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TOMOYO Linux Cross Reference
Linux/include/linux/f2fs_fs.h

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  1 /**
  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_MIN_LOG_SECTOR_SIZE        9       /* 9 bits for 512 bytes */
 19 #define F2FS_MAX_LOG_SECTOR_SIZE        12      /* 12 bits for 4096 bytes */
 20 #define F2FS_LOG_SECTORS_PER_BLOCK      3       /* log number for sector/blk */
 21 #define F2FS_BLKSIZE                    4096    /* support only 4KB block */
 22 #define F2FS_BLKSIZE_BITS               12      /* bits for F2FS_BLKSIZE */
 23 #define F2FS_MAX_EXTENSION              64      /* # of extension entries */
 24 #define F2FS_BLK_ALIGN(x)       (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
 25 
 26 #define NULL_ADDR               ((block_t)0)    /* used as block_t addresses */
 27 #define NEW_ADDR                ((block_t)-1)   /* used as block_t addresses */
 28 
 29 #define F2FS_BYTES_TO_BLK(bytes)        ((bytes) >> F2FS_BLKSIZE_BITS)
 30 #define F2FS_BLK_TO_BYTES(blk)          ((blk) << F2FS_BLKSIZE_BITS)
 31 
 32 /* 0, 1(node nid), 2(meta nid) are reserved node id */
 33 #define F2FS_RESERVED_NODE_NUM          3
 34 
 35 #define F2FS_ROOT_INO(sbi)      ((sbi)->root_ino_num)
 36 #define F2FS_NODE_INO(sbi)      ((sbi)->node_ino_num)
 37 #define F2FS_META_INO(sbi)      ((sbi)->meta_ino_num)
 38 
 39 #define F2FS_MAX_QUOTAS         3
 40 
 41 #define F2FS_IO_SIZE(sbi)       (1 << (sbi)->write_io_size_bits) /* Blocks */
 42 #define F2FS_IO_SIZE_KB(sbi)    (1 << ((sbi)->write_io_size_bits + 2)) /* KB */
 43 #define F2FS_IO_SIZE_BYTES(sbi) (1 << ((sbi)->write_io_size_bits + 12)) /* B */
 44 #define F2FS_IO_SIZE_BITS(sbi)  ((sbi)->write_io_size_bits) /* power of 2 */
 45 #define F2FS_IO_SIZE_MASK(sbi)  (F2FS_IO_SIZE(sbi) - 1)
 46 
 47 /* This flag is used by node and meta inodes, and by recovery */
 48 #define GFP_F2FS_ZERO           (GFP_NOFS | __GFP_ZERO)
 49 #define GFP_F2FS_HIGH_ZERO      (GFP_NOFS | __GFP_ZERO | __GFP_HIGHMEM)
 50 
 51 /*
 52  * For further optimization on multi-head logs, on-disk layout supports maximum
 53  * 16 logs by default. The number, 16, is expected to cover all the cases
 54  * enoughly. The implementaion currently uses no more than 6 logs.
 55  * Half the logs are used for nodes, and the other half are used for data.
 56  */
 57 #define MAX_ACTIVE_LOGS 16
 58 #define MAX_ACTIVE_NODE_LOGS    8
 59 #define MAX_ACTIVE_DATA_LOGS    8
 60 
 61 #define VERSION_LEN     256
 62 #define MAX_VOLUME_NAME         512
 63 #define MAX_PATH_LEN            64
 64 #define MAX_DEVICES             8
 65 
 66 /*
 67  * For superblock
 68  */
 69 struct f2fs_device {
 70         __u8 path[MAX_PATH_LEN];
 71         __le32 total_segments;
 72 } __packed;
 73 
 74 struct f2fs_super_block {
 75         __le32 magic;                   /* Magic Number */
 76         __le16 major_ver;               /* Major Version */
 77         __le16 minor_ver;               /* Minor Version */
 78         __le32 log_sectorsize;          /* log2 sector size in bytes */
 79         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
 80         __le32 log_blocksize;           /* log2 block size in bytes */
 81         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
 82         __le32 segs_per_sec;            /* # of segments per section */
 83         __le32 secs_per_zone;           /* # of sections per zone */
 84         __le32 checksum_offset;         /* checksum offset inside super block */
 85         __le64 block_count;             /* total # of user blocks */
 86         __le32 section_count;           /* total # of sections */
 87         __le32 segment_count;           /* total # of segments */
 88         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
 89         __le32 segment_count_sit;       /* # of segments for SIT */
 90         __le32 segment_count_nat;       /* # of segments for NAT */
 91         __le32 segment_count_ssa;       /* # of segments for SSA */
 92         __le32 segment_count_main;      /* # of segments for main area */
 93         __le32 segment0_blkaddr;        /* start block address of segment 0 */
 94         __le32 cp_blkaddr;              /* start block address of checkpoint */
 95         __le32 sit_blkaddr;             /* start block address of SIT */
 96         __le32 nat_blkaddr;             /* start block address of NAT */
 97         __le32 ssa_blkaddr;             /* start block address of SSA */
 98         __le32 main_blkaddr;            /* start block address of main area */
 99         __le32 root_ino;                /* root inode number */
100         __le32 node_ino;                /* node inode number */
101         __le32 meta_ino;                /* meta inode number */
102         __u8 uuid[16];                  /* 128-bit uuid for volume */
103         __le16 volume_name[MAX_VOLUME_NAME];    /* volume name */
104         __le32 extension_count;         /* # of extensions below */
105         __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
106         __le32 cp_payload;
107         __u8 version[VERSION_LEN];      /* the kernel version */
108         __u8 init_version[VERSION_LEN]; /* the initial kernel version */
109         __le32 feature;                 /* defined features */
110         __u8 encryption_level;          /* versioning level for encryption */
111         __u8 encrypt_pw_salt[16];       /* Salt used for string2key algorithm */
112         struct f2fs_device devs[MAX_DEVICES];   /* device list */
113         __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */
114         __u8 reserved[315];             /* valid reserved region */
115 } __packed;
116 
117 /*
118  * For checkpoint
119  */
120 #define CP_TRIMMED_FLAG         0x00000100
121 #define CP_NAT_BITS_FLAG        0x00000080
122 #define CP_CRC_RECOVERY_FLAG    0x00000040
123 #define CP_FASTBOOT_FLAG        0x00000020
124 #define CP_FSCK_FLAG            0x00000010
125 #define CP_ERROR_FLAG           0x00000008
126 #define CP_COMPACT_SUM_FLAG     0x00000004
127 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
128 #define CP_UMOUNT_FLAG          0x00000001
129 
130 #define F2FS_CP_PACKS           2       /* # of checkpoint packs */
131 
132 struct f2fs_checkpoint {
133         __le64 checkpoint_ver;          /* checkpoint block version number */
134         __le64 user_block_count;        /* # of user blocks */
135         __le64 valid_block_count;       /* # of valid blocks in main area */
136         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
137         __le32 overprov_segment_count;  /* # of overprovision segments */
138         __le32 free_segment_count;      /* # of free segments in main area */
139 
140         /* information of current node segments */
141         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
142         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
143         /* information of current data segments */
144         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
145         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
146         __le32 ckpt_flags;              /* Flags : umount and journal_present */
147         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
148         __le32 cp_pack_start_sum;       /* start block number of data summary */
149         __le32 valid_node_count;        /* Total number of valid nodes */
150         __le32 valid_inode_count;       /* Total number of valid inodes */
151         __le32 next_free_nid;           /* Next free node number */
152         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
153         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
154         __le32 checksum_offset;         /* checksum offset inside cp block */
155         __le64 elapsed_time;            /* mounted time */
156         /* allocation type of current segment */
157         unsigned char alloc_type[MAX_ACTIVE_LOGS];
158 
159         /* SIT and NAT version bitmap */
160         unsigned char sit_nat_version_bitmap[1];
161 } __packed;
162 
163 /*
164  * For orphan inode management
165  */
166 #define F2FS_ORPHANS_PER_BLOCK  1020
167 
168 #define GET_ORPHAN_BLOCKS(n)    (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \
169                                         F2FS_ORPHANS_PER_BLOCK)
170 
171 struct f2fs_orphan_block {
172         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
173         __le32 reserved;        /* reserved */
174         __le16 blk_addr;        /* block index in current CP */
175         __le16 blk_count;       /* Number of orphan inode blocks in CP */
176         __le32 entry_count;     /* Total number of orphan nodes in current CP */
177         __le32 check_sum;       /* CRC32 for orphan inode block */
178 } __packed;
179 
180 /*
181  * For NODE structure
182  */
183 struct f2fs_extent {
184         __le32 fofs;            /* start file offset of the extent */
185         __le32 blk;             /* start block address of the extent */
186         __le32 len;             /* lengh of the extent */
187 } __packed;
188 
189 #define F2FS_NAME_LEN           255
190 /* 200 bytes for inline xattrs by default */
191 #define DEFAULT_INLINE_XATTR_ADDRS      50
192 #define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
193 #define CUR_ADDRS_PER_INODE(inode)      (DEF_ADDRS_PER_INODE - \
194                                         get_extra_isize(inode))
195 #define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
196 #define ADDRS_PER_INODE(inode)  addrs_per_inode(inode)
197 #define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
198 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
199 
200 #define ADDRS_PER_PAGE(page, inode)     \
201         (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK)
202 
203 #define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
204 #define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
205 #define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
206 #define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
207 #define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
208 
209 #define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
210 #define F2FS_INLINE_DATA        0x02    /* file inline data flag */
211 #define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
212 #define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
213 #define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
214 #define F2FS_EXTRA_ATTR         0x20    /* file having extra attribute */
215 
216 struct f2fs_inode {
217         __le16 i_mode;                  /* file mode */
218         __u8 i_advise;                  /* file hints */
219         __u8 i_inline;                  /* file inline flags */
220         __le32 i_uid;                   /* user ID */
221         __le32 i_gid;                   /* group ID */
222         __le32 i_links;                 /* links count */
223         __le64 i_size;                  /* file size in bytes */
224         __le64 i_blocks;                /* file size in blocks */
225         __le64 i_atime;                 /* access time */
226         __le64 i_ctime;                 /* change time */
227         __le64 i_mtime;                 /* modification time */
228         __le32 i_atime_nsec;            /* access time in nano scale */
229         __le32 i_ctime_nsec;            /* change time in nano scale */
230         __le32 i_mtime_nsec;            /* modification time in nano scale */
231         __le32 i_generation;            /* file version (for NFS) */
232         __le32 i_current_depth;         /* only for directory depth */
233         __le32 i_xattr_nid;             /* nid to save xattr */
234         __le32 i_flags;                 /* file attributes */
235         __le32 i_pino;                  /* parent inode number */
236         __le32 i_namelen;               /* file name length */
237         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
238         __u8 i_dir_level;               /* dentry_level for large dir */
239 
240         struct f2fs_extent i_ext;       /* caching a largest extent */
241 
242         union {
243                 struct {
244                         __le16 i_extra_isize;   /* extra inode attribute size */
245                         __le16 i_inline_xattr_size;     /* inline xattr size, unit: 4 bytes */
246                         __le32 i_projid;        /* project id */
247                         __le32 i_inode_checksum;/* inode meta checksum */
248                         __le32 i_extra_end[0];  /* for attribute size calculation */
249                 };
250                 __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
251         };
252         __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
253                                                 double_indirect(1) node id */
254 } __packed;
255 
256 struct direct_node {
257         __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
258 } __packed;
259 
260 struct indirect_node {
261         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
262 } __packed;
263 
264 enum {
265         COLD_BIT_SHIFT = 0,
266         FSYNC_BIT_SHIFT,
267         DENT_BIT_SHIFT,
268         OFFSET_BIT_SHIFT
269 };
270 
271 #define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
272 
273 struct node_footer {
274         __le32 nid;             /* node id */
275         __le32 ino;             /* inode nunmber */
276         __le32 flag;            /* include cold/fsync/dentry marks and offset */
277         __le64 cp_ver;          /* checkpoint version */
278         __le32 next_blkaddr;    /* next node page block address */
279 } __packed;
280 
281 struct f2fs_node {
282         /* can be one of three types: inode, direct, and indirect types */
283         union {
284                 struct f2fs_inode i;
285                 struct direct_node dn;
286                 struct indirect_node in;
287         };
288         struct node_footer footer;
289 } __packed;
290 
291 /*
292  * For NAT entries
293  */
294 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry))
295 #define NAT_ENTRY_BITMAP_SIZE   ((NAT_ENTRY_PER_BLOCK + 7) / 8)
296 
297 struct f2fs_nat_entry {
298         __u8 version;           /* latest version of cached nat entry */
299         __le32 ino;             /* inode number */
300         __le32 block_addr;      /* block address */
301 } __packed;
302 
303 struct f2fs_nat_block {
304         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
305 } __packed;
306 
307 /*
308  * For SIT entries
309  *
310  * Each segment is 2MB in size by default so that a bitmap for validity of
311  * there-in blocks should occupy 64 bytes, 512 bits.
312  * Not allow to change this.
313  */
314 #define SIT_VBLOCK_MAP_SIZE 64
315 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
316 
317 /*
318  * F2FS uses 4 bytes to represent block address. As a result, supported size of
319  * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
320  */
321 #define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)
322 
323 /*
324  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
325  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
326  * [9:0] : valid block count
327  */
328 #define SIT_VBLOCKS_SHIFT       10
329 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
330 #define GET_SIT_VBLOCKS(raw_sit)                                \
331         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
332 #define GET_SIT_TYPE(raw_sit)                                   \
333         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
334          >> SIT_VBLOCKS_SHIFT)
335 
336 struct f2fs_sit_entry {
337         __le16 vblocks;                         /* reference above */
338         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
339         __le64 mtime;                           /* segment age for cleaning */
340 } __packed;
341 
342 struct f2fs_sit_block {
343         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
344 } __packed;
345 
346 /*
347  * For segment summary
348  *
349  * One summary block contains exactly 512 summary entries, which represents
350  * exactly 2MB segment by default. Not allow to change the basic units.
351  *
352  * NOTE: For initializing fields, you must use set_summary
353  *
354  * - If data page, nid represents dnode's nid
355  * - If node page, nid represents the node page's nid.
356  *
357  * The ofs_in_node is used by only data page. It represents offset
358  * from node's page's beginning to get a data block address.
359  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
360  */
361 #define ENTRIES_IN_SUM          512
362 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
363 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
364 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
365 
366 /* a summary entry for a 4KB-sized block in a segment */
367 struct f2fs_summary {
368         __le32 nid;             /* parent node id */
369         union {
370                 __u8 reserved[3];
371                 struct {
372                         __u8 version;           /* node version number */
373                         __le16 ofs_in_node;     /* block index in parent node */
374                 } __packed;
375         };
376 } __packed;
377 
378 /* summary block type, node or data, is stored to the summary_footer */
379 #define SUM_TYPE_NODE           (1)
380 #define SUM_TYPE_DATA           (0)
381 
382 struct summary_footer {
383         unsigned char entry_type;       /* SUM_TYPE_XXX */
384         __le32 check_sum;               /* summary checksum */
385 } __packed;
386 
387 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
388                                 SUM_ENTRY_SIZE)
389 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
390                                 sizeof(struct nat_journal_entry))
391 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
392                                 sizeof(struct nat_journal_entry))
393 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
394                                 sizeof(struct sit_journal_entry))
395 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
396                                 sizeof(struct sit_journal_entry))
397 
398 /* Reserved area should make size of f2fs_extra_info equals to
399  * that of nat_journal and sit_journal.
400  */
401 #define EXTRA_INFO_RESERVED     (SUM_JOURNAL_SIZE - 2 - 8)
402 
403 /*
404  * frequently updated NAT/SIT entries can be stored in the spare area in
405  * summary blocks
406  */
407 enum {
408         NAT_JOURNAL = 0,
409         SIT_JOURNAL
410 };
411 
412 struct nat_journal_entry {
413         __le32 nid;
414         struct f2fs_nat_entry ne;
415 } __packed;
416 
417 struct nat_journal {
418         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
419         __u8 reserved[NAT_JOURNAL_RESERVED];
420 } __packed;
421 
422 struct sit_journal_entry {
423         __le32 segno;
424         struct f2fs_sit_entry se;
425 } __packed;
426 
427 struct sit_journal {
428         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
429         __u8 reserved[SIT_JOURNAL_RESERVED];
430 } __packed;
431 
432 struct f2fs_extra_info {
433         __le64 kbytes_written;
434         __u8 reserved[EXTRA_INFO_RESERVED];
435 } __packed;
436 
437 struct f2fs_journal {
438         union {
439                 __le16 n_nats;
440                 __le16 n_sits;
441         };
442         /* spare area is used by NAT or SIT journals or extra info */
443         union {
444                 struct nat_journal nat_j;
445                 struct sit_journal sit_j;
446                 struct f2fs_extra_info info;
447         };
448 } __packed;
449 
450 /* 4KB-sized summary block structure */
451 struct f2fs_summary_block {
452         struct f2fs_summary entries[ENTRIES_IN_SUM];
453         struct f2fs_journal journal;
454         struct summary_footer footer;
455 } __packed;
456 
457 /*
458  * For directory operations
459  */
460 #define F2FS_DOT_HASH           0
461 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
462 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
463 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
464 
465 typedef __le32  f2fs_hash_t;
466 
467 /* One directory entry slot covers 8bytes-long file name */
468 #define F2FS_SLOT_LEN           8
469 #define F2FS_SLOT_LEN_BITS      3
470 
471 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
472 
473 /* MAX level for dir lookup */
474 #define MAX_DIR_HASH_DEPTH      63
475 
476 /* MAX buckets in one level of dir */
477 #define MAX_DIR_BUCKETS         (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
478 
479 /*
480  * space utilization of regular dentry and inline dentry (w/o extra reservation)
481  *              regular dentry                  inline dentry
482  * bitmap       1 * 27 = 27                     1 * 23 = 23
483  * reserved     1 * 3 = 3                       1 * 7 = 7
484  * dentry       11 * 214 = 2354                 11 * 182 = 2002
485  * filename     8 * 214 = 1712                  8 * 182 = 1456
486  * total        4096                            3488
487  *
488  * Note: there are more reserved space in inline dentry than in regular
489  * dentry, when converting inline dentry we should handle this carefully.
490  */
491 #define NR_DENTRY_IN_BLOCK      214     /* the number of dentry in a block */
492 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
493 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
494                                         BITS_PER_BYTE)
495 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
496                                 F2FS_SLOT_LEN) * \
497                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
498 
499 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
500 struct f2fs_dir_entry {
501         __le32 hash_code;       /* hash code of file name */
502         __le32 ino;             /* inode number */
503         __le16 name_len;        /* lengh of file name */
504         __u8 file_type;         /* file type */
505 } __packed;
506 
507 /* 4KB-sized directory entry block */
508 struct f2fs_dentry_block {
509         /* validity bitmap for directory entries in each block */
510         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
511         __u8 reserved[SIZE_OF_RESERVED];
512         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
513         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
514 } __packed;
515 
516 /* file types used in inode_info->flags */
517 enum {
518         F2FS_FT_UNKNOWN,
519         F2FS_FT_REG_FILE,
520         F2FS_FT_DIR,
521         F2FS_FT_CHRDEV,
522         F2FS_FT_BLKDEV,
523         F2FS_FT_FIFO,
524         F2FS_FT_SOCK,
525         F2FS_FT_SYMLINK,
526         F2FS_FT_MAX
527 };
528 
529 #define S_SHIFT 12
530 
531 #define F2FS_DEF_PROJID         0       /* default project ID */
532 
533 #endif  /* _LINUX_F2FS_FS_H */
534 

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