Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/kernel.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/slab.h> |
Jan Kara | 74abb98 | 2008-07-25 01:46:51 -0700 | [diff] [blame] | 13 | #include <linux/quotaops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
| 15 | #include <asm/byteorder.h> |
| 16 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 17 | #include "quota_tree.h" |
Jan Kara | cf770c1 | 2008-09-21 23:17:53 +0200 | [diff] [blame] | 18 | #include "quotaio_v2.h" |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | MODULE_AUTHOR("Jan Kara"); |
| 21 | MODULE_DESCRIPTION("Quota format v2 support"); |
| 22 | MODULE_LICENSE("GPL"); |
| 23 | |
| 24 | #define __QUOTA_V2_PARANOIA |
| 25 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 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 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Jan Kara | 1209546 | 2008-08-20 14:45:12 +0200 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 57 | size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0); |
| 58 | if (size != sizeof(struct v2_disk_dqheader)) { |
Andrew Morton | 8c17e1e | 2006-02-03 03:04:03 -0800 | [diff] [blame] | 59 | printk("quota_v2: failed read expected=%zd got=%zd\n", |
Valdis.Kletnieks@vt.edu | 3135806 | 2006-01-14 13:21:10 -0800 | [diff] [blame] | 60 | sizeof(struct v2_disk_dqheader), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | return 0; |
| 62 | } |
| 63 | if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || |
| 64 | le32_to_cpu(dqhead.dqh_version) != quota_versions[type]) |
| 65 | return 0; |
| 66 | return 1; |
| 67 | } |
| 68 | |
| 69 | /* Read information header from quota file */ |
| 70 | static int v2_read_file_info(struct super_block *sb, int type) |
| 71 | { |
| 72 | struct v2_disk_dqinfo dinfo; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 73 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | ssize_t size; |
| 75 | |
| 76 | size = sb->s_op->quota_read(sb, type, (char *)&dinfo, |
| 77 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); |
| 78 | if (size != sizeof(struct v2_disk_dqinfo)) { |
| 79 | printk(KERN_WARNING "Can't read info structure on device %s.\n", |
| 80 | sb->s_id); |
| 81 | return -1; |
| 82 | } |
Andrew Perepechko | 338bf9a | 2008-04-28 02:14:31 -0700 | [diff] [blame] | 83 | /* limits are stored as unsigned 32-bit data */ |
| 84 | info->dqi_maxblimit = 0xffffffff; |
| 85 | info->dqi_maxilimit = 0xffffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); |
| 87 | info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); |
| 88 | info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 89 | info->u.v2_i.i.dqi_sb = sb; |
| 90 | info->u.v2_i.i.dqi_type = type; |
| 91 | info->u.v2_i.i.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); |
| 92 | info->u.v2_i.i.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); |
| 93 | info->u.v2_i.i.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); |
| 94 | info->u.v2_i.i.dqi_blocksize_bits = V2_DQBLKSIZE_BITS; |
| 95 | info->u.v2_i.i.dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; |
| 96 | info->u.v2_i.i.dqi_qtree_depth = qtree_depth(&info->u.v2_i.i); |
| 97 | info->u.v2_i.i.dqi_entry_size = sizeof(struct v2_disk_dqblk); |
| 98 | info->u.v2_i.i.dqi_ops = &v2_qtree_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* Write information header to quota file */ |
| 103 | static int v2_write_file_info(struct super_block *sb, int type) |
| 104 | { |
| 105 | struct v2_disk_dqinfo dinfo; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 106 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | ssize_t size; |
| 108 | |
| 109 | spin_lock(&dq_data_lock); |
| 110 | info->dqi_flags &= ~DQF_INFO_DIRTY; |
| 111 | dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); |
| 112 | dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); |
| 113 | dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); |
| 114 | spin_unlock(&dq_data_lock); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 115 | dinfo.dqi_blocks = cpu_to_le32(info->u.v2_i.i.dqi_blocks); |
| 116 | dinfo.dqi_free_blk = cpu_to_le32(info->u.v2_i.i.dqi_free_blk); |
| 117 | dinfo.dqi_free_entry = cpu_to_le32(info->u.v2_i.i.dqi_free_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | size = sb->s_op->quota_write(sb, type, (char *)&dinfo, |
| 119 | sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); |
| 120 | if (size != sizeof(struct v2_disk_dqinfo)) { |
| 121 | printk(KERN_WARNING "Can't write info structure on device %s.\n", |
| 122 | sb->s_id); |
| 123 | return -1; |
| 124 | } |
| 125 | return 0; |
| 126 | } |
| 127 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 128 | static void v2_disk2memdqb(struct dquot *dquot, void *dp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 130 | struct v2_disk_dqblk *d = dp, empty; |
| 131 | struct mem_dqblk *m = &dquot->dq_dqb; |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); |
| 134 | m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); |
| 135 | m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); |
| 136 | m->dqb_itime = le64_to_cpu(d->dqb_itime); |
Jan Kara | 1209546 | 2008-08-20 14:45:12 +0200 | [diff] [blame] | 137 | m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); |
| 138 | m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); |
| 140 | m->dqb_btime = le64_to_cpu(d->dqb_btime); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 141 | /* We need to escape back all-zero structure */ |
| 142 | memset(&empty, 0, sizeof(struct v2_disk_dqblk)); |
| 143 | empty.dqb_itime = cpu_to_le64(1); |
| 144 | if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk))) |
| 145 | m->dqb_itime = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 148 | static void v2_mem2diskdqb(void *dp, struct dquot *dquot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 150 | struct v2_disk_dqblk *d = dp; |
| 151 | struct mem_dqblk *m = &dquot->dq_dqb; |
| 152 | struct qtree_mem_dqinfo *info = |
| 153 | &sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i; |
| 154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); |
| 156 | d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); |
| 157 | d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); |
| 158 | d->dqb_itime = cpu_to_le64(m->dqb_itime); |
Jan Kara | cf770c1 | 2008-09-21 23:17:53 +0200 | [diff] [blame] | 159 | d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); |
| 160 | d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); |
| 162 | d->dqb_btime = cpu_to_le64(m->dqb_btime); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 163 | d->dqb_id = cpu_to_le32(dquot->dq_id); |
| 164 | if (qtree_entry_unused(info, dp)) |
| 165 | d->dqb_itime = cpu_to_le64(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 168 | static int v2_is_id(void *dp, struct dquot *dquot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | { |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 170 | struct v2_disk_dqblk *d = dp; |
| 171 | struct qtree_mem_dqinfo *info = |
| 172 | &sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 174 | if (qtree_entry_unused(info, dp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | return 0; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 176 | return le32_to_cpu(d->dqb_id) == dquot->dq_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | static int v2_read_dquot(struct dquot *dquot) |
| 180 | { |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 181 | return qtree_read_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 184 | static int v2_write_dquot(struct dquot *dquot) |
| 185 | { |
| 186 | return qtree_write_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot); |
| 187 | } |
| 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | static int v2_release_dquot(struct dquot *dquot) |
| 190 | { |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame^] | 191 | return qtree_release_dquot(&sb_dqinfo(dquot->dq_sb, dquot->dq_type)->u.v2_i.i, dquot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | static struct quota_format_ops v2_format_ops = { |
| 195 | .check_quota_file = v2_check_quota_file, |
| 196 | .read_file_info = v2_read_file_info, |
| 197 | .write_file_info = v2_write_file_info, |
| 198 | .free_file_info = NULL, |
| 199 | .read_dqblk = v2_read_dquot, |
| 200 | .commit_dqblk = v2_write_dquot, |
| 201 | .release_dqblk = v2_release_dquot, |
| 202 | }; |
| 203 | |
| 204 | static struct quota_format_type v2_quota_format = { |
| 205 | .qf_fmt_id = QFMT_VFS_V0, |
| 206 | .qf_ops = &v2_format_ops, |
| 207 | .qf_owner = THIS_MODULE |
| 208 | }; |
| 209 | |
| 210 | static int __init init_v2_quota_format(void) |
| 211 | { |
| 212 | return register_quota_format(&v2_quota_format); |
| 213 | } |
| 214 | |
| 215 | static void __exit exit_v2_quota_format(void) |
| 216 | { |
| 217 | unregister_quota_format(&v2_quota_format); |
| 218 | } |
| 219 | |
| 220 | module_init(init_v2_quota_format); |
| 221 | module_exit(exit_v2_quota_format); |