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7c1a000d | 1 | // SPDX-License-Identifier: GPL-2.0 |
dd31866b JK |
2 | /** |
3 | * include/linux/f2fs_fs.h | |
4 | * | |
5 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
6 | * http://www.samsung.com/ | |
dd31866b JK |
7 | */ |
8 | #ifndef _LINUX_F2FS_FS_H | |
9 | #define _LINUX_F2FS_FS_H | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/types.h> | |
13 | ||
14 | #define F2FS_SUPER_OFFSET 1024 /* byte-size offset */ | |
55cf9cb6 CY |
15 | #define F2FS_MIN_LOG_SECTOR_SIZE 9 /* 9 bits for 512 bytes */ |
16 | #define F2FS_MAX_LOG_SECTOR_SIZE 12 /* 12 bits for 4096 bytes */ | |
17 | #define F2FS_LOG_SECTORS_PER_BLOCK 3 /* log number for sector/blk */ | |
dd31866b | 18 | #define F2FS_BLKSIZE 4096 /* support only 4KB block */ |
f7ef9b83 | 19 | #define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */ |
dd31866b | 20 | #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ |
846ae671 | 21 | #define F2FS_EXTENSION_LEN 8 /* max size of extension */ |
24b84912 | 22 | #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS) |
dd31866b | 23 | |
a9841c4d JK |
24 | #define NULL_ADDR ((block_t)0) /* used as block_t addresses */ |
25 | #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */ | |
4c8ff709 | 26 | #define COMPRESS_ADDR ((block_t)-2) /* used as compressed data flag */ |
dd31866b | 27 | |
f7ef9b83 JK |
28 | #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS) |
29 | #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS) | |
30 | ||
c200b1aa CY |
31 | /* 0, 1(node nid), 2(meta nid) are reserved node id */ |
32 | #define F2FS_RESERVED_NODE_NUM 3 | |
33 | ||
29fa6c56 JK |
34 | #define F2FS_ROOT_INO(sbi) ((sbi)->root_ino_num) |
35 | #define F2FS_NODE_INO(sbi) ((sbi)->node_ino_num) | |
36 | #define F2FS_META_INO(sbi) ((sbi)->meta_ino_num) | |
6ce19aff | 37 | #define F2FS_COMPRESS_INO(sbi) (NM_I(sbi)->max_nid) |
dd31866b | 38 | |
234a9689 JK |
39 | #define F2FS_MAX_QUOTAS 3 |
40 | ||
5aba5430 | 41 | #define F2FS_ENC_UTF8_12_1 1 |
5aba5430 | 42 | |
447286eb YL |
43 | #define F2FS_IO_SIZE(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */ |
44 | #define F2FS_IO_SIZE_KB(sbi) BIT(F2FS_OPTION(sbi).write_io_size_bits + 2) /* KB */ | |
63189b78 | 45 | #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */ |
0a595eba | 46 | #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1) |
c72db71e | 47 | #define F2FS_IO_ALIGNED(sbi) (F2FS_IO_SIZE(sbi) > 1) |
0a595eba | 48 | |
dd31866b | 49 | /* This flag is used by node and meta inodes, and by recovery */ |
a78186eb | 50 | #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO) |
dd31866b JK |
51 | |
52 | /* | |
53 | * For further optimization on multi-head logs, on-disk layout supports maximum | |
54 | * 16 logs by default. The number, 16, is expected to cover all the cases | |
55 | * enoughly. The implementaion currently uses no more than 6 logs. | |
56 | * Half the logs are used for nodes, and the other half are used for data. | |
57 | */ | |
58 | #define MAX_ACTIVE_LOGS 16 | |
59 | #define MAX_ACTIVE_NODE_LOGS 8 | |
60 | #define MAX_ACTIVE_DATA_LOGS 8 | |
61 | ||
0040b933 | 62 | #define VERSION_LEN 256 |
a11fac37 | 63 | #define MAX_VOLUME_NAME 512 |
3c62be17 JK |
64 | #define MAX_PATH_LEN 64 |
65 | #define MAX_DEVICES 8 | |
0040b933 | 66 | |
dd31866b JK |
67 | /* |
68 | * For superblock | |
69 | */ | |
3c62be17 JK |
70 | struct f2fs_device { |
71 | __u8 path[MAX_PATH_LEN]; | |
72 | __le32 total_segments; | |
73 | } __packed; | |
74 | ||
a9cfee0e CY |
75 | /* reason of stop_checkpoint */ |
76 | enum stop_cp_reason { | |
77 | STOP_CP_REASON_SHUTDOWN, | |
78 | STOP_CP_REASON_FAULT_INJECT, | |
79 | STOP_CP_REASON_META_PAGE, | |
80 | STOP_CP_REASON_WRITE_FAIL, | |
81 | STOP_CP_REASON_CORRUPTED_SUMMARY, | |
82 | STOP_CP_REASON_UPDATE_INODE, | |
83 | STOP_CP_REASON_FLUSH_FAIL, | |
84 | STOP_CP_REASON_MAX, | |
85 | }; | |
86 | ||
87 | #define MAX_STOP_REASON 32 | |
88 | ||
95fa90c9 CY |
89 | /* detail reason for EFSCORRUPTED */ |
90 | enum f2fs_error { | |
91 | ERROR_CORRUPTED_CLUSTER, | |
92 | ERROR_FAIL_DECOMPRESSION, | |
93 | ERROR_INVALID_BLKADDR, | |
94 | ERROR_CORRUPTED_DIRENT, | |
95 | ERROR_CORRUPTED_INODE, | |
96 | ERROR_INCONSISTENT_SUMMARY, | |
97 | ERROR_INCONSISTENT_FOOTER, | |
98 | ERROR_INCONSISTENT_SUM_TYPE, | |
99 | ERROR_CORRUPTED_JOURNAL, | |
100 | ERROR_INCONSISTENT_NODE_COUNT, | |
101 | ERROR_INCONSISTENT_BLOCK_COUNT, | |
102 | ERROR_INVALID_CURSEG, | |
103 | ERROR_INCONSISTENT_SIT, | |
104 | ERROR_CORRUPTED_VERITY_XATTR, | |
105 | ERROR_CORRUPTED_XATTR, | |
106 | ERROR_MAX, | |
107 | }; | |
108 | ||
109 | #define MAX_F2FS_ERRORS 16 | |
110 | ||
dd31866b JK |
111 | struct f2fs_super_block { |
112 | __le32 magic; /* Magic Number */ | |
113 | __le16 major_ver; /* Major Version */ | |
114 | __le16 minor_ver; /* Minor Version */ | |
115 | __le32 log_sectorsize; /* log2 sector size in bytes */ | |
116 | __le32 log_sectors_per_block; /* log2 # of sectors per block */ | |
117 | __le32 log_blocksize; /* log2 block size in bytes */ | |
118 | __le32 log_blocks_per_seg; /* log2 # of blocks per segment */ | |
119 | __le32 segs_per_sec; /* # of segments per section */ | |
120 | __le32 secs_per_zone; /* # of sections per zone */ | |
121 | __le32 checksum_offset; /* checksum offset inside super block */ | |
122 | __le64 block_count; /* total # of user blocks */ | |
123 | __le32 section_count; /* total # of sections */ | |
124 | __le32 segment_count; /* total # of segments */ | |
125 | __le32 segment_count_ckpt; /* # of segments for checkpoint */ | |
126 | __le32 segment_count_sit; /* # of segments for SIT */ | |
127 | __le32 segment_count_nat; /* # of segments for NAT */ | |
128 | __le32 segment_count_ssa; /* # of segments for SSA */ | |
129 | __le32 segment_count_main; /* # of segments for main area */ | |
130 | __le32 segment0_blkaddr; /* start block address of segment 0 */ | |
131 | __le32 cp_blkaddr; /* start block address of checkpoint */ | |
132 | __le32 sit_blkaddr; /* start block address of SIT */ | |
133 | __le32 nat_blkaddr; /* start block address of NAT */ | |
134 | __le32 ssa_blkaddr; /* start block address of SSA */ | |
135 | __le32 main_blkaddr; /* start block address of main area */ | |
136 | __le32 root_ino; /* root inode number */ | |
137 | __le32 node_ino; /* node inode number */ | |
138 | __le32 meta_ino; /* meta inode number */ | |
139 | __u8 uuid[16]; /* 128-bit uuid for volume */ | |
a11fac37 | 140 | __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ |
dd31866b | 141 | __le32 extension_count; /* # of extensions below */ |
846ae671 | 142 | __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ |
1dbe4152 | 143 | __le32 cp_payload; |
0040b933 JK |
144 | __u8 version[VERSION_LEN]; /* the kernel version */ |
145 | __u8 init_version[VERSION_LEN]; /* the initial kernel version */ | |
76f105a2 | 146 | __le32 feature; /* defined features */ |
cde4de12 JK |
147 | __u8 encryption_level; /* versioning level for encryption */ |
148 | __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */ | |
3c62be17 | 149 | struct f2fs_device devs[MAX_DEVICES]; /* device list */ |
234a9689 | 150 | __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */ |
b6a06cbb | 151 | __u8 hot_ext_count; /* # of hot file extension */ |
5aba5430 DR |
152 | __le16 s_encoding; /* Filename charset encoding */ |
153 | __le16 s_encoding_flags; /* Filename charset encoding flags */ | |
a9cfee0e | 154 | __u8 s_stop_reason[MAX_STOP_REASON]; /* stop checkpoint reason */ |
95fa90c9 CY |
155 | __u8 s_errors[MAX_F2FS_ERRORS]; /* reason of image corrupts */ |
156 | __u8 reserved[258]; /* valid reserved region */ | |
d440c52d | 157 | __le32 crc; /* checksum of superblock */ |
dd31866b JK |
158 | } __packed; |
159 | ||
160 | /* | |
161 | * For checkpoint | |
162 | */ | |
c84ef3c5 | 163 | #define CP_RESIZEFS_FLAG 0x00004000 |
db610a64 | 164 | #define CP_DISABLED_QUICK_FLAG 0x00002000 |
4354994f | 165 | #define CP_DISABLED_FLAG 0x00001000 |
af033b2a | 166 | #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800 |
199bc3fe | 167 | #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400 |
f2367923 | 168 | #define CP_NOCRC_RECOVERY_FLAG 0x00000200 |
1f43e2ad | 169 | #define CP_TRIMMED_FLAG 0x00000100 |
22ad0b6a | 170 | #define CP_NAT_BITS_FLAG 0x00000080 |
a468f0ef | 171 | #define CP_CRC_RECOVERY_FLAG 0x00000040 |
119ee914 | 172 | #define CP_FASTBOOT_FLAG 0x00000020 |
2ae4c673 | 173 | #define CP_FSCK_FLAG 0x00000010 |
dd31866b JK |
174 | #define CP_ERROR_FLAG 0x00000008 |
175 | #define CP_COMPACT_SUM_FLAG 0x00000004 | |
176 | #define CP_ORPHAN_PRESENT_FLAG 0x00000002 | |
177 | #define CP_UMOUNT_FLAG 0x00000001 | |
178 | ||
b5b82205 CY |
179 | #define F2FS_CP_PACKS 2 /* # of checkpoint packs */ |
180 | ||
dd31866b JK |
181 | struct f2fs_checkpoint { |
182 | __le64 checkpoint_ver; /* checkpoint block version number */ | |
183 | __le64 user_block_count; /* # of user blocks */ | |
184 | __le64 valid_block_count; /* # of valid blocks in main area */ | |
185 | __le32 rsvd_segment_count; /* # of reserved segments for gc */ | |
186 | __le32 overprov_segment_count; /* # of overprovision segments */ | |
187 | __le32 free_segment_count; /* # of free segments in main area */ | |
188 | ||
189 | /* information of current node segments */ | |
190 | __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS]; | |
191 | __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; | |
192 | /* information of current data segments */ | |
193 | __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS]; | |
194 | __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; | |
195 | __le32 ckpt_flags; /* Flags : umount and journal_present */ | |
196 | __le32 cp_pack_total_block_count; /* total # of one cp pack */ | |
197 | __le32 cp_pack_start_sum; /* start block number of data summary */ | |
198 | __le32 valid_node_count; /* Total number of valid nodes */ | |
199 | __le32 valid_inode_count; /* Total number of valid inodes */ | |
200 | __le32 next_free_nid; /* Next free node number */ | |
201 | __le32 sit_ver_bitmap_bytesize; /* Default value 64 */ | |
202 | __le32 nat_ver_bitmap_bytesize; /* Default value 256 */ | |
203 | __le32 checksum_offset; /* checksum offset inside cp block */ | |
204 | __le64 elapsed_time; /* mounted time */ | |
205 | /* allocation type of current segment */ | |
206 | unsigned char alloc_type[MAX_ACTIVE_LOGS]; | |
207 | ||
208 | /* SIT and NAT version bitmap */ | |
4260c406 | 209 | unsigned char sit_nat_version_bitmap[]; |
dd31866b JK |
210 | } __packed; |
211 | ||
d7eb8f1c CY |
212 | #define CP_CHKSUM_OFFSET 4092 /* default chksum offset in checkpoint */ |
213 | #define CP_MIN_CHKSUM_OFFSET \ | |
214 | (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap)) | |
215 | ||
dd31866b JK |
216 | /* |
217 | * For orphan inode management | |
218 | */ | |
219 | #define F2FS_ORPHANS_PER_BLOCK 1020 | |
220 | ||
29fa6c56 | 221 | #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \ |
b5b82205 CY |
222 | F2FS_ORPHANS_PER_BLOCK) |
223 | ||
dd31866b JK |
224 | struct f2fs_orphan_block { |
225 | __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */ | |
226 | __le32 reserved; /* reserved */ | |
227 | __le16 blk_addr; /* block index in current CP */ | |
228 | __le16 blk_count; /* Number of orphan inode blocks in CP */ | |
229 | __le32 entry_count; /* Total number of orphan nodes in current CP */ | |
230 | __le32 check_sum; /* CRC32 for orphan inode block */ | |
231 | } __packed; | |
232 | ||
233 | /* | |
234 | * For NODE structure | |
235 | */ | |
236 | struct f2fs_extent { | |
237 | __le32 fofs; /* start file offset of the extent */ | |
4d0b0bd4 | 238 | __le32 blk; /* start block address of the extent */ |
1ffdc380 | 239 | __le32 len; /* length of the extent */ |
dd31866b JK |
240 | } __packed; |
241 | ||
5a20d339 | 242 | #define F2FS_NAME_LEN 255 |
6afc662e CY |
243 | /* 200 bytes for inline xattrs by default */ |
244 | #define DEFAULT_INLINE_XATTR_ADDRS 50 | |
de93653f | 245 | #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */ |
7a2af766 CY |
246 | #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \ |
247 | get_extra_isize(inode)) | |
b5b82205 | 248 | #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */ |
81ca7350 | 249 | #define ADDRS_PER_INODE(inode) addrs_per_inode(inode) |
d02a6e61 CY |
250 | #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */ |
251 | #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode) | |
de93653f JK |
252 | #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */ |
253 | ||
81ca7350 | 254 | #define ADDRS_PER_PAGE(page, inode) \ |
d02a6e61 | 255 | (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode)) |
6403eb1f | 256 | |
de93653f JK |
257 | #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) |
258 | #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) | |
259 | #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) | |
260 | #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) | |
261 | #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) | |
dd31866b | 262 | |
444c580f | 263 | #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */ |
1001b347 | 264 | #define F2FS_INLINE_DATA 0x02 /* file inline data flag */ |
34d67deb | 265 | #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */ |
b3d208f9 | 266 | #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */ |
510022a8 | 267 | #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */ |
7a2af766 | 268 | #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */ |
1ad71a27 | 269 | #define F2FS_PIN_FILE 0x40 /* file should not be gced */ |
c6140415 | 270 | #define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */ |
1001b347 | 271 | |
dd31866b JK |
272 | struct f2fs_inode { |
273 | __le16 i_mode; /* file mode */ | |
274 | __u8 i_advise; /* file hints */ | |
444c580f | 275 | __u8 i_inline; /* file inline flags */ |
dd31866b JK |
276 | __le32 i_uid; /* user ID */ |
277 | __le32 i_gid; /* group ID */ | |
278 | __le32 i_links; /* links count */ | |
279 | __le64 i_size; /* file size in bytes */ | |
280 | __le64 i_blocks; /* file size in blocks */ | |
281 | __le64 i_atime; /* access time */ | |
282 | __le64 i_ctime; /* change time */ | |
283 | __le64 i_mtime; /* modification time */ | |
284 | __le32 i_atime_nsec; /* access time in nano scale */ | |
285 | __le32 i_ctime_nsec; /* change time in nano scale */ | |
286 | __le32 i_mtime_nsec; /* modification time in nano scale */ | |
287 | __le32 i_generation; /* file version (for NFS) */ | |
1ad71a27 JK |
288 | union { |
289 | __le32 i_current_depth; /* only for directory depth */ | |
290 | __le16 i_gc_failures; /* | |
291 | * # of gc failures on pinned file. | |
292 | * only for regular files. | |
293 | */ | |
294 | }; | |
dd31866b JK |
295 | __le32 i_xattr_nid; /* nid to save xattr */ |
296 | __le32 i_flags; /* file attributes */ | |
297 | __le32 i_pino; /* parent inode number */ | |
298 | __le32 i_namelen; /* file name length */ | |
5a20d339 | 299 | __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */ |
38431545 | 300 | __u8 i_dir_level; /* dentry_level for large dir */ |
dd31866b JK |
301 | |
302 | struct f2fs_extent i_ext; /* caching a largest extent */ | |
303 | ||
7a2af766 CY |
304 | union { |
305 | struct { | |
306 | __le16 i_extra_isize; /* extra inode attribute size */ | |
6afc662e | 307 | __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */ |
5c57132e | 308 | __le32 i_projid; /* project id */ |
704956ec | 309 | __le32 i_inode_checksum;/* inode meta checksum */ |
1c1d35df CY |
310 | __le64 i_crtime; /* creation time */ |
311 | __le32 i_crtime_nsec; /* creation time in nano scale */ | |
4c8ff709 CY |
312 | __le64 i_compr_blocks; /* # of compressed blocks */ |
313 | __u8 i_compress_algorithm; /* compress algorithm */ | |
314 | __u8 i_log_cluster_size; /* log of cluster size */ | |
b28f047b | 315 | __le16 i_compress_flag; /* compress flag */ |
3fde13f8 | 316 | /* 0 bit: chksum flag |
c1085957 | 317 | * [8,15] bits: compress level |
3fde13f8 | 318 | */ |
7a2af766 | 319 | __le32 i_extra_end[0]; /* for attribute size calculation */ |
1c1d35df | 320 | } __packed; |
7a2af766 CY |
321 | __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */ |
322 | }; | |
b5b82205 | 323 | __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2), |
dd31866b JK |
324 | double_indirect(1) node id */ |
325 | } __packed; | |
326 | ||
327 | struct direct_node { | |
d02a6e61 | 328 | __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */ |
dd31866b JK |
329 | } __packed; |
330 | ||
331 | struct indirect_node { | |
332 | __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */ | |
333 | } __packed; | |
334 | ||
335 | enum { | |
336 | COLD_BIT_SHIFT = 0, | |
337 | FSYNC_BIT_SHIFT, | |
338 | DENT_BIT_SHIFT, | |
339 | OFFSET_BIT_SHIFT | |
340 | }; | |
341 | ||
447286eb | 342 | #define OFFSET_BIT_MASK GENMASK(OFFSET_BIT_SHIFT - 1, 0) |
09eb483e | 343 | |
dd31866b JK |
344 | struct node_footer { |
345 | __le32 nid; /* node id */ | |
68b79cdc | 346 | __le32 ino; /* inode number */ |
dd31866b JK |
347 | __le32 flag; /* include cold/fsync/dentry marks and offset */ |
348 | __le64 cp_ver; /* checkpoint version */ | |
349 | __le32 next_blkaddr; /* next node page block address */ | |
350 | } __packed; | |
351 | ||
352 | struct f2fs_node { | |
353 | /* can be one of three types: inode, direct, and indirect types */ | |
354 | union { | |
355 | struct f2fs_inode i; | |
356 | struct direct_node dn; | |
357 | struct indirect_node in; | |
358 | }; | |
359 | struct node_footer footer; | |
360 | } __packed; | |
361 | ||
362 | /* | |
363 | * For NAT entries | |
364 | */ | |
09cbfeaf | 365 | #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry)) |
dd31866b JK |
366 | |
367 | struct f2fs_nat_entry { | |
368 | __u8 version; /* latest version of cached nat entry */ | |
369 | __le32 ino; /* inode number */ | |
370 | __le32 block_addr; /* block address */ | |
371 | } __packed; | |
372 | ||
373 | struct f2fs_nat_block { | |
374 | struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK]; | |
375 | } __packed; | |
376 | ||
377 | /* | |
378 | * For SIT entries | |
379 | * | |
380 | * Each segment is 2MB in size by default so that a bitmap for validity of | |
381 | * there-in blocks should occupy 64 bytes, 512 bits. | |
382 | * Not allow to change this. | |
383 | */ | |
384 | #define SIT_VBLOCK_MAP_SIZE 64 | |
09cbfeaf | 385 | #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry)) |
dd31866b | 386 | |
b9dd4618 JQ |
387 | /* |
388 | * F2FS uses 4 bytes to represent block address. As a result, supported size of | |
389 | * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments. | |
390 | */ | |
391 | #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2) | |
392 | ||
dd31866b JK |
393 | /* |
394 | * Note that f2fs_sit_entry->vblocks has the following bit-field information. | |
395 | * [15:10] : allocation type such as CURSEG_XXXX_TYPE | |
396 | * [9:0] : valid block count | |
397 | */ | |
398 | #define SIT_VBLOCKS_SHIFT 10 | |
399 | #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1) | |
400 | #define GET_SIT_VBLOCKS(raw_sit) \ | |
401 | (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK) | |
402 | #define GET_SIT_TYPE(raw_sit) \ | |
403 | ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \ | |
404 | >> SIT_VBLOCKS_SHIFT) | |
405 | ||
406 | struct f2fs_sit_entry { | |
407 | __le16 vblocks; /* reference above */ | |
408 | __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */ | |
409 | __le64 mtime; /* segment age for cleaning */ | |
410 | } __packed; | |
411 | ||
412 | struct f2fs_sit_block { | |
413 | struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK]; | |
414 | } __packed; | |
415 | ||
416 | /* | |
417 | * For segment summary | |
418 | * | |
419 | * One summary block contains exactly 512 summary entries, which represents | |
420 | * exactly 2MB segment by default. Not allow to change the basic units. | |
421 | * | |
422 | * NOTE: For initializing fields, you must use set_summary | |
423 | * | |
424 | * - If data page, nid represents dnode's nid | |
425 | * - If node page, nid represents the node page's nid. | |
426 | * | |
427 | * The ofs_in_node is used by only data page. It represents offset | |
428 | * from node's page's beginning to get a data block address. | |
429 | * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node) | |
430 | */ | |
431 | #define ENTRIES_IN_SUM 512 | |
25ca923b JK |
432 | #define SUMMARY_SIZE (7) /* sizeof(struct summary) */ |
433 | #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */ | |
dd31866b JK |
434 | #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) |
435 | ||
436 | /* a summary entry for a 4KB-sized block in a segment */ | |
437 | struct f2fs_summary { | |
438 | __le32 nid; /* parent node id */ | |
439 | union { | |
440 | __u8 reserved[3]; | |
441 | struct { | |
442 | __u8 version; /* node version number */ | |
443 | __le16 ofs_in_node; /* block index in parent node */ | |
444 | } __packed; | |
445 | }; | |
446 | } __packed; | |
447 | ||
448 | /* summary block type, node or data, is stored to the summary_footer */ | |
449 | #define SUM_TYPE_NODE (1) | |
450 | #define SUM_TYPE_DATA (0) | |
451 | ||
452 | struct summary_footer { | |
453 | unsigned char entry_type; /* SUM_TYPE_XXX */ | |
479c8bc4 | 454 | __le32 check_sum; /* summary checksum */ |
dd31866b JK |
455 | } __packed; |
456 | ||
25ca923b | 457 | #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\ |
dd31866b JK |
458 | SUM_ENTRY_SIZE) |
459 | #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ | |
460 | sizeof(struct nat_journal_entry)) | |
461 | #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ | |
462 | sizeof(struct nat_journal_entry)) | |
463 | #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\ | |
464 | sizeof(struct sit_journal_entry)) | |
465 | #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\ | |
466 | sizeof(struct sit_journal_entry)) | |
8f1dbbbb SL |
467 | |
468 | /* Reserved area should make size of f2fs_extra_info equals to | |
469 | * that of nat_journal and sit_journal. | |
470 | */ | |
471 | #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8) | |
472 | ||
dd31866b JK |
473 | /* |
474 | * frequently updated NAT/SIT entries can be stored in the spare area in | |
475 | * summary blocks | |
476 | */ | |
477 | enum { | |
478 | NAT_JOURNAL = 0, | |
479 | SIT_JOURNAL | |
480 | }; | |
481 | ||
482 | struct nat_journal_entry { | |
483 | __le32 nid; | |
484 | struct f2fs_nat_entry ne; | |
485 | } __packed; | |
486 | ||
487 | struct nat_journal { | |
488 | struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES]; | |
489 | __u8 reserved[NAT_JOURNAL_RESERVED]; | |
490 | } __packed; | |
491 | ||
492 | struct sit_journal_entry { | |
493 | __le32 segno; | |
494 | struct f2fs_sit_entry se; | |
495 | } __packed; | |
496 | ||
497 | struct sit_journal { | |
498 | struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES]; | |
499 | __u8 reserved[SIT_JOURNAL_RESERVED]; | |
500 | } __packed; | |
501 | ||
8f1dbbbb SL |
502 | struct f2fs_extra_info { |
503 | __le64 kbytes_written; | |
504 | __u8 reserved[EXTRA_INFO_RESERVED]; | |
505 | } __packed; | |
506 | ||
dfc08a12 | 507 | struct f2fs_journal { |
dd31866b JK |
508 | union { |
509 | __le16 n_nats; | |
510 | __le16 n_sits; | |
511 | }; | |
8f1dbbbb | 512 | /* spare area is used by NAT or SIT journals or extra info */ |
dd31866b JK |
513 | union { |
514 | struct nat_journal nat_j; | |
515 | struct sit_journal sit_j; | |
8f1dbbbb | 516 | struct f2fs_extra_info info; |
dd31866b | 517 | }; |
dfc08a12 CY |
518 | } __packed; |
519 | ||
520 | /* 4KB-sized summary block structure */ | |
521 | struct f2fs_summary_block { | |
522 | struct f2fs_summary entries[ENTRIES_IN_SUM]; | |
523 | struct f2fs_journal journal; | |
dd31866b JK |
524 | struct summary_footer footer; |
525 | } __packed; | |
526 | ||
527 | /* | |
528 | * For directory operations | |
529 | */ | |
530 | #define F2FS_DOT_HASH 0 | |
531 | #define F2FS_DDOT_HASH F2FS_DOT_HASH | |
532 | #define F2FS_MAX_HASH (~((0x3ULL) << 62)) | |
533 | #define F2FS_HASH_COL_BIT ((0x1ULL) << 63) | |
534 | ||
535 | typedef __le32 f2fs_hash_t; | |
536 | ||
537 | /* One directory entry slot covers 8bytes-long file name */ | |
5a20d339 JK |
538 | #define F2FS_SLOT_LEN 8 |
539 | #define F2FS_SLOT_LEN_BITS 3 | |
457d08ee | 540 | |
29fa6c56 | 541 | #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS) |
dd31866b | 542 | |
dd31866b JK |
543 | /* MAX level for dir lookup */ |
544 | #define MAX_DIR_HASH_DEPTH 63 | |
545 | ||
bfec07d0 | 546 | /* MAX buckets in one level of dir */ |
447286eb | 547 | #define MAX_DIR_BUCKETS BIT((MAX_DIR_HASH_DEPTH / 2) - 1) |
bfec07d0 | 548 | |
c031f6a9 | 549 | /* |
f2470371 | 550 | * space utilization of regular dentry and inline dentry (w/o extra reservation) |
500e0b28 CY |
551 | * regular dentry inline dentry (def) inline dentry (min) |
552 | * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1 | |
553 | * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1 | |
554 | * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22 | |
555 | * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16 | |
556 | * total 4096 3488 40 | |
c031f6a9 CY |
557 | * |
558 | * Note: there are more reserved space in inline dentry than in regular | |
559 | * dentry, when converting inline dentry we should handle this carefully. | |
560 | */ | |
561 | #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */ | |
dd31866b JK |
562 | #define SIZE_OF_DIR_ENTRY 11 /* by byte */ |
563 | #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ | |
564 | BITS_PER_BYTE) | |
565 | #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \ | |
5a20d339 | 566 | F2FS_SLOT_LEN) * \ |
dd31866b | 567 | NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) |
500e0b28 | 568 | #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */ |
dd31866b | 569 | |
5a20d339 | 570 | /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */ |
dd31866b JK |
571 | struct f2fs_dir_entry { |
572 | __le32 hash_code; /* hash code of file name */ | |
573 | __le32 ino; /* inode number */ | |
1ffdc380 | 574 | __le16 name_len; /* length of file name */ |
dd31866b JK |
575 | __u8 file_type; /* file type */ |
576 | } __packed; | |
577 | ||
578 | /* 4KB-sized directory entry block */ | |
579 | struct f2fs_dentry_block { | |
580 | /* validity bitmap for directory entries in each block */ | |
581 | __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; | |
582 | __u8 reserved[SIZE_OF_RESERVED]; | |
583 | struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; | |
5a20d339 | 584 | __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; |
dd31866b JK |
585 | } __packed; |
586 | ||
5c57132e CY |
587 | #define F2FS_DEF_PROJID 0 /* default project ID */ |
588 | ||
dd31866b | 589 | #endif /* _LINUX_F2FS_FS_H */ |