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#include <cluster/masklog.h>
15
16#include "ocfs2_fs.h"
17#include "ocfs2.h"
18#include "alloc.h"
19#include "blockcheck.h"
20#include "inode.h"
21#include "journal.h"
22#include "file.h"
23#include "sysfile.h"
24#include "dlmglue.h"
25#include "uptodate.h"
26#include "super.h"
27#include "buffer_head_io.h"
28#include "quota.h"
29#include "ocfs2_trace.h"
30
31/*
32 * Locking of quotas with OCFS2 is rather complex. Here are rules that
33 * should be obeyed by all the functions:
34 * - any write of quota structure (either to local or global file) is protected
35 * by dqio_mutex or dquot->dq_lock.
36 * - any modification of global quota file holds inode cluster lock, i_mutex,
37 * and ip_alloc_sem of the global quota file (achieved by
38 * ocfs2_lock_global_qf). It also has to hold qinfo_lock.
39 * - an allocation of new blocks for local quota file is protected by
40 * its ip_alloc_sem
41 *
42 * A rough sketch of locking dependencies (lf = local file, gf = global file):
43 * Normal filesystem operation:
44 * start_trans -> dqio_mutex -> write to lf
45 * Syncing of local and global file:
46 * ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
47 * write to gf
48 * -> write to lf
49 * Acquire dquot for the first time:
50 * dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
51 * -> alloc space for gf
52 * -> start_trans -> qinfo_lock -> write to gf
53 * -> ip_alloc_sem of lf -> alloc space for lf
54 * -> write to lf
55 * Release last reference to dquot:
56 * dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
57 * -> write to lf
58 * Note that all the above operations also hold the inode cluster lock of lf.
59 * Recovery:
60 * inode cluster lock of recovered lf
61 * -> read bitmaps -> ip_alloc_sem of lf
62 * -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
63 * write to gf
64 */
65
66static void qsync_work_fn(struct work_struct *work);
67
68static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
69{
70    struct ocfs2_global_disk_dqblk *d = dp;
71    struct mem_dqblk *m = &dquot->dq_dqb;
72
73    /* Update from disk only entries not set by the admin */
74    if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
75        m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
76        m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
77    }
78    if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
79        m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
80    if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
81        m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
82        m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
83    }
84    if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
85        m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
86    if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
87        m->dqb_btime = le64_to_cpu(d->dqb_btime);
88    if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
89        m->dqb_itime = le64_to_cpu(d->dqb_itime);
90    OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
91}
92
93static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
94{
95    struct ocfs2_global_disk_dqblk *d = dp;
96    struct mem_dqblk *m = &dquot->dq_dqb;
97
98    d->dqb_id = cpu_to_le32(dquot->dq_id);
99    d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
100    d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
101    d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
102    d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
103    d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
104    d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
105    d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
106    d->dqb_btime = cpu_to_le64(m->dqb_btime);
107    d->dqb_itime = cpu_to_le64(m->dqb_itime);
108    d->dqb_pad1 = d->dqb_pad2 = 0;
109}
110
111static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
112{
113    struct ocfs2_global_disk_dqblk *d = dp;
114    struct ocfs2_mem_dqinfo *oinfo =
115            sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
116
117    if (qtree_entry_unused(&oinfo->dqi_gi, dp))
118        return 0;
119    return le32_to_cpu(d->dqb_id) == dquot->dq_id;
120}
121
122struct qtree_fmt_operations ocfs2_global_ops = {
123    .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
124    .disk2mem_dqblk = ocfs2_global_disk2memdqb,
125    .is_id = ocfs2_global_is_id,
126};
127
128int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
129{
130    struct ocfs2_disk_dqtrailer *dqt =
131        ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
132
133    trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
134
135    BUG_ON(!buffer_uptodate(bh));
136
137    /*
138     * If the ecc fails, we return the error but otherwise
139     * leave the filesystem running. We know any error is
140     * local to this block.
141     */
142    return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
143}
144
145int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
146                struct buffer_head **bhp)
147{
148    int rc;
149
150    *bhp = NULL;
151    rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
152                   ocfs2_validate_quota_block);
153    if (rc)
154        mlog_errno(rc);
155    return rc;
156}
157
158/* Read data from global quotafile - avoid pagecache and such because we cannot
159 * afford acquiring the locks... We use quota cluster lock to serialize
160 * operations. Caller is responsible for acquiring it. */
161ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
162             size_t len, loff_t off)
163{
164    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
165    struct inode *gqinode = oinfo->dqi_gqinode;
166    loff_t i_size = i_size_read(gqinode);
167    int offset = off & (sb->s_blocksize - 1);
168    sector_t blk = off >> sb->s_blocksize_bits;
169    int err = 0;
170    struct buffer_head *bh;
171    size_t toread, tocopy;
172    u64 pblock = 0, pcount = 0;
173
174    if (off > i_size)
175        return 0;
176    if (off + len > i_size)
177        len = i_size - off;
178    toread = len;
179    while (toread > 0) {
180        tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
181        if (!pcount) {
182            err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
183                              &pcount, NULL);
184            if (err) {
185                mlog_errno(err);
186                return err;
187            }
188        } else {
189            pcount--;
190            pblock++;
191        }
192        bh = NULL;
193        err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
194        if (err) {
195            mlog_errno(err);
196            return err;
197        }
198        memcpy(data, bh->b_data + offset, tocopy);
199        brelse(bh);
200        offset = 0;
201        toread -= tocopy;
202        data += tocopy;
203        blk++;
204    }
205    return len;
206}
207
208/* Write to quotafile (we know the transaction is already started and has
209 * enough credits) */
210ssize_t ocfs2_quota_write(struct super_block *sb, int type,
211              const char *data, size_t len, loff_t off)
212{
213    struct mem_dqinfo *info = sb_dqinfo(sb, type);
214    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
215    struct inode *gqinode = oinfo->dqi_gqinode;
216    int offset = off & (sb->s_blocksize - 1);
217    sector_t blk = off >> sb->s_blocksize_bits;
218    int err = 0, new = 0, ja_type;
219    struct buffer_head *bh = NULL;
220    handle_t *handle = journal_current_handle();
221    u64 pblock, pcount;
222
223    if (!handle) {
224        mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
225             "because transaction was not started.\n",
226             (unsigned long long)off, (unsigned long long)len);
227        return -EIO;
228    }
229    if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
230        WARN_ON(1);
231        len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
232    }
233
234    if (gqinode->i_size < off + len) {
235        loff_t rounded_end =
236                ocfs2_align_bytes_to_blocks(sb, off + len);
237
238        /* Space is already allocated in ocfs2_acquire_dquot() */
239        err = ocfs2_simple_size_update(gqinode,
240                           oinfo->dqi_gqi_bh,
241                           rounded_end);
242        if (err < 0)
243            goto out;
244        new = 1;
245    }
246    err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
247    if (err) {
248        mlog_errno(err);
249        goto out;
250    }
251    /* Not rewriting whole block? */
252    if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
253        !new) {
254        err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
255        ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
256    } else {
257        bh = sb_getblk(sb, pblock);
258        if (!bh)
259            err = -ENOMEM;
260        ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
261    }
262    if (err) {
263        mlog_errno(err);
264        goto out;
265    }
266    lock_buffer(bh);
267    if (new)
268        memset(bh->b_data, 0, sb->s_blocksize);
269    memcpy(bh->b_data + offset, data, len);
270    flush_dcache_page(bh->b_page);
271    set_buffer_uptodate(bh);
272    unlock_buffer(bh);
273    ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
274    err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
275                      ja_type);
276    if (err < 0) {
277        brelse(bh);
278        goto out;
279    }
280    ocfs2_journal_dirty(handle, bh);
281    brelse(bh);
282out:
283    if (err) {
284        mlog_errno(err);
285        return err;
286    }
287    gqinode->i_version++;
288    ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
289    return len;
290}
291
292int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
293{
294    int status;
295    struct buffer_head *bh = NULL;
296
297    status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
298    if (status < 0)
299        return status;
300    spin_lock(&dq_data_lock);
301    if (!oinfo->dqi_gqi_count++)
302        oinfo->dqi_gqi_bh = bh;
303    else
304        WARN_ON(bh != oinfo->dqi_gqi_bh);
305    spin_unlock(&dq_data_lock);
306    if (ex) {
307        mutex_lock(&oinfo->dqi_gqinode->i_mutex);
308        down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
309    } else {
310        down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
311    }
312    return 0;
313}
314
315void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
316{
317    if (ex) {
318        up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
319        mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
320    } else {
321        up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
322    }
323    ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
324    brelse(oinfo->dqi_gqi_bh);
325    spin_lock(&dq_data_lock);
326    if (!--oinfo->dqi_gqi_count)
327        oinfo->dqi_gqi_bh = NULL;
328    spin_unlock(&dq_data_lock);
329}
330
331/* Read information header from global quota file */
332int ocfs2_global_read_info(struct super_block *sb, int type)
333{
334    struct inode *gqinode = NULL;
335    unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
336                    GROUP_QUOTA_SYSTEM_INODE };
337    struct ocfs2_global_disk_dqinfo dinfo;
338    struct mem_dqinfo *info = sb_dqinfo(sb, type);
339    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
340    u64 pcount;
341    int status;
342
343    /* Read global header */
344    gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
345            OCFS2_INVALID_SLOT);
346    if (!gqinode) {
347        mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
348            type);
349        status = -EINVAL;
350        goto out_err;
351    }
352    oinfo->dqi_gi.dqi_sb = sb;
353    oinfo->dqi_gi.dqi_type = type;
354    ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
355    oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
356    oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
357    oinfo->dqi_gqi_bh = NULL;
358    oinfo->dqi_gqi_count = 0;
359    oinfo->dqi_gqinode = gqinode;
360    status = ocfs2_lock_global_qf(oinfo, 0);
361    if (status < 0) {
362        mlog_errno(status);
363        goto out_err;
364    }
365
366    status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
367                         &pcount, NULL);
368    if (status < 0)
369        goto out_unlock;
370
371    status = ocfs2_qinfo_lock(oinfo, 0);
372    if (status < 0)
373        goto out_unlock;
374    status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
375                      sizeof(struct ocfs2_global_disk_dqinfo),
376                      OCFS2_GLOBAL_INFO_OFF);
377    ocfs2_qinfo_unlock(oinfo, 0);
378    ocfs2_unlock_global_qf(oinfo, 0);
379    if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
380        mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
381             status);
382        if (status >= 0)
383            status = -EIO;
384        mlog_errno(status);
385        goto out_err;
386    }
387    info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
388    info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
389    oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
390    oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
391    oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
392    oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
393    oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
394    oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
395                        OCFS2_QBLK_RESERVED_SPACE;
396    oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
397    INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
398    schedule_delayed_work(&oinfo->dqi_sync_work,
399                  msecs_to_jiffies(oinfo->dqi_syncms));
400
401out_err:
402    if (status)
403        mlog_errno(status);
404    return status;
405out_unlock:
406    ocfs2_unlock_global_qf(oinfo, 0);
407    mlog_errno(status);
408    goto out_err;
409}
410
411/* Write information to global quota file. Expects exlusive lock on quota
412 * file inode and quota info */
413static int __ocfs2_global_write_info(struct super_block *sb, int type)
414{
415    struct mem_dqinfo *info = sb_dqinfo(sb, type);
416    struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
417    struct ocfs2_global_disk_dqinfo dinfo;
418    ssize_t size;
419
420    spin_lock(&dq_data_lock);
421    info->dqi_flags &= ~DQF_INFO_DIRTY;
422    dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
423    dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
424    spin_unlock(&dq_data_lock);
425    dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
426    dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
427    dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
428    dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
429    size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
430                     sizeof(struct ocfs2_global_disk_dqinfo),
431                     OCFS2_GLOBAL_INFO_OFF);
432    if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
433        mlog(ML_ERROR, "Cannot write global quota info structure\n");
434        if (size >= 0)
435            size = -EIO;
436        return size;
437    }
438    return 0;
439}
440
441int ocfs2_global_write_info(struct super_block *sb, int type)
442{
443    int err;
444    struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
445
446    err = ocfs2_qinfo_lock(info, 1);
447    if (err < 0)
448        return err;
449    err = __ocfs2_global_write_info(sb, type);
450    ocfs2_qinfo_unlock(info, 1);
451    return err;
452}
453
454static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
455{
456    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
457
458    /*
459     * We may need to allocate tree blocks and a leaf block but not the
460     * root block
461     */
462    return oinfo->dqi_gi.dqi_qtree_depth;
463}
464
465static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
466{
467    /* We modify all the allocated blocks, tree root, info block and
468     * the inode */
469    return (ocfs2_global_qinit_alloc(sb, type) + 2) *
470            OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
471}
472
473/* Sync local information about quota modifications with global quota file.
474 * Caller must have started the transaction and obtained exclusive lock for
475 * global quota file inode */
476int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
477{
478    int err, err2;
479    struct super_block *sb = dquot->dq_sb;
480    int type = dquot->dq_type;
481    struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
482    struct ocfs2_global_disk_dqblk dqblk;
483    s64 spacechange, inodechange;
484    time_t olditime, oldbtime;
485
486    err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
487                   sizeof(struct ocfs2_global_disk_dqblk),
488                   dquot->dq_off);
489    if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
490        if (err >= 0) {
491            mlog(ML_ERROR, "Short read from global quota file "
492                       "(%u read)\n", err);
493            err = -EIO;
494        }
495        goto out;
496    }
497
498    /* Update space and inode usage. Get also other information from
499     * global quota file so that we don't overwrite any changes there.
500     * We are */
501    spin_lock(&dq_data_lock);
502    spacechange = dquot->dq_dqb.dqb_curspace -
503                    OCFS2_DQUOT(dquot)->dq_origspace;
504    inodechange = dquot->dq_dqb.dqb_curinodes -
505                    OCFS2_DQUOT(dquot)->dq_originodes;
506    olditime = dquot->dq_dqb.dqb_itime;
507    oldbtime = dquot->dq_dqb.dqb_btime;
508    ocfs2_global_disk2memdqb(dquot, &dqblk);
509    trace_ocfs2_sync_dquot(dquot->dq_id, dquot->dq_dqb.dqb_curspace,
510                   (long long)spacechange,
511                   dquot->dq_dqb.dqb_curinodes,
512                   (long long)inodechange);
513    if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
514        dquot->dq_dqb.dqb_curspace += spacechange;
515    if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
516        dquot->dq_dqb.dqb_curinodes += inodechange;
517    /* Set properly space grace time... */
518    if (dquot->dq_dqb.dqb_bsoftlimit &&
519        dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
520        if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
521            oldbtime > 0) {
522            if (dquot->dq_dqb.dqb_btime > 0)
523                dquot->dq_dqb.dqb_btime =
524                    min(dquot->dq_dqb.dqb_btime, oldbtime);
525            else
526                dquot->dq_dqb.dqb_btime = oldbtime;
527        }
528    } else {
529        dquot->dq_dqb.dqb_btime = 0;
530        clear_bit(DQ_BLKS_B, &dquot->dq_flags);
531    }
532    /* Set properly inode grace time... */
533    if (dquot->dq_dqb.dqb_isoftlimit &&
534        dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
535        if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
536            olditime > 0) {
537            if (dquot->dq_dqb.dqb_itime > 0)
538                dquot->dq_dqb.dqb_itime =
539                    min(dquot->dq_dqb.dqb_itime, olditime);
540            else
541                dquot->dq_dqb.dqb_itime = olditime;
542        }
543    } else {
544        dquot->dq_dqb.dqb_itime = 0;
545        clear_bit(DQ_INODES_B, &dquot->dq_flags);
546    }
547    /* All information is properly updated, clear the flags */
548    __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
549    __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
550    __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
551    __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
552    __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
553    __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
554    OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
555    OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
556    spin_unlock(&dq_data_lock);
557    err = ocfs2_qinfo_lock(info, freeing);
558    if (err < 0) {
559        mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
560                   " (type=%d, id=%u)\n", dquot->dq_type,
561                   (unsigned)dquot->dq_id);
562        goto out;
563    }
564    if (freeing)
565        OCFS2_DQUOT(dquot)->dq_use_count--;
566    err = qtree_write_dquot(&info->dqi_gi, dquot);
567    if (err < 0)
568        goto out_qlock;
569    if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
570        err = qtree_release_dquot(&info->dqi_gi, dquot);
571        if (info_dirty(sb_dqinfo(sb, type))) {
572            err2 = __ocfs2_global_write_info(sb, type);
573            if (!err)
574                err = err2;
575        }
576    }
577out_qlock:
578    ocfs2_qinfo_unlock(info, freeing);
579out:
580    if (err < 0)
581        mlog_errno(err);
582    return err;
583}
584
585/*
586 * Functions for periodic syncing of dquots with global file
587 */
588static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
589{
590    handle_t *handle;
591    struct super_block *sb = dquot->dq_sb;
592    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
593    struct ocfs2_super *osb = OCFS2_SB(sb);
594    int status = 0;
595
596    trace_ocfs2_sync_dquot_helper(dquot->dq_id, dquot->dq_type,
597                      type, sb->s_id);
598    if (type != dquot->dq_type)
599        goto out;
600    status = ocfs2_lock_global_qf(oinfo, 1);
601    if (status < 0)
602        goto out;
603
604    handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
605    if (IS_ERR(handle)) {
606        status = PTR_ERR(handle);
607        mlog_errno(status);
608        goto out_ilock;
609    }
610    mutex_lock(&sb_dqopt(sb)->dqio_mutex);
611    status = ocfs2_sync_dquot(dquot);
612    if (status < 0)
613        mlog_errno(status);
614    /* We have to write local structure as well... */
615    status = ocfs2_local_write_dquot(dquot);
616    if (status < 0)
617        mlog_errno(status);
618    mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
619    ocfs2_commit_trans(osb, handle);
620out_ilock:
621    ocfs2_unlock_global_qf(oinfo, 1);
622out:
623    return status;
624}
625
626static void qsync_work_fn(struct work_struct *work)
627{
628    struct ocfs2_mem_dqinfo *oinfo = container_of(work,
629                              struct ocfs2_mem_dqinfo,
630                              dqi_sync_work.work);
631    struct super_block *sb = oinfo->dqi_gqinode->i_sb;
632
633    dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
634    schedule_delayed_work(&oinfo->dqi_sync_work,
635                  msecs_to_jiffies(oinfo->dqi_syncms));
636}
637
638/*
639 * Wrappers for generic quota functions
640 */
641
642static int ocfs2_write_dquot(struct dquot *dquot)
643{
644    handle_t *handle;
645    struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
646    int status = 0;
647
648    trace_ocfs2_write_dquot(dquot->dq_id, dquot->dq_type);
649
650    handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
651    if (IS_ERR(handle)) {
652        status = PTR_ERR(handle);
653        mlog_errno(status);
654        goto out;
655    }
656    mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
657    status = ocfs2_local_write_dquot(dquot);
658    mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
659    ocfs2_commit_trans(osb, handle);
660out:
661    return status;
662}
663
664static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
665{
666    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
667    /*
668     * We modify tree, leaf block, global info, local chunk header,
669     * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
670     * accounts for inode update
671     */
672    return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
673           OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
674           OCFS2_QINFO_WRITE_CREDITS +
675           OCFS2_INODE_UPDATE_CREDITS;
676}
677
678static int ocfs2_release_dquot(struct dquot *dquot)
679{
680    handle_t *handle;
681    struct ocfs2_mem_dqinfo *oinfo =
682            sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
683    struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
684    int status = 0;
685
686    trace_ocfs2_release_dquot(dquot->dq_id, dquot->dq_type);
687
688    mutex_lock(&dquot->dq_lock);
689    /* Check whether we are not racing with some other dqget() */
690    if (atomic_read(&dquot->dq_count) > 1)
691        goto out;
692    status = ocfs2_lock_global_qf(oinfo, 1);
693    if (status < 0)
694        goto out;
695    handle = ocfs2_start_trans(osb,
696        ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type));
697    if (IS_ERR(handle)) {
698        status = PTR_ERR(handle);
699        mlog_errno(status);
700        goto out_ilock;
701    }
702
703    status = ocfs2_global_release_dquot(dquot);
704    if (status < 0) {
705        mlog_errno(status);
706        goto out_trans;
707    }
708    status = ocfs2_local_release_dquot(handle, dquot);
709    /*
710     * If we fail here, we cannot do much as global structure is
711     * already released. So just complain...
712     */
713    if (status < 0)
714        mlog_errno(status);
715    clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
716out_trans:
717    ocfs2_commit_trans(osb, handle);
718out_ilock:
719    ocfs2_unlock_global_qf(oinfo, 1);
720out:
721    mutex_unlock(&dquot->dq_lock);
722    if (status)
723        mlog_errno(status);
724    return status;
725}
726
727/*
728 * Read global dquot structure from disk or create it if it does
729 * not exist. Also update use count of the global structure and
730 * create structure in node-local quota file.
731 */
732static int ocfs2_acquire_dquot(struct dquot *dquot)
733{
734    int status = 0, err;
735    int ex = 0;
736    struct super_block *sb = dquot->dq_sb;
737    struct ocfs2_super *osb = OCFS2_SB(sb);
738    int type = dquot->dq_type;
739    struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
740    struct inode *gqinode = info->dqi_gqinode;
741    int need_alloc = ocfs2_global_qinit_alloc(sb, type);
742    handle_t *handle;
743
744    trace_ocfs2_acquire_dquot(dquot->dq_id, type);
745    mutex_lock(&dquot->dq_lock);
746    /*
747     * We need an exclusive lock, because we're going to update use count
748     * and instantiate possibly new dquot structure
749     */
750    status = ocfs2_lock_global_qf(info, 1);
751    if (status < 0)
752        goto out;
753    if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
754        status = ocfs2_qinfo_lock(info, 0);
755        if (status < 0)
756            goto out_dq;
757        status = qtree_read_dquot(&info->dqi_gi, dquot);
758        ocfs2_qinfo_unlock(info, 0);
759        if (status < 0)
760            goto out_dq;
761    }
762    set_bit(DQ_READ_B, &dquot->dq_flags);
763
764    OCFS2_DQUOT(dquot)->dq_use_count++;
765    OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
766    OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
767    if (!dquot->dq_off) { /* No real quota entry? */
768        ex = 1;
769        /*
770         * Add blocks to quota file before we start a transaction since
771         * locking allocators ranks above a transaction start
772         */
773        WARN_ON(journal_current_handle());
774        status = ocfs2_extend_no_holes(gqinode, NULL,
775            gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
776            gqinode->i_size);
777        if (status < 0)
778            goto out_dq;
779    }
780
781    handle = ocfs2_start_trans(osb,
782                   ocfs2_calc_global_qinit_credits(sb, type));
783    if (IS_ERR(handle)) {
784        status = PTR_ERR(handle);
785        goto out_dq;
786    }
787    status = ocfs2_qinfo_lock(info, ex);
788    if (status < 0)
789        goto out_trans;
790    status = qtree_write_dquot(&info->dqi_gi, dquot);
791    if (ex && info_dirty(sb_dqinfo(sb, type))) {
792        err = __ocfs2_global_write_info(sb, type);
793        if (!status)
794            status = err;
795    }
796    ocfs2_qinfo_unlock(info, ex);
797out_trans:
798    ocfs2_commit_trans(osb, handle);
799out_dq:
800    ocfs2_unlock_global_qf(info, 1);
801    if (status < 0)
802        goto out;
803
804    status = ocfs2_create_local_dquot(dquot);
805    if (status < 0)
806        goto out;
807    set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
808out:
809    mutex_unlock(&dquot->dq_lock);
810    if (status)
811        mlog_errno(status);
812    return status;
813}
814
815static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
816{
817    unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
818                 (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
819                 (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
820                 (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
821                 (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
822                 (1 << (DQ_LASTSET_B + QIF_ITIME_B));
823    int sync = 0;
824    int status;
825    struct super_block *sb = dquot->dq_sb;
826    int type = dquot->dq_type;
827    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
828    handle_t *handle;
829    struct ocfs2_super *osb = OCFS2_SB(sb);
830
831    trace_ocfs2_mark_dquot_dirty(dquot->dq_id, type);
832
833    /* In case user set some limits, sync dquot immediately to global
834     * quota file so that information propagates quicker */
835    spin_lock(&dq_data_lock);
836    if (dquot->dq_flags & mask)
837        sync = 1;
838    spin_unlock(&dq_data_lock);
839    /* This is a slight hack but we can't afford getting global quota
840     * lock if we already have a transaction started. */
841    if (!sync || journal_current_handle()) {
842        status = ocfs2_write_dquot(dquot);
843        goto out;
844    }
845    status = ocfs2_lock_global_qf(oinfo, 1);
846    if (status < 0)
847        goto out;
848    handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
849    if (IS_ERR(handle)) {
850        status = PTR_ERR(handle);
851        mlog_errno(status);
852        goto out_ilock;
853    }
854    mutex_lock(&sb_dqopt(sb)->dqio_mutex);
855    status = ocfs2_sync_dquot(dquot);
856    if (status < 0) {
857        mlog_errno(status);
858        goto out_dlock;
859    }
860    /* Now write updated local dquot structure */
861    status = ocfs2_local_write_dquot(dquot);
862out_dlock:
863    mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
864    ocfs2_commit_trans(osb, handle);
865out_ilock:
866    ocfs2_unlock_global_qf(oinfo, 1);
867out:
868    if (status)
869        mlog_errno(status);
870    return status;
871}
872
873/* This should happen only after set_dqinfo(). */
874static int ocfs2_write_info(struct super_block *sb, int type)
875{
876    handle_t *handle;
877    int status = 0;
878    struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
879
880    status = ocfs2_lock_global_qf(oinfo, 1);
881    if (status < 0)
882        goto out;
883    handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
884    if (IS_ERR(handle)) {
885        status = PTR_ERR(handle);
886        mlog_errno(status);
887        goto out_ilock;
888    }
889    status = dquot_commit_info(sb, type);
890    ocfs2_commit_trans(OCFS2_SB(sb), handle);
891out_ilock:
892    ocfs2_unlock_global_qf(oinfo, 1);
893out:
894    if (status)
895        mlog_errno(status);
896    return status;
897}
898
899static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
900{
901    struct ocfs2_dquot *dquot =
902                kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
903
904    if (!dquot)
905        return NULL;
906    return &dquot->dq_dquot;
907}
908
909static void ocfs2_destroy_dquot(struct dquot *dquot)
910{
911    kmem_cache_free(ocfs2_dquot_cachep, dquot);
912}
913
914const struct dquot_operations ocfs2_quota_operations = {
915    /* We never make dquot dirty so .write_dquot is never called */
916    .acquire_dquot = ocfs2_acquire_dquot,
917    .release_dquot = ocfs2_release_dquot,
918    .mark_dirty = ocfs2_mark_dquot_dirty,
919    .write_info = ocfs2_write_info,
920    .alloc_dquot = ocfs2_alloc_dquot,
921    .destroy_dquot = ocfs2_destroy_dquot,
922};
923

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