Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/fs/quota_v1.c
Parent Directory | Revision Log
Revision 630 -
(show annotations)
(download)
Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
File MIME type: text/plain
File size: 5836 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 2 months ago) by niro
File MIME type: text/plain
File size: 5836 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #include <linux/errno.h> |
2 | #include <linux/fs.h> |
3 | #include <linux/quota.h> |
4 | #include <linux/dqblk_v1.h> |
5 | #include <linux/quotaio_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 | MODULE_AUTHOR("Jan Kara"); |
13 | MODULE_DESCRIPTION("Old quota format support"); |
14 | MODULE_LICENSE("GPL"); |
15 | |
16 | static void v1_disk2mem_dqblk(struct mem_dqblk *m, struct v1_disk_dqblk *d) |
17 | { |
18 | m->dqb_ihardlimit = d->dqb_ihardlimit; |
19 | m->dqb_isoftlimit = d->dqb_isoftlimit; |
20 | m->dqb_curinodes = d->dqb_curinodes; |
21 | m->dqb_bhardlimit = d->dqb_bhardlimit; |
22 | m->dqb_bsoftlimit = d->dqb_bsoftlimit; |
23 | m->dqb_curspace = ((qsize_t)d->dqb_curblocks) << QUOTABLOCK_BITS; |
24 | m->dqb_itime = d->dqb_itime; |
25 | m->dqb_btime = d->dqb_btime; |
26 | } |
27 | |
28 | static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m) |
29 | { |
30 | d->dqb_ihardlimit = m->dqb_ihardlimit; |
31 | d->dqb_isoftlimit = m->dqb_isoftlimit; |
32 | d->dqb_curinodes = m->dqb_curinodes; |
33 | d->dqb_bhardlimit = m->dqb_bhardlimit; |
34 | d->dqb_bsoftlimit = m->dqb_bsoftlimit; |
35 | d->dqb_curblocks = toqb(m->dqb_curspace); |
36 | d->dqb_itime = m->dqb_itime; |
37 | d->dqb_btime = m->dqb_btime; |
38 | } |
39 | |
40 | static int v1_read_dqblk(struct dquot *dquot) |
41 | { |
42 | int type = dquot->dq_type; |
43 | struct v1_disk_dqblk dqblk; |
44 | |
45 | if (!sb_dqopt(dquot->dq_sb)->files[type]) |
46 | return -EINVAL; |
47 | |
48 | /* Set structure to 0s in case read fails/is after end of file */ |
49 | memset(&dqblk, 0, sizeof(struct v1_disk_dqblk)); |
50 | dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id)); |
51 | |
52 | v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk); |
53 | if (dquot->dq_dqb.dqb_bhardlimit == 0 && dquot->dq_dqb.dqb_bsoftlimit == 0 && |
54 | dquot->dq_dqb.dqb_ihardlimit == 0 && dquot->dq_dqb.dqb_isoftlimit == 0) |
55 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
56 | dqstats.reads++; |
57 | |
58 | return 0; |
59 | } |
60 | |
61 | static int v1_commit_dqblk(struct dquot *dquot) |
62 | { |
63 | short type = dquot->dq_type; |
64 | ssize_t ret; |
65 | struct v1_disk_dqblk dqblk; |
66 | |
67 | v1_mem2disk_dqblk(&dqblk, &dquot->dq_dqb); |
68 | if (dquot->dq_id == 0) { |
69 | dqblk.dqb_btime = sb_dqopt(dquot->dq_sb)->info[type].dqi_bgrace; |
70 | dqblk.dqb_itime = sb_dqopt(dquot->dq_sb)->info[type].dqi_igrace; |
71 | } |
72 | ret = 0; |
73 | if (sb_dqopt(dquot->dq_sb)->files[type]) |
74 | ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type, (char *)&dqblk, |
75 | sizeof(struct v1_disk_dqblk), v1_dqoff(dquot->dq_id)); |
76 | if (ret != sizeof(struct v1_disk_dqblk)) { |
77 | printk(KERN_WARNING "VFS: dquota write failed on dev %s\n", |
78 | dquot->dq_sb->s_id); |
79 | if (ret >= 0) |
80 | ret = -EIO; |
81 | goto out; |
82 | } |
83 | ret = 0; |
84 | |
85 | out: |
86 | dqstats.writes++; |
87 | |
88 | return ret; |
89 | } |
90 | |
91 | /* Magics of new quota format */ |
92 | #define V2_INITQMAGICS {\ |
93 | 0xd9c01f11, /* USRQUOTA */\ |
94 | 0xd9c01927 /* GRPQUOTA */\ |
95 | } |
96 | |
97 | /* Header of new quota format */ |
98 | struct v2_disk_dqheader { |
99 | __le32 dqh_magic; /* Magic number identifying file */ |
100 | __le32 dqh_version; /* File version */ |
101 | }; |
102 | |
103 | static int v1_check_quota_file(struct super_block *sb, int type) |
104 | { |
105 | struct inode *inode = sb_dqopt(sb)->files[type]; |
106 | ulong blocks; |
107 | size_t off; |
108 | struct v2_disk_dqheader dqhead; |
109 | ssize_t size; |
110 | loff_t isize; |
111 | static const uint quota_magics[] = V2_INITQMAGICS; |
112 | |
113 | isize = i_size_read(inode); |
114 | if (!isize) |
115 | return 0; |
116 | blocks = isize >> BLOCK_SIZE_BITS; |
117 | off = isize & (BLOCK_SIZE - 1); |
118 | if ((blocks % sizeof(struct v1_disk_dqblk) * BLOCK_SIZE + off) % sizeof(struct v1_disk_dqblk)) |
119 | return 0; |
120 | /* Doublecheck whether we didn't get file with new format - with old quotactl() this could happen */ |
121 | size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0); |
122 | if (size != sizeof(struct v2_disk_dqheader)) |
123 | return 1; /* Probably not new format */ |
124 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type]) |
125 | return 1; /* Definitely not new format */ |
126 | printk(KERN_INFO "VFS: %s: Refusing to turn on old quota format on given file. It probably contains newer quota format.\n", sb->s_id); |
127 | return 0; /* Seems like a new format file -> refuse it */ |
128 | } |
129 | |
130 | static int v1_read_file_info(struct super_block *sb, int type) |
131 | { |
132 | struct quota_info *dqopt = sb_dqopt(sb); |
133 | struct v1_disk_dqblk dqblk; |
134 | int ret; |
135 | |
136 | if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) { |
137 | if (ret >= 0) |
138 | ret = -EIO; |
139 | goto out; |
140 | } |
141 | ret = 0; |
142 | dqopt->info[type].dqi_igrace = dqblk.dqb_itime ? dqblk.dqb_itime : MAX_IQ_TIME; |
143 | dqopt->info[type].dqi_bgrace = dqblk.dqb_btime ? dqblk.dqb_btime : MAX_DQ_TIME; |
144 | out: |
145 | return ret; |
146 | } |
147 | |
148 | static int v1_write_file_info(struct super_block *sb, int type) |
149 | { |
150 | struct quota_info *dqopt = sb_dqopt(sb); |
151 | struct v1_disk_dqblk dqblk; |
152 | int ret; |
153 | |
154 | dqopt->info[type].dqi_flags &= ~DQF_INFO_DIRTY; |
155 | if ((ret = sb->s_op->quota_read(sb, type, (char *)&dqblk, |
156 | sizeof(struct v1_disk_dqblk), v1_dqoff(0))) != sizeof(struct v1_disk_dqblk)) { |
157 | if (ret >= 0) |
158 | ret = -EIO; |
159 | goto out; |
160 | } |
161 | dqblk.dqb_itime = dqopt->info[type].dqi_igrace; |
162 | dqblk.dqb_btime = dqopt->info[type].dqi_bgrace; |
163 | ret = sb->s_op->quota_write(sb, type, (char *)&dqblk, |
164 | sizeof(struct v1_disk_dqblk), v1_dqoff(0)); |
165 | if (ret == sizeof(struct v1_disk_dqblk)) |
166 | ret = 0; |
167 | else if (ret > 0) |
168 | ret = -EIO; |
169 | out: |
170 | return ret; |
171 | } |
172 | |
173 | static struct quota_format_ops v1_format_ops = { |
174 | .check_quota_file = v1_check_quota_file, |
175 | .read_file_info = v1_read_file_info, |
176 | .write_file_info = v1_write_file_info, |
177 | .free_file_info = NULL, |
178 | .read_dqblk = v1_read_dqblk, |
179 | .commit_dqblk = v1_commit_dqblk, |
180 | }; |
181 | |
182 | static struct quota_format_type v1_quota_format = { |
183 | .qf_fmt_id = QFMT_VFS_OLD, |
184 | .qf_ops = &v1_format_ops, |
185 | .qf_owner = THIS_MODULE |
186 | }; |
187 | |
188 | static int __init init_v1_quota_format(void) |
189 | { |
190 | return register_quota_format(&v1_quota_format); |
191 | } |
192 | |
193 | static void __exit exit_v1_quota_format(void) |
194 | { |
195 | unregister_quota_format(&v1_quota_format); |
196 | } |
197 | |
198 | module_init(init_v1_quota_format); |
199 | module_exit(exit_v1_quota_format); |
200 |