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Jaegeuk Kimdd318662012-11-02 17:06:26 +09001/**
2 * include/linux/f2fs_fs.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#ifndef _LINUX_F2FS_FS_H
12#define _LINUX_F2FS_FS_H
13
14#include <linux/pagemap.h>
15#include <linux/types.h>
16
17#define F2FS_SUPER_OFFSET 1024 /* byte-size offset */
18#define F2FS_LOG_SECTOR_SIZE 9 /* 9 bits for 512 byte */
19#define F2FS_LOG_SECTORS_PER_BLOCK 3 /* 4KB: F2FS_BLKSIZE */
20#define F2FS_BLKSIZE 4096 /* support only 4KB block */
21#define F2FS_MAX_EXTENSION 64 /* # of extension entries */
22
23#define NULL_ADDR 0x0U
24#define NEW_ADDR -1U
25
26#define F2FS_ROOT_INO(sbi) (sbi->root_ino_num)
27#define F2FS_NODE_INO(sbi) (sbi->node_ino_num)
28#define F2FS_META_INO(sbi) (sbi->meta_ino_num)
29
30/* This flag is used by node and meta inodes, and by recovery */
31#define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO)
32
33/*
34 * For further optimization on multi-head logs, on-disk layout supports maximum
35 * 16 logs by default. The number, 16, is expected to cover all the cases
36 * enoughly. The implementaion currently uses no more than 6 logs.
37 * Half the logs are used for nodes, and the other half are used for data.
38 */
39#define MAX_ACTIVE_LOGS 16
40#define MAX_ACTIVE_NODE_LOGS 8
41#define MAX_ACTIVE_DATA_LOGS 8
42
43/*
44 * For superblock
45 */
46struct f2fs_super_block {
47 __le32 magic; /* Magic Number */
48 __le16 major_ver; /* Major Version */
49 __le16 minor_ver; /* Minor Version */
50 __le32 log_sectorsize; /* log2 sector size in bytes */
51 __le32 log_sectors_per_block; /* log2 # of sectors per block */
52 __le32 log_blocksize; /* log2 block size in bytes */
53 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */
54 __le32 segs_per_sec; /* # of segments per section */
55 __le32 secs_per_zone; /* # of sections per zone */
56 __le32 checksum_offset; /* checksum offset inside super block */
57 __le64 block_count; /* total # of user blocks */
58 __le32 section_count; /* total # of sections */
59 __le32 segment_count; /* total # of segments */
60 __le32 segment_count_ckpt; /* # of segments for checkpoint */
61 __le32 segment_count_sit; /* # of segments for SIT */
62 __le32 segment_count_nat; /* # of segments for NAT */
63 __le32 segment_count_ssa; /* # of segments for SSA */
64 __le32 segment_count_main; /* # of segments for main area */
65 __le32 segment0_blkaddr; /* start block address of segment 0 */
66 __le32 cp_blkaddr; /* start block address of checkpoint */
67 __le32 sit_blkaddr; /* start block address of SIT */
68 __le32 nat_blkaddr; /* start block address of NAT */
69 __le32 ssa_blkaddr; /* start block address of SSA */
70 __le32 main_blkaddr; /* start block address of main area */
71 __le32 root_ino; /* root inode number */
72 __le32 node_ino; /* node inode number */
73 __le32 meta_ino; /* meta inode number */
74 __u8 uuid[16]; /* 128-bit uuid for volume */
75 __le16 volume_name[512]; /* volume name */
76 __le32 extension_count; /* # of extensions below */
77 __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */
78} __packed;
79
80/*
81 * For checkpoint
82 */
83#define CP_ERROR_FLAG 0x00000008
84#define CP_COMPACT_SUM_FLAG 0x00000004
85#define CP_ORPHAN_PRESENT_FLAG 0x00000002
86#define CP_UMOUNT_FLAG 0x00000001
87
88struct f2fs_checkpoint {
89 __le64 checkpoint_ver; /* checkpoint block version number */
90 __le64 user_block_count; /* # of user blocks */
91 __le64 valid_block_count; /* # of valid blocks in main area */
92 __le32 rsvd_segment_count; /* # of reserved segments for gc */
93 __le32 overprov_segment_count; /* # of overprovision segments */
94 __le32 free_segment_count; /* # of free segments in main area */
95
96 /* information of current node segments */
97 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
98 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
99 /* information of current data segments */
100 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
101 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
102 __le32 ckpt_flags; /* Flags : umount and journal_present */
103 __le32 cp_pack_total_block_count; /* total # of one cp pack */
104 __le32 cp_pack_start_sum; /* start block number of data summary */
105 __le32 valid_node_count; /* Total number of valid nodes */
106 __le32 valid_inode_count; /* Total number of valid inodes */
107 __le32 next_free_nid; /* Next free node number */
108 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
109 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
110 __le32 checksum_offset; /* checksum offset inside cp block */
111 __le64 elapsed_time; /* mounted time */
112 /* allocation type of current segment */
113 unsigned char alloc_type[MAX_ACTIVE_LOGS];
114
115 /* SIT and NAT version bitmap */
116 unsigned char sit_nat_version_bitmap[1];
117} __packed;
118
119/*
120 * For orphan inode management
121 */
122#define F2FS_ORPHANS_PER_BLOCK 1020
123
124struct f2fs_orphan_block {
125 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */
126 __le32 reserved; /* reserved */
127 __le16 blk_addr; /* block index in current CP */
128 __le16 blk_count; /* Number of orphan inode blocks in CP */
129 __le32 entry_count; /* Total number of orphan nodes in current CP */
130 __le32 check_sum; /* CRC32 for orphan inode block */
131} __packed;
132
133/*
134 * For NODE structure
135 */
136struct f2fs_extent {
137 __le32 fofs; /* start file offset of the extent */
138 __le32 blk_addr; /* start block address of the extent */
139 __le32 len; /* lengh of the extent */
140} __packed;
141
142#define F2FS_MAX_NAME_LEN 256
143#define ADDRS_PER_INODE 923 /* Address Pointers in an Inode */
144#define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */
145#define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */
146
147struct f2fs_inode {
148 __le16 i_mode; /* file mode */
149 __u8 i_advise; /* file hints */
150 __u8 i_reserved; /* reserved */
151 __le32 i_uid; /* user ID */
152 __le32 i_gid; /* group ID */
153 __le32 i_links; /* links count */
154 __le64 i_size; /* file size in bytes */
155 __le64 i_blocks; /* file size in blocks */
156 __le64 i_atime; /* access time */
157 __le64 i_ctime; /* change time */
158 __le64 i_mtime; /* modification time */
159 __le32 i_atime_nsec; /* access time in nano scale */
160 __le32 i_ctime_nsec; /* change time in nano scale */
161 __le32 i_mtime_nsec; /* modification time in nano scale */
162 __le32 i_generation; /* file version (for NFS) */
163 __le32 i_current_depth; /* only for directory depth */
164 __le32 i_xattr_nid; /* nid to save xattr */
165 __le32 i_flags; /* file attributes */
166 __le32 i_pino; /* parent inode number */
167 __le32 i_namelen; /* file name length */
168 __u8 i_name[F2FS_MAX_NAME_LEN]; /* file name for SPOR */
169
170 struct f2fs_extent i_ext; /* caching a largest extent */
171
172 __le32 i_addr[ADDRS_PER_INODE]; /* Pointers to data blocks */
173
174 __le32 i_nid[5]; /* direct(2), indirect(2),
175 double_indirect(1) node id */
176} __packed;
177
178struct direct_node {
179 __le32 addr[ADDRS_PER_BLOCK]; /* array of data block address */
180} __packed;
181
182struct indirect_node {
183 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */
184} __packed;
185
186enum {
187 COLD_BIT_SHIFT = 0,
188 FSYNC_BIT_SHIFT,
189 DENT_BIT_SHIFT,
190 OFFSET_BIT_SHIFT
191};
192
193struct node_footer {
194 __le32 nid; /* node id */
195 __le32 ino; /* inode nunmber */
196 __le32 flag; /* include cold/fsync/dentry marks and offset */
197 __le64 cp_ver; /* checkpoint version */
198 __le32 next_blkaddr; /* next node page block address */
199} __packed;
200
201struct f2fs_node {
202 /* can be one of three types: inode, direct, and indirect types */
203 union {
204 struct f2fs_inode i;
205 struct direct_node dn;
206 struct indirect_node in;
207 };
208 struct node_footer footer;
209} __packed;
210
211/*
212 * For NAT entries
213 */
214#define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
215
216struct f2fs_nat_entry {
217 __u8 version; /* latest version of cached nat entry */
218 __le32 ino; /* inode number */
219 __le32 block_addr; /* block address */
220} __packed;
221
222struct f2fs_nat_block {
223 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
224} __packed;
225
226/*
227 * For SIT entries
228 *
229 * Each segment is 2MB in size by default so that a bitmap for validity of
230 * there-in blocks should occupy 64 bytes, 512 bits.
231 * Not allow to change this.
232 */
233#define SIT_VBLOCK_MAP_SIZE 64
234#define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
235
236/*
237 * Note that f2fs_sit_entry->vblocks has the following bit-field information.
238 * [15:10] : allocation type such as CURSEG_XXXX_TYPE
239 * [9:0] : valid block count
240 */
241#define SIT_VBLOCKS_SHIFT 10
242#define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1)
243#define GET_SIT_VBLOCKS(raw_sit) \
244 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
245#define GET_SIT_TYPE(raw_sit) \
246 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \
247 >> SIT_VBLOCKS_SHIFT)
248
249struct f2fs_sit_entry {
250 __le16 vblocks; /* reference above */
251 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */
252 __le64 mtime; /* segment age for cleaning */
253} __packed;
254
255struct f2fs_sit_block {
256 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
257} __packed;
258
259/*
260 * For segment summary
261 *
262 * One summary block contains exactly 512 summary entries, which represents
263 * exactly 2MB segment by default. Not allow to change the basic units.
264 *
265 * NOTE: For initializing fields, you must use set_summary
266 *
267 * - If data page, nid represents dnode's nid
268 * - If node page, nid represents the node page's nid.
269 *
270 * The ofs_in_node is used by only data page. It represents offset
271 * from node's page's beginning to get a data block address.
272 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
273 */
274#define ENTRIES_IN_SUM 512
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900275#define SUMMARY_SIZE (7) /* sizeof(struct summary) */
276#define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */
Jaegeuk Kimdd318662012-11-02 17:06:26 +0900277#define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM)
278
279/* a summary entry for a 4KB-sized block in a segment */
280struct f2fs_summary {
281 __le32 nid; /* parent node id */
282 union {
283 __u8 reserved[3];
284 struct {
285 __u8 version; /* node version number */
286 __le16 ofs_in_node; /* block index in parent node */
287 } __packed;
288 };
289} __packed;
290
291/* summary block type, node or data, is stored to the summary_footer */
292#define SUM_TYPE_NODE (1)
293#define SUM_TYPE_DATA (0)
294
295struct summary_footer {
296 unsigned char entry_type; /* SUM_TYPE_XXX */
297 __u32 check_sum; /* summary checksum */
298} __packed;
299
Jaegeuk Kim25ca9232012-11-28 16:12:41 +0900300#define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
Jaegeuk Kimdd318662012-11-02 17:06:26 +0900301 SUM_ENTRY_SIZE)
302#define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
303 sizeof(struct nat_journal_entry))
304#define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
305 sizeof(struct nat_journal_entry))
306#define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
307 sizeof(struct sit_journal_entry))
308#define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
309 sizeof(struct sit_journal_entry))
310/*
311 * frequently updated NAT/SIT entries can be stored in the spare area in
312 * summary blocks
313 */
314enum {
315 NAT_JOURNAL = 0,
316 SIT_JOURNAL
317};
318
319struct nat_journal_entry {
320 __le32 nid;
321 struct f2fs_nat_entry ne;
322} __packed;
323
324struct nat_journal {
325 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
326 __u8 reserved[NAT_JOURNAL_RESERVED];
327} __packed;
328
329struct sit_journal_entry {
330 __le32 segno;
331 struct f2fs_sit_entry se;
332} __packed;
333
334struct sit_journal {
335 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
336 __u8 reserved[SIT_JOURNAL_RESERVED];
337} __packed;
338
339/* 4KB-sized summary block structure */
340struct f2fs_summary_block {
341 struct f2fs_summary entries[ENTRIES_IN_SUM];
342 union {
343 __le16 n_nats;
344 __le16 n_sits;
345 };
346 /* spare area is used by NAT or SIT journals */
347 union {
348 struct nat_journal nat_j;
349 struct sit_journal sit_j;
350 };
351 struct summary_footer footer;
352} __packed;
353
354/*
355 * For directory operations
356 */
357#define F2FS_DOT_HASH 0
358#define F2FS_DDOT_HASH F2FS_DOT_HASH
359#define F2FS_MAX_HASH (~((0x3ULL) << 62))
360#define F2FS_HASH_COL_BIT ((0x1ULL) << 63)
361
362typedef __le32 f2fs_hash_t;
363
364/* One directory entry slot covers 8bytes-long file name */
365#define F2FS_NAME_LEN 8
Namjae Jeon457d08e2012-12-08 14:54:50 +0900366#define F2FS_NAME_LEN_BITS 3
367
368#define GET_DENTRY_SLOTS(x) ((x + F2FS_NAME_LEN - 1) >> F2FS_NAME_LEN_BITS)
Jaegeuk Kimdd318662012-11-02 17:06:26 +0900369
370/* the number of dentry in a block */
371#define NR_DENTRY_IN_BLOCK 214
372
373/* MAX level for dir lookup */
374#define MAX_DIR_HASH_DEPTH 63
375
376#define SIZE_OF_DIR_ENTRY 11 /* by byte */
377#define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
378 BITS_PER_BYTE)
379#define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
380 F2FS_NAME_LEN) * \
381 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
382
383/* One directory entry slot representing F2FS_NAME_LEN-sized file name */
384struct f2fs_dir_entry {
385 __le32 hash_code; /* hash code of file name */
386 __le32 ino; /* inode number */
387 __le16 name_len; /* lengh of file name */
388 __u8 file_type; /* file type */
389} __packed;
390
391/* 4KB-sized directory entry block */
392struct f2fs_dentry_block {
393 /* validity bitmap for directory entries in each block */
394 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
395 __u8 reserved[SIZE_OF_RESERVED];
396 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
397 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_NAME_LEN];
398} __packed;
399
400/* file types used in inode_info->flags */
401enum {
402 F2FS_FT_UNKNOWN,
403 F2FS_FT_REG_FILE,
404 F2FS_FT_DIR,
405 F2FS_FT_CHRDEV,
406 F2FS_FT_BLKDEV,
407 F2FS_FT_FIFO,
408 F2FS_FT_SOCK,
409 F2FS_FT_SYMLINK,
410 F2FS_FT_MAX
411};
412
413#endif /* _LINUX_F2FS_FS_H */