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         LASSERT(obd->obd_recovering == 0);
 104
 105         /* We don't need to do any of these other things for orhpan dirs,
 106          * especially not mds_get_md (may get a default LOV EA, bug 4554) */
 107         if (S_ISDIR(inode->i_mode)) {
 108                 rc = vfs_rmdir(pending_dir, dchild);
 109                 if (rc)
 110                         CERROR("error %d unlinking dir %*s from PENDING\n",
 111                                rc, dchild->d_name.len, dchild->d_name.name);
 112                 RETURN(rc);
 113         }
 114
 115         lmm_size = mds->mds_max_mdsize;
 116         OBD_ALLOC(lmm, lmm_size);
 117         if (lmm == NULL)
 118                 RETURN(-ENOMEM);
 119
 120         rc = mds_get_md(obd, inode, lmm, &lmm_size, 1, 0);
 121         if (rc < 0)
 122                 GOTO(out_free_lmm, rc);
 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         rc = vfs_unlink(pending_dir, dchild);
 134         if (rc) {
 135                 CERROR("error %d unlinking orphan %.*s from PENDING\n",
 136                        rc, dchild->d_name.len, dchild->d_name.name);
 137         } else if (lmm_size) {
 138                 OBD_ALLOC(logcookies, mds->mds_max_cookiesize);
 139                 if (logcookies == NULL)
 140                         rc = -ENOMEM;
 141                 else if (mds_log_op_unlink(obd, inode, lmm,lmm_size,logcookies,
 142                                            mds->mds_max_cookiesize, NULL) > 0)
 143                         log_unlink = 1;
 144         }
 145         err = fsfilt_commit(obd, mds->mds_sb, pending_dir, handle, 0);
 146         if (err) {
 147                 CERROR("error committing orphan unlink: %d\n", err);
 148                 if (!rc)
 149                         rc = err;
 150         } else if (!rc) {
 151                 rc = mds_osc_destroy_orphan(mds, inode, lmm, lmm_size,
 152                                             logcookies, log_unlink);
 153         }
 154
 155         if (logcookies != NULL)
 156                 OBD_FREE(logcookies, mds->mds_max_cookiesize);
 157 out_free_lmm:
 158         OBD_FREE(lmm, mds->mds_max_mdsize);
 159         RETURN(rc);
 160 }
 161
 162 int mds_cleanup_orphans(struct obd_device *obd)
 163 {
 164         struct mds_obd *mds = &obd->u.mds;
 165         struct lvfs_run_ctxt saved;
 166         struct file *file;
 167         struct dentry *dchild, *dentry;
 168         struct vfsmount *mnt;
 169         struct inode *child_inode, *pending_dir = mds->mds_pending_dir->d_inode;
 170         struct l_linux_dirent *dirent, *n;
 171         struct list_head dentry_list;
 172         char d_name[LL_ID_NAMELEN];
 173         unsigned long inum;
 174         __u64 i = 0;
 175         int rc = 0, item = 0, namlen;
 176         ENTRY;
 177
 178         LASSERT(obd->obd_recovering == 0);
 179         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 180         dentry = dget(mds->mds_pending_dir);
 181         if (IS_ERR(dentry))
 182                 GOTO(err_pop, rc = PTR_ERR(dentry));
 183         mnt = mntget(mds->mds_vfsmnt);
 184         if (IS_ERR(mnt))
 185                 GOTO(err_mntget, rc = PTR_ERR(mnt));
 186
 187         file = dentry_open(mds->mds_pending_dir, mds->mds_vfsmnt,
 188                            O_RDONLY | O_LARGEFILE);
 189         if (IS_ERR(file))
 190                 GOTO(err_pop, rc = PTR_ERR(file));
 191
 192         INIT_LIST_HEAD(&dentry_list);
 193         rc = l_readdir(file, &dentry_list);
 194         filp_close(file, 0);
 195         if (rc < 0)
 196                 GOTO(err_out, rc);
 197
 198         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 199                 i++;
 200                 list_del(&dirent->lld_list);
 201
 202                 namlen = strlen(dirent->lld_name);
 203                 LASSERT(sizeof(d_name) >= namlen + 1);
 204                 strcpy(d_name, dirent->lld_name);
 205                 inum = dirent->lld_ino;
 206                 OBD_FREE(dirent, sizeof(*dirent));
 207
 208                 CDEBUG(D_INODE, "entry "LPU64" of PENDING DIR: %s\n",
 209                        i, d_name);
 210
 211                 if (((namlen == 1) && !strcmp(d_name, ".")) ||
 212                     ((namlen == 2) && !strcmp(d_name, "..")) || inum == 0)
 213                         continue;
 214
 215                 down(&pending_dir->i_sem);
 216                 dchild = lookup_one_len(d_name, mds->mds_pending_dir, namlen);
 217                 if (IS_ERR(dchild)) {
 218                         up(&pending_dir->i_sem);
 219                         GOTO(err_out, rc = PTR_ERR(dchild));
 220                 }
 221                 if (!dchild->d_inode) {
 222                         CERROR("orphan %s has been removed\n", d_name);
 223                         GOTO(next, rc = 0);
 224                 }
 225
 226                 if (is_bad_inode(dchild->d_inode)) {
 227                         CERROR("bad orphan inode found %lu/%u\n",
 228                                dchild->d_inode->i_ino,
 229                                dchild->d_inode->i_generation);
 230                         GOTO(next, rc = -ENOENT);
 231                 }
 232
 233                 child_inode = dchild->d_inode;
 234                 DOWN_READ_I_ALLOC_SEM(child_inode);
 235                 if (mds_inode_is_orphan(child_inode) &&
 236                     mds_orphan_open_count(child_inode)) {
 237                         UP_READ_I_ALLOC_SEM(child_inode);
 238                         CWARN("orphan %s re-opened during recovery\n", d_name);
 239                         GOTO(next, rc = 0);
 240                 }
 241                 UP_READ_I_ALLOC_SEM(child_inode);
 242                 rc = mds_unlink_orphan(obd, dchild, child_inode, pending_dir);
 243                 if (rc == 0) {
 244                         item ++;
 245                         CWARN("removed orphan %s from MDS and OST\n", d_name);
 246                 } else {
 247                         CDEBUG(D_INODE, "removed orphan %s from MDS/OST failed,"
 248                                " rc = %d\n", d_name, rc);
 249                         rc = 0;
 250                 }
 251 next:
 252                 l_dput(dchild);
 253                 up(&pending_dir->i_sem);
 254         }
 255 err_out:
 256         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 257                 list_del(&dirent->lld_list);
 258                 OBD_FREE(dirent, sizeof(*dirent));
 259         }
 260 err_pop:
 261         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 262         if (rc == 0)
 263                 rc = item;
 264         RETURN(rc);
 265
 266 err_mntget:
 267         l_dput(mds->mds_pending_dir);
 268         goto err_pop;
 269 }