fs/orangefs/super.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * (C) 2001 Clemson University and The University of Chicago
0004  *
0005  * See COPYING in top-level directory.
0006  */
0007
0008 #include "protocol.h"
0009 #include "orangefs-kernel.h"
0010 #include "orangefs-bufmap.h"
0011
0012 #include <linux/parser.h>
0013 #include <linux/hashtable.h>
0014 #include <linux/seq_file.h>
0015
0016 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
0017 static struct kmem_cache *orangefs_inode_cache;
0018
0019 /* list for storing orangefs specific superblocks in use */
0020 LIST_HEAD(orangefs_superblocks);
0021
0022 DEFINE_SPINLOCK(orangefs_superblocks_lock);
0023
0024 enum {
0025     Opt_intr,
0026     Opt_acl,
0027     Opt_local_lock,
0028
0029     Opt_err
0030 };
0031
0032 static const match_table_t tokens = {
0033     { Opt_acl,      "acl" },
0034     { Opt_intr,     "intr" },
0035     { Opt_local_lock,   "local_lock" },
0036     { Opt_err,  NULL }
0037 };
0038
0039 uint64_t orangefs_features;
0040
0041 static int orangefs_show_options(struct seq_file *m, struct dentry *root)
0042 {
0043     struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(root->d_sb);
0044
0045     if (root->d_sb->s_flags & SB_POSIXACL)
0046         seq_puts(m, ",acl");
0047     if (orangefs_sb->flags & ORANGEFS_OPT_INTR)
0048         seq_puts(m, ",intr");
0049     if (orangefs_sb->flags & ORANGEFS_OPT_LOCAL_LOCK)
0050         seq_puts(m, ",local_lock");
0051     return 0;
0052 }
0053
0054 static int parse_mount_options(struct super_block *sb, char *options,
0055         int silent)
0056 {
0057     struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
0058     substring_t args[MAX_OPT_ARGS];
0059     char *p;
0060
0061     /*
0062      * Force any potential flags that might be set from the mount
0063      * to zero, ie, initialize to unset.
0064      */
0065     sb->s_flags &= ~SB_POSIXACL;
0066     orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
0067     orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
0068
0069     while ((p = strsep(&options, ",")) != NULL) {
0070         int token;
0071
0072         if (!*p)
0073             continue;
0074
0075         token = match_token(p, tokens, args);
0076         switch (token) {
0077         case Opt_acl:
0078             sb->s_flags |= SB_POSIXACL;
0079             break;
0080         case Opt_intr:
0081             orangefs_sb->flags |= ORANGEFS_OPT_INTR;
0082             break;
0083         case Opt_local_lock:
0084             orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
0085             break;
0086         default:
0087             goto fail;
0088         }
0089     }
0090
0091     return 0;
0092 fail:
0093     if (!silent)
0094         gossip_err("Error: mount option [%s] is not supported.\n", p);
0095     return -EINVAL;
0096 }
0097
0098 static void orangefs_inode_cache_ctor(void *req)
0099 {
0100     struct orangefs_inode_s *orangefs_inode = req;
0101
0102     inode_init_once(&orangefs_inode->vfs_inode);
0103     init_rwsem(&orangefs_inode->xattr_sem);
0104 }
0105
0106 static struct inode *orangefs_alloc_inode(struct super_block *sb)
0107 {
0108     struct orangefs_inode_s *orangefs_inode;
0109
0110     orangefs_inode = alloc_inode_sb(sb, orangefs_inode_cache, GFP_KERNEL);
0111     if (!orangefs_inode)
0112         return NULL;
0113
0114     /*
0115      * We want to clear everything except for rw_semaphore and the
0116      * vfs_inode.
0117      */
0118     memset(&orangefs_inode->refn.khandle, 0, 16);
0119     orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
0120     orangefs_inode->last_failed_block_index_read = 0;
0121     memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
0122
0123     gossip_debug(GOSSIP_SUPER_DEBUG,
0124              "orangefs_alloc_inode: allocated %p\n",
0125              &orangefs_inode->vfs_inode);
0126     return &orangefs_inode->vfs_inode;
0127 }
0128
0129 static void orangefs_free_inode(struct inode *inode)
0130 {
0131     struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
0132     struct orangefs_cached_xattr *cx;
0133     struct hlist_node *tmp;
0134     int i;
0135
0136     hash_for_each_safe(orangefs_inode->xattr_cache, i, tmp, cx, node) {
0137         hlist_del(&cx->node);
0138         kfree(cx);
0139     }
0140
0141     kmem_cache_free(orangefs_inode_cache, orangefs_inode);
0142 }
0143
0144 static void orangefs_destroy_inode(struct inode *inode)
0145 {
0146     struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
0147
0148     gossip_debug(GOSSIP_SUPER_DEBUG,
0149             "%s: deallocated %p destroying inode %pU\n",
0150             __func__, orangefs_inode, get_khandle_from_ino(inode));
0151 }
0152
0153 static int orangefs_write_inode(struct inode *inode,
0154                 struct writeback_control *wbc)
0155 {
0156     gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_write_inode\n");
0157     return orangefs_inode_setattr(inode);
0158 }
0159
0160 /*
0161  * NOTE: information filled in here is typically reflected in the
0162  * output of the system command 'df'
0163 */
0164 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
0165 {
0166     int ret = -ENOMEM;
0167     struct orangefs_kernel_op_s *new_op = NULL;
0168     int flags = 0;
0169     struct super_block *sb = NULL;
0170
0171     sb = dentry->d_sb;
0172
0173     gossip_debug(GOSSIP_SUPER_DEBUG,
0174             "%s: called on sb %p (fs_id is %d)\n",
0175             __func__,
0176             sb,
0177             (int)(ORANGEFS_SB(sb)->fs_id));
0178
0179     new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
0180     if (!new_op)
0181         return ret;
0182     new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
0183
0184     if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
0185         flags = ORANGEFS_OP_INTERRUPTIBLE;
0186
0187     ret = service_operation(new_op, "orangefs_statfs", flags);
0188
0189     if (new_op->downcall.status < 0)
0190         goto out_op_release;
0191
0192     gossip_debug(GOSSIP_SUPER_DEBUG,
0193              "%s: got %ld blocks available | "
0194              "%ld blocks total | %ld block size | "
0195              "%ld files total | %ld files avail\n",
0196              __func__,
0197              (long)new_op->downcall.resp.statfs.blocks_avail,
0198              (long)new_op->downcall.resp.statfs.blocks_total,
0199              (long)new_op->downcall.resp.statfs.block_size,
0200              (long)new_op->downcall.resp.statfs.files_total,
0201              (long)new_op->downcall.resp.statfs.files_avail);
0202
0203     buf->f_type = sb->s_magic;
0204     memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
0205     buf->f_bsize = new_op->downcall.resp.statfs.block_size;
0206     buf->f_namelen = ORANGEFS_NAME_MAX;
0207
0208     buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
0209     buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
0210     buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
0211     buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
0212     buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
0213     buf->f_frsize = 0;
0214
0215 out_op_release:
0216     op_release(new_op);
0217     gossip_debug(GOSSIP_SUPER_DEBUG, "%s: returning %d\n", __func__, ret);
0218     return ret;
0219 }
0220
0221 /*
0222  * Remount as initiated by VFS layer.  We just need to reparse the mount
0223  * options, no need to signal pvfs2-client-core about it.
0224  */
0225 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
0226 {
0227     gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
0228     return parse_mount_options(sb, data, 1);
0229 }
0230
0231 /*
0232  * Remount as initiated by pvfs2-client-core on restart.  This is used to
0233  * repopulate mount information left from previous pvfs2-client-core.
0234  *
0235  * the idea here is that given a valid superblock, we're
0236  * re-initializing the user space client with the initial mount
0237  * information specified when the super block was first initialized.
0238  * this is very different than the first initialization/creation of a
0239  * superblock.  we use the special service_priority_operation to make
0240  * sure that the mount gets ahead of any other pending operation that
0241  * is waiting for servicing.  this means that the pvfs2-client won't
0242  * fail to start several times for all other pending operations before
0243  * the client regains all of the mount information from us.
0244  * NOTE: this function assumes that the request_mutex is already acquired!
0245  */
0246 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
0247 {
0248     struct orangefs_kernel_op_s *new_op;
0249     int ret = -EINVAL;
0250
0251     gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
0252
0253     new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
0254     if (!new_op)
0255         return -ENOMEM;
0256     strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
0257         orangefs_sb->devname,
0258         ORANGEFS_MAX_SERVER_ADDR_LEN);
0259
0260     gossip_debug(GOSSIP_SUPER_DEBUG,
0261              "Attempting ORANGEFS Remount via host %s\n",
0262              new_op->upcall.req.fs_mount.orangefs_config_server);
0263
0264     /*
0265      * we assume that the calling function has already acquired the
0266      * request_mutex to prevent other operations from bypassing
0267      * this one
0268      */
0269     ret = service_operation(new_op, "orangefs_remount",
0270         ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
0271     gossip_debug(GOSSIP_SUPER_DEBUG,
0272              "orangefs_remount: mount got return value of %d\n",
0273              ret);
0274     if (ret == 0) {
0275         /*
0276          * store the id assigned to this sb -- it's just a
0277          * short-lived mapping that the system interface uses
0278          * to map this superblock to a particular mount entry
0279          */
0280         orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
0281         orangefs_sb->mount_pending = 0;
0282     }
0283
0284     op_release(new_op);
0285
0286     if (orangefs_userspace_version >= 20906) {
0287         new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
0288         if (!new_op)
0289             return -ENOMEM;
0290         new_op->upcall.req.features.features = 0;
0291         ret = service_operation(new_op, "orangefs_features",
0292             ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
0293         if (!ret)
0294             orangefs_features =
0295                 new_op->downcall.resp.features.features;
0296         else
0297             orangefs_features = 0;
0298         op_release(new_op);
0299     } else {
0300         orangefs_features = 0;
0301     }
0302
0303     return ret;
0304 }
0305
0306 int fsid_key_table_initialize(void)
0307 {
0308     return 0;
0309 }
0310
0311 void fsid_key_table_finalize(void)
0312 {
0313 }
0314
0315 static const struct super_operations orangefs_s_ops = {
0316     .alloc_inode = orangefs_alloc_inode,
0317     .free_inode = orangefs_free_inode,
0318     .destroy_inode = orangefs_destroy_inode,
0319     .write_inode = orangefs_write_inode,
0320     .drop_inode = generic_delete_inode,
0321     .statfs = orangefs_statfs,
0322     .remount_fs = orangefs_remount_fs,
0323     .show_options = orangefs_show_options,
0324 };
0325
0326 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
0327                   struct fid *fid,
0328                   int fh_len,
0329                   int fh_type)
0330 {
0331     struct orangefs_object_kref refn;
0332
0333     if (fh_len < 5 || fh_type > 2)
0334         return NULL;
0335
0336     ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
0337     refn.fs_id = (u32) fid->raw[4];
0338     gossip_debug(GOSSIP_SUPER_DEBUG,
0339              "fh_to_dentry: handle %pU, fs_id %d\n",
0340              &refn.khandle,
0341              refn.fs_id);
0342
0343     return d_obtain_alias(orangefs_iget(sb, &refn));
0344 }
0345
0346 static int orangefs_encode_fh(struct inode *inode,
0347             __u32 *fh,
0348             int *max_len,
0349             struct inode *parent)
0350 {
0351     int len = parent ? 10 : 5;
0352     int type = 1;
0353     struct orangefs_object_kref refn;
0354
0355     if (*max_len < len) {
0356         gossip_err("fh buffer is too small for encoding\n");
0357         *max_len = len;
0358         type = 255;
0359         goto out;
0360     }
0361
0362     refn = ORANGEFS_I(inode)->refn;
0363     ORANGEFS_khandle_to(&refn.khandle, fh, 16);
0364     fh[4] = refn.fs_id;
0365
0366     gossip_debug(GOSSIP_SUPER_DEBUG,
0367              "Encoding fh: handle %pU, fsid %u\n",
0368              &refn.khandle,
0369              refn.fs_id);
0370
0371
0372     if (parent) {
0373         refn = ORANGEFS_I(parent)->refn;
0374         ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
0375         fh[9] = refn.fs_id;
0376
0377         type = 2;
0378         gossip_debug(GOSSIP_SUPER_DEBUG,
0379                  "Encoding parent: handle %pU, fsid %u\n",
0380                  &refn.khandle,
0381                  refn.fs_id);
0382     }
0383     *max_len = len;
0384
0385 out:
0386     return type;
0387 }
0388
0389 static const struct export_operations orangefs_export_ops = {
0390     .encode_fh = orangefs_encode_fh,
0391     .fh_to_dentry = orangefs_fh_to_dentry,
0392 };
0393
0394 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
0395 {
0396     struct orangefs_kernel_op_s *op;
0397     int r;
0398     op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
0399     if (!op)
0400         return -ENOMEM;
0401     op->upcall.req.fs_umount.id = id;
0402     op->upcall.req.fs_umount.fs_id = fs_id;
0403     strncpy(op->upcall.req.fs_umount.orangefs_config_server,
0404         devname, ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
0405     r = service_operation(op, "orangefs_fs_umount", 0);
0406     /* Not much to do about an error here. */
0407     if (r)
0408         gossip_err("orangefs_unmount: service_operation %d\n", r);
0409     op_release(op);
0410     return r;
0411 }
0412
0413 static int orangefs_fill_sb(struct super_block *sb,
0414         struct orangefs_fs_mount_response *fs_mount,
0415         void *data, int silent)
0416 {
0417     int ret;
0418     struct inode *root;
0419     struct dentry *root_dentry;
0420     struct orangefs_object_kref root_object;
0421
0422     ORANGEFS_SB(sb)->sb = sb;
0423
0424     ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
0425     ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
0426     ORANGEFS_SB(sb)->id = fs_mount->id;
0427
0428     if (data) {
0429         ret = parse_mount_options(sb, data, silent);
0430         if (ret)
0431             return ret;
0432     }
0433
0434     /* Hang the xattr handlers off the superblock */
0435     sb->s_xattr = orangefs_xattr_handlers;
0436     sb->s_magic = ORANGEFS_SUPER_MAGIC;
0437     sb->s_op = &orangefs_s_ops;
0438     sb->s_d_op = &orangefs_dentry_operations;
0439
0440     sb->s_blocksize = PAGE_SIZE;
0441     sb->s_blocksize_bits = PAGE_SHIFT;
0442     sb->s_maxbytes = MAX_LFS_FILESIZE;
0443
0444     ret = super_setup_bdi(sb);
0445     if (ret)
0446         return ret;
0447
0448     root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
0449     root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
0450     gossip_debug(GOSSIP_SUPER_DEBUG,
0451              "get inode %pU, fsid %d\n",
0452              &root_object.khandle,
0453              root_object.fs_id);
0454
0455     root = orangefs_iget(sb, &root_object);
0456     if (IS_ERR(root))
0457         return PTR_ERR(root);
0458
0459     gossip_debug(GOSSIP_SUPER_DEBUG,
0460              "Allocated root inode [%p] with mode %x\n",
0461              root,
0462              root->i_mode);
0463
0464     /* allocates and places root dentry in dcache */
0465     root_dentry = d_make_root(root);
0466     if (!root_dentry)
0467         return -ENOMEM;
0468
0469     sb->s_export_op = &orangefs_export_ops;
0470     sb->s_root = root_dentry;
0471     return 0;
0472 }
0473
0474 struct dentry *orangefs_mount(struct file_system_type *fst,
0475                int flags,
0476                const char *devname,
0477                void *data)
0478 {
0479     int ret;
0480     struct super_block *sb = ERR_PTR(-EINVAL);
0481     struct orangefs_kernel_op_s *new_op;
0482     struct dentry *d = ERR_PTR(-EINVAL);
0483
0484     gossip_debug(GOSSIP_SUPER_DEBUG,
0485              "orangefs_mount: called with devname %s\n",
0486              devname);
0487
0488     if (!devname) {
0489         gossip_err("ERROR: device name not specified.\n");
0490         return ERR_PTR(-EINVAL);
0491     }
0492
0493     new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
0494     if (!new_op)
0495         return ERR_PTR(-ENOMEM);
0496
0497     strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
0498         devname,
0499         ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
0500
0501     gossip_debug(GOSSIP_SUPER_DEBUG,
0502              "Attempting ORANGEFS Mount via host %s\n",
0503              new_op->upcall.req.fs_mount.orangefs_config_server);
0504
0505     ret = service_operation(new_op, "orangefs_mount", 0);
0506     gossip_debug(GOSSIP_SUPER_DEBUG,
0507              "orangefs_mount: mount got return value of %d\n", ret);
0508     if (ret)
0509         goto free_op;
0510
0511     if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
0512         gossip_err("ERROR: Retrieved null fs_id\n");
0513         ret = -EINVAL;
0514         goto free_op;
0515     }
0516
0517     sb = sget(fst, NULL, set_anon_super, flags, NULL);
0518
0519     if (IS_ERR(sb)) {
0520         d = ERR_CAST(sb);
0521         orangefs_unmount(new_op->downcall.resp.fs_mount.id,
0522             new_op->downcall.resp.fs_mount.fs_id, devname);
0523         goto free_op;
0524     }
0525
0526     /* alloc and init our private orangefs sb info */
0527     sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
0528     if (!ORANGEFS_SB(sb)) {
0529         d = ERR_PTR(-ENOMEM);
0530         goto free_sb_and_op;
0531     }
0532
0533     ret = orangefs_fill_sb(sb,
0534           &new_op->downcall.resp.fs_mount, data,
0535           flags & SB_SILENT ? 1 : 0);
0536
0537     if (ret) {
0538         d = ERR_PTR(ret);
0539         goto free_sb_and_op;
0540     }
0541
0542     /*
0543      * on successful mount, store the devname and data
0544      * used
0545      */
0546     strncpy(ORANGEFS_SB(sb)->devname,
0547         devname,
0548         ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
0549
0550     /* mount_pending must be cleared */
0551     ORANGEFS_SB(sb)->mount_pending = 0;
0552
0553     /*
0554      * finally, add this sb to our list of known orangefs
0555      * sb's
0556      */
0557     gossip_debug(GOSSIP_SUPER_DEBUG,
0558              "Adding SB %p to orangefs superblocks\n",
0559              ORANGEFS_SB(sb));
0560     spin_lock(&orangefs_superblocks_lock);
0561     list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
0562     spin_unlock(&orangefs_superblocks_lock);
0563     op_release(new_op);
0564
0565     /* Must be removed from the list now. */
0566     ORANGEFS_SB(sb)->no_list = 0;
0567
0568     if (orangefs_userspace_version >= 20906) {
0569         new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
0570         if (!new_op)
0571             return ERR_PTR(-ENOMEM);
0572         new_op->upcall.req.features.features = 0;
0573         ret = service_operation(new_op, "orangefs_features", 0);
0574         orangefs_features = new_op->downcall.resp.features.features;
0575         op_release(new_op);
0576     } else {
0577         orangefs_features = 0;
0578     }
0579
0580     return dget(sb->s_root);
0581
0582 free_sb_and_op:
0583     /* Will call orangefs_kill_sb with sb not in list. */
0584     ORANGEFS_SB(sb)->no_list = 1;
0585     /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
0586     deactivate_locked_super(sb);
0587 free_op:
0588     gossip_err("orangefs_mount: mount request failed with %d\n", ret);
0589     if (ret == -EINVAL) {
0590         gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
0591         gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
0592     }
0593
0594     op_release(new_op);
0595
0596     return d;
0597 }
0598
0599 void orangefs_kill_sb(struct super_block *sb)
0600 {
0601     int r;
0602     gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
0603
0604     /* provided sb cleanup */
0605     kill_anon_super(sb);
0606
0607     if (!ORANGEFS_SB(sb)) {
0608         mutex_lock(&orangefs_request_mutex);
0609         mutex_unlock(&orangefs_request_mutex);
0610         return;
0611     }
0612     /*
0613      * issue the unmount to userspace to tell it to remove the
0614      * dynamic mount info it has for this superblock
0615      */
0616     r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id,
0617         ORANGEFS_SB(sb)->devname);
0618     if (!r)
0619         ORANGEFS_SB(sb)->mount_pending = 1;
0620
0621     if (!ORANGEFS_SB(sb)->no_list) {
0622         /* remove the sb from our list of orangefs specific sb's */
0623         spin_lock(&orangefs_superblocks_lock);
0624         /* not list_del_init */
0625         __list_del_entry(&ORANGEFS_SB(sb)->list);
0626         ORANGEFS_SB(sb)->list.prev = NULL;
0627         spin_unlock(&orangefs_superblocks_lock);
0628     }
0629
0630     /*
0631      * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
0632      * gets completed before we free the dang thing.
0633      */
0634     mutex_lock(&orangefs_request_mutex);
0635     mutex_unlock(&orangefs_request_mutex);
0636
0637     /* free the orangefs superblock private data */
0638     kfree(ORANGEFS_SB(sb));
0639 }
0640
0641 int orangefs_inode_cache_initialize(void)
0642 {
0643     orangefs_inode_cache = kmem_cache_create_usercopy(
0644                     "orangefs_inode_cache",
0645                     sizeof(struct orangefs_inode_s),
0646                     0,
0647                     ORANGEFS_CACHE_CREATE_FLAGS,
0648                     offsetof(struct orangefs_inode_s,
0649                         link_target),
0650                     sizeof_field(struct orangefs_inode_s,
0651                         link_target),
0652                     orangefs_inode_cache_ctor);
0653
0654     if (!orangefs_inode_cache) {
0655         gossip_err("Cannot create orangefs_inode_cache\n");
0656         return -ENOMEM;
0657     }
0658     return 0;
0659 }
0660
0661 int orangefs_inode_cache_finalize(void)
0662 {
0663     kmem_cache_destroy(orangefs_inode_cache);
0664     return 0;
0665 }