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LU-1842 quota: remove quota code
[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_compat.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2012, Whamcloud, Inc.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/osd/osd_compat.c
37  *
38  * on-disk compatibility stuff for OST
39  *
40  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
41  */
42
43 /* LUSTRE_VERSION_CODE */
44 #include <lustre_ver.h>
45 /* prerequisite for linux/xattr.h */
46 #include <linux/types.h>
47 /* prerequisite for linux/xattr.h */
48 #include <linux/fs.h>
49
50 /*
51  * struct OBD_{ALLOC,FREE}*()
52  * OBD_FAIL_CHECK
53  */
54 #include <obd_support.h>
55 #include <lvfs.h>
56
57 #include "osd_internal.h"
58 #include "osd_oi.h"
59
60 struct osd_compat_objid_seq {
61         /* protects on-fly initialization */
62         cfs_semaphore_t        dir_init_sem;
63         /* file storing last created objid */
64         struct osd_inode_id    last_id;
65         struct dentry         *groot; /* O/<seq> */
66         struct dentry        **dirs;  /* O/<seq>/d0-dXX */
67 };
68
69 #define MAX_OBJID_GROUP (FID_SEQ_ECHO + 1)
70
71 struct osd_compat_objid {
72         int                          subdir_count;
73         struct dentry               *root;
74         struct osd_inode_id          last_rcvd_id;
75         struct osd_inode_id          last_seq_id;
76         struct osd_compat_objid_seq  groups[MAX_OBJID_GROUP];
77 };
78
79 static void osd_push_ctxt(const struct osd_device *dev,
80                           struct lvfs_run_ctxt *newctxt,
81                           struct lvfs_run_ctxt *save)
82 {
83         OBD_SET_CTXT_MAGIC(newctxt);
84         newctxt->pwdmnt = dev->od_mnt;
85         newctxt->pwd = dev->od_mnt->mnt_root;
86         newctxt->fs = get_ds();
87
88         push_ctxt(save, newctxt, NULL);
89 }
90
91 void osd_compat_seq_fini(struct osd_device *osd, int seq)
92 {
93         struct osd_compat_objid_seq *grp;
94         struct osd_compat_objid     *map = osd->od_ost_map;
95         int                          i;
96
97         ENTRY;
98
99         grp = &map->groups[seq];
100         if (grp->groot ==NULL)
101                 RETURN_EXIT;
102         LASSERT(grp->dirs);
103
104         for (i = 0; i < map->subdir_count; i++) {
105                 if (grp->dirs[i] == NULL)
106                         break;
107                 dput(grp->dirs[i]);
108         }
109
110         OBD_FREE(grp->dirs, sizeof(struct dentry *) * map->subdir_count);
111         dput(grp->groot);
112         EXIT;
113 }
114
115 int osd_compat_seq_init(struct osd_device *osd, int seq)
116 {
117         struct osd_compat_objid_seq *grp;
118         struct osd_compat_objid     *map;
119         struct dentry               *d;
120         int                          rc = 0;
121         char                         name[32];
122         int                          i;
123         ENTRY;
124
125         map = osd->od_ost_map;
126         LASSERT(map);
127         LASSERT(map->root);
128         grp = &map->groups[seq];
129
130         if (grp->groot != NULL)
131                 RETURN(0);
132
133         cfs_down(&grp->dir_init_sem);
134
135         sprintf(name, "%d", seq);
136         d = simple_mkdir(map->root, osd->od_mnt, name, 0755, 1);
137         if (IS_ERR(d)) {
138                 rc = PTR_ERR(d);
139                 GOTO(out, rc);
140         } else if (d->d_inode == NULL) {
141                 rc = -EFAULT;
142                 dput(d);
143                 GOTO(out, rc);
144         }
145
146         LASSERT(grp->dirs == NULL);
147         OBD_ALLOC(grp->dirs, sizeof(d) * map->subdir_count);
148         if (grp->dirs == NULL) {
149                 dput(d);
150                 GOTO(out, rc = -ENOMEM);
151         }
152
153         grp->groot = d;
154         for (i = 0; i < map->subdir_count; i++) {
155                 sprintf(name, "d%d", i);
156                 d = simple_mkdir(grp->groot, osd->od_mnt, name, 0755, 1);
157                 if (IS_ERR(d)) {
158                         rc = PTR_ERR(d);
159                         break;
160                 } else if (d->d_inode == NULL) {
161                         rc = -EFAULT;
162                         dput(d);
163                         break;
164                 }
165
166                 grp->dirs[i] = d;
167         }
168
169         if (rc)
170                 osd_compat_seq_fini(osd, seq);
171 out:
172         cfs_up(&grp->dir_init_sem);
173         RETURN(rc);
174 }
175
176 int osd_last_rcvd_subdir_count(struct osd_device *osd)
177 {
178         struct lr_server_data lsd;
179         struct dentry        *dlast;
180         loff_t                off;
181         int                   rc = 0;
182         int                   count = FILTER_SUBDIR_COUNT;
183
184         ENTRY;
185
186         dlast = ll_lookup_one_len(LAST_RCVD, osd_sb(osd)->s_root,
187                                   strlen(LAST_RCVD));
188         if (IS_ERR(dlast))
189                 return PTR_ERR(dlast);
190         else if (dlast->d_inode == NULL)
191                 goto out;
192
193         off = 0;
194         rc = osd_ldiskfs_read(dlast->d_inode, &lsd, sizeof(lsd), &off);
195         if (rc == sizeof(lsd)) {
196                 CDEBUG(D_INFO, "read last_rcvd header, uuid = %s, "
197                        "subdir count = %d\n", lsd.lsd_uuid,
198                        lsd.lsd_subdir_count);
199                 if (le16_to_cpu(lsd.lsd_subdir_count) > 0)
200                         count = le16_to_cpu(lsd.lsd_subdir_count);
201         } else if (rc != 0) {
202                 CERROR("Can't read last_rcvd file, rc = %d\n", rc);
203                 if (rc > 0)
204                         rc = -EFAULT;
205                 dput(dlast);
206                 return rc;
207         }
208 out:
209         dput(dlast);
210         LASSERT(count > 0);
211         return count;
212 }
213
214 void osd_compat_fini(struct osd_device *dev)
215 {
216         int i;
217
218         ENTRY;
219
220         if (dev->od_ost_map == NULL)
221                 RETURN_EXIT;
222
223         for (i = 0; i < MAX_OBJID_GROUP; i++)
224                 osd_compat_seq_fini(dev, i);
225
226         dput(dev->od_ost_map->root);
227         OBD_FREE_PTR(dev->od_ost_map);
228         dev->od_ost_map = NULL;
229
230         EXIT;
231 }
232
233 /*
234  * directory structure on legacy OST:
235  *
236  * O/<seq>/d0-31/<objid>
237  * O/<seq>/LAST_ID
238  * last_rcvd
239  * LAST_GROUP
240  * CONFIGS
241  *
242  */
243 int osd_compat_init(struct osd_device *dev)
244 {
245         struct lvfs_run_ctxt  new;
246         struct lvfs_run_ctxt  save;
247         struct dentry        *rootd = osd_sb(dev)->s_root;
248         struct dentry        *d;
249         int                   rc;
250         int                   i;
251
252         ENTRY;
253
254         OBD_ALLOC_PTR(dev->od_ost_map);
255         if (dev->od_ost_map == NULL)
256                 RETURN(-ENOMEM);
257
258         /* to get subdir count from last_rcvd */
259         rc = osd_last_rcvd_subdir_count(dev);
260         if (rc < 0) {
261                 OBD_FREE_PTR(dev->od_ost_map);
262                 RETURN(rc);
263         }
264
265         dev->od_ost_map->subdir_count = rc;
266         rc = 0;
267
268         LASSERT(dev->od_fsops);
269         osd_push_ctxt(dev, &new, &save);
270
271         d = simple_mkdir(rootd, dev->od_mnt, "O", 0755, 1);
272         pop_ctxt(&save, &new, NULL);
273         if (IS_ERR(d)) {
274                 OBD_FREE_PTR(dev->od_ost_map);
275                 RETURN(PTR_ERR(d));
276         }
277
278         dev->od_ost_map->root = d;
279
280         /* Initialize all groups */
281         for (i = 0; i < MAX_OBJID_GROUP; i++) {
282                 cfs_sema_init(&dev->od_ost_map->groups[i].dir_init_sem, 1);
283                 rc = osd_compat_seq_init(dev, i);
284                 if (rc) {
285                         osd_compat_fini(dev);
286                         break;
287                 }
288         }
289
290         RETURN(rc);
291 }
292
293 int osd_compat_del_entry(struct osd_thread_info *info, struct osd_device *osd,
294                          struct dentry *dird, char *name, struct thandle *th)
295 {
296         struct ldiskfs_dir_entry_2 *de;
297         struct buffer_head         *bh;
298         struct osd_thandle         *oh;
299         struct dentry              *child;
300         struct inode               *dir = dird->d_inode;
301         int                         rc;
302
303         ENTRY;
304
305         oh = container_of(th, struct osd_thandle, ot_super);
306         LASSERT(oh->ot_handle != NULL);
307         LASSERT(oh->ot_handle->h_transaction != NULL);
308
309
310         child = &info->oti_child_dentry;
311         child->d_name.hash = 0;
312         child->d_name.name = name;
313         child->d_name.len = strlen(name);
314         child->d_parent = dird;
315         child->d_inode = NULL;
316
317         mutex_lock(&dir->i_mutex);
318         rc = -ENOENT;
319         bh = osd_ldiskfs_find_entry(dir, child, &de, NULL);
320         if (bh) {
321                 rc = ldiskfs_delete_entry(oh->ot_handle, dir, de, bh);
322                 brelse(bh);
323         }
324         mutex_unlock(&dir->i_mutex);
325
326         RETURN(rc);
327 }
328
329 int osd_compat_add_entry(struct osd_thread_info *info, struct osd_device *osd,
330                          struct dentry *dir, char *name,
331                          const struct osd_inode_id *id, struct thandle *th)
332 {
333         struct osd_thandle *oh;
334         struct dentry *child;
335         struct inode *inode;
336         int rc;
337
338         ENTRY;
339
340         oh = container_of(th, struct osd_thandle, ot_super);
341         LASSERT(oh->ot_handle != NULL);
342         LASSERT(oh->ot_handle->h_transaction != NULL);
343
344         inode = &info->oti_inode;
345         inode->i_sb = osd_sb(osd);
346         osd_id_to_inode(inode, id);
347
348         child = &info->oti_child_dentry;
349         child->d_name.hash = 0;
350         child->d_name.name = name;
351         child->d_name.len = strlen(name);
352         child->d_parent = dir;
353         child->d_inode = inode;
354
355         mutex_lock(&dir->d_inode->i_mutex);
356         rc = osd_ldiskfs_add_entry(oh->ot_handle, child, inode, NULL);
357         mutex_unlock(&dir->d_inode->i_mutex);
358
359         RETURN(rc);
360 }
361
362 int osd_compat_objid_lookup(struct osd_thread_info *info,
363                             struct osd_device *dev, const struct lu_fid *fid,
364                             struct osd_inode_id *id)
365 {
366         struct osd_compat_objid    *map;
367         struct dentry              *d;
368         struct dentry              *d_seq;
369         struct ost_id              *ostid = &info->oti_ostid;
370         int                         dirn;
371         char                        name[32];
372         struct ldiskfs_dir_entry_2 *de;
373         struct buffer_head         *bh;
374         struct inode               *dir;
375         struct inode               *inode;
376         ENTRY;
377
378         /* on the very first lookup we find and open directories */
379
380         map = dev->od_ost_map;
381         LASSERT(map);
382         LASSERT(map->root);
383
384         fid_ostid_pack(fid, ostid);
385         LASSERT(ostid->oi_seq < MAX_OBJID_GROUP);
386         LASSERT(map->subdir_count > 0);
387         LASSERT(map->groups[ostid->oi_seq].groot);
388
389         dirn = ostid->oi_id & (map->subdir_count - 1);
390         d = map->groups[ostid->oi_seq].dirs[dirn];
391         LASSERT(d);
392
393         sprintf(name, "%llu", ostid->oi_id);
394         d_seq = &info->oti_child_dentry;
395         d_seq->d_parent = d;
396         d_seq->d_name.hash = 0;
397         d_seq->d_name.name = name;
398         /* XXX: we can use rc from sprintf() instead of strlen() */
399         d_seq->d_name.len = strlen(name);
400
401         dir = d->d_inode;
402         mutex_lock(&dir->i_mutex);
403         bh = osd_ldiskfs_find_entry(dir, d_seq, &de, NULL);
404         mutex_unlock(&dir->i_mutex);
405
406         if (bh == NULL)
407                 RETURN(-ENOENT);
408
409         osd_id_gen(id, le32_to_cpu(de->inode), OSD_OII_NOGEN);
410         brelse(bh);
411
412         inode = osd_iget(info, dev, id);
413         if (IS_ERR(inode))
414                 RETURN(PTR_ERR(inode));
415
416         iput(inode);
417         RETURN(0);
418 }
419
420 int osd_compat_objid_insert(struct osd_thread_info *info,
421                             struct osd_device *osd,
422                             const struct lu_fid *fid,
423                             const struct osd_inode_id *id,
424                             struct thandle *th)
425 {
426         struct osd_compat_objid *map;
427         struct dentry           *d;
428         struct ost_id           *ostid = &info->oti_ostid;
429         int                      dirn, rc = 0;
430         char                     name[32];
431         ENTRY;
432
433         map = osd->od_ost_map;
434         LASSERT(map);
435         LASSERT(map->root);
436         LASSERT(map->subdir_count > 0);
437         LASSERT(map->groups[ostid->oi_seq].groot);
438
439         /* map fid to group:objid */
440         fid_ostid_pack(fid, ostid);
441         dirn = ostid->oi_id & (map->subdir_count - 1);
442         d = map->groups[ostid->oi_seq].dirs[dirn];
443         LASSERT(d);
444
445         sprintf(name, "%llu", ostid->oi_id);
446         rc = osd_compat_add_entry(info, osd, d, name, id, th);
447
448         RETURN(rc);
449 }
450
451 int osd_compat_objid_delete(struct osd_thread_info *info,
452                             struct osd_device *osd,
453                             const struct lu_fid *fid, struct thandle *th)
454 {
455         struct osd_compat_objid *map;
456         struct dentry           *d;
457         struct ost_id           *ostid = &info->oti_ostid;
458         int                      dirn, rc = 0;
459         char                     name[32];
460         ENTRY;
461
462         map = osd->od_ost_map;
463         LASSERT(map);
464         LASSERT(map->root);
465         LASSERT(map->subdir_count > 0);
466         LASSERT(map->groups[ostid->oi_seq].groot);
467
468         /* map fid to group:objid */
469         fid_ostid_pack(fid, ostid);
470         dirn = ostid->oi_id & (map->subdir_count - 1);
471         d = map->groups[ostid->oi_seq].dirs[dirn];
472         LASSERT(d);
473
474         sprintf(name, "%llu", ostid->oi_id);
475         rc = osd_compat_del_entry(info, osd, d, name, th);
476
477         RETURN(rc);
478 }
479
480 struct named_oid {
481         unsigned long  oid;
482         char          *name;
483 };
484
485 static const struct named_oid oids[] = {
486         { FLD_INDEX_OID,        "" /* "fld" */ },
487         { FID_SEQ_CTL_OID,      "" /* "seq_ctl" */ },
488         { FID_SEQ_SRV_OID,      "" /* "seq_srv" */ },
489         { MDD_ROOT_INDEX_OID,   "" /* "ROOT" */ },
490         { MDD_ORPHAN_OID,       "" /* "PENDING" */ },
491         { MDD_LOV_OBJ_OID,      "" /* LOV_OBJID */ },
492         { MDD_CAPA_KEYS_OID,    "" /* CAPA_KEYS */ },
493         { MDT_LAST_RECV_OID,    LAST_RCVD },
494         { LFSCK_BOOKMARK_OID,   "" /* "lfsck_bookmark" */ },
495         { OTABLE_IT_OID,        "" /* "otable iterator" */},
496         { OFD_LAST_RECV_OID,    "" /* LAST_RCVD */ },
497         { OFD_LAST_GROUP_OID,   "LAST_GROUP" },
498         { LLOG_CATALOGS_OID,    "" /* "CATALOGS" */ },
499         { MGS_CONFIGS_OID,      "" /* MOUNT_CONFIGS_DIR */ },
500         { OFD_HEALTH_CHECK_OID, HEALTH_CHECK },
501         { 0,                    NULL }
502 };
503
504 static char *oid2name(const unsigned long oid)
505 {
506         int i = 0;
507
508         while (oids[i].oid) {
509                 if (oids[i].oid == oid)
510                         return oids[i].name;
511                 i++;
512         }
513         return NULL;
514 }
515
516 int osd_compat_spec_insert(struct osd_thread_info *info,
517                            struct osd_device *osd, const struct lu_fid *fid,
518                            const struct osd_inode_id *id, struct thandle *th)
519 {
520         struct osd_compat_objid *map = osd->od_ost_map;
521         struct dentry           *root = osd_sb(osd)->s_root;
522         char                    *name;
523         int                      rc = 0;
524         int                      seq;
525         ENTRY;
526
527         if (fid_oid(fid) >= OFD_GROUP0_LAST_OID &&
528             fid_oid(fid) < OFD_GROUP4K_LAST_OID) {
529                 /* on creation of LAST_ID we create O/<group> hierarchy */
530                 LASSERT(map);
531                 seq = fid_oid(fid) - OFD_GROUP0_LAST_OID;
532                 LASSERT(seq < MAX_OBJID_GROUP);
533                 LASSERT(map->groups[seq].groot);
534         } else {
535                 name = oid2name(fid_oid(fid));
536                 if (name == NULL)
537                         CWARN("UNKNOWN COMPAT FID "DFID"\n", PFID(fid));
538                 else if (name[0])
539                         rc = osd_compat_add_entry(info, osd, root, name, id,
540                                                   th);
541         }
542
543         RETURN(rc);
544 }
545
546 int osd_compat_spec_lookup(struct osd_thread_info *info,
547                            struct osd_device *osd, const struct lu_fid *fid,
548                            struct osd_inode_id *id)
549 {
550         struct dentry *dentry;
551         struct inode  *inode;
552         char          *name;
553         int            rc = -ENOENT;
554         ENTRY;
555
556         name = oid2name(fid_oid(fid));
557         if (name == NULL || strlen(name) == 0)
558                 RETURN(-ENOENT);
559
560         dentry = ll_lookup_one_len(name, osd_sb(osd)->s_root, strlen(name));
561         if (!IS_ERR(dentry)) {
562                 inode = dentry->d_inode;
563                 if (inode) {
564                         if (is_bad_inode(inode)) {
565                                 rc = -EIO;
566                         } else {
567                                 osd_id_gen(id, inode->i_ino,
568                                            inode->i_generation);
569                                 rc = 0;
570                         }
571                 }
572                 dput(dentry);
573         }
574
575         RETURN(rc);
576 }