Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/slab.h> | |
74abb989 | 13 | #include <linux/quotaops.h> |
1da177e4 LT |
14 | |
15 | #include <asm/byteorder.h> | |
16 | ||
1ccd14b9 | 17 | #include "quota_tree.h" |
cf770c13 JK |
18 | #include "quotaio_v2.h" |
19 | ||
1da177e4 LT |
20 | MODULE_AUTHOR("Jan Kara"); |
21 | MODULE_DESCRIPTION("Quota format v2 support"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
24 | #define __QUOTA_V2_PARANOIA | |
25 | ||
1ccd14b9 JK |
26 | static void v2_mem2diskdqb(void *dp, struct dquot *dquot); |
27 | static void v2_disk2memdqb(struct dquot *dquot, void *dp); | |
28 | static int v2_is_id(void *dp, struct dquot *dquot); | |
1da177e4 | 29 | |
1ccd14b9 JK |
30 | static struct qtree_fmt_operations v2_qtree_ops = { |
31 | .mem2disk_dqblk = v2_mem2diskdqb, | |
32 | .disk2mem_dqblk = v2_disk2memdqb, | |
33 | .is_id = v2_is_id, | |
34 | }; | |
1da177e4 | 35 | |
12095460 JK |
36 | #define QUOTABLOCK_BITS 10 |
37 | #define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) | |
38 | ||
39 | static inline qsize_t v2_stoqb(qsize_t space) | |
40 | { | |
41 | return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS; | |
42 | } | |
43 | ||
44 | static inline qsize_t v2_qbtos(qsize_t blocks) | |
45 | { | |
46 | return blocks << QUOTABLOCK_BITS; | |
47 | } | |
48 | ||
1da177e4 LT |
49 | /* Check whether given file is really vfsv0 quotafile */ |
50 | static int v2_check_quota_file(struct super_block *sb, int type) | |
51 | { | |
52 | struct v2_disk_dqheader dqhead; | |
53 | ssize_t size; | |
54 | static const uint quota_magics[] = V2_INITQMAGICS; | |
55 | static const uint quota_versions[] = V2_INITQVERSIONS; | |
56 | ||
268157ba JK |
57 | size = sb->s_op->quota_read(sb, type, (char *)&dqhead, |
58 | sizeof(struct v2_disk_dqheader), 0); | |
1da177e4 | 59 | if (size != sizeof(struct v2_disk_dqheader)) { |
8c17e1eb | 60 | printk("quota_v2: failed read expected=%zd got=%zd\n", |
31358063 | 61 | sizeof(struct v2_disk_dqheader), size); |
1da177e4 LT |
62 | return 0; |
63 | } | |
64 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || | |
65 | le32_to_cpu(dqhead.dqh_version) != quota_versions[type]) | |
66 | return 0; | |
67 | return 1; | |
68 | } | |
69 | ||
70 | /* Read information header from quota file */ | |
71 | static int v2_read_file_info(struct super_block *sb, int type) | |
72 | { | |
73 | struct v2_disk_dqinfo dinfo; | |
1ccd14b9 | 74 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
e3d4d56b | 75 | struct qtree_mem_dqinfo *qinfo; |
1da177e4 LT |
76 | ssize_t size; |
77 | ||
78 | size = sb->s_op->quota_read(sb, type, (char *)&dinfo, | |
79 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
80 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
81 | printk(KERN_WARNING "Can't read info structure on device %s.\n", | |
82 | sb->s_id); | |
83 | return -1; | |
84 | } | |
e3d4d56b JK |
85 | info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); |
86 | if (!info->dqi_priv) { | |
87 | printk(KERN_WARNING | |
88 | "Not enough memory for quota information structure.\n"); | |
89 | return -1; | |
90 | } | |
91 | qinfo = info->dqi_priv; | |
338bf9af AP |
92 | /* limits are stored as unsigned 32-bit data */ |
93 | info->dqi_maxblimit = 0xffffffff; | |
94 | info->dqi_maxilimit = 0xffffffff; | |
1da177e4 LT |
95 | info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); |
96 | info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); | |
97 | info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); | |
e3d4d56b JK |
98 | qinfo->dqi_sb = sb; |
99 | qinfo->dqi_type = type; | |
100 | qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); | |
101 | qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); | |
102 | qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); | |
103 | qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; | |
104 | qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; | |
105 | qinfo->dqi_qtree_depth = qtree_depth(qinfo); | |
106 | qinfo->dqi_entry_size = sizeof(struct v2_disk_dqblk); | |
107 | qinfo->dqi_ops = &v2_qtree_ops; | |
1da177e4 LT |
108 | return 0; |
109 | } | |
110 | ||
111 | /* Write information header to quota file */ | |
112 | static int v2_write_file_info(struct super_block *sb, int type) | |
113 | { | |
114 | struct v2_disk_dqinfo dinfo; | |
1ccd14b9 | 115 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
e3d4d56b | 116 | struct qtree_mem_dqinfo *qinfo = info->dqi_priv; |
1da177e4 LT |
117 | ssize_t size; |
118 | ||
119 | spin_lock(&dq_data_lock); | |
120 | info->dqi_flags &= ~DQF_INFO_DIRTY; | |
121 | dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); | |
122 | dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); | |
123 | dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); | |
124 | spin_unlock(&dq_data_lock); | |
e3d4d56b JK |
125 | dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks); |
126 | dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk); | |
127 | dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry); | |
1da177e4 LT |
128 | size = sb->s_op->quota_write(sb, type, (char *)&dinfo, |
129 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); | |
130 | if (size != sizeof(struct v2_disk_dqinfo)) { | |
131 | printk(KERN_WARNING "Can't write info structure on device %s.\n", | |
132 | sb->s_id); | |
133 | return -1; | |
134 | } | |
135 | return 0; | |
136 | } | |
137 | ||
1ccd14b9 | 138 | static void v2_disk2memdqb(struct dquot *dquot, void *dp) |
1da177e4 | 139 | { |
1ccd14b9 JK |
140 | struct v2_disk_dqblk *d = dp, empty; |
141 | struct mem_dqblk *m = &dquot->dq_dqb; | |
142 | ||
1da177e4 LT |
143 | m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); |
144 | m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); | |
145 | m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); | |
146 | m->dqb_itime = le64_to_cpu(d->dqb_itime); | |
12095460 JK |
147 | m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); |
148 | m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); | |
1da177e4 LT |
149 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); |
150 | m->dqb_btime = le64_to_cpu(d->dqb_btime); | |
1ccd14b9 JK |
151 | /* We need to escape back all-zero structure */ |
152 | memset(&empty, 0, sizeof(struct v2_disk_dqblk)); | |
153 | empty.dqb_itime = cpu_to_le64(1); | |
154 | if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk))) | |
155 | m->dqb_itime = 0; | |
1da177e4 LT |
156 | } |
157 | ||
1ccd14b9 | 158 | static void v2_mem2diskdqb(void *dp, struct dquot *dquot) |
1da177e4 | 159 | { |
1ccd14b9 JK |
160 | struct v2_disk_dqblk *d = dp; |
161 | struct mem_dqblk *m = &dquot->dq_dqb; | |
162 | struct qtree_mem_dqinfo *info = | |
e3d4d56b | 163 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
1ccd14b9 | 164 | |
1da177e4 LT |
165 | d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); |
166 | d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); | |
167 | d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); | |
168 | d->dqb_itime = cpu_to_le64(m->dqb_itime); | |
cf770c13 JK |
169 | d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); |
170 | d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); | |
1da177e4 LT |
171 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); |
172 | d->dqb_btime = cpu_to_le64(m->dqb_btime); | |
1ccd14b9 JK |
173 | d->dqb_id = cpu_to_le32(dquot->dq_id); |
174 | if (qtree_entry_unused(info, dp)) | |
175 | d->dqb_itime = cpu_to_le64(1); | |
1da177e4 LT |
176 | } |
177 | ||
1ccd14b9 | 178 | static int v2_is_id(void *dp, struct dquot *dquot) |
1da177e4 | 179 | { |
1ccd14b9 JK |
180 | struct v2_disk_dqblk *d = dp; |
181 | struct qtree_mem_dqinfo *info = | |
e3d4d56b | 182 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
1da177e4 | 183 | |
1ccd14b9 | 184 | if (qtree_entry_unused(info, dp)) |
1da177e4 | 185 | return 0; |
1ccd14b9 | 186 | return le32_to_cpu(d->dqb_id) == dquot->dq_id; |
1da177e4 LT |
187 | } |
188 | ||
1ccd14b9 | 189 | static int v2_read_dquot(struct dquot *dquot) |
1da177e4 | 190 | { |
e3d4d56b | 191 | return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); |
1da177e4 LT |
192 | } |
193 | ||
1da177e4 LT |
194 | static int v2_write_dquot(struct dquot *dquot) |
195 | { | |
e3d4d56b | 196 | return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); |
1da177e4 LT |
197 | } |
198 | ||
1da177e4 LT |
199 | static int v2_release_dquot(struct dquot *dquot) |
200 | { | |
e3d4d56b JK |
201 | return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); |
202 | } | |
203 | ||
204 | static int v2_free_file_info(struct super_block *sb, int type) | |
205 | { | |
206 | kfree(sb_dqinfo(sb, type)->dqi_priv); | |
207 | return 0; | |
1da177e4 LT |
208 | } |
209 | ||
210 | static struct quota_format_ops v2_format_ops = { | |
211 | .check_quota_file = v2_check_quota_file, | |
212 | .read_file_info = v2_read_file_info, | |
213 | .write_file_info = v2_write_file_info, | |
e3d4d56b | 214 | .free_file_info = v2_free_file_info, |
1da177e4 LT |
215 | .read_dqblk = v2_read_dquot, |
216 | .commit_dqblk = v2_write_dquot, | |
217 | .release_dqblk = v2_release_dquot, | |
218 | }; | |
219 | ||
220 | static struct quota_format_type v2_quota_format = { | |
221 | .qf_fmt_id = QFMT_VFS_V0, | |
222 | .qf_ops = &v2_format_ops, | |
223 | .qf_owner = THIS_MODULE | |
224 | }; | |
225 | ||
226 | static int __init init_v2_quota_format(void) | |
227 | { | |
228 | return register_quota_format(&v2_quota_format); | |
229 | } | |
230 | ||
231 | static void __exit exit_v2_quota_format(void) | |
232 | { | |
233 | unregister_quota_format(&v2_quota_format); | |
234 | } | |
235 | ||
236 | module_init(init_v2_quota_format); | |
237 | module_exit(exit_v2_quota_format); |