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 the Lustre file system, http://www.lustre.org
  12  *   Lustre is a trademark of Cluster File Systems, Inc.
  13  *
  14  *   You may have signed or agreed to another license before downloading
  15  *   this software.  If so, you are bound by the terms and conditions
  16  *   of that agreement, and the following does not apply to you.  See the
  17  *   LICENSE file included with this distribution for more information.
  18  *
  19  *   If you did not agree to a different license, then this copy of Lustre
  20  *   is open source software; you can redistribute it and/or modify it
  21  *   under the terms of version 2 of the GNU General Public License as
  22  *   published by the Free Software Foundation.
  23  *
  24  *   In either case, Lustre is distributed in the hope that it will be
  25  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  26  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *   license text for more details.
  28  */
  29
  30 /* code for handling open unlinked files */
  31
  32 #define DEBUG_SUBSYSTEM S_MDS
  33
  34 #ifndef AUTOCONF_INCLUDED
  35 #include <linux/config.h>
  36 #endif
  37 #include <linux/module.h>
  38 #include <linux/version.h>
  39
  40 #include <libcfs/list.h>
  41 #include <obd_class.h>
  42 #include <lustre_fsfilt.h>
  43 #include <lustre_mds.h>
  44 #include <lustre_commit_confd.h>
  45 #include <lvfs.h>
  46
  47 #include "mds_internal.h"
  48
  49 int mds_osc_destroy_orphan(struct obd_device *obd,
  50                                   umode_t mode,
  51                                   struct lov_mds_md *lmm,
  52                                   int lmm_size,
  53                                   struct llog_cookie *logcookies,
  54                                   int log_unlink)
  55 {
  56         struct mds_obd *mds = &obd->u.mds;
  57         struct lov_stripe_md *lsm = NULL;
  58         struct obd_trans_info oti = { 0 };
  59         struct obdo *oa;
  60         int rc;
  61         ENTRY;
  62
  63         if (lmm_size == 0)
  64                 RETURN(0);
  65
  66         rc = obd_unpackmd(mds->mds_osc_exp, &lsm, lmm, lmm_size);
  67         if (rc < 0) {
  68                 CERROR("Error unpack md %p\n", lmm);
  69                 RETURN(rc);
  70         } else {
  71                 LASSERT(rc >= sizeof(*lsm));
  72                 rc = 0;
  73         }
  74
  75         rc = obd_checkmd(mds->mds_osc_exp, obd->obd_self_export, lsm);
  76         if (rc)
  77                 GOTO(out_free_memmd, rc);
  78
  79         OBDO_ALLOC(oa);
  80         if (oa == NULL)
  81                 GOTO(out_free_memmd, rc = -ENOMEM);
  82         oa->o_id = lsm->lsm_object_id;
  83         oa->o_gr = lsm->lsm_object_gr;
  84         oa->o_mode = mode & S_IFMT;
  85         oa->o_valid = OBD_MD_FLID | OBD_MD_FLTYPE | OBD_MD_FLGROUP;
  86
  87         if (log_unlink && logcookies) {
  88                 oa->o_valid |= OBD_MD_FLCOOKIE;
  89                 oti.oti_logcookies = logcookies;
  90         }
  91         rc = obd_destroy(mds->mds_osc_exp, oa, lsm, &oti, obd->obd_self_export);
  92         OBDO_FREE(oa);
  93         if (rc)
  94                 CDEBUG(D_INODE, "destroy orphan objid 0x"LPX64" on ost error "
  95                        "%d\n", lsm->lsm_object_id, rc);
  96 out_free_memmd:
  97         obd_free_memmd(mds->mds_osc_exp, &lsm);
  98         RETURN(rc);
  99 }
 100
 101 static int mds_unlink_orphan(struct obd_device *obd, struct dentry *dchild,
 102                              struct inode *inode, struct inode *pending_dir)
 103 {
 104         struct mds_obd *mds = &obd->u.mds;
 105         struct lov_mds_md *lmm = NULL;
 106         struct llog_cookie *logcookies = NULL;
 107         int lmm_size, log_unlink = 0, cookie_size = 0;
 108         void *handle = NULL;
 109         umode_t mode;
 110         int rc, err;
 111         ENTRY;
 112
 113         LASSERT(mds->mds_osc_obd != NULL);
 114
 115         /* We don't need to do any of these other things for orhpan dirs,
 116          * especially not mds_get_md (may get a default LOV EA, bug 4554) */
 117         mode = inode->i_mode;
 118         if (S_ISDIR(mode)) {
 119                 rc = vfs_rmdir(pending_dir, dchild);
 120                 if (rc)
 121                         CERROR("error %d unlinking dir %*s from PENDING\n",
 122                                rc, dchild->d_name.len, dchild->d_name.name);
 123                 RETURN(rc);
 124         }
 125
 126         lmm_size = mds->mds_max_mdsize;
 127         OBD_ALLOC(lmm, lmm_size);
 128         if (lmm == NULL)
 129                 RETURN(-ENOMEM);
 130
 131         rc = mds_get_md(obd, inode, lmm, &lmm_size, 1);
 132         if (rc < 0)
 133                 GOTO(out_free_lmm, rc);
 134
 135         handle = fsfilt_start_log(obd, pending_dir, FSFILT_OP_UNLINK, NULL,
 136                                   le32_to_cpu(lmm->lmm_stripe_count));
 137         if (IS_ERR(handle)) {
 138                 rc = PTR_ERR(handle);
 139                 CERROR("error fsfilt_start: %d\n", rc);
 140                 handle = NULL;
 141                 GOTO(out_free_lmm, rc);
 142         }
 143
 144         rc = vfs_unlink(pending_dir, dchild);
 145         if (rc) {
 146                 CERROR("error %d unlinking orphan %.*s from PENDING\n",
 147                        rc, dchild->d_name.len, dchild->d_name.name);
 148         } else if (lmm_size) {
 149                 cookie_size = mds_get_cookie_size(obd, lmm);
 150                 OBD_ALLOC(logcookies, cookie_size);
 151                 if (logcookies == NULL)
 152                         rc = -ENOMEM;
 153                 else if (mds_log_op_unlink(obd, lmm,lmm_size,logcookies,
 154                                            cookie_size) > 0)
 155                         log_unlink = 1;
 156         }
 157
 158         err = fsfilt_commit(obd, pending_dir, handle, 0);
 159         if (err) {
 160                 CERROR("error committing orphan unlink: %d\n", err);
 161                 if (!rc)
 162                         rc = err;
 163         } else if (!rc) {
 164                 rc = mds_osc_destroy_orphan(obd, mode, lmm, lmm_size,
 165                                             logcookies, log_unlink);
 166         }
 167
 168         if (logcookies != NULL)
 169                 OBD_FREE(logcookies, cookie_size);
 170 out_free_lmm:
 171         OBD_FREE(lmm, mds->mds_max_mdsize);
 172         RETURN(rc);
 173 }
 174
 175 /* Delete inodes which were previously open-unlinked but were not reopened
 176  * during MDS recovery for whatever reason (e.g. client also failed, recovery
 177  * aborted, etc). */
 178 int mds_cleanup_pending(struct obd_device *obd)
 179 {
 180         struct mds_obd *mds = &obd->u.mds;
 181         struct lvfs_run_ctxt saved;
 182         struct file *file;
 183         struct dentry *dchild, *dentry;
 184         struct vfsmount *mnt;
 185         struct inode *child_inode, *pending_dir = mds->mds_pending_dir->d_inode;
 186         struct l_linux_dirent *dirent, *n;
 187         struct list_head dentry_list;
 188         char d_name[LL_FID_NAMELEN];
 189         unsigned long inum;
 190         int i = 0, rc = 0, item = 0, namlen;
 191         ENTRY;
 192
 193         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 194         /* dentry and mnt ref dropped in dentry_open() on error, or
 195          * in filp_close() if dentry_open() succeeds */
 196         dentry = dget(mds->mds_pending_dir);
 197         if (IS_ERR(dentry))
 198                 GOTO(err_pop, rc = PTR_ERR(dentry));
 199         mnt = mntget(mds->mds_vfsmnt);
 200         if (IS_ERR(mnt))
 201                 GOTO(err_mntget, rc = PTR_ERR(mnt));
 202
 203         file = dentry_open(mds->mds_pending_dir, mds->mds_vfsmnt,
 204                            O_RDONLY | O_LARGEFILE);
 205         if (IS_ERR(file))
 206                 GOTO(err_pop, rc = PTR_ERR(file));
 207
 208         CFS_INIT_LIST_HEAD(&dentry_list);
 209         rc = l_readdir(file, &dentry_list);
 210         filp_close(file, 0);
 211         if (rc < 0)
 212                 GOTO(err_out, rc);
 213
 214         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 215                 i++;
 216                 list_del(&dirent->lld_list);
 217
 218                 namlen = strlen(dirent->lld_name);
 219                 LASSERT(sizeof(d_name) >= namlen + 1);
 220                 strcpy(d_name, dirent->lld_name);
 221                 inum = dirent->lld_ino;
 222                 OBD_FREE(dirent, sizeof(*dirent));
 223
 224                 CDEBUG(D_INODE, "entry %d of PENDING DIR: %s\n", i, d_name);
 225
 226                 if (((namlen == 1) && !strcmp(d_name, ".")) ||
 227                     ((namlen == 2) && !strcmp(d_name, "..")) || inum == 0)
 228                         continue;
 229
 230                 LOCK_INODE_MUTEX(pending_dir);
 231                 dchild = lookup_one_len(d_name, mds->mds_pending_dir, namlen);
 232                 if (IS_ERR(dchild)) {
 233                         UNLOCK_INODE_MUTEX(pending_dir);
 234                         GOTO(err_out, rc = PTR_ERR(dchild));
 235                 }
 236                 if (!dchild->d_inode) {
 237                         CWARN("%s: orphan %s has already been removed\n",
 238                               obd->obd_name, d_name);
 239                         GOTO(next, rc = 0);
 240                 }
 241
 242                 if (is_bad_inode(dchild->d_inode)) {
 243                         CERROR("%s: bad orphan inode found %lu/%u\n",
 244                                obd->obd_name, dchild->d_inode->i_ino,
 245                                dchild->d_inode->i_generation);
 246                         GOTO(next, rc = -ENOENT);
 247                 }
 248
 249                 child_inode = dchild->d_inode;
 250                 MDS_DOWN_READ_ORPHAN_SEM(child_inode);
 251                 if (mds_inode_is_orphan(child_inode) &&
 252                     mds_orphan_open_count(child_inode)) {
 253                         MDS_UP_READ_ORPHAN_SEM(child_inode);
 254                         CWARN("%s: orphan %s re-opened during recovery\n",
 255                               obd->obd_name, d_name);
 256                         GOTO(next, rc = 0);
 257                 }
 258                 MDS_UP_READ_ORPHAN_SEM(child_inode);
 259
 260                 rc = mds_unlink_orphan(obd, dchild, child_inode, pending_dir);
 261                 CDEBUG(D_INODE, "%s: removed orphan %s: rc %d\n",
 262                        obd->obd_name, d_name, rc);
 263                 if (rc == 0)
 264                         item++;
 265                 else
 266                         rc = 0;
 267 next:
 268                 l_dput(dchild);
 269                 UNLOCK_INODE_MUTEX(pending_dir);
 270         }
 271         rc = 0;
 272 err_out:
 273         list_for_each_entry_safe(dirent, n, &dentry_list, lld_list) {
 274                 list_del(&dirent->lld_list);
 275                 OBD_FREE(dirent, sizeof(*dirent));
 276         }
 277 err_pop:
 278         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 279         if (item > 0)
 280                 CWARN("%s: removed %d pending open-unlinked files\n",
 281                       obd->obd_name, item);
 282         RETURN(rc);
 283
 284 err_mntget:
 285         l_dput(mds->mds_pending_dir);
 286         goto err_pop;
 287 }