4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
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.
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)
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)
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)
21 #define DEF_RA_NID_PAGES 0 /* # of nid pages to be readaheaded */
23 /* maximum readahead size for node during getting data blocks */
24 #define MAX_RA_NODE 128
26 /* control the memory footprint threshold (10MB per 1GB ram) */
27 #define DEF_RAM_THRESHOLD 1
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
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
38 /* return value for read_node_page */
41 /* For flag in struct node_info */
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? */
50 * For node information
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 */
61 struct list_head list; /* for clean or dirty nat list */
62 struct node_info ni; /* in-memory node information */
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)
74 #define inc_node_version(version) (++version)
76 static inline void copy_node_info(struct node_info *dst,
77 struct node_info *src)
81 dst->blk_addr = src->blk_addr;
82 dst->version = src->version;
83 /* should not copy flag here */
86 static inline void set_nat_flag(struct nat_entry *ne,
87 unsigned int type, bool set)
89 unsigned char mask = 0x01 << type;
96 static inline bool get_nat_flag(struct nat_entry *ne, unsigned int type)
98 unsigned char mask = 0x01 << type;
99 return ne->ni.flag & mask;
102 static inline void nat_reset_flag(struct nat_entry *ne)
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);
110 static inline void node_info_from_raw_nat(struct node_info *ni,
111 struct f2fs_nat_entry *raw_ne)
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;
118 static inline void raw_nat_from_node_info(struct f2fs_nat_entry *raw_ne,
119 struct node_info *ni)
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;
126 static inline bool excess_dirty_nats(struct f2fs_sb_info *sbi)
128 return NM_I(sbi)->dirty_nat_cnt >= NM_I(sbi)->max_nid *
129 NM_I(sbi)->dirty_nats_ratio / 100;
132 static inline bool excess_cached_nats(struct f2fs_sb_info *sbi)
134 return NM_I(sbi)->nat_cnt >= DEF_NAT_CACHE_THRESHOLD;
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 */
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 */
154 * For free nid mangement
157 NID_NEW, /* newly added to free nid list */
158 NID_ALLOC /* it is allocated */
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 */
167 static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
169 struct f2fs_nm_info *nm_i = NM_I(sbi);
170 struct free_nid *fnid;
172 spin_lock(&nm_i->free_nid_list_lock);
173 if (nm_i->fcnt <= 0) {
174 spin_unlock(&nm_i->free_nid_list_lock);
177 fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list);
179 spin_unlock(&nm_i->free_nid_list_lock);
185 static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr)
187 struct f2fs_nm_info *nm_i = NM_I(sbi);
188 memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size);
191 static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start)
193 struct f2fs_nm_info *nm_i = NM_I(sbi);
198 block_off = NAT_BLOCK_OFFSET(start);
199 seg_off = block_off >> sbi->log_blocks_per_seg;
201 block_addr = (pgoff_t)(nm_i->nat_blkaddr +
202 (seg_off << sbi->log_blocks_per_seg << 1) +
203 (block_off & (sbi->blocks_per_seg - 1)));
205 if (f2fs_test_bit(block_off, nm_i->nat_bitmap))
206 block_addr += sbi->blocks_per_seg;
211 static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi,
214 struct f2fs_nm_info *nm_i = NM_I(sbi);
216 block_addr -= nm_i->nat_blkaddr;
217 if ((block_addr >> sbi->log_blocks_per_seg) % 2)
218 block_addr -= sbi->blocks_per_seg;
220 block_addr += sbi->blocks_per_seg;
222 return block_addr + nm_i->nat_blkaddr;
225 static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid)
227 unsigned int block_off = NAT_BLOCK_OFFSET(start_nid);
229 f2fs_change_bit(block_off, nm_i->nat_bitmap);
232 static inline nid_t ino_of_node(struct page *node_page)
234 struct f2fs_node *rn = F2FS_NODE(node_page);
235 return le32_to_cpu(rn->footer.ino);
238 static inline nid_t nid_of_node(struct page *node_page)
240 struct f2fs_node *rn = F2FS_NODE(node_page);
241 return le32_to_cpu(rn->footer.nid);
244 static inline unsigned int ofs_of_node(struct page *node_page)
246 struct f2fs_node *rn = F2FS_NODE(node_page);
247 unsigned flag = le32_to_cpu(rn->footer.flag);
248 return flag >> OFFSET_BIT_SHIFT;
251 static inline __u64 cpver_of_node(struct page *node_page)
253 struct f2fs_node *rn = F2FS_NODE(node_page);
254 return le64_to_cpu(rn->footer.cp_ver);
257 static inline block_t next_blkaddr_of_node(struct page *node_page)
259 struct f2fs_node *rn = F2FS_NODE(node_page);
260 return le32_to_cpu(rn->footer.next_blkaddr);
263 static inline void fill_node_footer(struct page *page, nid_t nid,
264 nid_t ino, unsigned int ofs, bool reset)
266 struct f2fs_node *rn = F2FS_NODE(page);
267 unsigned int old_flag = 0;
270 memset(rn, 0, sizeof(*rn));
272 old_flag = le32_to_cpu(rn->footer.flag);
274 rn->footer.nid = cpu_to_le32(nid);
275 rn->footer.ino = cpu_to_le32(ino);
277 /* should remain old flag bits such as COLD_BIT_SHIFT */
278 rn->footer.flag = cpu_to_le32((ofs << OFFSET_BIT_SHIFT) |
279 (old_flag & OFFSET_BIT_MASK));
282 static inline void copy_node_footer(struct page *dst, struct page *src)
284 struct f2fs_node *src_rn = F2FS_NODE(src);
285 struct f2fs_node *dst_rn = F2FS_NODE(dst);
286 memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer));
289 static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr)
291 struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page));
292 struct f2fs_node *rn = F2FS_NODE(page);
293 size_t crc_offset = le32_to_cpu(ckpt->checksum_offset);
294 __u64 cp_ver = le64_to_cpu(ckpt->checkpoint_ver);
296 if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) {
297 __u64 crc = le32_to_cpu(*((__le32 *)
298 ((unsigned char *)ckpt + crc_offset)));
299 cp_ver |= (crc << 32);
301 rn->footer.cp_ver = cpu_to_le64(cp_ver);
302 rn->footer.next_blkaddr = cpu_to_le32(blkaddr);
305 static inline bool is_recoverable_dnode(struct page *page)
307 struct f2fs_checkpoint *ckpt = F2FS_CKPT(F2FS_P_SB(page));
308 size_t crc_offset = le32_to_cpu(ckpt->checksum_offset);
309 __u64 cp_ver = cur_cp_version(ckpt);
311 if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG)) {
312 __u64 crc = le32_to_cpu(*((__le32 *)
313 ((unsigned char *)ckpt + crc_offset)));
314 cp_ver |= (crc << 32);
316 return cpu_to_le64(cp_ver) == cpver_of_node(page);
320 * f2fs assigns the following node offsets described as (num).
326 * |- indirect node (3)
327 * | `- direct node (4 => 4 + N - 1)
328 * |- indirect node (4 + N)
329 * | `- direct node (5 + N => 5 + 2N - 1)
330 * `- double indirect node (5 + 2N)
331 * `- indirect node (6 + 2N)
334 * `- indirect node ((6 + 2N) + x(N + 1))
337 * `- indirect node ((6 + 2N) + (N - 1)(N + 1))
340 static inline bool IS_DNODE(struct page *node_page)
342 unsigned int ofs = ofs_of_node(node_page);
344 if (f2fs_has_xattr_block(ofs))
347 if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK ||
348 ofs == 5 + 2 * NIDS_PER_BLOCK)
350 if (ofs >= 6 + 2 * NIDS_PER_BLOCK) {
351 ofs -= 6 + 2 * NIDS_PER_BLOCK;
352 if (!((long int)ofs % (NIDS_PER_BLOCK + 1)))
358 static inline int set_nid(struct page *p, int off, nid_t nid, bool i)
360 struct f2fs_node *rn = F2FS_NODE(p);
362 f2fs_wait_on_page_writeback(p, NODE, true);
365 rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid);
367 rn->in.nid[off] = cpu_to_le32(nid);
368 return set_page_dirty(p);
371 static inline nid_t get_nid(struct page *p, int off, bool i)
373 struct f2fs_node *rn = F2FS_NODE(p);
376 return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]);
377 return le32_to_cpu(rn->in.nid[off]);
381 * Coldness identification:
382 * - Mark cold files in f2fs_inode_info
383 * - Mark cold node blocks in their node footer
384 * - Mark cold data pages in page cache
386 static inline int is_cold_data(struct page *page)
388 return PageChecked(page);
391 static inline void set_cold_data(struct page *page)
393 SetPageChecked(page);
396 static inline void clear_cold_data(struct page *page)
398 ClearPageChecked(page);
401 static inline int is_node(struct page *page, int type)
403 struct f2fs_node *rn = F2FS_NODE(page);
404 return le32_to_cpu(rn->footer.flag) & (1 << type);
407 #define is_cold_node(page) is_node(page, COLD_BIT_SHIFT)
408 #define is_fsync_dnode(page) is_node(page, FSYNC_BIT_SHIFT)
409 #define is_dent_dnode(page) is_node(page, DENT_BIT_SHIFT)
411 static inline int is_inline_node(struct page *page)
413 return PageChecked(page);
416 static inline void set_inline_node(struct page *page)
418 SetPageChecked(page);
421 static inline void clear_inline_node(struct page *page)
423 ClearPageChecked(page);
426 static inline void set_cold_node(struct inode *inode, struct page *page)
428 struct f2fs_node *rn = F2FS_NODE(page);
429 unsigned int flag = le32_to_cpu(rn->footer.flag);
431 if (S_ISDIR(inode->i_mode))
432 flag &= ~(0x1 << COLD_BIT_SHIFT);
434 flag |= (0x1 << COLD_BIT_SHIFT);
435 rn->footer.flag = cpu_to_le32(flag);
438 static inline void set_mark(struct page *page, int mark, int type)
440 struct f2fs_node *rn = F2FS_NODE(page);
441 unsigned int flag = le32_to_cpu(rn->footer.flag);
443 flag |= (0x1 << type);
445 flag &= ~(0x1 << type);
446 rn->footer.flag = cpu_to_le32(flag);
448 #define set_dentry_mark(page, mark) set_mark(page, mark, DENT_BIT_SHIFT)
449 #define set_fsync_mark(page, mark) set_mark(page, mark, FSYNC_BIT_SHIFT)