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 return ret;
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 return ret;
83 ptr2 = blocknr;
84 }
85 if (ptr2 != ptr + cnt)
86 break;
87 }
88 *ptrp = ptr;
89 return cnt;
90 }
91
92 static __u64
nilfs_direct_find_target_v(const struct nilfs_bmap * direct,__u64 key)93 nilfs_direct_find_target_v(const struct nilfs_bmap *direct, __u64 key)
94 {
95 __u64 ptr;
96
97 ptr = nilfs_bmap_find_target_seq(direct, key);
98 if (ptr != NILFS_BMAP_INVALID_PTR)
99 /* sequential access */
100 return ptr;
101
102 /* block group */
103 return nilfs_bmap_find_target_in_group(direct);
104 }
105
nilfs_direct_insert(struct nilfs_bmap * bmap,__u64 key,__u64 ptr)106 static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
107 {
108 union nilfs_bmap_ptr_req req;
109 struct inode *dat = NULL;
110 struct buffer_head *bh;
111 int ret;
112
113 if (key > NILFS_DIRECT_KEY_MAX)
114 return -ENOENT;
115 if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
116 return -EEXIST;
117
118 if (NILFS_BMAP_USE_VBN(bmap)) {
119 req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
120 dat = nilfs_bmap_get_dat(bmap);
121 }
122 ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
123 if (!ret) {
124 /* ptr must be a pointer to a buffer head. */
125 bh = (struct buffer_head *)((unsigned long)ptr);
126 set_buffer_nilfs_volatile(bh);
127
128 nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
129 nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
130
131 if (!nilfs_bmap_dirty(bmap))
132 nilfs_bmap_set_dirty(bmap);
133
134 if (NILFS_BMAP_USE_VBN(bmap))
135 nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
136
137 nilfs_inode_add_blocks(bmap->b_inode, 1);
138 }
139 return ret;
140 }
141
nilfs_direct_delete(struct nilfs_bmap * bmap,__u64 key)142 static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
143 {
144 union nilfs_bmap_ptr_req req;
145 struct inode *dat;
146 int ret;
147
148 if (key > NILFS_DIRECT_KEY_MAX ||
149 nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR)
150 return -ENOENT;
151
152 dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
153 req.bpr_ptr = nilfs_direct_get_ptr(bmap, key);
154
155 ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
156 if (!ret) {
157 nilfs_bmap_commit_end_ptr(bmap, &req, dat);
158 nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR);
159 nilfs_inode_sub_blocks(bmap->b_inode, 1);
160 }
161 return ret;
162 }
163
nilfs_direct_seek_key(const struct nilfs_bmap * direct,__u64 start,__u64 * keyp)164 static int nilfs_direct_seek_key(const struct nilfs_bmap *direct, __u64 start,
165 __u64 *keyp)
166 {
167 __u64 key;
168
169 for (key = start; key <= NILFS_DIRECT_KEY_MAX; key++) {
170 if (nilfs_direct_get_ptr(direct, key) !=
171 NILFS_BMAP_INVALID_PTR) {
172 *keyp = key;
173 return 0;
174 }
175 }
176 return -ENOENT;
177 }
178
nilfs_direct_last_key(const struct nilfs_bmap * direct,__u64 * keyp)179 static int nilfs_direct_last_key(const struct nilfs_bmap *direct, __u64 *keyp)
180 {
181 __u64 key, lastkey;
182
183 lastkey = NILFS_DIRECT_KEY_MAX + 1;
184 for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
185 if (nilfs_direct_get_ptr(direct, key) !=
186 NILFS_BMAP_INVALID_PTR)
187 lastkey = key;
188
189 if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
190 return -ENOENT;
191
192 *keyp = lastkey;
193
194 return 0;
195 }
196
nilfs_direct_check_insert(const struct nilfs_bmap * bmap,__u64 key)197 static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
198 {
199 return key > NILFS_DIRECT_KEY_MAX;
200 }
201
nilfs_direct_gather_data(struct nilfs_bmap * direct,__u64 * keys,__u64 * ptrs,int nitems)202 static int nilfs_direct_gather_data(struct nilfs_bmap *direct,
203 __u64 *keys, __u64 *ptrs, int nitems)
204 {
205 __u64 key;
206 __u64 ptr;
207 int n;
208
209 if (nitems > NILFS_DIRECT_NBLOCKS)
210 nitems = NILFS_DIRECT_NBLOCKS;
211 n = 0;
212 for (key = 0; key < nitems; key++) {
213 ptr = nilfs_direct_get_ptr(direct, key);
214 if (ptr != NILFS_BMAP_INVALID_PTR) {
215 keys[n] = key;
216 ptrs[n] = ptr;
217 n++;
218 }
219 }
220 return n;
221 }
222
nilfs_direct_delete_and_convert(struct nilfs_bmap * bmap,__u64 key,__u64 * keys,__u64 * ptrs,int n)223 int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
224 __u64 key, __u64 *keys, __u64 *ptrs, int n)
225 {
226 __le64 *dptrs;
227 int ret, i, j;
228
229 /* no need to allocate any resource for conversion */
230
231 /* delete */
232 ret = bmap->b_ops->bop_delete(bmap, key);
233 if (ret < 0)
234 return ret;
235
236 /* free resources */
237 if (bmap->b_ops->bop_clear != NULL)
238 bmap->b_ops->bop_clear(bmap);
239
240 /* convert */
241 dptrs = nilfs_direct_dptrs(bmap);
242 for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
243 if ((j < n) && (i == keys[j])) {
244 dptrs[i] = (i != key) ?
245 cpu_to_le64(ptrs[j]) :
246 NILFS_BMAP_INVALID_PTR;
247 j++;
248 } else
249 dptrs[i] = NILFS_BMAP_INVALID_PTR;
250 }
251
252 nilfs_direct_init(bmap);
253 return 0;
254 }
255
nilfs_direct_propagate(struct nilfs_bmap * bmap,struct buffer_head * bh)256 static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
257 struct buffer_head *bh)
258 {
259 struct nilfs_palloc_req oldreq, newreq;
260 struct inode *dat;
261 __u64 key;
262 __u64 ptr;
263 int ret;
264
265 if (!NILFS_BMAP_USE_VBN(bmap))
266 return 0;
267
268 dat = nilfs_bmap_get_dat(bmap);
269 key = nilfs_bmap_data_get_key(bmap, bh);
270 ptr = nilfs_direct_get_ptr(bmap, key);
271 if (!buffer_nilfs_volatile(bh)) {
272 oldreq.pr_entry_nr = ptr;
273 newreq.pr_entry_nr = ptr;
274 ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
275 if (ret < 0)
276 return ret;
277 nilfs_dat_commit_update(dat, &oldreq, &newreq,
278 bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
279 set_buffer_nilfs_volatile(bh);
280 nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
281 } else
282 ret = nilfs_dat_mark_dirty(dat, ptr);
283
284 return ret;
285 }
286
nilfs_direct_assign_v(struct nilfs_bmap * direct,__u64 key,__u64 ptr,struct buffer_head ** bh,sector_t blocknr,union nilfs_binfo * binfo)287 static int nilfs_direct_assign_v(struct nilfs_bmap *direct,
288 __u64 key, __u64 ptr,
289 struct buffer_head **bh,
290 sector_t blocknr,
291 union nilfs_binfo *binfo)
292 {
293 struct inode *dat = nilfs_bmap_get_dat(direct);
294 union nilfs_bmap_ptr_req req;
295 int ret;
296
297 req.bpr_ptr = ptr;
298 ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
299 if (!ret) {
300 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
301 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
302 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
303 }
304 return ret;
305 }
306
nilfs_direct_assign_p(struct nilfs_bmap * direct,__u64 key,__u64 ptr,struct buffer_head ** bh,sector_t blocknr,union nilfs_binfo * binfo)307 static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
308 __u64 key, __u64 ptr,
309 struct buffer_head **bh,
310 sector_t blocknr,
311 union nilfs_binfo *binfo)
312 {
313 nilfs_direct_set_ptr(direct, key, blocknr);
314
315 binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
316 binfo->bi_dat.bi_level = 0;
317 memset(binfo->bi_dat.bi_pad, 0, sizeof(binfo->bi_dat.bi_pad));
318
319 return 0;
320 }
321
nilfs_direct_assign(struct nilfs_bmap * bmap,struct buffer_head ** bh,sector_t blocknr,union nilfs_binfo * binfo)322 static int nilfs_direct_assign(struct nilfs_bmap *bmap,
323 struct buffer_head **bh,
324 sector_t blocknr,
325 union nilfs_binfo *binfo)
326 {
327 __u64 key;
328 __u64 ptr;
329
330 key = nilfs_bmap_data_get_key(bmap, *bh);
331 if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
332 nilfs_crit(bmap->b_inode->i_sb,
333 "%s (ino=%lu): invalid key: %llu",
334 __func__,
335 bmap->b_inode->i_ino, (unsigned long long)key);
336 return -EINVAL;
337 }
338 ptr = nilfs_direct_get_ptr(bmap, key);
339 if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
340 nilfs_crit(bmap->b_inode->i_sb,
341 "%s (ino=%lu): invalid pointer: %llu",
342 __func__,
343 bmap->b_inode->i_ino, (unsigned long long)ptr);
344 return -EINVAL;
345 }
346
347 return NILFS_BMAP_USE_VBN(bmap) ?
348 nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
349 nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
350 }
351
352 static const struct nilfs_bmap_operations nilfs_direct_ops = {
353 .bop_lookup = nilfs_direct_lookup,
354 .bop_lookup_contig = nilfs_direct_lookup_contig,
355 .bop_insert = nilfs_direct_insert,
356 .bop_delete = nilfs_direct_delete,
357 .bop_clear = NULL,
358
359 .bop_propagate = nilfs_direct_propagate,
360
361 .bop_lookup_dirty_buffers = NULL,
362
363 .bop_assign = nilfs_direct_assign,
364 .bop_mark = NULL,
365
366 .bop_seek_key = nilfs_direct_seek_key,
367 .bop_last_key = nilfs_direct_last_key,
368
369 .bop_check_insert = nilfs_direct_check_insert,
370 .bop_check_delete = NULL,
371 .bop_gather_data = nilfs_direct_gather_data,
372 };
373
374
nilfs_direct_init(struct nilfs_bmap * bmap)375 int nilfs_direct_init(struct nilfs_bmap *bmap)
376 {
377 bmap->b_ops = &nilfs_direct_ops;
378 return 0;
379 }
380
