1 /* 2 * fs/f2fs/node.h 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 /* start node id of a node block dedicated to the given node id */ 12 #define START_NID(nid) ((nid / NAT_ENTRY_PER_BLOCK) * NAT_ENTRY_PER_BLOCK) 13 14 /* node block offset on the NAT area dedicated to the given start node id */ 15 #define NAT_BLOCK_OFFSET(start_nid) (start_nid / NAT_ENTRY_PER_BLOCK) 16 17 /* # of pages to perform synchronous readahead before building free nids */ 18 #define FREE_NID_PAGES 8 19 #define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES) 20 21 #define DEF_RA_NID_PAGES 0 /* # of nid pages to be readaheaded */ 22 23 /* maximum readahead size for node during getting data blocks */ 24 #define MAX_RA_NODE 128 25 26 /* control the memory footprint threshold (10MB per 1GB ram) */ 27 #define DEF_RAM_THRESHOLD 1 28 29 /* control dirty nats ratio threshold (default: 10% over max nid count) */ 30 #define DEF_DIRTY_NAT_RATIO_THRESHOLD 10 31 /* control total # of nats */ 32 #define DEF_NAT_CACHE_THRESHOLD 100000 33 34 /* vector size for gang look-up from nat cache that consists of radix tree */ 35 #define NATVEC_SIZE 64 36 #define SETVEC_SIZE 32 37 38 /* return value for read_node_page */ 39 #define LOCKED_PAGE 1 40 41 /* For flag in struct node_info */ 42 enum { 43 IS_CHECKPOINTED, /* is it checkpointed before? */ 44 HAS_FSYNCED_INODE, /* is the inode fsynced before? */ 45 HAS_LAST_FSYNC, /* has the latest node fsync mark? */ 46 IS_DIRTY, /* this nat entry is dirty? */ 47 }; 48 49 /* 50 * For node information 51 */ 52 struct node_info { 53 nid_t nid; /* node id */ 54 nid_t ino; /* inode number of the node's owner */ 55 block_t blk_addr; /* block address of the node */ 56 unsigned char version; /* version of the node */ 57 unsigned char flag; /* for node information bits */ 58 }; 59 60 struct nat_entry { 61 struct list_head list; /* for clean or dirty nat list */ 62 struct node_info ni; /* in-memory node information */ 63 }; 64 65 #define nat_get_nid(nat) (nat->ni.nid) 66 #define nat_set_nid(nat, n) (nat->ni.nid = n) 67 #define nat_get_blkaddr(nat) (nat->ni.blk_addr) 68 #define nat_set_blkaddr(nat, b) (nat->ni.blk_addr = b) 69 #define nat_get_ino(nat) (nat->ni.ino) 70 #define nat_set_ino(nat, i) (nat->ni.ino = i) 71 #define nat_get_version(nat) (nat->ni.version) 72 #define nat_set_version(nat, v) (nat->ni.version = v) 73 74 #define inc_node_version(version) (++version) 75 76 static inline void copy_node_info(struct node_info *dst, 77 struct node_info *src) 78 { 79 dst->nid = src->nid; 80 dst->ino = src->ino; 81 dst->blk_addr = src->blk_addr; 82 dst->version = src->version; 83 /* should not copy flag here */ 84 } 85 86 static inline void set_nat_flag(struct nat_entry *ne, 87 unsigned int type, bool set) 88 { 89 unsigned char mask = 0x01 << type; 90 if (set) 91 ne->ni.flag |= mask; 92 else 93 ne->ni.flag &= ~mask; 94 } 95 96 static inline bool get_nat_flag(struct nat_entry *ne, unsigned int type) 97 { 98 unsigned char mask = 0x01 << type; 99 return ne->ni.flag & mask; 100 } 101 102 static inline void nat_reset_flag(struct nat_entry *ne) 103 { 104 /* these states can be set only after checkpoint was done */ 105 set_nat_flag(ne, IS_CHECKPOINTED, true); 106 set_nat_flag(ne, HAS_FSYNCED_INODE, false); 107 set_nat_flag(ne, HAS_LAST_FSYNC, true); 108 } 109 110 static inline void node_info_from_raw_nat(struct node_info *ni, 111 struct f2fs_nat_entry *raw_ne) 112 { 113 ni->ino = le32_to_cpu(raw_ne->ino); 114 ni->blk_addr = le32_to_cpu(raw_ne->block_addr); 115 ni->version = raw_ne->version; 116 } 117 118 static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne, 119 struct node_info *ni) 120 { 121 raw_ne->ino = cpu_to_le32(ni->ino); 122 raw_ne->block_addr = cpu_to_le32(ni->blk_addr); 123 raw_ne->version = ni->version; 124 } 125 126 static inline bool excess_dirty_nats(struct f2fs_sb_info *sbi) 127 { 128 return NM_I(sbi)->dirty_nat_cnt >= NM_I(sbi)->max_nid * 129 NM_I(sbi)->dirty_nats_ratio / 100; 130 } 131 132 static inline bool excess_cached_nats(struct f2fs_sb_info *sbi) 133 { 134 return NM_I(sbi)->nat_cnt >= DEF_NAT_CACHE_THRESHOLD; 135 } 136 137 enum mem_type { 138 FREE_NIDS, /* indicates the free nid list */ 139 NAT_ENTRIES, /* indicates the cached nat entry */ 140 DIRTY_DENTS, /* indicates dirty dentry pages */ 141 INO_ENTRIES, /* indicates inode entries */ 142 EXTENT_CACHE, /* indicates extent cache */ 143 BASE_CHECK, /* check kernel status */ 144 }; 145 146 struct nat_entry_set { 147 struct list_head set_list; /* link with other nat sets */ 148 struct list_head entry_list; /* link with dirty nat entries */ 149 nid_t set; /* set number*/ 150 unsigned int entry_cnt; /* the # of nat entries in set */ 151 }; 152 153 /* 154 * For free nid mangement 155 */ 156 enum nid_state { 157 NID_NEW, /* newly added to free nid list */ 158 NID_ALLOC /* it is allocated */ 159 }; 160 161 struct free_nid { 162 struct list_head list; /* for free node id list */ 163 nid_t nid; /* node id */ 164 int state; /* in use or not: NID_NEW or NID_ALLOC */ 165 }; 166 167 static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid) 168 { 169 struct f2fs_nm_info *nm_i = NM_I(sbi); 170 struct free_nid *fnid; 171 172 spin_lock(&nm_i->nid_list_lock); 173 if (nm_i->nid_cnt[FREE_NID_LIST] <= 0) { 174 spin_unlock(&nm_i->nid_list_lock); 175 return; 176 } 177 fnid = list_first_entry(&nm_i->nid_list[FREE_NID_LIST], 178 struct free_nid, list); 179 *nid = fnid->nid; 180 spin_unlock(&nm_i->nid_list_lock); 181 } 182 183 /* 184 * inline functions 185 */ 186 static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr) 187 { 188 struct f2fs_nm_info *nm_i = NM_I(sbi); 189 190 #ifdef CONFIG_F2FS_CHECK_FS 191 if (memcmp(nm_i->nat_bitmap, nm_i->nat_bitmap_mir, 192 nm_i->bitmap_size)) 193 f2fs_bug_on(sbi, 1); 194 #endif 195 memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size); 196 } 197 198 static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start) 199 { 200 struct f2fs_nm_info *nm_i = NM_I(sbi); 201 pgoff_t block_off; 202 pgoff_t block_addr; 203 int seg_off; 204 205 block_off = NAT_BLOCK_OFFSET(start); 206 seg_off = block_off >> sbi->log_blocks_per_seg; 207 208 block_addr = (pgoff_t)(nm_i->nat_blkaddr + 209 (seg_off << sbi->log_blocks_per_seg << 1) + 210 (block_off & (sbi->blocks_per_seg - 1))); 211 212 if (f2fs_test_bit(block_off, nm_i->nat_bitmap)) 213 block_addr += sbi->blocks_per_seg; 214 215 return block_addr; 216 } 217 218 static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi, 219 pgoff_t block_addr) 220 { 221 struct f2fs_nm_info *nm_i = NM_I(sbi); 222 223 block_addr -= nm_i->nat_blkaddr; 224 if ((block_addr >> sbi->log_blocks_per_seg) % 2) 225 block_addr -= sbi->blocks_per_seg; 226 else 227 block_addr += sbi->blocks_per_seg; 228 229 return block_addr + nm_i->nat_blkaddr; 230 } 231 232 static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid) 233 { 234 unsigned int block_off = NAT_BLOCK_OFFSET(start_nid); 235 236 f2fs_change_bit(block_off, nm_i->nat_bitmap); 237 #ifdef CONFIG_F2FS_CHECK_FS 238 f2fs_change_bit(block_off, nm_i->nat_bitmap_mir); 239 #endif 240 } 241 242 static inline nid_t ino_of_node(struct page *node_page) 243 { 244 struct f2fs_node *rn = F2FS_NODE(node_page); 245 return le32_to_cpu(rn->footer.ino); 246 } 247 248 static inline nid_t nid_of_node(struct page *node_page) 249 { 250 struct f2fs_node *rn = F2FS_NODE(node_page); 251 return le32_to_cpu(rn->footer.nid); 252 } 253 254 static inline unsigned int ofs_of_node(struct page *node_page) 255 { 256 struct f2fs_node *rn = F2FS_NODE(node_page); 257 unsigned flag = le32_to_cpu(rn->footer.flag); 258 return flag >> OFFSET_BIT_SHIFT; 259 } 260 261 static inline __u64 cpver_of_node(struct page *node_page) 262 { 263 struct f2fs_node *rn = F2FS_NODE(node_page); 264 return le64_to_cpu(rn->footer.cp_ver); 265 } 266 267 static inline block_t next_blkaddr_of_node(struct page *node_page) 268 { 269 struct f2fs_node *rn = F2FS_NODE(node_page); 270 return le32_to_cpu(rn->footer.next_blkaddr); 271 } 272 273 static inline void fill_node_footer(struct page *page, nid_t nid, 274 nid_t ino, unsigned int ofs, bool reset) 275 { 276 struct f2fs_node *rn = F2FS_NODE(page); 277 unsigned int old_flag = 0; 278 279 if (reset) 280 memset(rn, 0, sizeof(*rn)); 281 else 282 old_flag = le32_to_cpu(rn->footer.flag); 283 284 rn->footer.nid = cpu_to_le32(nid); 285 rn->footer.ino = cpu_to_le32(ino); 286 287 /* should remain old flag bits such as COLD_BIT_SHIFT */ 288 rn->footer.flag = cpu_to_le32((ofs << OFFSET_BIT_SHIFT) | 289 (old_flag & OFFSET_BIT_MASK)); 290 } 291 292 static inline void copy_node_footer(struct page *dst, struct page *src) 293 { 294 struct f2fs_node *src_rn = F2FS_NODE(src); 295 struct f2fs_node *dst_rn = F2FS_NODE(dst); 296 memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer)); 297 } 298 299 static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr) 300 { 301 struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page)); 302 struct f2fs_node *rn = F2FS_NODE(page); 303 __u64 cp_ver = cur_cp_version(ckpt); 304 305 if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) 306 cp_ver |= (cur_cp_crc(ckpt) << 32); 307 308 rn->footer.cp_ver = cpu_to_le64(cp_ver); 309 rn->footer.next_blkaddr = cpu_to_le32(blkaddr); 310 } 311 312 static inline bool is_recoverable_dnode(struct page *page) 313 { 314 struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page)); 315 __u64 cp_ver = cur_cp_version(ckpt); 316 317 if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) 318 cp_ver |= (cur_cp_crc(ckpt) << 32); 319 320 return cp_ver == cpver_of_node(page); 321 } 322 323 /* 324 * f2fs assigns the following node offsets described as (num). 325 * N = NIDS_PER_BLOCK 326 * 327 * Inode block (0) 328 * |- direct node (1) 329 * |- direct node (2) 330 * |- indirect node (3) 331 * | `- direct node (4 => 4 + N - 1) 332 * |- indirect node (4 + N) 333 * | `- direct node (5 + N => 5 + 2N - 1) 334 * `- double indirect node (5 + 2N) 335 * `- indirect node (6 + 2N) 336 * `- direct node 337 * ...... 338 * `- indirect node ((6 + 2N) + x(N + 1)) 339 * `- direct node 340 * ...... 341 * `- indirect node ((6 + 2N) + (N - 1)(N + 1)) 342 * `- direct node 343 */ 344 static inline bool IS_DNODE(struct page *node_page) 345 { 346 unsigned int ofs = ofs_of_node(node_page); 347 348 if (f2fs_has_xattr_block(ofs)) 349 return true; 350 351 if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK || 352 ofs == 5 + 2 * NIDS_PER_BLOCK) 353 return false; 354 if (ofs >= 6 + 2 * NIDS_PER_BLOCK) { 355 ofs -= 6 + 2 * NIDS_PER_BLOCK; 356 if (!((long int)ofs % (NIDS_PER_BLOCK + 1))) 357 return false; 358 } 359 return true; 360 } 361 362 static inline int set_nid(struct page *p, int off, nid_t nid, bool i) 363 { 364 struct f2fs_node *rn = F2FS_NODE(p); 365 366 f2fs_wait_on_page_writeback(p, NODE, true); 367 368 if (i) 369 rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid); 370 else 371 rn->in.nid[off] = cpu_to_le32(nid); 372 return set_page_dirty(p); 373 } 374 375 static inline nid_t get_nid(struct page *p, int off, bool i) 376 { 377 struct f2fs_node *rn = F2FS_NODE(p); 378 379 if (i) 380 return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]); 381 return le32_to_cpu(rn->in.nid[off]); 382 } 383 384 /* 385 * Coldness identification: 386 * - Mark cold files in f2fs_inode_info 387 * - Mark cold node blocks in their node footer 388 * - Mark cold data pages in page cache 389 */ 390 static inline int is_cold_data(struct page *page) 391 { 392 return PageChecked(page); 393 } 394 395 static inline void set_cold_data(struct page *page) 396 { 397 SetPageChecked(page); 398 } 399 400 static inline void clear_cold_data(struct page *page) 401 { 402 ClearPageChecked(page); 403 } 404 405 static inline int is_node(struct page *page, int type) 406 { 407 struct f2fs_node *rn = F2FS_NODE(page); 408 return le32_to_cpu(rn->footer.flag) & (1 << type); 409 } 410 411 #define is_cold_node(page) is_node(page, COLD_BIT_SHIFT) 412 #define is_fsync_dnode(page) is_node(page, FSYNC_BIT_SHIFT) 413 #define is_dent_dnode(page) is_node(page, DENT_BIT_SHIFT) 414 415 static inline int is_inline_node(struct page *page) 416 { 417 return PageChecked(page); 418 } 419 420 static inline void set_inline_node(struct page *page) 421 { 422 SetPageChecked(page); 423 } 424 425 static inline void clear_inline_node(struct page *page) 426 { 427 ClearPageChecked(page); 428 } 429 430 static inline void set_cold_node(struct inode *inode, struct page *page) 431 { 432 struct f2fs_node *rn = F2FS_NODE(page); 433 unsigned int flag = le32_to_cpu(rn->footer.flag); 434 435 if (S_ISDIR(inode->i_mode)) 436 flag &= ~(0x1 << COLD_BIT_SHIFT); 437 else 438 flag |= (0x1 << COLD_BIT_SHIFT); 439 rn->footer.flag = cpu_to_le32(flag); 440 } 441 442 static inline void set_mark(struct page *page, int mark, int type) 443 { 444 struct f2fs_node *rn = F2FS_NODE(page); 445 unsigned int flag = le32_to_cpu(rn->footer.flag); 446 if (mark) 447 flag |= (0x1 << type); 448 else 449 flag &= ~(0x1 << type); 450 rn->footer.flag = cpu_to_le32(flag); 451 } 452 #define set_dentry_mark(page, mark) set_mark(page, mark, DENT_BIT_SHIFT) 453 #define set_fsync_mark(page, mark) set_mark(page, mark, FSYNC_BIT_SHIFT) 454