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23#include <linux/errno.h>
24#include "nilfs.h"
25#include "page.h"
26#include "direct.h"
27#include "alloc.h"
28#include "dat.h"
29
30static inline __le64 *nilfs_direct_dptrs(const struct nilfs_bmap *direct)
31{
32 return (__le64 *)
33 ((struct nilfs_direct_node *)direct->b_u.u_data + 1);
34}
35
36static inline __u64
37nilfs_direct_get_ptr(const struct nilfs_bmap *direct, __u64 key)
38{
39 return le64_to_cpu(*(nilfs_direct_dptrs(direct) + key));
40}
41
42static inline void nilfs_direct_set_ptr(struct nilfs_bmap *direct,
43 __u64 key, __u64 ptr)
44{
45 *(nilfs_direct_dptrs(direct) + key) = cpu_to_le64(ptr);
46}
47
48static int nilfs_direct_lookup(const struct nilfs_bmap *direct,
49 __u64 key, int level, __u64 *ptrp)
50{
51 __u64 ptr;
52
53 if (key > NILFS_DIRECT_KEY_MAX || level != 1)
54 return -ENOENT;
55 ptr = nilfs_direct_get_ptr(direct, key);
56 if (ptr == NILFS_BMAP_INVALID_PTR)
57 return -ENOENT;
58
59 *ptrp = ptr;
60 return 0;
61}
62
63static int nilfs_direct_lookup_contig(const struct nilfs_bmap *direct,
64 __u64 key, __u64 *ptrp,
65 unsigned maxblocks)
66{
67 struct inode *dat = NULL;
68 __u64 ptr, ptr2;
69 sector_t blocknr;
70 int ret, cnt;
71
72 if (key > NILFS_DIRECT_KEY_MAX)
73 return -ENOENT;
74 ptr = nilfs_direct_get_ptr(direct, key);
75 if (ptr == NILFS_BMAP_INVALID_PTR)
76 return -ENOENT;
77
78 if (NILFS_BMAP_USE_VBN(direct)) {
79 dat = nilfs_bmap_get_dat(direct);
80 ret = nilfs_dat_translate(dat, ptr, &blocknr);
81 if (ret < 0)
82 return ret;
83 ptr = blocknr;
84 }
85
86 maxblocks = min_t(unsigned, maxblocks, NILFS_DIRECT_KEY_MAX - key + 1);
87 for (cnt = 1; cnt < maxblocks &&
88 (ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) !=
89 NILFS_BMAP_INVALID_PTR;
90 cnt++) {
91 if (dat) {
92 ret = nilfs_dat_translate(dat, ptr2, &blocknr);
93 if (ret < 0)
94 return ret;
95 ptr2 = blocknr;
96 }
97 if (ptr2 != ptr + cnt)
98 break;
99 }
100 *ptrp = ptr;
101 return cnt;
102}
103
104static __u64
105nilfs_direct_find_target_v(const struct nilfs_bmap *direct, __u64 key)
106{
107 __u64 ptr;
108
109 ptr = nilfs_bmap_find_target_seq(direct, key);
110 if (ptr != NILFS_BMAP_INVALID_PTR)
111
112 return ptr;
113 else
114
115 return nilfs_bmap_find_target_in_group(direct);
116}
117
118static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
119{
120 union nilfs_bmap_ptr_req req;
121 struct inode *dat = NULL;
122 struct buffer_head *bh;
123 int ret;
124
125 if (key > NILFS_DIRECT_KEY_MAX)
126 return -ENOENT;
127 if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
128 return -EEXIST;
129
130 if (NILFS_BMAP_USE_VBN(bmap)) {
131 req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
132 dat = nilfs_bmap_get_dat(bmap);
133 }
134 ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
135 if (!ret) {
136
137 bh = (struct buffer_head *)((unsigned long)ptr);
138 set_buffer_nilfs_volatile(bh);
139
140 nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
141 nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
142
143 if (!nilfs_bmap_dirty(bmap))
144 nilfs_bmap_set_dirty(bmap);
145
146 if (NILFS_BMAP_USE_VBN(bmap))
147 nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
148
149 nilfs_inode_add_blocks(bmap->b_inode, 1);
150 }
151 return ret;
152}
153
154static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
155{
156 union nilfs_bmap_ptr_req req;
157 struct inode *dat;
158 int ret;
159
160 if (key > NILFS_DIRECT_KEY_MAX ||
161 nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR)
162 return -ENOENT;
163
164 dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
165 req.bpr_ptr = nilfs_direct_get_ptr(bmap, key);
166
167 ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
168 if (!ret) {
169 nilfs_bmap_commit_end_ptr(bmap, &req, dat);
170 nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR);
171 nilfs_inode_sub_blocks(bmap->b_inode, 1);
172 }
173 return ret;
174}
175
176static int nilfs_direct_seek_key(const struct nilfs_bmap *direct, __u64 start,
177 __u64 *keyp)
178{
179 __u64 key;
180
181 for (key = start; key <= NILFS_DIRECT_KEY_MAX; key++) {
182 if (nilfs_direct_get_ptr(direct, key) !=
183 NILFS_BMAP_INVALID_PTR) {
184 *keyp = key;
185 return 0;
186 }
187 }
188 return -ENOENT;
189}
190
191static int nilfs_direct_last_key(const struct nilfs_bmap *direct, __u64 *keyp)
192{
193 __u64 key, lastkey;
194
195 lastkey = NILFS_DIRECT_KEY_MAX + 1;
196 for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
197 if (nilfs_direct_get_ptr(direct, key) !=
198 NILFS_BMAP_INVALID_PTR)
199 lastkey = key;
200
201 if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
202 return -ENOENT;
203
204 *keyp = lastkey;
205
206 return 0;
207}
208
209static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
210{
211 return key > NILFS_DIRECT_KEY_MAX;
212}
213
214static int nilfs_direct_gather_data(struct nilfs_bmap *direct,
215 __u64 *keys, __u64 *ptrs, int nitems)
216{
217 __u64 key;
218 __u64 ptr;
219 int n;
220
221 if (nitems > NILFS_DIRECT_NBLOCKS)
222 nitems = NILFS_DIRECT_NBLOCKS;
223 n = 0;
224 for (key = 0; key < nitems; key++) {
225 ptr = nilfs_direct_get_ptr(direct, key);
226 if (ptr != NILFS_BMAP_INVALID_PTR) {
227 keys[n] = key;
228 ptrs[n] = ptr;
229 n++;
230 }
231 }
232 return n;
233}
234
235int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
236 __u64 key, __u64 *keys, __u64 *ptrs, int n)
237{
238 __le64 *dptrs;
239 int ret, i, j;
240
241
242
243
244 ret = bmap->b_ops->bop_delete(bmap, key);
245 if (ret < 0)
246 return ret;
247
248
249 if (bmap->b_ops->bop_clear != NULL)
250 bmap->b_ops->bop_clear(bmap);
251
252
253 dptrs = nilfs_direct_dptrs(bmap);
254 for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
255 if ((j < n) && (i == keys[j])) {
256 dptrs[i] = (i != key) ?
257 cpu_to_le64(ptrs[j]) :
258 NILFS_BMAP_INVALID_PTR;
259 j++;
260 } else
261 dptrs[i] = NILFS_BMAP_INVALID_PTR;
262 }
263
264 nilfs_direct_init(bmap);
265 return 0;
266}
267
268static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
269 struct buffer_head *bh)
270{
271 struct nilfs_palloc_req oldreq, newreq;
272 struct inode *dat;
273 __u64 key;
274 __u64 ptr;
275 int ret;
276
277 if (!NILFS_BMAP_USE_VBN(bmap))
278 return 0;
279
280 dat = nilfs_bmap_get_dat(bmap);
281 key = nilfs_bmap_data_get_key(bmap, bh);
282 ptr = nilfs_direct_get_ptr(bmap, key);
283 if (!buffer_nilfs_volatile(bh)) {
284 oldreq.pr_entry_nr = ptr;
285 newreq.pr_entry_nr = ptr;
286 ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
287 if (ret < 0)
288 return ret;
289 nilfs_dat_commit_update(dat, &oldreq, &newreq,
290 bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
291 set_buffer_nilfs_volatile(bh);
292 nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
293 } else
294 ret = nilfs_dat_mark_dirty(dat, ptr);
295
296 return ret;
297}
298
299static int nilfs_direct_assign_v(struct nilfs_bmap *direct,
300 __u64 key, __u64 ptr,
301 struct buffer_head **bh,
302 sector_t blocknr,
303 union nilfs_binfo *binfo)
304{
305 struct inode *dat = nilfs_bmap_get_dat(direct);
306 union nilfs_bmap_ptr_req req;
307 int ret;
308
309 req.bpr_ptr = ptr;
310 ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
311 if (!ret) {
312 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
313 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
314 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
315 }
316 return ret;
317}
318
319static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
320 __u64 key, __u64 ptr,
321 struct buffer_head **bh,
322 sector_t blocknr,
323 union nilfs_binfo *binfo)
324{
325 nilfs_direct_set_ptr(direct, key, blocknr);
326
327 binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
328 binfo->bi_dat.bi_level = 0;
329
330 return 0;
331}
332
333static int nilfs_direct_assign(struct nilfs_bmap *bmap,
334 struct buffer_head **bh,
335 sector_t blocknr,
336 union nilfs_binfo *binfo)
337{
338 __u64 key;
339 __u64 ptr;
340
341 key = nilfs_bmap_data_get_key(bmap, *bh);
342 if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
343 printk(KERN_CRIT "%s: invalid key: %llu\n", __func__,
344 (unsigned long long)key);
345 return -EINVAL;
346 }
347 ptr = nilfs_direct_get_ptr(bmap, key);
348 if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
349 printk(KERN_CRIT "%s: invalid pointer: %llu\n", __func__,
350 (unsigned long long)ptr);
351 return -EINVAL;
352 }
353
354 return NILFS_BMAP_USE_VBN(bmap) ?
355 nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
356 nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
357}
358
359static const struct nilfs_bmap_operations nilfs_direct_ops = {
360 .bop_lookup = nilfs_direct_lookup,
361 .bop_lookup_contig = nilfs_direct_lookup_contig,
362 .bop_insert = nilfs_direct_insert,
363 .bop_delete = nilfs_direct_delete,
364 .bop_clear = NULL,
365
366 .bop_propagate = nilfs_direct_propagate,
367
368 .bop_lookup_dirty_buffers = NULL,
369
370 .bop_assign = nilfs_direct_assign,
371 .bop_mark = NULL,
372
373 .bop_seek_key = nilfs_direct_seek_key,
374 .bop_last_key = nilfs_direct_last_key,
375
376 .bop_check_insert = nilfs_direct_check_insert,
377 .bop_check_delete = NULL,
378 .bop_gather_data = nilfs_direct_gather_data,
379};
380
381
382int nilfs_direct_init(struct nilfs_bmap *bmap)
383{
384 bmap->b_ops = &nilfs_direct_ops;
385 return 0;
386}
387
