lustre/mds/mds_unlink_open.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/mds/mds_orphan.c
   5  *
   6  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   7  *   Author: Peter Braam <braam@clusterfs.com>
   8  *   Author: Andreas Dilger <adilger@clusterfs.com>
   9  *   Author: Phil Schwan <phil@clusterfs.com>
  10  *
  11  *   This file is part of Lustre, http://www.lustre.org.
  12  *
  13  *   Lustre is free software; you can redistribute it and/or
  14  *   modify it under the terms of version 2 of the GNU General Public
  15  *   License as published by the Free Software Foundation.
  16  *
  17  *   Lustre is distributed in the hope that it will be useful,
  18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *   GNU General Public License for more details.
  21  *
  22  *   You should have received a copy of the GNU General Public License
  23  *   along with Lustre; if not, write to the Free Software
  24  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 /* code for handling open unlinked files */
  28
  29 #define DEBUG_SUBSYSTEM S_MDS
  30
  31 #include <linux/config.h>
  32 #include <linux/module.h>
  33 #include <linux/version.h>
  34
  35 #include <portals/list.h>
  36 #include <linux/obd_class.h>
  37 #include <linux/lustre_fsfilt.h>
  38 #include <linux/lustre_commit_confd.h>
  39 #include <linux/lvfs.h>
  40
  41 #include "mds_internal.h"
  42
  43 static int mds_osc_destroy_orphan(struct mds_obd *mds,
  44                                   struct inode *inode,
  45                                   struct lov_mds_md *lmm,
  46                                   int lmm_size,
  47                                   struct llog_cookie *logcookies,
  48                                   int log_unlink)
  49 {
  50         struct lov_stripe_md *lsm = NULL;
  51         struct obd_trans_info oti = { 0 };
  52         struct obdo *oa;
  53         int rc;
  54         ENTRY;
  55
  56         if (lmm_size == 0)
  57                 RETURN(0);
  58
  59         rc = obd_unpackmd(mds->mds_lov_exp, &lsm, lmm, lmm_size);
  60         if (rc < 0) {
  61                 CERROR("Error unpack md %p\n", lmm);
  62                 RETURN(rc);
  63         } else {
  64                 LASSERT(rc >= sizeof(*lsm));
  65                 rc = 0;
  66         }
  67
  68         oa = obdo_alloc();
  69         if (oa == NULL)
  70                 GOTO(out_free_memmd, rc = -ENOMEM);
  71         oa->o_id = lsm->lsm_object_id;
  72         oa->o_gr = FILTER_GROUP_FIRST_MDS + mds->mds_num;
  73         oa->o_mode = inode->i_mode & S_IFMT;
  74         oa->o_valid = OBD_MD_FLID | OBD_MD_FLTYPE | OBD_MD_FLGROUP;
  75
  76         if (log_unlink && logcookies) {
  77                 oa->o_valid |= OBD_MD_FLCOOKIE;
  78                 oti.oti_logcookies = logcookies;
  79         }
  80
  81         rc = obd_destroy(mds->mds_lov_exp, oa, lsm, &oti);
  82         obdo_free(oa);
  83         if (rc)
  84                 CDEBUG(D_INODE, "destroy orphan objid 0x"LPX64" on ost error "
  85                        "%d\n", lsm->lsm_object_id, rc);
  86 out_free_memmd:
  87         obd_free_memmd(mds->mds_lov_exp, &lsm);
  88         RETURN(rc);
  89 }
  90
  91 static int mds_unlink_orphan(struct obd_device *obd, struct dentry *dchild,
  92                              struct inode *inode, struct inode *pending_dir)
  93 {
  94         struct mds_obd *mds = &obd->u.mds;
  95         struct lov_mds_md *lmm = NULL;
  96         struct llog_cookie *logcookies = NULL;
  97         int lmm_size = 0, log_unlink = 0;
  98         void *handle = NULL;
  99         int rc, err;
 100         ENTRY;
 101
 102         LASSERT(mds->mds_lov_obd != NULL);
 103
 104         OBD_ALLOC(lmm, mds->mds_max_mdsize);
 105         if (lmm == NULL)
 106                 RETURN(-ENOMEM);
 107
 108         down(&inode->i_sem);
 109         rc = fsfilt_get_md(obd, inode, lmm, mds->mds_max_mdsize);
 110         up(&inode->i_sem);
 111
 112         if (rc < 0) {
 113                 CERROR("Error %d reading eadata for ino %lu\n",
 114                        rc, inode->i_ino);
 115                 GOTO(out_free_lmm, rc);
 116         } else if (rc > 0) {
 117                 lmm_size = rc;
 118                 rc = mds_convert_lov_ea(obd, inode, lmm, lmm_size);
 119                 if (rc > 0)
 120                         lmm_size = rc;
 121                 rc = 0;
 122         }
 123
 124         handle = fsfilt_start_log(obd, pending_dir, FSFILT_OP_UNLINK, NULL,
 125                                   le32_to_cpu(lmm->lmm_stripe_count));
 126         if (IS_ERR(handle)) {
 127                 rc = PTR_ERR(handle);
 128                 CERROR("error fsfilt_start: %d\n", rc);
 129                 handle = NULL;
 130                 GOTO(out_free_lmm, rc);
 131         }
 132
 133         if (S_ISDIR(inode->i_mode))
 134                 rc = vfs_rmdir(pending_dir, dchild);
 135         else
 136                 rc = vfs_unlink(pending_dir, dchild);
 137
 138         if (rc)
 139                 CERROR("error %d unlinking orphan %*s from PENDING directory\n",
 140                        rc, dchild->d_name.len, dchild->d_name.name);
 141
 142         if (!rc && lmm_size) {
 143                 OBD_ALLOC(logcookies, mds->mds_max_cookiesize);
 144                 if (logcookies == NULL)
 145                         rc = -ENOMEM;
 146                 else if (mds_log_op_unlink(obd, inode, lmm,lmm_size,logcookies,
 147                                            mds->mds_max_cookiesize, NULL) > 0)
 148                         log_unlink = 1;
 149         }
 150         err = fsfilt_commit(obd, mds->mds_sb, pending_dir, handle, 0);
 151         if (err) {
 152                 CERROR("error committing orphan unlink: %d\n", err);
 153                 if (!rc)
 154                         rc = err;
 155         }
 156         if (!rc) {
 157                 rc = mds_osc_destroy_orphan(mds, inode, lmm, lmm_size,
 158                                             logcookies, log_unlink);
 159         }
 160
 161         if (logcookies != NULL)
 162                 OBD_FREE(logcookies, mds->mds_max_cookiesize);
 163 out_free_lmm:
 164         OBD_FREE(lmm, mds->mds_max_mdsize);
 165         RETURN(rc);
 166 }
 167
 168 int mds_cleanup_orphans(struct obd_device *obd)
 169 {
 170         struct mds_obd *mds = &obd->u.mds;
 171         struct lvfs_run_ctxt saved;
 172         struct file *file;
 173         struct dentry *dchild, *dentry;
 174         struct vfsmount *mnt;
 175         struct inode *child_inode, *pending_dir = mds->mds_pending_dir->d_inode;
 176         struct l_linux_dirent *dirent, *n;
 177         struct list_head dentry_list;
 178         char d_name[LL_ID_NAMELEN];
 179         __u64 i = 0;
 180         int rc = 0, item = 0, namlen;
 181         ENTRY;
 182
 183         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 184         dentry = dget(mds->mds_pending_dir);
 185         if (IS_ERR(dentry))
 186                 GOTO(err_pop, rc = PTR_ERR(dentry));
 187         mnt = mntget(mds->mds_vfsmnt);
 188         if (IS_ERR(mnt))
 189                 GOTO(err_mntget, rc = PTR_ERR(mnt));
 190
 191         file = dentry_open(mds->mds_pending_dir, mds->mds_vfsmnt,
 192                            O_RDONLY | O_LARGEFILE);
 193         if (IS_ERR(file))
 194                 GOTO(err_pop, rc = PTR_ERR(file));
 195
 196         INIT_LIST_HEAD(&dentry_list);
 197         rc = l_readdir(file, &dentry_list);
 198         filp_close(file, 0);
 199         if (rc < 0)
 200                 GOTO(err_out, rc);
 201
 202         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 203                 i ++;
 204                 list_del(&dirent->lld_list);
 205
 206                 namlen = strlen(dirent->lld_name);
 207                 LASSERT(sizeof(d_name) >= namlen + 1);
 208                 strcpy(d_name, dirent->lld_name);
 209                 OBD_FREE(dirent, sizeof(*dirent));
 210
 211                 CDEBUG(D_INODE, "entry "LPU64" of PENDING DIR: %s\n",
 212                        i, d_name);
 213
 214                 if (((namlen == 1) && !strcmp(d_name, ".")) ||
 215                     ((namlen == 2) && !strcmp(d_name, ".."))) {
 216                         continue;
 217                 }
 218
 219                 down(&pending_dir->i_sem);
 220                 dchild = lookup_one_len(d_name, mds->mds_pending_dir, namlen);
 221                 if (IS_ERR(dchild)) {
 222                         up(&pending_dir->i_sem);
 223                         GOTO(err_out, rc = PTR_ERR(dchild));
 224                 }
 225                 if (!dchild->d_inode) {
 226                         CERROR("orphan %s has been removed\n", d_name);
 227                         GOTO(next, rc = 0);
 228                 }
 229
 230                 child_inode = dchild->d_inode;
 231                 DOWN_READ_I_ALLOC_SEM(child_inode);
 232                 if (mds_inode_is_orphan(child_inode) &&
 233                     mds_orphan_open_count(child_inode)) {
 234                         UP_READ_I_ALLOC_SEM(child_inode);
 235                         CWARN("orphan %s re-opened during recovery\n", d_name);
 236                         GOTO(next, rc = 0);
 237                 }
 238                 UP_READ_I_ALLOC_SEM(child_inode);
 239                 rc = mds_unlink_orphan(obd, dchild, child_inode, pending_dir);
 240                 if (rc == 0) {
 241                         item ++;
 242                         CWARN("removed orphan %s from MDS and OST\n", d_name);
 243                 } else {
 244                         CDEBUG(D_INODE, "removed orphan %s from MDS/OST failed,"
 245                                " rc = %d\n", d_name, rc);
 246                         rc = 0;
 247                 }
 248 next:
 249                 l_dput(dchild);
 250                 up(&pending_dir->i_sem);
 251         }
 252 err_out:
 253         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 254                 list_del(&dirent->lld_list);
 255                 OBD_FREE(dirent, sizeof(*dirent));
 256         }
 257 err_pop:
 258         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 259         if (rc == 0)
 260                 rc = item;
 261         RETURN(rc);
 262
 263 err_mntget:
 264         l_dput(mds->mds_pending_dir);
 265         goto err_pop;
 266 }