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20#ifndef _THE_NILFS_H
21#define _THE_NILFS_H
22
23#include <linux/types.h>
24#include <linux/buffer_head.h>
25#include <linux/rbtree.h>
26#include <linux/fs.h>
27#include <linux/blkdev.h>
28#include <linux/backing-dev.h>
29#include <linux/slab.h>
30
31struct nilfs_sc_info;
32struct nilfs_sysfs_dev_subgroups;
33
34
35enum {
36 THE_NILFS_INIT = 0,
37 THE_NILFS_DISCONTINUED,
38 THE_NILFS_GC_RUNNING,
39 THE_NILFS_SB_DIRTY,
40};
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102struct the_nilfs {
103 unsigned long ns_flags;
104 int ns_flushed_device;
105
106 struct super_block *ns_sb;
107 struct block_device *ns_bdev;
108 struct rw_semaphore ns_sem;
109 struct mutex ns_snapshot_mount_mutex;
110
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116 struct buffer_head *ns_sbh[2];
117 struct nilfs_super_block *ns_sbp[2];
118 time_t ns_sbwtime;
119 unsigned int ns_sbwcount;
120 unsigned int ns_sbsize;
121 unsigned int ns_mount_state;
122 unsigned int ns_sb_update_freq;
123
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127
128 u64 ns_seg_seq;
129 __u64 ns_segnum;
130 __u64 ns_nextnum;
131 unsigned long ns_pseg_offset;
132 __u64 ns_cno;
133 time_t ns_ctime;
134 time_t ns_nongc_ctime;
135 atomic_t ns_ndirtyblks;
136
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141
142 spinlock_t ns_last_segment_lock;
143 sector_t ns_last_pseg;
144 u64 ns_last_seq;
145 __u64 ns_last_cno;
146 u64 ns_prot_seq;
147 u64 ns_prev_seq;
148
149 struct nilfs_sc_info *ns_writer;
150 struct rw_semaphore ns_segctor_sem;
151
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156 struct inode *ns_dat;
157 struct inode *ns_cpfile;
158 struct inode *ns_sufile;
159
160
161 struct rb_root ns_cptree;
162 spinlock_t ns_cptree_lock;
163
164
165 struct list_head ns_dirty_files;
166 spinlock_t ns_inode_lock;
167
168
169 struct list_head ns_gc_inodes;
170
171
172 u32 ns_next_generation;
173 spinlock_t ns_next_gen_lock;
174
175
176 unsigned long ns_mount_opt;
177
178 uid_t ns_resuid;
179 gid_t ns_resgid;
180 unsigned long ns_interval;
181 unsigned long ns_watermark;
182
183
184 unsigned int ns_blocksize_bits;
185 unsigned int ns_blocksize;
186 unsigned long ns_nsegments;
187 unsigned long ns_blocks_per_segment;
188 unsigned long ns_r_segments_percentage;
189 unsigned long ns_nrsvsegs;
190 unsigned long ns_first_data_block;
191 int ns_inode_size;
192 int ns_first_ino;
193 u32 ns_crc_seed;
194
195
196 struct kobject ns_dev_kobj;
197 struct completion ns_dev_kobj_unregister;
198 struct nilfs_sysfs_dev_subgroups *ns_dev_subgroups;
199};
200
201#define THE_NILFS_FNS(bit, name) \
202static inline void set_nilfs_##name(struct the_nilfs *nilfs) \
203{ \
204 set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
205} \
206static inline void clear_nilfs_##name(struct the_nilfs *nilfs) \
207{ \
208 clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
209} \
210static inline int nilfs_##name(struct the_nilfs *nilfs) \
211{ \
212 return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
213}
214
215THE_NILFS_FNS(INIT, init)
216THE_NILFS_FNS(DISCONTINUED, discontinued)
217THE_NILFS_FNS(GC_RUNNING, gc_running)
218THE_NILFS_FNS(SB_DIRTY, sb_dirty)
219
220
221
222
223#define nilfs_clear_opt(nilfs, opt) \
224 ((nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt)
225#define nilfs_set_opt(nilfs, opt) \
226 ((nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt)
227#define nilfs_test_opt(nilfs, opt) ((nilfs)->ns_mount_opt & NILFS_MOUNT_##opt)
228#define nilfs_write_opt(nilfs, mask, opt) \
229 ((nilfs)->ns_mount_opt = \
230 (((nilfs)->ns_mount_opt & ~NILFS_MOUNT_##mask) | \
231 NILFS_MOUNT_##opt)) \
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245struct nilfs_root {
246 __u64 cno;
247 struct rb_node rb_node;
248
249 atomic_t count;
250 struct the_nilfs *nilfs;
251 struct inode *ifile;
252
253 atomic64_t inodes_count;
254 atomic64_t blocks_count;
255
256
257 struct kobject snapshot_kobj;
258 struct completion snapshot_kobj_unregister;
259};
260
261
262#define NILFS_CPTREE_CURRENT_CNO 0
263
264
265#define NILFS_SB_FREQ 10
266
267static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
268{
269 u64 t = get_seconds();
270
271 return t < nilfs->ns_sbwtime ||
272 t > nilfs->ns_sbwtime + nilfs->ns_sb_update_freq;
273}
274
275static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs)
276{
277 int flip_bits = nilfs->ns_sbwcount & 0x0FL;
278
279 return (flip_bits != 0x08 && flip_bits != 0x0F);
280}
281
282void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
283struct the_nilfs *alloc_nilfs(struct super_block *sb);
284void destroy_nilfs(struct the_nilfs *nilfs);
285int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data);
286int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb);
287unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs);
288void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs);
289int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t);
290int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
291struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno);
292struct nilfs_root *nilfs_find_or_create_root(struct the_nilfs *nilfs,
293 __u64 cno);
294void nilfs_put_root(struct nilfs_root *root);
295int nilfs_near_disk_full(struct the_nilfs *);
296void nilfs_fall_back_super_block(struct the_nilfs *);
297void nilfs_swap_super_block(struct the_nilfs *);
298
299
300static inline void nilfs_get_root(struct nilfs_root *root)
301{
302 atomic_inc(&root->count);
303}
304
305static inline int nilfs_valid_fs(struct the_nilfs *nilfs)
306{
307 unsigned int valid_fs;
308
309 down_read(&nilfs->ns_sem);
310 valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);
311 up_read(&nilfs->ns_sem);
312 return valid_fs;
313}
314
315static inline void
316nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum,
317 sector_t *seg_start, sector_t *seg_end)
318{
319 *seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum;
320 *seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1;
321 if (segnum == 0)
322 *seg_start = nilfs->ns_first_data_block;
323}
324
325static inline sector_t
326nilfs_get_segment_start_blocknr(struct the_nilfs *nilfs, __u64 segnum)
327{
328 return (segnum == 0) ? nilfs->ns_first_data_block :
329 (sector_t)nilfs->ns_blocks_per_segment * segnum;
330}
331
332static inline __u64
333nilfs_get_segnum_of_block(struct the_nilfs *nilfs, sector_t blocknr)
334{
335 sector_t segnum = blocknr;
336
337 sector_div(segnum, nilfs->ns_blocks_per_segment);
338 return segnum;
339}
340
341static inline void
342nilfs_terminate_segment(struct the_nilfs *nilfs, sector_t seg_start,
343 sector_t seg_end)
344{
345
346 nilfs->ns_pseg_offset = seg_end - seg_start + 1;
347}
348
349static inline void nilfs_shift_to_next_segment(struct the_nilfs *nilfs)
350{
351
352 nilfs->ns_segnum = nilfs->ns_nextnum;
353 nilfs->ns_pseg_offset = 0;
354 nilfs->ns_seg_seq++;
355}
356
357static inline __u64 nilfs_last_cno(struct the_nilfs *nilfs)
358{
359 __u64 cno;
360
361 spin_lock(&nilfs->ns_last_segment_lock);
362 cno = nilfs->ns_last_cno;
363 spin_unlock(&nilfs->ns_last_segment_lock);
364 return cno;
365}
366
367static inline int nilfs_segment_is_active(struct the_nilfs *nilfs, __u64 n)
368{
369 return n == nilfs->ns_segnum || n == nilfs->ns_nextnum;
370}
371
372static inline int nilfs_flush_device(struct the_nilfs *nilfs)
373{
374 int err;
375
376 if (!nilfs_test_opt(nilfs, BARRIER) || nilfs->ns_flushed_device)
377 return 0;
378
379 nilfs->ns_flushed_device = 1;
380
381
382
383
384 smp_wmb();
385
386 err = blkdev_issue_flush(nilfs->ns_bdev, GFP_KERNEL, NULL);
387 if (err != -EIO)
388 err = 0;
389 return err;
390}
391
392#endif
393