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disable some mediatekl custom warnings
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / nilfs2_fs.h
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eed10e39
KS		 1/*
2 * nilfs2_fs.h - NILFS2 on-disk structures and common declarations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
c486f389
RK		 7 * it under the terms of the GNU Lesser General Public License as published
8 * by the Free Software Foundation; either version 2.1 of the License, or
eed10e39
KS		 9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c486f389 14 * GNU Lesser General Public License for more details.
eed10e39 15 *
c486f389 16 * You should have received a copy of the GNU Lesser General Public License
eed10e39
KS		 17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Koji Sato <koji@osrg.net>
21 * Ryusuke Konishi <ryusuke@osrg.net>
22 */
23/*
24 * linux/include/linux/ext2_fs.h
25 *
26 * Copyright (C) 1992, 1993, 1994, 1995
27 * Remy Card (card@masi.ibp.fr)
28 * Laboratoire MASI - Institut Blaise Pascal
29 * Universite Pierre et Marie Curie (Paris VI)
30 *
31 * from
32 *
33 * linux/include/linux/minix_fs.h
34 *
35 * Copyright (C) 1991, 1992 Linus Torvalds
36 */
37
38#ifndef _LINUX_NILFS_FS_H
39#define _LINUX_NILFS_FS_H
40
41#include <linux/types.h>
42#include <linux/ioctl.h>
4d3cf1bc 43#include <linux/magic.h>
187f1882 44#include <linux/bug.h>
eed10e39 45
eed10e39
KS		 46
47#define NILFS_INODE_BMAP_SIZE 7
48/**
49 * struct nilfs_inode - structure of an inode on disk
50 * @i_blocks: blocks count
51 * @i_size: size in bytes
61239230
RK		 52 * @i_ctime: creation time (seconds)
53 * @i_mtime: modification time (seconds)
54 * @i_ctime_nsec: creation time (nano seconds)
55 * @i_mtime_nsec: modification time (nano seconds)
eed10e39
KS		 56 * @i_uid: user id
57 * @i_gid: group id
58 * @i_mode: file mode
59 * @i_links_count: links count
60 * @i_flags: file flags
61 * @i_bmap: block mapping
62 * @i_xattr: extended attributes
63 * @i_generation: file generation (for NFS)
64 * @i_pad: padding
65 */
66struct nilfs_inode {
67 __le64 i_blocks;
68 __le64 i_size;
69 __le64 i_ctime;
70 __le64 i_mtime;
61239230
RK		 71 __le32 i_ctime_nsec;
72 __le32 i_mtime_nsec;
eed10e39
KS		 73 __le32 i_uid;
74 __le32 i_gid;
75 __le16 i_mode;
76 __le16 i_links_count;
77 __le32 i_flags;
78 __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
79#define i_device_code i_bmap[0]
80 __le64 i_xattr;
81 __le32 i_generation;
82 __le32 i_pad;
83};
84
85/**
86 * struct nilfs_super_root - structure of super root
87 * @sr_sum: check sum
88 * @sr_bytes: byte count of the structure
89 * @sr_flags: flags (reserved)
90 * @sr_nongc_ctime: write time of the last segment not for cleaner operation
91 * @sr_dat: DAT file inode
92 * @sr_cpfile: checkpoint file inode
93 * @sr_sufile: segment usage file inode
94 */
95struct nilfs_super_root {
96 __le32 sr_sum;
97 __le16 sr_bytes;
98 __le16 sr_flags;
99 __le64 sr_nongc_ctime;
100 struct nilfs_inode sr_dat;
101 struct nilfs_inode sr_cpfile;
102 struct nilfs_inode sr_sufile;
103};
104
105#define NILFS_SR_MDT_OFFSET(inode_size, i) \
106 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
107 (inode_size) * (i))
108#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
109#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
110#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
6c6de1aa 111#define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3)
eed10e39
KS		 112
113/*
114 * Maximal mount counts
115 */
116#define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
117
118/*
119 * File system states (sbp->s_state, nilfs->ns_mount_state)
120 */
121#define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
122#define NILFS_ERROR_FS 0x0002 /* Errors detected */
123#define NILFS_RESIZE_FS 0x0004 /* Resize required */
124
125/*
126 * Mount flags (sbi->s_mount_opt)
127 */
128#define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
129#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
130#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
131#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
eed10e39
KS		 132#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
133#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
134 semantics also for data */
0234576d
RK		 135#define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
136 mount-time recovery */
e902ec99 137#define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
eed10e39
KS		 138
139
140/**
141 * struct nilfs_super_block - structure of super block on disk
142 */
143struct nilfs_super_block {
2f1b7cd2 144/*00*/ __le32 s_rev_level; /* Revision level */
eed10e39
KS		 145 __le16 s_minor_rev_level; /* minor revision level */
146 __le16 s_magic; /* Magic signature */
147
148 __le16 s_bytes; /* Bytes count of CRC calculation
149 for this structure. s_reserved
150 is excluded. */
151 __le16 s_flags; /* flags */
152 __le32 s_crc_seed; /* Seed value of CRC calculation */
2f1b7cd2 153/*10*/ __le32 s_sum; /* Check sum of super block */
eed10e39
KS		 154
155 __le32 s_log_block_size; /* Block size represented as follows
156 blocksize =
157 1 << (s_log_block_size + 10) */
158 __le64 s_nsegments; /* Number of segments in filesystem */
2f1b7cd2 159/*20*/ __le64 s_dev_size; /* block device size in bytes */
eed10e39 160 __le64 s_first_data_block; /* 1st seg disk block number */
2f1b7cd2 161/*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
eed10e39
KS		 162 __le32 s_r_segments_percentage; /* Reserved segments percentage */
163
164 __le64 s_last_cno; /* Last checkpoint number */
2f1b7cd2 165/*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
eed10e39 166 __le64 s_last_seq; /* seq. number of seg written last */
2f1b7cd2 167/*50*/ __le64 s_free_blocks_count; /* Free blocks count */
eed10e39
KS		 168
169 __le64 s_ctime; /* Creation time (execution time of
170 newfs) */
2f1b7cd2 171/*60*/ __le64 s_mtime; /* Mount time */
eed10e39 172 __le64 s_wtime; /* Write time */
2f1b7cd2 173/*70*/ __le16 s_mnt_count; /* Mount count */
eed10e39
KS		 174 __le16 s_max_mnt_count; /* Maximal mount count */
175 __le16 s_state; /* File system state */
176 __le16 s_errors; /* Behaviour when detecting errors */
177 __le64 s_lastcheck; /* time of last check */
178
2f1b7cd2 179/*80*/ __le32 s_checkinterval; /* max. time between checks */
eed10e39
KS		 180 __le32 s_creator_os; /* OS */
181 __le16 s_def_resuid; /* Default uid for reserved blocks */
182 __le16 s_def_resgid; /* Default gid for reserved blocks */
0d9cc233 183 __le32 s_first_ino; /* First non-reserved inode */
eed10e39 184
2f1b7cd2 185/*90*/ __le16 s_inode_size; /* Size of an inode */
eed10e39
KS		 186 __le16 s_dat_entry_size; /* Size of a dat entry */
187 __le16 s_checkpoint_size; /* Size of a checkpoint */
188 __le16 s_segment_usage_size; /* Size of a segment usage */
189
2f1b7cd2
RK		 190/*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
191/*A8*/ char s_volume_name[80]; /* volume name */
eed10e39 192
2f1b7cd2 193/*F8*/ __le32 s_c_interval; /* Commit interval of segment */
eed10e39
KS		 194 __le32 s_c_block_max; /* Threshold of data amount for
195 the segment construction */
1a80a176
RK		 196/*100*/ __le64 s_feature_compat; /* Compatible feature set */
197 __le64 s_feature_compat_ro; /* Read-only compatible feature set */
198 __le64 s_feature_incompat; /* Incompatible feature set */
199 __u32 s_reserved[186]; /* padding to the end of the block */
eed10e39
KS		 200};
201
202/*
203 * Codes for operating systems
204 */
205#define NILFS_OS_LINUX 0
206/* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
207
208/*
209 * Revision levels
210 */
211#define NILFS_CURRENT_REV 2 /* current major revision */
212#define NILFS_MINOR_REV 0 /* minor revision */
9566a7a8 213#define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
eed10e39 214
1a80a176
RK		 215/*
216 * Feature set definitions
217 *
218 * If there is a bit set in the incompatible feature set that the kernel
219 * doesn't know about, it should refuse to mount the filesystem.
220 */
be667377
RK		 221#define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL
222
1a80a176 223#define NILFS_FEATURE_COMPAT_SUPP 0ULL
be667377 224#define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
1a80a176
RK		 225#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
226
eed10e39
KS		 227/*
228 * Bytes count of super_block for CRC-calculation
229 */
230#define NILFS_SB_BYTES \
231 ((long)&((struct nilfs_super_block *)0)->s_reserved)
232
233/*
234 * Special inode number
235 */
236#define NILFS_ROOT_INO 2 /* Root file inode */
237#define NILFS_DAT_INO 3 /* DAT file */
238#define NILFS_CPFILE_INO 4 /* checkpoint file */
239#define NILFS_SUFILE_INO 5 /* segment usage file */
240#define NILFS_IFILE_INO 6 /* ifile */
241#define NILFS_ATIME_INO 7 /* Atime file (reserved) */
242#define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
243#define NILFS_SKETCH_INO 10 /* Sketch file */
244#define NILFS_USER_INO 11 /* Fisrt user's file inode number */
245
246#define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
eed10e39
KS		 247
248#define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
249 a full segment */
250#define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
251 a partial segment */
252#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
253 segments */
254
6c43f410
RK		 255/*
256 * We call DAT, cpfile, and sufile root metadata files. Inodes of
257 * these files are written in super root block instead of ifile, and
258 * garbage collector doesn't keep any past versions of these files.
259 */
260#define NILFS_ROOT_METADATA_FILE(ino) \
261 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
262
e339ad31
RK		 263/*
264 * bytes offset of secondary super block
265 */
266#define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
eed10e39
KS		 267
268/*
269 * Maximal count of links to a file
270 */
271#define NILFS_LINK_MAX 32000
272
273/*
274 * Structure of a directory entry
275 * (Same as ext2)
276 */
277
278#define NILFS_NAME_LEN 255
279
89c0fd01
RK		 280/*
281 * Block size limitations
282 */
283#define NILFS_MIN_BLOCK_SIZE 1024
284#define NILFS_MAX_BLOCK_SIZE 65536
285
eed10e39
KS		 286/*
287 * The new version of the directory entry. Since V0 structures are
288 * stored in intel byte order, and the name_len field could never be
289 * bigger than 255 chars, it's safe to reclaim the extra byte for the
290 * file_type field.
291 */
292struct nilfs_dir_entry {
293 __le64 inode; /* Inode number */
294 __le16 rec_len; /* Directory entry length */
295 __u8 name_len; /* Name length */
8c74ac05 296 __u8 file_type; /* Dir entry type (file, dir, etc) */
eed10e39
KS		 297 char name[NILFS_NAME_LEN]; /* File name */
298 char pad;
299};
300
301/*
302 * NILFS directory file types. Only the low 3 bits are used. The
303 * other bits are reserved for now.
304 */
305enum {
306 NILFS_FT_UNKNOWN,
307 NILFS_FT_REG_FILE,
308 NILFS_FT_DIR,
309 NILFS_FT_CHRDEV,
310 NILFS_FT_BLKDEV,
311 NILFS_FT_FIFO,
312 NILFS_FT_SOCK,
313 NILFS_FT_SYMLINK,
314 NILFS_FT_MAX
315};
316
317/*
318 * NILFS_DIR_PAD defines the directory entries boundaries
319 *
320 * NOTE: It must be a multiple of 8
321 */
322#define NILFS_DIR_PAD 8
323#define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
324#define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
325 ~NILFS_DIR_ROUND)
6cda9fa2
RK		 326#define NILFS_MAX_REC_LEN ((1<<16)-1)
327
328static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
329{
330 unsigned len = le16_to_cpu(dlen);
331
ae191838 332#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
6cda9fa2
RK		 333 if (len == NILFS_MAX_REC_LEN)
334 return 1 << 16;
ae191838 335#endif
6cda9fa2
RK		 336 return len;
337}
338
339static inline __le16 nilfs_rec_len_to_disk(unsigned len)
340{
ae191838 341#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
6cda9fa2
RK		 342 if (len == (1 << 16))
343 return cpu_to_le16(NILFS_MAX_REC_LEN);
344 else if (len > (1 << 16))
345 BUG();
ae191838 346#endif
6cda9fa2
RK		 347 return cpu_to_le16(len);
348}
eed10e39
KS		 349
350/**
351 * struct nilfs_finfo - file information
352 * @fi_ino: inode number
353 * @fi_cno: checkpoint number
354 * @fi_nblocks: number of blocks (including intermediate blocks)
355 * @fi_ndatablk: number of file data blocks
356 */
357struct nilfs_finfo {
358 __le64 fi_ino;
359 __le64 fi_cno;
360 __le32 fi_nblocks;
361 __le32 fi_ndatablk;
362 /* array of virtual block numbers */
363};
364
365/**
366 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
367 * @bi_vblocknr: virtual block number
368 * @bi_blkoff: block offset
369 */
370struct nilfs_binfo_v {
371 __le64 bi_vblocknr;
372 __le64 bi_blkoff;
373};
374
375/**
376 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
377 * @bi_blkoff: block offset
378 * @bi_level: level
379 * @bi_pad: padding
380 */
381struct nilfs_binfo_dat {
382 __le64 bi_blkoff;
383 __u8 bi_level;
384 __u8 bi_pad[7];
385};
386
387/**
388 * union nilfs_binfo: block information
389 * @bi_v: nilfs_binfo_v structure
390 * @bi_dat: nilfs_binfo_dat structure
391 */
392union nilfs_binfo {
393 struct nilfs_binfo_v bi_v;
394 struct nilfs_binfo_dat bi_dat;
395};
396
397/**
8c74ac05 398 * struct nilfs_segment_summary - segment summary header
eed10e39
KS		 399 * @ss_datasum: checksum of data
400 * @ss_sumsum: checksum of segment summary
401 * @ss_magic: magic number
402 * @ss_bytes: size of this structure in bytes
403 * @ss_flags: flags
404 * @ss_seq: sequence number
405 * @ss_create: creation timestamp
406 * @ss_next: next segment
407 * @ss_nblocks: number of blocks
408 * @ss_nfinfo: number of finfo structures
409 * @ss_sumbytes: total size of segment summary in bytes
410 * @ss_pad: padding
50614bcf 411 * @ss_cno: checkpoint number
eed10e39
KS		 412 */
413struct nilfs_segment_summary {
414 __le32 ss_datasum;
415 __le32 ss_sumsum;
416 __le32 ss_magic;
417 __le16 ss_bytes;
418 __le16 ss_flags;
419 __le64 ss_seq;
420 __le64 ss_create;
421 __le64 ss_next;
422 __le32 ss_nblocks;
423 __le32 ss_nfinfo;
424 __le32 ss_sumbytes;
425 __le32 ss_pad;
50614bcf 426 __le64 ss_cno;
eed10e39
KS		 427 /* array of finfo structures */
428};
429
430#define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
431
432/*
433 * Segment summary flags
434 */
435#define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
436#define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
437#define NILFS_SS_SR 0x0004 /* has super root */
438#define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
439#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
440
6600b9dd
JS		 441/**
442 * struct nilfs_btree_node - B-tree node
443 * @bn_flags: flags
444 * @bn_level: level
445 * @bn_nchildren: number of children
446 * @bn_pad: padding
447 */
448struct nilfs_btree_node {
449 __u8 bn_flags;
450 __u8 bn_level;
451 __le16 bn_nchildren;
452 __le32 bn_pad;
453};
454
455/* flags */
456#define NILFS_BTREE_NODE_ROOT 0x01
457
458/* level */
459#define NILFS_BTREE_LEVEL_DATA 0
460#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
461#define NILFS_BTREE_LEVEL_MAX 14
462
eed10e39
KS		 463/**
464 * struct nilfs_palloc_group_desc - block group descriptor
465 * @pg_nfrees: number of free entries in block group
466 */
467struct nilfs_palloc_group_desc {
468 __le32 pg_nfrees;
469};
470
471/**
472 * struct nilfs_dat_entry - disk address translation entry
37e11f33
QF		 473 * @de_blocknr: block number
474 * @de_start: start checkpoint number
475 * @de_end: end checkpoint number
476 * @de_rsv: reserved for future use
eed10e39
KS		 477 */
478struct nilfs_dat_entry {
479 __le64 de_blocknr;
480 __le64 de_start;
481 __le64 de_end;
482 __le64 de_rsv;
483};
484
eed10e39
KS		 485/**
486 * struct nilfs_snapshot_list - snapshot list
487 * @ssl_next: next checkpoint number on snapshot list
488 * @ssl_prev: previous checkpoint number on snapshot list
489 */
490struct nilfs_snapshot_list {
491 __le64 ssl_next;
492 __le64 ssl_prev;
493};
494
495/**
496 * struct nilfs_checkpoint - checkpoint structure
497 * @cp_flags: flags
498 * @cp_checkpoints_count: checkpoints count in a block
499 * @cp_snapshot_list: snapshot list
500 * @cp_cno: checkpoint number
501 * @cp_create: creation timestamp
502 * @cp_nblk_inc: number of blocks incremented by this checkpoint
503 * @cp_inodes_count: inodes count
504 * @cp_blocks_count: blocks count
505 * @cp_ifile_inode: inode of ifile
506 */
507struct nilfs_checkpoint {
508 __le32 cp_flags;
509 __le32 cp_checkpoints_count;
510 struct nilfs_snapshot_list cp_snapshot_list;
511 __le64 cp_cno;
512 __le64 cp_create;
513 __le64 cp_nblk_inc;
514 __le64 cp_inodes_count;
be667377 515 __le64 cp_blocks_count;
eed10e39
KS		 516
517 /* Do not change the byte offset of ifile inode.
518 To keep the compatibility of the disk format,
519 additional fields should be added behind cp_ifile_inode. */
520 struct nilfs_inode cp_ifile_inode;
521};
522
523/* checkpoint flags */
524enum {
525 NILFS_CHECKPOINT_SNAPSHOT,
526 NILFS_CHECKPOINT_INVALID,
527 NILFS_CHECKPOINT_SKETCH,
c96fa464 528 NILFS_CHECKPOINT_MINOR,
eed10e39
KS		 529};
530
531#define NILFS_CHECKPOINT_FNS(flag, name) \
532static inline void \
533nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
534{ \
535 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
536 (1UL << NILFS_CHECKPOINT_##flag)); \
537} \
538static inline void \
539nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
540{ \
541 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
542 ~(1UL << NILFS_CHECKPOINT_##flag)); \
543} \
544static inline int \
545nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
546{ \
547 return !!(le32_to_cpu(cp->cp_flags) & \
548 (1UL << NILFS_CHECKPOINT_##flag)); \
549}
550
551NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
552NILFS_CHECKPOINT_FNS(INVALID, invalid)
c96fa464 553NILFS_CHECKPOINT_FNS(MINOR, minor)
eed10e39
KS		 554
555/**
556 * struct nilfs_cpinfo - checkpoint information
557 * @ci_flags: flags
dc498d09 558 * @ci_pad: padding
eed10e39
KS		 559 * @ci_cno: checkpoint number
560 * @ci_create: creation timestamp
561 * @ci_nblk_inc: number of blocks incremented by this checkpoint
562 * @ci_inodes_count: inodes count
563 * @ci_blocks_count: blocks count
564 * @ci_next: next checkpoint number in snapshot list
565 */
566struct nilfs_cpinfo {
567 __u32 ci_flags;
dc498d09 568 __u32 ci_pad;
eed10e39
KS		 569 __u64 ci_cno;
570 __u64 ci_create;
571 __u64 ci_nblk_inc;
572 __u64 ci_inodes_count;
573 __u64 ci_blocks_count;
574 __u64 ci_next;
575};
576
577#define NILFS_CPINFO_FNS(flag, name) \
578static inline int \
579nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
580{ \
581 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
582}
583
584NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
585NILFS_CPINFO_FNS(INVALID, invalid)
c96fa464 586NILFS_CPINFO_FNS(MINOR, minor)
eed10e39
KS		 587
588
589/**
590 * struct nilfs_cpfile_header - checkpoint file header
591 * @ch_ncheckpoints: number of checkpoints
592 * @ch_nsnapshots: number of snapshots
593 * @ch_snapshot_list: snapshot list
594 */
595struct nilfs_cpfile_header {
596 __le64 ch_ncheckpoints;
597 __le64 ch_nsnapshots;
598 struct nilfs_snapshot_list ch_snapshot_list;
599};
600
601#define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
602 ((sizeof(struct nilfs_cpfile_header) + \
603 sizeof(struct nilfs_checkpoint) - 1) / \
604 sizeof(struct nilfs_checkpoint))
605
606/**
607 * struct nilfs_segment_usage - segment usage
608 * @su_lastmod: last modified timestamp
609 * @su_nblocks: number of blocks in segment
610 * @su_flags: flags
611 */
612struct nilfs_segment_usage {
613 __le64 su_lastmod;
614 __le32 su_nblocks;
615 __le32 su_flags;
616};
617
618/* segment usage flag */
619enum {
620 NILFS_SEGMENT_USAGE_ACTIVE,
621 NILFS_SEGMENT_USAGE_DIRTY,
622 NILFS_SEGMENT_USAGE_ERROR,
623
eed10e39
KS		 624 /* ... */
625};
626
627#define NILFS_SEGMENT_USAGE_FNS(flag, name) \
628static inline void \
629nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
630{ \
631 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
632 (1UL << NILFS_SEGMENT_USAGE_##flag));\
633} \
634static inline void \
635nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
636{ \
637 su->su_flags = \
638 cpu_to_le32(le32_to_cpu(su->su_flags) & \
639 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
640} \
641static inline int \
642nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
643{ \
644 return !!(le32_to_cpu(su->su_flags) & \
645 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
646}
647
648NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
649NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
650NILFS_SEGMENT_USAGE_FNS(ERROR, error)
eed10e39
KS		 651
652static inline void
653nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
654{
655 su->su_lastmod = cpu_to_le64(0);
656 su->su_nblocks = cpu_to_le32(0);
657 su->su_flags = cpu_to_le32(0);
658}
659
660static inline int
661nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
662{
663 return !le32_to_cpu(su->su_flags);
664}
665
666/**
667 * struct nilfs_sufile_header - segment usage file header
668 * @sh_ncleansegs: number of clean segments
669 * @sh_ndirtysegs: number of dirty segments
670 * @sh_last_alloc: last allocated segment number
671 */
672struct nilfs_sufile_header {
673 __le64 sh_ncleansegs;
674 __le64 sh_ndirtysegs;
675 __le64 sh_last_alloc;
676 /* ... */
677};
678
679#define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
680 ((sizeof(struct nilfs_sufile_header) + \
681 sizeof(struct nilfs_segment_usage) - 1) / \
682 sizeof(struct nilfs_segment_usage))
683
684/**
685 * nilfs_suinfo - segment usage information
8c74ac05
VD		 686 * @sui_lastmod: timestamp of last modification
687 * @sui_nblocks: number of written blocks in segment
688 * @sui_flags: segment usage flags
eed10e39
KS		 689 */
690struct nilfs_suinfo {
691 __u64 sui_lastmod;
692 __u32 sui_nblocks;
693 __u32 sui_flags;
694};
695
696#define NILFS_SUINFO_FNS(flag, name) \
697static inline int \
698nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
699{ \
700 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
701}
702
703NILFS_SUINFO_FNS(ACTIVE, active)
704NILFS_SUINFO_FNS(DIRTY, dirty)
705NILFS_SUINFO_FNS(ERROR, error)
eed10e39
KS		 706
707static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
708{
709 return !si->sui_flags;
710}
711
712/* ioctl */
713enum {
714 NILFS_CHECKPOINT,
715 NILFS_SNAPSHOT,
716};
717
718/**
8c74ac05
VD		 719 * struct nilfs_cpmode - change checkpoint mode structure
720 * @cm_cno: checkpoint number
721 * @cm_mode: mode of checkpoint
722 * @cm_pad: padding
eed10e39
KS		 723 */
724struct nilfs_cpmode {
725 __u64 cm_cno;
dc498d09
RK		 726 __u32 cm_mode;
727 __u32 cm_pad;
eed10e39
KS		 728};
729
730/**
731 * struct nilfs_argv - argument vector
8c74ac05
VD		 732 * @v_base: pointer on data array from userspace
733 * @v_nmembs: number of members in data array
734 * @v_size: size of data array in bytes
735 * @v_flags: flags
736 * @v_index: start number of target data items
eed10e39
KS		 737 */
738struct nilfs_argv {
dc498d09
RK		 739 __u64 v_base;
740 __u32 v_nmembs; /* number of members */
741 __u16 v_size; /* size of members */
742 __u16 v_flags;
743 __u64 v_index;
eed10e39
KS		 744};
745
746/**
8c74ac05
VD		 747 * struct nilfs_period - period of checkpoint numbers
748 * @p_start: start checkpoint number (inclusive)
749 * @p_end: end checkpoint number (exclusive)
eed10e39
KS		 750 */
751struct nilfs_period {
752 __u64 p_start;
753 __u64 p_end;
754};
755
756/**
8c74ac05 757 * struct nilfs_cpstat - checkpoint statistics
eed10e39
KS		 758 * @cs_cno: checkpoint number
759 * @cs_ncps: number of checkpoints
760 * @cs_nsss: number of snapshots
761 */
762struct nilfs_cpstat {
763 __u64 cs_cno;
764 __u64 cs_ncps;
765 __u64 cs_nsss;
766};
767
768/**
8c74ac05 769 * struct nilfs_sustat - segment usage statistics
eed10e39
KS		 770 * @ss_nsegs: number of segments
771 * @ss_ncleansegs: number of clean segments
772 * @ss_ndirtysegs: number of dirty segments
2c2e52fc
RK		 773 * @ss_ctime: creation time of the last segment
774 * @ss_nongc_ctime: creation time of the last segment not for GC
775 * @ss_prot_seq: least sequence number of segments which must not be reclaimed
eed10e39
KS		 776 */
777struct nilfs_sustat {
778 __u64 ss_nsegs;
779 __u64 ss_ncleansegs;
780 __u64 ss_ndirtysegs;
dc498d09
RK		 781 __u64 ss_ctime;
782 __u64 ss_nongc_ctime;
2c2e52fc 783 __u64 ss_prot_seq;
eed10e39
KS		 784};
785
786/**
787 * struct nilfs_vinfo - virtual block number information
8c74ac05
VD		 788 * @vi_vblocknr: virtual block number
789 * @vi_start: start checkpoint number (inclusive)
790 * @vi_end: end checkpoint number (exclusive)
791 * @vi_blocknr: disk block number
eed10e39
KS		 792 */
793struct nilfs_vinfo {
794 __u64 vi_vblocknr;
795 __u64 vi_start;
796 __u64 vi_end;
797 __u64 vi_blocknr;
798};
799
800/**
8c74ac05
VD		 801 * struct nilfs_vdesc - descriptor of virtual block number
802 * @vd_ino: inode number
803 * @vd_cno: checkpoint number
804 * @vd_vblocknr: virtual block number
805 * @vd_period: period of checkpoint numbers
806 * @vd_blocknr: disk block number
807 * @vd_offset: logical block offset inside a file
808 * @vd_flags: flags (data or node block)
809 * @vd_pad: padding
eed10e39
KS		 810 */
811struct nilfs_vdesc {
812 __u64 vd_ino;
813 __u64 vd_cno;
814 __u64 vd_vblocknr;
815 struct nilfs_period vd_period;
816 __u64 vd_blocknr;
817 __u64 vd_offset;
818 __u32 vd_flags;
dc498d09 819 __u32 vd_pad;
eed10e39
KS		 820};
821
822/**
8c74ac05
VD		 823 * struct nilfs_bdesc - descriptor of disk block number
824 * @bd_ino: inode number
825 * @bd_oblocknr: disk block address (for skipping dead blocks)
826 * @bd_blocknr: disk block address
827 * @bd_offset: logical block offset inside a file
828 * @bd_level: level in the b-tree organization
829 * @bd_pad: padding
eed10e39
KS		 830 */
831struct nilfs_bdesc {
832 __u64 bd_ino;
833 __u64 bd_oblocknr;
834 __u64 bd_blocknr;
835 __u64 bd_offset;
836 __u32 bd_level;
dc498d09 837 __u32 bd_pad;
eed10e39
KS		 838};
839
eed10e39
KS		 840#define NILFS_IOCTL_IDENT 'n'
841
842#define NILFS_IOCTL_CHANGE_CPMODE \
843 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
844#define NILFS_IOCTL_DELETE_CHECKPOINT \
845 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
846#define NILFS_IOCTL_GET_CPINFO \
847 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
848#define NILFS_IOCTL_GET_CPSTAT \
849 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
850#define NILFS_IOCTL_GET_SUINFO \
851 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
852#define NILFS_IOCTL_GET_SUSTAT \
853 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
854#define NILFS_IOCTL_GET_VINFO \
855 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
856#define NILFS_IOCTL_GET_BDESCS \
857 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
858#define NILFS_IOCTL_CLEAN_SEGMENTS \
859 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
eed10e39
KS		 860#define NILFS_IOCTL_SYNC \
861 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
862#define NILFS_IOCTL_RESIZE \
863 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
619205da
RK		 864#define NILFS_IOCTL_SET_ALLOC_RANGE \
865 _IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
eed10e39 866
eed10e39 867#endif /* _LINUX_NILFS_FS_H */
kernel source for telekom puls (alcatel/mediatek)