Root/fs/ocfs2/quota_local.c

1/*
2 * Implementation of operations over local quota file
3 */
4
5#include <linux/fs.h>
6#include <linux/slab.h>
7#include <linux/quota.h>
8#include <linux/quotaops.h>
9#include <linux/module.h>
10
11#define MLOG_MASK_PREFIX ML_QUOTA
12#include <cluster/masklog.h>
13
14#include "ocfs2_fs.h"
15#include "ocfs2.h"
16#include "inode.h"
17#include "alloc.h"
18#include "file.h"
19#include "buffer_head_io.h"
20#include "journal.h"
21#include "sysfile.h"
22#include "dlmglue.h"
23#include "quota.h"
24#include "uptodate.h"
25
26/* Number of local quota structures per block */
27static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
28{
29    return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
30        sizeof(struct ocfs2_local_disk_dqblk));
31}
32
33/* Number of blocks with entries in one chunk */
34static inline unsigned int ol_chunk_blocks(struct super_block *sb)
35{
36    return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
37         OCFS2_QBLK_RESERVED_SPACE) << 3) /
38           ol_quota_entries_per_block(sb);
39}
40
41/* Number of entries in a chunk bitmap */
42static unsigned int ol_chunk_entries(struct super_block *sb)
43{
44    return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
45}
46
47/* Offset of the chunk in quota file */
48static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
49{
50    /* 1 block for local quota file info, 1 block per chunk for chunk info */
51    return 1 + (ol_chunk_blocks(sb) + 1) * c;
52}
53
54static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
55{
56    int epb = ol_quota_entries_per_block(sb);
57
58    return ol_quota_chunk_block(sb, c) + 1 + off / epb;
59}
60
61static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
62{
63    int epb = ol_quota_entries_per_block(sb);
64
65    return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
66}
67
68/* Offset of the dquot structure in the quota file */
69static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
70{
71    return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
72           ol_dqblk_block_off(sb, c, off);
73}
74
75/* Compute block number from given offset */
76static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
77{
78    return off >> sb->s_blocksize_bits;
79}
80
81static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
82{
83    return off & ((1 << sb->s_blocksize_bits) - 1);
84}
85
86/* Compute offset in the chunk of a structure with the given offset */
87static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
88{
89    int epb = ol_quota_entries_per_block(sb);
90
91    return ((off >> sb->s_blocksize_bits) -
92            ol_quota_chunk_block(sb, c) - 1) * epb
93           + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
94         sizeof(struct ocfs2_local_disk_dqblk);
95}
96
97/* Write bufferhead into the fs */
98static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
99        void (*modify)(struct buffer_head *, void *), void *private)
100{
101    struct super_block *sb = inode->i_sb;
102    handle_t *handle;
103    int status;
104
105    handle = ocfs2_start_trans(OCFS2_SB(sb),
106                   OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
107    if (IS_ERR(handle)) {
108        status = PTR_ERR(handle);
109        mlog_errno(status);
110        return status;
111    }
112    status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
113                     OCFS2_JOURNAL_ACCESS_WRITE);
114    if (status < 0) {
115        mlog_errno(status);
116        ocfs2_commit_trans(OCFS2_SB(sb), handle);
117        return status;
118    }
119    lock_buffer(bh);
120    modify(bh, private);
121    unlock_buffer(bh);
122    status = ocfs2_journal_dirty(handle, bh);
123    if (status < 0) {
124        mlog_errno(status);
125        ocfs2_commit_trans(OCFS2_SB(sb), handle);
126        return status;
127    }
128    status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
129    if (status < 0) {
130        mlog_errno(status);
131        return status;
132    }
133    return 0;
134}
135
136/* Check whether we understand format of quota files */
137static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
138{
139    unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
140    unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
141    unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
142    unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
143    unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
144                    GROUP_QUOTA_SYSTEM_INODE };
145    struct buffer_head *bh = NULL;
146    struct inode *linode = sb_dqopt(sb)->files[type];
147    struct inode *ginode = NULL;
148    struct ocfs2_disk_dqheader *dqhead;
149    int status, ret = 0;
150
151    /* First check whether we understand local quota file */
152    status = ocfs2_read_quota_block(linode, 0, &bh);
153    if (status) {
154        mlog_errno(status);
155        mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
156            type);
157        goto out_err;
158    }
159    dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
160    if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
161        mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
162            " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
163            lmagics[type], type);
164        goto out_err;
165    }
166    if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
167        mlog(ML_ERROR, "quota file version does not match (%u != %u),"
168            " type=%d\n", le32_to_cpu(dqhead->dqh_version),
169            lversions[type], type);
170        goto out_err;
171    }
172    brelse(bh);
173    bh = NULL;
174
175    /* Next check whether we understand global quota file */
176    ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
177                        OCFS2_INVALID_SLOT);
178    if (!ginode) {
179        mlog(ML_ERROR, "cannot get global quota file inode "
180                "(type=%d)\n", type);
181        goto out_err;
182    }
183    /* Since the header is read only, we don't care about locking */
184    status = ocfs2_read_quota_block(ginode, 0, &bh);
185    if (status) {
186        mlog_errno(status);
187        mlog(ML_ERROR, "failed to read global quota file header "
188                "(type=%d)\n", type);
189        goto out_err;
190    }
191    dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
192    if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
193        mlog(ML_ERROR, "global quota file magic does not match "
194            "(%u != %u), type=%d\n",
195            le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
196        goto out_err;
197    }
198    if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
199        mlog(ML_ERROR, "global quota file version does not match "
200            "(%u != %u), type=%d\n",
201            le32_to_cpu(dqhead->dqh_version), gversions[type],
202            type);
203        goto out_err;
204    }
205
206    ret = 1;
207out_err:
208    brelse(bh);
209    iput(ginode);
210    return ret;
211}
212
213/* Release given list of quota file chunks */
214static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
215{
216    struct ocfs2_quota_chunk *pos, *next;
217
218    list_for_each_entry_safe(pos, next, head, qc_chunk) {
219        list_del(&pos->qc_chunk);
220        brelse(pos->qc_headerbh);
221        kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
222    }
223}
224
225/* Load quota bitmaps into memory */
226static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
227            struct ocfs2_local_disk_dqinfo *ldinfo,
228            struct list_head *head)
229{
230    struct ocfs2_quota_chunk *newchunk;
231    int i, status;
232
233    INIT_LIST_HEAD(head);
234    for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
235        newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
236        if (!newchunk) {
237            ocfs2_release_local_quota_bitmaps(head);
238            return -ENOMEM;
239        }
240        newchunk->qc_num = i;
241        newchunk->qc_headerbh = NULL;
242        status = ocfs2_read_quota_block(inode,
243                ol_quota_chunk_block(inode->i_sb, i),
244                &newchunk->qc_headerbh);
245        if (status) {
246            mlog_errno(status);
247            kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
248            ocfs2_release_local_quota_bitmaps(head);
249            return status;
250        }
251        list_add_tail(&newchunk->qc_chunk, head);
252    }
253    return 0;
254}
255
256static void olq_update_info(struct buffer_head *bh, void *private)
257{
258    struct mem_dqinfo *info = private;
259    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
260    struct ocfs2_local_disk_dqinfo *ldinfo;
261
262    ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
263                        OCFS2_LOCAL_INFO_OFF);
264    spin_lock(&dq_data_lock);
265    ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
266    ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
267    ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
268    spin_unlock(&dq_data_lock);
269}
270
271static int ocfs2_add_recovery_chunk(struct super_block *sb,
272                    struct ocfs2_local_disk_chunk *dchunk,
273                    int chunk,
274                    struct list_head *head)
275{
276    struct ocfs2_recovery_chunk *rc;
277
278    rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
279    if (!rc)
280        return -ENOMEM;
281    rc->rc_chunk = chunk;
282    rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
283    if (!rc->rc_bitmap) {
284        kfree(rc);
285        return -ENOMEM;
286    }
287    memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
288           (ol_chunk_entries(sb) + 7) >> 3);
289    list_add_tail(&rc->rc_list, head);
290    return 0;
291}
292
293static void free_recovery_list(struct list_head *head)
294{
295    struct ocfs2_recovery_chunk *next;
296    struct ocfs2_recovery_chunk *rchunk;
297
298    list_for_each_entry_safe(rchunk, next, head, rc_list) {
299        list_del(&rchunk->rc_list);
300        kfree(rchunk->rc_bitmap);
301        kfree(rchunk);
302    }
303}
304
305void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
306{
307    int type;
308
309    for (type = 0; type < MAXQUOTAS; type++)
310        free_recovery_list(&(rec->r_list[type]));
311    kfree(rec);
312}
313
314/* Load entries in our quota file we have to recover*/
315static int ocfs2_recovery_load_quota(struct inode *lqinode,
316                     struct ocfs2_local_disk_dqinfo *ldinfo,
317                     int type,
318                     struct list_head *head)
319{
320    struct super_block *sb = lqinode->i_sb;
321    struct buffer_head *hbh;
322    struct ocfs2_local_disk_chunk *dchunk;
323    int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
324    int status = 0;
325
326    for (i = 0; i < chunks; i++) {
327        hbh = NULL;
328        status = ocfs2_read_quota_block(lqinode,
329                        ol_quota_chunk_block(sb, i),
330                        &hbh);
331        if (status) {
332            mlog_errno(status);
333            break;
334        }
335        dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
336        if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
337            status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
338        brelse(hbh);
339        if (status < 0)
340            break;
341    }
342    if (status < 0)
343        free_recovery_list(head);
344    return status;
345}
346
347static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
348{
349    int type;
350    struct ocfs2_quota_recovery *rec;
351
352    rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
353    if (!rec)
354        return NULL;
355    for (type = 0; type < MAXQUOTAS; type++)
356        INIT_LIST_HEAD(&(rec->r_list[type]));
357    return rec;
358}
359
360/* Load information we need for quota recovery into memory */
361struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
362                        struct ocfs2_super *osb,
363                        int slot_num)
364{
365    unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
366                        OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
367    unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
368                    LOCAL_GROUP_QUOTA_SYSTEM_INODE };
369    struct super_block *sb = osb->sb;
370    struct ocfs2_local_disk_dqinfo *ldinfo;
371    struct inode *lqinode;
372    struct buffer_head *bh;
373    int type;
374    int status = 0;
375    struct ocfs2_quota_recovery *rec;
376
377    mlog(ML_NOTICE, "Beginning quota recovery in slot %u\n", slot_num);
378    rec = ocfs2_alloc_quota_recovery();
379    if (!rec)
380        return ERR_PTR(-ENOMEM);
381    /* First init... */
382
383    for (type = 0; type < MAXQUOTAS; type++) {
384        if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
385            continue;
386        /* At this point, journal of the slot is already replayed so
387         * we can trust metadata and data of the quota file */
388        lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
389        if (!lqinode) {
390            status = -ENOENT;
391            goto out;
392        }
393        status = ocfs2_inode_lock_full(lqinode, NULL, 1,
394                           OCFS2_META_LOCK_RECOVERY);
395        if (status < 0) {
396            mlog_errno(status);
397            goto out_put;
398        }
399        /* Now read local header */
400        bh = NULL;
401        status = ocfs2_read_quota_block(lqinode, 0, &bh);
402        if (status) {
403            mlog_errno(status);
404            mlog(ML_ERROR, "failed to read quota file info header "
405                "(slot=%d type=%d)\n", slot_num, type);
406            goto out_lock;
407        }
408        ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
409                            OCFS2_LOCAL_INFO_OFF);
410        status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
411                           &rec->r_list[type]);
412        brelse(bh);
413out_lock:
414        ocfs2_inode_unlock(lqinode, 1);
415out_put:
416        iput(lqinode);
417        if (status < 0)
418            break;
419    }
420out:
421    if (status < 0) {
422        ocfs2_free_quota_recovery(rec);
423        rec = ERR_PTR(status);
424    }
425    return rec;
426}
427
428/* Sync changes in local quota file into global quota file and
429 * reinitialize local quota file.
430 * The function expects local quota file to be already locked and
431 * dqonoff_mutex locked. */
432static int ocfs2_recover_local_quota_file(struct inode *lqinode,
433                      int type,
434                      struct ocfs2_quota_recovery *rec)
435{
436    struct super_block *sb = lqinode->i_sb;
437    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
438    struct ocfs2_local_disk_chunk *dchunk;
439    struct ocfs2_local_disk_dqblk *dqblk;
440    struct dquot *dquot;
441    handle_t *handle;
442    struct buffer_head *hbh = NULL, *qbh = NULL;
443    int status = 0;
444    int bit, chunk;
445    struct ocfs2_recovery_chunk *rchunk, *next;
446    qsize_t spacechange, inodechange;
447
448    mlog_entry("ino=%lu type=%u", (unsigned long)lqinode->i_ino, type);
449
450    list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
451        chunk = rchunk->rc_chunk;
452        hbh = NULL;
453        status = ocfs2_read_quota_block(lqinode,
454                        ol_quota_chunk_block(sb, chunk),
455                        &hbh);
456        if (status) {
457            mlog_errno(status);
458            break;
459        }
460        dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
461        for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
462            qbh = NULL;
463            status = ocfs2_read_quota_block(lqinode,
464                        ol_dqblk_block(sb, chunk, bit),
465                        &qbh);
466            if (status) {
467                mlog_errno(status);
468                break;
469            }
470            dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
471                ol_dqblk_block_off(sb, chunk, bit));
472            dquot = dqget(sb, le64_to_cpu(dqblk->dqb_id), type);
473            if (!dquot) {
474                status = -EIO;
475                mlog(ML_ERROR, "Failed to get quota structure "
476                     "for id %u, type %d. Cannot finish quota "
477                     "file recovery.\n",
478                     (unsigned)le64_to_cpu(dqblk->dqb_id),
479                     type);
480                goto out_put_bh;
481            }
482            status = ocfs2_lock_global_qf(oinfo, 1);
483            if (status < 0) {
484                mlog_errno(status);
485                goto out_put_dquot;
486            }
487
488            handle = ocfs2_start_trans(OCFS2_SB(sb),
489                           OCFS2_QSYNC_CREDITS);
490            if (IS_ERR(handle)) {
491                status = PTR_ERR(handle);
492                mlog_errno(status);
493                goto out_drop_lock;
494            }
495            mutex_lock(&sb_dqopt(sb)->dqio_mutex);
496            spin_lock(&dq_data_lock);
497            /* Add usage from quota entry into quota changes
498             * of our node. Auxiliary variables are important
499             * due to signedness */
500            spacechange = le64_to_cpu(dqblk->dqb_spacemod);
501            inodechange = le64_to_cpu(dqblk->dqb_inodemod);
502            dquot->dq_dqb.dqb_curspace += spacechange;
503            dquot->dq_dqb.dqb_curinodes += inodechange;
504            spin_unlock(&dq_data_lock);
505            /* We want to drop reference held by the crashed
506             * node. Since we have our own reference we know
507             * global structure actually won't be freed. */
508            status = ocfs2_global_release_dquot(dquot);
509            if (status < 0) {
510                mlog_errno(status);
511                goto out_commit;
512            }
513            /* Release local quota file entry */
514            status = ocfs2_journal_access_dq(handle,
515                    INODE_CACHE(lqinode),
516                    qbh, OCFS2_JOURNAL_ACCESS_WRITE);
517            if (status < 0) {
518                mlog_errno(status);
519                goto out_commit;
520            }
521            lock_buffer(qbh);
522            WARN_ON(!ocfs2_test_bit(bit, dchunk->dqc_bitmap));
523            ocfs2_clear_bit(bit, dchunk->dqc_bitmap);
524            le32_add_cpu(&dchunk->dqc_free, 1);
525            unlock_buffer(qbh);
526            status = ocfs2_journal_dirty(handle, qbh);
527            if (status < 0)
528                mlog_errno(status);
529out_commit:
530            mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
531            ocfs2_commit_trans(OCFS2_SB(sb), handle);
532out_drop_lock:
533            ocfs2_unlock_global_qf(oinfo, 1);
534out_put_dquot:
535            dqput(dquot);
536out_put_bh:
537            brelse(qbh);
538            if (status < 0)
539                break;
540        }
541        brelse(hbh);
542        list_del(&rchunk->rc_list);
543        kfree(rchunk->rc_bitmap);
544        kfree(rchunk);
545        if (status < 0)
546            break;
547    }
548    if (status < 0)
549        free_recovery_list(&(rec->r_list[type]));
550    mlog_exit(status);
551    return status;
552}
553
554/* Recover local quota files for given node different from us */
555int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
556                struct ocfs2_quota_recovery *rec,
557                int slot_num)
558{
559    unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
560                    LOCAL_GROUP_QUOTA_SYSTEM_INODE };
561    struct super_block *sb = osb->sb;
562    struct ocfs2_local_disk_dqinfo *ldinfo;
563    struct buffer_head *bh;
564    handle_t *handle;
565    int type;
566    int status = 0;
567    struct inode *lqinode;
568    unsigned int flags;
569
570    mlog(ML_NOTICE, "Finishing quota recovery in slot %u\n", slot_num);
571    mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
572    for (type = 0; type < MAXQUOTAS; type++) {
573        if (list_empty(&(rec->r_list[type])))
574            continue;
575        mlog(0, "Recovering quota in slot %d\n", slot_num);
576        lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
577        if (!lqinode) {
578            status = -ENOENT;
579            goto out;
580        }
581        status = ocfs2_inode_lock_full(lqinode, NULL, 1,
582                               OCFS2_META_LOCK_NOQUEUE);
583        /* Someone else is holding the lock? Then he must be
584         * doing the recovery. Just skip the file... */
585        if (status == -EAGAIN) {
586            mlog(ML_NOTICE, "skipping quota recovery for slot %d "
587                 "because quota file is locked.\n", slot_num);
588            status = 0;
589            goto out_put;
590        } else if (status < 0) {
591            mlog_errno(status);
592            goto out_put;
593        }
594        /* Now read local header */
595        bh = NULL;
596        status = ocfs2_read_quota_block(lqinode, 0, &bh);
597        if (status) {
598            mlog_errno(status);
599            mlog(ML_ERROR, "failed to read quota file info header "
600                "(slot=%d type=%d)\n", slot_num, type);
601            goto out_lock;
602        }
603        ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
604                            OCFS2_LOCAL_INFO_OFF);
605        /* Is recovery still needed? */
606        flags = le32_to_cpu(ldinfo->dqi_flags);
607        if (!(flags & OLQF_CLEAN))
608            status = ocfs2_recover_local_quota_file(lqinode,
609                                type,
610                                rec);
611        /* We don't want to mark file as clean when it is actually
612         * active */
613        if (slot_num == osb->slot_num)
614            goto out_bh;
615        /* Mark quota file as clean if we are recovering quota file of
616         * some other node. */
617        handle = ocfs2_start_trans(osb,
618                       OCFS2_LOCAL_QINFO_WRITE_CREDITS);
619        if (IS_ERR(handle)) {
620            status = PTR_ERR(handle);
621            mlog_errno(status);
622            goto out_bh;
623        }
624        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
625                         bh,
626                         OCFS2_JOURNAL_ACCESS_WRITE);
627        if (status < 0) {
628            mlog_errno(status);
629            goto out_trans;
630        }
631        lock_buffer(bh);
632        ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
633        unlock_buffer(bh);
634        status = ocfs2_journal_dirty(handle, bh);
635        if (status < 0)
636            mlog_errno(status);
637out_trans:
638        ocfs2_commit_trans(osb, handle);
639out_bh:
640        brelse(bh);
641out_lock:
642        ocfs2_inode_unlock(lqinode, 1);
643out_put:
644        iput(lqinode);
645        if (status < 0)
646            break;
647    }
648out:
649    mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
650    kfree(rec);
651    return status;
652}
653
654/* Read information header from quota file */
655static int ocfs2_local_read_info(struct super_block *sb, int type)
656{
657    struct ocfs2_local_disk_dqinfo *ldinfo;
658    struct mem_dqinfo *info = sb_dqinfo(sb, type);
659    struct ocfs2_mem_dqinfo *oinfo;
660    struct inode *lqinode = sb_dqopt(sb)->files[type];
661    int status;
662    struct buffer_head *bh = NULL;
663    struct ocfs2_quota_recovery *rec;
664    int locked = 0;
665
666    /* We don't need the lock and we have to acquire quota file locks
667     * which will later depend on this lock */
668    mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
669    info->dqi_maxblimit = 0x7fffffffffffffffLL;
670    info->dqi_maxilimit = 0x7fffffffffffffffLL;
671    oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
672    if (!oinfo) {
673        mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
674                   " info.");
675        goto out_err;
676    }
677    info->dqi_priv = oinfo;
678    oinfo->dqi_type = type;
679    INIT_LIST_HEAD(&oinfo->dqi_chunk);
680    oinfo->dqi_rec = NULL;
681    oinfo->dqi_lqi_bh = NULL;
682    oinfo->dqi_ibh = NULL;
683
684    status = ocfs2_global_read_info(sb, type);
685    if (status < 0)
686        goto out_err;
687
688    status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
689    if (status < 0) {
690        mlog_errno(status);
691        goto out_err;
692    }
693    locked = 1;
694
695    /* Now read local header */
696    status = ocfs2_read_quota_block(lqinode, 0, &bh);
697    if (status) {
698        mlog_errno(status);
699        mlog(ML_ERROR, "failed to read quota file info header "
700            "(type=%d)\n", type);
701        goto out_err;
702    }
703    ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
704                        OCFS2_LOCAL_INFO_OFF);
705    info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
706    oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
707    oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
708    oinfo->dqi_ibh = bh;
709
710    /* We crashed when using local quota file? */
711    if (!(info->dqi_flags & OLQF_CLEAN)) {
712        rec = OCFS2_SB(sb)->quota_rec;
713        if (!rec) {
714            rec = ocfs2_alloc_quota_recovery();
715            if (!rec) {
716                status = -ENOMEM;
717                mlog_errno(status);
718                goto out_err;
719            }
720            OCFS2_SB(sb)->quota_rec = rec;
721        }
722
723        status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
724                                                   &rec->r_list[type]);
725        if (status < 0) {
726            mlog_errno(status);
727            goto out_err;
728        }
729    }
730
731    status = ocfs2_load_local_quota_bitmaps(lqinode,
732                        ldinfo,
733                        &oinfo->dqi_chunk);
734    if (status < 0) {
735        mlog_errno(status);
736        goto out_err;
737    }
738
739    /* Now mark quota file as used */
740    info->dqi_flags &= ~OLQF_CLEAN;
741    status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
742    if (status < 0) {
743        mlog_errno(status);
744        goto out_err;
745    }
746
747    mutex_lock(&sb_dqopt(sb)->dqio_mutex);
748    return 0;
749out_err:
750    if (oinfo) {
751        iput(oinfo->dqi_gqinode);
752        ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
753        ocfs2_lock_res_free(&oinfo->dqi_gqlock);
754        brelse(oinfo->dqi_lqi_bh);
755        if (locked)
756            ocfs2_inode_unlock(lqinode, 1);
757        ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
758        kfree(oinfo);
759    }
760    brelse(bh);
761    mutex_lock(&sb_dqopt(sb)->dqio_mutex);
762    return -1;
763}
764
765/* Write local info to quota file */
766static int ocfs2_local_write_info(struct super_block *sb, int type)
767{
768    struct mem_dqinfo *info = sb_dqinfo(sb, type);
769    struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
770                        ->dqi_ibh;
771    int status;
772
773    status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
774                 info);
775    if (status < 0) {
776        mlog_errno(status);
777        return -1;
778    }
779
780    return 0;
781}
782
783/* Release info from memory */
784static int ocfs2_local_free_info(struct super_block *sb, int type)
785{
786    struct mem_dqinfo *info = sb_dqinfo(sb, type);
787    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
788    struct ocfs2_quota_chunk *chunk;
789    struct ocfs2_local_disk_chunk *dchunk;
790    int mark_clean = 1, len;
791    int status;
792
793    /* At this point we know there are no more dquots and thus
794     * even if there's some sync in the pdflush queue, it won't
795     * find any dquots and return without doing anything */
796    cancel_delayed_work_sync(&oinfo->dqi_sync_work);
797    iput(oinfo->dqi_gqinode);
798    ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
799    ocfs2_lock_res_free(&oinfo->dqi_gqlock);
800    list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
801        dchunk = (struct ocfs2_local_disk_chunk *)
802                    (chunk->qc_headerbh->b_data);
803        if (chunk->qc_num < oinfo->dqi_chunks - 1) {
804            len = ol_chunk_entries(sb);
805        } else {
806            len = (oinfo->dqi_blocks -
807                   ol_quota_chunk_block(sb, chunk->qc_num) - 1)
808                  * ol_quota_entries_per_block(sb);
809        }
810        /* Not all entries free? Bug! */
811        if (le32_to_cpu(dchunk->dqc_free) != len) {
812            mlog(ML_ERROR, "releasing quota file with used "
813                    "entries (type=%d)\n", type);
814            mark_clean = 0;
815        }
816    }
817    ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
818
819    /* dqonoff_mutex protects us against racing with recovery thread... */
820    if (oinfo->dqi_rec) {
821        ocfs2_free_quota_recovery(oinfo->dqi_rec);
822        mark_clean = 0;
823    }
824
825    if (!mark_clean)
826        goto out;
827
828    /* Mark local file as clean */
829    info->dqi_flags |= OLQF_CLEAN;
830    status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
831                 oinfo->dqi_ibh,
832                 olq_update_info,
833                 info);
834    if (status < 0) {
835        mlog_errno(status);
836        goto out;
837    }
838
839out:
840    ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
841    brelse(oinfo->dqi_ibh);
842    brelse(oinfo->dqi_lqi_bh);
843    kfree(oinfo);
844    return 0;
845}
846
847static void olq_set_dquot(struct buffer_head *bh, void *private)
848{
849    struct ocfs2_dquot *od = private;
850    struct ocfs2_local_disk_dqblk *dqblk;
851    struct super_block *sb = od->dq_dquot.dq_sb;
852
853    dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
854        + ol_dqblk_block_offset(sb, od->dq_local_off));
855
856    dqblk->dqb_id = cpu_to_le64(od->dq_dquot.dq_id);
857    spin_lock(&dq_data_lock);
858    dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
859                      od->dq_origspace);
860    dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
861                      od->dq_originodes);
862    spin_unlock(&dq_data_lock);
863    mlog(0, "Writing local dquot %u space %lld inodes %lld\n",
864         od->dq_dquot.dq_id, (long long)le64_to_cpu(dqblk->dqb_spacemod),
865         (long long)le64_to_cpu(dqblk->dqb_inodemod));
866}
867
868/* Write dquot to local quota file */
869static int ocfs2_local_write_dquot(struct dquot *dquot)
870{
871    struct super_block *sb = dquot->dq_sb;
872    struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
873    struct buffer_head *bh = NULL;
874    int status;
875
876    status = ocfs2_read_quota_block(sb_dqopt(sb)->files[dquot->dq_type],
877                    ol_dqblk_file_block(sb, od->dq_local_off),
878                    &bh);
879    if (status) {
880        mlog_errno(status);
881        goto out;
882    }
883    status = ocfs2_modify_bh(sb_dqopt(sb)->files[dquot->dq_type], bh,
884                 olq_set_dquot, od);
885    if (status < 0) {
886        mlog_errno(status);
887        goto out;
888    }
889out:
890    brelse(bh);
891    return status;
892}
893
894/* Find free entry in local quota file */
895static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
896                               int type,
897                               int *offset)
898{
899    struct mem_dqinfo *info = sb_dqinfo(sb, type);
900    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
901    struct ocfs2_quota_chunk *chunk;
902    struct ocfs2_local_disk_chunk *dchunk;
903    int found = 0, len;
904
905    list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
906        dchunk = (struct ocfs2_local_disk_chunk *)
907                        chunk->qc_headerbh->b_data;
908        if (le32_to_cpu(dchunk->dqc_free) > 0) {
909            found = 1;
910            break;
911        }
912    }
913    if (!found)
914        return NULL;
915
916    if (chunk->qc_num < oinfo->dqi_chunks - 1) {
917        len = ol_chunk_entries(sb);
918    } else {
919        len = (oinfo->dqi_blocks -
920               ol_quota_chunk_block(sb, chunk->qc_num) - 1)
921              * ol_quota_entries_per_block(sb);
922    }
923
924    found = ocfs2_find_next_zero_bit(dchunk->dqc_bitmap, len, 0);
925    /* We failed? */
926    if (found == len) {
927        mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
928             " entries free (type=%d)\n", chunk->qc_num,
929             le32_to_cpu(dchunk->dqc_free), type);
930        return ERR_PTR(-EIO);
931    }
932    *offset = found;
933    return chunk;
934}
935
936/* Add new chunk to the local quota file */
937static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
938                            struct super_block *sb,
939                            int type,
940                            int *offset)
941{
942    struct mem_dqinfo *info = sb_dqinfo(sb, type);
943    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
944    struct inode *lqinode = sb_dqopt(sb)->files[type];
945    struct ocfs2_quota_chunk *chunk = NULL;
946    struct ocfs2_local_disk_chunk *dchunk;
947    int status;
948    handle_t *handle;
949    struct buffer_head *bh = NULL, *dbh = NULL;
950    u64 p_blkno;
951
952    /* We are protected by dqio_sem so no locking needed */
953    status = ocfs2_extend_no_holes(lqinode,
954                       lqinode->i_size + 2 * sb->s_blocksize,
955                       lqinode->i_size);
956    if (status < 0) {
957        mlog_errno(status);
958        goto out;
959    }
960    status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
961                      lqinode->i_size + 2 * sb->s_blocksize);
962    if (status < 0) {
963        mlog_errno(status);
964        goto out;
965    }
966
967    chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
968    if (!chunk) {
969        status = -ENOMEM;
970        mlog_errno(status);
971        goto out;
972    }
973    /* Local quota info and two new blocks we initialize */
974    handle = ocfs2_start_trans(OCFS2_SB(sb),
975            OCFS2_LOCAL_QINFO_WRITE_CREDITS +
976            2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
977    if (IS_ERR(handle)) {
978        status = PTR_ERR(handle);
979        mlog_errno(status);
980        goto out;
981    }
982
983    /* Initialize chunk header */
984    down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
985    status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
986                         &p_blkno, NULL, NULL);
987    up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
988    if (status < 0) {
989        mlog_errno(status);
990        goto out_trans;
991    }
992    bh = sb_getblk(sb, p_blkno);
993    if (!bh) {
994        status = -ENOMEM;
995        mlog_errno(status);
996        goto out_trans;
997    }
998    dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
999    ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1000    status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1001                     OCFS2_JOURNAL_ACCESS_CREATE);
1002    if (status < 0) {
1003        mlog_errno(status);
1004        goto out_trans;
1005    }
1006    lock_buffer(bh);
1007    dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1008    memset(dchunk->dqc_bitmap, 0,
1009           sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1010           OCFS2_QBLK_RESERVED_SPACE);
1011    unlock_buffer(bh);
1012    status = ocfs2_journal_dirty(handle, bh);
1013    if (status < 0) {
1014        mlog_errno(status);
1015        goto out_trans;
1016    }
1017
1018    /* Initialize new block with structures */
1019    down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1020    status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1021                         &p_blkno, NULL, NULL);
1022    up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1023    if (status < 0) {
1024        mlog_errno(status);
1025        goto out_trans;
1026    }
1027    dbh = sb_getblk(sb, p_blkno);
1028    if (!dbh) {
1029        status = -ENOMEM;
1030        mlog_errno(status);
1031        goto out_trans;
1032    }
1033    ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1034    status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1035                     OCFS2_JOURNAL_ACCESS_CREATE);
1036    if (status < 0) {
1037        mlog_errno(status);
1038        goto out_trans;
1039    }
1040    lock_buffer(dbh);
1041    memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1042    unlock_buffer(dbh);
1043    status = ocfs2_journal_dirty(handle, dbh);
1044    if (status < 0) {
1045        mlog_errno(status);
1046        goto out_trans;
1047    }
1048
1049    /* Update local quotafile info */
1050    oinfo->dqi_blocks += 2;
1051    oinfo->dqi_chunks++;
1052    status = ocfs2_local_write_info(sb, type);
1053    if (status < 0) {
1054        mlog_errno(status);
1055        goto out_trans;
1056    }
1057    status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1058    if (status < 0) {
1059        mlog_errno(status);
1060        goto out;
1061    }
1062
1063    list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1064    chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1065                   struct ocfs2_quota_chunk,
1066                   qc_chunk)->qc_num + 1;
1067    chunk->qc_headerbh = bh;
1068    *offset = 0;
1069    return chunk;
1070out_trans:
1071    ocfs2_commit_trans(OCFS2_SB(sb), handle);
1072out:
1073    brelse(bh);
1074    brelse(dbh);
1075    kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1076    return ERR_PTR(status);
1077}
1078
1079/* Find free entry in local quota file */
1080static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1081                               struct super_block *sb,
1082                               int type,
1083                               int *offset)
1084{
1085    struct mem_dqinfo *info = sb_dqinfo(sb, type);
1086    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1087    struct ocfs2_quota_chunk *chunk;
1088    struct inode *lqinode = sb_dqopt(sb)->files[type];
1089    struct ocfs2_local_disk_chunk *dchunk;
1090    int epb = ol_quota_entries_per_block(sb);
1091    unsigned int chunk_blocks;
1092    struct buffer_head *bh;
1093    u64 p_blkno;
1094    int status;
1095    handle_t *handle;
1096
1097    if (list_empty(&oinfo->dqi_chunk))
1098        return ocfs2_local_quota_add_chunk(sb, type, offset);
1099    /* Is the last chunk full? */
1100    chunk = list_entry(oinfo->dqi_chunk.prev,
1101            struct ocfs2_quota_chunk, qc_chunk);
1102    chunk_blocks = oinfo->dqi_blocks -
1103            ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1104    if (ol_chunk_blocks(sb) == chunk_blocks)
1105        return ocfs2_local_quota_add_chunk(sb, type, offset);
1106
1107    /* We are protected by dqio_sem so no locking needed */
1108    status = ocfs2_extend_no_holes(lqinode,
1109                       lqinode->i_size + sb->s_blocksize,
1110                       lqinode->i_size);
1111    if (status < 0) {
1112        mlog_errno(status);
1113        goto out;
1114    }
1115    status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1116                      lqinode->i_size + sb->s_blocksize);
1117    if (status < 0) {
1118        mlog_errno(status);
1119        goto out;
1120    }
1121
1122    /* Get buffer from the just added block */
1123    down_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1124    status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1125                         &p_blkno, NULL, NULL);
1126    up_read(&OCFS2_I(lqinode)->ip_alloc_sem);
1127    if (status < 0) {
1128        mlog_errno(status);
1129        goto out;
1130    }
1131    bh = sb_getblk(sb, p_blkno);
1132    if (!bh) {
1133        status = -ENOMEM;
1134        mlog_errno(status);
1135        goto out;
1136    }
1137    ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1138
1139    /* Local quota info, chunk header and the new block we initialize */
1140    handle = ocfs2_start_trans(OCFS2_SB(sb),
1141            OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1142            2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1143    if (IS_ERR(handle)) {
1144        status = PTR_ERR(handle);
1145        mlog_errno(status);
1146        goto out;
1147    }
1148    /* Zero created block */
1149    status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1150                 OCFS2_JOURNAL_ACCESS_CREATE);
1151    if (status < 0) {
1152        mlog_errno(status);
1153        goto out_trans;
1154    }
1155    lock_buffer(bh);
1156    memset(bh->b_data, 0, sb->s_blocksize);
1157    unlock_buffer(bh);
1158    status = ocfs2_journal_dirty(handle, bh);
1159    if (status < 0) {
1160        mlog_errno(status);
1161        goto out_trans;
1162    }
1163    /* Update chunk header */
1164    status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1165                     chunk->qc_headerbh,
1166                 OCFS2_JOURNAL_ACCESS_WRITE);
1167    if (status < 0) {
1168        mlog_errno(status);
1169        goto out_trans;
1170    }
1171
1172    dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1173    lock_buffer(chunk->qc_headerbh);
1174    le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1175    unlock_buffer(chunk->qc_headerbh);
1176    status = ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1177    if (status < 0) {
1178        mlog_errno(status);
1179        goto out_trans;
1180    }
1181    /* Update file header */
1182    oinfo->dqi_blocks++;
1183    status = ocfs2_local_write_info(sb, type);
1184    if (status < 0) {
1185        mlog_errno(status);
1186        goto out_trans;
1187    }
1188
1189    status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1190    if (status < 0) {
1191        mlog_errno(status);
1192        goto out;
1193    }
1194    *offset = chunk_blocks * epb;
1195    return chunk;
1196out_trans:
1197    ocfs2_commit_trans(OCFS2_SB(sb), handle);
1198out:
1199    return ERR_PTR(status);
1200}
1201
1202static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1203{
1204    int *offset = private;
1205    struct ocfs2_local_disk_chunk *dchunk;
1206
1207    dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1208    ocfs2_set_bit(*offset, dchunk->dqc_bitmap);
1209    le32_add_cpu(&dchunk->dqc_free, -1);
1210}
1211
1212/* Create dquot in the local file for given id */
1213static int ocfs2_create_local_dquot(struct dquot *dquot)
1214{
1215    struct super_block *sb = dquot->dq_sb;
1216    int type = dquot->dq_type;
1217    struct inode *lqinode = sb_dqopt(sb)->files[type];
1218    struct ocfs2_quota_chunk *chunk;
1219    struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1220    int offset;
1221    int status;
1222
1223    chunk = ocfs2_find_free_entry(sb, type, &offset);
1224    if (!chunk) {
1225        chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1226        if (IS_ERR(chunk))
1227            return PTR_ERR(chunk);
1228    } else if (IS_ERR(chunk)) {
1229        return PTR_ERR(chunk);
1230    }
1231    od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1232    od->dq_chunk = chunk;
1233
1234    /* Initialize dquot structure on disk */
1235    status = ocfs2_local_write_dquot(dquot);
1236    if (status < 0) {
1237        mlog_errno(status);
1238        goto out;
1239    }
1240
1241    /* Mark structure as allocated */
1242    status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1243                 &offset);
1244    if (status < 0) {
1245        mlog_errno(status);
1246        goto out;
1247    }
1248out:
1249    return status;
1250}
1251
1252/* Create entry in local file for dquot, load data from the global file */
1253static int ocfs2_local_read_dquot(struct dquot *dquot)
1254{
1255    int status;
1256
1257    mlog_entry("id=%u, type=%d\n", dquot->dq_id, dquot->dq_type);
1258
1259    status = ocfs2_global_read_dquot(dquot);
1260    if (status < 0) {
1261        mlog_errno(status);
1262        goto out_err;
1263    }
1264
1265    /* Now create entry in the local quota file */
1266    status = ocfs2_create_local_dquot(dquot);
1267    if (status < 0) {
1268        mlog_errno(status);
1269        goto out_err;
1270    }
1271    mlog_exit(0);
1272    return 0;
1273out_err:
1274    mlog_exit(status);
1275    return status;
1276}
1277
1278/* Release dquot structure from local quota file. ocfs2_release_dquot() has
1279 * already started a transaction and obtained exclusive lock for global
1280 * quota file. */
1281static int ocfs2_local_release_dquot(struct dquot *dquot)
1282{
1283    int status;
1284    int type = dquot->dq_type;
1285    struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1286    struct super_block *sb = dquot->dq_sb;
1287    struct ocfs2_local_disk_chunk *dchunk;
1288    int offset;
1289    handle_t *handle = journal_current_handle();
1290
1291    BUG_ON(!handle);
1292    /* First write all local changes to global file */
1293    status = ocfs2_global_release_dquot(dquot);
1294    if (status < 0) {
1295        mlog_errno(status);
1296        goto out;
1297    }
1298
1299    status = ocfs2_journal_access_dq(handle,
1300            INODE_CACHE(sb_dqopt(sb)->files[type]),
1301            od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1302    if (status < 0) {
1303        mlog_errno(status);
1304        goto out;
1305    }
1306    offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1307                         od->dq_local_off);
1308    dchunk = (struct ocfs2_local_disk_chunk *)
1309            (od->dq_chunk->qc_headerbh->b_data);
1310    /* Mark structure as freed */
1311    lock_buffer(od->dq_chunk->qc_headerbh);
1312    ocfs2_clear_bit(offset, dchunk->dqc_bitmap);
1313    le32_add_cpu(&dchunk->dqc_free, 1);
1314    unlock_buffer(od->dq_chunk->qc_headerbh);
1315    status = ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1316    if (status < 0) {
1317        mlog_errno(status);
1318        goto out;
1319    }
1320    status = 0;
1321out:
1322    /* Clear the read bit so that next time someone uses this
1323     * dquot he reads fresh info from disk and allocates local
1324     * dquot structure */
1325    clear_bit(DQ_READ_B, &dquot->dq_flags);
1326    return status;
1327}
1328
1329static const struct quota_format_ops ocfs2_format_ops = {
1330    .check_quota_file = ocfs2_local_check_quota_file,
1331    .read_file_info = ocfs2_local_read_info,
1332    .write_file_info = ocfs2_global_write_info,
1333    .free_file_info = ocfs2_local_free_info,
1334    .read_dqblk = ocfs2_local_read_dquot,
1335    .commit_dqblk = ocfs2_local_write_dquot,
1336    .release_dqblk = ocfs2_local_release_dquot,
1337};
1338
1339struct quota_format_type ocfs2_quota_format = {
1340    .qf_fmt_id = QFMT_OCFS2,
1341    .qf_ops = &ocfs2_format_ops,
1342    .qf_owner = THIS_MODULE
1343};
1344

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