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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/errno.h>
3#include <linux/fs.h>
4#include <linux/quota.h>
5#include <linux/quotaops.h>
6#include <linux/dqblk_v1.h>
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/module.h>
10
11#include <asm/byteorder.h>
12
13#include "quotaio_v1.h"
14
15MODULE_AUTHOR("Jan Kara");
16MODULE_DESCRIPTION("Old quota format support");
17MODULE_LICENSE("GPL");
18
19#define QUOTABLOCK_BITS 10
20#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
21
22static inline qsize_t v1_stoqb(qsize_t space)
23{
24 return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
25}
26
27static inline qsize_t v1_qbtos(qsize_t blocks)
28{
29 return blocks << QUOTABLOCK_BITS;
30}
31
32static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
33{
34 m->dqb_ihardlimit = d->dqb_ihardlimit;
35 m->dqb_isoftlimit = d->dqb_isoftlimit;
36 m->dqb_curinodes = d->dqb_curinodes;
37 m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
38 m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
39 m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
40 m->dqb_itime = d->dqb_itime;
41 m->dqb_btime = d->dqb_btime;
42}
43
44static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
45{
46 d->dqb_ihardlimit = m->dqb_ihardlimit;
47 d->dqb_isoftlimit = m->dqb_isoftlimit;
48 d->dqb_curinodes = m->dqb_curinodes;
49 d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
50 d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
51 d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
52 d->dqb_itime = m->dqb_itime;
53 d->dqb_btime = m->dqb_btime;
54}
55
56static int v1_read_dqblk(struct dquot *dquot)
57{
58 int type = dquot->dq_id.type;
59 struct v1_disk_dqblk dqblk;
60 struct quota_info *dqopt = sb_dqopt(dquot->dq_sb);
61
62 if (!dqopt->files[type])
63 return -EINVAL;
64
65 /* Set structure to 0s in case read fails/is after end of file */
66 memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
67 dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk,
68 sizeof(struct v1_disk_dqblk),
69 v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
70
71 v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
72 if (dquot->dq_dqb.dqb_bhardlimit == 0 &&
73 dquot->dq_dqb.dqb_bsoftlimit == 0 &&
74 dquot->dq_dqb.dqb_ihardlimit == 0 &&
75 dquot->dq_dqb.dqb_isoftlimit == 0)
76 set_bit(DQ_FAKE_B, &dquot->dq_flags);
77 dqstats_inc(DQST_READS);
78
79 return 0;
80}
81
82static int v1_commit_dqblk(struct dquot *dquot)
83{
84 short type = dquot->dq_id.type;
85 ssize_t ret;
86 struct v1_disk_dqblk dqblk;
87
88 v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
89 if (((type == USRQUOTA) && uid_eq(dquot->dq_id.uid, GLOBAL_ROOT_UID)) ||
90 ((type == GRPQUOTA) && gid_eq(dquot->dq_id.gid, GLOBAL_ROOT_GID))) {
91 dqblk.dqb_btime =
92 sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
93 dqblk.dqb_itime =
94 sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
95 }
96 ret = 0;
97 if (sb_dqopt(dquot->dq_sb)->files[type])
98 ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type,
99 (char *)&dqblk, sizeof(struct v1_disk_dqblk),
100 v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
101 if (ret != sizeof(struct v1_disk_dqblk)) {
102 quota_error(dquot->dq_sb, "dquota write failed");
103 if (ret >= 0)
104 ret = -EIO;
105 goto out;
106 }
107 ret = 0;
108
109out:
110 dqstats_inc(DQST_WRITES);
111
112 return ret;
113}
114
115/* Magics of new quota format */
116#define V2_INITQMAGICS {\
117 0xd9c01f11, /* USRQUOTA */\
118 0xd9c01927 /* GRPQUOTA */\
119}
120
121/* Header of new quota format */
122struct v2_disk_dqheader {
123 __le32 dqh_magic; /* Magic number identifying file */
124 __le32 dqh_version; /* File version */
125};
126
127static int v1_check_quota_file(struct super_block *sb, int type)
128{
129 struct inode *inode = sb_dqopt(sb)->files[type];
130 ulong blocks;
131 size_t off;
132 struct v2_disk_dqheader dqhead;
133 ssize_t size;
134 loff_t isize;
135 static const uint quota_magics[] = V2_INITQMAGICS;
136
137 isize = i_size_read(inode);
138 if (!isize)
139 return 0;
140 blocks = isize >> BLOCK_SIZE_BITS;
141 off = isize & (BLOCK_SIZE - 1);
142 if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) %
143 sizeof(struct v1_disk_dqblk))
144 return 0;
145 /* Doublecheck whether we didn't get file with new format - with old
146 * quotactl() this could happen */
147 size = sb->s_op->quota_read(sb, type, (char *)&dqhead,
148 sizeof(struct v2_disk_dqheader), 0);
149 if (size != sizeof(struct v2_disk_dqheader))
150 return 1; /* Probably not new format */
151 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
152 return 1; /* Definitely not new format */
153 printk(KERN_INFO
154 "VFS: %s: Refusing to turn on old quota format on given file."
155 " It probably contains newer quota format.\n", sb->s_id);
156 return 0; /* Seems like a new format file -> refuse it */
157}
158
159static int v1_read_file_info(struct super_block *sb, int type)
160{
161 struct quota_info *dqopt = sb_dqopt(sb);
162 struct v1_disk_dqblk dqblk;
163 unsigned int memalloc;
164 int ret;
165
166 down_read(&dqopt->dqio_sem);
167 memalloc = memalloc_nofs_save();
168 ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
169 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
170 if (ret != sizeof(struct v1_disk_dqblk)) {
171 if (ret >= 0)
172 ret = -EIO;
173 goto out;
174 }
175 ret = 0;
176 /* limits are stored as unsigned 32-bit data */
177 dqopt->info[type].dqi_max_spc_limit = 0xffffffffULL << QUOTABLOCK_BITS;
178 dqopt->info[type].dqi_max_ino_limit = 0xffffffff;
179 dqopt->info[type].dqi_igrace =
180 dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
181 dqopt->info[type].dqi_bgrace =
182 dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
183out:
184 memalloc_nofs_restore(memalloc);
185 up_read(&dqopt->dqio_sem);
186 return ret;
187}
188
189static int v1_write_file_info(struct super_block *sb, int type)
190{
191 struct quota_info *dqopt = sb_dqopt(sb);
192 struct v1_disk_dqblk dqblk;
193 unsigned int memalloc;
194 int ret;
195
196 down_write(&dqopt->dqio_sem);
197 memalloc = memalloc_nofs_save();
198 ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
199 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
200 if (ret != sizeof(struct v1_disk_dqblk)) {
201 if (ret >= 0)
202 ret = -EIO;
203 goto out;
204 }
205 spin_lock(&dq_data_lock);
206 dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
207 dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
208 dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
209 spin_unlock(&dq_data_lock);
210 ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
211 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
212 if (ret == sizeof(struct v1_disk_dqblk))
213 ret = 0;
214 else if (ret >= 0)
215 ret = -EIO;
216out:
217 memalloc_nofs_restore(memalloc);
218 up_write(&dqopt->dqio_sem);
219 return ret;
220}
221
222static const struct quota_format_ops v1_format_ops = {
223 .check_quota_file = v1_check_quota_file,
224 .read_file_info = v1_read_file_info,
225 .write_file_info = v1_write_file_info,
226 .read_dqblk = v1_read_dqblk,
227 .commit_dqblk = v1_commit_dqblk,
228};
229
230static struct quota_format_type v1_quota_format = {
231 .qf_fmt_id = QFMT_VFS_OLD,
232 .qf_ops = &v1_format_ops,
233 .qf_owner = THIS_MODULE
234};
235
236static int __init init_v1_quota_format(void)
237{
238 return register_quota_format(&v1_quota_format);
239}
240
241static void __exit exit_v1_quota_format(void)
242{
243 unregister_quota_format(&v1_quota_format);
244}
245
246module_init(init_v1_quota_format);
247module_exit(exit_v1_quota_format);
248
1#include <linux/errno.h>
2#include <linux/fs.h>
3#include <linux/quota.h>
4#include <linux/quotaops.h>
5#include <linux/dqblk_v1.h>
6#include <linux/kernel.h>
7#include <linux/init.h>
8#include <linux/module.h>
9
10#include <asm/byteorder.h>
11
12#include "quotaio_v1.h"
13
14MODULE_AUTHOR("Jan Kara");
15MODULE_DESCRIPTION("Old quota format support");
16MODULE_LICENSE("GPL");
17
18#define QUOTABLOCK_BITS 10
19#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
20
21static inline qsize_t v1_stoqb(qsize_t space)
22{
23 return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS;
24}
25
26static inline qsize_t v1_qbtos(qsize_t blocks)
27{
28 return blocks << QUOTABLOCK_BITS;
29}
30
31static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d)
32{
33 m->dqb_ihardlimit = d->dqb_ihardlimit;
34 m->dqb_isoftlimit = d->dqb_isoftlimit;
35 m->dqb_curinodes = d->dqb_curinodes;
36 m->dqb_bhardlimit = v1_qbtos(d->dqb_bhardlimit);
37 m->dqb_bsoftlimit = v1_qbtos(d->dqb_bsoftlimit);
38 m->dqb_curspace = v1_qbtos(d->dqb_curblocks);
39 m->dqb_itime = d->dqb_itime;
40 m->dqb_btime = d->dqb_btime;
41}
42
43static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
44{
45 d->dqb_ihardlimit = m->dqb_ihardlimit;
46 d->dqb_isoftlimit = m->dqb_isoftlimit;
47 d->dqb_curinodes = m->dqb_curinodes;
48 d->dqb_bhardlimit = v1_stoqb(m->dqb_bhardlimit);
49 d->dqb_bsoftlimit = v1_stoqb(m->dqb_bsoftlimit);
50 d->dqb_curblocks = v1_stoqb(m->dqb_curspace);
51 d->dqb_itime = m->dqb_itime;
52 d->dqb_btime = m->dqb_btime;
53}
54
55static int v1_read_dqblk(struct dquot *dquot)
56{
57 int type = dquot->dq_id.type;
58 struct v1_disk_dqblk dqblk;
59
60 if (!sb_dqopt(dquot->dq_sb)->files[type])
61 return -EINVAL;
62
63 /* Set structure to 0s in case read fails/is after end of file */
64 memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
65 dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk,
66 sizeof(struct v1_disk_dqblk),
67 v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
68
69 v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
70 if (dquot->dq_dqb.dqb_bhardlimit == 0 &&
71 dquot->dq_dqb.dqb_bsoftlimit == 0 &&
72 dquot->dq_dqb.dqb_ihardlimit == 0 &&
73 dquot->dq_dqb.dqb_isoftlimit == 0)
74 set_bit(DQ_FAKE_B, &dquot->dq_flags);
75 dqstats_inc(DQST_READS);
76
77 return 0;
78}
79
80static int v1_commit_dqblk(struct dquot *dquot)
81{
82 short type = dquot->dq_id.type;
83 ssize_t ret;
84 struct v1_disk_dqblk dqblk;
85
86 v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb);
87 if (((type == USRQUOTA) && uid_eq(dquot->dq_id.uid, GLOBAL_ROOT_UID)) ||
88 ((type == GRPQUOTA) && gid_eq(dquot->dq_id.gid, GLOBAL_ROOT_GID))) {
89 dqblk.dqb_btime =
90 sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace;
91 dqblk.dqb_itime =
92 sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace;
93 }
94 ret = 0;
95 if (sb_dqopt(dquot->dq_sb)->files[type])
96 ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type,
97 (char *)&dqblk, sizeof(struct v1_disk_dqblk),
98 v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
99 if (ret != sizeof(struct v1_disk_dqblk)) {
100 quota_error(dquot->dq_sb, "dquota write failed");
101 if (ret >= 0)
102 ret = -EIO;
103 goto out;
104 }
105 ret = 0;
106
107out:
108 dqstats_inc(DQST_WRITES);
109
110 return ret;
111}
112
113/* Magics of new quota format */
114#define V2_INITQMAGICS {\
115 0xd9c01f11, /* USRQUOTA */\
116 0xd9c01927 /* GRPQUOTA */\
117}
118
119/* Header of new quota format */
120struct v2_disk_dqheader {
121 __le32 dqh_magic; /* Magic number identifying file */
122 __le32 dqh_version; /* File version */
123};
124
125static int v1_check_quota_file(struct super_block *sb, int type)
126{
127 struct inode *inode = sb_dqopt(sb)->files[type];
128 ulong blocks;
129 size_t off;
130 struct v2_disk_dqheader dqhead;
131 ssize_t size;
132 loff_t isize;
133 static const uint quota_magics[] = V2_INITQMAGICS;
134
135 isize = i_size_read(inode);
136 if (!isize)
137 return 0;
138 blocks = isize >> BLOCK_SIZE_BITS;
139 off = isize & (BLOCK_SIZE - 1);
140 if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) %
141 sizeof(struct v1_disk_dqblk))
142 return 0;
143 /* Doublecheck whether we didn't get file with new format - with old
144 * quotactl() this could happen */
145 size = sb->s_op->quota_read(sb, type, (char *)&dqhead,
146 sizeof(struct v2_disk_dqheader), 0);
147 if (size != sizeof(struct v2_disk_dqheader))
148 return 1; /* Probably not new format */
149 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type])
150 return 1; /* Definitely not new format */
151 printk(KERN_INFO
152 "VFS: %s: Refusing to turn on old quota format on given file."
153 " It probably contains newer quota format.\n", sb->s_id);
154 return 0; /* Seems like a new format file -> refuse it */
155}
156
157static int v1_read_file_info(struct super_block *sb, int type)
158{
159 struct quota_info *dqopt = sb_dqopt(sb);
160 struct v1_disk_dqblk dqblk;
161 int ret;
162
163 ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
164 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
165 if (ret != sizeof(struct v1_disk_dqblk)) {
166 if (ret >= 0)
167 ret = -EIO;
168 goto out;
169 }
170 ret = 0;
171 /* limits are stored as unsigned 32-bit data */
172 dqopt->info[type].dqi_max_spc_limit = 0xffffffffULL << QUOTABLOCK_BITS;
173 dqopt->info[type].dqi_max_ino_limit = 0xffffffff;
174 dqopt->info[type].dqi_igrace =
175 dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME;
176 dqopt->info[type].dqi_bgrace =
177 dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME;
178out:
179 return ret;
180}
181
182static int v1_write_file_info(struct super_block *sb, int type)
183{
184 struct quota_info *dqopt = sb_dqopt(sb);
185 struct v1_disk_dqblk dqblk;
186 int ret;
187
188 dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY;
189 ret = sb->s_op->quota_read(sb, type, (char *)&dqblk,
190 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
191 if (ret != sizeof(struct v1_disk_dqblk)) {
192 if (ret >= 0)
193 ret = -EIO;
194 goto out;
195 }
196 dqblk.dqb_itime = dqopt->info[type].dqi_igrace;
197 dqblk.dqb_btime = dqopt->info[type].dqi_bgrace;
198 ret = sb->s_op->quota_write(sb, type, (char *)&dqblk,
199 sizeof(struct v1_disk_dqblk), v1_dqoff(0));
200 if (ret == sizeof(struct v1_disk_dqblk))
201 ret = 0;
202 else if (ret > 0)
203 ret = -EIO;
204out:
205 return ret;
206}
207
208static const struct quota_format_ops v1_format_ops = {
209 .check_quota_file = v1_check_quota_file,
210 .read_file_info = v1_read_file_info,
211 .write_file_info = v1_write_file_info,
212 .free_file_info = NULL,
213 .read_dqblk = v1_read_dqblk,
214 .commit_dqblk = v1_commit_dqblk,
215};
216
217static struct quota_format_type v1_quota_format = {
218 .qf_fmt_id = QFMT_VFS_OLD,
219 .qf_ops = &v1_format_ops,
220 .qf_owner = THIS_MODULE
221};
222
223static int __init init_v1_quota_format(void)
224{
225 return register_quota_format(&v1_quota_format);
226}
227
228static void __exit exit_v1_quota_format(void)
229{
230 unregister_quota_format(&v1_quota_format);
231}
232
233module_init(init_v1_quota_format);
234module_exit(exit_v1_quota_format);
235