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_osc_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_mode = inode->i_mode & S_IFMT;
  73         oa->o_valid = OBD_MD_FLID | OBD_MD_FLTYPE;
  74
  75         if (log_unlink && logcookies) {
  76                 oa->o_valid |= OBD_MD_FLCOOKIE;
  77                 oti.oti_logcookies = logcookies;
  78         }
  79
  80         rc = obd_destroy(mds->mds_osc_exp, oa, lsm, &oti);
  81         obdo_free(oa);
  82         if (rc)
  83                 CDEBUG(D_INODE, "destroy orphan objid 0x"LPX64" on ost error "
  84                        "%d\n", lsm->lsm_object_id, rc);
  85 out_free_memmd:
  86         obd_free_memmd(mds->mds_osc_exp, &lsm);
  87         RETURN(rc);
  88 }
  89
  90 static int mds_unlink_orphan(struct obd_device *obd, struct dentry *dchild,
  91                              struct inode *inode, struct inode *pending_dir)
  92 {
  93         struct mds_obd *mds = &obd->u.mds;
  94         struct lov_mds_md *lmm = NULL;
  95         struct llog_cookie *logcookies = NULL;
  96         int lmm_size, log_unlink = 0;
  97         void *handle = NULL;
  98         int rc, err;
  99         ENTRY;
 100
 101         LASSERT(mds->mds_osc_obd != NULL);
 102
 103         /* We don't need to do any of these other things for orhpan dirs,
 104          * especially not mds_get_md (may get a default LOV EA, bug 4554) */
 105         if (S_ISDIR(inode->i_mode)) {
 106                 rc = vfs_rmdir(pending_dir, dchild);
 107                 if (rc)
 108                         CERROR("error %d unlinking dir %*s from PENDING\n",
 109                                rc, dchild->d_name.len, dchild->d_name.name);
 110                 RETURN(rc);
 111         }
 112
 113         lmm_size = mds->mds_max_mdsize;
 114         OBD_ALLOC(lmm, lmm_size);
 115         if (lmm == NULL)
 116                 RETURN(-ENOMEM);
 117
 118         rc = mds_get_md(obd, inode, lmm, &lmm_size, 1);
 119         if (rc < 0)
 120                 GOTO(out_free_lmm, rc);
 121
 122         handle = fsfilt_start_log(obd, pending_dir, FSFILT_OP_UNLINK, NULL,
 123                                   le32_to_cpu(lmm->lmm_stripe_count));
 124         if (IS_ERR(handle)) {
 125                 rc = PTR_ERR(handle);
 126                 CERROR("error fsfilt_start: %d\n", rc);
 127                 handle = NULL;
 128                 GOTO(out_free_lmm, rc);
 129         }
 130
 131         rc = vfs_unlink(pending_dir, dchild);
 132         if (rc)
 133                 CERROR("error %d unlinking orphan %.*s from PENDING\n",
 134                        rc, dchild->d_name.len, dchild->d_name.name);
 135         else if (lmm_size) {
 136                 OBD_ALLOC(logcookies, mds->mds_max_cookiesize);
 137                 if (logcookies == NULL)
 138                         rc = -ENOMEM;
 139                 else if (mds_log_op_unlink(obd, inode, lmm,lmm_size,logcookies,
 140                                            mds->mds_max_cookiesize) > 0)
 141                         log_unlink = 1;
 142         }
 143
 144         err = fsfilt_commit(obd, 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 obd_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_FID_NAMELEN];
 172         unsigned long inum;
 173         int i = 0, rc = 0, item = 0, namlen;
 174         ENTRY;
 175
 176         push_ctxt(&saved, &obd->obd_ctxt, NULL);
 177         dentry = dget(mds->mds_pending_dir);
 178         if (IS_ERR(dentry))
 179                 GOTO(err_pop, rc = PTR_ERR(dentry));
 180         mnt = mntget(mds->mds_vfsmnt);
 181         if (IS_ERR(mnt))
 182                 GOTO(err_mntget, rc = PTR_ERR(mnt));
 183
 184         file = dentry_open(mds->mds_pending_dir, mds->mds_vfsmnt,
 185                            O_RDONLY | O_LARGEFILE);
 186         if (IS_ERR(file))
 187                 GOTO(err_pop, rc = PTR_ERR(file));
 188
 189         INIT_LIST_HEAD(&dentry_list);
 190         rc = l_readdir(file, &dentry_list);
 191         filp_close(file, 0);
 192         if (rc < 0)
 193                 GOTO(err_out, rc);
 194
 195         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 196                 i++;
 197                 list_del(&dirent->lld_list);
 198
 199                 namlen = strlen(dirent->lld_name);
 200                 LASSERT(sizeof(d_name) >= namlen + 1);
 201                 strcpy(d_name, dirent->lld_name);
 202                 inum = dirent->lld_ino;
 203                 OBD_FREE(dirent, sizeof(*dirent));
 204
 205                 CDEBUG(D_INODE, "entry %d of PENDING DIR: %s\n", i, d_name);
 206
 207                 if (((namlen == 1) && !strcmp(d_name, ".")) ||
 208                     ((namlen == 2) && !strcmp(d_name, "..")) || inum == 0)
 209                         continue;
 210
 211                 down(&pending_dir->i_sem);
 212                 dchild = lookup_one_len(d_name, mds->mds_pending_dir, namlen);
 213                 if (IS_ERR(dchild)) {
 214                         up(&pending_dir->i_sem);
 215                         GOTO(err_out, rc = PTR_ERR(dchild));
 216                 }
 217                 if (!dchild->d_inode) {
 218                         CERROR("orphan %s has been removed\n", d_name);
 219                         GOTO(next, rc = 0);
 220                 }
 221
 222                 child_inode = dchild->d_inode;
 223                 DOWN_READ_I_ALLOC_SEM(child_inode);
 224                 if (mds_inode_is_orphan(child_inode) &&
 225                     mds_orphan_open_count(child_inode)) {
 226                         UP_READ_I_ALLOC_SEM(child_inode);
 227                         CWARN("orphan %s re-opened during recovery\n", d_name);
 228                         GOTO(next, rc = 0);
 229                 }
 230                 UP_READ_I_ALLOC_SEM(child_inode);
 231
 232                 rc = mds_unlink_orphan(obd, dchild, child_inode, pending_dir);
 233                 if (rc == 0) {
 234                         item ++;
 235                         CWARN("removed orphan %s from MDS and OST\n", d_name);
 236                 } else {
 237                         CDEBUG(D_INODE, "removed orphan %s from MDS/OST failed,"
 238                                " rc = %d\n", d_name, rc);
 239                         rc = 0;
 240                 }
 241 next:
 242                 l_dput(dchild);
 243                 up(&pending_dir->i_sem);
 244         }
 245 err_out:
 246         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 247                 list_del(&dirent->lld_list);
 248                 OBD_FREE(dirent, sizeof(*dirent));
 249         }
 250 err_pop:
 251         pop_ctxt(&saved, &obd->obd_ctxt, NULL);
 252         if (rc == 0)
 253                 rc = item;
 254         RETURN(rc);
 255
 256 err_mntget:
 257         l_dput(mds->mds_pending_dir);
 258         goto err_pop;
 259 }