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24#ifndef _THE_NILFS_H
25#define _THE_NILFS_H
26
27#include <linux/types.h>
28#include <linux/buffer_head.h>
29#include <linux/rbtree.h>
30#include <linux/fs.h>
31#include <linux/blkdev.h>
32#include <linux/backing-dev.h>
33#include <linux/slab.h>
34
35struct nilfs_sc_info;
36
37
38enum {
39 THE_NILFS_INIT = 0,
40 THE_NILFS_DISCONTINUED,
41 THE_NILFS_GC_RUNNING,
42 THE_NILFS_SB_DIRTY,
43};
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99struct the_nilfs {
100 unsigned long ns_flags;
101
102 struct block_device *ns_bdev;
103 struct rw_semaphore ns_sem;
104 struct mutex ns_snapshot_mount_mutex;
105
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111 struct buffer_head *ns_sbh[2];
112 struct nilfs_super_block *ns_sbp[2];
113 time_t ns_sbwtime;
114 unsigned ns_sbwcount;
115 unsigned ns_sbsize;
116 unsigned ns_mount_state;
117
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124
125 u64 ns_seg_seq;
126 __u64 ns_segnum;
127 __u64 ns_nextnum;
128 unsigned long ns_pseg_offset;
129 __u64 ns_cno;
130 time_t ns_ctime;
131 time_t ns_nongc_ctime;
132 atomic_t ns_ndirtyblks;
133
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138
139 spinlock_t ns_last_segment_lock;
140 sector_t ns_last_pseg;
141 u64 ns_last_seq;
142 __u64 ns_last_cno;
143 u64 ns_prot_seq;
144 u64 ns_prev_seq;
145
146 struct nilfs_sc_info *ns_writer;
147 struct rw_semaphore ns_segctor_sem;
148
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151
152
153 struct inode *ns_dat;
154 struct inode *ns_cpfile;
155 struct inode *ns_sufile;
156
157
158 struct rb_root ns_cptree;
159 spinlock_t ns_cptree_lock;
160
161
162 struct list_head ns_dirty_files;
163 spinlock_t ns_inode_lock;
164
165
166 struct list_head ns_gc_inodes;
167
168
169 u32 ns_next_generation;
170 spinlock_t ns_next_gen_lock;
171
172
173 unsigned long ns_mount_opt;
174
175 uid_t ns_resuid;
176 gid_t ns_resgid;
177 unsigned long ns_interval;
178 unsigned long ns_watermark;
179
180
181 unsigned int ns_blocksize_bits;
182 unsigned int ns_blocksize;
183 unsigned long ns_nsegments;
184 unsigned long ns_blocks_per_segment;
185 unsigned long ns_r_segments_percentage;
186 unsigned long ns_nrsvsegs;
187 unsigned long ns_first_data_block;
188 int ns_inode_size;
189 int ns_first_ino;
190 u32 ns_crc_seed;
191};
192
193#define THE_NILFS_FNS(bit, name) \
194static inline void set_nilfs_##name(struct the_nilfs *nilfs) \
195{ \
196 set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
197} \
198static inline void clear_nilfs_##name(struct the_nilfs *nilfs) \
199{ \
200 clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
201} \
202static inline int nilfs_##name(struct the_nilfs *nilfs) \
203{ \
204 return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
205}
206
207THE_NILFS_FNS(INIT, init)
208THE_NILFS_FNS(DISCONTINUED, discontinued)
209THE_NILFS_FNS(GC_RUNNING, gc_running)
210THE_NILFS_FNS(SB_DIRTY, sb_dirty)
211
212
213
214
215#define nilfs_clear_opt(nilfs, opt) \
216 do { (nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt; } while (0)
217#define nilfs_set_opt(nilfs, opt) \
218 do { (nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt; } while (0)
219#define nilfs_test_opt(nilfs, opt) ((nilfs)->ns_mount_opt & NILFS_MOUNT_##opt)
220#define nilfs_write_opt(nilfs, mask, opt) \
221 do { (nilfs)->ns_mount_opt = \
222 (((nilfs)->ns_mount_opt & ~NILFS_MOUNT_##mask) | \
223 NILFS_MOUNT_##opt); \
224 } while (0)
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235
236struct nilfs_root {
237 __u64 cno;
238 struct rb_node rb_node;
239
240 atomic_t count;
241 struct the_nilfs *nilfs;
242 struct inode *ifile;
243
244 atomic64_t inodes_count;
245 atomic64_t blocks_count;
246};
247
248
249#define NILFS_CPTREE_CURRENT_CNO 0
250
251
252#define NILFS_SB_FREQ 10
253
254static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
255{
256 u64 t = get_seconds();
257 return t < nilfs->ns_sbwtime || t > nilfs->ns_sbwtime + NILFS_SB_FREQ;
258}
259
260static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)
261{
262 int flip_bits = nilfs->ns_sbwcount & 0x0FL;
263 return (flip_bits != 0x08 && flip_bits != 0x0F);
264}
265
266void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
267struct the_nilfs *alloc_nilfs(struct block_device *bdev);
268void destroy_nilfs(struct the_nilfs *nilfs);
269int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data);
270int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb);
271unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs);
272void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs);
273int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t);
274int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
275struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno);
276struct nilfs_root *nilfs_find_or_create_root(struct the_nilfs *nilfs,
277 __u64 cno);
278void nilfs_put_root(struct nilfs_root *root);
279int nilfs_near_disk_full(struct the_nilfs *);
280void nilfs_fall_back_super_block(struct the_nilfs *);
281void nilfs_swap_super_block(struct the_nilfs *);
282
283
284static inline void nilfs_get_root(struct nilfs_root *root)
285{
286 atomic_inc(&root->count);
287}
288
289static inline int nilfs_valid_fs(struct the_nilfs *nilfs)
290{
291 unsigned valid_fs;
292
293 down_read(&nilfs->ns_sem);
294 valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);
295 up_read(&nilfs->ns_sem);
296 return valid_fs;
297}
298
299static inline void
300nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum,
301 sector_t *seg_start, sector_t *seg_end)
302{
303 *seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum;
304 *seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1;
305 if (segnum == 0)
306 *seg_start = nilfs->ns_first_data_block;
307}
308
309static inline sector_t
310nilfs_get_segment_start_blocknr(struct the_nilfs *nilfs, __u64 segnum)
311{
312 return (segnum == 0) ? nilfs->ns_first_data_block :
313 (sector_t)nilfs->ns_blocks_per_segment * segnum;
314}
315
316static inline __u64
317nilfs_get_segnum_of_block(struct the_nilfs *nilfs, sector_t blocknr)
318{
319 sector_t segnum = blocknr;
320
321 sector_div(segnum, nilfs->ns_blocks_per_segment);
322 return segnum;
323}
324
325static inline void
326nilfs_terminate_segment(struct the_nilfs *nilfs, sector_t seg_start,
327 sector_t seg_end)
328{
329
330 nilfs->ns_pseg_offset = seg_end - seg_start + 1;
331}
332
333static inline void nilfs_shift_to_next_segment(struct the_nilfs *nilfs)
334{
335
336 nilfs->ns_segnum = nilfs->ns_nextnum;
337 nilfs->ns_pseg_offset = 0;
338 nilfs->ns_seg_seq++;
339}
340
341static inline __u64 nilfs_last_cno(struct the_nilfs *nilfs)
342{
343 __u64 cno;
344
345 spin_lock(&nilfs->ns_last_segment_lock);
346 cno = nilfs->ns_last_cno;
347 spin_unlock(&nilfs->ns_last_segment_lock);
348 return cno;
349}
350
351static inline int nilfs_segment_is_active(struct the_nilfs *nilfs, __u64 n)
352{
353 return n == nilfs->ns_segnum || n == nilfs->ns_nextnum;
354}
355
356#endif
357