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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)
 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 /* This flag is used by node and meta inodes, and by recovery */
 40 #define GFP_F2FS_ZERO           (GFP_NOFS | __GFP_ZERO)
 41 #define GFP_F2FS_HIGH_ZERO      (GFP_NOFS | __GFP_ZERO | __GFP_HIGHMEM)
 42 
 43 /*
 44  * For further optimization on multi-head logs, on-disk layout supports maximum
 45  * 16 logs by default. The number, 16, is expected to cover all the cases
 46  * enoughly. The implementaion currently uses no more than 6 logs.
 47  * Half the logs are used for nodes, and the other half are used for data.
 48  */
 49 #define MAX_ACTIVE_LOGS 16
 50 #define MAX_ACTIVE_NODE_LOGS    8
 51 #define MAX_ACTIVE_DATA_LOGS    8
 52 
 53 /*
 54  * For superblock
 55  */
 56 struct f2fs_super_block {
 57         __le32 magic;                   /* Magic Number */
 58         __le16 major_ver;               /* Major Version */
 59         __le16 minor_ver;               /* Minor Version */
 60         __le32 log_sectorsize;          /* log2 sector size in bytes */
 61         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
 62         __le32 log_blocksize;           /* log2 block size in bytes */
 63         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
 64         __le32 segs_per_sec;            /* # of segments per section */
 65         __le32 secs_per_zone;           /* # of sections per zone */
 66         __le32 checksum_offset;         /* checksum offset inside super block */
 67         __le64 block_count;             /* total # of user blocks */
 68         __le32 section_count;           /* total # of sections */
 69         __le32 segment_count;           /* total # of segments */
 70         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
 71         __le32 segment_count_sit;       /* # of segments for SIT */
 72         __le32 segment_count_nat;       /* # of segments for NAT */
 73         __le32 segment_count_ssa;       /* # of segments for SSA */
 74         __le32 segment_count_main;      /* # of segments for main area */
 75         __le32 segment0_blkaddr;        /* start block address of segment 0 */
 76         __le32 cp_blkaddr;              /* start block address of checkpoint */
 77         __le32 sit_blkaddr;             /* start block address of SIT */
 78         __le32 nat_blkaddr;             /* start block address of NAT */
 79         __le32 ssa_blkaddr;             /* start block address of SSA */
 80         __le32 main_blkaddr;            /* start block address of main area */
 81         __le32 root_ino;                /* root inode number */
 82         __le32 node_ino;                /* node inode number */
 83         __le32 meta_ino;                /* meta inode number */
 84         __u8 uuid[16];                  /* 128-bit uuid for volume */
 85         __le16 volume_name[512];        /* volume name */
 86         __le32 extension_count;         /* # of extensions below */
 87         __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
 88         __le32 cp_payload;
 89 } __packed;
 90 
 91 /*
 92  * For checkpoint
 93  */
 94 #define CP_FASTBOOT_FLAG        0x00000020
 95 #define CP_FSCK_FLAG            0x00000010
 96 #define CP_ERROR_FLAG           0x00000008
 97 #define CP_COMPACT_SUM_FLAG     0x00000004
 98 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
 99 #define CP_UMOUNT_FLAG          0x00000001
100 
101 #define F2FS_CP_PACKS           2       /* # of checkpoint packs */
102 
103 struct f2fs_checkpoint {
104         __le64 checkpoint_ver;          /* checkpoint block version number */
105         __le64 user_block_count;        /* # of user blocks */
106         __le64 valid_block_count;       /* # of valid blocks in main area */
107         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
108         __le32 overprov_segment_count;  /* # of overprovision segments */
109         __le32 free_segment_count;      /* # of free segments in main area */
110 
111         /* information of current node segments */
112         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
113         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
114         /* information of current data segments */
115         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
116         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
117         __le32 ckpt_flags;              /* Flags : umount and journal_present */
118         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
119         __le32 cp_pack_start_sum;       /* start block number of data summary */
120         __le32 valid_node_count;        /* Total number of valid nodes */
121         __le32 valid_inode_count;       /* Total number of valid inodes */
122         __le32 next_free_nid;           /* Next free node number */
123         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
124         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
125         __le32 checksum_offset;         /* checksum offset inside cp block */
126         __le64 elapsed_time;            /* mounted time */
127         /* allocation type of current segment */
128         unsigned char alloc_type[MAX_ACTIVE_LOGS];
129 
130         /* SIT and NAT version bitmap */
131         unsigned char sit_nat_version_bitmap[1];
132 } __packed;
133 
134 /*
135  * For orphan inode management
136  */
137 #define F2FS_ORPHANS_PER_BLOCK  1020
138 
139 #define GET_ORPHAN_BLOCKS(n)    ((n + F2FS_ORPHANS_PER_BLOCK - 1) / \
140                                         F2FS_ORPHANS_PER_BLOCK)
141 
142 struct f2fs_orphan_block {
143         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
144         __le32 reserved;        /* reserved */
145         __le16 blk_addr;        /* block index in current CP */
146         __le16 blk_count;       /* Number of orphan inode blocks in CP */
147         __le32 entry_count;     /* Total number of orphan nodes in current CP */
148         __le32 check_sum;       /* CRC32 for orphan inode block */
149 } __packed;
150 
151 /*
152  * For NODE structure
153  */
154 struct f2fs_extent {
155         __le32 fofs;            /* start file offset of the extent */
156         __le32 blk;             /* start block address of the extent */
157         __le32 len;             /* lengh of the extent */
158 } __packed;
159 
160 #define F2FS_NAME_LEN           255
161 #define F2FS_INLINE_XATTR_ADDRS 50      /* 200 bytes for inline xattrs */
162 #define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
163 #define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
164 #define ADDRS_PER_INODE(fi)     addrs_per_inode(fi)
165 #define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
166 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
167 
168 #define ADDRS_PER_PAGE(page, fi)        \
169         (IS_INODE(page) ? ADDRS_PER_INODE(fi) : ADDRS_PER_BLOCK)
170 
171 #define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
172 #define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
173 #define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
174 #define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
175 #define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
176 
177 #define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
178 #define F2FS_INLINE_DATA        0x02    /* file inline data flag */
179 #define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
180 #define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
181 #define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
182 
183 #define MAX_INLINE_DATA         (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
184                                                 F2FS_INLINE_XATTR_ADDRS - 1))
185 
186 struct f2fs_inode {
187         __le16 i_mode;                  /* file mode */
188         __u8 i_advise;                  /* file hints */
189         __u8 i_inline;                  /* file inline flags */
190         __le32 i_uid;                   /* user ID */
191         __le32 i_gid;                   /* group ID */
192         __le32 i_links;                 /* links count */
193         __le64 i_size;                  /* file size in bytes */
194         __le64 i_blocks;                /* file size in blocks */
195         __le64 i_atime;                 /* access time */
196         __le64 i_ctime;                 /* change time */
197         __le64 i_mtime;                 /* modification time */
198         __le32 i_atime_nsec;            /* access time in nano scale */
199         __le32 i_ctime_nsec;            /* change time in nano scale */
200         __le32 i_mtime_nsec;            /* modification time in nano scale */
201         __le32 i_generation;            /* file version (for NFS) */
202         __le32 i_current_depth;         /* only for directory depth */
203         __le32 i_xattr_nid;             /* nid to save xattr */
204         __le32 i_flags;                 /* file attributes */
205         __le32 i_pino;                  /* parent inode number */
206         __le32 i_namelen;               /* file name length */
207         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
208         __u8 i_dir_level;               /* dentry_level for large dir */
209 
210         struct f2fs_extent i_ext;       /* caching a largest extent */
211 
212         __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
213 
214         __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
215                                                 double_indirect(1) node id */
216 } __packed;
217 
218 struct direct_node {
219         __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
220 } __packed;
221 
222 struct indirect_node {
223         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
224 } __packed;
225 
226 enum {
227         COLD_BIT_SHIFT = 0,
228         FSYNC_BIT_SHIFT,
229         DENT_BIT_SHIFT,
230         OFFSET_BIT_SHIFT
231 };
232 
233 #define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
234 
235 struct node_footer {
236         __le32 nid;             /* node id */
237         __le32 ino;             /* inode nunmber */
238         __le32 flag;            /* include cold/fsync/dentry marks and offset */
239         __le64 cp_ver;          /* checkpoint version */
240         __le32 next_blkaddr;    /* next node page block address */
241 } __packed;
242 
243 struct f2fs_node {
244         /* can be one of three types: inode, direct, and indirect types */
245         union {
246                 struct f2fs_inode i;
247                 struct direct_node dn;
248                 struct indirect_node in;
249         };
250         struct node_footer footer;
251 } __packed;
252 
253 /*
254  * For NAT entries
255  */
256 #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
257 
258 struct f2fs_nat_entry {
259         __u8 version;           /* latest version of cached nat entry */
260         __le32 ino;             /* inode number */
261         __le32 block_addr;      /* block address */
262 } __packed;
263 
264 struct f2fs_nat_block {
265         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
266 } __packed;
267 
268 /*
269  * For SIT entries
270  *
271  * Each segment is 2MB in size by default so that a bitmap for validity of
272  * there-in blocks should occupy 64 bytes, 512 bits.
273  * Not allow to change this.
274  */
275 #define SIT_VBLOCK_MAP_SIZE 64
276 #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
277 
278 /*
279  * F2FS uses 4 bytes to represent block address. As a result, supported size of
280  * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
281  */
282 #define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)
283 
284 /*
285  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
286  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
287  * [9:0] : valid block count
288  */
289 #define SIT_VBLOCKS_SHIFT       10
290 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
291 #define GET_SIT_VBLOCKS(raw_sit)                                \
292         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
293 #define GET_SIT_TYPE(raw_sit)                                   \
294         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
295          >> SIT_VBLOCKS_SHIFT)
296 
297 struct f2fs_sit_entry {
298         __le16 vblocks;                         /* reference above */
299         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
300         __le64 mtime;                           /* segment age for cleaning */
301 } __packed;
302 
303 struct f2fs_sit_block {
304         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
305 } __packed;
306 
307 /*
308  * For segment summary
309  *
310  * One summary block contains exactly 512 summary entries, which represents
311  * exactly 2MB segment by default. Not allow to change the basic units.
312  *
313  * NOTE: For initializing fields, you must use set_summary
314  *
315  * - If data page, nid represents dnode's nid
316  * - If node page, nid represents the node page's nid.
317  *
318  * The ofs_in_node is used by only data page. It represents offset
319  * from node's page's beginning to get a data block address.
320  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
321  */
322 #define ENTRIES_IN_SUM          512
323 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
324 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
325 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
326 
327 /* a summary entry for a 4KB-sized block in a segment */
328 struct f2fs_summary {
329         __le32 nid;             /* parent node id */
330         union {
331                 __u8 reserved[3];
332                 struct {
333                         __u8 version;           /* node version number */
334                         __le16 ofs_in_node;     /* block index in parent node */
335                 } __packed;
336         };
337 } __packed;
338 
339 /* summary block type, node or data, is stored to the summary_footer */
340 #define SUM_TYPE_NODE           (1)
341 #define SUM_TYPE_DATA           (0)
342 
343 struct summary_footer {
344         unsigned char entry_type;       /* SUM_TYPE_XXX */
345         __u32 check_sum;                /* summary checksum */
346 } __packed;
347 
348 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
349                                 SUM_ENTRY_SIZE)
350 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
351                                 sizeof(struct nat_journal_entry))
352 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
353                                 sizeof(struct nat_journal_entry))
354 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
355                                 sizeof(struct sit_journal_entry))
356 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
357                                 sizeof(struct sit_journal_entry))
358 /*
359  * frequently updated NAT/SIT entries can be stored in the spare area in
360  * summary blocks
361  */
362 enum {
363         NAT_JOURNAL = 0,
364         SIT_JOURNAL
365 };
366 
367 struct nat_journal_entry {
368         __le32 nid;
369         struct f2fs_nat_entry ne;
370 } __packed;
371 
372 struct nat_journal {
373         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
374         __u8 reserved[NAT_JOURNAL_RESERVED];
375 } __packed;
376 
377 struct sit_journal_entry {
378         __le32 segno;
379         struct f2fs_sit_entry se;
380 } __packed;
381 
382 struct sit_journal {
383         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
384         __u8 reserved[SIT_JOURNAL_RESERVED];
385 } __packed;
386 
387 /* 4KB-sized summary block structure */
388 struct f2fs_summary_block {
389         struct f2fs_summary entries[ENTRIES_IN_SUM];
390         union {
391                 __le16 n_nats;
392                 __le16 n_sits;
393         };
394         /* spare area is used by NAT or SIT journals */
395         union {
396                 struct nat_journal nat_j;
397                 struct sit_journal sit_j;
398         };
399         struct summary_footer footer;
400 } __packed;
401 
402 /*
403  * For directory operations
404  */
405 #define F2FS_DOT_HASH           0
406 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
407 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
408 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
409 
410 typedef __le32  f2fs_hash_t;
411 
412 /* One directory entry slot covers 8bytes-long file name */
413 #define F2FS_SLOT_LEN           8
414 #define F2FS_SLOT_LEN_BITS      3
415 
416 #define GET_DENTRY_SLOTS(x)     ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
417 
418 /* the number of dentry in a block */
419 #define NR_DENTRY_IN_BLOCK      214
420 
421 /* MAX level for dir lookup */
422 #define MAX_DIR_HASH_DEPTH      63
423 
424 /* MAX buckets in one level of dir */
425 #define MAX_DIR_BUCKETS         (1 << ((MAX_DIR_HASH_DEPTH / 2) - 1))
426 
427 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
428 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
429                                         BITS_PER_BYTE)
430 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
431                                 F2FS_SLOT_LEN) * \
432                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
433 
434 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
435 struct f2fs_dir_entry {
436         __le32 hash_code;       /* hash code of file name */
437         __le32 ino;             /* inode number */
438         __le16 name_len;        /* lengh of file name */
439         __u8 file_type;         /* file type */
440 } __packed;
441 
442 /* 4KB-sized directory entry block */
443 struct f2fs_dentry_block {
444         /* validity bitmap for directory entries in each block */
445         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
446         __u8 reserved[SIZE_OF_RESERVED];
447         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
448         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
449 } __packed;
450 
451 /* for inline dir */
452 #define NR_INLINE_DENTRY        (MAX_INLINE_DATA * BITS_PER_BYTE / \
453                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
454                                 BITS_PER_BYTE + 1))
455 #define INLINE_DENTRY_BITMAP_SIZE       ((NR_INLINE_DENTRY + \
456                                         BITS_PER_BYTE - 1) / BITS_PER_BYTE)
457 #define INLINE_RESERVED_SIZE    (MAX_INLINE_DATA - \
458                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
459                                 NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))
460 
461 /* inline directory entry structure */
462 struct f2fs_inline_dentry {
463         __u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
464         __u8 reserved[INLINE_RESERVED_SIZE];
465         struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
466         __u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
467 } __packed;
468 
469 /* file types used in inode_info->flags */
470 enum {
471         F2FS_FT_UNKNOWN,
472         F2FS_FT_REG_FILE,
473         F2FS_FT_DIR,
474         F2FS_FT_CHRDEV,
475         F2FS_FT_BLKDEV,
476         F2FS_FT_FIFO,
477         F2FS_FT_SOCK,
478         F2FS_FT_SYMLINK,
479         F2FS_FT_MAX
480 };
481 
482 #endif  /* _LINUX_F2FS_FS_H */
483 

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