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Merge branch 'mm/pkeys' into x86/urgent, to pick up pkeys fix
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1/*
2 * direct.c - NILFS direct block pointer.
3 *
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
4b420ab4 16 * Written by Koji Sato.
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17 */
18
19#include <linux/errno.h>
20#include "nilfs.h"
21#include "page.h"
22#include "direct.h"
23#include "alloc.h"
c3a7abf0 24#include "dat.h"
36a580eb 25
10ff885b 26static inline __le64 *nilfs_direct_dptrs(const struct nilfs_bmap *direct)
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27{
28 return (__le64 *)
10ff885b 29 ((struct nilfs_direct_node *)direct->b_u.u_data + 1);
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30}
31
32static inline __u64
10ff885b 33nilfs_direct_get_ptr(const struct nilfs_bmap *direct, __u64 key)
36a580eb 34{
25b8d7de 35 return le64_to_cpu(*(nilfs_direct_dptrs(direct) + key));
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36}
37
10ff885b 38static inline void nilfs_direct_set_ptr(struct nilfs_bmap *direct,
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39 __u64 key, __u64 ptr)
40{
25b8d7de 41 *(nilfs_direct_dptrs(direct) + key) = cpu_to_le64(ptr);
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42}
43
10ff885b 44static int nilfs_direct_lookup(const struct nilfs_bmap *direct,
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45 __u64 key, int level, __u64 *ptrp)
46{
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47 __u64 ptr;
48
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49 if (key > NILFS_DIRECT_KEY_MAX || level != 1)
50 return -ENOENT;
51 ptr = nilfs_direct_get_ptr(direct, key);
52 if (ptr == NILFS_BMAP_INVALID_PTR)
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53 return -ENOENT;
54
364ec2d7 55 *ptrp = ptr;
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56 return 0;
57}
58
10ff885b 59static int nilfs_direct_lookup_contig(const struct nilfs_bmap *direct,
c3a7abf0 60 __u64 key, __u64 *ptrp,
0c6c44cb 61 unsigned int maxblocks)
c3a7abf0 62{
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63 struct inode *dat = NULL;
64 __u64 ptr, ptr2;
65 sector_t blocknr;
66 int ret, cnt;
67
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68 if (key > NILFS_DIRECT_KEY_MAX)
69 return -ENOENT;
70 ptr = nilfs_direct_get_ptr(direct, key);
71 if (ptr == NILFS_BMAP_INVALID_PTR)
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72 return -ENOENT;
73
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74 if (NILFS_BMAP_USE_VBN(direct)) {
75 dat = nilfs_bmap_get_dat(direct);
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76 ret = nilfs_dat_translate(dat, ptr, &blocknr);
77 if (ret < 0)
78 return ret;
79 ptr = blocknr;
80 }
81
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82 maxblocks = min_t(unsigned int, maxblocks,
83 NILFS_DIRECT_KEY_MAX - key + 1);
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84 for (cnt = 1; cnt < maxblocks &&
85 (ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) !=
86 NILFS_BMAP_INVALID_PTR;
87 cnt++) {
88 if (dat) {
89 ret = nilfs_dat_translate(dat, ptr2, &blocknr);
90 if (ret < 0)
91 return ret;
92 ptr2 = blocknr;
93 }
94 if (ptr2 != ptr + cnt)
95 break;
96 }
97 *ptrp = ptr;
98 return cnt;
99}
100
36a580eb 101static __u64
10ff885b 102nilfs_direct_find_target_v(const struct nilfs_bmap *direct, __u64 key)
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103{
104 __u64 ptr;
105
10ff885b 106 ptr = nilfs_bmap_find_target_seq(direct, key);
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107 if (ptr != NILFS_BMAP_INVALID_PTR)
108 /* sequential access */
109 return ptr;
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110
111 /* block group */
112 return nilfs_bmap_find_target_in_group(direct);
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113}
114
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115static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
116{
36a580eb 117 union nilfs_bmap_ptr_req req;
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118 struct inode *dat = NULL;
119 struct buffer_head *bh;
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120 int ret;
121
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122 if (key > NILFS_DIRECT_KEY_MAX)
123 return -ENOENT;
10ff885b 124 if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
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125 return -EEXIST;
126
2e0c2c73 127 if (NILFS_BMAP_USE_VBN(bmap)) {
10ff885b 128 req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
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129 dat = nilfs_bmap_get_dat(bmap);
130 }
131 ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
132 if (!ret) {
133 /* ptr must be a pointer to a buffer head. */
134 bh = (struct buffer_head *)((unsigned long)ptr);
135 set_buffer_nilfs_volatile(bh);
36a580eb 136
2e0c2c73 137 nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
10ff885b 138 nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
36a580eb 139
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140 if (!nilfs_bmap_dirty(bmap))
141 nilfs_bmap_set_dirty(bmap);
36a580eb 142
2e0c2c73 143 if (NILFS_BMAP_USE_VBN(bmap))
dc935be2 144 nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
36a580eb 145
be667377 146 nilfs_inode_add_blocks(bmap->b_inode, 1);
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147 }
148 return ret;
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149}
150
151static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key)
152{
36a580eb 153 union nilfs_bmap_ptr_req req;
2e0c2c73 154 struct inode *dat;
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155 int ret;
156
2e0c2c73 157 if (key > NILFS_DIRECT_KEY_MAX ||
10ff885b 158 nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR)
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159 return -ENOENT;
160
2e0c2c73 161 dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL;
10ff885b 162 req.bpr_ptr = nilfs_direct_get_ptr(bmap, key);
36a580eb 163
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164 ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat);
165 if (!ret) {
166 nilfs_bmap_commit_end_ptr(bmap, &req, dat);
10ff885b 167 nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR);
be667377 168 nilfs_inode_sub_blocks(bmap->b_inode, 1);
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169 }
170 return ret;
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171}
172
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173static int nilfs_direct_seek_key(const struct nilfs_bmap *direct, __u64 start,
174 __u64 *keyp)
175{
176 __u64 key;
177
178 for (key = start; key <= NILFS_DIRECT_KEY_MAX; key++) {
179 if (nilfs_direct_get_ptr(direct, key) !=
180 NILFS_BMAP_INVALID_PTR) {
181 *keyp = key;
182 return 0;
183 }
184 }
185 return -ENOENT;
186}
187
10ff885b 188static int nilfs_direct_last_key(const struct nilfs_bmap *direct, __u64 *keyp)
36a580eb 189{
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190 __u64 key, lastkey;
191
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192 lastkey = NILFS_DIRECT_KEY_MAX + 1;
193 for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++)
194 if (nilfs_direct_get_ptr(direct, key) !=
195 NILFS_BMAP_INVALID_PTR)
196 lastkey = key;
197
198 if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
199 return -ENOENT;
200
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201 *keyp = lastkey;
202
203 return 0;
204}
205
206static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key)
207{
208 return key > NILFS_DIRECT_KEY_MAX;
209}
210
10ff885b 211static int nilfs_direct_gather_data(struct nilfs_bmap *direct,
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212 __u64 *keys, __u64 *ptrs, int nitems)
213{
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214 __u64 key;
215 __u64 ptr;
216 int n;
217
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218 if (nitems > NILFS_DIRECT_NBLOCKS)
219 nitems = NILFS_DIRECT_NBLOCKS;
220 n = 0;
221 for (key = 0; key < nitems; key++) {
222 ptr = nilfs_direct_get_ptr(direct, key);
223 if (ptr != NILFS_BMAP_INVALID_PTR) {
224 keys[n] = key;
225 ptrs[n] = ptr;
226 n++;
227 }
228 }
229 return n;
230}
231
232int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap,
3033342a 233 __u64 key, __u64 *keys, __u64 *ptrs, int n)
36a580eb 234{
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235 __le64 *dptrs;
236 int ret, i, j;
237
238 /* no need to allocate any resource for conversion */
239
240 /* delete */
8acfbf09 241 ret = bmap->b_ops->bop_delete(bmap, key);
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242 if (ret < 0)
243 return ret;
244
245 /* free resources */
246 if (bmap->b_ops->bop_clear != NULL)
8acfbf09 247 bmap->b_ops->bop_clear(bmap);
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248
249 /* convert */
10ff885b 250 dptrs = nilfs_direct_dptrs(bmap);
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251 for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
252 if ((j < n) && (i == keys[j])) {
253 dptrs[i] = (i != key) ?
25b8d7de 254 cpu_to_le64(ptrs[j]) :
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255 NILFS_BMAP_INVALID_PTR;
256 j++;
257 } else
258 dptrs[i] = NILFS_BMAP_INVALID_PTR;
259 }
260
3033342a 261 nilfs_direct_init(bmap);
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262 return 0;
263}
264
583ada47 265static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
2e0c2c73 266 struct buffer_head *bh)
36a580eb 267{
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268 struct nilfs_palloc_req oldreq, newreq;
269 struct inode *dat;
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270 __u64 key;
271 __u64 ptr;
272 int ret;
273
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274 if (!NILFS_BMAP_USE_VBN(bmap))
275 return 0;
276
277 dat = nilfs_bmap_get_dat(bmap);
278 key = nilfs_bmap_data_get_key(bmap, bh);
10ff885b 279 ptr = nilfs_direct_get_ptr(bmap, key);
36a580eb 280 if (!buffer_nilfs_volatile(bh)) {
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281 oldreq.pr_entry_nr = ptr;
282 newreq.pr_entry_nr = ptr;
283 ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq);
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284 if (ret < 0)
285 return ret;
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286 nilfs_dat_commit_update(dat, &oldreq, &newreq,
287 bmap->b_ptr_type == NILFS_BMAP_PTR_VS);
36a580eb 288 set_buffer_nilfs_volatile(bh);
10ff885b 289 nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr);
36a580eb 290 } else
2e0c2c73 291 ret = nilfs_dat_mark_dirty(dat, ptr);
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292
293 return ret;
294}
295
10ff885b 296static int nilfs_direct_assign_v(struct nilfs_bmap *direct,
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297 __u64 key, __u64 ptr,
298 struct buffer_head **bh,
299 sector_t blocknr,
300 union nilfs_binfo *binfo)
301{
10ff885b 302 struct inode *dat = nilfs_bmap_get_dat(direct);
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303 union nilfs_bmap_ptr_req req;
304 int ret;
305
306 req.bpr_ptr = ptr;
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307 ret = nilfs_dat_prepare_start(dat, &req.bpr_req);
308 if (!ret) {
309 nilfs_dat_commit_start(dat, &req.bpr_req, blocknr);
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310 binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr);
311 binfo->bi_v.bi_blkoff = cpu_to_le64(key);
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312 }
313 return ret;
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314}
315
10ff885b 316static int nilfs_direct_assign_p(struct nilfs_bmap *direct,
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317 __u64 key, __u64 ptr,
318 struct buffer_head **bh,
319 sector_t blocknr,
320 union nilfs_binfo *binfo)
321{
322 nilfs_direct_set_ptr(direct, key, blocknr);
323
25b8d7de 324 binfo->bi_dat.bi_blkoff = cpu_to_le64(key);
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325 binfo->bi_dat.bi_level = 0;
326
327 return 0;
328}
329
330static int nilfs_direct_assign(struct nilfs_bmap *bmap,
331 struct buffer_head **bh,
332 sector_t blocknr,
333 union nilfs_binfo *binfo)
334{
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335 __u64 key;
336 __u64 ptr;
337
36a580eb 338 key = nilfs_bmap_data_get_key(bmap, *bh);
1f5abe7e 339 if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
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340 nilfs_msg(bmap->b_inode->i_sb, KERN_CRIT,
341 "%s (ino=%lu): invalid key: %llu", __func__,
342 bmap->b_inode->i_ino, (unsigned long long)key);
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343 return -EINVAL;
344 }
10ff885b 345 ptr = nilfs_direct_get_ptr(bmap, key);
1f5abe7e 346 if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
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347 nilfs_msg(bmap->b_inode->i_sb, KERN_CRIT,
348 "%s (ino=%lu): invalid pointer: %llu", __func__,
349 bmap->b_inode->i_ino, (unsigned long long)ptr);
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350 return -EINVAL;
351 }
36a580eb 352
355c6b61 353 return NILFS_BMAP_USE_VBN(bmap) ?
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354 nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) :
355 nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo);
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356}
357
358static const struct nilfs_bmap_operations nilfs_direct_ops = {
359 .bop_lookup = nilfs_direct_lookup,
c3a7abf0 360 .bop_lookup_contig = nilfs_direct_lookup_contig,
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361 .bop_insert = nilfs_direct_insert,
362 .bop_delete = nilfs_direct_delete,
363 .bop_clear = NULL,
364
365 .bop_propagate = nilfs_direct_propagate,
366
367 .bop_lookup_dirty_buffers = NULL,
368
369 .bop_assign = nilfs_direct_assign,
370 .bop_mark = NULL,
371
5b20384f 372 .bop_seek_key = nilfs_direct_seek_key,
36a580eb 373 .bop_last_key = nilfs_direct_last_key,
5b20384f 374
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375 .bop_check_insert = nilfs_direct_check_insert,
376 .bop_check_delete = NULL,
377 .bop_gather_data = nilfs_direct_gather_data,
378};
379
380
3033342a 381int nilfs_direct_init(struct nilfs_bmap *bmap)
36a580eb 382{
36a580eb 383 bmap->b_ops = &nilfs_direct_ops;
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384 return 0;
385}