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/locks.h>
  24 #include <linux/quotaops.h>
  25
  26 #define DEBUG_SUBSYSTEM S_LLITE
  27
  28 #include <linux/obd_support.h>
  29 #include <linux/lustre_lite.h>
  30 #include <linux/lustre_dlm.h>
  31
  32 extern struct address_space_operations ll_aops;
  33
  34 void ll_release(struct dentry *de)
  35 {
  36         ENTRY;
  37
  38         OBD_FREE(de->d_fsdata, sizeof(struct ll_dentry_data));
  39         EXIT;
  40 }
  41
  42 void ll_intent_release(struct dentry *de)
  43 {
  44         struct lookup_intent *it;
  45         struct lustre_handle *handle;
  46         ENTRY;
  47
  48         it = de->d_it;
  49         if (it == NULL) {
  50                 EXIT;
  51                 return;
  52         }
  53
  54         LASSERT(ll_d2d(de) != NULL);
  55
  56         if (it->it_lock_mode) {
  57                 handle = (struct lustre_handle *)it->it_lock_handle;
  58                 if (it->it_op == IT_SETATTR) {
  59                         int rc;
  60                         ldlm_lock_decref(handle, it->it_lock_mode);
  61                         rc = ldlm_cli_cancel(handle);
  62                         if (rc < 0)
  63                                 CERROR("ldlm_cli_cancel: %d\n", rc);
  64                 } else
  65                         ldlm_lock_decref(handle, it->it_lock_mode);
  66         }
  67         de->d_it = NULL;
  68         //up(&ll_d2d(de)->lld_it_sem);
  69         EXIT;
  70 }
  71
  72 int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
  73 {
  74         struct ll_sb_info *sbi = ll_s2sbi(de->d_sb);
  75         struct lustre_handle lockh;
  76         __u64 res_id[RES_NAME_SIZE] = {0};
  77         struct obd_device *obddev;
  78         int rc = 0;
  79         ENTRY;
  80
  81         if (it) {
  82                 CDEBUG(D_INFO, "name: %*s, intent: %s\n", de->d_name.len,
  83                        de->d_name.name, ldlm_it2str(it->it_op));
  84                 if (it->it_op == IT_RENAME)
  85                         it->it_data = de;
  86         }
  87
  88         if (!de->d_inode)
  89                 GOTO(out, rc = 0);
  90
  91         obddev = class_conn2obd(&sbi->ll_mdc_conn);
  92         res_id[0] = de->d_inode->i_ino;
  93
  94         CDEBUG(D_INFO, "trying to match res "LPU64"\n", res_id[0]);
  95
  96         if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
  97                             NULL, 0, LCK_PR, &lockh)) {
  98                 ldlm_lock_decref(&lockh, LCK_PR);
  99                 GOTO(out, rc = 1);
 100         }
 101
 102         if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
 103                             NULL, 0, LCK_PW, &lockh)) {
 104                 ldlm_lock_decref(&lockh, LCK_PW);
 105                 GOTO(out, rc = 1);
 106         }
 107
 108         /* If the dentry is busy, we won't get called in lookup2 if we
 109          * return 0, so return 1.
 110          *
 111          * This is a temporary fix for bug 618962, but is one of the causes of
 112          * 619078. */
 113         CDEBUG(D_INFO, "d_count: %d\n", atomic_read(&de->d_count));
 114         if (it && atomic_read(&de->d_count) > 0) {
 115                 CERROR("returning 1 for %*s during %s because d_count is %d\n",
 116                        de->d_name.len, de->d_name.name, ldlm_it2str(it->it_op),
 117                        atomic_read(&de->d_count));
 118                 GOTO(out, rc = 1);
 119         }
 120
 121  out:
 122         if (ll_d2d(de) == NULL) {
 123                 CERROR("allocating fsdata\n");
 124                 ll_set_dd(de);
 125         }
 126         //down(&ll_d2d(de)->lld_it_sem);
 127         //  de->d_it = it;
 128
 129         RETURN(rc);
 130 }
 131
 132 int ll_set_dd(struct dentry *de)
 133 {
 134         ENTRY;
 135         LASSERT(de != NULL);
 136
 137         lock_kernel();
 138
 139         if (de->d_fsdata != NULL) {
 140                 CERROR("dentry %p already has d_fsdata set\n", de);
 141         } else {
 142                 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
 143                 sema_init(&ll_d2d(de)->lld_it_sem, 1);
 144         }
 145
 146         unlock_kernel();
 147
 148         RETURN(0);
 149 }
 150
 151 struct dentry_operations ll_d_ops = {
 152         .d_revalidate2 = ll_revalidate2,
 153         .d_intent_release = ll_intent_release,
 154         .d_release = ll_release,
 155 };