Blame view
fs/exfat/fatent.c
9.21 KB
31023864e
exfat: add fat en...
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*/
#include <linux/slab.h>
#include <asm/unaligned.h>
#include <linux/buffer_head.h>
#include "exfat_raw.h"
#include "exfat_fs.h"
static int exfat_mirror_bh(struct super_block *sb, sector_t sec,
struct buffer_head *bh)
{
struct buffer_head *c_bh;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
sector_t sec2;
int err = 0;
if (sbi->FAT2_start_sector != sbi->FAT1_start_sector) {
sec2 = sec - sbi->FAT1_start_sector + sbi->FAT2_start_sector;
c_bh = sb_getblk(sb, sec2);
if (!c_bh)
return -ENOMEM;
memcpy(c_bh->b_data, bh->b_data, sb->s_blocksize);
set_buffer_uptodate(c_bh);
mark_buffer_dirty(c_bh);
if (sb->s_flags & SB_SYNCHRONOUS)
err = sync_dirty_buffer(c_bh);
brelse(c_bh);
}
return err;
}
static int __exfat_ent_get(struct super_block *sb, unsigned int loc,
unsigned int *content)
{
unsigned int off;
sector_t sec;
struct buffer_head *bh;
sec = FAT_ENT_OFFSET_SECTOR(sb, loc);
off = FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc);
bh = sb_bread(sb, sec);
if (!bh)
return -EIO;
*content = le32_to_cpu(*(__le32 *)(&bh->b_data[off]));
/* remap reserved clusters to simplify code */
if (*content > EXFAT_BAD_CLUSTER)
*content = EXFAT_EOF_CLUSTER;
brelse(bh);
return 0;
}
int exfat_ent_set(struct super_block *sb, unsigned int loc,
unsigned int content)
{
unsigned int off;
sector_t sec;
__le32 *fat_entry;
struct buffer_head *bh;
sec = FAT_ENT_OFFSET_SECTOR(sb, loc);
off = FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc);
bh = sb_bread(sb, sec);
if (!bh)
return -EIO;
fat_entry = (__le32 *)&(bh->b_data[off]);
*fat_entry = cpu_to_le32(content);
|
2c7f8937e
exfat: remove EXF...
|
78 |
exfat_update_bh(bh, sb->s_flags & SB_SYNCHRONOUS); |
|
31023864e
exfat: add fat en...
|
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 |
exfat_mirror_bh(sb, sec, bh);
brelse(bh);
return 0;
}
static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
unsigned int clus)
{
if (clus < EXFAT_FIRST_CLUSTER || sbi->num_clusters <= clus)
return false;
return true;
}
int exfat_ent_get(struct super_block *sb, unsigned int loc,
unsigned int *content)
{
struct exfat_sb_info *sbi = EXFAT_SB(sb);
int err;
if (!is_valid_cluster(sbi, loc)) {
exfat_fs_error(sb, "invalid access to FAT (entry 0x%08x)",
loc);
return -EIO;
}
err = __exfat_ent_get(sb, loc, content);
if (err) {
exfat_fs_error(sb,
"failed to access to FAT (entry 0x%08x, err:%d)",
loc, err);
return err;
}
if (*content == EXFAT_FREE_CLUSTER) {
exfat_fs_error(sb,
"invalid access to FAT free cluster (entry 0x%08x)",
loc);
return -EIO;
}
if (*content == EXFAT_BAD_CLUSTER) {
exfat_fs_error(sb,
"invalid access to FAT bad cluster (entry 0x%08x)",
loc);
return -EIO;
}
if (*content != EXFAT_EOF_CLUSTER && !is_valid_cluster(sbi, *content)) {
exfat_fs_error(sb,
"invalid access to FAT (entry 0x%08x) bogus content (0x%08x)",
loc, *content);
return -EIO;
}
return 0;
}
int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
unsigned int len)
{
if (!len)
return 0;
while (len > 1) {
if (exfat_ent_set(sb, chain, chain + 1))
return -EIO;
chain++;
len--;
}
if (exfat_ent_set(sb, chain, EXFAT_EOF_CLUSTER))
return -EIO;
return 0;
}
int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain)
{
unsigned int num_clusters = 0;
unsigned int clu;
struct super_block *sb = inode->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
/* invalid cluster number */
if (p_chain->dir == EXFAT_FREE_CLUSTER ||
p_chain->dir == EXFAT_EOF_CLUSTER ||
p_chain->dir < EXFAT_FIRST_CLUSTER)
return 0;
/* no cluster to truncate */
if (p_chain->size == 0)
return 0;
/* check cluster validation */
|
a949824f0
exfat: fix range ...
|
172 |
if (!is_valid_cluster(sbi, p_chain->dir)) {
|
d1727d55c
exfat: Use a more...
|
173 |
exfat_err(sb, "invalid start cluster (%u)", p_chain->dir); |
|
31023864e
exfat: add fat en...
|
174 175 |
return -EIO; } |
|
31023864e
exfat: add fat en...
|
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 |
clu = p_chain->dir;
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
do {
exfat_clear_bitmap(inode, clu);
clu++;
num_clusters++;
} while (num_clusters < p_chain->size);
} else {
do {
exfat_clear_bitmap(inode, clu);
if (exfat_get_next_cluster(sb, &clu))
goto dec_used_clus;
num_clusters++;
} while (clu != EXFAT_EOF_CLUSTER);
}
dec_used_clus:
sbi->used_clusters -= num_clusters;
return 0;
}
int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
unsigned int *ret_clu)
{
unsigned int clu, next;
unsigned int count = 0;
next = p_chain->dir;
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
*ret_clu = next + p_chain->size - 1;
return 0;
}
do {
count++;
clu = next;
if (exfat_ent_get(sb, clu, &next))
return -EIO;
} while (next != EXFAT_EOF_CLUSTER);
if (p_chain->size != count) {
exfat_fs_error(sb,
"bogus directory size (clus : ondisk(%d) != counted(%d))",
p_chain->size, count);
return -EIO;
}
*ret_clu = clu;
return 0;
}
|
|
31023864e
exfat: add fat en...
|
230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 |
int exfat_zeroed_cluster(struct inode *dir, unsigned int clu)
{
struct super_block *sb = dir->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
int nr_bhs = MAX_BUF_PER_PAGE;
sector_t blknr, last_blknr;
int err, i, n;
blknr = exfat_cluster_to_sector(sbi, clu);
last_blknr = blknr + sbi->sect_per_clus;
if (last_blknr > sbi->num_sectors && sbi->num_sectors > 0) {
exfat_fs_error_ratelimit(sb,
"%s: out of range(sect:%llu len:%u)",
__func__, (unsigned long long)blknr,
sbi->sect_per_clus);
return -EIO;
}
/* Zeroing the unused blocks on this cluster */
|
|
31023864e
exfat: add fat en...
|
251 |
while (blknr < last_blknr) {
|
|
4dc7d35e0
exfat: optimize e...
|
252 253 254 255 256 |
for (n = 0; n < nr_bhs && blknr < last_blknr; n++, blknr++) {
bhs[n] = sb_getblk(sb, blknr);
if (!bhs[n]) {
err = -ENOMEM;
goto release_bhs;
|
|
31023864e
exfat: add fat en...
|
257 |
} |
|
4dc7d35e0
exfat: optimize e...
|
258 |
memset(bhs[n]->b_data, 0, sb->s_blocksize); |
|
31023864e
exfat: add fat en...
|
259 |
} |
|
31023864e
exfat: add fat en...
|
260 |
|
|
4dc7d35e0
exfat: optimize e...
|
261 |
err = exfat_update_bhs(bhs, n, IS_DIRSYNC(dir)); |
|
31023864e
exfat: add fat en...
|
262 263 |
if (err) goto release_bhs; |
|
31023864e
exfat: add fat en...
|
264 |
|
|
4dc7d35e0
exfat: optimize e...
|
265 266 267 |
for (i = 0; i < n; i++) brelse(bhs[i]); } |
|
31023864e
exfat: add fat en...
|
268 269 270 |
return 0; release_bhs: |
|
d1727d55c
exfat: Use a more...
|
271 272 |
exfat_err(sb, "failed zeroed sect %llu ", (unsigned long long)blknr); |
|
31023864e
exfat: add fat en...
|
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 |
for (i = 0; i < n; i++)
bforget(bhs[i]);
return err;
}
int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
struct exfat_chain *p_chain)
{
int ret = -ENOSPC;
unsigned int num_clusters = 0, total_cnt;
unsigned int hint_clu, new_clu, last_clu = EXFAT_EOF_CLUSTER;
struct super_block *sb = inode->i_sb;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
total_cnt = EXFAT_DATA_CLUSTER_COUNT(sbi);
if (unlikely(total_cnt < sbi->used_clusters)) {
exfat_fs_error_ratelimit(sb,
"%s: invalid used clusters(t:%u,u:%u)
",
__func__, total_cnt, sbi->used_clusters);
return -EIO;
}
if (num_alloc > total_cnt - sbi->used_clusters)
return -ENOSPC;
hint_clu = p_chain->dir;
/* find new cluster */
if (hint_clu == EXFAT_EOF_CLUSTER) {
if (sbi->clu_srch_ptr < EXFAT_FIRST_CLUSTER) {
|
|
d1727d55c
exfat: Use a more...
|
304 305 306 |
exfat_err(sb, "sbi->clu_srch_ptr is invalid (%u) ", sbi->clu_srch_ptr); |
|
31023864e
exfat: add fat en...
|
307 308 309 310 311 312 313 314 315 |
sbi->clu_srch_ptr = EXFAT_FIRST_CLUSTER; } hint_clu = exfat_find_free_bitmap(sb, sbi->clu_srch_ptr); if (hint_clu == EXFAT_EOF_CLUSTER) return -ENOSPC; } /* check cluster validation */ |
|
a949824f0
exfat: fix range ...
|
316 |
if (!is_valid_cluster(sbi, hint_clu)) {
|
|
d1727d55c
exfat: Use a more...
|
317 |
exfat_err(sb, "hint_cluster is invalid (%u)", |
|
31023864e
exfat: add fat en...
|
318 319 320 321 322 323 324 325 326 |
hint_clu);
hint_clu = EXFAT_FIRST_CLUSTER;
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
if (exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters))
return -EIO;
p_chain->flags = ALLOC_FAT_CHAIN;
}
}
|
|
31023864e
exfat: add fat en...
|
327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 |
p_chain->dir = EXFAT_EOF_CLUSTER;
while ((new_clu = exfat_find_free_bitmap(sb, hint_clu)) !=
EXFAT_EOF_CLUSTER) {
if (new_clu != hint_clu &&
p_chain->flags == ALLOC_NO_FAT_CHAIN) {
if (exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters)) {
ret = -EIO;
goto free_cluster;
}
p_chain->flags = ALLOC_FAT_CHAIN;
}
/* update allocation bitmap */
if (exfat_set_bitmap(inode, new_clu)) {
ret = -EIO;
goto free_cluster;
}
num_clusters++;
/* update FAT table */
if (p_chain->flags == ALLOC_FAT_CHAIN) {
if (exfat_ent_set(sb, new_clu, EXFAT_EOF_CLUSTER)) {
ret = -EIO;
goto free_cluster;
}
}
if (p_chain->dir == EXFAT_EOF_CLUSTER) {
p_chain->dir = new_clu;
} else if (p_chain->flags == ALLOC_FAT_CHAIN) {
if (exfat_ent_set(sb, last_clu, new_clu)) {
ret = -EIO;
goto free_cluster;
}
}
last_clu = new_clu;
if (--num_alloc == 0) {
sbi->clu_srch_ptr = hint_clu;
sbi->used_clusters += num_clusters;
p_chain->size += num_clusters;
return 0;
}
hint_clu = new_clu + 1;
if (hint_clu >= sbi->num_clusters) {
hint_clu = EXFAT_FIRST_CLUSTER;
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
if (exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters)) {
ret = -EIO;
goto free_cluster;
}
p_chain->flags = ALLOC_FAT_CHAIN;
}
}
}
free_cluster:
if (num_clusters)
exfat_free_cluster(inode, p_chain);
return ret;
}
int exfat_count_num_clusters(struct super_block *sb,
struct exfat_chain *p_chain, unsigned int *ret_count)
{
unsigned int i, count;
unsigned int clu;
struct exfat_sb_info *sbi = EXFAT_SB(sb);
if (!p_chain->dir || p_chain->dir == EXFAT_EOF_CLUSTER) {
*ret_count = 0;
return 0;
}
if (p_chain->flags == ALLOC_NO_FAT_CHAIN) {
*ret_count = p_chain->size;
return 0;
}
clu = p_chain->dir;
count = 0;
for (i = EXFAT_FIRST_CLUSTER; i < sbi->num_clusters; i++) {
count++;
if (exfat_ent_get(sb, clu, &clu))
return -EIO;
if (clu == EXFAT_EOF_CLUSTER)
break;
}
*ret_count = count;
return 0;
}
|