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Linux/include/linux/f2fs_fs.h

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /**
  3  * include/linux/f2fs_fs.h
  4  *
  5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  6  *             http://www.samsung.com/
  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 */
 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)
 23 
 24 #define NULL_ADDR               ((block_t)0)    /* used as block_t addresses */
 25 #define NEW_ADDR                ((block_t)-1)   /* used as block_t addresses */
 26 
 27 #define F2FS_BYTES_TO_BLK(bytes)        ((bytes) >> F2FS_BLKSIZE_BITS)
 28 #define F2FS_BLK_TO_BYTES(blk)          ((blk) << F2FS_BLKSIZE_BITS)
 29 
 30 /* 0, 1(node nid), 2(meta nid) are reserved node id */
 31 #define F2FS_RESERVED_NODE_NUM          3
 32 
 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)
 36 
 37 #define F2FS_MAX_QUOTAS         3
 38 
 39 #define F2FS_IO_SIZE(sbi)       (1 << F2FS_OPTION(sbi).write_io_size_bits) /* Blocks */
 40 #define F2FS_IO_SIZE_KB(sbi)    (1 << (F2FS_OPTION(sbi).write_io_size_bits + 2)) /* KB */
 41 #define F2FS_IO_SIZE_BYTES(sbi) (1 << (F2FS_OPTION(sbi).write_io_size_bits + 12)) /* B */
 42 #define F2FS_IO_SIZE_BITS(sbi)  (F2FS_OPTION(sbi).write_io_size_bits) /* power of 2 */
 43 #define F2FS_IO_SIZE_MASK(sbi)  (F2FS_IO_SIZE(sbi) - 1)
 44 
 45 /* This flag is used by node and meta inodes, and by recovery */
 46 #define GFP_F2FS_ZERO           (GFP_NOFS | __GFP_ZERO)
 47 
 48 /*
 49  * For further optimization on multi-head logs, on-disk layout supports maximum
 50  * 16 logs by default. The number, 16, is expected to cover all the cases
 51  * enoughly. The implementaion currently uses no more than 6 logs.
 52  * Half the logs are used for nodes, and the other half are used for data.
 53  */
 54 #define MAX_ACTIVE_LOGS 16
 55 #define MAX_ACTIVE_NODE_LOGS    8
 56 #define MAX_ACTIVE_DATA_LOGS    8
 57 
 58 #define VERSION_LEN     256
 59 #define MAX_VOLUME_NAME         512
 60 #define MAX_PATH_LEN            64
 61 #define MAX_DEVICES             8
 62 
 63 /*
 64  * For superblock
 65  */
 66 struct f2fs_device {
 67         __u8 path[MAX_PATH_LEN];
 68         __le32 total_segments;
 69 } __packed;
 70 
 71 struct f2fs_super_block {
 72         __le32 magic;                   /* Magic Number */
 73         __le16 major_ver;               /* Major Version */
 74         __le16 minor_ver;               /* Minor Version */
 75         __le32 log_sectorsize;          /* log2 sector size in bytes */
 76         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
 77         __le32 log_blocksize;           /* log2 block size in bytes */
 78         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
 79         __le32 segs_per_sec;            /* # of segments per section */
 80         __le32 secs_per_zone;           /* # of sections per zone */
 81         __le32 checksum_offset;         /* checksum offset inside super block */
 82         __le64 block_count;             /* total # of user blocks */
 83         __le32 section_count;           /* total # of sections */
 84         __le32 segment_count;           /* total # of segments */
 85         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
 86         __le32 segment_count_sit;       /* # of segments for SIT */
 87         __le32 segment_count_nat;       /* # of segments for NAT */
 88         __le32 segment_count_ssa;       /* # of segments for SSA */
 89         __le32 segment_count_main;      /* # of segments for main area */
 90         __le32 segment0_blkaddr;        /* start block address of segment 0 */
 91         __le32 cp_blkaddr;              /* start block address of checkpoint */
 92         __le32 sit_blkaddr;             /* start block address of SIT */
 93         __le32 nat_blkaddr;             /* start block address of NAT */
 94         __le32 ssa_blkaddr;             /* start block address of SSA */
 95         __le32 main_blkaddr;            /* start block address of main area */
 96         __le32 root_ino;                /* root inode number */
 97         __le32 node_ino;                /* node inode number */
 98         __le32 meta_ino;                /* meta inode number */
 99         __u8 uuid[16];                  /* 128-bit uuid for volume */
100         __le16 volume_name[MAX_VOLUME_NAME];    /* volume name */
101         __le32 extension_count;         /* # of extensions below */
102         __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */
103         __le32 cp_payload;
104         __u8 version[VERSION_LEN];      /* the kernel version */
105         __u8 init_version[VERSION_LEN]; /* the initial kernel version */
106         __le32 feature;                 /* defined features */
107         __u8 encryption_level;          /* versioning level for encryption */
108         __u8 encrypt_pw_salt[16];       /* Salt used for string2key algorithm */
109         struct f2fs_device devs[MAX_DEVICES];   /* device list */
110         __le32 qf_ino[F2FS_MAX_QUOTAS]; /* quota inode numbers */
111         __u8 hot_ext_count;             /* # of hot file extension */
112         __u8 reserved[310];             /* valid reserved region */
113         __le32 crc;                     /* checksum of superblock */
114 } __packed;
115 
116 /*
117  * For checkpoint
118  */
119 #define CP_DISABLED_QUICK_FLAG          0x00002000
120 #define CP_DISABLED_FLAG                0x00001000
121 #define CP_QUOTA_NEED_FSCK_FLAG         0x00000800
122 #define CP_LARGE_NAT_BITMAP_FLAG        0x00000400
123 #define CP_NOCRC_RECOVERY_FLAG  0x00000200
124 #define CP_TRIMMED_FLAG         0x00000100
125 #define CP_NAT_BITS_FLAG        0x00000080
126 #define CP_CRC_RECOVERY_FLAG    0x00000040
127 #define CP_FASTBOOT_FLAG        0x00000020
128 #define CP_FSCK_FLAG            0x00000010
129 #define CP_ERROR_FLAG           0x00000008
130 #define CP_COMPACT_SUM_FLAG     0x00000004
131 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
132 #define CP_UMOUNT_FLAG          0x00000001
133 
134 #define F2FS_CP_PACKS           2       /* # of checkpoint packs */
135 
136 struct f2fs_checkpoint {
137         __le64 checkpoint_ver;          /* checkpoint block version number */
138         __le64 user_block_count;        /* # of user blocks */
139         __le64 valid_block_count;       /* # of valid blocks in main area */
140         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
141         __le32 overprov_segment_count;  /* # of overprovision segments */
142         __le32 free_segment_count;      /* # of free segments in main area */
143 
144         /* information of current node segments */
145         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
146         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
147         /* information of current data segments */
148         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
149         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
150         __le32 ckpt_flags;              /* Flags : umount and journal_present */
151         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
152         __le32 cp_pack_start_sum;       /* start block number of data summary */
153         __le32 valid_node_count;        /* Total number of valid nodes */
154         __le32 valid_inode_count;       /* Total number of valid inodes */
155         __le32 next_free_nid;           /* Next free node number */
156         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
157         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
158         __le32 checksum_offset;         /* checksum offset inside cp block */
159         __le64 elapsed_time;            /* mounted time */
160         /* allocation type of current segment */
161         unsigned char alloc_type[MAX_ACTIVE_LOGS];
162 
163         /* SIT and NAT version bitmap */
164         unsigned char sit_nat_version_bitmap[1];
165 } __packed;
166 
167 #define CP_CHKSUM_OFFSET        4092    /* default chksum offset in checkpoint */
168 #define CP_MIN_CHKSUM_OFFSET                                            \
169         (offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap))
170 
171 /*
172  * For orphan inode management
173  */
174 #define F2FS_ORPHANS_PER_BLOCK  1020
175 
176 #define GET_ORPHAN_BLOCKS(n)    (((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \
177                                         F2FS_ORPHANS_PER_BLOCK)
178 
179 struct f2fs_orphan_block {
180         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
181         __le32 reserved;        /* reserved */
182         __le16 blk_addr;        /* block index in current CP */
183         __le16 blk_count;       /* Number of orphan inode blocks in CP */
184         __le32 entry_count;     /* Total number of orphan nodes in current CP */
185         __le32 check_sum;       /* CRC32 for orphan inode block */
186 } __packed;
187 
188 /*
189  * For NODE structure
190  */
191 struct f2fs_extent {
192         __le32 fofs;            /* start file offset of the extent */
193         __le32 blk;             /* start block address of the extent */
194         __le32 len;             /* length of the extent */
195 } __packed;
196 
197 #define F2FS_NAME_LEN           255
198 /* 200 bytes for inline xattrs by default */
199 #define DEFAULT_INLINE_XATTR_ADDRS      50
200 #define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
201 #define CUR_ADDRS_PER_INODE(inode)      (DEF_ADDRS_PER_INODE - \
202                                         get_extra_isize(inode))
203 #define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
204 #define ADDRS_PER_INODE(inode)  addrs_per_inode(inode)
205 #define DEF_ADDRS_PER_BLOCK     1018    /* Address Pointers in a Direct Block */
206 #define ADDRS_PER_BLOCK(inode)  addrs_per_block(inode)
207 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
208 
209 #define ADDRS_PER_PAGE(page, inode)     \
210         (IS_INODE(page) ? ADDRS_PER_INODE(inode) : ADDRS_PER_BLOCK(inode))
211 
212 #define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
213 #define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
214 #define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
215 #define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
216 #define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
217 
218 #define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
219 #define F2FS_INLINE_DATA        0x02    /* file inline data flag */
220 #define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
221 #define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
222 #define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
223 #define F2FS_EXTRA_ATTR         0x20    /* file having extra attribute */
224 #define F2FS_PIN_FILE           0x40    /* file should not be gced */
225 
226 struct f2fs_inode {
227         __le16 i_mode;                  /* file mode */
228         __u8 i_advise;                  /* file hints */
229         __u8 i_inline;                  /* file inline flags */
230         __le32 i_uid;                   /* user ID */
231         __le32 i_gid;                   /* group ID */
232         __le32 i_links;                 /* links count */
233         __le64 i_size;                  /* file size in bytes */
234         __le64 i_blocks;                /* file size in blocks */
235         __le64 i_atime;                 /* access time */
236         __le64 i_ctime;                 /* change time */
237         __le64 i_mtime;                 /* modification time */
238         __le32 i_atime_nsec;            /* access time in nano scale */
239         __le32 i_ctime_nsec;            /* change time in nano scale */
240         __le32 i_mtime_nsec;            /* modification time in nano scale */
241         __le32 i_generation;            /* file version (for NFS) */
242         union {
243                 __le32 i_current_depth; /* only for directory depth */
244                 __le16 i_gc_failures;   /*
245                                          * # of gc failures on pinned file.
246                                          * only for regular files.
247                                          */
248         };
249         __le32 i_xattr_nid;             /* nid to save xattr */
250         __le32 i_flags;                 /* file attributes */
251         __le32 i_pino;                  /* parent inode number */
252         __le32 i_namelen;               /* file name length */
253         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
254         __u8 i_dir_level;               /* dentry_level for large dir */
255 
256         struct f2fs_extent i_ext;       /* caching a largest extent */
257 
258         union {
259                 struct {
260                         __le16 i_extra_isize;   /* extra inode attribute size */
261                         __le16 i_inline_xattr_size;     /* inline xattr size, unit: 4 bytes */
262                         __le32 i_projid;        /* project id */
263                         __le32 i_inode_checksum;/* inode meta checksum */
264                         __le64 i_crtime;        /* creation time */
265                         __le32 i_crtime_nsec;   /* creation time in nano scale */
266                         __le32 i_extra_end[0];  /* for attribute size calculation */
267                 } __packed;
268                 __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
269         };
270         __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
271                                                 double_indirect(1) node id */
272 } __packed;
273 
274 struct direct_node {
275         __le32 addr[DEF_ADDRS_PER_BLOCK];       /* array of data block address */
276 } __packed;
277 
278 struct indirect_node {
279         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
280 } __packed;
281 
282 enum {
283         COLD_BIT_SHIFT = 0,
284         FSYNC_BIT_SHIFT,
285         DENT_BIT_SHIFT,
286         OFFSET_BIT_SHIFT
287 };
288 
289 #define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
290 
291 struct node_footer {
292         __le32 nid;             /* node id */
293         __le32 ino;             /* inode number */
294         __le32 flag;            /* include cold/fsync/dentry marks and offset */
295         __le64 cp_ver;          /* checkpoint version */
296         __le32 next_blkaddr;    /* next node page block address */
297 } __packed;
298 
299 struct f2fs_node {
300         /* can be one of three types: inode, direct, and indirect types */
301         union {
302                 struct f2fs_inode i;
303                 struct direct_node dn;
304                 struct indirect_node in;
305         };
306         struct node_footer footer;
307 } __packed;
308 
309 /*
310  * For NAT entries
311  */
312 #define NAT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_nat_entry))
313 
314 struct f2fs_nat_entry {
315         __u8 version;           /* latest version of cached nat entry */
316         __le32 ino;             /* inode number */
317         __le32 block_addr;      /* block address */
318 } __packed;
319 
320 struct f2fs_nat_block {
321         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
322 } __packed;
323 
324 /*
325  * For SIT entries
326  *
327  * Each segment is 2MB in size by default so that a bitmap for validity of
328  * there-in blocks should occupy 64 bytes, 512 bits.
329  * Not allow to change this.
330  */
331 #define SIT_VBLOCK_MAP_SIZE 64
332 #define SIT_ENTRY_PER_BLOCK (PAGE_SIZE / sizeof(struct f2fs_sit_entry))
333 
334 /*
335  * F2FS uses 4 bytes to represent block address. As a result, supported size of
336  * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
337  */
338 #define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)
339 
340 /*
341  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
342  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
343  * [9:0] : valid block count
344  */
345 #define SIT_VBLOCKS_SHIFT       10
346 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
347 #define GET_SIT_VBLOCKS(raw_sit)                                \
348         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
349 #define GET_SIT_TYPE(raw_sit)                                   \
350         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
351          >> SIT_VBLOCKS_SHIFT)
352 
353 struct f2fs_sit_entry {
354         __le16 vblocks;                         /* reference above */
355         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
356         __le64 mtime;                           /* segment age for cleaning */
357 } __packed;
358 
359 struct f2fs_sit_block {
360         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
361 } __packed;
362 
363 /*
364  * For segment summary
365  *
366  * One summary block contains exactly 512 summary entries, which represents
367  * exactly 2MB segment by default. Not allow to change the basic units.
368  *
369  * NOTE: For initializing fields, you must use set_summary
370  *
371  * - If data page, nid represents dnode's nid
372  * - If node page, nid represents the node page's nid.
373  *
374  * The ofs_in_node is used by only data page. It represents offset
375  * from node's page's beginning to get a data block address.
376  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
377  */
378 #define ENTRIES_IN_SUM          512
379 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
380 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
381 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
382 
383 /* a summary entry for a 4KB-sized block in a segment */
384 struct f2fs_summary {
385         __le32 nid;             /* parent node id */
386         union {
387                 __u8 reserved[3];
388                 struct {
389                         __u8 version;           /* node version number */
390                         __le16 ofs_in_node;     /* block index in parent node */
391                 } __packed;
392         };
393 } __packed;
394 
395 /* summary block type, node or data, is stored to the summary_footer */
396 #define SUM_TYPE_NODE           (1)
397 #define SUM_TYPE_DATA           (0)
398 
399 struct summary_footer {
400         unsigned char entry_type;       /* SUM_TYPE_XXX */
401         __le32 check_sum;               /* summary checksum */
402 } __packed;
403 
404 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
405                                 SUM_ENTRY_SIZE)
406 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
407                                 sizeof(struct nat_journal_entry))
408 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
409                                 sizeof(struct nat_journal_entry))
410 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
411                                 sizeof(struct sit_journal_entry))
412 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
413                                 sizeof(struct sit_journal_entry))
414 
415 /* Reserved area should make size of f2fs_extra_info equals to
416  * that of nat_journal and sit_journal.
417  */
418 #define EXTRA_INFO_RESERVED     (SUM_JOURNAL_SIZE - 2 - 8)
419 
420 /*
421  * frequently updated NAT/SIT entries can be stored in the spare area in
422  * summary blocks
423  */
424 enum {
425         NAT_JOURNAL = 0,
426         SIT_JOURNAL
427 };
428 
429 struct nat_journal_entry {
430         __le32 nid;
431         struct f2fs_nat_entry ne;
432 } __packed;
433 
434 struct nat_journal {
435         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
436         __u8 reserved[NAT_JOURNAL_RESERVED];
437 } __packed;
438 
439 struct sit_journal_entry {
440         __le32 segno;
441         struct f2fs_sit_entry se;
442 } __packed;
443 
444 struct sit_journal {
445         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
446         __u8 reserved[SIT_JOURNAL_RESERVED];
447 } __packed;
448 
449 struct f2fs_extra_info {
450         __le64 kbytes_written;
451         __u8 reserved[EXTRA_INFO_RESERVED];
452 } __packed;
453 
454 struct f2fs_journal {
455         union {
456                 __le16 n_nats;
457                 __le16 n_sits;
458         };
459         /* spare area is used by NAT or SIT journals or extra info */
460         union {
461                 struct nat_journal nat_j;
462                 struct sit_journal sit_j;
463                 struct f2fs_extra_info info;
464         };
465 } __packed;
466 
467 /* 4KB-sized summary block structure */
468 struct f2fs_summary_block {
469         struct f2fs_summary entries[ENTRIES_IN_SUM];
470         struct f2fs_journal journal;
471         struct summary_footer footer;
472 } __packed;
473 
474 /*
475  * For directory operations
476  */
477 #define F2FS_DOT_HASH           0
478 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
479 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
480 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
481 
482 typedef __le32  f2fs_hash_t;
483 
484 /* One directory entry slot covers 8bytes-long file name */
485 #define F2FS_SLOT_LEN           8
486 #define F2FS_SLOT_LEN_BITS      3
487 
488 #define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
489 
490 /* MAX level for dir lookup */
491 #define MAX_DIR_HASH_DEPTH      63
492 
493 /* MAX buckets in one level of dir */
494 #define MAX_DIR_BUCKETS         (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
495 
496 /*
497  * space utilization of regular dentry and inline dentry (w/o extra reservation)
498  *              regular dentry          inline dentry (def)     inline dentry (min)
499  * bitmap       1 * 27 = 27             1 * 23 = 23             1 * 1 = 1
500  * reserved     1 * 3 = 3               1 * 7 = 7               1 * 1 = 1
501  * dentry       11 * 214 = 2354         11 * 182 = 2002         11 * 2 = 22
502  * filename     8 * 214 = 1712          8 * 182 = 1456          8 * 2 = 16
503  * total        4096                    3488                    40
504  *
505  * Note: there are more reserved space in inline dentry than in regular
506  * dentry, when converting inline dentry we should handle this carefully.
507  */
508 #define NR_DENTRY_IN_BLOCK      214     /* the number of dentry in a block */
509 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
510 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
511                                         BITS_PER_BYTE)
512 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
513                                 F2FS_SLOT_LEN) * \
514                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
515 #define MIN_INLINE_DENTRY_SIZE          40      /* just include '.' and '..' entries */
516 
517 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
518 struct f2fs_dir_entry {
519         __le32 hash_code;       /* hash code of file name */
520         __le32 ino;             /* inode number */
521         __le16 name_len;        /* length of file name */
522         __u8 file_type;         /* file type */
523 } __packed;
524 
525 /* 4KB-sized directory entry block */
526 struct f2fs_dentry_block {
527         /* validity bitmap for directory entries in each block */
528         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
529         __u8 reserved[SIZE_OF_RESERVED];
530         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
531         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
532 } __packed;
533 
534 /* file types used in inode_info->flags */
535 enum {
536         F2FS_FT_UNKNOWN,
537         F2FS_FT_REG_FILE,
538         F2FS_FT_DIR,
539         F2FS_FT_CHRDEV,
540         F2FS_FT_BLKDEV,
541         F2FS_FT_FIFO,
542         F2FS_FT_SOCK,
543         F2FS_FT_SYMLINK,
544         F2FS_FT_MAX
545 };
546 
547 #define S_SHIFT 12
548 
549 #define F2FS_DEF_PROJID         0       /* default project ID */
550 
551 #endif  /* _LINUX_F2FS_FS_H */
552 

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