Jan Kara | 9e33d69 | 2008-08-25 19:56:50 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Implementation of operations over global quota file |
| 3 | */ |
| 4 | #include <linux/fs.h> |
| 5 | #include <linux/quota.h> |
| 6 | #include <linux/quotaops.h> |
| 7 | #include <linux/dqblk_qtree.h> |
| 8 | |
| 9 | #define MLOG_MASK_PREFIX ML_QUOTA |
| 10 | #include <cluster/masklog.h> |
| 11 | |
| 12 | #include "ocfs2_fs.h" |
| 13 | #include "ocfs2.h" |
| 14 | #include "alloc.h" |
| 15 | #include "inode.h" |
| 16 | #include "journal.h" |
| 17 | #include "file.h" |
| 18 | #include "sysfile.h" |
| 19 | #include "dlmglue.h" |
| 20 | #include "uptodate.h" |
| 21 | #include "quota.h" |
| 22 | |
| 23 | static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp) |
| 24 | { |
| 25 | struct ocfs2_global_disk_dqblk *d = dp; |
| 26 | struct mem_dqblk *m = &dquot->dq_dqb; |
| 27 | |
| 28 | /* Update from disk only entries not set by the admin */ |
| 29 | if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) { |
| 30 | m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); |
| 31 | m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); |
| 32 | } |
| 33 | if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) |
| 34 | m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); |
| 35 | if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) { |
| 36 | m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit); |
| 37 | m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit); |
| 38 | } |
| 39 | if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) |
| 40 | m->dqb_curspace = le64_to_cpu(d->dqb_curspace); |
| 41 | if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags)) |
| 42 | m->dqb_btime = le64_to_cpu(d->dqb_btime); |
| 43 | if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags)) |
| 44 | m->dqb_itime = le64_to_cpu(d->dqb_itime); |
| 45 | OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count); |
| 46 | } |
| 47 | |
| 48 | static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot) |
| 49 | { |
| 50 | struct ocfs2_global_disk_dqblk *d = dp; |
| 51 | struct mem_dqblk *m = &dquot->dq_dqb; |
| 52 | |
| 53 | d->dqb_id = cpu_to_le32(dquot->dq_id); |
| 54 | d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count); |
| 55 | d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); |
| 56 | d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); |
| 57 | d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); |
| 58 | d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit); |
| 59 | d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit); |
| 60 | d->dqb_curspace = cpu_to_le64(m->dqb_curspace); |
| 61 | d->dqb_btime = cpu_to_le64(m->dqb_btime); |
| 62 | d->dqb_itime = cpu_to_le64(m->dqb_itime); |
| 63 | } |
| 64 | |
| 65 | static int ocfs2_global_is_id(void *dp, struct dquot *dquot) |
| 66 | { |
| 67 | struct ocfs2_global_disk_dqblk *d = dp; |
| 68 | struct ocfs2_mem_dqinfo *oinfo = |
| 69 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
| 70 | |
| 71 | if (qtree_entry_unused(&oinfo->dqi_gi, dp)) |
| 72 | return 0; |
| 73 | return le32_to_cpu(d->dqb_id) == dquot->dq_id; |
| 74 | } |
| 75 | |
| 76 | struct qtree_fmt_operations ocfs2_global_ops = { |
| 77 | .mem2disk_dqblk = ocfs2_global_mem2diskdqb, |
| 78 | .disk2mem_dqblk = ocfs2_global_disk2memdqb, |
| 79 | .is_id = ocfs2_global_is_id, |
| 80 | }; |
| 81 | |
| 82 | |
| 83 | struct buffer_head *ocfs2_read_quota_block(struct inode *inode, |
| 84 | int block, int *err) |
| 85 | { |
| 86 | struct buffer_head *tmp = NULL; |
| 87 | |
| 88 | *err = ocfs2_read_virt_blocks(inode, block, 1, &tmp, 0, NULL); |
| 89 | if (*err) |
| 90 | mlog_errno(*err); |
| 91 | |
| 92 | return tmp; |
| 93 | } |
| 94 | |
| 95 | static struct buffer_head *ocfs2_get_quota_block(struct inode *inode, |
| 96 | int block, int *err) |
| 97 | { |
| 98 | u64 pblock, pcount; |
| 99 | struct buffer_head *bh; |
| 100 | |
| 101 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 102 | *err = ocfs2_extent_map_get_blocks(inode, block, &pblock, &pcount, |
| 103 | NULL); |
| 104 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 105 | if (*err) { |
| 106 | mlog_errno(*err); |
| 107 | return NULL; |
| 108 | } |
| 109 | bh = sb_getblk(inode->i_sb, pblock); |
| 110 | if (!bh) { |
| 111 | *err = -EIO; |
| 112 | mlog_errno(*err); |
| 113 | } |
| 114 | return bh; |
| 115 | } |
| 116 | |
| 117 | /* Read data from global quotafile - avoid pagecache and such because we cannot |
| 118 | * afford acquiring the locks... We use quota cluster lock to serialize |
| 119 | * operations. Caller is responsible for acquiring it. */ |
| 120 | ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data, |
| 121 | size_t len, loff_t off) |
| 122 | { |
| 123 | struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; |
| 124 | struct inode *gqinode = oinfo->dqi_gqinode; |
| 125 | loff_t i_size = i_size_read(gqinode); |
| 126 | int offset = off & (sb->s_blocksize - 1); |
| 127 | sector_t blk = off >> sb->s_blocksize_bits; |
| 128 | int err = 0; |
| 129 | struct buffer_head *bh; |
| 130 | size_t toread, tocopy; |
| 131 | |
| 132 | if (off > i_size) |
| 133 | return 0; |
| 134 | if (off + len > i_size) |
| 135 | len = i_size - off; |
| 136 | toread = len; |
| 137 | while (toread > 0) { |
| 138 | tocopy = min((size_t)(sb->s_blocksize - offset), toread); |
| 139 | bh = ocfs2_read_quota_block(gqinode, blk, &err); |
| 140 | if (!bh) { |
| 141 | mlog_errno(err); |
| 142 | return err; |
| 143 | } |
| 144 | memcpy(data, bh->b_data + offset, tocopy); |
| 145 | brelse(bh); |
| 146 | offset = 0; |
| 147 | toread -= tocopy; |
| 148 | data += tocopy; |
| 149 | blk++; |
| 150 | } |
| 151 | return len; |
| 152 | } |
| 153 | |
| 154 | /* Write to quotafile (we know the transaction is already started and has |
| 155 | * enough credits) */ |
| 156 | ssize_t ocfs2_quota_write(struct super_block *sb, int type, |
| 157 | const char *data, size_t len, loff_t off) |
| 158 | { |
| 159 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
| 160 | struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; |
| 161 | struct inode *gqinode = oinfo->dqi_gqinode; |
| 162 | int offset = off & (sb->s_blocksize - 1); |
| 163 | sector_t blk = off >> sb->s_blocksize_bits; |
| 164 | int err = 0, new = 0; |
| 165 | struct buffer_head *bh; |
| 166 | handle_t *handle = journal_current_handle(); |
| 167 | |
| 168 | if (!handle) { |
| 169 | mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled " |
| 170 | "because transaction was not started.\n", |
| 171 | (unsigned long long)off, (unsigned long long)len); |
| 172 | return -EIO; |
| 173 | } |
| 174 | if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) { |
| 175 | WARN_ON(1); |
| 176 | len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset; |
| 177 | } |
| 178 | |
| 179 | mutex_lock_nested(&gqinode->i_mutex, I_MUTEX_QUOTA); |
| 180 | if (gqinode->i_size < off + len) { |
| 181 | down_write(&OCFS2_I(gqinode)->ip_alloc_sem); |
| 182 | err = ocfs2_extend_no_holes(gqinode, off + len, off); |
| 183 | up_write(&OCFS2_I(gqinode)->ip_alloc_sem); |
| 184 | if (err < 0) |
| 185 | goto out; |
| 186 | err = ocfs2_simple_size_update(gqinode, |
| 187 | oinfo->dqi_gqi_bh, |
| 188 | off + len); |
| 189 | if (err < 0) |
| 190 | goto out; |
| 191 | new = 1; |
| 192 | } |
| 193 | /* Not rewriting whole block? */ |
| 194 | if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) && |
| 195 | !new) { |
| 196 | bh = ocfs2_read_quota_block(gqinode, blk, &err); |
| 197 | if (!bh) { |
| 198 | mlog_errno(err); |
| 199 | return err; |
| 200 | } |
| 201 | err = ocfs2_journal_access(handle, gqinode, bh, |
| 202 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 203 | } else { |
| 204 | bh = ocfs2_get_quota_block(gqinode, blk, &err); |
| 205 | if (!bh) { |
| 206 | mlog_errno(err); |
| 207 | return err; |
| 208 | } |
| 209 | err = ocfs2_journal_access(handle, gqinode, bh, |
| 210 | OCFS2_JOURNAL_ACCESS_CREATE); |
| 211 | } |
| 212 | if (err < 0) { |
| 213 | brelse(bh); |
| 214 | goto out; |
| 215 | } |
| 216 | lock_buffer(bh); |
| 217 | if (new) |
| 218 | memset(bh->b_data, 0, sb->s_blocksize); |
| 219 | memcpy(bh->b_data + offset, data, len); |
| 220 | flush_dcache_page(bh->b_page); |
| 221 | unlock_buffer(bh); |
| 222 | ocfs2_set_buffer_uptodate(gqinode, bh); |
| 223 | err = ocfs2_journal_dirty(handle, bh); |
| 224 | brelse(bh); |
| 225 | if (err < 0) |
| 226 | goto out; |
| 227 | out: |
| 228 | if (err) { |
| 229 | mutex_unlock(&gqinode->i_mutex); |
| 230 | mlog_errno(err); |
| 231 | return err; |
| 232 | } |
| 233 | gqinode->i_version++; |
| 234 | ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh); |
| 235 | mutex_unlock(&gqinode->i_mutex); |
| 236 | return len; |
| 237 | } |
| 238 | |
| 239 | int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) |
| 240 | { |
| 241 | int status; |
| 242 | struct buffer_head *bh = NULL; |
| 243 | |
| 244 | status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex); |
| 245 | if (status < 0) |
| 246 | return status; |
| 247 | spin_lock(&dq_data_lock); |
| 248 | if (!oinfo->dqi_gqi_count++) |
| 249 | oinfo->dqi_gqi_bh = bh; |
| 250 | else |
| 251 | WARN_ON(bh != oinfo->dqi_gqi_bh); |
| 252 | spin_unlock(&dq_data_lock); |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex) |
| 257 | { |
| 258 | ocfs2_inode_unlock(oinfo->dqi_gqinode, ex); |
| 259 | brelse(oinfo->dqi_gqi_bh); |
| 260 | spin_lock(&dq_data_lock); |
| 261 | if (!--oinfo->dqi_gqi_count) |
| 262 | oinfo->dqi_gqi_bh = NULL; |
| 263 | spin_unlock(&dq_data_lock); |
| 264 | } |
| 265 | |
| 266 | /* Read information header from global quota file */ |
| 267 | int ocfs2_global_read_info(struct super_block *sb, int type) |
| 268 | { |
| 269 | struct inode *gqinode = NULL; |
| 270 | unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE, |
| 271 | GROUP_QUOTA_SYSTEM_INODE }; |
| 272 | struct ocfs2_global_disk_dqinfo dinfo; |
| 273 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
| 274 | struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; |
| 275 | int status; |
| 276 | |
| 277 | mlog_entry_void(); |
| 278 | |
| 279 | /* Read global header */ |
| 280 | gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type], |
| 281 | OCFS2_INVALID_SLOT); |
| 282 | if (!gqinode) { |
| 283 | mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n", |
| 284 | type); |
| 285 | status = -EINVAL; |
| 286 | goto out_err; |
| 287 | } |
| 288 | oinfo->dqi_gi.dqi_sb = sb; |
| 289 | oinfo->dqi_gi.dqi_type = type; |
| 290 | ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo); |
| 291 | oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk); |
| 292 | oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops; |
| 293 | oinfo->dqi_gqi_bh = NULL; |
| 294 | oinfo->dqi_gqi_count = 0; |
| 295 | oinfo->dqi_gqinode = gqinode; |
| 296 | status = ocfs2_lock_global_qf(oinfo, 0); |
| 297 | if (status < 0) { |
| 298 | mlog_errno(status); |
| 299 | goto out_err; |
| 300 | } |
| 301 | status = sb->s_op->quota_read(sb, type, (char *)&dinfo, |
| 302 | sizeof(struct ocfs2_global_disk_dqinfo), |
| 303 | OCFS2_GLOBAL_INFO_OFF); |
| 304 | ocfs2_unlock_global_qf(oinfo, 0); |
| 305 | if (status != sizeof(struct ocfs2_global_disk_dqinfo)) { |
| 306 | mlog(ML_ERROR, "Cannot read global quota info (%d).\n", |
| 307 | status); |
| 308 | if (status >= 0) |
| 309 | status = -EIO; |
| 310 | mlog_errno(status); |
| 311 | goto out_err; |
| 312 | } |
| 313 | info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); |
| 314 | info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); |
| 315 | oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms); |
| 316 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); |
| 317 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); |
| 318 | oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); |
| 319 | oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits; |
| 320 | oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize - |
| 321 | OCFS2_QBLK_RESERVED_SPACE; |
| 322 | oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi); |
| 323 | out_err: |
| 324 | mlog_exit(status); |
| 325 | return status; |
| 326 | } |
| 327 | |
| 328 | /* Write information to global quota file. Expects exlusive lock on quota |
| 329 | * file inode and quota info */ |
| 330 | static int __ocfs2_global_write_info(struct super_block *sb, int type) |
| 331 | { |
| 332 | struct mem_dqinfo *info = sb_dqinfo(sb, type); |
| 333 | struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv; |
| 334 | struct ocfs2_global_disk_dqinfo dinfo; |
| 335 | ssize_t size; |
| 336 | |
| 337 | spin_lock(&dq_data_lock); |
| 338 | info->dqi_flags &= ~DQF_INFO_DIRTY; |
| 339 | dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); |
| 340 | dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); |
| 341 | spin_unlock(&dq_data_lock); |
| 342 | dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms); |
| 343 | dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks); |
| 344 | dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk); |
| 345 | dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry); |
| 346 | size = sb->s_op->quota_write(sb, type, (char *)&dinfo, |
| 347 | sizeof(struct ocfs2_global_disk_dqinfo), |
| 348 | OCFS2_GLOBAL_INFO_OFF); |
| 349 | if (size != sizeof(struct ocfs2_global_disk_dqinfo)) { |
| 350 | mlog(ML_ERROR, "Cannot write global quota info structure\n"); |
| 351 | if (size >= 0) |
| 352 | size = -EIO; |
| 353 | return size; |
| 354 | } |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | int ocfs2_global_write_info(struct super_block *sb, int type) |
| 359 | { |
| 360 | int err; |
| 361 | struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; |
| 362 | |
| 363 | err = ocfs2_qinfo_lock(info, 1); |
| 364 | if (err < 0) |
| 365 | return err; |
| 366 | err = __ocfs2_global_write_info(sb, type); |
| 367 | ocfs2_qinfo_unlock(info, 1); |
| 368 | return err; |
| 369 | } |
| 370 | |
| 371 | /* Read in information from global quota file and acquire a reference to it. |
| 372 | * dquot_acquire() has already started the transaction and locked quota file */ |
| 373 | int ocfs2_global_read_dquot(struct dquot *dquot) |
| 374 | { |
| 375 | int err, err2, ex = 0; |
| 376 | struct ocfs2_mem_dqinfo *info = |
| 377 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
| 378 | |
| 379 | err = ocfs2_qinfo_lock(info, 0); |
| 380 | if (err < 0) |
| 381 | goto out; |
| 382 | err = qtree_read_dquot(&info->dqi_gi, dquot); |
| 383 | if (err < 0) |
| 384 | goto out_qlock; |
| 385 | OCFS2_DQUOT(dquot)->dq_use_count++; |
| 386 | OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; |
| 387 | OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; |
| 388 | if (!dquot->dq_off) { /* No real quota entry? */ |
| 389 | /* Upgrade to exclusive lock for allocation */ |
| 390 | err = ocfs2_qinfo_lock(info, 1); |
| 391 | if (err < 0) |
| 392 | goto out_qlock; |
| 393 | ex = 1; |
| 394 | } |
| 395 | err = qtree_write_dquot(&info->dqi_gi, dquot); |
| 396 | if (ex && info_dirty(sb_dqinfo(dquot->dq_sb, dquot->dq_type))) { |
| 397 | err2 = __ocfs2_global_write_info(dquot->dq_sb, dquot->dq_type); |
| 398 | if (!err) |
| 399 | err = err2; |
| 400 | } |
| 401 | out_qlock: |
| 402 | if (ex) |
| 403 | ocfs2_qinfo_unlock(info, 1); |
| 404 | ocfs2_qinfo_unlock(info, 0); |
| 405 | out: |
| 406 | if (err < 0) |
| 407 | mlog_errno(err); |
| 408 | return err; |
| 409 | } |
| 410 | |
| 411 | /* Sync local information about quota modifications with global quota file. |
| 412 | * Caller must have started the transaction and obtained exclusive lock for |
| 413 | * global quota file inode */ |
| 414 | int __ocfs2_sync_dquot(struct dquot *dquot, int freeing) |
| 415 | { |
| 416 | int err, err2; |
| 417 | struct super_block *sb = dquot->dq_sb; |
| 418 | int type = dquot->dq_type; |
| 419 | struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv; |
| 420 | struct ocfs2_global_disk_dqblk dqblk; |
| 421 | s64 spacechange, inodechange; |
| 422 | time_t olditime, oldbtime; |
| 423 | |
| 424 | err = sb->s_op->quota_read(sb, type, (char *)&dqblk, |
| 425 | sizeof(struct ocfs2_global_disk_dqblk), |
| 426 | dquot->dq_off); |
| 427 | if (err != sizeof(struct ocfs2_global_disk_dqblk)) { |
| 428 | if (err >= 0) { |
| 429 | mlog(ML_ERROR, "Short read from global quota file " |
| 430 | "(%u read)\n", err); |
| 431 | err = -EIO; |
| 432 | } |
| 433 | goto out; |
| 434 | } |
| 435 | |
| 436 | /* Update space and inode usage. Get also other information from |
| 437 | * global quota file so that we don't overwrite any changes there. |
| 438 | * We are */ |
| 439 | spin_lock(&dq_data_lock); |
| 440 | spacechange = dquot->dq_dqb.dqb_curspace - |
| 441 | OCFS2_DQUOT(dquot)->dq_origspace; |
| 442 | inodechange = dquot->dq_dqb.dqb_curinodes - |
| 443 | OCFS2_DQUOT(dquot)->dq_originodes; |
| 444 | olditime = dquot->dq_dqb.dqb_itime; |
| 445 | oldbtime = dquot->dq_dqb.dqb_btime; |
| 446 | ocfs2_global_disk2memdqb(dquot, &dqblk); |
| 447 | mlog(0, "Syncing global dquot %d space %lld+%lld, inodes %lld+%lld\n", |
| 448 | dquot->dq_id, dquot->dq_dqb.dqb_curspace, spacechange, |
| 449 | dquot->dq_dqb.dqb_curinodes, inodechange); |
| 450 | if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags)) |
| 451 | dquot->dq_dqb.dqb_curspace += spacechange; |
| 452 | if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags)) |
| 453 | dquot->dq_dqb.dqb_curinodes += inodechange; |
| 454 | /* Set properly space grace time... */ |
| 455 | if (dquot->dq_dqb.dqb_bsoftlimit && |
| 456 | dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) { |
| 457 | if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) && |
| 458 | oldbtime > 0) { |
| 459 | if (dquot->dq_dqb.dqb_btime > 0) |
| 460 | dquot->dq_dqb.dqb_btime = |
| 461 | min(dquot->dq_dqb.dqb_btime, oldbtime); |
| 462 | else |
| 463 | dquot->dq_dqb.dqb_btime = oldbtime; |
| 464 | } |
| 465 | } else { |
| 466 | dquot->dq_dqb.dqb_btime = 0; |
| 467 | clear_bit(DQ_BLKS_B, &dquot->dq_flags); |
| 468 | } |
| 469 | /* Set properly inode grace time... */ |
| 470 | if (dquot->dq_dqb.dqb_isoftlimit && |
| 471 | dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) { |
| 472 | if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) && |
| 473 | olditime > 0) { |
| 474 | if (dquot->dq_dqb.dqb_itime > 0) |
| 475 | dquot->dq_dqb.dqb_itime = |
| 476 | min(dquot->dq_dqb.dqb_itime, olditime); |
| 477 | else |
| 478 | dquot->dq_dqb.dqb_itime = olditime; |
| 479 | } |
| 480 | } else { |
| 481 | dquot->dq_dqb.dqb_itime = 0; |
| 482 | clear_bit(DQ_INODES_B, &dquot->dq_flags); |
| 483 | } |
| 484 | /* All information is properly updated, clear the flags */ |
| 485 | __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags); |
| 486 | __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags); |
| 487 | __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags); |
| 488 | __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags); |
| 489 | __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags); |
| 490 | __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags); |
| 491 | OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace; |
| 492 | OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes; |
| 493 | spin_unlock(&dq_data_lock); |
| 494 | err = ocfs2_qinfo_lock(info, freeing); |
| 495 | if (err < 0) { |
| 496 | mlog(ML_ERROR, "Failed to lock quota info, loosing quota write" |
| 497 | " (type=%d, id=%u)\n", dquot->dq_type, |
| 498 | (unsigned)dquot->dq_id); |
| 499 | goto out; |
| 500 | } |
| 501 | if (freeing) |
| 502 | OCFS2_DQUOT(dquot)->dq_use_count--; |
| 503 | err = qtree_write_dquot(&info->dqi_gi, dquot); |
| 504 | if (err < 0) |
| 505 | goto out_qlock; |
| 506 | if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) { |
| 507 | err = qtree_release_dquot(&info->dqi_gi, dquot); |
| 508 | if (info_dirty(sb_dqinfo(sb, type))) { |
| 509 | err2 = __ocfs2_global_write_info(sb, type); |
| 510 | if (!err) |
| 511 | err = err2; |
| 512 | } |
| 513 | } |
| 514 | out_qlock: |
| 515 | ocfs2_qinfo_unlock(info, freeing); |
| 516 | out: |
| 517 | if (err < 0) |
| 518 | mlog_errno(err); |
| 519 | return err; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Wrappers for generic quota functions |
| 524 | */ |
| 525 | |
| 526 | static int ocfs2_write_dquot(struct dquot *dquot) |
| 527 | { |
| 528 | handle_t *handle; |
| 529 | struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); |
| 530 | int status = 0; |
| 531 | |
| 532 | mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type); |
| 533 | |
| 534 | handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS); |
| 535 | if (IS_ERR(handle)) { |
| 536 | status = PTR_ERR(handle); |
| 537 | mlog_errno(status); |
| 538 | goto out; |
| 539 | } |
| 540 | status = dquot_commit(dquot); |
| 541 | ocfs2_commit_trans(osb, handle); |
| 542 | out: |
| 543 | mlog_exit(status); |
| 544 | return status; |
| 545 | } |
| 546 | |
| 547 | int ocfs2_calc_qdel_credits(struct super_block *sb, int type) |
| 548 | { |
| 549 | struct ocfs2_mem_dqinfo *oinfo; |
| 550 | int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA, |
| 551 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA }; |
| 552 | |
| 553 | if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type])) |
| 554 | return 0; |
| 555 | |
| 556 | oinfo = sb_dqinfo(sb, type)->dqi_priv; |
| 557 | /* We modify tree, leaf block, global info, local chunk header, |
| 558 | * global and local inode */ |
| 559 | return oinfo->dqi_gi.dqi_qtree_depth + 2 + 1 + |
| 560 | 2 * OCFS2_INODE_UPDATE_CREDITS; |
| 561 | } |
| 562 | |
| 563 | static int ocfs2_release_dquot(struct dquot *dquot) |
| 564 | { |
| 565 | handle_t *handle; |
| 566 | struct ocfs2_mem_dqinfo *oinfo = |
| 567 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
| 568 | struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); |
| 569 | int status = 0; |
| 570 | |
| 571 | mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type); |
| 572 | |
| 573 | status = ocfs2_lock_global_qf(oinfo, 1); |
| 574 | if (status < 0) |
| 575 | goto out; |
| 576 | handle = ocfs2_start_trans(osb, |
| 577 | ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_type)); |
| 578 | if (IS_ERR(handle)) { |
| 579 | status = PTR_ERR(handle); |
| 580 | mlog_errno(status); |
| 581 | goto out_ilock; |
| 582 | } |
| 583 | status = dquot_release(dquot); |
| 584 | ocfs2_commit_trans(osb, handle); |
| 585 | out_ilock: |
| 586 | ocfs2_unlock_global_qf(oinfo, 1); |
| 587 | out: |
| 588 | mlog_exit(status); |
| 589 | return status; |
| 590 | } |
| 591 | |
| 592 | int ocfs2_calc_qinit_credits(struct super_block *sb, int type) |
| 593 | { |
| 594 | struct ocfs2_mem_dqinfo *oinfo; |
| 595 | int features[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA, |
| 596 | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA }; |
| 597 | struct ocfs2_dinode *lfe, *gfe; |
| 598 | |
| 599 | if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, features[type])) |
| 600 | return 0; |
| 601 | |
| 602 | oinfo = sb_dqinfo(sb, type)->dqi_priv; |
| 603 | gfe = (struct ocfs2_dinode *)oinfo->dqi_gqi_bh->b_data; |
| 604 | lfe = (struct ocfs2_dinode *)oinfo->dqi_lqi_bh->b_data; |
| 605 | /* We can extend local file + global file. In local file we |
| 606 | * can modify info, chunk header block and dquot block. In |
| 607 | * global file we can modify info, tree and leaf block */ |
| 608 | return ocfs2_calc_extend_credits(sb, &lfe->id2.i_list, 0) + |
| 609 | ocfs2_calc_extend_credits(sb, &gfe->id2.i_list, 0) + |
| 610 | 3 + oinfo->dqi_gi.dqi_qtree_depth + 2; |
| 611 | } |
| 612 | |
| 613 | static int ocfs2_acquire_dquot(struct dquot *dquot) |
| 614 | { |
| 615 | handle_t *handle; |
| 616 | struct ocfs2_mem_dqinfo *oinfo = |
| 617 | sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; |
| 618 | struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb); |
| 619 | int status = 0; |
| 620 | |
| 621 | mlog_entry("id=%u, type=%d", dquot->dq_id, dquot->dq_type); |
| 622 | /* We need an exclusive lock, because we're going to update use count |
| 623 | * and instantiate possibly new dquot structure */ |
| 624 | status = ocfs2_lock_global_qf(oinfo, 1); |
| 625 | if (status < 0) |
| 626 | goto out; |
| 627 | handle = ocfs2_start_trans(osb, |
| 628 | ocfs2_calc_qinit_credits(dquot->dq_sb, dquot->dq_type)); |
| 629 | if (IS_ERR(handle)) { |
| 630 | status = PTR_ERR(handle); |
| 631 | mlog_errno(status); |
| 632 | goto out_ilock; |
| 633 | } |
| 634 | status = dquot_acquire(dquot); |
| 635 | ocfs2_commit_trans(osb, handle); |
| 636 | out_ilock: |
| 637 | ocfs2_unlock_global_qf(oinfo, 1); |
| 638 | out: |
| 639 | mlog_exit(status); |
| 640 | return status; |
| 641 | } |
| 642 | |
| 643 | static int ocfs2_mark_dquot_dirty(struct dquot *dquot) |
| 644 | { |
| 645 | unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) | |
| 646 | (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) | |
| 647 | (1 << (DQ_LASTSET_B + QIF_INODES_B)) | |
| 648 | (1 << (DQ_LASTSET_B + QIF_SPACE_B)) | |
| 649 | (1 << (DQ_LASTSET_B + QIF_BTIME_B)) | |
| 650 | (1 << (DQ_LASTSET_B + QIF_ITIME_B)); |
| 651 | int sync = 0; |
| 652 | int status; |
| 653 | struct super_block *sb = dquot->dq_sb; |
| 654 | int type = dquot->dq_type; |
| 655 | struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; |
| 656 | handle_t *handle; |
| 657 | struct ocfs2_super *osb = OCFS2_SB(sb); |
| 658 | |
| 659 | mlog_entry("id=%u, type=%d", dquot->dq_id, type); |
| 660 | dquot_mark_dquot_dirty(dquot); |
| 661 | |
| 662 | /* In case user set some limits, sync dquot immediately to global |
| 663 | * quota file so that information propagates quicker */ |
| 664 | spin_lock(&dq_data_lock); |
| 665 | if (dquot->dq_flags & mask) |
| 666 | sync = 1; |
| 667 | spin_unlock(&dq_data_lock); |
| 668 | if (!sync) { |
| 669 | status = ocfs2_write_dquot(dquot); |
| 670 | goto out; |
| 671 | } |
| 672 | status = ocfs2_lock_global_qf(oinfo, 1); |
| 673 | if (status < 0) |
| 674 | goto out; |
| 675 | handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS); |
| 676 | if (IS_ERR(handle)) { |
| 677 | status = PTR_ERR(handle); |
| 678 | mlog_errno(status); |
| 679 | goto out_ilock; |
| 680 | } |
| 681 | status = ocfs2_sync_dquot(dquot); |
| 682 | if (status < 0) { |
| 683 | mlog_errno(status); |
| 684 | goto out_trans; |
| 685 | } |
| 686 | /* Now write updated local dquot structure */ |
| 687 | status = dquot_commit(dquot); |
| 688 | out_trans: |
| 689 | ocfs2_commit_trans(osb, handle); |
| 690 | out_ilock: |
| 691 | ocfs2_unlock_global_qf(oinfo, 1); |
| 692 | out: |
| 693 | mlog_exit(status); |
| 694 | return status; |
| 695 | } |
| 696 | |
| 697 | /* This should happen only after set_dqinfo(). */ |
| 698 | static int ocfs2_write_info(struct super_block *sb, int type) |
| 699 | { |
| 700 | handle_t *handle; |
| 701 | int status = 0; |
| 702 | struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv; |
| 703 | |
| 704 | mlog_entry_void(); |
| 705 | |
| 706 | status = ocfs2_lock_global_qf(oinfo, 1); |
| 707 | if (status < 0) |
| 708 | goto out; |
| 709 | handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS); |
| 710 | if (IS_ERR(handle)) { |
| 711 | status = PTR_ERR(handle); |
| 712 | mlog_errno(status); |
| 713 | goto out_ilock; |
| 714 | } |
| 715 | status = dquot_commit_info(sb, type); |
| 716 | ocfs2_commit_trans(OCFS2_SB(sb), handle); |
| 717 | out_ilock: |
| 718 | ocfs2_unlock_global_qf(oinfo, 1); |
| 719 | out: |
| 720 | mlog_exit(status); |
| 721 | return status; |
| 722 | } |
| 723 | |
| 724 | /* This is difficult. We have to lock quota inode and start transaction |
| 725 | * in this function but we don't want to take the penalty of exlusive |
| 726 | * quota file lock when we are just going to use cached structures. So |
| 727 | * we just take read lock check whether we have dquot cached and if so, |
| 728 | * we don't have to take the write lock... */ |
| 729 | static int ocfs2_dquot_initialize(struct inode *inode, int type) |
| 730 | { |
| 731 | handle_t *handle = NULL; |
| 732 | int status = 0; |
| 733 | struct super_block *sb = inode->i_sb; |
| 734 | struct ocfs2_mem_dqinfo *oinfo; |
| 735 | int exclusive = 0; |
| 736 | int cnt; |
| 737 | qid_t id; |
| 738 | |
| 739 | mlog_entry_void(); |
| 740 | |
| 741 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| 742 | if (type != -1 && cnt != type) |
| 743 | continue; |
| 744 | if (!sb_has_quota_active(sb, cnt)) |
| 745 | continue; |
| 746 | oinfo = sb_dqinfo(sb, cnt)->dqi_priv; |
| 747 | status = ocfs2_lock_global_qf(oinfo, 0); |
| 748 | if (status < 0) |
| 749 | goto out; |
| 750 | /* This is just a performance optimization not a reliable test. |
| 751 | * Since we hold an inode lock, noone can actually release |
| 752 | * the structure until we are finished with initialization. */ |
| 753 | if (inode->i_dquot[cnt] != NODQUOT) { |
| 754 | ocfs2_unlock_global_qf(oinfo, 0); |
| 755 | continue; |
| 756 | } |
| 757 | /* When we have inode lock, we know that no dquot_release() can |
| 758 | * run and thus we can safely check whether we need to |
| 759 | * read+modify global file to get quota information or whether |
| 760 | * our node already has it. */ |
| 761 | if (cnt == USRQUOTA) |
| 762 | id = inode->i_uid; |
| 763 | else if (cnt == GRPQUOTA) |
| 764 | id = inode->i_gid; |
| 765 | else |
| 766 | BUG(); |
| 767 | /* Obtain exclusion from quota off... */ |
| 768 | down_write(&sb_dqopt(sb)->dqptr_sem); |
| 769 | exclusive = !dquot_is_cached(sb, id, cnt); |
| 770 | up_write(&sb_dqopt(sb)->dqptr_sem); |
| 771 | if (exclusive) { |
| 772 | status = ocfs2_lock_global_qf(oinfo, 1); |
| 773 | if (status < 0) { |
| 774 | exclusive = 0; |
| 775 | mlog_errno(status); |
| 776 | goto out_ilock; |
| 777 | } |
| 778 | handle = ocfs2_start_trans(OCFS2_SB(sb), |
| 779 | ocfs2_calc_qinit_credits(sb, cnt)); |
| 780 | if (IS_ERR(handle)) { |
| 781 | status = PTR_ERR(handle); |
| 782 | mlog_errno(status); |
| 783 | goto out_ilock; |
| 784 | } |
| 785 | } |
| 786 | dquot_initialize(inode, cnt); |
| 787 | if (exclusive) { |
| 788 | ocfs2_commit_trans(OCFS2_SB(sb), handle); |
| 789 | ocfs2_unlock_global_qf(oinfo, 1); |
| 790 | } |
| 791 | ocfs2_unlock_global_qf(oinfo, 0); |
| 792 | } |
| 793 | mlog_exit(0); |
| 794 | return 0; |
| 795 | out_ilock: |
| 796 | if (exclusive) |
| 797 | ocfs2_unlock_global_qf(oinfo, 1); |
| 798 | ocfs2_unlock_global_qf(oinfo, 0); |
| 799 | out: |
| 800 | mlog_exit(status); |
| 801 | return status; |
| 802 | } |
| 803 | |
| 804 | static int ocfs2_dquot_drop_slow(struct inode *inode) |
| 805 | { |
| 806 | int status; |
| 807 | int cnt; |
| 808 | int got_lock[MAXQUOTAS] = {0, 0}; |
| 809 | handle_t *handle; |
| 810 | struct super_block *sb = inode->i_sb; |
| 811 | struct ocfs2_mem_dqinfo *oinfo; |
| 812 | |
| 813 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| 814 | if (!sb_has_quota_active(sb, cnt)) |
| 815 | continue; |
| 816 | oinfo = sb_dqinfo(sb, cnt)->dqi_priv; |
| 817 | status = ocfs2_lock_global_qf(oinfo, 1); |
| 818 | if (status < 0) |
| 819 | goto out; |
| 820 | got_lock[cnt] = 1; |
| 821 | } |
| 822 | handle = ocfs2_start_trans(OCFS2_SB(sb), |
| 823 | ocfs2_calc_qinit_credits(sb, USRQUOTA) + |
| 824 | ocfs2_calc_qinit_credits(sb, GRPQUOTA)); |
| 825 | if (IS_ERR(handle)) { |
| 826 | status = PTR_ERR(handle); |
| 827 | mlog_errno(status); |
| 828 | goto out; |
| 829 | } |
| 830 | dquot_drop(inode); |
| 831 | ocfs2_commit_trans(OCFS2_SB(sb), handle); |
| 832 | out: |
| 833 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
| 834 | if (got_lock[cnt]) { |
| 835 | oinfo = sb_dqinfo(sb, cnt)->dqi_priv; |
| 836 | ocfs2_unlock_global_qf(oinfo, 1); |
| 837 | } |
| 838 | return status; |
| 839 | } |
| 840 | |
| 841 | /* See the comment before ocfs2_dquot_initialize. */ |
| 842 | static int ocfs2_dquot_drop(struct inode *inode) |
| 843 | { |
| 844 | int status = 0; |
| 845 | struct super_block *sb = inode->i_sb; |
| 846 | struct ocfs2_mem_dqinfo *oinfo; |
| 847 | int exclusive = 0; |
| 848 | int cnt; |
| 849 | int got_lock[MAXQUOTAS] = {0, 0}; |
| 850 | |
| 851 | mlog_entry_void(); |
| 852 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| 853 | if (!sb_has_quota_active(sb, cnt)) |
| 854 | continue; |
| 855 | oinfo = sb_dqinfo(sb, cnt)->dqi_priv; |
| 856 | status = ocfs2_lock_global_qf(oinfo, 0); |
| 857 | if (status < 0) |
| 858 | goto out; |
| 859 | got_lock[cnt] = 1; |
| 860 | } |
| 861 | /* Lock against anyone releasing references so that when when we check |
| 862 | * we know we are not going to be last ones to release dquot */ |
| 863 | down_write(&sb_dqopt(sb)->dqptr_sem); |
| 864 | /* Urgh, this is a terrible hack :( */ |
| 865 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) { |
| 866 | if (inode->i_dquot[cnt] != NODQUOT && |
| 867 | atomic_read(&inode->i_dquot[cnt]->dq_count) > 1) { |
| 868 | exclusive = 1; |
| 869 | break; |
| 870 | } |
| 871 | } |
| 872 | if (!exclusive) |
| 873 | dquot_drop_locked(inode); |
| 874 | up_write(&sb_dqopt(sb)->dqptr_sem); |
| 875 | out: |
| 876 | for (cnt = 0; cnt < MAXQUOTAS; cnt++) |
| 877 | if (got_lock[cnt]) { |
| 878 | oinfo = sb_dqinfo(sb, cnt)->dqi_priv; |
| 879 | ocfs2_unlock_global_qf(oinfo, 0); |
| 880 | } |
| 881 | /* In case we bailed out because we had to do expensive locking |
| 882 | * do it now... */ |
| 883 | if (exclusive) |
| 884 | status = ocfs2_dquot_drop_slow(inode); |
| 885 | mlog_exit(status); |
| 886 | return status; |
| 887 | } |
| 888 | |
| 889 | static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type) |
| 890 | { |
| 891 | struct ocfs2_dquot *dquot = |
| 892 | kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS); |
| 893 | |
| 894 | if (!dquot) |
| 895 | return NULL; |
| 896 | return &dquot->dq_dquot; |
| 897 | } |
| 898 | |
| 899 | static void ocfs2_destroy_dquot(struct dquot *dquot) |
| 900 | { |
| 901 | kmem_cache_free(ocfs2_dquot_cachep, dquot); |
| 902 | } |
| 903 | |
| 904 | struct dquot_operations ocfs2_quota_operations = { |
| 905 | .initialize = ocfs2_dquot_initialize, |
| 906 | .drop = ocfs2_dquot_drop, |
| 907 | .alloc_space = dquot_alloc_space, |
| 908 | .alloc_inode = dquot_alloc_inode, |
| 909 | .free_space = dquot_free_space, |
| 910 | .free_inode = dquot_free_inode, |
| 911 | .transfer = dquot_transfer, |
| 912 | .write_dquot = ocfs2_write_dquot, |
| 913 | .acquire_dquot = ocfs2_acquire_dquot, |
| 914 | .release_dquot = ocfs2_release_dquot, |
| 915 | .mark_dirty = ocfs2_mark_dquot_dirty, |
| 916 | .write_info = ocfs2_write_info, |
| 917 | .alloc_dquot = ocfs2_alloc_dquot, |
| 918 | .destroy_dquot = ocfs2_destroy_dquot, |
| 919 | }; |