1 // SPDX-License-Identifier: GPL-2.0
3 * include/linux/f2fs_fs.h
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
8 #ifndef _LINUX_F2FS_FS_H
9 #define _LINUX_F2FS_FS_H
11 #include <linux/pagemap.h>
12 #include <linux/types.h>
14 #define F2FS_SUPER_OFFSET 1024 /* byte-size offset */
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 */
18 #define F2FS_BLKSIZE 4096 /* support only 4KB block */
19 #define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */
20 #define F2FS_MAX_EXTENSION 64 /* # of extension entries */
21 #define F2FS_EXTENSION_LEN 8 /* max size of extension */
22 #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
24 #define NULL_ADDR ((block_t)0) /* used as block_t addresses */
25 #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */
27 #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS)
28 #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS)
30 /* 0, 1(node nid), 2(meta nid) are reserved node id */
31 #define F2FS_RESERVED_NODE_NUM 3
33 #define F2FS_ROOT_INO(sbi) ((sbi)->root_ino_num)
34 #define F2FS_NODE_INO(sbi) ((sbi)->node_ino_num)
35 #define F2FS_META_INO(sbi) ((sbi)->meta_ino_num)
37 #define F2FS_MAX_QUOTAS 3
39 #define F2FS_ENC_UTF8_12_1 1
40 #define F2FS_ENC_STRICT_MODE_FL (1 << 0)
41 #define f2fs_has_strict_mode(sbi) \
42 (sbi->s_encoding_flags & F2FS_ENC_STRICT_MODE_FL)
44 #define F2FS_IO_SIZE(sbi) (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */
45 #define F2FS_IO_SIZE_KB(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */
46 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */
47 #define F2FS_IO_SIZE_BITS(sbi) (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */
48 #define F2FS_IO_SIZE_MASK(sbi) (F2FS_IO_SIZE(sbi) - 1)
49 #define F2FS_IO_ALIGNED(sbi) (F2FS_IO_SIZE(sbi) > 1)
51 /* This flag is used by node and meta inodes, and by recovery */
52 #define GFP_F2FS_ZERO (GFP_NOFS | __GFP_ZERO)
55 * For further optimization on multi-head logs, on-disk layout supports maximum
56 * 16 logs by default. The number, 16, is expected to cover all the cases
57 * enoughly. The implementaion currently uses no more than 6 logs.
58 * Half the logs are used for nodes, and the other half are used for data.
60 #define MAX_ACTIVE_LOGS 16
61 #define MAX_ACTIVE_NODE_LOGS 8
62 #define MAX_ACTIVE_DATA_LOGS 8
64 #define VERSION_LEN 256
65 #define MAX_VOLUME_NAME 512
66 #define MAX_PATH_LEN 64
73 __u8 path[MAX_PATH_LEN];
74 __le32 total_segments;
77 struct f2fs_super_block {
78 __le32 magic; /* Magic Number */
79 __le16 major_ver; /* Major Version */
80 __le16 minor_ver; /* Minor Version */
81 __le32 log_sectorsize; /* log2 sector size in bytes */
82 __le32 log_sectors_per_block; /* log2 # of sectors per block */
83 __le32 log_blocksize; /* log2 block size in bytes */
84 __le32 log_blocks_per_seg; /* log2 # of blocks per segment */
85 __le32 segs_per_sec; /* # of segments per section */
86 __le32 secs_per_zone; /* # of sections per zone */
87 __le32 checksum_offset; /* checksum offset inside super block */
88 __le64 block_count; /* total # of user blocks */
89 __le32 section_count; /* total # of sections */
90 __le32 segment_count; /* total # of segments */
91 __le32 segment_count_ckpt; /* # of segments for checkpoint */
92 __le32 segment_count_sit; /* # of segments for SIT */
93 __le32 segment_count_nat; /* # of segments for NAT */
94 __le32 segment_count_ssa; /* # of segments for SSA */
95 __le32 segment_count_main; /* # of segments for main area */
96 __le32 segment0_blkaddr; /* start block address of segment 0 */
97 __le32 cp_blkaddr; /* start block address of checkpoint */
98 __le32 sit_blkaddr; /* start block address of SIT */
99 __le32 nat_blkaddr; /* start block address of NAT */
100 __le32 ssa_blkaddr; /* start block address of SSA */
101 __le32 main_blkaddr; /* start block address of main area */
102 __le32 root_ino; /* root inode number */
103 __le32 node_ino; /* node inode number */
104 __le32 meta_ino; /* meta inode number */
105 __u8 uuid[16]; /* 128-bit uuid for volume */
106 __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */
107 __le32 extension_count; /* # of extensions below */
108 __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */
110 __u8 version[VERSION_LEN]; /* the kernel version */
111 __u8 init_version[VERSION_LEN]; /* the initial kernel version */
112 __le32 feature; /* defined features */
113 __u8 encryption_level; /* versioning level for encryption */
114 __u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
115 struct f2fs_device devs[MAX_DEVICES]; /* device list */
116 __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */
117 __u8 hot_ext_count; /* # of hot file extension */
118 __le16 s_encoding; /* Filename charset encoding */
119 __le16 s_encoding_flags; /* Filename charset encoding flags */
120 __u8 reserved[306]; /* valid reserved region */
121 __le32 crc; /* checksum of superblock */
127 #define CP_DISABLED_QUICK_FLAG 0x00002000
128 #define CP_DISABLED_FLAG 0x00001000
129 #define CP_QUOTA_NEED_FSCK_FLAG 0x00000800
130 #define CP_LARGE_NAT_BITMAP_FLAG 0x00000400
131 #define CP_NOCRC_RECOVERY_FLAG 0x00000200
132 #define CP_TRIMMED_FLAG 0x00000100
133 #define CP_NAT_BITS_FLAG 0x00000080
134 #define CP_CRC_RECOVERY_FLAG 0x00000040
135 #define CP_FASTBOOT_FLAG 0x00000020
136 #define CP_FSCK_FLAG 0x00000010
137 #define CP_ERROR_FLAG 0x00000008
138 #define CP_COMPACT_SUM_FLAG 0x00000004
139 #define CP_ORPHAN_PRESENT_FLAG 0x00000002
140 #define CP_UMOUNT_FLAG 0x00000001
142 #define F2FS_CP_PACKS 2 /* # of checkpoint packs */
144 struct f2fs_checkpoint {
145 __le64 checkpoint_ver; /* checkpoint block version number */
146 __le64 user_block_count; /* # of user blocks */
147 __le64 valid_block_count; /* # of valid blocks in main area */
148 __le32 rsvd_segment_count; /* # of reserved segments for gc */
149 __le32 overprov_segment_count; /* # of overprovision segments */
150 __le32 free_segment_count; /* # of free segments in main area */
152 /* information of current node segments */
153 __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
154 __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
155 /* information of current data segments */
156 __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
157 __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
158 __le32 ckpt_flags; /* Flags : umount and journal_present */
159 __le32 cp_pack_total_block_count; /* total # of one cp pack */
160 __le32 cp_pack_start_sum; /* start block number of data summary */
161 __le32 valid_node_count; /* Total number of valid nodes */
162 __le32 valid_inode_count; /* Total number of valid inodes */
163 __le32 next_free_nid; /* Next free node number */
164 __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
165 __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
166 __le32 checksum_offset; /* checksum offset inside cp block */
167 __le64 elapsed_time; /* mounted time */
168 /* allocation type of current segment */
169 unsigned char alloc_type[MAX_ACTIVE_LOGS];
171 /* SIT and NAT version bitmap */
172 unsigned char sit_nat_version_bitmap[1];
175 #define CP_CHKSUM_OFFSET 4092 /* default chksum offset in checkpoint */
176 #define CP_MIN_CHKSUM_OFFSET \
177 (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap))
180 * For orphan inode management
182 #define F2FS_ORPHANS_PER_BLOCK 1020
184 #define GET_ORPHAN_BLOCKS(n) (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \
185 F2FS_ORPHANS_PER_BLOCK)
187 struct f2fs_orphan_block {
188 __le32 ino[F2FS_ORPHANS_PER_BLOCK]; /* inode numbers */
189 __le32 reserved; /* reserved */
190 __le16 blk_addr; /* block index in current CP */
191 __le16 blk_count; /* Number of orphan inode blocks in CP */
192 __le32 entry_count; /* Total number of orphan nodes in current CP */
193 __le32 check_sum; /* CRC32 for orphan inode block */
200 __le32 fofs; /* start file offset of the extent */
201 __le32 blk; /* start block address of the extent */
202 __le32 len; /* length of the extent */
205 #define F2FS_NAME_LEN 255
206 /* 200 bytes for inline xattrs by default */
207 #define DEFAULT_INLINE_XATTR_ADDRS 50
208 #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode */
209 #define CUR_ADDRS_PER_INODE(inode) (DEF_ADDRS_PER_INODE - \
210 get_extra_isize(inode))
211 #define DEF_NIDS_PER_INODE 5 /* Node IDs in an Inode */
212 #define ADDRS_PER_INODE(inode) addrs_per_inode(inode)
213 #define DEF_ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block */
214 #define ADDRS_PER_BLOCK(inode) addrs_per_block(inode)
215 #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block */
217 #define ADDRS_PER_PAGE(page, inode) \
218 (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode))
220 #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1)
221 #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2)
222 #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3)
223 #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4)
224 #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5)
226 #define F2FS_INLINE_XATTR 0x01 /* file inline xattr flag */
227 #define F2FS_INLINE_DATA 0x02 /* file inline data flag */
228 #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */
229 #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */
230 #define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */
231 #define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */
232 #define F2FS_PIN_FILE 0x40 /* file should not be gced */
235 __le16 i_mode; /* file mode */
236 __u8 i_advise; /* file hints */
237 __u8 i_inline; /* file inline flags */
238 __le32 i_uid; /* user ID */
239 __le32 i_gid; /* group ID */
240 __le32 i_links; /* links count */
241 __le64 i_size; /* file size in bytes */
242 __le64 i_blocks; /* file size in blocks */
243 __le64 i_atime; /* access time */
244 __le64 i_ctime; /* change time */
245 __le64 i_mtime; /* modification time */
246 __le32 i_atime_nsec; /* access time in nano scale */
247 __le32 i_ctime_nsec; /* change time in nano scale */
248 __le32 i_mtime_nsec; /* modification time in nano scale */
249 __le32 i_generation; /* file version (for NFS) */
251 __le32 i_current_depth; /* only for directory depth */
252 __le16 i_gc_failures; /*
253 * # of gc failures on pinned file.
254 * only for regular files.
257 __le32 i_xattr_nid; /* nid to save xattr */
258 __le32 i_flags; /* file attributes */
259 __le32 i_pino; /* parent inode number */
260 __le32 i_namelen; /* file name length */
261 __u8 i_name[F2FS_NAME_LEN]; /* file name for SPOR */
262 __u8 i_dir_level; /* dentry_level for large dir */
264 struct f2fs_extent i_ext; /* caching a largest extent */
268 __le16 i_extra_isize; /* extra inode attribute size */
269 __le16 i_inline_xattr_size; /* inline xattr size, unit: 4 bytes */
270 __le32 i_projid; /* project id */
271 __le32 i_inode_checksum;/* inode meta checksum */
272 __le64 i_crtime; /* creation time */
273 __le32 i_crtime_nsec; /* creation time in nano scale */
274 __le32 i_extra_end[0]; /* for attribute size calculation */
276 __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */
278 __le32 i_nid[DEF_NIDS_PER_INODE]; /* direct(2), indirect(2),
279 double_indirect(1) node id */
283 __le32 addr[DEF_ADDRS_PER_BLOCK]; /* array of data block address */
286 struct indirect_node {
287 __le32 nid[NIDS_PER_BLOCK]; /* array of data block address */
297 #define OFFSET_BIT_MASK (0x07) /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
300 __le32 nid; /* node id */
301 __le32 ino; /* inode number */
302 __le32 flag; /* include cold/fsync/dentry marks and offset */
303 __le64 cp_ver; /* checkpoint version */
304 __le32 next_blkaddr; /* next node page block address */
308 /* can be one of three types: inode, direct, and indirect types */
311 struct direct_node dn;
312 struct indirect_node in;
314 struct node_footer footer;
320 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry))
322 struct f2fs_nat_entry {
323 __u8 version; /* latest version of cached nat entry */
324 __le32 ino; /* inode number */
325 __le32 block_addr; /* block address */
328 struct f2fs_nat_block {
329 struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
335 * Each segment is 2MB in size by default so that a bitmap for validity of
336 * there-in blocks should occupy 64 bytes, 512 bits.
337 * Not allow to change this.
339 #define SIT_VBLOCK_MAP_SIZE 64
340 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
343 * F2FS uses 4 bytes to represent block address. As a result, supported size of
344 * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
346 #define F2FS_MAX_SEGMENT ((16 * 1024 * 1024) / 2)
349 * Note that f2fs_sit_entry->vblocks has the following bit-field information.
350 * [15:10] : allocation type such as CURSEG_XXXX_TYPE
351 * [9:0] : valid block count
353 #define SIT_VBLOCKS_SHIFT 10
354 #define SIT_VBLOCKS_MASK ((1 << SIT_VBLOCKS_SHIFT) - 1)
355 #define GET_SIT_VBLOCKS(raw_sit) \
356 (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
357 #define GET_SIT_TYPE(raw_sit) \
358 ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK) \
359 >> SIT_VBLOCKS_SHIFT)
361 struct f2fs_sit_entry {
362 __le16 vblocks; /* reference above */
363 __u8 valid_map[SIT_VBLOCK_MAP_SIZE]; /* bitmap for valid blocks */
364 __le64 mtime; /* segment age for cleaning */
367 struct f2fs_sit_block {
368 struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
372 * For segment summary
374 * One summary block contains exactly 512 summary entries, which represents
375 * exactly 2MB segment by default. Not allow to change the basic units.
377 * NOTE: For initializing fields, you must use set_summary
379 * - If data page, nid represents dnode's nid
380 * - If node page, nid represents the node page's nid.
382 * The ofs_in_node is used by only data page. It represents offset
383 * from node's page's beginning to get a data block address.
384 * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
386 #define ENTRIES_IN_SUM 512
387 #define SUMMARY_SIZE (7) /* sizeof(struct summary) */
388 #define SUM_FOOTER_SIZE (5) /* sizeof(struct summary_footer) */
389 #define SUM_ENTRY_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM)
391 /* a summary entry for a 4KB-sized block in a segment */
392 struct f2fs_summary {
393 __le32 nid; /* parent node id */
397 __u8 version; /* node version number */
398 __le16 ofs_in_node; /* block index in parent node */
403 /* summary block type, node or data, is stored to the summary_footer */
404 #define SUM_TYPE_NODE (1)
405 #define SUM_TYPE_DATA (0)
407 struct summary_footer {
408 unsigned char entry_type; /* SUM_TYPE_XXX */
409 __le32 check_sum; /* summary checksum */
412 #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
414 #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
415 sizeof(struct nat_journal_entry))
416 #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
417 sizeof(struct nat_journal_entry))
418 #define SIT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) /\
419 sizeof(struct sit_journal_entry))
420 #define SIT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) %\
421 sizeof(struct sit_journal_entry))
423 /* Reserved area should make size of f2fs_extra_info equals to
424 * that of nat_journal and sit_journal.
426 #define EXTRA_INFO_RESERVED (SUM_JOURNAL_SIZE - 2 - 8)
429 * frequently updated NAT/SIT entries can be stored in the spare area in
437 struct nat_journal_entry {
439 struct f2fs_nat_entry ne;
443 struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
444 __u8 reserved[NAT_JOURNAL_RESERVED];
447 struct sit_journal_entry {
449 struct f2fs_sit_entry se;
453 struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
454 __u8 reserved[SIT_JOURNAL_RESERVED];
457 struct f2fs_extra_info {
458 __le64 kbytes_written;
459 __u8 reserved[EXTRA_INFO_RESERVED];
462 struct f2fs_journal {
467 /* spare area is used by NAT or SIT journals or extra info */
469 struct nat_journal nat_j;
470 struct sit_journal sit_j;
471 struct f2fs_extra_info info;
475 /* 4KB-sized summary block structure */
476 struct f2fs_summary_block {
477 struct f2fs_summary entries[ENTRIES_IN_SUM];
478 struct f2fs_journal journal;
479 struct summary_footer footer;
483 * For directory operations
485 #define F2FS_DOT_HASH 0
486 #define F2FS_DDOT_HASH F2FS_DOT_HASH
487 #define F2FS_MAX_HASH (~((0x3ULL) << 62))
488 #define F2FS_HASH_COL_BIT ((0x1ULL) << 63)
490 typedef __le32 f2fs_hash_t;
492 /* One directory entry slot covers 8bytes-long file name */
493 #define F2FS_SLOT_LEN 8
494 #define F2FS_SLOT_LEN_BITS 3
496 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
498 /* MAX level for dir lookup */
499 #define MAX_DIR_HASH_DEPTH 63
501 /* MAX buckets in one level of dir */
502 #define MAX_DIR_BUCKETS (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
505 * space utilization of regular dentry and inline dentry (w/o extra reservation)
506 * regular dentry inline dentry (def) inline dentry (min)
507 * bitmap 1 * 27 = 27 1 * 23 = 23 1 * 1 = 1
508 * reserved 1 * 3 = 3 1 * 7 = 7 1 * 1 = 1
509 * dentry 11 * 214 = 2354 11 * 182 = 2002 11 * 2 = 22
510 * filename 8 * 214 = 1712 8 * 182 = 1456 8 * 2 = 16
513 * Note: there are more reserved space in inline dentry than in regular
514 * dentry, when converting inline dentry we should handle this carefully.
516 #define NR_DENTRY_IN_BLOCK 214 /* the number of dentry in a block */
517 #define SIZE_OF_DIR_ENTRY 11 /* by byte */
518 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
520 #define SIZE_OF_RESERVED (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
522 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
523 #define MIN_INLINE_DENTRY_SIZE 40 /* just include '.' and '..' entries */
525 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
526 struct f2fs_dir_entry {
527 __le32 hash_code; /* hash code of file name */
528 __le32 ino; /* inode number */
529 __le16 name_len; /* length of file name */
530 __u8 file_type; /* file type */
533 /* 4KB-sized directory entry block */
534 struct f2fs_dentry_block {
535 /* validity bitmap for directory entries in each block */
536 __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
537 __u8 reserved[SIZE_OF_RESERVED];
538 struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
539 __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
542 /* file types used in inode_info->flags */
557 #define F2FS_DEF_PROJID 0 /* default project ID */
559 #endif /* _LINUX_F2FS_FS_H */