tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/quotaops.h>
14
15#include <asm/byteorder.h>
16
17#include "quota_tree.h"
18#include "quotaio_v2.h"
19
20MODULE_AUTHOR("Jan Kara");
21MODULE_DESCRIPTION("Quota format v2 support");
22MODULE_LICENSE("GPL");
23
24#define __QUOTA_V2_PARANOIA
25
26static 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);
32
33static struct qtree_fmt_operations v2r0_qtree_ops = {
34 .mem2disk_dqblk = v2r0_mem2diskdqb,
35 .disk2mem_dqblk = v2r0_disk2memdqb,
36 .is_id = v2r0_is_id,
37};
38
39static struct qtree_fmt_operations v2r1_qtree_ops = {
40 .mem2disk_dqblk = v2r1_mem2diskdqb,
41 .disk2mem_dqblk = v2r1_disk2memdqb,
42 .is_id = v2r1_is_id,
43};
44
45#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
58static 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)) {
66 q_warn(KERN_WARNING "quota_v2: Failed header read:"
67 " expected=%zd got=%zd\n",
68 sizeof(struct v2_disk_dqheader), size);
69 return 0;
70 }
71 return 1;
72}
73
74/* Check whether given file is really vfsv0 quotafile */
75static int v2_check_quota_file(struct super_block *sb, int type)
76{
77 struct v2_disk_dqheader dqhead;
78 static const uint quota_magics[] = V2_INITQMAGICS;
79 static const uint quota_versions[] = V2_INITQVERSIONS;
80
81 if (!v2_read_header(sb, type, &dqhead))
82 return 0;
83 if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] ||
84 le32_to_cpu(dqhead.dqh_version) > quota_versions[type])
85 return 0;
86 return 1;
87}
88
89/* Read information header from quota file */
90static int v2_read_file_info(struct super_block *sb, int type)
91{
92 struct v2_disk_dqinfo dinfo;
93 struct v2_disk_dqheader dqhead;
94 struct mem_dqinfo *info = sb_dqinfo(sb, type);
95 struct qtree_mem_dqinfo *qinfo;
96 ssize_t size;
97 unsigned int version;
98
99 if (!v2_read_header(sb, type, &dqhead))
100 return -1;
101 version = le32_to_cpu(dqhead.dqh_version);
102 if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) ||
103 (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1))
104 return -1;
105
106 size = sb->s_op->quota_read(sb, type, (char *)&dinfo,
107 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
108 if (size != sizeof(struct v2_disk_dqinfo)) {
109 q_warn(KERN_WARNING "quota_v2: Can't read info structure on device %s.\n",
110 sb->s_id);
111 return -1;
112 }
113 info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS);
114 if (!info->dqi_priv) {
115 printk(KERN_WARNING
116 "Not enough memory for quota information structure.\n");
117 return -1;
118 }
119 qinfo = info->dqi_priv;
120 if (version == 0) {
121 /* limits are stored as unsigned 32-bit data */
122 info->dqi_maxblimit = 0xffffffff;
123 info->dqi_maxilimit = 0xffffffff;
124 } else {
125 /* used space is stored as unsigned 64-bit value */
126 info->dqi_maxblimit = 0xffffffffffffffffULL; /* 2^64-1 */
127 info->dqi_maxilimit = 0xffffffffffffffffULL;
128 }
129 info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
130 info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
131 info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
132 qinfo->dqi_sb = sb;
133 qinfo->dqi_type = type;
134 qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
135 qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
136 qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
137 qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS;
138 qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS;
139 qinfo->dqi_qtree_depth = qtree_depth(qinfo);
140 if (version == 0) {
141 qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk);
142 qinfo->dqi_ops = &v2r0_qtree_ops;
143 } else {
144 qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk);
145 qinfo->dqi_ops = &v2r1_qtree_ops;
146 }
147 return 0;
148}
149
150/* Write information header to quota file */
151static int v2_write_file_info(struct super_block *sb, int type)
152{
153 struct v2_disk_dqinfo dinfo;
154 struct mem_dqinfo *info = sb_dqinfo(sb, type);
155 struct qtree_mem_dqinfo *qinfo = info->dqi_priv;
156 ssize_t size;
157
158 spin_lock(&dq_data_lock);
159 info->dqi_flags &= ~DQF_INFO_DIRTY;
160 dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
161 dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
162 dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
163 spin_unlock(&dq_data_lock);
164 dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
165 dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);
166 dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry);
167 size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
168 sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF);
169 if (size != sizeof(struct v2_disk_dqinfo)) {
170 q_warn(KERN_WARNING "Can't write info structure on device %s.\n",
171 sb->s_id);
172 return -1;
173 }
174 return 0;
175}
176
177static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
178{
179 struct v2r0_disk_dqblk *d = dp, empty;
180 struct mem_dqblk *m = &dquot->dq_dqb;
181
182 m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit);
183 m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit);
184 m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes);
185 m->dqb_itime = le64_to_cpu(d->dqb_itime);
186 m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit));
187 m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit));
188 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
189 m->dqb_btime = le64_to_cpu(d->dqb_btime);
190 /* We need to escape back all-zero structure */
191 memset(&empty, 0, sizeof(struct v2r0_disk_dqblk));
192 empty.dqb_itime = cpu_to_le64(1);
193 if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk)))
194 m->dqb_itime = 0;
195}
196
197static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
198{
199 struct v2r0_disk_dqblk *d = dp;
200 struct mem_dqblk *m = &dquot->dq_dqb;
201 struct qtree_mem_dqinfo *info =
202 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
203
204 d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit);
205 d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit);
206 d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes);
207 d->dqb_itime = cpu_to_le64(m->dqb_itime);
208 d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit));
209 d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
210 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
211 d->dqb_btime = cpu_to_le64(m->dqb_btime);
212 d->dqb_id = cpu_to_le32(dquot->dq_id);
213 if (qtree_entry_unused(info, dp))
214 d->dqb_itime = cpu_to_le64(1);
215}
216
217static int v2r0_is_id(void *dp, struct dquot *dquot)
218{
219 struct v2r0_disk_dqblk *d = dp;
220 struct qtree_mem_dqinfo *info =
221 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
222
223 if (qtree_entry_unused(info, dp))
224 return 0;
225 return le32_to_cpu(d->dqb_id) == dquot->dq_id;
226}
227
228static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
229{
230 struct v2r1_disk_dqblk *d = dp, empty;
231 struct mem_dqblk *m = &dquot->dq_dqb;
232
233 m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
234 m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
235 m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
236 m->dqb_itime = le64_to_cpu(d->dqb_itime);
237 m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit));
238 m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit));
239 m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
240 m->dqb_btime = le64_to_cpu(d->dqb_btime);
241 /* We need to escape back all-zero structure */
242 memset(&empty, 0, sizeof(struct v2r1_disk_dqblk));
243 empty.dqb_itime = cpu_to_le64(1);
244 if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk)))
245 m->dqb_itime = 0;
246}
247
248static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
249{
250 struct v2r1_disk_dqblk *d = dp;
251 struct mem_dqblk *m = &dquot->dq_dqb;
252 struct qtree_mem_dqinfo *info =
253 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
254
255 d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
256 d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
257 d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
258 d->dqb_itime = cpu_to_le64(m->dqb_itime);
259 d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit));
260 d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
261 d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
262 d->dqb_btime = cpu_to_le64(m->dqb_btime);
263 d->dqb_id = cpu_to_le32(dquot->dq_id);
264 if (qtree_entry_unused(info, dp))
265 d->dqb_itime = cpu_to_le64(1);
266}
267
268static int v2r1_is_id(void *dp, struct dquot *dquot)
269{
270 struct v2r1_disk_dqblk *d = dp;
271 struct qtree_mem_dqinfo *info =
272 sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv;
273
274 if (qtree_entry_unused(info, dp))
275 return 0;
276 return le32_to_cpu(d->dqb_id) == dquot->dq_id;
277}
278
279static int v2_read_dquot(struct dquot *dquot)
280{
281 return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
282}
283
284static int v2_write_dquot(struct dquot *dquot)
285{
286 return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
287}
288
289static int v2_release_dquot(struct dquot *dquot)
290{
291 return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot);
292}
293
294static int v2_free_file_info(struct super_block *sb, int type)
295{
296 kfree(sb_dqinfo(sb, type)->dqi_priv);
297 return 0;
298}
299
300static const struct quota_format_ops v2_format_ops = {
301 .check_quota_file = v2_check_quota_file,
302 .read_file_info = v2_read_file_info,
303 .write_file_info = v2_write_file_info,
304 .free_file_info = v2_free_file_info,
305 .read_dqblk = v2_read_dquot,
306 .commit_dqblk = v2_write_dquot,
307 .release_dqblk = v2_release_dquot,
308};
309
310static struct quota_format_type v2r0_quota_format = {
311 .qf_fmt_id = QFMT_VFS_V0,
312 .qf_ops = &v2_format_ops,
313 .qf_owner = THIS_MODULE
314};
315
316static struct quota_format_type v2r1_quota_format = {
317 .qf_fmt_id = QFMT_VFS_V1,
318 .qf_ops = &v2_format_ops,
319 .qf_owner = THIS_MODULE
320};
321
322static int __init init_v2_quota_format(void)
323{
324 int ret;
325
326 ret = register_quota_format(&v2r0_quota_format);
327 if (ret)
328 return ret;
329 return register_quota_format(&v2r1_quota_format);
330}
331
332static void __exit exit_v2_quota_format(void)
333{
334 unregister_quota_format(&v2r0_quota_format);
335 unregister_quota_format(&v2r1_quota_format);
336}
337
338module_init(init_v2_quota_format);
339module_exit(exit_v2_quota_format);