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TOMOYO Linux Cross Reference
Linux/fs/orangefs/super.c

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  1 /*
  2  * (C) 2001 Clemson University and The University of Chicago
  3  *
  4  * See COPYING in top-level directory.
  5  */
  6 
  7 #include "protocol.h"
  8 #include "orangefs-kernel.h"
  9 #include "orangefs-bufmap.h"
 10 
 11 #include <linux/parser.h>
 12 
 13 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
 14 static struct kmem_cache *orangefs_inode_cache;
 15 
 16 /* list for storing orangefs specific superblocks in use */
 17 LIST_HEAD(orangefs_superblocks);
 18 
 19 DEFINE_SPINLOCK(orangefs_superblocks_lock);
 20 
 21 enum {
 22         Opt_intr,
 23         Opt_acl,
 24         Opt_local_lock,
 25 
 26         Opt_err
 27 };
 28 
 29 static const match_table_t tokens = {
 30         { Opt_acl,              "acl" },
 31         { Opt_intr,             "intr" },
 32         { Opt_local_lock,       "local_lock" },
 33         { Opt_err,      NULL }
 34 };
 35 
 36 uint64_t orangefs_features;
 37 
 38 static int parse_mount_options(struct super_block *sb, char *options,
 39                 int silent)
 40 {
 41         struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
 42         substring_t args[MAX_OPT_ARGS];
 43         char *p;
 44 
 45         /*
 46          * Force any potential flags that might be set from the mount
 47          * to zero, ie, initialize to unset.
 48          */
 49         sb->s_flags &= ~MS_POSIXACL;
 50         orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
 51         orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
 52 
 53         while ((p = strsep(&options, ",")) != NULL) {
 54                 int token;
 55 
 56                 if (!*p)
 57                         continue;
 58 
 59                 token = match_token(p, tokens, args);
 60                 switch (token) {
 61                 case Opt_acl:
 62                         sb->s_flags |= MS_POSIXACL;
 63                         break;
 64                 case Opt_intr:
 65                         orangefs_sb->flags |= ORANGEFS_OPT_INTR;
 66                         break;
 67                 case Opt_local_lock:
 68                         orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
 69                         break;
 70                 default:
 71                         goto fail;
 72                 }
 73         }
 74 
 75         return 0;
 76 fail:
 77         if (!silent)
 78                 gossip_err("Error: mount option [%s] is not supported.\n", p);
 79         return -EINVAL;
 80 }
 81 
 82 static void orangefs_inode_cache_ctor(void *req)
 83 {
 84         struct orangefs_inode_s *orangefs_inode = req;
 85 
 86         inode_init_once(&orangefs_inode->vfs_inode);
 87         init_rwsem(&orangefs_inode->xattr_sem);
 88 
 89         orangefs_inode->vfs_inode.i_version = 1;
 90 }
 91 
 92 static struct inode *orangefs_alloc_inode(struct super_block *sb)
 93 {
 94         struct orangefs_inode_s *orangefs_inode;
 95 
 96         orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
 97         if (orangefs_inode == NULL) {
 98                 gossip_err("Failed to allocate orangefs_inode\n");
 99                 return NULL;
100         }
101 
102         /*
103          * We want to clear everything except for rw_semaphore and the
104          * vfs_inode.
105          */
106         memset(&orangefs_inode->refn.khandle, 0, 16);
107         orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
108         orangefs_inode->last_failed_block_index_read = 0;
109         memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
110         orangefs_inode->pinode_flags = 0;
111 
112         gossip_debug(GOSSIP_SUPER_DEBUG,
113                      "orangefs_alloc_inode: allocated %p\n",
114                      &orangefs_inode->vfs_inode);
115         return &orangefs_inode->vfs_inode;
116 }
117 
118 static void orangefs_i_callback(struct rcu_head *head)
119 {
120         struct inode *inode = container_of(head, struct inode, i_rcu);
121         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
122         kmem_cache_free(orangefs_inode_cache, orangefs_inode);
123 }
124 
125 static void orangefs_destroy_inode(struct inode *inode)
126 {
127         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
128 
129         gossip_debug(GOSSIP_SUPER_DEBUG,
130                         "%s: deallocated %p destroying inode %pU\n",
131                         __func__, orangefs_inode, get_khandle_from_ino(inode));
132 
133         call_rcu(&inode->i_rcu, orangefs_i_callback);
134 }
135 
136 /*
137  * NOTE: information filled in here is typically reflected in the
138  * output of the system command 'df'
139 */
140 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
141 {
142         int ret = -ENOMEM;
143         struct orangefs_kernel_op_s *new_op = NULL;
144         int flags = 0;
145         struct super_block *sb = NULL;
146 
147         sb = dentry->d_sb;
148 
149         gossip_debug(GOSSIP_SUPER_DEBUG,
150                      "orangefs_statfs: called on sb %p (fs_id is %d)\n",
151                      sb,
152                      (int)(ORANGEFS_SB(sb)->fs_id));
153 
154         new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
155         if (!new_op)
156                 return ret;
157         new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
158 
159         if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
160                 flags = ORANGEFS_OP_INTERRUPTIBLE;
161 
162         ret = service_operation(new_op, "orangefs_statfs", flags);
163 
164         if (new_op->downcall.status < 0)
165                 goto out_op_release;
166 
167         gossip_debug(GOSSIP_SUPER_DEBUG,
168                      "%s: got %ld blocks available | "
169                      "%ld blocks total | %ld block size | "
170                      "%ld files total | %ld files avail\n",
171                      __func__,
172                      (long)new_op->downcall.resp.statfs.blocks_avail,
173                      (long)new_op->downcall.resp.statfs.blocks_total,
174                      (long)new_op->downcall.resp.statfs.block_size,
175                      (long)new_op->downcall.resp.statfs.files_total,
176                      (long)new_op->downcall.resp.statfs.files_avail);
177 
178         buf->f_type = sb->s_magic;
179         memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
180         buf->f_bsize = new_op->downcall.resp.statfs.block_size;
181         buf->f_namelen = ORANGEFS_NAME_MAX;
182 
183         buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
184         buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
185         buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
186         buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
187         buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
188         buf->f_frsize = sb->s_blocksize;
189 
190 out_op_release:
191         op_release(new_op);
192         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
193         return ret;
194 }
195 
196 /*
197  * Remount as initiated by VFS layer.  We just need to reparse the mount
198  * options, no need to signal pvfs2-client-core about it.
199  */
200 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
201 {
202         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
203         return parse_mount_options(sb, data, 1);
204 }
205 
206 /*
207  * Remount as initiated by pvfs2-client-core on restart.  This is used to
208  * repopulate mount information left from previous pvfs2-client-core.
209  *
210  * the idea here is that given a valid superblock, we're
211  * re-initializing the user space client with the initial mount
212  * information specified when the super block was first initialized.
213  * this is very different than the first initialization/creation of a
214  * superblock.  we use the special service_priority_operation to make
215  * sure that the mount gets ahead of any other pending operation that
216  * is waiting for servicing.  this means that the pvfs2-client won't
217  * fail to start several times for all other pending operations before
218  * the client regains all of the mount information from us.
219  * NOTE: this function assumes that the request_mutex is already acquired!
220  */
221 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
222 {
223         struct orangefs_kernel_op_s *new_op;
224         int ret = -EINVAL;
225 
226         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
227 
228         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
229         if (!new_op)
230                 return -ENOMEM;
231         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
232                 orangefs_sb->devname,
233                 ORANGEFS_MAX_SERVER_ADDR_LEN);
234 
235         gossip_debug(GOSSIP_SUPER_DEBUG,
236                      "Attempting ORANGEFS Remount via host %s\n",
237                      new_op->upcall.req.fs_mount.orangefs_config_server);
238 
239         /*
240          * we assume that the calling function has already acquired the
241          * request_mutex to prevent other operations from bypassing
242          * this one
243          */
244         ret = service_operation(new_op, "orangefs_remount",
245                 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
246         gossip_debug(GOSSIP_SUPER_DEBUG,
247                      "orangefs_remount: mount got return value of %d\n",
248                      ret);
249         if (ret == 0) {
250                 /*
251                  * store the id assigned to this sb -- it's just a
252                  * short-lived mapping that the system interface uses
253                  * to map this superblock to a particular mount entry
254                  */
255                 orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
256                 orangefs_sb->mount_pending = 0;
257         }
258 
259         op_release(new_op);
260 
261         if (orangefs_userspace_version >= 20906) {
262                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
263                 if (!new_op)
264                         return -ENOMEM;
265                 new_op->upcall.req.features.features = 0;
266                 ret = service_operation(new_op, "orangefs_features",
267                     ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
268                 if (!ret)
269                         orangefs_features =
270                             new_op->downcall.resp.features.features;
271                 else
272                         orangefs_features = 0;
273                 op_release(new_op);
274         } else {
275                 orangefs_features = 0;
276         }
277 
278         return ret;
279 }
280 
281 int fsid_key_table_initialize(void)
282 {
283         return 0;
284 }
285 
286 void fsid_key_table_finalize(void)
287 {
288 }
289 
290 /* Called whenever the VFS dirties the inode in response to atime updates */
291 static void orangefs_dirty_inode(struct inode *inode, int flags)
292 {
293         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
294 
295         gossip_debug(GOSSIP_SUPER_DEBUG,
296                      "orangefs_dirty_inode: %pU\n",
297                      get_khandle_from_ino(inode));
298         SetAtimeFlag(orangefs_inode);
299 }
300 
301 static const struct super_operations orangefs_s_ops = {
302         .alloc_inode = orangefs_alloc_inode,
303         .destroy_inode = orangefs_destroy_inode,
304         .dirty_inode = orangefs_dirty_inode,
305         .drop_inode = generic_delete_inode,
306         .statfs = orangefs_statfs,
307         .remount_fs = orangefs_remount_fs,
308         .show_options = generic_show_options,
309 };
310 
311 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
312                                   struct fid *fid,
313                                   int fh_len,
314                                   int fh_type)
315 {
316         struct orangefs_object_kref refn;
317 
318         if (fh_len < 5 || fh_type > 2)
319                 return NULL;
320 
321         ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
322         refn.fs_id = (u32) fid->raw[4];
323         gossip_debug(GOSSIP_SUPER_DEBUG,
324                      "fh_to_dentry: handle %pU, fs_id %d\n",
325                      &refn.khandle,
326                      refn.fs_id);
327 
328         return d_obtain_alias(orangefs_iget(sb, &refn));
329 }
330 
331 static int orangefs_encode_fh(struct inode *inode,
332                     __u32 *fh,
333                     int *max_len,
334                     struct inode *parent)
335 {
336         int len = parent ? 10 : 5;
337         int type = 1;
338         struct orangefs_object_kref refn;
339 
340         if (*max_len < len) {
341                 gossip_lerr("fh buffer is too small for encoding\n");
342                 *max_len = len;
343                 type = 255;
344                 goto out;
345         }
346 
347         refn = ORANGEFS_I(inode)->refn;
348         ORANGEFS_khandle_to(&refn.khandle, fh, 16);
349         fh[4] = refn.fs_id;
350 
351         gossip_debug(GOSSIP_SUPER_DEBUG,
352                      "Encoding fh: handle %pU, fsid %u\n",
353                      &refn.khandle,
354                      refn.fs_id);
355 
356 
357         if (parent) {
358                 refn = ORANGEFS_I(parent)->refn;
359                 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
360                 fh[9] = refn.fs_id;
361 
362                 type = 2;
363                 gossip_debug(GOSSIP_SUPER_DEBUG,
364                              "Encoding parent: handle %pU, fsid %u\n",
365                              &refn.khandle,
366                              refn.fs_id);
367         }
368         *max_len = len;
369 
370 out:
371         return type;
372 }
373 
374 static const struct export_operations orangefs_export_ops = {
375         .encode_fh = orangefs_encode_fh,
376         .fh_to_dentry = orangefs_fh_to_dentry,
377 };
378 
379 static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
380 {
381         struct orangefs_kernel_op_s *op;
382         int r;
383         op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT);
384         if (!op)
385                 return -ENOMEM;
386         op->upcall.req.fs_umount.id = id;
387         op->upcall.req.fs_umount.fs_id = fs_id;
388         strncpy(op->upcall.req.fs_umount.orangefs_config_server,
389             devname, ORANGEFS_MAX_SERVER_ADDR_LEN);
390         r = service_operation(op, "orangefs_fs_umount", 0);
391         /* Not much to do about an error here. */
392         if (r)
393                 gossip_err("orangefs_unmount: service_operation %d\n", r);
394         op_release(op);
395         return r;
396 }
397 
398 static int orangefs_fill_sb(struct super_block *sb,
399                 struct orangefs_fs_mount_response *fs_mount,
400                 void *data, int silent)
401 {
402         int ret = -EINVAL;
403         struct inode *root = NULL;
404         struct dentry *root_dentry = NULL;
405         struct orangefs_object_kref root_object;
406 
407         /* alloc and init our private orangefs sb info */
408         sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
409         if (!ORANGEFS_SB(sb))
410                 return -ENOMEM;
411         ORANGEFS_SB(sb)->sb = sb;
412 
413         ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
414         ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
415         ORANGEFS_SB(sb)->id = fs_mount->id;
416 
417         if (data) {
418                 ret = parse_mount_options(sb, data, silent);
419                 if (ret)
420                         return ret;
421         }
422 
423         /* Hang the xattr handlers off the superblock */
424         sb->s_xattr = orangefs_xattr_handlers;
425         sb->s_magic = ORANGEFS_SUPER_MAGIC;
426         sb->s_op = &orangefs_s_ops;
427         sb->s_d_op = &orangefs_dentry_operations;
428 
429         sb->s_blocksize = orangefs_bufmap_size_query();
430         sb->s_blocksize_bits = orangefs_bufmap_shift_query();
431         sb->s_maxbytes = MAX_LFS_FILESIZE;
432 
433         root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
434         root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
435         gossip_debug(GOSSIP_SUPER_DEBUG,
436                      "get inode %pU, fsid %d\n",
437                      &root_object.khandle,
438                      root_object.fs_id);
439 
440         root = orangefs_iget(sb, &root_object);
441         if (IS_ERR(root))
442                 return PTR_ERR(root);
443 
444         gossip_debug(GOSSIP_SUPER_DEBUG,
445                      "Allocated root inode [%p] with mode %x\n",
446                      root,
447                      root->i_mode);
448 
449         /* allocates and places root dentry in dcache */
450         root_dentry = d_make_root(root);
451         if (!root_dentry)
452                 return -ENOMEM;
453 
454         sb->s_export_op = &orangefs_export_ops;
455         sb->s_root = root_dentry;
456         return 0;
457 }
458 
459 struct dentry *orangefs_mount(struct file_system_type *fst,
460                            int flags,
461                            const char *devname,
462                            void *data)
463 {
464         int ret = -EINVAL;
465         struct super_block *sb = ERR_PTR(-EINVAL);
466         struct orangefs_kernel_op_s *new_op;
467         struct dentry *d = ERR_PTR(-EINVAL);
468 
469         gossip_debug(GOSSIP_SUPER_DEBUG,
470                      "orangefs_mount: called with devname %s\n",
471                      devname);
472 
473         if (!devname) {
474                 gossip_err("ERROR: device name not specified.\n");
475                 return ERR_PTR(-EINVAL);
476         }
477 
478         new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
479         if (!new_op)
480                 return ERR_PTR(-ENOMEM);
481 
482         strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
483                 devname,
484                 ORANGEFS_MAX_SERVER_ADDR_LEN);
485 
486         gossip_debug(GOSSIP_SUPER_DEBUG,
487                      "Attempting ORANGEFS Mount via host %s\n",
488                      new_op->upcall.req.fs_mount.orangefs_config_server);
489 
490         ret = service_operation(new_op, "orangefs_mount", 0);
491         gossip_debug(GOSSIP_SUPER_DEBUG,
492                      "orangefs_mount: mount got return value of %d\n", ret);
493         if (ret)
494                 goto free_op;
495 
496         if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
497                 gossip_err("ERROR: Retrieved null fs_id\n");
498                 ret = -EINVAL;
499                 goto free_op;
500         }
501 
502         sb = sget(fst, NULL, set_anon_super, flags, NULL);
503 
504         if (IS_ERR(sb)) {
505                 d = ERR_CAST(sb);
506                 orangefs_unmount(new_op->downcall.resp.fs_mount.id,
507                     new_op->downcall.resp.fs_mount.fs_id, devname);
508                 goto free_op;
509         }
510 
511         ret = orangefs_fill_sb(sb,
512               &new_op->downcall.resp.fs_mount, data,
513               flags & MS_SILENT ? 1 : 0);
514 
515         if (ret) {
516                 d = ERR_PTR(ret);
517                 goto free_sb_and_op;
518         }
519 
520         /*
521          * on successful mount, store the devname and data
522          * used
523          */
524         strncpy(ORANGEFS_SB(sb)->devname,
525                 devname,
526                 ORANGEFS_MAX_SERVER_ADDR_LEN);
527 
528         /* mount_pending must be cleared */
529         ORANGEFS_SB(sb)->mount_pending = 0;
530 
531         /*
532          * finally, add this sb to our list of known orangefs
533          * sb's
534          */
535         gossip_debug(GOSSIP_SUPER_DEBUG,
536                      "Adding SB %p to orangefs superblocks\n",
537                      ORANGEFS_SB(sb));
538         spin_lock(&orangefs_superblocks_lock);
539         list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
540         spin_unlock(&orangefs_superblocks_lock);
541         op_release(new_op);
542 
543         /* Must be removed from the list now. */
544         ORANGEFS_SB(sb)->no_list = 0;
545 
546         if (orangefs_userspace_version >= 20906) {
547                 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES);
548                 if (!new_op)
549                         return ERR_PTR(-ENOMEM);
550                 new_op->upcall.req.features.features = 0;
551                 ret = service_operation(new_op, "orangefs_features", 0);
552                 orangefs_features = new_op->downcall.resp.features.features;
553                 op_release(new_op);
554         } else {
555                 orangefs_features = 0;
556         }
557 
558         return dget(sb->s_root);
559 
560 free_sb_and_op:
561         /* Will call orangefs_kill_sb with sb not in list. */
562         ORANGEFS_SB(sb)->no_list = 1;
563         /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */
564         deactivate_locked_super(sb);
565 free_op:
566         gossip_err("orangefs_mount: mount request failed with %d\n", ret);
567         if (ret == -EINVAL) {
568                 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
569                 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
570         }
571 
572         op_release(new_op);
573 
574         return d;
575 }
576 
577 void orangefs_kill_sb(struct super_block *sb)
578 {
579         int r;
580         gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
581 
582         /* provided sb cleanup */
583         kill_anon_super(sb);
584 
585         /*
586          * issue the unmount to userspace to tell it to remove the
587          * dynamic mount info it has for this superblock
588          */
589         r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id,
590             ORANGEFS_SB(sb)->devname);
591         if (!r)
592                 ORANGEFS_SB(sb)->mount_pending = 1;
593 
594         if (!ORANGEFS_SB(sb)->no_list) {
595                 /* remove the sb from our list of orangefs specific sb's */
596                 spin_lock(&orangefs_superblocks_lock);
597                 /* not list_del_init */
598                 __list_del_entry(&ORANGEFS_SB(sb)->list);
599                 ORANGEFS_SB(sb)->list.prev = NULL;
600                 spin_unlock(&orangefs_superblocks_lock);
601         }
602 
603         /*
604          * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
605          * gets completed before we free the dang thing.
606          */
607         mutex_lock(&orangefs_request_mutex);
608         mutex_unlock(&orangefs_request_mutex);
609 
610         /* free the orangefs superblock private data */
611         kfree(ORANGEFS_SB(sb));
612 }
613 
614 int orangefs_inode_cache_initialize(void)
615 {
616         orangefs_inode_cache = kmem_cache_create("orangefs_inode_cache",
617                                               sizeof(struct orangefs_inode_s),
618                                               0,
619                                               ORANGEFS_CACHE_CREATE_FLAGS,
620                                               orangefs_inode_cache_ctor);
621 
622         if (!orangefs_inode_cache) {
623                 gossip_err("Cannot create orangefs_inode_cache\n");
624                 return -ENOMEM;
625         }
626         return 0;
627 }
628 
629 int orangefs_inode_cache_finalize(void)
630 {
631         kmem_cache_destroy(orangefs_inode_cache);
632         return 0;
633 }
634 

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