Root/fs/ocfs2/quota_global.c

1/*
2 * Implementation of operations over global quota file
3 */
4#include <linux/spinlock.h>
5#include <linux/fs.h>
6#include <linux/slab.h>
7#include <linux/quota.h>
8#include <linux/quotaops.h>
9#include <linux/dqblk_qtree.h>
10#include <linux/jiffies.h>
11#include <linux/writeback.h>
12#include <linux/workqueue.h>
13
14#define MLOG_MASK_PREFIX ML_QUOTA
15#include <cluster/masklog.h>
16
17#include "ocfs2_fs.h"
18#include "ocfs2.h"
19#include "alloc.h"
20#include "blockcheck.h"
21#include "inode.h"
22#include "journal.h"
23#include "file.h"
24#include "sysfile.h"
25#include "dlmglue.h"
26#include "uptodate.h"
27#include "super.h"
28#include "quota.h"
29
30static struct workqueue_struct *ocfs2_quota_wq = NULL;
31
32static void qsync_work_fn(struct work_struct *work);
33
34static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
35{
36    struct ocfs2_global_disk_dqblk *d = dp;
37    struct mem_dqblk *m = &dquot->dq_dqb;
38
39    /* Update from disk only entries not set by the admin */
40    if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
41        m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
42        m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
43    }
44    if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
45        m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
46    if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
47        m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
48        m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
49    }
50    if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
51        m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
52    if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
53        m->dqb_btime = le64_to_cpu(d->dqb_btime);
54    if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
55        m->dqb_itime = le64_to_cpu(d->dqb_itime);
56    OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
57}
58
59static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
60{
61    struct ocfs2_global_disk_dqblk *d = dp;
62    struct mem_dqblk *m = &dquot->dq_dqb;
63
64    d->dqb_id = cpu_to_le32(dquot->dq_id);
65    d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
66    d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
67    d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
68    d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
69    d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
70    d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
71    d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
72    d->dqb_btime = cpu_to_le64(m->dqb_btime);
73    d->dqb_itime = cpu_to_le64(m->dqb_itime);
74    d->dqb_pad1 = d->dqb_pad2 = 0;
75}
76
77static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
78{
79    struct ocfs2_global_disk_dqblk *d = dp;
80    struct ocfs2_mem_dqinfo *oinfo =
81            sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
82
83    if (qtree_entry_unused(&oinfo->dqi_gi, dp))
84        return 0;
85    return le32_to_cpu(d->dqb_id) == dquot->dq_id;
86}
87
88struct qtree_fmt_operations ocfs2_global_ops = {
89    .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
90    .disk2mem_dqblk = ocfs2_global_disk2memdqb,
91    .is_id = ocfs2_global_is_id,
92};
93
94static int ocfs2_validate_quota_block(struct super_block *sb,
95                      struct buffer_head *bh)
96{
97    struct ocfs2_disk_dqtrailer *dqt =
98        ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
99
100    mlog(0, "Validating quota block %llu\n",
101         (unsigned long long)bh->b_blocknr);
102
103    BUG_ON(!buffer_uptodate(bh));
104
105    /*
106     * If the ecc fails, we return the error but otherwise
107     * leave the filesystem running. We know any error is
108     * local to this block.
109     */
110    return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
111}
112
113int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
114               struct buffer_head **bh)
115{
116    int rc = 0;
117    struct buffer_head *tmp = *bh;
118
119    if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
120        ocfs2_error(inode->i_sb,
121                "Quota file %llu is probably corrupted! Requested "
122                "to read block %Lu but file has size only %Lu\n",
123                (unsigned long long)OCFS2_I(inode)->ip_blkno,
124                (unsigned long long)v_block,
125                (unsigned long long)i_size_read(inode));
126        return -EIO;
127    }
128    rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
129                    ocfs2_validate_quota_block);
130    if (rc)
131        mlog_errno(rc);
132
133    /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
134    if (!rc && !*bh)
135        *bh = tmp;
136
137    return rc;
138}
139
140static int ocfs2_get_quota_block(struct inode *inode, int block,
141                 struct buffer_head **bh)
142{
143    u64 pblock, pcount;
144    int err;
145
146    down_read(&OCFS2_I(inode)->ip_alloc_sem);
147    err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, NULL);
148    up_read(&OCFS2_I(inode)->ip_alloc_sem);
149    if (err) {
150        mlog_errno(err);
151        return err;
152    }
153    *bh = sb_getblk(inode->i_sb, pblock);
154    if (!*bh) {
155        err = -EIO;
156        mlog_errno(err);
157    }
158    return err;
159}
160
161/* Read data from global quotafile - avoid pagecache and such because we cannot
162 * afford acquiring the locks... We use quota cluster lock to serialize
163 * operations. Caller is responsible for acquiring it. */
164ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
165             size_t len, loff_t off)
166{
167    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
168    struct inode *gqinode = oinfo->dqi_gqinode;
169    loff_t i_size = i_size_read(gqinode);
170    int offset = off & (sb->s_blocksize - 1);
171    sector_t blk = off >> sb->s_blocksize_bits;
172    int err = 0;
173    struct buffer_head *bh;
174    size_t toread, tocopy;
175
176    if (off > i_size)
177        return 0;
178    if (off + len > i_size)
179        len = i_size - off;
180    toread = len;
181    while (toread > 0) {
182        tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
183        bh = NULL;
184        err = ocfs2_read_quota_block(gqinode, blk, &bh);
185        if (err) {
186            mlog_errno(err);
187            return err;
188        }
189        memcpy(data, bh->b_data + offset, tocopy);
190        brelse(bh);
191        offset = 0;
192        toread -= tocopy;
193        data += tocopy;
194        blk++;
195    }
196    return len;
197}
198
199/* Write to quotafile (we know the transaction is already started and has
200 * enough credits) */
201ssize_t ocfs2_quota_write(struct super_block *sb, int type,
202              const char *data, size_t len, loff_t off)
203{
204    struct mem_dqinfo *info = sb_dqinfo(sb, type);
205    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
206    struct inode *gqinode = oinfo->dqi_gqinode;
207    int offset = off & (sb->s_blocksize - 1);
208    sector_t blk = off >> sb->s_blocksize_bits;
209    int err = 0, new = 0, ja_type;
210    struct buffer_head *bh = NULL;
211    handle_t *handle = journal_current_handle();
212
213    if (!handle) {
214        mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
215             "because transaction was not started.\n",
216             (unsigned long long)off, (unsigned long long)len);
217        return -EIO;
218    }
219    if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
220        WARN_ON(1);
221        len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
222    }
223
224    mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA);
225    if (gqinode->i_size < off + len) {
226        loff_t rounded_end =
227                ocfs2_align_bytes_to_blocks(sb, off + len);
228
229        /* Space is already allocated in ocfs2_global_read_dquot() */
230        err = ocfs2_simple_size_update(gqinode,
231                           oinfo->dqi_gqi_bh,
232                           rounded_end);
233        if (err < 0)
234            goto out;
235        new = 1;
236    }
237    /* Not rewriting whole block? */
238    if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
239        !new) {
240        err = ocfs2_read_quota_block(gqinode, blk, &bh);
241        ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
242    } else {
243        err = ocfs2_get_quota_block(gqinode, blk, &bh);
244        ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
245    }
246    if (err) {
247        mlog_errno(err);
248        goto out;
249    }
250    lock_buffer(bh);
251    if (new)
252        memset(bh->b_data, 0, sb->s_blocksize);
253    memcpy(bh->b_data + offset, data, len);
254    flush_dcache_page(bh->b_page);
255    set_buffer_uptodate(bh);
256    unlock_buffer(bh);
257    ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
258    err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
259                      ja_type);
260    if (err < 0) {
261        brelse(bh);
262        goto out;
263    }
264    err = ocfs2_journal_dirty(handle, bh);
265    brelse(bh);
266    if (err < 0)
267        goto out;
268out:
269    if (err) {
270        mutex_unlock(&gqinode->i_mutex);
271        mlog_errno(err);
272        return err;
273    }
274    gqinode->i_version++;
275    ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
276    mutex_unlock(&gqinode->i_mutex);
277    return len;
278}
279
280int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
281{
282    int status;
283    struct buffer_head *bh = NULL;
284
285    status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
286    if (status < 0)
287        return status;
288    spin_lock(&dq_data_lock);
289    if (!oinfo->dqi_gqi_count++)
290        oinfo->dqi_gqi_bh = bh;
291    else
292        WARN_ON(bh != oinfo->dqi_gqi_bh);
293    spin_unlock(&dq_data_lock);
294    return 0;
295}
296
297void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
298{
299    ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
300    brelse(oinfo->dqi_gqi_bh);
301    spin_lock(&dq_data_lock);
302    if (!--oinfo->dqi_gqi_count)
303        oinfo->dqi_gqi_bh = NULL;
304    spin_unlock(&dq_data_lock);
305}
306
307/* Read information header from global quota file */
308int ocfs2_global_read_info(struct super_block *sb, int type)
309{
310    struct inode *gqinode = NULL;
311    unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
312                    GROUP_QUOTA_SYSTEM_INODE };
313    struct ocfs2_global_disk_dqinfo dinfo;
314    struct mem_dqinfo *info = sb_dqinfo(sb, type);
315    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
316    int status;
317
318    mlog_entry_void();
319
320    /* Read global header */
321    gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
322            OCFS2_INVALID_SLOT);
323    if (!gqinode) {
324        mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
325            type);
326        status = -EINVAL;
327        goto out_err;
328    }
329    oinfo->dqi_gi.dqi_sb = sb;
330    oinfo->dqi_gi.dqi_type = type;
331    ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
332    oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
333    oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
334    oinfo->dqi_gqi_bh = NULL;
335    oinfo->dqi_gqi_count = 0;
336    oinfo->dqi_gqinode = gqinode;
337    status = ocfs2_lock_global_qf(oinfo, 0);
338    if (status < 0) {
339        mlog_errno(status);
340        goto out_err;
341    }
342    status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
343                      sizeof(struct ocfs2_global_disk_dqinfo),
344                      OCFS2_GLOBAL_INFO_OFF);
345    ocfs2_unlock_global_qf(oinfo, 0);
346    if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
347        mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
348             status);
349        if (status >= 0)
350            status = -EIO;
351        mlog_errno(status);
352        goto out_err;
353    }
354    info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
355    info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
356    oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
357    oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
358    oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
359    oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
360    oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
361    oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
362                        OCFS2_QBLK_RESERVED_SPACE;
363    oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
364    INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
365    queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
366               msecs_to_jiffies(oinfo->dqi_syncms));
367
368out_err:
369    mlog_exit(status);
370    return status;
371}
372
373/* Write information to global quota file. Expects exlusive lock on quota
374 * file inode and quota info */
375static int __ocfs2_global_write_info(struct super_block *sb, int type)
376{
377    struct mem_dqinfo *info = sb_dqinfo(sb, type);
378    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
379    struct ocfs2_global_disk_dqinfo dinfo;
380    ssize_t size;
381
382    spin_lock(&dq_data_lock);
383    info->dqi_flags &= ~DQF_INFO_DIRTY;
384    dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
385    dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
386    spin_unlock(&dq_data_lock);
387    dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
388    dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
389    dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
390    dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
391    size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
392                     sizeof(struct ocfs2_global_disk_dqinfo),
393                     OCFS2_GLOBAL_INFO_OFF);
394    if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
395        mlog(ML_ERROR, "Cannot write global quota info structure\n");
396        if (size >= 0)
397            size = -EIO;
398        return size;
399    }
400    return 0;
401}
402
403int ocfs2_global_write_info(struct super_block *sb, int type)
404{
405    int err;
406    struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
407
408    err = ocfs2_qinfo_lock(info, 1);
409    if (err < 0)
410        return err;
411    err = __ocfs2_global_write_info(sb, type);
412    ocfs2_qinfo_unlock(info, 1);
413    return err;
414}
415
416static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
417{
418    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
419
420    /*
421     * We may need to allocate tree blocks and a leaf block but not the
422     * root block
423     */
424    return oinfo->dqi_gi.dqi_qtree_depth;
425}
426
427static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
428{
429    /* We modify all the allocated blocks, tree root, and info block */
430    return (ocfs2_global_qinit_alloc(sb, type) + 2) *
431            OCFS2_QUOTA_BLOCK_UPDATE_CREDITS;
432}
433
434/* Read in information from global quota file and acquire a reference to it.
435 * dquot_acquire() has already started the transaction and locked quota file */
436int ocfs2_global_read_dquot(struct dquot *dquot)
437{
438    int err, err2, ex = 0;
439    struct super_block *sb = dquot->dq_sb;
440    int type = dquot->dq_type;
441    struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
442    struct ocfs2_super *osb = OCFS2_SB(sb);
443    struct inode *gqinode = info->dqi_gqinode;
444    int need_alloc = ocfs2_global_qinit_alloc(sb, type);
445    handle_t *handle = NULL;
446
447    err = ocfs2_qinfo_lock(info, 0);
448    if (err < 0)
449        goto out;
450    err = qtree_read_dquot(&info->dqi_gi, dquot);
451    if (err < 0)
452        goto out_qlock;
453    OCFS2_DQUOT(dquot)->dq_use_count++;
454    OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
455    OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
456    ocfs2_qinfo_unlock(info, 0);
457
458    if (!dquot->dq_off) { /* No real quota entry? */
459        ex = 1;
460        /*
461         * Add blocks to quota file before we start a transaction since
462         * locking allocators ranks above a transaction start
463         */
464        WARN_ON(journal_current_handle());
465        down_write(&OCFS2_I(gqinode)->ip_alloc_sem);
466        err = ocfs2_extend_no_holes(gqinode,
467            gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
468            gqinode->i_size);
469        up_write(&OCFS2_I(gqinode)->ip_alloc_sem);
470        if (err < 0)
471            goto out;
472    }
473
474    handle = ocfs2_start_trans(osb,
475                   ocfs2_calc_global_qinit_credits(sb, type));
476    if (IS_ERR(handle)) {
477        err = PTR_ERR(handle);
478        goto out;
479    }
480    err = ocfs2_qinfo_lock(info, ex);
481    if (err < 0)
482        goto out_trans;
483    err = qtree_write_dquot(&info->dqi_gi, dquot);
484    if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) {
485        err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type);
486        if (!err)
487            err = err2;
488    }
489out_qlock:
490    if (ex)
491        ocfs2_qinfo_unlock(info, 1);
492    else
493        ocfs2_qinfo_unlock(info, 0);
494out_trans:
495    if (handle)
496        ocfs2_commit_trans(osb, handle);
497out:
498    if (err < 0)
499        mlog_errno(err);
500    return err;
501}
502
503/* Sync local information about quota modifications with global quota file.
504 * Caller must have started the transaction and obtained exclusive lock for
505 * global quota file inode */
506int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
507{
508    int err, err2;
509    struct super_block *sb = dquot->dq_sb;
510    int type = dquot->dq_type;
511    struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
512    struct ocfs2_global_disk_dqblk dqblk;
513    s64 spacechange, inodechange;
514    time_t olditime, oldbtime;
515
516    err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
517                   sizeof(struct ocfs2_global_disk_dqblk),
518                   dquot->dq_off);
519    if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
520        if (err >= 0) {
521            mlog(ML_ERROR, "Short read from global quota file "
522                       "(%u read)\n", err);
523            err = -EIO;
524        }
525        goto out;
526    }
527
528    /* Update space and inode usage. Get also other information from
529     * global quota file so that we don't overwrite any changes there.
530     * We are */
531    spin_lock(&dq_data_lock);
532    spacechange = dquot->dq_dqb.dqb_curspace -
533                    OCFS2_DQUOT(dquot)->dq_origspace;
534    inodechange = dquot->dq_dqb.dqb_curinodes -
535                    OCFS2_DQUOT(dquot)->dq_originodes;
536    olditime = dquot->dq_dqb.dqb_itime;
537    oldbtime = dquot->dq_dqb.dqb_btime;
538    ocfs2_global_disk2memdqb(dquot, &dqblk);
539    mlog(0, "Syncing global dquot %u space %lld+%lld, inodes %lld+%lld\n",
540         dquot->dq_id, dquot->dq_dqb.dqb_curspace, (long long)spacechange,
541         dquot->dq_dqb.dqb_curinodes, (long long)inodechange);
542    if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
543        dquot->dq_dqb.dqb_curspace += spacechange;
544    if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
545        dquot->dq_dqb.dqb_curinodes += inodechange;
546    /* Set properly space grace time... */
547    if (dquot->dq_dqb.dqb_bsoftlimit &&
548        dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
549        if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
550            oldbtime > 0) {
551            if (dquot->dq_dqb.dqb_btime > 0)
552                dquot->dq_dqb.dqb_btime =
553                    min(dquot->dq_dqb.dqb_btime, oldbtime);
554            else
555                dquot->dq_dqb.dqb_btime = oldbtime;
556        }
557    } else {
558        dquot->dq_dqb.dqb_btime = 0;
559        clear_bit(DQ_BLKS_B, &dquot->dq_flags);
560    }
561    /* Set properly inode grace time... */
562    if (dquot->dq_dqb.dqb_isoftlimit &&
563        dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
564        if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
565            olditime > 0) {
566            if (dquot->dq_dqb.dqb_itime > 0)
567                dquot->dq_dqb.dqb_itime =
568                    min(dquot->dq_dqb.dqb_itime, olditime);
569            else
570                dquot->dq_dqb.dqb_itime = olditime;
571        }
572    } else {
573        dquot->dq_dqb.dqb_itime = 0;
574        clear_bit(DQ_INODES_B, &dquot->dq_flags);
575    }
576    /* All information is properly updated, clear the flags */
577    __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
578    __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
579    __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
580    __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
581    __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
582    __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
583    OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
584    OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
585    spin_unlock(&dq_data_lock);
586    err = ocfs2_qinfo_lock(info, freeing);
587    if (err < 0) {
588        mlog(ML_ERROR, "Failed to lock quota info, loosing quota write"
589                   " (type=%d, id=%u)\n", dquot->dq_type,
590                   (unsigned)dquot->dq_id);
591        goto out;
592    }
593    if (freeing)
594        OCFS2_DQUOT(dquot)->dq_use_count--;
595    err = qtree_write_dquot(&info->dqi_gi, dquot);
596    if (err < 0)
597        goto out_qlock;
598    if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
599        err = qtree_release_dquot(&info->dqi_gi, dquot);
600        if (info_dirty(sb_dqinfo(sb, type))) {
601            err2 = __ocfs2_global_write_info(sb, type);
602            if (!err)
603                err = err2;
604        }
605    }
606out_qlock:
607    ocfs2_qinfo_unlock(info, freeing);
608out:
609    if (err < 0)
610        mlog_errno(err);
611    return err;
612}
613
614/*
615 * Functions for periodic syncing of dquots with global file
616 */
617static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
618{
619    handle_t *handle;
620    struct super_block *sb = dquot->dq_sb;
621    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
622    struct ocfs2_super *osb = OCFS2_SB(sb);
623    int status = 0;
624
625    mlog_entry("id=%u qtype=%u type=%lu device=%s\n", dquot->dq_id,
626           dquot->dq_type, type, sb->s_id);
627    if (type != dquot->dq_type)
628        goto out;
629    status = ocfs2_lock_global_qf(oinfo, 1);
630    if (status < 0)
631        goto out;
632
633    handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
634    if (IS_ERR(handle)) {
635        status = PTR_ERR(handle);
636        mlog_errno(status);
637        goto out_ilock;
638    }
639    mutex_lock(&sb_dqopt(sb)->dqio_mutex);
640    status = ocfs2_sync_dquot(dquot);
641    mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
642    if (status < 0)
643        mlog_errno(status);
644    /* We have to write local structure as well... */
645    dquot_mark_dquot_dirty(dquot);
646    status = dquot_commit(dquot);
647    if (status < 0)
648        mlog_errno(status);
649    ocfs2_commit_trans(osb, handle);
650out_ilock:
651    ocfs2_unlock_global_qf(oinfo, 1);
652out:
653    mlog_exit(status);
654    return status;
655}
656
657static void qsync_work_fn(struct work_struct *work)
658{
659    struct ocfs2_mem_dqinfo *oinfo = container_of(work,
660                              struct ocfs2_mem_dqinfo,
661                              dqi_sync_work.work);
662    struct super_block *sb = oinfo->dqi_gqinode->i_sb;
663
664    dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
665    queue_delayed_work(ocfs2_quota_wq, &oinfo->dqi_sync_work,
666               msecs_to_jiffies(oinfo->dqi_syncms));
667}
668
669/*
670 * Wrappers for generic quota functions
671 */
672
673static int ocfs2_write_dquot(struct dquot *dquot)
674{
675    handle_t *handle;
676    struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
677    int status = 0;
678
679    mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
680
681    handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
682    if (IS_ERR(handle)) {
683        status = PTR_ERR(handle);
684        mlog_errno(status);
685        goto out;
686    }
687    status = dquot_commit(dquot);
688    ocfs2_commit_trans(osb, handle);
689out:
690    mlog_exit(status);
691    return status;
692}
693
694static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
695{
696    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
697    /*
698     * We modify tree, leaf block, global info, local chunk header,
699     * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
700     * accounts for inode update
701     */
702    return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
703           OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
704           OCFS2_QINFO_WRITE_CREDITS +
705           OCFS2_INODE_UPDATE_CREDITS;
706}
707
708static int ocfs2_release_dquot(struct dquot *dquot)
709{
710    handle_t *handle;
711    struct ocfs2_mem_dqinfo *oinfo =
712            sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
713    struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
714    int status = 0;
715
716    mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
717
718    status = ocfs2_lock_global_qf(oinfo, 1);
719    if (status < 0)
720        goto out;
721    handle = ocfs2_start_trans(osb,
722        ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
723    if (IS_ERR(handle)) {
724        status = PTR_ERR(handle);
725        mlog_errno(status);
726        goto out_ilock;
727    }
728    status = dquot_release(dquot);
729    ocfs2_commit_trans(osb, handle);
730out_ilock:
731    ocfs2_unlock_global_qf(oinfo, 1);
732out:
733    mlog_exit(status);
734    return status;
735}
736
737static int ocfs2_acquire_dquot(struct dquot *dquot)
738{
739    struct ocfs2_mem_dqinfo *oinfo =
740            sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
741    int status = 0;
742
743    mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type);
744    /* We need an exclusive lock, because we're going to update use count
745     * and instantiate possibly new dquot structure */
746    status = ocfs2_lock_global_qf(oinfo, 1);
747    if (status < 0)
748        goto out;
749    status = dquot_acquire(dquot);
750    ocfs2_unlock_global_qf(oinfo, 1);
751out:
752    mlog_exit(status);
753    return status;
754}
755
756static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
757{
758    unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
759                 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
760                 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
761                 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
762                 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
763                 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
764    int sync = 0;
765    int status;
766    struct super_block *sb = dquot->dq_sb;
767    int type = dquot->dq_type;
768    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
769    handle_t *handle;
770    struct ocfs2_super *osb = OCFS2_SB(sb);
771
772    mlog_entry("id=%u, type=%d", dquot->dq_id, type);
773    dquot_mark_dquot_dirty(dquot);
774
775    /* In case user set some limits, sync dquot immediately to global
776     * quota file so that information propagates quicker */
777    spin_lock(&dq_data_lock);
778    if (dquot->dq_flags & mask)
779        sync = 1;
780    spin_unlock(&dq_data_lock);
781    /* This is a slight hack but we can't afford getting global quota
782     * lock if we already have a transaction started. */
783    if (!sync || journal_current_handle()) {
784        status = ocfs2_write_dquot(dquot);
785        goto out;
786    }
787    status = ocfs2_lock_global_qf(oinfo, 1);
788    if (status < 0)
789        goto out;
790    handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
791    if (IS_ERR(handle)) {
792        status = PTR_ERR(handle);
793        mlog_errno(status);
794        goto out_ilock;
795    }
796    status = ocfs2_sync_dquot(dquot);
797    if (status < 0) {
798        mlog_errno(status);
799        goto out_trans;
800    }
801    /* Now write updated local dquot structure */
802    status = dquot_commit(dquot);
803out_trans:
804    ocfs2_commit_trans(osb, handle);
805out_ilock:
806    ocfs2_unlock_global_qf(oinfo, 1);
807out:
808    mlog_exit(status);
809    return status;
810}
811
812/* This should happen only after set_dqinfo(). */
813static int ocfs2_write_info(struct super_block *sb, int type)
814{
815    handle_t *handle;
816    int status = 0;
817    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
818
819    mlog_entry_void();
820
821    status = ocfs2_lock_global_qf(oinfo, 1);
822    if (status < 0)
823        goto out;
824    handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
825    if (IS_ERR(handle)) {
826        status = PTR_ERR(handle);
827        mlog_errno(status);
828        goto out_ilock;
829    }
830    status = dquot_commit_info(sb, type);
831    ocfs2_commit_trans(OCFS2_SB(sb), handle);
832out_ilock:
833    ocfs2_unlock_global_qf(oinfo, 1);
834out:
835    mlog_exit(status);
836    return status;
837}
838
839static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
840{
841    struct ocfs2_dquot *dquot =
842                kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
843
844    if (!dquot)
845        return NULL;
846    return &dquot->dq_dquot;
847}
848
849static void ocfs2_destroy_dquot(struct dquot *dquot)
850{
851    kmem_cache_free(ocfs2_dquot_cachep, dquot);
852}
853
854const struct dquot_operations ocfs2_quota_operations = {
855    .write_dquot = ocfs2_write_dquot,
856    .acquire_dquot = ocfs2_acquire_dquot,
857    .release_dquot = ocfs2_release_dquot,
858    .mark_dirty = ocfs2_mark_dquot_dirty,
859    .write_info = ocfs2_write_info,
860    .alloc_dquot = ocfs2_alloc_dquot,
861    .destroy_dquot = ocfs2_destroy_dquot,
862};
863
864int ocfs2_quota_setup(void)
865{
866    ocfs2_quota_wq = create_workqueue("o2quot");
867    if (!ocfs2_quota_wq)
868        return -ENOMEM;
869    return 0;
870}
871
872void ocfs2_quota_shutdown(void)
873{
874    if (ocfs2_quota_wq) {
875        flush_workqueue(ocfs2_quota_wq);
876        destroy_workqueue(ocfs2_quota_wq);
877        ocfs2_quota_wq = NULL;
878    }
879}
880

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