1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * NILFS direct block pointer.
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato.
8 */
9
10 #include <linux/errno.h>
11 #include "nilfs.h"
12 #include "page.h"
13 #include "direct.h"
14 #include "alloc.h"
15 #include "dat.h"
16
17 static inline __le64 *nilfs_direct_dptrs(const struct nilfs_bmap *direct)
18 {
19 return (__le64 *)
20 ((struct nilfs_direct_node *)direct->b_u.u_data + 1);
21 }
22
23 static inline __u64
24 nilfs_direct_get_ptr(const struct nilfs_bmap *direct, __u64 key)
25 {
26 return le64_to_cpu(*(nilfs_direct_dptrs(direct) + key));
27 }
28
29 static inline void nilfs_direct_set_ptr(struct nilfs_bmap *direct,
30 __u64 key, __u64 ptr)
31 {
32 *(nilfs_direct_dptrs(direct) + key) = cpu_to_le64(ptr);
33 }
34
35 static int nilfs_direct_lookup(const struct nilfs_bmap *direct,
36 __u64 key, int level, __u64 *ptrp)
37 {
38 __u64 ptr;
39
40 if (key > NILFS_DIRECT_KEY_MAX || level != 1)
41 return -ENOENT;
42 ptr = nilfs_direct_get_ptr(direct, key);
43 if (ptr == NILFS_BMAP_INVALID_PTR)
44 return -ENOENT;
45
46 *ptrp = ptr;
47 return 0;
48 }
49
50 static int nilfs_direct_lookup_contig(const struct nilfs_bmap *direct,
51 __u64 key, __u64 *ptrp,
52 unsigned int maxblocks)
53 {
54 struct inode *dat = NULL;
55 __u64 ptr, ptr2;
56 sector_t blocknr;
57 int ret, cnt;
58
59 if (key > NILFS_DIRECT_KEY_MAX)
60 return -ENOENT;
61 ptr = nilfs_direct_get_ptr(direct, key);
62 if (ptr == NILFS_BMAP_INVALID_PTR)
63 return -ENOENT;
64
65 if (NILFS_BMAP_USE_VBN(direct)) {
66 dat = nilfs_bmap_get_dat(direct);
67 ret = nilfs_dat_translate(dat, ptr, &blocknr);
68 if (ret < 0)
69 goto dat_error;
70 ptr = blocknr;
71 }
72
73 maxblocks = min_t(unsigned int, maxblocks,
74 NILFS_DIRECT_KEY_MAX - key + 1);
75 for (cnt = 1; cnt < maxblocks &&
76 (ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) !=
77 NILFS_BMAP_INVALID_PTR;
78 cnt++) {
79 if (dat) {
80 ret = nilfs_dat_translate(dat, ptr2, &blocknr);
81 if (ret < 0)
82 goto dat_error;
83 ptr2 = blocknr;
84 }
85 if (ptr2 != ptr + cnt)
86 break;
87 }
88 *ptrp = ptr;
89 return cnt;
90
91 dat_error:
92 if (ret == -ENOENT)
93 ret = -EINVAL; /* Notify bmap layer of metadata corruption */
94 return ret;
95 }
96
97 static __u64
98 nilfs_direct_find_target_v(const struct nilfs_bmap *direct, __u64 key)
99 {
100 __u64 ptr;
101
102 ptr = nilfs_bmap_find_target_seq(direct, key);
103 if (ptr != NILFS_BMAP_INVALID_PTR)
104 /* sequential access */
105 return ptr;
106
107 /* block group */
108 return nilfs_bmap_find_target_in_group(direct);
109 }
110
111 static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
112 {
113 union nilfs_bmap_ptr_req req;
114 struct inode *dat = NULL;
115 struct buffer_head *bh;
116 int ret;
117
118 if (key > NILFS_DIRECT_KEY_MAX)
119 return -ENOENT;
120 if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
121 return -EEXIST;
122
123 if (NILFS_BMAP_USE_VBN(bmap)) {
124 req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
125 dat = nilfs_bmap_get_dat(bmap);
126 }
127 ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
128 if (!ret) {
129 /* ptr must be a pointer to a buffer head. */
130 bh = (struct buffer_head *)((unsigned long)ptr);
131 set_buffer_nilfs_volatile(bh);
132
133 nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
134 nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
135
136 if (!nilfs_bmap_dirty(bmap))
137 nilfs_bmap_set_dirty(bmap);
138
139 if (NILFS_BMAP_USE_VBN(bmap))
140 nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
141
142 nilfs_inode_add_blocks(bmap->b_inode, 1);
143 }
144 return ret;
145 }
146
147 static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
148 {
149 union nilfs_bmap_ptr_req req;
150 struct inode *dat;
151 int ret;
152
153 if (key > NILFS_DIRECT_KEY_MAX ||
154 nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR)
155 return -ENOENT;
156
157 dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
158 req.bpr_ptr = nilfs_direct_get_ptr(bmap, key);
159
160 ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
161 if (!ret) {
162 nilfs_bmap_commit_end_ptr(bmap, &req, dat);
163 nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR);
164 nilfs_inode_sub_blocks(bmap->b_inode, 1);
165 }
166 return ret;
167 }
168
169 static int nilfs_direct_seek_key(const struct nilfs_bmap *direct, __u64 start,
170 __u64 *keyp)
171 {
172 __u64 key;
173
174 for (key = start; key <= NILFS_DIRECT_KEY_MAX; key++) {
175 if (nilfs_direct_get_ptr(direct, key) !=
176 NILFS_BMAP_INVALID_PTR) {
177 *keyp = key;
178 return 0;
179 }
180 }
181 return -ENOENT;
182 }
183
184 static int nilfs_direct_last_key(const struct nilfs_bmap *direct, __u64 *keyp)
185 {
186 __u64 key, lastkey;
187
188 lastkey = NILFS_DIRECT_KEY_MAX + 1;
189 for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
190 if (nilfs_direct_get_ptr(direct, key) !=
191 NILFS_BMAP_INVALID_PTR)
192 lastkey = key;
193
194 if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
195 return -ENOENT;
196
197 *keyp = lastkey;
198
199 return 0;
200 }
201
202 static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
203 {
204 return key > NILFS_DIRECT_KEY_MAX;
205 }
206
207 static int nilfs_direct_gather_data(struct nilfs_bmap *direct,
208 __u64 *keys, __u64 *ptrs, int nitems)
209 {
210 __u64 key;
211 __u64 ptr;
212 int n;
213
214 if (nitems > NILFS_DIRECT_NBLOCKS)
215 nitems = NILFS_DIRECT_NBLOCKS;
216 n = 0;
217 for (key = 0; key < nitems; key++) {
218 ptr = nilfs_direct_get_ptr(direct, key);
219 if (ptr != NILFS_BMAP_INVALID_PTR) {
220 keys[n] = key;
221 ptrs[n] = ptr;
222 n++;
223 }
224 }
225 return n;
226 }
227
228 int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
229 __u64 key, __u64 *keys, __u64 *ptrs, int n)
230 {
231 __le64 *dptrs;
232 int ret, i, j;
233
234 /* no need to allocate any resource for conversion */
235
236 /* delete */
237 ret = bmap->b_ops->bop_delete(bmap, key);
238 if (ret < 0)
239 return ret;
240
241 /* free resources */
242 if (bmap->b_ops->bop_clear != NULL)
243 bmap->b_ops->bop_clear(bmap);
244
245 /* convert */
246 dptrs = nilfs_direct_dptrs(bmap);
247 for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
248 if ((j < n) && (i == keys[j])) {
249 dptrs[i] = (i != key) ?
250 cpu_to_le64(ptrs[j]) :
251 NILFS_BMAP_INVALID_PTR;
252 j++;
253 } else
254 dptrs[i] = NILFS_BMAP_INVALID_PTR;
255 }
256
257 nilfs_direct_init(bmap);
258 return 0;
259 }
260
261 static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
262 struct buffer_head *bh)
263 {
264 struct nilfs_palloc_req oldreq, newreq;
265 struct inode *dat;
266 __u64 key;
267 __u64 ptr;
268 int ret;
269
270 if (!NILFS_BMAP_USE_VBN(bmap))
271 return 0;
272
273 dat = nilfs_bmap_get_dat(bmap);
274 key = nilfs_bmap_data_get_key(bmap, bh);
275 ptr = nilfs_direct_get_ptr(bmap, key);
276 if (!buffer_nilfs_volatile(bh)) {
277 oldreq.pr_entry_nr = ptr;
278 newreq.pr_entry_nr = ptr;
279 ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
280 if (ret < 0)
281 return ret;
282 nilfs_dat_commit_update(dat, &oldreq, &newreq,
283 bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
284 set_buffer_nilfs_volatile(bh);
285 nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
286 } else
287 ret = nilfs_dat_mark_dirty(dat, ptr);
288
289 return ret;
290 }
291
292 static int nilfs_direct_assign_v(struct nilfs_bmap *direct,
293 __u64 key, __u64 ptr,
294 struct buffer_head **bh,
295 sector_t blocknr,
296 union nilfs_binfo *binfo)
297 {
298 struct inode *dat = nilfs_bmap_get_dat(direct);
299 union nilfs_bmap_ptr_req req;
300 int ret;
301
302 req.bpr_ptr = ptr;
303 ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
304 if (!ret) {
305 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
306 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
307 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
308 }
309 return ret;
310 }
311
312 static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
313 __u64 key, __u64 ptr,
314 struct buffer_head **bh,
315 sector_t blocknr,
316 union nilfs_binfo *binfo)
317 {
318 nilfs_direct_set_ptr(direct, key, blocknr);
319
320 binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
321 binfo->bi_dat.bi_level = 0;
322 memset(binfo->bi_dat.bi_pad, 0, sizeof(binfo->bi_dat.bi_pad));
323
324 return 0;
325 }
326
327 static int nilfs_direct_assign(struct nilfs_bmap *bmap,
328 struct buffer_head **bh,
329 sector_t blocknr,
330 union nilfs_binfo *binfo)
331 {
332 __u64 key;
333 __u64 ptr;
334
335 key = nilfs_bmap_data_get_key(bmap, *bh);
336 if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
337 nilfs_crit(bmap->b_inode->i_sb,
338 "%s (ino=%lu): invalid key: %llu",
339 __func__,
340 bmap->b_inode->i_ino, (unsigned long long)key);
341 return -EINVAL;
342 }
343 ptr = nilfs_direct_get_ptr(bmap, key);
344 if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
345 nilfs_crit(bmap->b_inode->i_sb,
346 "%s (ino=%lu): invalid pointer: %llu",
347 __func__,
348 bmap->b_inode->i_ino, (unsigned long long)ptr);
349 return -EINVAL;
350 }
351
352 return NILFS_BMAP_USE_VBN(bmap) ?
353 nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
354 nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
355 }
356
357 static const struct nilfs_bmap_operations nilfs_direct_ops = {
358 .bop_lookup = nilfs_direct_lookup,
359 .bop_lookup_contig = nilfs_direct_lookup_contig,
360 .bop_insert = nilfs_direct_insert,
361 .bop_delete = nilfs_direct_delete,
362 .bop_clear = NULL,
363
364 .bop_propagate = nilfs_direct_propagate,
365
366 .bop_lookup_dirty_buffers = NULL,
367
368 .bop_assign = nilfs_direct_assign,
369 .bop_mark = NULL,
370
371 .bop_seek_key = nilfs_direct_seek_key,
372 .bop_last_key = nilfs_direct_last_key,
373
374 .bop_check_insert = nilfs_direct_check_insert,
375 .bop_check_delete = NULL,
376 .bop_gather_data = nilfs_direct_gather_data,
377 };
378
379
380 int nilfs_direct_init(struct nilfs_bmap *bmap)
381 {
382 bmap->b_ops = &nilfs_direct_ops;
383 return 0;
384 }
385
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