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_intent_release(struct dentry *de)
  35 {
  36         struct lustre_handle *handle;
  37         ENTRY;
  38
  39         if (de->d_it == NULL) {
  40                 EXIT;
  41                 return;
  42         }
  43         if (de->d_it->it_lock_mode) {
  44                 handle = (struct lustre_handle *)de->d_it->it_lock_handle;
  45                 if (de->d_it->it_op == IT_SETATTR) {
  46                         int rc;
  47                         ldlm_lock_decref(handle, de->d_it->it_lock_mode);
  48                         rc = ldlm_cli_cancel(handle);
  49                         if (rc < 0)
  50                                 CERROR("ldlm_cli_cancel: %d\n", rc);
  51                 } else
  52                         ldlm_lock_decref(handle, de->d_it->it_lock_mode);
  53         }
  54         de->d_it = NULL;
  55         EXIT;
  56 }
  57
  58 int ll_revalidate2(struct dentry *de, int flags, struct lookup_intent *it)
  59 {
  60         struct ll_sb_info *sbi = ll_s2sbi(de->d_sb);
  61         struct lustre_handle lockh;
  62         __u64 res_id[RES_NAME_SIZE] = {0};
  63         struct obd_device *obddev;
  64         ENTRY;
  65
  66         /* right now we're only interested in IT_OPEN and IT_LOOKUP */
  67         if (it) {
  68                 CDEBUG(D_INFO, "name: %*s, intent: %s\n", de->d_name.len,
  69                        de->d_name.name, ldlm_it2str(it->it_op));
  70                 if (!(it->it_op & IT_OPEN))
  71                         RETURN(0);
  72         }
  73
  74         if (!de->d_inode)
  75                 RETURN(0);
  76
  77         obddev = class_conn2obd(&sbi->ll_mdc_conn);
  78         res_id[0] = de->d_inode->i_ino;
  79
  80         CDEBUG(D_INFO, "trying to match res "LPU64"\n", res_id[0]);
  81
  82         if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
  83                             NULL, 0, LCK_PR, &lockh)) {
  84                 ldlm_lock_decref(&lockh, LCK_PR);
  85                 RETURN(1);
  86         }
  87
  88         if (ldlm_lock_match(obddev->obd_namespace, res_id, LDLM_MDSINTENT,
  89                             NULL, 0, LCK_PW, &lockh)) {
  90                 ldlm_lock_decref(&lockh, LCK_PW);
  91                 RETURN(1);
  92         }
  93
  94         /* If we're acting on an IT_OPEN intent and the file is already open,
  95          * we won't get called in lookup2 if we return 0, so return 1.
  96          *
  97          * This is a temporary fix for bug 618962, but is one of the causes of
  98          * 619078. */
  99         CDEBUG(D_INFO, "d_count: %d\n", atomic_read(&de->d_count));
 100         if (atomic_read(&de->d_count) > 0)
 101                 RETURN(1);
 102
 103         RETURN(0);
 104 }
 105
 106 struct dentry_operations ll_d_ops = {
 107         d_revalidate2: ll_revalidate2,
 108         d_intent_release: ll_intent_release
 109 };