blob: ca71bf881ad1e33d11c1fdd10b71070c5079358d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * vfsv0 quota IO operations on file
3 */
4
5#include <linux/errno.h>
6#include <linux/fs.h>
7#include <linux/mount.h>
8#include <linux/dqblk_v2.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/slab.h>
Jan Kara74abb982008-07-25 01:46:51 -070013#include <linux/quotaops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#include <asm/byteorder.h>
16
Jan Kara1ccd14b2008-09-22 05:54:49 +020017#include "quota_tree.h"
Jan Karacf770c12008-09-21 23:17:53 +020018#include "quotaio_v2.h"
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020MODULE_AUTHOR("Jan Kara");
21MODULE_DESCRIPTION("Quota format v2 support");
22MODULE_LICENSE("GPL");
23
24#define __QUOTA_V2_PARANOIA
25
Jan Kara498c6012009-11-16 18:09:47 +010026static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot);
27static void v2r0_disk2memdqb(struct dquot *dquot, void *dp);
28static int v2r0_is_id(void *dp, struct dquot *dquot);
29static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot);
30static void v2r1_disk2memdqb(struct dquot *dquot, void *dp);
31static int v2r1_is_id(void *dp, struct dquot *dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Julia Lawalld1b98c22016-01-01 08:53:37 +010033static const struct qtree_fmt_operations v2r0_qtree_ops = {
Jan Kara498c6012009-11-16 18:09:47 +010034 .mem2disk_dqblk = v2r0_mem2diskdqb,
35 .disk2mem_dqblk = v2r0_disk2memdqb,
36 .is_id = v2r0_is_id,
37};
38
Julia Lawalld1b98c22016-01-01 08:53:37 +010039static const struct qtree_fmt_operations v2r1_qtree_ops = {
Jan Kara498c6012009-11-16 18:09:47 +010040 .mem2disk_dqblk = v2r1_mem2diskdqb,
41 .disk2mem_dqblk = v2r1_disk2memdqb,
42 .is_id = v2r1_is_id,
Jan Kara1ccd14b2008-09-22 05:54:49 +020043};
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Jan Kara12095462008-08-20 14:45:12 +020045#define QUOTABLOCK_BITS 10
46#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
47
48static inline qsize_t v2_stoqb(qsize_t space)
49{
50 return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
51}
52
53static inline qsize_t v2_qbtos(qsize_t blocks)
54{
55 return blocks << QUOTABLOCK_BITS;
56}
57
Jan Kara498c6012009-11-16 18:09:47 +010058static int v2_read_header(struct super_block *sb, int type,
59 struct v2_disk_dqheader *dqhead)
60{
61 ssize_t size;
62
63 size = sb->s_op->quota_read(sb, type, (char *)dqhead,
64 sizeof(struct v2_disk_dqheader), 0);
65 if (size != sizeof(struct v2_disk_dqheader)) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +020066 quota_error(sb, "Failed header read: expected=%zd got=%zd",
67 sizeof(struct v2_disk_dqheader), size);
Jan Kara498c6012009-11-16 18:09:47 +010068 return 0;
69 }
70 return 1;
71}
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073/* Check whether given file is really vfsv0 quotafile */
74static int v2_check_quota_file(struct super_block *sb, int type)
75{
76 struct v2_disk_dqheader dqhead;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 static const uint quota_magics[] = V2_INITQMAGICS;
78 static const uint quota_versions[] = V2_INITQVERSIONS;
79
Jan Kara498c6012009-11-16 18:09:47 +010080 if (!v2_read_header(sb, type, &dqhead))
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
Jan Kara498c6012009-11-16 18:09:47 +010083 le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return 0;
85 return 1;
86}
87
88/* Read information header from quota file */
89static int v2_read_file_info(struct super_block *sb, int type)
90{
91 struct v2_disk_dqinfo dinfo;
Jan Kara498c6012009-11-16 18:09:47 +010092 struct v2_disk_dqheader dqhead;
Jan Kara1ccd14b2008-09-22 05:54:49 +020093 struct mem_dqinfo *info = sb_dqinfo(sb, type);
Jan Karae3d4d562008-10-02 18:44:14 +020094 struct qtree_mem_dqinfo *qinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 ssize_t size;
Jan Kara498c6012009-11-16 18:09:47 +010096 unsigned int version;
97
98 if (!v2_read_header(sb, type, &dqhead))
Jan Kara869835d2009-12-21 21:57:04 +010099 return -1;
Jan Kara498c6012009-11-16 18:09:47 +0100100 version = le32_to_cpu(dqhead.dqh_version);
Jan Kara869835d2009-12-21 21:57:04 +0100101 if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
102 (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
103 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
106 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
107 if (size != sizeof(struct v2_disk_dqinfo)) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200108 quota_error(sb, "Can't read info structure");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return -1;
110 }
Jan Karae3d4d562008-10-02 18:44:14 +0200111 info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
112 if (!info->dqi_priv) {
113 printk(KERN_WARNING
114 "Not enough memory for quota information structure.\n");
Davidlohr Bueso7a39de12011-01-20 15:32:05 -0300115 return -ENOMEM;
Jan Karae3d4d562008-10-02 18:44:14 +0200116 }
117 qinfo = info->dqi_priv;
Jan Kara498c6012009-11-16 18:09:47 +0100118 if (version == 0) {
119 /* limits are stored as unsigned 32-bit data */
Jan Kara7e08da52015-03-04 14:42:02 +0100120 info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS;
Jan Karab10a0812014-10-09 16:54:13 +0200121 info->dqi_max_ino_limit = 0xffffffff;
Jan Kara498c6012009-11-16 18:09:47 +0100122 } else {
Jan Kara7e08da52015-03-04 14:42:02 +0100123 /*
124 * Used space is stored as unsigned 64-bit value in bytes but
125 * quota core supports only signed 64-bit values so use that
126 * as a limit
127 */
128 info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */
129 info->dqi_max_ino_limit = 0x7fffffffffffffffLL;
Jan Kara498c6012009-11-16 18:09:47 +0100130 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
132 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
Jan Karac119c5b2014-11-19 09:03:28 +0100133 /* No flags currently supported */
134 info->dqi_flags = 0;
Jan Karae3d4d562008-10-02 18:44:14 +0200135 qinfo->dqi_sb = sb;
136 qinfo->dqi_type = type;
137 qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
138 qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
139 qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
140 qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
141 qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
142 qinfo->dqi_qtree_depth = qtree_depth(qinfo);
Jan Kara498c6012009-11-16 18:09:47 +0100143 if (version == 0) {
144 qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
145 qinfo->dqi_ops = &v2r0_qtree_ops;
146 } else {
147 qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
148 qinfo->dqi_ops = &v2r1_qtree_ops;
149 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return 0;
151}
152
153/* Write information header to quota file */
154static int v2_write_file_info(struct super_block *sb, int type)
155{
156 struct v2_disk_dqinfo dinfo;
Jan Kara1ccd14b2008-09-22 05:54:49 +0200157 struct mem_dqinfo *info = sb_dqinfo(sb, type);
Jan Karae3d4d562008-10-02 18:44:14 +0200158 struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 ssize_t size;
160
161 spin_lock(&dq_data_lock);
162 info->dqi_flags &= ~DQF_INFO_DIRTY;
163 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
164 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
Jan Karac119c5b2014-11-19 09:03:28 +0100165 /* No flags currently supported */
166 dinfo.dqi_flags = cpu_to_le32(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 spin_unlock(&dq_data_lock);
Jan Karae3d4d562008-10-02 18:44:14 +0200168 dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
169 dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
170 dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
172 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
173 if (size != sizeof(struct v2_disk_dqinfo)) {
Jiaying Zhangfb5ffb02010-07-20 16:54:43 +0200174 quota_error(sb, "Can't write info structure");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return -1;
176 }
177 return 0;
178}
179
Jan Kara498c6012009-11-16 18:09:47 +0100180static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Jan Kara498c6012009-11-16 18:09:47 +0100182 struct v2r0_disk_dqblk *d = dp, empty;
Jan Kara1ccd14b2008-09-22 05:54:49 +0200183 struct mem_dqblk *m = &dquot->dq_dqb;
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
186 m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
187 m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
188 m->dqb_itime = le64_to_cpu(d->dqb_itime);
Jan Kara12095462008-08-20 14:45:12 +0200189 m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
190 m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
192 m->dqb_btime = le64_to_cpu(d->dqb_btime);
Jan Kara1ccd14b2008-09-22 05:54:49 +0200193 /* We need to escape back all-zero structure */
Jan Kara498c6012009-11-16 18:09:47 +0100194 memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
Jan Kara1ccd14b2008-09-22 05:54:49 +0200195 empty.dqb_itime = cpu_to_le64(1);
Jan Kara498c6012009-11-16 18:09:47 +0100196 if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
Jan Kara1ccd14b2008-09-22 05:54:49 +0200197 m->dqb_itime = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
Jan Kara498c6012009-11-16 18:09:47 +0100200static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Jan Kara498c6012009-11-16 18:09:47 +0100202 struct v2r0_disk_dqblk *d = dp;
Jan Kara1ccd14b2008-09-22 05:54:49 +0200203 struct mem_dqblk *m = &dquot->dq_dqb;
204 struct qtree_mem_dqinfo *info =
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700205 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
Jan Kara1ccd14b2008-09-22 05:54:49 +0200206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
208 d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
209 d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
210 d->dqb_itime = cpu_to_le64(m->dqb_itime);
Jan Karacf770c12008-09-21 23:17:53 +0200211 d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
212 d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
214 d->dqb_btime = cpu_to_le64(m->dqb_btime);
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700215 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
Jan Kara1ccd14b2008-09-22 05:54:49 +0200216 if (qtree_entry_unused(info, dp))
217 d->dqb_itime = cpu_to_le64(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
Jan Kara498c6012009-11-16 18:09:47 +0100220static int v2r0_is_id(void *dp, struct dquot *dquot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Jan Kara498c6012009-11-16 18:09:47 +0100222 struct v2r0_disk_dqblk *d = dp;
223 struct qtree_mem_dqinfo *info =
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700224 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
Jan Kara498c6012009-11-16 18:09:47 +0100225
226 if (qtree_entry_unused(info, dp))
227 return 0;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700228 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
229 le32_to_cpu(d->dqb_id)),
230 dquot->dq_id);
Jan Kara498c6012009-11-16 18:09:47 +0100231}
232
233static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
234{
235 struct v2r1_disk_dqblk *d = dp, empty;
236 struct mem_dqblk *m = &dquot->dq_dqb;
237
238 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
239 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
240 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
241 m->dqb_itime = le64_to_cpu(d->dqb_itime);
242 m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
243 m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
244 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
245 m->dqb_btime = le64_to_cpu(d->dqb_btime);
246 /* We need to escape back all-zero structure */
247 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
248 empty.dqb_itime = cpu_to_le64(1);
249 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
250 m->dqb_itime = 0;
251}
252
253static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
254{
255 struct v2r1_disk_dqblk *d = dp;
256 struct mem_dqblk *m = &dquot->dq_dqb;
257 struct qtree_mem_dqinfo *info =
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700258 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
Jan Kara498c6012009-11-16 18:09:47 +0100259
260 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
261 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
262 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
263 d->dqb_itime = cpu_to_le64(m->dqb_itime);
264 d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
265 d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
266 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
267 d->dqb_btime = cpu_to_le64(m->dqb_btime);
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700268 d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
Jan Kara498c6012009-11-16 18:09:47 +0100269 if (qtree_entry_unused(info, dp))
270 d->dqb_itime = cpu_to_le64(1);
271}
272
273static int v2r1_is_id(void *dp, struct dquot *dquot)
274{
275 struct v2r1_disk_dqblk *d = dp;
Jan Kara1ccd14b2008-09-22 05:54:49 +0200276 struct qtree_mem_dqinfo *info =
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700277 sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Jan Kara1ccd14b2008-09-22 05:54:49 +0200279 if (qtree_entry_unused(info, dp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 return 0;
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700281 return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
282 le32_to_cpu(d->dqb_id)),
283 dquot->dq_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
286static int v2_read_dquot(struct dquot *dquot)
287{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700288 return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
Jan Kara1ccd14b2008-09-22 05:54:49 +0200291static int v2_write_dquot(struct dquot *dquot)
292{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700293 return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
Jan Kara1ccd14b2008-09-22 05:54:49 +0200294}
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296static int v2_release_dquot(struct dquot *dquot)
297{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -0700298 return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot);
Jan Karae3d4d562008-10-02 18:44:14 +0200299}
300
301static int v2_free_file_info(struct super_block *sb, int type)
302{
303 kfree(sb_dqinfo(sb, type)->dqi_priv);
304 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
Jan Kara00663732016-01-25 20:39:27 +0100307static int v2_get_next_id(struct super_block *sb, struct kqid *qid)
308{
309 return qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
310}
311
Alexey Dobriyan1472da52009-10-16 15:26:03 +0400312static const struct quota_format_ops v2_format_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 .check_quota_file = v2_check_quota_file,
314 .read_file_info = v2_read_file_info,
315 .write_file_info = v2_write_file_info,
Jan Karae3d4d562008-10-02 18:44:14 +0200316 .free_file_info = v2_free_file_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 .read_dqblk = v2_read_dquot,
318 .commit_dqblk = v2_write_dquot,
319 .release_dqblk = v2_release_dquot,
Jan Kara00663732016-01-25 20:39:27 +0100320 .get_next_id = v2_get_next_id,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321};
322
Jan Kara498c6012009-11-16 18:09:47 +0100323static struct quota_format_type v2r0_quota_format = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 .qf_fmt_id = QFMT_VFS_V0,
325 .qf_ops = &v2_format_ops,
326 .qf_owner = THIS_MODULE
327};
328
Jan Kara498c6012009-11-16 18:09:47 +0100329static struct quota_format_type v2r1_quota_format = {
330 .qf_fmt_id = QFMT_VFS_V1,
331 .qf_ops = &v2_format_ops,
332 .qf_owner = THIS_MODULE
333};
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335static int __init init_v2_quota_format(void)
336{
Jan Kara498c6012009-11-16 18:09:47 +0100337 int ret;
338
339 ret = register_quota_format(&v2r0_quota_format);
340 if (ret)
341 return ret;
342 return register_quota_format(&v2r1_quota_format);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
345static void __exit exit_v2_quota_format(void)
346{
Jan Kara498c6012009-11-16 18:09:47 +0100347 unregister_quota_format(&v2r0_quota_format);
348 unregister_quota_format(&v2r1_quota_format);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
351module_init(init_v2_quota_format);
352module_exit(exit_v2_quota_format);