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 <libcfs/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_dt_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_dt_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_dt_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, log_unlink = 0;
  98         void *handle = NULL;
  99         int rc, err;
 100         ENTRY;
 101
 102         LASSERT(mds->mds_dt_obd != NULL);
 103
 104         /* We don't need to do any of these other things for orhpan dirs,
 105          * especially not mds_get_md (may get a default LOV EA, bug 4554) */
 106         if (S_ISDIR(inode->i_mode)) {
 107                 rc = vfs_rmdir(pending_dir, dchild);
 108                 if (rc)
 109                         CERROR("error %d unlinking dir %*s from PENDING\n",
 110                                rc, dchild->d_name.len, dchild->d_name.name);
 111                 RETURN(rc);
 112         }
 113
 114         lmm_size = mds->mds_max_mdsize;
 115         OBD_ALLOC(lmm, lmm_size);
 116         if (lmm == NULL)
 117                 RETURN(-ENOMEM);
 118
 119         rc = mds_get_md(obd, inode, lmm, &lmm_size, 1, 0);
 120         if (rc < 0)
 121                 GOTO(out_free_lmm, rc);
 122
 123         handle = fsfilt_start_log(obd, pending_dir, FSFILT_OP_UNLINK, NULL,
 124                                   le32_to_cpu(lmm->lmm_stripe_count));
 125         if (IS_ERR(handle)) {
 126                 rc = PTR_ERR(handle);
 127                 CERROR("error fsfilt_start: %d\n", rc);
 128                 handle = NULL;
 129                 GOTO(out_free_lmm, rc);
 130         }
 131
 132         rc = vfs_unlink(pending_dir, dchild);
 133         if (rc) {
 134                 CERROR("error %d unlinking orphan %.*s from PENDING\n",
 135                        rc, dchild->d_name.len, dchild->d_name.name);
 136         } else if (lmm_size) {
 137                 OBD_ALLOC(logcookies, mds->mds_max_cookiesize);
 138                 if (logcookies == NULL)
 139                         rc = -ENOMEM;
 140                 else if (mds_log_op_unlink(obd, inode, lmm,lmm_size,logcookies,
 141                                            mds->mds_max_cookiesize, NULL) > 0)
 142                         log_unlink = 1;
 143         }
 144         err = fsfilt_commit(obd, mds->mds_sb, pending_dir, handle, 0);
 145         if (err) {
 146                 CERROR("error committing orphan unlink: %d\n", err);
 147                 if (!rc)
 148                         rc = err;
 149         } else if (!rc) {
 150                 rc = mds_osc_destroy_orphan(mds, inode, lmm, lmm_size,
 151                                             logcookies, log_unlink);
 152         }
 153
 154         if (logcookies != NULL)
 155                 OBD_FREE(logcookies, mds->mds_max_cookiesize);
 156 out_free_lmm:
 157         OBD_FREE(lmm, mds->mds_max_mdsize);
 158         RETURN(rc);
 159 }
 160
 161 int mds_cleanup_orphans(struct obd_device *obd)
 162 {
 163         struct mds_obd *mds = &obd->u.mds;
 164         struct lvfs_run_ctxt saved;
 165         struct file *file;
 166         struct dentry *dchild, *dentry;
 167         struct vfsmount *mnt;
 168         struct inode *child_inode, *pending_dir = mds->mds_pending_dir->d_inode;
 169         struct l_linux_dirent *dirent, *n;
 170         struct list_head dentry_list;
 171         char d_name[LL_ID_NAMELEN];
 172         unsigned long inum;
 173         __u64 i = 0;
 174         int rc = 0, item = 0, namlen;
 175         ENTRY;
 176
 177         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 178         dentry = dget(mds->mds_pending_dir);
 179         if (IS_ERR(dentry))
 180                 GOTO(err_pop, rc = PTR_ERR(dentry));
 181         mnt = mntget(mds->mds_vfsmnt);
 182         if (IS_ERR(mnt))
 183                 GOTO(err_mntget, rc = PTR_ERR(mnt));
 184
 185         file = dentry_open(mds->mds_pending_dir, mds->mds_vfsmnt,
 186                            O_RDONLY | O_LARGEFILE);
 187         if (IS_ERR(file))
 188                 GOTO(err_pop, rc = PTR_ERR(file));
 189
 190         INIT_LIST_HEAD(&dentry_list);
 191         rc = l_readdir(file, &dentry_list);
 192         filp_close(file, 0);
 193         if (rc < 0)
 194                 GOTO(err_out, rc);
 195
 196         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 197                 i++;
 198                 list_del(&dirent->lld_list);
 199
 200                 namlen = strlen(dirent->lld_name);
 201                 LASSERT(sizeof(d_name) >= namlen + 1);
 202                 strcpy(d_name, dirent->lld_name);
 203                 inum = dirent->lld_ino;
 204                 OBD_FREE(dirent, sizeof(*dirent));
 205
 206                 CDEBUG(D_INODE, "entry "LPU64" of PENDING DIR: %s\n",
 207                        i, d_name);
 208
 209                 if (((namlen == 1) && !strcmp(d_name, ".")) ||
 210                     ((namlen == 2) && !strcmp(d_name, "..")) || inum == 0)
 211                         continue;
 212
 213                 down(&pending_dir->i_sem);
 214                 dchild = lookup_one_len(d_name, mds->mds_pending_dir, namlen);
 215                 if (IS_ERR(dchild)) {
 216                         up(&pending_dir->i_sem);
 217                         GOTO(err_out, rc = PTR_ERR(dchild));
 218                 }
 219                 if (!dchild->d_inode) {
 220                         CERROR("orphan %s has been removed\n", d_name);
 221                         GOTO(next, rc = 0);
 222                 }
 223
 224                 if (is_bad_inode(dchild->d_inode)) {
 225                         CERROR("bad orphan inode found %lu/%u\n",
 226                                dchild->d_inode->i_ino,
 227                                dchild->d_inode->i_generation);
 228                         GOTO(next, rc = -ENOENT);
 229                 }
 230
 231                 child_inode = dchild->d_inode;
 232                 DOWN_READ_I_ALLOC_SEM(child_inode);
 233                 if (mds_inode_is_orphan(child_inode) &&
 234                     mds_orphan_open_count(child_inode)) {
 235                         UP_READ_I_ALLOC_SEM(child_inode);
 236                         CWARN("orphan %s re-opened during recovery\n", d_name);
 237                         GOTO(next, rc = 0);
 238                 }
 239                 UP_READ_I_ALLOC_SEM(child_inode);
 240                 rc = mds_unlink_orphan(obd, dchild, child_inode, pending_dir);
 241                 if (rc == 0) {
 242                         item ++;
 243                         CWARN("removed orphan %s from MDS and OST\n", d_name);
 244                 } else {
 245                         CDEBUG(D_INODE, "removed orphan %s from MDS/OST failed,"
 246                                " rc = %d\n", d_name, rc);
 247                         rc = 0;
 248                 }
 249 next:
 250                 l_dput(dchild);
 251                 up(&pending_dir->i_sem);
 252         }
 253 err_out:
 254         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 255                 list_del(&dirent->lld_list);
 256                 OBD_FREE(dirent, sizeof(*dirent));
 257         }
 258 err_pop:
 259         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 260         if (rc == 0)
 261                 rc = item;
 262         RETURN(rc);
 263
 264 err_mntget:
 265         l_dput(mds->mds_pending_dir);
 266         goto err_pop;
 267 }