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 lustre_handle *handle;
  45         ENTRY;
  46
  47         if (de->d_it == NULL) {
  48                 EXIT;
  49                 return;
  50         }
  51
  52         LASSERT(ll_d2d(de) != NULL);
  53
  54         if (de->d_it->it_lock_mode) {
  55                 handle = (struct lustre_handle *)de->d_it->it_lock_handle;
  56                 if (de->d_it->it_op == IT_SETATTR) {
  57                         int rc;
  58                         ldlm_lock_decref(handle, de->d_it->it_lock_mode);
  59                         rc = ldlm_cli_cancel(handle);
  60                         if (rc < 0)
  61                                 CERROR("ldlm_cli_cancel: %d\n", rc);
  62                 } else
  63                         ldlm_lock_decref(handle, de->d_it->it_lock_mode);
  64         }
  65         // de->d_it = NULL;
  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         ENTRY;
  77
  78         /* right now we're only interested in IT_OPEN and IT_LOOKUP */
  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_OPEN))
  83                         RETURN(0);
  84         }
  85
  86         if (!de->d_inode)
  87                 RETURN(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                 RETURN(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                 RETURN(1);
 104         }
 105
 106         /* If we're acting on an IT_OPEN intent and the file is already open,
 107          * we won't get called in lookup2 if we 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 (atomic_read(&de->d_count) > 0)
 113                 RETURN(1);
 114
 115         if (ll_d2d(de) == NULL) {
 116                 CERROR("allocating fsdata\n");
 117                 ll_set_dd(de);
 118         }
 119         down(&ll_d2d(de)->lld_it_sem);
 120         //  de->d_it = it;
 121
 122         RETURN(0);
 123 }
 124
 125 int ll_set_dd(struct dentry *de)
 126 {
 127         ENTRY;
 128         LASSERT(de != NULL);
 129
 130         lock_kernel();
 131
 132         if (de->d_fsdata != NULL) {
 133                 CERROR("dentry %p already has d_fsdata set\n", de);
 134         } else {
 135                 OBD_ALLOC(de->d_fsdata, sizeof(struct ll_dentry_data));
 136                 sema_init(&ll_d2d(de)->lld_it_sem, 1);
 137         }
 138
 139         unlock_kernel();
 140
 141         RETURN(0);
 142 }
 143
 144 struct dentry_operations ll_d_ops = {
 145         .d_revalidate2 = ll_revalidate2,
 146         .d_intent_release = ll_intent_release,
 147         .d_release = ll_release,
 148 };