Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [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> |
| 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 | |
| 19 | MODULE_AUTHOR("Jan Kara"); |
| 20 | MODULE_DESCRIPTION("Quota trie support"); |
| 21 | MODULE_LICENSE("GPL"); |
| 22 | |
| 23 | #define __QUOTA_QT_PARANOIA |
| 24 | |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 25 | static int get_index(struct qtree_mem_dqinfo *info, qid_t id, int depth) |
| 26 | { |
| 27 | unsigned int epb = info->dqi_usable_bs >> 2; |
| 28 | |
| 29 | depth = info->dqi_qtree_depth - depth - 1; |
| 30 | while (depth--) |
| 31 | id /= epb; |
| 32 | return id % epb; |
| 33 | } |
| 34 | |
| 35 | /* Number of entries in one blocks */ |
Jan Kara | 7a2435d | 2009-01-27 01:47:11 +0100 | [diff] [blame] | 36 | static int qtree_dqstr_in_blk(struct qtree_mem_dqinfo *info) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 37 | { |
| 38 | return (info->dqi_usable_bs - sizeof(struct qt_disk_dqdbheader)) |
| 39 | / info->dqi_entry_size; |
| 40 | } |
| 41 | |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 42 | static char *getdqbuf(size_t size) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 43 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 44 | char *buf = kmalloc(size, GFP_NOFS); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 45 | if (!buf) |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 46 | printk(KERN_WARNING |
| 47 | "VFS: Not enough memory for quota buffers.\n"); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 48 | return buf; |
| 49 | } |
| 50 | |
Jan Kara | 7a2435d | 2009-01-27 01:47:11 +0100 | [diff] [blame] | 51 | static ssize_t read_blk(struct qtree_mem_dqinfo *info, uint blk, char *buf) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 52 | { |
| 53 | struct super_block *sb = info->dqi_sb; |
| 54 | |
| 55 | memset(buf, 0, info->dqi_usable_bs); |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 56 | return sb->s_op->quota_read(sb, info->dqi_type, buf, |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 57 | info->dqi_usable_bs, blk << info->dqi_blocksize_bits); |
| 58 | } |
| 59 | |
Jan Kara | 7a2435d | 2009-01-27 01:47:11 +0100 | [diff] [blame] | 60 | static ssize_t write_blk(struct qtree_mem_dqinfo *info, uint blk, char *buf) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 61 | { |
| 62 | struct super_block *sb = info->dqi_sb; |
Jiaying Zhang | 1907131 | 2010-05-17 18:36:03 +0200 | [diff] [blame] | 63 | ssize_t ret; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 64 | |
Jiaying Zhang | 1907131 | 2010-05-17 18:36:03 +0200 | [diff] [blame] | 65 | ret = sb->s_op->quota_write(sb, info->dqi_type, buf, |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 66 | info->dqi_usable_bs, blk << info->dqi_blocksize_bits); |
Jiaying Zhang | 1907131 | 2010-05-17 18:36:03 +0200 | [diff] [blame] | 67 | if (ret != info->dqi_usable_bs) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 68 | quota_error(sb, "dquota write failed"); |
Jiaying Zhang | 1907131 | 2010-05-17 18:36:03 +0200 | [diff] [blame] | 69 | if (ret >= 0) |
| 70 | ret = -EIO; |
| 71 | } |
| 72 | return ret; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | /* Remove empty block from list and return it */ |
| 76 | static int get_free_dqblk(struct qtree_mem_dqinfo *info) |
| 77 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 78 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 79 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
| 80 | int ret, blk; |
| 81 | |
| 82 | if (!buf) |
| 83 | return -ENOMEM; |
| 84 | if (info->dqi_free_blk) { |
| 85 | blk = info->dqi_free_blk; |
| 86 | ret = read_blk(info, blk, buf); |
| 87 | if (ret < 0) |
| 88 | goto out_buf; |
| 89 | info->dqi_free_blk = le32_to_cpu(dh->dqdh_next_free); |
| 90 | } |
| 91 | else { |
| 92 | memset(buf, 0, info->dqi_usable_bs); |
| 93 | /* Assure block allocation... */ |
| 94 | ret = write_blk(info, info->dqi_blocks, buf); |
| 95 | if (ret < 0) |
| 96 | goto out_buf; |
| 97 | blk = info->dqi_blocks++; |
| 98 | } |
| 99 | mark_info_dirty(info->dqi_sb, info->dqi_type); |
| 100 | ret = blk; |
| 101 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 102 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | /* Insert empty block to the list */ |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 107 | static int put_free_dqblk(struct qtree_mem_dqinfo *info, char *buf, uint blk) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 108 | { |
| 109 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
| 110 | int err; |
| 111 | |
| 112 | dh->dqdh_next_free = cpu_to_le32(info->dqi_free_blk); |
| 113 | dh->dqdh_prev_free = cpu_to_le32(0); |
| 114 | dh->dqdh_entries = cpu_to_le16(0); |
| 115 | err = write_blk(info, blk, buf); |
| 116 | if (err < 0) |
| 117 | return err; |
| 118 | info->dqi_free_blk = blk; |
| 119 | mark_info_dirty(info->dqi_sb, info->dqi_type); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | /* Remove given block from the list of blocks with free entries */ |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 124 | static int remove_free_dqentry(struct qtree_mem_dqinfo *info, char *buf, |
| 125 | uint blk) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 126 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 127 | char *tmpbuf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 128 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
| 129 | uint nextblk = le32_to_cpu(dh->dqdh_next_free); |
| 130 | uint prevblk = le32_to_cpu(dh->dqdh_prev_free); |
| 131 | int err; |
| 132 | |
| 133 | if (!tmpbuf) |
| 134 | return -ENOMEM; |
| 135 | if (nextblk) { |
| 136 | err = read_blk(info, nextblk, tmpbuf); |
| 137 | if (err < 0) |
| 138 | goto out_buf; |
| 139 | ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = |
| 140 | dh->dqdh_prev_free; |
| 141 | err = write_blk(info, nextblk, tmpbuf); |
| 142 | if (err < 0) |
| 143 | goto out_buf; |
| 144 | } |
| 145 | if (prevblk) { |
| 146 | err = read_blk(info, prevblk, tmpbuf); |
| 147 | if (err < 0) |
| 148 | goto out_buf; |
| 149 | ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_next_free = |
| 150 | dh->dqdh_next_free; |
| 151 | err = write_blk(info, prevblk, tmpbuf); |
| 152 | if (err < 0) |
| 153 | goto out_buf; |
| 154 | } else { |
| 155 | info->dqi_free_entry = nextblk; |
| 156 | mark_info_dirty(info->dqi_sb, info->dqi_type); |
| 157 | } |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 158 | kfree(tmpbuf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 159 | dh->dqdh_next_free = dh->dqdh_prev_free = cpu_to_le32(0); |
| 160 | /* No matter whether write succeeds block is out of list */ |
| 161 | if (write_blk(info, blk, buf) < 0) |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 162 | quota_error(info->dqi_sb, "Can't write block (%u) " |
| 163 | "with free entries", blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 164 | return 0; |
| 165 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 166 | kfree(tmpbuf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 167 | return err; |
| 168 | } |
| 169 | |
| 170 | /* Insert given block to the beginning of list with free entries */ |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 171 | static int insert_free_dqentry(struct qtree_mem_dqinfo *info, char *buf, |
| 172 | uint blk) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 173 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 174 | char *tmpbuf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 175 | struct qt_disk_dqdbheader *dh = (struct qt_disk_dqdbheader *)buf; |
| 176 | int err; |
| 177 | |
| 178 | if (!tmpbuf) |
| 179 | return -ENOMEM; |
| 180 | dh->dqdh_next_free = cpu_to_le32(info->dqi_free_entry); |
| 181 | dh->dqdh_prev_free = cpu_to_le32(0); |
| 182 | err = write_blk(info, blk, buf); |
| 183 | if (err < 0) |
| 184 | goto out_buf; |
| 185 | if (info->dqi_free_entry) { |
| 186 | err = read_blk(info, info->dqi_free_entry, tmpbuf); |
| 187 | if (err < 0) |
| 188 | goto out_buf; |
| 189 | ((struct qt_disk_dqdbheader *)tmpbuf)->dqdh_prev_free = |
| 190 | cpu_to_le32(blk); |
| 191 | err = write_blk(info, info->dqi_free_entry, tmpbuf); |
| 192 | if (err < 0) |
| 193 | goto out_buf; |
| 194 | } |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 195 | kfree(tmpbuf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 196 | info->dqi_free_entry = blk; |
| 197 | mark_info_dirty(info->dqi_sb, info->dqi_type); |
| 198 | return 0; |
| 199 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 200 | kfree(tmpbuf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 201 | return err; |
| 202 | } |
| 203 | |
| 204 | /* Is the entry in the block free? */ |
| 205 | int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk) |
| 206 | { |
| 207 | int i; |
| 208 | |
| 209 | for (i = 0; i < info->dqi_entry_size; i++) |
| 210 | if (disk[i]) |
| 211 | return 0; |
| 212 | return 1; |
| 213 | } |
| 214 | EXPORT_SYMBOL(qtree_entry_unused); |
| 215 | |
| 216 | /* Find space for dquot */ |
| 217 | static uint find_free_dqentry(struct qtree_mem_dqinfo *info, |
| 218 | struct dquot *dquot, int *err) |
| 219 | { |
| 220 | uint blk, i; |
| 221 | struct qt_disk_dqdbheader *dh; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 222 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 223 | char *ddquot; |
| 224 | |
| 225 | *err = 0; |
| 226 | if (!buf) { |
| 227 | *err = -ENOMEM; |
| 228 | return 0; |
| 229 | } |
| 230 | dh = (struct qt_disk_dqdbheader *)buf; |
| 231 | if (info->dqi_free_entry) { |
| 232 | blk = info->dqi_free_entry; |
| 233 | *err = read_blk(info, blk, buf); |
| 234 | if (*err < 0) |
| 235 | goto out_buf; |
| 236 | } else { |
| 237 | blk = get_free_dqblk(info); |
| 238 | if ((int)blk < 0) { |
| 239 | *err = blk; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 240 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 241 | return 0; |
| 242 | } |
| 243 | memset(buf, 0, info->dqi_usable_bs); |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 244 | /* This is enough as the block is already zeroed and the entry |
| 245 | * list is empty... */ |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 246 | info->dqi_free_entry = blk; |
| 247 | mark_info_dirty(dquot->dq_sb, dquot->dq_type); |
| 248 | } |
| 249 | /* Block will be full? */ |
| 250 | if (le16_to_cpu(dh->dqdh_entries) + 1 >= qtree_dqstr_in_blk(info)) { |
| 251 | *err = remove_free_dqentry(info, buf, blk); |
| 252 | if (*err < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 253 | quota_error(dquot->dq_sb, "Can't remove block (%u) " |
| 254 | "from entry free list", blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 255 | goto out_buf; |
| 256 | } |
| 257 | } |
| 258 | le16_add_cpu(&dh->dqdh_entries, 1); |
| 259 | /* Find free structure in block */ |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 260 | ddquot = buf + sizeof(struct qt_disk_dqdbheader); |
| 261 | for (i = 0; i < qtree_dqstr_in_blk(info); i++) { |
| 262 | if (qtree_entry_unused(info, ddquot)) |
| 263 | break; |
| 264 | ddquot += info->dqi_entry_size; |
| 265 | } |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 266 | #ifdef __QUOTA_QT_PARANOIA |
| 267 | if (i == qtree_dqstr_in_blk(info)) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 268 | quota_error(dquot->dq_sb, "Data block full but it shouldn't"); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 269 | *err = -EIO; |
| 270 | goto out_buf; |
| 271 | } |
| 272 | #endif |
| 273 | *err = write_blk(info, blk, buf); |
| 274 | if (*err < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 275 | quota_error(dquot->dq_sb, "Can't write quota data block %u", |
| 276 | blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 277 | goto out_buf; |
| 278 | } |
| 279 | dquot->dq_off = (blk << info->dqi_blocksize_bits) + |
| 280 | sizeof(struct qt_disk_dqdbheader) + |
| 281 | i * info->dqi_entry_size; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 282 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 283 | return blk; |
| 284 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 285 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | /* Insert reference to structure into the trie */ |
| 290 | static int do_insert_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot, |
| 291 | uint *treeblk, int depth) |
| 292 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 293 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 294 | int ret = 0, newson = 0, newact = 0; |
| 295 | __le32 *ref; |
| 296 | uint newblk; |
| 297 | |
| 298 | if (!buf) |
| 299 | return -ENOMEM; |
| 300 | if (!*treeblk) { |
| 301 | ret = get_free_dqblk(info); |
| 302 | if (ret < 0) |
| 303 | goto out_buf; |
| 304 | *treeblk = ret; |
| 305 | memset(buf, 0, info->dqi_usable_bs); |
| 306 | newact = 1; |
| 307 | } else { |
| 308 | ret = read_blk(info, *treeblk, buf); |
| 309 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 310 | quota_error(dquot->dq_sb, "Can't read tree quota " |
| 311 | "block %u", *treeblk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 312 | goto out_buf; |
| 313 | } |
| 314 | } |
| 315 | ref = (__le32 *)buf; |
| 316 | newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]); |
| 317 | if (!newblk) |
| 318 | newson = 1; |
| 319 | if (depth == info->dqi_qtree_depth - 1) { |
| 320 | #ifdef __QUOTA_QT_PARANOIA |
| 321 | if (newblk) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 322 | quota_error(dquot->dq_sb, "Inserting already present " |
| 323 | "quota entry (block %u)", |
| 324 | le32_to_cpu(ref[get_index(info, |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 325 | dquot->dq_id, depth)])); |
| 326 | ret = -EIO; |
| 327 | goto out_buf; |
| 328 | } |
| 329 | #endif |
| 330 | newblk = find_free_dqentry(info, dquot, &ret); |
| 331 | } else { |
| 332 | ret = do_insert_tree(info, dquot, &newblk, depth+1); |
| 333 | } |
| 334 | if (newson && ret >= 0) { |
| 335 | ref[get_index(info, dquot->dq_id, depth)] = |
| 336 | cpu_to_le32(newblk); |
| 337 | ret = write_blk(info, *treeblk, buf); |
| 338 | } else if (newact && ret < 0) { |
| 339 | put_free_dqblk(info, buf, *treeblk); |
| 340 | } |
| 341 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 342 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 343 | return ret; |
| 344 | } |
| 345 | |
| 346 | /* Wrapper for inserting quota structure into tree */ |
| 347 | static inline int dq_insert_tree(struct qtree_mem_dqinfo *info, |
| 348 | struct dquot *dquot) |
| 349 | { |
| 350 | int tmp = QT_TREEOFF; |
| 351 | return do_insert_tree(info, dquot, &tmp, 0); |
| 352 | } |
| 353 | |
| 354 | /* |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 355 | * We don't have to be afraid of deadlocks as we never have quotas on quota |
| 356 | * files... |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 357 | */ |
| 358 | int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) |
| 359 | { |
| 360 | int type = dquot->dq_type; |
| 361 | struct super_block *sb = dquot->dq_sb; |
| 362 | ssize_t ret; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 363 | char *ddquot = getdqbuf(info->dqi_entry_size); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 364 | |
| 365 | if (!ddquot) |
| 366 | return -ENOMEM; |
| 367 | |
| 368 | /* dq_off is guarded by dqio_mutex */ |
| 369 | if (!dquot->dq_off) { |
| 370 | ret = dq_insert_tree(info, dquot); |
| 371 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 372 | quota_error(sb, "Error %zd occurred while creating " |
| 373 | "quota", ret); |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 374 | kfree(ddquot); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 375 | return ret; |
| 376 | } |
| 377 | } |
| 378 | spin_lock(&dq_data_lock); |
| 379 | info->dqi_ops->mem2disk_dqblk(ddquot, dquot); |
| 380 | spin_unlock(&dq_data_lock); |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 381 | ret = sb->s_op->quota_write(sb, type, ddquot, info->dqi_entry_size, |
| 382 | dquot->dq_off); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 383 | if (ret != info->dqi_entry_size) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 384 | quota_error(sb, "dquota write failed"); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 385 | if (ret >= 0) |
| 386 | ret = -ENOSPC; |
| 387 | } else { |
| 388 | ret = 0; |
| 389 | } |
Dmitry Monakhov | dde9588 | 2010-04-26 20:03:33 +0400 | [diff] [blame] | 390 | dqstats_inc(DQST_WRITES); |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 391 | kfree(ddquot); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 392 | |
| 393 | return ret; |
| 394 | } |
| 395 | EXPORT_SYMBOL(qtree_write_dquot); |
| 396 | |
| 397 | /* Free dquot entry in data block */ |
| 398 | static int free_dqentry(struct qtree_mem_dqinfo *info, struct dquot *dquot, |
| 399 | uint blk) |
| 400 | { |
| 401 | struct qt_disk_dqdbheader *dh; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 402 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 403 | int ret = 0; |
| 404 | |
| 405 | if (!buf) |
| 406 | return -ENOMEM; |
| 407 | if (dquot->dq_off >> info->dqi_blocksize_bits != blk) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 408 | quota_error(dquot->dq_sb, "Quota structure has offset to " |
| 409 | "other block (%u) than it should (%u)", blk, |
| 410 | (uint)(dquot->dq_off >> info->dqi_blocksize_bits)); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 411 | goto out_buf; |
| 412 | } |
| 413 | ret = read_blk(info, blk, buf); |
| 414 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 415 | quota_error(dquot->dq_sb, "Can't read quota data block %u", |
| 416 | blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 417 | goto out_buf; |
| 418 | } |
| 419 | dh = (struct qt_disk_dqdbheader *)buf; |
| 420 | le16_add_cpu(&dh->dqdh_entries, -1); |
| 421 | if (!le16_to_cpu(dh->dqdh_entries)) { /* Block got free? */ |
| 422 | ret = remove_free_dqentry(info, buf, blk); |
| 423 | if (ret >= 0) |
| 424 | ret = put_free_dqblk(info, buf, blk); |
| 425 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 426 | quota_error(dquot->dq_sb, "Can't move quota data block " |
| 427 | "(%u) to free list", blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 428 | goto out_buf; |
| 429 | } |
| 430 | } else { |
| 431 | memset(buf + |
| 432 | (dquot->dq_off & ((1 << info->dqi_blocksize_bits) - 1)), |
| 433 | 0, info->dqi_entry_size); |
| 434 | if (le16_to_cpu(dh->dqdh_entries) == |
| 435 | qtree_dqstr_in_blk(info) - 1) { |
| 436 | /* Insert will write block itself */ |
| 437 | ret = insert_free_dqentry(info, buf, blk); |
| 438 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 439 | quota_error(dquot->dq_sb, "Can't insert quota " |
| 440 | "data block (%u) to free entry list", blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 441 | goto out_buf; |
| 442 | } |
| 443 | } else { |
| 444 | ret = write_blk(info, blk, buf); |
| 445 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 446 | quota_error(dquot->dq_sb, "Can't write quota " |
| 447 | "data block %u", blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 448 | goto out_buf; |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | dquot->dq_off = 0; /* Quota is now unattached */ |
| 453 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 454 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 455 | return ret; |
| 456 | } |
| 457 | |
| 458 | /* Remove reference to dquot from tree */ |
| 459 | static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot, |
| 460 | uint *blk, int depth) |
| 461 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 462 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 463 | int ret = 0; |
| 464 | uint newblk; |
| 465 | __le32 *ref = (__le32 *)buf; |
| 466 | |
| 467 | if (!buf) |
| 468 | return -ENOMEM; |
| 469 | ret = read_blk(info, *blk, buf); |
| 470 | if (ret < 0) { |
Joe Perches | 055adcb | 2010-11-23 18:49:54 -0800 | [diff] [blame^] | 471 | quota_error(dquot->dq_sb, "Can't read quota data block %u", |
| 472 | *blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 473 | goto out_buf; |
| 474 | } |
| 475 | newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]); |
| 476 | if (depth == info->dqi_qtree_depth - 1) { |
| 477 | ret = free_dqentry(info, dquot, newblk); |
| 478 | newblk = 0; |
| 479 | } else { |
| 480 | ret = remove_tree(info, dquot, &newblk, depth+1); |
| 481 | } |
| 482 | if (ret >= 0 && !newblk) { |
| 483 | int i; |
| 484 | ref[get_index(info, dquot->dq_id, depth)] = cpu_to_le32(0); |
| 485 | /* Block got empty? */ |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 486 | for (i = 0; i < (info->dqi_usable_bs >> 2) && !ref[i]; i++) |
| 487 | ; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 488 | /* Don't put the root block into the free block list */ |
| 489 | if (i == (info->dqi_usable_bs >> 2) |
| 490 | && *blk != QT_TREEOFF) { |
| 491 | put_free_dqblk(info, buf, *blk); |
| 492 | *blk = 0; |
| 493 | } else { |
| 494 | ret = write_blk(info, *blk, buf); |
| 495 | if (ret < 0) |
Joe Perches | 055adcb | 2010-11-23 18:49:54 -0800 | [diff] [blame^] | 496 | quota_error(dquot->dq_sb, |
| 497 | "Can't write quota tree block %u", |
| 498 | *blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 499 | } |
| 500 | } |
| 501 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 502 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 503 | return ret; |
| 504 | } |
| 505 | |
| 506 | /* Delete dquot from tree */ |
| 507 | int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) |
| 508 | { |
| 509 | uint tmp = QT_TREEOFF; |
| 510 | |
| 511 | if (!dquot->dq_off) /* Even not allocated? */ |
| 512 | return 0; |
| 513 | return remove_tree(info, dquot, &tmp, 0); |
| 514 | } |
| 515 | EXPORT_SYMBOL(qtree_delete_dquot); |
| 516 | |
| 517 | /* Find entry in block */ |
| 518 | static loff_t find_block_dqentry(struct qtree_mem_dqinfo *info, |
| 519 | struct dquot *dquot, uint blk) |
| 520 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 521 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 522 | loff_t ret = 0; |
| 523 | int i; |
| 524 | char *ddquot; |
| 525 | |
| 526 | if (!buf) |
| 527 | return -ENOMEM; |
| 528 | ret = read_blk(info, blk, buf); |
| 529 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 530 | quota_error(dquot->dq_sb, "Can't read quota tree " |
| 531 | "block %u", blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 532 | goto out_buf; |
| 533 | } |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 534 | ddquot = buf + sizeof(struct qt_disk_dqdbheader); |
| 535 | for (i = 0; i < qtree_dqstr_in_blk(info); i++) { |
| 536 | if (info->dqi_ops->is_id(ddquot, dquot)) |
| 537 | break; |
| 538 | ddquot += info->dqi_entry_size; |
| 539 | } |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 540 | if (i == qtree_dqstr_in_blk(info)) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 541 | quota_error(dquot->dq_sb, "Quota for id %u referenced " |
| 542 | "but not present", dquot->dq_id); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 543 | ret = -EIO; |
| 544 | goto out_buf; |
| 545 | } else { |
| 546 | ret = (blk << info->dqi_blocksize_bits) + sizeof(struct |
| 547 | qt_disk_dqdbheader) + i * info->dqi_entry_size; |
| 548 | } |
| 549 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 550 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 551 | return ret; |
| 552 | } |
| 553 | |
| 554 | /* Find entry for given id in the tree */ |
| 555 | static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info, |
| 556 | struct dquot *dquot, uint blk, int depth) |
| 557 | { |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 558 | char *buf = getdqbuf(info->dqi_usable_bs); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 559 | loff_t ret = 0; |
| 560 | __le32 *ref = (__le32 *)buf; |
| 561 | |
| 562 | if (!buf) |
| 563 | return -ENOMEM; |
| 564 | ret = read_blk(info, blk, buf); |
| 565 | if (ret < 0) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 566 | quota_error(dquot->dq_sb, "Can't read quota tree block %u", |
| 567 | blk); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 568 | goto out_buf; |
| 569 | } |
| 570 | ret = 0; |
| 571 | blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]); |
| 572 | if (!blk) /* No reference? */ |
| 573 | goto out_buf; |
| 574 | if (depth < info->dqi_qtree_depth - 1) |
| 575 | ret = find_tree_dqentry(info, dquot, blk, depth+1); |
| 576 | else |
| 577 | ret = find_block_dqentry(info, dquot, blk); |
| 578 | out_buf: |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 579 | kfree(buf); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 580 | return ret; |
| 581 | } |
| 582 | |
| 583 | /* Find entry for given id in the tree - wrapper function */ |
| 584 | static inline loff_t find_dqentry(struct qtree_mem_dqinfo *info, |
| 585 | struct dquot *dquot) |
| 586 | { |
| 587 | return find_tree_dqentry(info, dquot, QT_TREEOFF, 0); |
| 588 | } |
| 589 | |
| 590 | int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) |
| 591 | { |
| 592 | int type = dquot->dq_type; |
| 593 | struct super_block *sb = dquot->dq_sb; |
| 594 | loff_t offset; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 595 | char *ddquot; |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 596 | int ret = 0; |
| 597 | |
| 598 | #ifdef __QUOTA_QT_PARANOIA |
| 599 | /* Invalidated quota? */ |
| 600 | if (!sb_dqopt(dquot->dq_sb)->files[type]) { |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 601 | quota_error(sb, "Quota invalidated while reading!"); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 602 | return -EIO; |
| 603 | } |
| 604 | #endif |
| 605 | /* Do we know offset of the dquot entry in the quota file? */ |
| 606 | if (!dquot->dq_off) { |
| 607 | offset = find_dqentry(info, dquot); |
| 608 | if (offset <= 0) { /* Entry not present? */ |
| 609 | if (offset < 0) |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 610 | quota_error(sb, "Can't read quota structure " |
| 611 | "for id %u", dquot->dq_id); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 612 | dquot->dq_off = 0; |
| 613 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
| 614 | memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk)); |
| 615 | ret = offset; |
| 616 | goto out; |
| 617 | } |
| 618 | dquot->dq_off = offset; |
| 619 | } |
| 620 | ddquot = getdqbuf(info->dqi_entry_size); |
| 621 | if (!ddquot) |
| 622 | return -ENOMEM; |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 623 | ret = sb->s_op->quota_read(sb, type, ddquot, info->dqi_entry_size, |
| 624 | dquot->dq_off); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 625 | if (ret != info->dqi_entry_size) { |
| 626 | if (ret >= 0) |
| 627 | ret = -EIO; |
Jiaying Zhang | fb5ffb0 | 2010-07-20 16:54:43 +0200 | [diff] [blame] | 628 | quota_error(sb, "Error while reading quota structure for id %u", |
| 629 | dquot->dq_id); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 630 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
| 631 | memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk)); |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 632 | kfree(ddquot); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 633 | goto out; |
| 634 | } |
| 635 | spin_lock(&dq_data_lock); |
| 636 | info->dqi_ops->disk2mem_dqblk(dquot, ddquot); |
| 637 | if (!dquot->dq_dqb.dqb_bhardlimit && |
| 638 | !dquot->dq_dqb.dqb_bsoftlimit && |
| 639 | !dquot->dq_dqb.dqb_ihardlimit && |
| 640 | !dquot->dq_dqb.dqb_isoftlimit) |
| 641 | set_bit(DQ_FAKE_B, &dquot->dq_flags); |
| 642 | spin_unlock(&dq_data_lock); |
Jan Kara | d26ac1a | 2009-01-26 16:17:50 +0100 | [diff] [blame] | 643 | kfree(ddquot); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 644 | out: |
Dmitry Monakhov | dde9588 | 2010-04-26 20:03:33 +0400 | [diff] [blame] | 645 | dqstats_inc(DQST_READS); |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 646 | return ret; |
| 647 | } |
| 648 | EXPORT_SYMBOL(qtree_read_dquot); |
| 649 | |
| 650 | /* Check whether dquot should not be deleted. We know we are |
| 651 | * the only one operating on dquot (thanks to dq_lock) */ |
| 652 | int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot) |
| 653 | { |
Jan Kara | 268157b | 2009-01-27 15:47:22 +0100 | [diff] [blame] | 654 | if (test_bit(DQ_FAKE_B, &dquot->dq_flags) && |
| 655 | !(dquot->dq_dqb.dqb_curinodes | dquot->dq_dqb.dqb_curspace)) |
Jan Kara | 1ccd14b | 2008-09-22 05:54:49 +0200 | [diff] [blame] | 656 | return qtree_delete_dquot(info, dquot); |
| 657 | return 0; |
| 658 | } |
| 659 | EXPORT_SYMBOL(qtree_release_dquot); |