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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 #define VERSION_LEN     256
 54 #define MAX_VOLUME_NAME         512
 55 
 56 /*
 57  * For superblock
 58  */
 59 struct f2fs_super_block {
 60         __le32 magic;                   /* Magic Number */
 61         __le16 major_ver;               /* Major Version */
 62         __le16 minor_ver;               /* Minor Version */
 63         __le32 log_sectorsize;          /* log2 sector size in bytes */
 64         __le32 log_sectors_per_block;   /* log2 # of sectors per block */
 65         __le32 log_blocksize;           /* log2 block size in bytes */
 66         __le32 log_blocks_per_seg;      /* log2 # of blocks per segment */
 67         __le32 segs_per_sec;            /* # of segments per section */
 68         __le32 secs_per_zone;           /* # of sections per zone */
 69         __le32 checksum_offset;         /* checksum offset inside super block */
 70         __le64 block_count;             /* total # of user blocks */
 71         __le32 section_count;           /* total # of sections */
 72         __le32 segment_count;           /* total # of segments */
 73         __le32 segment_count_ckpt;      /* # of segments for checkpoint */
 74         __le32 segment_count_sit;       /* # of segments for SIT */
 75         __le32 segment_count_nat;       /* # of segments for NAT */
 76         __le32 segment_count_ssa;       /* # of segments for SSA */
 77         __le32 segment_count_main;      /* # of segments for main area */
 78         __le32 segment0_blkaddr;        /* start block address of segment 0 */
 79         __le32 cp_blkaddr;              /* start block address of checkpoint */
 80         __le32 sit_blkaddr;             /* start block address of SIT */
 81         __le32 nat_blkaddr;             /* start block address of NAT */
 82         __le32 ssa_blkaddr;             /* start block address of SSA */
 83         __le32 main_blkaddr;            /* start block address of main area */
 84         __le32 root_ino;                /* root inode number */
 85         __le32 node_ino;                /* node inode number */
 86         __le32 meta_ino;                /* meta inode number */
 87         __u8 uuid[16];                  /* 128-bit uuid for volume */
 88         __le16 volume_name[MAX_VOLUME_NAME];    /* volume name */
 89         __le32 extension_count;         /* # of extensions below */
 90         __u8 extension_list[F2FS_MAX_EXTENSION][8];     /* extension array */
 91         __le32 cp_payload;
 92         __u8 version[VERSION_LEN];      /* the kernel version */
 93         __u8 init_version[VERSION_LEN]; /* the initial kernel version */
 94         __le32 feature;                 /* defined features */
 95         __u8 encryption_level;          /* versioning level for encryption */
 96         __u8 encrypt_pw_salt[16];       /* Salt used for string2key algorithm */
 97         __u8 reserved[871];             /* valid reserved region */
 98 } __packed;
 99 
100 /*
101  * For checkpoint
102  */
103 #define CP_FASTBOOT_FLAG        0x00000020
104 #define CP_FSCK_FLAG            0x00000010
105 #define CP_ERROR_FLAG           0x00000008
106 #define CP_COMPACT_SUM_FLAG     0x00000004
107 #define CP_ORPHAN_PRESENT_FLAG  0x00000002
108 #define CP_UMOUNT_FLAG          0x00000001
109 
110 #define F2FS_CP_PACKS           2       /* # of checkpoint packs */
111 
112 struct f2fs_checkpoint {
113         __le64 checkpoint_ver;          /* checkpoint block version number */
114         __le64 user_block_count;        /* # of user blocks */
115         __le64 valid_block_count;       /* # of valid blocks in main area */
116         __le32 rsvd_segment_count;      /* # of reserved segments for gc */
117         __le32 overprov_segment_count;  /* # of overprovision segments */
118         __le32 free_segment_count;      /* # of free segments in main area */
119 
120         /* information of current node segments */
121         __le32 cur_node_segno[MAX_ACTIVE_NODE_LOGS];
122         __le16 cur_node_blkoff[MAX_ACTIVE_NODE_LOGS];
123         /* information of current data segments */
124         __le32 cur_data_segno[MAX_ACTIVE_DATA_LOGS];
125         __le16 cur_data_blkoff[MAX_ACTIVE_DATA_LOGS];
126         __le32 ckpt_flags;              /* Flags : umount and journal_present */
127         __le32 cp_pack_total_block_count;       /* total # of one cp pack */
128         __le32 cp_pack_start_sum;       /* start block number of data summary */
129         __le32 valid_node_count;        /* Total number of valid nodes */
130         __le32 valid_inode_count;       /* Total number of valid inodes */
131         __le32 next_free_nid;           /* Next free node number */
132         __le32 sit_ver_bitmap_bytesize; /* Default value 64 */
133         __le32 nat_ver_bitmap_bytesize; /* Default value 256 */
134         __le32 checksum_offset;         /* checksum offset inside cp block */
135         __le64 elapsed_time;            /* mounted time */
136         /* allocation type of current segment */
137         unsigned char alloc_type[MAX_ACTIVE_LOGS];
138 
139         /* SIT and NAT version bitmap */
140         unsigned char sit_nat_version_bitmap[1];
141 } __packed;
142 
143 /*
144  * For orphan inode management
145  */
146 #define F2FS_ORPHANS_PER_BLOCK  1020
147 
148 #define GET_ORPHAN_BLOCKS(n)    ((n + F2FS_ORPHANS_PER_BLOCK - 1) / \
149                                         F2FS_ORPHANS_PER_BLOCK)
150 
151 struct f2fs_orphan_block {
152         __le32 ino[F2FS_ORPHANS_PER_BLOCK];     /* inode numbers */
153         __le32 reserved;        /* reserved */
154         __le16 blk_addr;        /* block index in current CP */
155         __le16 blk_count;       /* Number of orphan inode blocks in CP */
156         __le32 entry_count;     /* Total number of orphan nodes in current CP */
157         __le32 check_sum;       /* CRC32 for orphan inode block */
158 } __packed;
159 
160 /*
161  * For NODE structure
162  */
163 struct f2fs_extent {
164         __le32 fofs;            /* start file offset of the extent */
165         __le32 blk;             /* start block address of the extent */
166         __le32 len;             /* lengh of the extent */
167 } __packed;
168 
169 #define F2FS_NAME_LEN           255
170 #define F2FS_INLINE_XATTR_ADDRS 50      /* 200 bytes for inline xattrs */
171 #define DEF_ADDRS_PER_INODE     923     /* Address Pointers in an Inode */
172 #define DEF_NIDS_PER_INODE      5       /* Node IDs in an Inode */
173 #define ADDRS_PER_INODE(fi)     addrs_per_inode(fi)
174 #define ADDRS_PER_BLOCK         1018    /* Address Pointers in a Direct Block */
175 #define NIDS_PER_BLOCK          1018    /* Node IDs in an Indirect Block */
176 
177 #define ADDRS_PER_PAGE(page, fi)        \
178         (IS_INODE(page) ? ADDRS_PER_INODE(fi) : ADDRS_PER_BLOCK)
179 
180 #define NODE_DIR1_BLOCK         (DEF_ADDRS_PER_INODE + 1)
181 #define NODE_DIR2_BLOCK         (DEF_ADDRS_PER_INODE + 2)
182 #define NODE_IND1_BLOCK         (DEF_ADDRS_PER_INODE + 3)
183 #define NODE_IND2_BLOCK         (DEF_ADDRS_PER_INODE + 4)
184 #define NODE_DIND_BLOCK         (DEF_ADDRS_PER_INODE + 5)
185 
186 #define F2FS_INLINE_XATTR       0x01    /* file inline xattr flag */
187 #define F2FS_INLINE_DATA        0x02    /* file inline data flag */
188 #define F2FS_INLINE_DENTRY      0x04    /* file inline dentry flag */
189 #define F2FS_DATA_EXIST         0x08    /* file inline data exist flag */
190 #define F2FS_INLINE_DOTS        0x10    /* file having implicit dot dentries */
191 
192 #define MAX_INLINE_DATA         (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
193                                                 F2FS_INLINE_XATTR_ADDRS - 1))
194 
195 struct f2fs_inode {
196         __le16 i_mode;                  /* file mode */
197         __u8 i_advise;                  /* file hints */
198         __u8 i_inline;                  /* file inline flags */
199         __le32 i_uid;                   /* user ID */
200         __le32 i_gid;                   /* group ID */
201         __le32 i_links;                 /* links count */
202         __le64 i_size;                  /* file size in bytes */
203         __le64 i_blocks;                /* file size in blocks */
204         __le64 i_atime;                 /* access time */
205         __le64 i_ctime;                 /* change time */
206         __le64 i_mtime;                 /* modification time */
207         __le32 i_atime_nsec;            /* access time in nano scale */
208         __le32 i_ctime_nsec;            /* change time in nano scale */
209         __le32 i_mtime_nsec;            /* modification time in nano scale */
210         __le32 i_generation;            /* file version (for NFS) */
211         __le32 i_current_depth;         /* only for directory depth */
212         __le32 i_xattr_nid;             /* nid to save xattr */
213         __le32 i_flags;                 /* file attributes */
214         __le32 i_pino;                  /* parent inode number */
215         __le32 i_namelen;               /* file name length */
216         __u8 i_name[F2FS_NAME_LEN];     /* file name for SPOR */
217         __u8 i_dir_level;               /* dentry_level for large dir */
218 
219         struct f2fs_extent i_ext;       /* caching a largest extent */
220 
221         __le32 i_addr[DEF_ADDRS_PER_INODE];     /* Pointers to data blocks */
222 
223         __le32 i_nid[DEF_NIDS_PER_INODE];       /* direct(2), indirect(2),
224                                                 double_indirect(1) node id */
225 } __packed;
226 
227 struct direct_node {
228         __le32 addr[ADDRS_PER_BLOCK];   /* array of data block address */
229 } __packed;
230 
231 struct indirect_node {
232         __le32 nid[NIDS_PER_BLOCK];     /* array of data block address */
233 } __packed;
234 
235 enum {
236         COLD_BIT_SHIFT = 0,
237         FSYNC_BIT_SHIFT,
238         DENT_BIT_SHIFT,
239         OFFSET_BIT_SHIFT
240 };
241 
242 #define OFFSET_BIT_MASK         (0x07)  /* (0x01 << OFFSET_BIT_SHIFT) - 1 */
243 
244 struct node_footer {
245         __le32 nid;             /* node id */
246         __le32 ino;             /* inode nunmber */
247         __le32 flag;            /* include cold/fsync/dentry marks and offset */
248         __le64 cp_ver;          /* checkpoint version */
249         __le32 next_blkaddr;    /* next node page block address */
250 } __packed;
251 
252 struct f2fs_node {
253         /* can be one of three types: inode, direct, and indirect types */
254         union {
255                 struct f2fs_inode i;
256                 struct direct_node dn;
257                 struct indirect_node in;
258         };
259         struct node_footer footer;
260 } __packed;
261 
262 /*
263  * For NAT entries
264  */
265 #define NAT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_nat_entry))
266 
267 struct f2fs_nat_entry {
268         __u8 version;           /* latest version of cached nat entry */
269         __le32 ino;             /* inode number */
270         __le32 block_addr;      /* block address */
271 } __packed;
272 
273 struct f2fs_nat_block {
274         struct f2fs_nat_entry entries[NAT_ENTRY_PER_BLOCK];
275 } __packed;
276 
277 /*
278  * For SIT entries
279  *
280  * Each segment is 2MB in size by default so that a bitmap for validity of
281  * there-in blocks should occupy 64 bytes, 512 bits.
282  * Not allow to change this.
283  */
284 #define SIT_VBLOCK_MAP_SIZE 64
285 #define SIT_ENTRY_PER_BLOCK (PAGE_CACHE_SIZE / sizeof(struct f2fs_sit_entry))
286 
287 /*
288  * Note that f2fs_sit_entry->vblocks has the following bit-field information.
289  * [15:10] : allocation type such as CURSEG_XXXX_TYPE
290  * [9:0] : valid block count
291  */
292 #define SIT_VBLOCKS_SHIFT       10
293 #define SIT_VBLOCKS_MASK        ((1 << SIT_VBLOCKS_SHIFT) - 1)
294 #define GET_SIT_VBLOCKS(raw_sit)                                \
295         (le16_to_cpu((raw_sit)->vblocks) & SIT_VBLOCKS_MASK)
296 #define GET_SIT_TYPE(raw_sit)                                   \
297         ((le16_to_cpu((raw_sit)->vblocks) & ~SIT_VBLOCKS_MASK)  \
298          >> SIT_VBLOCKS_SHIFT)
299 
300 struct f2fs_sit_entry {
301         __le16 vblocks;                         /* reference above */
302         __u8 valid_map[SIT_VBLOCK_MAP_SIZE];    /* bitmap for valid blocks */
303         __le64 mtime;                           /* segment age for cleaning */
304 } __packed;
305 
306 struct f2fs_sit_block {
307         struct f2fs_sit_entry entries[SIT_ENTRY_PER_BLOCK];
308 } __packed;
309 
310 /*
311  * For segment summary
312  *
313  * One summary block contains exactly 512 summary entries, which represents
314  * exactly 2MB segment by default. Not allow to change the basic units.
315  *
316  * NOTE: For initializing fields, you must use set_summary
317  *
318  * - If data page, nid represents dnode's nid
319  * - If node page, nid represents the node page's nid.
320  *
321  * The ofs_in_node is used by only data page. It represents offset
322  * from node's page's beginning to get a data block address.
323  * ex) data_blkaddr = (block_t)(nodepage_start_address + ofs_in_node)
324  */
325 #define ENTRIES_IN_SUM          512
326 #define SUMMARY_SIZE            (7)     /* sizeof(struct summary) */
327 #define SUM_FOOTER_SIZE         (5)     /* sizeof(struct summary_footer) */
328 #define SUM_ENTRY_SIZE          (SUMMARY_SIZE * ENTRIES_IN_SUM)
329 
330 /* a summary entry for a 4KB-sized block in a segment */
331 struct f2fs_summary {
332         __le32 nid;             /* parent node id */
333         union {
334                 __u8 reserved[3];
335                 struct {
336                         __u8 version;           /* node version number */
337                         __le16 ofs_in_node;     /* block index in parent node */
338                 } __packed;
339         };
340 } __packed;
341 
342 /* summary block type, node or data, is stored to the summary_footer */
343 #define SUM_TYPE_NODE           (1)
344 #define SUM_TYPE_DATA           (0)
345 
346 struct summary_footer {
347         unsigned char entry_type;       /* SUM_TYPE_XXX */
348         __u32 check_sum;                /* summary checksum */
349 } __packed;
350 
351 #define SUM_JOURNAL_SIZE        (F2FS_BLKSIZE - SUM_FOOTER_SIZE -\
352                                 SUM_ENTRY_SIZE)
353 #define NAT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
354                                 sizeof(struct nat_journal_entry))
355 #define NAT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
356                                 sizeof(struct nat_journal_entry))
357 #define SIT_JOURNAL_ENTRIES     ((SUM_JOURNAL_SIZE - 2) /\
358                                 sizeof(struct sit_journal_entry))
359 #define SIT_JOURNAL_RESERVED    ((SUM_JOURNAL_SIZE - 2) %\
360                                 sizeof(struct sit_journal_entry))
361 /*
362  * frequently updated NAT/SIT entries can be stored in the spare area in
363  * summary blocks
364  */
365 enum {
366         NAT_JOURNAL = 0,
367         SIT_JOURNAL
368 };
369 
370 struct nat_journal_entry {
371         __le32 nid;
372         struct f2fs_nat_entry ne;
373 } __packed;
374 
375 struct nat_journal {
376         struct nat_journal_entry entries[NAT_JOURNAL_ENTRIES];
377         __u8 reserved[NAT_JOURNAL_RESERVED];
378 } __packed;
379 
380 struct sit_journal_entry {
381         __le32 segno;
382         struct f2fs_sit_entry se;
383 } __packed;
384 
385 struct sit_journal {
386         struct sit_journal_entry entries[SIT_JOURNAL_ENTRIES];
387         __u8 reserved[SIT_JOURNAL_RESERVED];
388 } __packed;
389 
390 /* 4KB-sized summary block structure */
391 struct f2fs_summary_block {
392         struct f2fs_summary entries[ENTRIES_IN_SUM];
393         union {
394                 __le16 n_nats;
395                 __le16 n_sits;
396         };
397         /* spare area is used by NAT or SIT journals */
398         union {
399                 struct nat_journal nat_j;
400                 struct sit_journal sit_j;
401         };
402         struct summary_footer footer;
403 } __packed;
404 
405 /*
406  * For directory operations
407  */
408 #define F2FS_DOT_HASH           0
409 #define F2FS_DDOT_HASH          F2FS_DOT_HASH
410 #define F2FS_MAX_HASH           (~((0x3ULL) << 62))
411 #define F2FS_HASH_COL_BIT       ((0x1ULL) << 63)
412 
413 typedef __le32  f2fs_hash_t;
414 
415 /* One directory entry slot covers 8bytes-long file name */
416 #define F2FS_SLOT_LEN           8
417 #define F2FS_SLOT_LEN_BITS      3
418 
419 #define GET_DENTRY_SLOTS(x)     ((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
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 /*
428  * space utilization of regular dentry and inline dentry
429  *              regular dentry                  inline dentry
430  * bitmap       1 * 27 = 27                     1 * 23 = 23
431  * reserved     1 * 3 = 3                       1 * 7 = 7
432  * dentry       11 * 214 = 2354                 11 * 182 = 2002
433  * filename     8 * 214 = 1712                  8 * 182 = 1456
434  * total        4096                            3488
435  *
436  * Note: there are more reserved space in inline dentry than in regular
437  * dentry, when converting inline dentry we should handle this carefully.
438  */
439 #define NR_DENTRY_IN_BLOCK      214     /* the number of dentry in a block */
440 #define SIZE_OF_DIR_ENTRY       11      /* by byte */
441 #define SIZE_OF_DENTRY_BITMAP   ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \
442                                         BITS_PER_BYTE)
443 #define SIZE_OF_RESERVED        (PAGE_SIZE - ((SIZE_OF_DIR_ENTRY + \
444                                 F2FS_SLOT_LEN) * \
445                                 NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP))
446 
447 /* One directory entry slot representing F2FS_SLOT_LEN-sized file name */
448 struct f2fs_dir_entry {
449         __le32 hash_code;       /* hash code of file name */
450         __le32 ino;             /* inode number */
451         __le16 name_len;        /* lengh of file name */
452         __u8 file_type;         /* file type */
453 } __packed;
454 
455 /* 4KB-sized directory entry block */
456 struct f2fs_dentry_block {
457         /* validity bitmap for directory entries in each block */
458         __u8 dentry_bitmap[SIZE_OF_DENTRY_BITMAP];
459         __u8 reserved[SIZE_OF_RESERVED];
460         struct f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK];
461         __u8 filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN];
462 } __packed;
463 
464 /* for inline dir */
465 #define NR_INLINE_DENTRY        (MAX_INLINE_DATA * BITS_PER_BYTE / \
466                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
467                                 BITS_PER_BYTE + 1))
468 #define INLINE_DENTRY_BITMAP_SIZE       ((NR_INLINE_DENTRY + \
469                                         BITS_PER_BYTE - 1) / BITS_PER_BYTE)
470 #define INLINE_RESERVED_SIZE    (MAX_INLINE_DATA - \
471                                 ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \
472                                 NR_INLINE_DENTRY + INLINE_DENTRY_BITMAP_SIZE))
473 
474 /* inline directory entry structure */
475 struct f2fs_inline_dentry {
476         __u8 dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE];
477         __u8 reserved[INLINE_RESERVED_SIZE];
478         struct f2fs_dir_entry dentry[NR_INLINE_DENTRY];
479         __u8 filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN];
480 } __packed;
481 
482 /* file types used in inode_info->flags */
483 enum {
484         F2FS_FT_UNKNOWN,
485         F2FS_FT_REG_FILE,
486         F2FS_FT_DIR,
487         F2FS_FT_CHRDEV,
488         F2FS_FT_BLKDEV,
489         F2FS_FT_FIFO,
490         F2FS_FT_SOCK,
491         F2FS_FT_SYMLINK,
492         F2FS_FT_MAX
493 };
494 
495 #endif  /* _LINUX_F2FS_FS_H */
496 

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