;
+        struct ll_sb_info *sbi;
         ENTRY;
 
-        if (de->d_it == NULL) {
+        if (inode == NULL) {
+                CERROR("unexpected NULL inode, tell phil\n");
+                return;
+        }
+
+        CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
+               inode->i_ino, inode->i_generation, inode);
+
+        sbi = ll_i2sbi(inode);
+        head = &inode->i_dentry;
+restart:
+        spin_lock(&dcache_lock);
+        tmp = head;
+        while ((tmp = tmp->next) != head) {
+                struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
+                if (atomic_read(&dentry->d_count) == 0) {
+                        CDEBUG(D_DENTRY, "deleting dentry %*s (%p) parent %p "
+                               "inode %p\n", dentry->d_name.len,
+                               dentry->d_name.name, dentry, dentry->d_parent,
+                               dentry->d_inode);
+                        dget_locked(dentry);
+                        __d_drop(dentry);
+                        spin_unlock(&dcache_lock);
+                        dput(dentry);
+                        goto restart;
+                } else if (!(dentry->d_flags & DCACHE_LUSTRE_INVALID)) {
+                        CDEBUG(D_DENTRY, "unhashing dentry %*s (%p) parent %p "
+                               "inode %p refc %d\n", dentry->d_name.len,
+                               dentry->d_name.name, dentry, dentry->d_parent,
+                               dentry->d_inode, atomic_read(&dentry->d_count));
+                        hlist_del_init(&dentry->d_hash);
+                        dentry->d_flags |= DCACHE_LUSTRE_INVALID;
+                        hlist_add_head(&dentry->d_hash,
+                                       &sbi->ll_orphan_dentry_list);
+                }
+        }
+        spin_unlock(&dcache_lock);
+        EXIT;
+}
+
+extern struct dentry *ll_find_alias(struct inode *, struct dentry *);
+
+static int revalidate_it_finish(struct ptlrpc_request *request, 
+                                int offset, struct lookup_intent *it,
+                                struct dentry *de)
+{
+        struct ll_sb_info *sbi;
+        int rc = 0;
+        ENTRY;
+
+        if (!request)
+                RETURN(0);
+
+        if (it_disposition(it, DISP_LOOKUP_NEG))
+                RETURN(-ENOENT);
+
+        sbi = ll_i2sbi(de->d_inode);
+        rc = ll_prep_inode(sbi->ll_osc_exp, sbi->ll_mdc_exp,
+                           &de->d_inode, request, offset, NULL);
+
+        RETURN(rc);
+}
+
+void ll_lookup_finish_locks(struct lookup_intent *it, struct dentry *dentry)
+{
+        LASSERT(it != NULL);
+        LASSERT(dentry != NULL);
+
+        if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
+                struct inode *inode = dentry->d_inode;
+                CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
+                       inode, inode->i_ino, inode->i_generation);
+                mdc_set_lock_data(NULL, &it->d.lustre.it_lock_handle, inode);
+        }
+
+        /* drop lookup or getattr locks immediately */
+        if (it->it_op == IT_LOOKUP || it->it_op == IT_GETATTR) {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+                /* on 2.6 there are situation when several lookups and
+                 * revalidations may be requested during single operation.
+                 * therefore, we don't release intent here -bzzz */
+                ll_intent_drop_lock(it);
+#else
+                ll_intent_release(it);
+#endif
+        }
+}
+
+void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
+{
+        struct lookup_intent *it = *itp;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+        if (it && it->it_magic != INTENT_MAGIC) {
+                CERROR("WARNING: uninitialized intent\n");
+                LBUG();
+        }
+        if (it && (it->it_op == IT_GETATTR || it->it_op == 0))
+                it->it_op = IT_LOOKUP;
+#endif
+
+        if (!it || it->it_op == IT_GETXATTR)
+                it = *itp = deft;
+
+        it->it_op_release = ll_intent_release;
+}
+
+int ll_revalidate_it(struct dentry *de, int flags, struct lookup_intent *it)
+{
+        int rc;
+        struct ll_fid pfid, cfid;
+        struct it_cb_data icbd;
+        struct ll_uctxt ctxt;
+        struct ptlrpc_request *req = NULL;
+        struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
+        struct obd_export *exp;
+
+        ENTRY;
+        CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
+               LL_IT2STR(it));
+
+        /* Cached negative dentries are unsafe for now - look them up again */
+        if (de->d_inode == NULL)
+                RETURN(0);
+
+        CDEBUG(D_INODE, "revalidate 0x%p: %*s -> %lu/%lu\n",
+                        de, de->d_name.len, de->d_name.name,
+                        (unsigned long) de->d_inode->i_ino,
+                        (unsigned long) de->d_inode->i_generation);
+
+        exp = ll_i2mdcexp(de->d_inode);
+        ll_inode2fid(&pfid, de->d_parent->d_inode);
+        ll_inode2fid(&cfid, de->d_inode);
+        icbd.icbd_parent = de->d_parent->d_inode;
+        icbd.icbd_childp = &de;
+
+        /* Never execute intents for mount points.
+         * Attributes will be fixed up in ll_inode_revalidate_it */
+        if (d_mountpoint(de))
+                RETURN(1);
+
+        ll_frob_intent(&it, &lookup_it);
+        LASSERT(it);
+
+        ll_i2uctxt(&ctxt, de->d_parent->d_inode, de->d_inode);
+
+        if (it->it_op == IT_GETATTR) { /* We need to check for LOOKUP lock
+                                          as well */
+                rc = md_intent_lock(exp, &ctxt, &pfid, de->d_name.name,
+                                    de->d_name.len, NULL, 0, &cfid, &lookup_it,
+                                    flags, &req, ll_mdc_blocking_ast);
+                /* If there was no lookup lock, no point in even checking for
+                   UPDATE lock */
+                if (!rc) {
+                        it = &lookup_it;
+                        GOTO(out, rc);
+                }
+                if (it_disposition(&lookup_it, DISP_LOOKUP_NEG)) {
+                        ll_intent_release(&lookup_it);
+                        it = &lookup_it;
+                        GOTO(out, rc = 0);
+                }
+
+                if (req)
+                        ptlrpc_req_finished(req);
+                req = NULL;
+                ll_lookup_finish_locks(&lookup_it, de);
+        }
+
+        rc = md_intent_lock(exp, &ctxt, &pfid, de->d_name.name, de->d_name.len,
+                            NULL, 0, &cfid, it, flags, &req,
+                            ll_mdc_blocking_ast);
+        /* If req is NULL, then mdc_intent_lock only tried to do a lock match;
+         * if all was well, it will return 1 if it found locks, 0 otherwise. */
+        if (req == NULL && rc >= 0)
+                GOTO(out, rc);
+
+        if (rc < 0) {
+                if (rc != -ESTALE) {
+                        CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
+                               "%d\n", rc, it->d.lustre.it_status);
+                }
+                GOTO(out, rc = 0);
+        }
+
+        rc = revalidate_it_finish(req, 1, it, de);
+        if (rc != 0) {
+                ll_intent_release(it);
+                GOTO(out, rc = 0);
+        }
+        rc = 1;
+
+        /* unfortunately ll_intent_lock may cause a callback and revoke our
+           dentry */
+        spin_lock(&dcache_lock);
+        hlist_del_init(&de->d_hash);
+        __d_rehash(de, 0);
+        spin_unlock(&dcache_lock);
+
+ out:
+        if (req != NULL && rc == 1)
+                ptlrpc_req_finished(req);
+        if (rc == 0) {
+                ll_unhash_aliases(de->d_inode);
+                /* done in ll_unhash_aliases()
+                de->d_flags |= DCACHE_LUSTRE_INVALID; */
+        } else {
+                CDEBUG(D_DENTRY, "revalidated dentry %*s (%p) parent %p "
+                               "inode %p refc %d\n", de->d_name.len,
+                               de->d_name.name, de, de->d_parent, de->d_inode,
+                               atomic_read(&de->d_count));
+                ll_lookup_finish_locks(it, de);
+                de->d_flags &= ~DCACHE_LUSTRE_INVALID;
+        }
+        RETURN(rc);
+}
+
+/*static*/ void ll_pin(struct dentry *de, struct vfsmount *mnt, int flag)
+{
+        struct inode *inode= de->d_inode;
+        struct ll_sb_info *sbi = ll_i2sbi(inode);
+        struct ll_dentry_data *ldd = ll_d2d(de);
+        struct obd_client_handle *handle;
+        int rc = 0;
+        ENTRY;
+        LASSERT(ldd);
+
+        lock_kernel();
+        /* Strictly speaking this introduces an additional race: the
+         * increments should wait until the rpc has returned.
+         * However, given that at present the function is void, this
+         * issue is moot. */
+        if (flag == 1 && (++ldd->lld_mnt_count) > 1) {
+                unlock_kernel();
                 EXIT;
                 return;
         }
 
-        if (de->d_it->it_lock_mode) {
-                handle = (struct lustre_handle *)de->d_it->it_lock_handle;
-                ldlm_lock_decref(handle, de->d_it->it_lock_mode);
+        if (flag == 0 && (++ldd->lld_cwd_count) > 1) {
+                unlock_kernel();
+                EXIT;
+                return;
         }
-        de->d_it = NULL;
+        unlock_kernel();
+
+        handle = (flag) ? &ldd->lld_mnt_och : &ldd->lld_cwd_och;
+        rc = obd_pin(sbi->ll_mdc_exp, inode->i_ino, inode->i_generation,
+                     inode->i_mode & S_IFMT, handle, flag);
+
+        if (rc) {
+                lock_kernel();
+                memset(handle, 0, sizeof(*handle));
+                if (flag == 0)
+                        ldd->lld_cwd_count--;
+                else
+                        ldd->lld_mnt_count--;
+                unlock_kernel();
+        }
+
         EXIT;
+        return;
 }
 
-int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
+/*static*/ void ll_unpin(struct dentry *de, struct vfsmount *mnt, int flag)
 {
+        struct ll_sb_info *sbi = ll_i2sbi(de->d_inode);
+        struct ll_dentry_data *ldd = ll_d2d(de);
+        struct obd_client_handle handle;
+        int count, rc = 0;
         ENTRY;
+        LASSERT(ldd);
 
-        RETURN(0);
+        lock_kernel();
+        /* Strictly speaking this introduces an additional race: the
+         * increments should wait until the rpc has returned.
+         * However, given that at present the function is void, this
+         * issue is moot. */
+        handle = (flag) ? ldd->lld_mnt_och : ldd->lld_cwd_och;
+        if (handle.och_magic != OBD_CLIENT_HANDLE_MAGIC) {
+                /* the "pin" failed */
+                unlock_kernel();
+                EXIT;
+                return;
+        }
+
+        if (flag)
+                count = --ldd->lld_mnt_count;
+        else
+                count = --ldd->lld_cwd_count;
+        unlock_kernel();
+
+        if (count != 0) {
+                EXIT;
+                return;
+        }
+
+        rc = obd_unpin(sbi->ll_mdc_exp, &handle, flag);
+        EXIT;
+        return;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+static int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
+{
+        int rc;
+        ENTRY;
+
+        if (nd && nd->flags & LOOKUP_LAST && !(nd->flags & LOOKUP_LINK_NOTLAST))
+                rc = ll_revalidate_it(dentry, nd->flags, &nd->intent);
+        else
+                rc = ll_revalidate_it(dentry, 0, NULL);
+
+        RETURN(rc);
+}
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+static void ll_dentry_iput(struct dentry *dentry, struct inode *inode)
+{
+        struct ll_sb_info *sbi = ll_i2sbi(inode);
+        struct ll_fid parent, child;
+
+        LASSERT(dentry->d_parent && dentry->d_parent->d_inode);
+        ll_inode2fid(&parent, dentry->d_parent->d_inode);
+        ll_inode2fid(&child, inode);
+        md_change_cbdata_name(sbi->ll_mdc_exp, &parent,
+                              (char *)dentry->d_name.name, 
+                              dentry->d_name.len, &child, 
+                              null_if_equal, inode);
+        iput(inode);
 }
+#else
+#error "implement ->d_iput() for 2.6"
+#endif
 
 struct dentry_operations ll_d_ops = {
-        d_revalidate2: ll_revalidate2,
-        d_intent_release: ll_intent_release
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+        .d_revalidate = ll_revalidate_nd,
+#else
+        .d_revalidate_it = ll_revalidate_it,
+#endif
+        .d_release = ll_release,
+        .d_iput = ll_dentry_iput,
+        .d_delete = ll_ddelete,
+#if 0
+        .d_pin = ll_pin,
+        .d_unpin = ll_unpin,
+#endif
 };