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0a8165d7 | 1 | /* |
39a53e0c JK |
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 # of free node ids to produce during build_free_nids */ | |
21 | #define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES) | |
22 | ||
23 | /* maximum readahead size for node during getting data blocks */ | |
24 | #define MAX_RA_NODE 128 | |
25 | ||
26 | /* maximum cached nat entries to manage memory footprint */ | |
27 | #define NM_WOUT_THRESHOLD (64 * NAT_ENTRY_PER_BLOCK) | |
28 | ||
29 | /* vector size for gang look-up from nat cache that consists of radix tree */ | |
30 | #define NATVEC_SIZE 64 | |
31 | ||
32 | /* | |
33 | * For node information | |
34 | */ | |
35 | struct node_info { | |
36 | nid_t nid; /* node id */ | |
37 | nid_t ino; /* inode number of the node's owner */ | |
38 | block_t blk_addr; /* block address of the node */ | |
39 | unsigned char version; /* version of the node */ | |
40 | }; | |
41 | ||
42 | struct nat_entry { | |
43 | struct list_head list; /* for clean or dirty nat list */ | |
44 | bool checkpointed; /* whether it is checkpointed or not */ | |
45 | struct node_info ni; /* in-memory node information */ | |
46 | }; | |
47 | ||
48 | #define nat_get_nid(nat) (nat->ni.nid) | |
49 | #define nat_set_nid(nat, n) (nat->ni.nid = n) | |
50 | #define nat_get_blkaddr(nat) (nat->ni.blk_addr) | |
51 | #define nat_set_blkaddr(nat, b) (nat->ni.blk_addr = b) | |
52 | #define nat_get_ino(nat) (nat->ni.ino) | |
53 | #define nat_set_ino(nat, i) (nat->ni.ino = i) | |
54 | #define nat_get_version(nat) (nat->ni.version) | |
55 | #define nat_set_version(nat, v) (nat->ni.version = v) | |
56 | ||
57 | #define __set_nat_cache_dirty(nm_i, ne) \ | |
58 | list_move_tail(&ne->list, &nm_i->dirty_nat_entries); | |
59 | #define __clear_nat_cache_dirty(nm_i, ne) \ | |
60 | list_move_tail(&ne->list, &nm_i->nat_entries); | |
61 | #define inc_node_version(version) (++version) | |
62 | ||
63 | static inline void node_info_from_raw_nat(struct node_info *ni, | |
64 | struct f2fs_nat_entry *raw_ne) | |
65 | { | |
66 | ni->ino = le32_to_cpu(raw_ne->ino); | |
67 | ni->blk_addr = le32_to_cpu(raw_ne->block_addr); | |
68 | ni->version = raw_ne->version; | |
69 | } | |
70 | ||
71 | /* | |
72 | * For free nid mangement | |
73 | */ | |
74 | enum nid_state { | |
75 | NID_NEW, /* newly added to free nid list */ | |
76 | NID_ALLOC /* it is allocated */ | |
77 | }; | |
78 | ||
79 | struct free_nid { | |
80 | struct list_head list; /* for free node id list */ | |
81 | nid_t nid; /* node id */ | |
82 | int state; /* in use or not: NID_NEW or NID_ALLOC */ | |
83 | }; | |
84 | ||
85 | static inline int next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid) | |
86 | { | |
87 | struct f2fs_nm_info *nm_i = NM_I(sbi); | |
88 | struct free_nid *fnid; | |
89 | ||
90 | if (nm_i->fcnt <= 0) | |
91 | return -1; | |
92 | spin_lock(&nm_i->free_nid_list_lock); | |
93 | fnid = list_entry(nm_i->free_nid_list.next, struct free_nid, list); | |
94 | *nid = fnid->nid; | |
95 | spin_unlock(&nm_i->free_nid_list_lock); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | /* | |
100 | * inline functions | |
101 | */ | |
102 | static inline void get_nat_bitmap(struct f2fs_sb_info *sbi, void *addr) | |
103 | { | |
104 | struct f2fs_nm_info *nm_i = NM_I(sbi); | |
105 | memcpy(addr, nm_i->nat_bitmap, nm_i->bitmap_size); | |
106 | } | |
107 | ||
108 | static inline pgoff_t current_nat_addr(struct f2fs_sb_info *sbi, nid_t start) | |
109 | { | |
110 | struct f2fs_nm_info *nm_i = NM_I(sbi); | |
111 | pgoff_t block_off; | |
112 | pgoff_t block_addr; | |
113 | int seg_off; | |
114 | ||
115 | block_off = NAT_BLOCK_OFFSET(start); | |
116 | seg_off = block_off >> sbi->log_blocks_per_seg; | |
117 | ||
118 | block_addr = (pgoff_t)(nm_i->nat_blkaddr + | |
119 | (seg_off << sbi->log_blocks_per_seg << 1) + | |
120 | (block_off & ((1 << sbi->log_blocks_per_seg) - 1))); | |
121 | ||
122 | if (f2fs_test_bit(block_off, nm_i->nat_bitmap)) | |
123 | block_addr += sbi->blocks_per_seg; | |
124 | ||
125 | return block_addr; | |
126 | } | |
127 | ||
128 | static inline pgoff_t next_nat_addr(struct f2fs_sb_info *sbi, | |
129 | pgoff_t block_addr) | |
130 | { | |
131 | struct f2fs_nm_info *nm_i = NM_I(sbi); | |
132 | ||
133 | block_addr -= nm_i->nat_blkaddr; | |
134 | if ((block_addr >> sbi->log_blocks_per_seg) % 2) | |
135 | block_addr -= sbi->blocks_per_seg; | |
136 | else | |
137 | block_addr += sbi->blocks_per_seg; | |
138 | ||
139 | return block_addr + nm_i->nat_blkaddr; | |
140 | } | |
141 | ||
142 | static inline void set_to_next_nat(struct f2fs_nm_info *nm_i, nid_t start_nid) | |
143 | { | |
144 | unsigned int block_off = NAT_BLOCK_OFFSET(start_nid); | |
145 | ||
146 | if (f2fs_test_bit(block_off, nm_i->nat_bitmap)) | |
147 | f2fs_clear_bit(block_off, nm_i->nat_bitmap); | |
148 | else | |
149 | f2fs_set_bit(block_off, nm_i->nat_bitmap); | |
150 | } | |
151 | ||
152 | static inline void fill_node_footer(struct page *page, nid_t nid, | |
153 | nid_t ino, unsigned int ofs, bool reset) | |
154 | { | |
155 | void *kaddr = page_address(page); | |
156 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
157 | if (reset) | |
158 | memset(rn, 0, sizeof(*rn)); | |
159 | rn->footer.nid = cpu_to_le32(nid); | |
160 | rn->footer.ino = cpu_to_le32(ino); | |
161 | rn->footer.flag = cpu_to_le32(ofs << OFFSET_BIT_SHIFT); | |
162 | } | |
163 | ||
164 | static inline void copy_node_footer(struct page *dst, struct page *src) | |
165 | { | |
166 | void *src_addr = page_address(src); | |
167 | void *dst_addr = page_address(dst); | |
168 | struct f2fs_node *src_rn = (struct f2fs_node *)src_addr; | |
169 | struct f2fs_node *dst_rn = (struct f2fs_node *)dst_addr; | |
170 | memcpy(&dst_rn->footer, &src_rn->footer, sizeof(struct node_footer)); | |
171 | } | |
172 | ||
173 | static inline void fill_node_footer_blkaddr(struct page *page, block_t blkaddr) | |
174 | { | |
175 | struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb); | |
176 | struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi); | |
177 | void *kaddr = page_address(page); | |
178 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
179 | rn->footer.cp_ver = ckpt->checkpoint_ver; | |
25ca923b | 180 | rn->footer.next_blkaddr = cpu_to_le32(blkaddr); |
39a53e0c JK |
181 | } |
182 | ||
183 | static inline nid_t ino_of_node(struct page *node_page) | |
184 | { | |
185 | void *kaddr = page_address(node_page); | |
186 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
187 | return le32_to_cpu(rn->footer.ino); | |
188 | } | |
189 | ||
190 | static inline nid_t nid_of_node(struct page *node_page) | |
191 | { | |
192 | void *kaddr = page_address(node_page); | |
193 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
194 | return le32_to_cpu(rn->footer.nid); | |
195 | } | |
196 | ||
197 | static inline unsigned int ofs_of_node(struct page *node_page) | |
198 | { | |
199 | void *kaddr = page_address(node_page); | |
200 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
201 | unsigned flag = le32_to_cpu(rn->footer.flag); | |
202 | return flag >> OFFSET_BIT_SHIFT; | |
203 | } | |
204 | ||
205 | static inline unsigned long long cpver_of_node(struct page *node_page) | |
206 | { | |
207 | void *kaddr = page_address(node_page); | |
208 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
209 | return le64_to_cpu(rn->footer.cp_ver); | |
210 | } | |
211 | ||
212 | static inline block_t next_blkaddr_of_node(struct page *node_page) | |
213 | { | |
214 | void *kaddr = page_address(node_page); | |
215 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
216 | return le32_to_cpu(rn->footer.next_blkaddr); | |
217 | } | |
218 | ||
219 | /* | |
220 | * f2fs assigns the following node offsets described as (num). | |
221 | * N = NIDS_PER_BLOCK | |
222 | * | |
223 | * Inode block (0) | |
224 | * |- direct node (1) | |
225 | * |- direct node (2) | |
226 | * |- indirect node (3) | |
227 | * | `- direct node (4 => 4 + N - 1) | |
228 | * |- indirect node (4 + N) | |
229 | * | `- direct node (5 + N => 5 + 2N - 1) | |
230 | * `- double indirect node (5 + 2N) | |
231 | * `- indirect node (6 + 2N) | |
232 | * `- direct node (x(N + 1)) | |
233 | */ | |
234 | static inline bool IS_DNODE(struct page *node_page) | |
235 | { | |
236 | unsigned int ofs = ofs_of_node(node_page); | |
237 | if (ofs == 3 || ofs == 4 + NIDS_PER_BLOCK || | |
238 | ofs == 5 + 2 * NIDS_PER_BLOCK) | |
239 | return false; | |
240 | if (ofs >= 6 + 2 * NIDS_PER_BLOCK) { | |
241 | ofs -= 6 + 2 * NIDS_PER_BLOCK; | |
242 | if ((long int)ofs % (NIDS_PER_BLOCK + 1)) | |
243 | return false; | |
244 | } | |
245 | return true; | |
246 | } | |
247 | ||
248 | static inline void set_nid(struct page *p, int off, nid_t nid, bool i) | |
249 | { | |
250 | struct f2fs_node *rn = (struct f2fs_node *)page_address(p); | |
251 | ||
252 | wait_on_page_writeback(p); | |
253 | ||
254 | if (i) | |
255 | rn->i.i_nid[off - NODE_DIR1_BLOCK] = cpu_to_le32(nid); | |
256 | else | |
257 | rn->in.nid[off] = cpu_to_le32(nid); | |
258 | set_page_dirty(p); | |
259 | } | |
260 | ||
261 | static inline nid_t get_nid(struct page *p, int off, bool i) | |
262 | { | |
263 | struct f2fs_node *rn = (struct f2fs_node *)page_address(p); | |
264 | if (i) | |
265 | return le32_to_cpu(rn->i.i_nid[off - NODE_DIR1_BLOCK]); | |
266 | return le32_to_cpu(rn->in.nid[off]); | |
267 | } | |
268 | ||
269 | /* | |
270 | * Coldness identification: | |
271 | * - Mark cold files in f2fs_inode_info | |
272 | * - Mark cold node blocks in their node footer | |
273 | * - Mark cold data pages in page cache | |
274 | */ | |
275 | static inline int is_cold_file(struct inode *inode) | |
276 | { | |
277 | return F2FS_I(inode)->i_advise & FADVISE_COLD_BIT; | |
278 | } | |
279 | ||
280 | static inline int is_cold_data(struct page *page) | |
281 | { | |
282 | return PageChecked(page); | |
283 | } | |
284 | ||
285 | static inline void set_cold_data(struct page *page) | |
286 | { | |
287 | SetPageChecked(page); | |
288 | } | |
289 | ||
290 | static inline void clear_cold_data(struct page *page) | |
291 | { | |
292 | ClearPageChecked(page); | |
293 | } | |
294 | ||
295 | static inline int is_cold_node(struct page *page) | |
296 | { | |
297 | void *kaddr = page_address(page); | |
298 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
299 | unsigned int flag = le32_to_cpu(rn->footer.flag); | |
300 | return flag & (0x1 << COLD_BIT_SHIFT); | |
301 | } | |
302 | ||
303 | static inline unsigned char is_fsync_dnode(struct page *page) | |
304 | { | |
305 | void *kaddr = page_address(page); | |
306 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
307 | unsigned int flag = le32_to_cpu(rn->footer.flag); | |
308 | return flag & (0x1 << FSYNC_BIT_SHIFT); | |
309 | } | |
310 | ||
311 | static inline unsigned char is_dent_dnode(struct page *page) | |
312 | { | |
313 | void *kaddr = page_address(page); | |
314 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
315 | unsigned int flag = le32_to_cpu(rn->footer.flag); | |
316 | return flag & (0x1 << DENT_BIT_SHIFT); | |
317 | } | |
318 | ||
319 | static inline void set_cold_node(struct inode *inode, struct page *page) | |
320 | { | |
321 | struct f2fs_node *rn = (struct f2fs_node *)page_address(page); | |
322 | unsigned int flag = le32_to_cpu(rn->footer.flag); | |
323 | ||
324 | if (S_ISDIR(inode->i_mode)) | |
325 | flag &= ~(0x1 << COLD_BIT_SHIFT); | |
326 | else | |
327 | flag |= (0x1 << COLD_BIT_SHIFT); | |
328 | rn->footer.flag = cpu_to_le32(flag); | |
329 | } | |
330 | ||
331 | static inline void set_fsync_mark(struct page *page, int mark) | |
332 | { | |
333 | void *kaddr = page_address(page); | |
334 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
335 | unsigned int flag = le32_to_cpu(rn->footer.flag); | |
336 | if (mark) | |
337 | flag |= (0x1 << FSYNC_BIT_SHIFT); | |
338 | else | |
339 | flag &= ~(0x1 << FSYNC_BIT_SHIFT); | |
340 | rn->footer.flag = cpu_to_le32(flag); | |
341 | } | |
342 | ||
343 | static inline void set_dentry_mark(struct page *page, int mark) | |
344 | { | |
345 | void *kaddr = page_address(page); | |
346 | struct f2fs_node *rn = (struct f2fs_node *)kaddr; | |
347 | unsigned int flag = le32_to_cpu(rn->footer.flag); | |
348 | if (mark) | |
349 | flag |= (0x1 << DENT_BIT_SHIFT); | |
350 | else | |
351 | flag &= ~(0x1 << DENT_BIT_SHIFT); | |
352 | rn->footer.flag = cpu_to_le32(flag); | |
353 | } |