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
nilfs_direct_dptrs(const struct nilfs_bmap * direct)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
nilfs_direct_get_ptr(const struct nilfs_bmap * direct,__u64 key)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
nilfs_direct_set_ptr(struct nilfs_bmap * direct,__u64 key,__u64 ptr)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
nilfs_direct_lookup(const struct nilfs_bmap * direct,__u64 key,int level,__u64 * ptrp)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
nilfs_direct_lookup_contig(const struct nilfs_bmap * direct,__u64 key,__u64 * ptrp,unsigned int maxblocks)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
nilfs_direct_find_target_v(const struct nilfs_bmap * direct,__u64 key)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
nilfs_direct_insert(struct nilfs_bmap * bmap,__u64 key,__u64 ptr)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
nilfs_direct_delete(struct nilfs_bmap * bmap,__u64 key)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
nilfs_direct_seek_key(const struct nilfs_bmap * direct,__u64 start,__u64 * keyp)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
nilfs_direct_last_key(const struct nilfs_bmap * direct,__u64 * keyp)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
nilfs_direct_check_insert(const struct nilfs_bmap * bmap,__u64 key)202 static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
203 {
204 return key > NILFS_DIRECT_KEY_MAX;
205 }
206
nilfs_direct_gather_data(struct nilfs_bmap * direct,__u64 * keys,__u64 * ptrs,int nitems)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
nilfs_direct_delete_and_convert(struct nilfs_bmap * bmap,__u64 key,__u64 * keys,__u64 * ptrs,int n)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
nilfs_direct_propagate(struct nilfs_bmap * bmap,struct buffer_head * bh)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 (ptr == NILFS_BMAP_INVALID_PTR)
277 return -EINVAL;
278
279 if (!buffer_nilfs_volatile(bh)) {
280 oldreq.pr_entry_nr = ptr;
281 newreq.pr_entry_nr = ptr;
282 ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
283 if (ret < 0)
284 return ret;
285 nilfs_dat_commit_update(dat, &oldreq, &newreq,
286 bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
287 set_buffer_nilfs_volatile(bh);
288 nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
289 } else
290 ret = nilfs_dat_mark_dirty(dat, ptr);
291
292 return ret;
293 }
294
nilfs_direct_assign_v(struct nilfs_bmap * direct,__u64 key,__u64 ptr,struct buffer_head ** bh,sector_t blocknr,union nilfs_binfo * binfo)295 static int nilfs_direct_assign_v(struct nilfs_bmap *direct,
296 __u64 key, __u64 ptr,
297 struct buffer_head **bh,
298 sector_t blocknr,
299 union nilfs_binfo *binfo)
300 {
301 struct inode *dat = nilfs_bmap_get_dat(direct);
302 union nilfs_bmap_ptr_req req;
303 int ret;
304
305 req.bpr_ptr = ptr;
306 ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
307 if (!ret) {
308 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
309 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
310 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
311 }
312 return ret;
313 }
314
nilfs_direct_assign_p(struct nilfs_bmap * direct,__u64 key,__u64 ptr,struct buffer_head ** bh,sector_t blocknr,union nilfs_binfo * binfo)315 static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
316 __u64 key, __u64 ptr,
317 struct buffer_head **bh,
318 sector_t blocknr,
319 union nilfs_binfo *binfo)
320 {
321 nilfs_direct_set_ptr(direct, key, blocknr);
322
323 binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
324 binfo->bi_dat.bi_level = 0;
325 memset(binfo->bi_dat.bi_pad, 0, sizeof(binfo->bi_dat.bi_pad));
326
327 return 0;
328 }
329
nilfs_direct_assign(struct nilfs_bmap * bmap,struct buffer_head ** bh,sector_t blocknr,union nilfs_binfo * binfo)330 static int nilfs_direct_assign(struct nilfs_bmap *bmap,
331 struct buffer_head **bh,
332 sector_t blocknr,
333 union nilfs_binfo *binfo)
334 {
335 __u64 key;
336 __u64 ptr;
337
338 key = nilfs_bmap_data_get_key(bmap, *bh);
339 if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
340 nilfs_crit(bmap->b_inode->i_sb,
341 "%s (ino=%lu): invalid key: %llu",
342 __func__,
343 bmap->b_inode->i_ino, (unsigned long long)key);
344 return -EINVAL;
345 }
346 ptr = nilfs_direct_get_ptr(bmap, key);
347 if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
348 nilfs_crit(bmap->b_inode->i_sb,
349 "%s (ino=%lu): invalid pointer: %llu",
350 __func__,
351 bmap->b_inode->i_ino, (unsigned long long)ptr);
352 return -EINVAL;
353 }
354
355 return NILFS_BMAP_USE_VBN(bmap) ?
356 nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
357 nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
358 }
359
360 static const struct nilfs_bmap_operations nilfs_direct_ops = {
361 .bop_lookup = nilfs_direct_lookup,
362 .bop_lookup_contig = nilfs_direct_lookup_contig,
363 .bop_insert = nilfs_direct_insert,
364 .bop_delete = nilfs_direct_delete,
365 .bop_clear = NULL,
366
367 .bop_propagate = nilfs_direct_propagate,
368
369 .bop_lookup_dirty_buffers = NULL,
370
371 .bop_assign = nilfs_direct_assign,
372 .bop_mark = NULL,
373
374 .bop_seek_key = nilfs_direct_seek_key,
375 .bop_last_key = nilfs_direct_last_key,
376
377 .bop_check_insert = nilfs_direct_check_insert,
378 .bop_check_delete = NULL,
379 .bop_gather_data = nilfs_direct_gather_data,
380 };
381
382
nilfs_direct_init(struct nilfs_bmap * bmap)383 int nilfs_direct_init(struct nilfs_bmap *bmap)
384 {
385 bmap->b_ops = &nilfs_direct_ops;
386 return 0;
387 }
388