lustre/llite/dcache.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2001, 2002 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   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.
  11  *
  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.
  16  *
  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.
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/sched.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/quotaops.h>
  26
  27 #define DEBUG_SUBSYSTEM S_LLITE
  28
  29 #include <linux/obd_support.h>
  30 #include <linux/lustre_lite.h>
  31 #include <linux/lustre_dlm.h>
  32
  33 extern struct address_space_operations ll_aops;
  34
  35 void ll_release(struct dentry *de)
  36 {
  37         ENTRY;
  38
  39         OBD_FREE(de->d_fsdata, sizeof(struct ll_dentry_data));
  40         EXIT;
  41 }
  42
  43 void ll_intent_release(struct dentry *de, struct lookup_intent *it)
  44 {
  45         struct lustre_handle *handle;
  46         ENTRY;
  47
  48         if (it == NULL) {
  49                 EXIT;
  50                 return;
  51         }
  52
  53         LASSERT(ll_d2d(de) != NULL);
  54
  55         if (it->it_lock_mode) {
  56                 handle = (struct lustre_handle *)it->it_lock_handle;
  57                 if (it->it_op == IT_SETATTR) {
  58                         int rc;
  59                         ldlm_lock_decref(handle, it->it_lock_mode);
  60                         rc = ldlm_cli_cancel(handle);
  61                         if (rc < 0)
  62                                 CERROR("ldlm_cli_cancel: %d\n", rc);
  63                 } else
  64                         ldlm_lock_decref(handle, it->it_lock_mode);
  65         }
  66         //up(&ll_d2d(de)->lld_it_sem);
  67         EXIT;
  68 }
  69
  70 int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
  71 {
  72         struct ll_sb_info *sbi = ll_s2sbi(de->d_sb);
  73         struct lustre_handle lockh;
  74         __u64 res_id[RES_NAME_SIZE] = {0};
  75         struct obd_device *obddev;
  76         int rc = 0;
  77         ENTRY;
  78
  79         if (it) {
  80                 CDEBUG(D_INFO, "name: %*s, intent: %s\n", de->d_name.len,
  81                        de->d_name.name, ldlm_it2str(it->it_op));
  82                 if (it->it_op == IT_RENAME)
  83                         it->it_data = de;
  84         }
  85
  86         if (!de->d_inode)
  87                 GOTO(out, rc = 0);
  88
  89         obddev = class_conn2obd(&sbi->ll_mdc_conn);
  90         res_id[0] = de->d_inode->i_ino;
  91
  92         CDEBUG(D_INFO, "trying to match res "LPU64"\n", res_id[0]);
  93
  94         if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
  95                             NULL, 0, LCK_PR, &lockh)) {
  96                 ldlm_lock_decref(&lockh, LCK_PR);
  97                 GOTO(out, rc = 1);
  98         }
  99
 100         if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
 101                             NULL, 0, LCK_PW, &lockh)) {
 102                 ldlm_lock_decref(&lockh, LCK_PW);
 103                 GOTO(out, rc = 1);
 104         }
 105
 106         /* If the dentry is busy, we won't get called in lookup2 if we
 107          * return 0, so return 1.
 108          *
 109          * This is a temporary fix for bug 618962, but is one of the causes of
 110          * 619078. */
 111         CDEBUG(D_INFO, "d_count: %d\n", atomic_read(&de->d_count));
 112         if (it && atomic_read(&de->d_count) > 0) {
 113                 CDEBUG(D_INFO, "returning 1 for %*s during %s because d_count "
 114                        "is %d\n", de->d_name.len, de->d_name.name,
 115                        ldlm_it2str(it->it_op), atomic_read(&de->d_count));
 116                 GOTO(out, rc = 1);
 117         }
 118
 119  out:
 120         if (ll_d2d(de) == NULL) {
 121                 CERROR("allocating fsdata\n");
 122                 ll_set_dd(de);
 123         }
 124         //down(&ll_d2d(de)->lld_it_sem);
 125         de->d_it = it;
 126
 127         RETURN(rc);
 128 }
 129
 130 int ll_set_dd(struct dentry *de)
 131 {
 132         ENTRY;
 133         LASSERT(de != NULL);
 134
 135         lock_kernel();
 136
 137         if (de->d_fsdata != NULL) {
 138                 CERROR("dentry %p already has d_fsdata set\n", de);
 139         } else {
 140                 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
 141                 sema_init(&ll_d2d(de)->lld_it_sem, 1);
 142         }
 143
 144         unlock_kernel();
 145
 146         RETURN(0);
 147 }
 148
 149 struct dentry_operations ll_d_ops = {
 150         .d_revalidate2 = ll_revalidate2,
 151         .d_intent_release = ll_intent_release,
 152         .d_release = ll_release,
 153 };