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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_LOG_SECTOR_SIZE            9       /* 9 bits for 512 byte */
 19 #define F2FS_LOG_SECTORS_PER_BLOCK      3       /* 4KB: F2FS_BLKSIZE */
 20 #define F2FS_BLKSIZE                    4096    /* support only 4KB block */
 21 #define F2FS_MAX_EXTENSION              64      /* # of extension entries */
 22 
 23 #define NULL_ADDR               ((block_t)0)    /* used as block_t addresses */
 24 #define NEW_ADDR                ((block_t)-1)   /* used as block_t addresses */
 25 
 26 #define F2FS_ROOT_INO(sbi)      (sbi->root_ino_num)
 27 #define F2FS_NODE_INO(sbi)      (sbi->node_ino_num)
 28 #define F2FS_META_INO(sbi)      (sbi->meta_ino_num)
 29 
 30 /* This flag is used by node and meta inodes, and by recovery */
 31 #define GFP_F2FS_ZERO   (GFP_NOFS | __GFP_ZERO)
 32 
 33 /*
 34  * For further optimization on multi-head logs, on-disk layout supports maximum
 35  * 16 logs by default. The number, 16, is expected to cover all the cases
 36  * enoughly. The implementaion currently uses no more than 6 logs.
 37  * Half the logs are used for nodes, and the other half are used for data.
 38  */
 39 #define MAX_ACTIVE_LOGS 16
 40 #define MAX_ACTIVE_NODE_LOGS    8
 41 #define MAX_ACTIVE_DATA_LOGS    8
 42 
 43 /*
 44  * For superblock
 45  */
 46 struct f2fs_super_block {
 47         __le32 magic;                   /* Magic Number */
 48         __le16 major_ver;               /* Major Version */
 49         __le16 minor_ver;               /* Minor Version */
 50         __le32 log_sectorsize;          /* log2 sector size in bytes */
 51         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
 52         __le32 log_blocksize;           /* log2 block size in bytes */
 53         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
 54         __le32 segs_per_sec;            /* # of segments per section */
 55         __le32 secs_per_zone;           /* # of sections per zone */
 56         __le32 checksum_offset;         /* checksum offset inside super block */
 57         __le64 block_count;             /* total # of user blocks */
 58         __le32 section_count;           /* total # of sections */
 59         __le32 segment_count;           /* total # of segments */
 60         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
 61         __le32 segment_count_sit;       /* # of segments for SIT */
 62         __le32 segment_count_nat;       /* # of segments for NAT */
 63         __le32 segment_count_ssa;       /* # of segments for SSA */
 64         __le32 segment_count_main;      /* # of segments for main area */
 65         __le32 segment0_blkaddr;        /* start block address of segment 0 */
 66         __le32 cp_blkaddr;              /* start block address of checkpoint */
 67         __le32 sit_blkaddr;             /* start block address of SIT */
 68         __le32 nat_blkaddr;             /* start block address of NAT */
 69         __le32 ssa_blkaddr;             /* start block address of SSA */
 70         __le32 main_blkaddr;            /* start block address of main area */
 71         __le32 root_ino;                /* root inode number */
 72         __le32 node_ino;                /* node inode number */
 73         __le32 meta_ino;                /* meta inode number */
 74         __u8 uuid[16];                  /* 128-bit uuid for volume */
 75         __le16 volume_name[512];        /* volume name */
 76         __le32 extension_count;         /* # of extensions below */
 77         __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
 78 } __packed;
 79 
 80 /*
 81  * For checkpoint
 82  */
 83 #define CP_ERROR_FLAG           0x00000008
 84 #define CP_COMPACT_SUM_FLAG     0x00000004
 85 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
 86 #define CP_UMOUNT_FLAG          0x00000001
 87 
 88 struct f2fs_checkpoint {
 89         __le64 checkpoint_ver;          /* checkpoint block version number */
 90         __le64 user_block_count;        /* # of user blocks */
 91         __le64 valid_block_count;       /* # of valid blocks in main area */
 92         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
 93         __le32 overprov_segment_count;  /* # of overprovision segments */
 94         __le32 free_segment_count;      /* # of free segments in main area */
 95 
 96         /* information of current node segments */
 97         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
 98         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
 99         /* information of current data segments */
100         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
101         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
102         __le32 ckpt_flags;              /* Flags : umount and journal_present */
103         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
104         __le32 cp_pack_start_sum;       /* start block number of data summary */
105         __le32 valid_node_count;        /* Total number of valid nodes */
106         __le32 valid_inode_count;       /* Total number of valid inodes */
107         __le32 next_free_nid;           /* Next free node number */
108         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
109         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
110         __le32 checksum_offset;         /* checksum offset inside cp block */
111         __le64 elapsed_time;            /* mounted time */
112         /* allocation type of current segment */
113         unsigned char alloc_type[MAX_ACTIVE_LOGS];
114 
115         /* SIT and NAT version bitmap */
116         unsigned char sit_nat_version_bitmap[1];
117 } __packed;
118 
119 /*
120  * For orphan inode management
121  */
122 #define F2FS_ORPHANS_PER_BLOCK  1020
123 
124 struct f2fs_orphan_block {
125         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
126         __le32 reserved;        /* reserved */
127         __le16 blk_addr;        /* block index in current CP */
128         __le16 blk_count;       /* Number of orphan inode blocks in CP */
129         __le32 entry_count;     /* Total number of orphan nodes in current CP */
130         __le32 check_sum;       /* CRC32 for orphan inode block */
131 } __packed;
132 
133 /*
134  * For NODE structure
135  */
136 struct f2fs_extent {
137         __le32 fofs;            /* start file offset of the extent */
138         __le32 blk_addr;        /* start block address of the extent */
139         __le32 len;             /* lengh of the extent */
140 } __packed;
141 
142 #define F2FS_NAME_LEN           255
143 #define ADDRS_PER_INODE         923     /* Address Pointers in an Inode */
144 #define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
145 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
146 
147 struct f2fs_inode {
148         __le16 i_mode;                  /* file mode */
149         __u8 i_advise;                  /* file hints */
150         __u8 i_reserved;                /* reserved */
151         __le32 i_uid;                   /* user ID */
152         __le32 i_gid;                   /* group ID */
153         __le32 i_links;                 /* links count */
154         __le64 i_size;                  /* file size in bytes */
155         __le64 i_blocks;                /* file size in blocks */
156         __le64 i_atime;                 /* access time */
157         __le64 i_ctime;                 /* change time */
158         __le64 i_mtime;                 /* modification time */
159         __le32 i_atime_nsec;            /* access time in nano scale */
160         __le32 i_ctime_nsec;            /* change time in nano scale */
161         __le32 i_mtime_nsec;            /* modification time in nano scale */
162         __le32 i_generation;            /* file version (for NFS) */
163         __le32 i_current_depth;         /* only for directory depth */
164         __le32 i_xattr_nid;             /* nid to save xattr */
165         __le32 i_flags;                 /* file attributes */
166         __le32 i_pino;                  /* parent inode number */
167         __le32 i_namelen;               /* file name length */
168         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
169         __u8 i_reserved2;               /* for backward compatibility */
170 
171         struct f2fs_extent i_ext;       /* caching a largest extent */
172 
173         __le32 i_addr[ADDRS_PER_INODE]; /* Pointers to data blocks */
174 
175         __le32 i_nid[5];                /* direct(2), indirect(2),
176                                                 double_indirect(1) node id */
177 } __packed;
178 
179 struct direct_node {
180         __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
181 } __packed;
182 
183 struct indirect_node {
184         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
185 } __packed;
186 
187 enum {
188         COLD_BIT_SHIFT = 0,
189         FSYNC_BIT_SHIFT,
190         DENT_BIT_SHIFT,
191         OFFSET_BIT_SHIFT
192 };
193 
194 struct node_footer {
195         __le32 nid;             /* node id */
196         __le32 ino;             /* inode nunmber */
197         __le32 flag;            /* include cold/fsync/dentry marks and offset */
198         __le64 cp_ver;          /* checkpoint version */
199         __le32 next_blkaddr;    /* next node page block address */
200 } __packed;
201 
202 struct f2fs_node {
203         /* can be one of three types: inode, direct, and indirect types */
204         union {
205                 struct f2fs_inode i;
206                 struct direct_node dn;
207                 struct indirect_node in;
208         };
209         struct node_footer footer;
210 } __packed;
211 
212 /*
213  * For NAT entries
214  */
215 #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
216 
217 struct f2fs_nat_entry {
218         __u8 version;           /* latest version of cached nat entry */
219         __le32 ino;             /* inode number */
220         __le32 block_addr;      /* block address */
221 } __packed;
222 
223 struct f2fs_nat_block {
224         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
225 } __packed;
226 
227 /*
228  * For SIT entries
229  *
230  * Each segment is 2MB in size by default so that a bitmap for validity of
231  * there-in blocks should occupy 64 bytes, 512 bits.
232  * Not allow to change this.
233  */
234 #define SIT_VBLOCK_MAP_SIZE 64
235 #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
236 
237 /*
238  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
239  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
240  * [9:0] : valid block count
241  */
242 #define SIT_VBLOCKS_SHIFT       10
243 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
244 #define GET_SIT_VBLOCKS(raw_sit)                                \
245         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
246 #define GET_SIT_TYPE(raw_sit)                                   \
247         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
248          >> SIT_VBLOCKS_SHIFT)
249 
250 struct f2fs_sit_entry {
251         __le16 vblocks;                         /* reference above */
252         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
253         __le64 mtime;                           /* segment age for cleaning */
254 } __packed;
255 
256 struct f2fs_sit_block {
257         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
258 } __packed;
259 
260 /*
261  * For segment summary
262  *
263  * One summary block contains exactly 512 summary entries, which represents
264  * exactly 2MB segment by default. Not allow to change the basic units.
265  *
266  * NOTE: For initializing fields, you must use set_summary
267  *
268  * - If data page, nid represents dnode's nid
269  * - If node page, nid represents the node page's nid.
270  *
271  * The ofs_in_node is used by only data page. It represents offset
272  * from node's page's beginning to get a data block address.
273  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
274  */
275 #define ENTRIES_IN_SUM          512
276 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
277 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
278 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
279 
280 /* a summary entry for a 4KB-sized block in a segment */
281 struct f2fs_summary {
282         __le32 nid;             /* parent node id */
283         union {
284                 __u8 reserved[3];
285                 struct {
286                         __u8 version;           /* node version number */
287                         __le16 ofs_in_node;     /* block index in parent node */
288                 } __packed;
289         };
290 } __packed;
291 
292 /* summary block type, node or data, is stored to the summary_footer */
293 #define SUM_TYPE_NODE           (1)
294 #define SUM_TYPE_DATA           (0)
295 
296 struct summary_footer {
297         unsigned char entry_type;       /* SUM_TYPE_XXX */
298         __u32 check_sum;                /* summary checksum */
299 } __packed;
300 
301 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
302                                 SUM_ENTRY_SIZE)
303 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
304                                 sizeof(struct nat_journal_entry))
305 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
306                                 sizeof(struct nat_journal_entry))
307 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
308                                 sizeof(struct sit_journal_entry))
309 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
310                                 sizeof(struct sit_journal_entry))
311 /*
312  * frequently updated NAT/SIT entries can be stored in the spare area in
313  * summary blocks
314  */
315 enum {
316         NAT_JOURNAL = 0,
317         SIT_JOURNAL
318 };
319 
320 struct nat_journal_entry {
321         __le32 nid;
322         struct f2fs_nat_entry ne;
323 } __packed;
324 
325 struct nat_journal {
326         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
327         __u8 reserved[NAT_JOURNAL_RESERVED];
328 } __packed;
329 
330 struct sit_journal_entry {
331         __le32 segno;
332         struct f2fs_sit_entry se;
333 } __packed;
334 
335 struct sit_journal {
336         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
337         __u8 reserved[SIT_JOURNAL_RESERVED];
338 } __packed;
339 
340 /* 4KB-sized summary block structure */
341 struct f2fs_summary_block {
342         struct f2fs_summary entries[ENTRIES_IN_SUM];
343         union {
344                 __le16 n_nats;
345                 __le16 n_sits;
346         };
347         /* spare area is used by NAT or SIT journals */
348         union {
349                 struct nat_journal nat_j;
350                 struct sit_journal sit_j;
351         };
352         struct summary_footer footer;
353 } __packed;
354 
355 /*
356  * For directory operations
357  */
358 #define F2FS_DOT_HASH           0
359 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
360 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
361 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
362 
363 typedef __le32  f2fs_hash_t;
364 
365 /* One directory entry slot covers 8bytes-long file name */
366 #define F2FS_SLOT_LEN           8
367 #define F2FS_SLOT_LEN_BITS      3
368 
369 #define GET_DENTRY_SLOTS(x)     ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
370 
371 /* the number of dentry in a block */
372 #define NR_DENTRY_IN_BLOCK      214
373 
374 /* MAX level for dir lookup */
375 #define MAX_DIR_HASH_DEPTH      63
376 
377 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
378 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
379                                         BITS_PER_BYTE)
380 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
381                                 F2FS_SLOT_LEN) * \
382                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
383 
384 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
385 struct f2fs_dir_entry {
386         __le32 hash_code;       /* hash code of file name */
387         __le32 ino;             /* inode number */
388         __le16 name_len;        /* lengh of file name */
389         __u8 file_type;         /* file type */
390 } __packed;
391 
392 /* 4KB-sized directory entry block */
393 struct f2fs_dentry_block {
394         /* validity bitmap for directory entries in each block */
395         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
396         __u8 reserved[SIZE_OF_RESERVED];
397         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
398         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
399 } __packed;
400 
401 /* file types used in inode_info->flags */
402 enum {
403         F2FS_FT_UNKNOWN,
404         F2FS_FT_REG_FILE,
405         F2FS_FT_DIR,
406         F2FS_FT_CHRDEV,
407         F2FS_FT_BLKDEV,
408         F2FS_FT_FIFO,
409         F2FS_FT_SOCK,
410         F2FS_FT_SYMLINK,
411         F2FS_FT_MAX
412 };
413 
414 #endif  /* _LINUX_F2FS_FS_H */
415 

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