fs/f2fs/node.h

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