1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * Copyright (C) 2012-2013 Samsung Electronic
4 */
5
6 #include <linux/blkdev.h>
7 #include <linux/slab.h>
8 #include <linux/bitmap.h>
9 #include <linux/buffer_head.h>
10
11 #include "exfat_raw.h"
12 #include "exfat_fs.h"
13
14 #if BITS_PER_LONG == 32
15 #define __le_long __le32
16 #define lel_to_cpu(A) le32_to_cpu(A)
17 #define cpu_to_lel(A) cpu_to_le32(A)
18 #elif BITS_PER_LONG == 64
19 #define __le_long __le64
20 #define lel_to_cpu(A) le64_to_cpu(A)
21 #define cpu_to_lel(A) cpu_to_le64(A)
22 #else
23 #error "BITS_PER_LONG not 32 or 64"
24 #endif
25
26 /*
27 * Allocation Bitmap Management Functions
28 */
29 static int exfat_allocate_bitmap(struct super_
30 struct exfat_dentry *ep)
31 {
32 struct exfat_sb_info *sbi = EXFAT_SB(s
33 long long map_size;
34 unsigned int i, need_map_size;
35 sector_t sector;
36
37 sbi->map_clu = le32_to_cpu(ep->dentry.
38 map_size = le64_to_cpu(ep->dentry.bitm
39 need_map_size = ((EXFAT_DATA_CLUSTER_C
40 + 1;
41 if (need_map_size != map_size) {
42 exfat_err(sb, "bogus allocatio
43 need_map_size, map_s
44 /*
45 * Only allowed when bogus all
46 * bitmap size is large
47 */
48 if (need_map_size > map_size)
49 return -EIO;
50 }
51 sbi->map_sectors = ((need_map_size - 1
52 (sb->s_blocksize_bits)
53 sbi->vol_amap = kvmalloc_array(sbi->ma
54 sizeof(struct
55 if (!sbi->vol_amap)
56 return -ENOMEM;
57
58 sector = exfat_cluster_to_sector(sbi,
59 for (i = 0; i < sbi->map_sectors; i++)
60 sbi->vol_amap[i] = sb_bread(sb
61 if (!sbi->vol_amap[i]) {
62 /* release all buffers
63 int j = 0;
64
65 while (j < i)
66 brelse(sbi->vo
67
68 kvfree(sbi->vol_amap);
69 sbi->vol_amap = NULL;
70 return -EIO;
71 }
72 }
73
74 return 0;
75 }
76
77 int exfat_load_bitmap(struct super_block *sb)
78 {
79 unsigned int i, type;
80 struct exfat_chain clu;
81 struct exfat_sb_info *sbi = EXFAT_SB(s
82
83 exfat_chain_set(&clu, sbi->root_dir, 0
84 while (clu.dir != EXFAT_EOF_CLUSTER) {
85 for (i = 0; i < sbi->dentries_
86 struct exfat_dentry *e
87 struct buffer_head *bh
88
89 ep = exfat_get_dentry(
90 if (!ep)
91 return -EIO;
92
93 type = exfat_get_entry
94 if (type == TYPE_BITMA
95 ep->dentry.bitmap.
96 int err;
97
98 err = exfat_al
99 brelse(bh);
100 return err;
101 }
102 brelse(bh);
103
104 if (type == TYPE_UNUSE
105 return -EINVAL
106 }
107
108 if (exfat_get_next_cluster(sb,
109 return -EIO;
110 }
111
112 return -EINVAL;
113 }
114
115 void exfat_free_bitmap(struct exfat_sb_info *s
116 {
117 int i;
118
119 for (i = 0; i < sbi->map_sectors; i++)
120 __brelse(sbi->vol_amap[i]);
121
122 kvfree(sbi->vol_amap);
123 }
124
125 int exfat_set_bitmap(struct inode *inode, unsi
126 {
127 int i, b;
128 unsigned int ent_idx;
129 struct super_block *sb = inode->i_sb;
130 struct exfat_sb_info *sbi = EXFAT_SB(s
131
132 if (!is_valid_cluster(sbi, clu))
133 return -EINVAL;
134
135 ent_idx = CLUSTER_TO_BITMAP_ENT(clu);
136 i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent
137 b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, en
138
139 set_bit_le(b, sbi->vol_amap[i]->b_data
140 exfat_update_bh(sbi->vol_amap[i], sync
141 return 0;
142 }
143
144 void exfat_clear_bitmap(struct inode *inode, u
145 {
146 int i, b;
147 unsigned int ent_idx;
148 struct super_block *sb = inode->i_sb;
149 struct exfat_sb_info *sbi = EXFAT_SB(s
150 struct exfat_mount_options *opts = &sb
151
152 if (!is_valid_cluster(sbi, clu))
153 return;
154
155 ent_idx = CLUSTER_TO_BITMAP_ENT(clu);
156 i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent
157 b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, en
158
159 clear_bit_le(b, sbi->vol_amap[i]->b_da
160 exfat_update_bh(sbi->vol_amap[i], sync
161
162 if (opts->discard) {
163 int ret_discard;
164
165 ret_discard = sb_issue_discard
166 exfat_cluster_to_secto
167 (1 << sbi->sect_per_cl
168
169 if (ret_discard == -EOPNOTSUPP
170 exfat_err(sb, "discard
171 opts->discard = 0;
172 }
173 }
174 }
175
176 /*
177 * If the value of "clu" is 0, it means cluste
178 * the cluster heap.
179 */
180 unsigned int exfat_find_free_bitmap(struct sup
181 {
182 unsigned int i, map_i, map_b, ent_idx;
183 unsigned int clu_base, clu_free;
184 unsigned long clu_bits, clu_mask;
185 struct exfat_sb_info *sbi = EXFAT_SB(s
186 __le_long bitval;
187
188 WARN_ON(clu < EXFAT_FIRST_CLUSTER);
189 ent_idx = ALIGN_DOWN(CLUSTER_TO_BITMAP
190 clu_base = BITMAP_ENT_TO_CLUSTER(ent_i
191 clu_mask = IGNORED_BITS_REMAINED(clu,
192
193 map_i = BITMAP_OFFSET_SECTOR_INDEX(sb,
194 map_b = BITMAP_OFFSET_BYTE_IN_SECTOR(s
195
196 for (i = EXFAT_FIRST_CLUSTER; i < sbi-
197 i += BITS_PER_LONG) {
198 bitval = *(__le_long *)(sbi->v
199 if (clu_mask > 0) {
200 bitval |= cpu_to_lel(c
201 clu_mask = 0;
202 }
203 if (lel_to_cpu(bitval) != ULON
204 clu_bits = lel_to_cpu(
205 clu_free = clu_base +
206 if (clu_free < sbi->nu
207 return clu_fre
208 }
209 clu_base += BITS_PER_LONG;
210 map_b += sizeof(long);
211
212 if (map_b >= sb->s_blocksize |
213 clu_base >= sbi->num_clust
214 if (++map_i >= sbi->ma
215 clu_base = EXF
216 map_i = 0;
217 }
218 map_b = 0;
219 }
220 }
221
222 return EXFAT_EOF_CLUSTER;
223 }
224
225 int exfat_count_used_clusters(struct super_blo
226 {
227 struct exfat_sb_info *sbi = EXFAT_SB(s
228 unsigned int count = 0;
229 unsigned int i, map_i = 0, map_b = 0;
230 unsigned int total_clus = EXFAT_DATA_C
231 unsigned int last_mask = total_clus &
232 unsigned long *bitmap, clu_bits;
233
234 total_clus &= ~last_mask;
235 for (i = 0; i < total_clus; i += BITS_
236 bitmap = (void *)(sbi->vol_ama
237 count += hweight_long(*bitmap)
238 map_b += sizeof(long);
239 if (map_b >= (unsigned int)sb-
240 map_i++;
241 map_b = 0;
242 }
243 }
244
245 if (last_mask) {
246 bitmap = (void *)(sbi->vol_ama
247 clu_bits = lel_to_cpu(*(__le_l
248 count += hweight_long(clu_bits
249 }
250
251 *ret_count = count;
252 return 0;
253 }
254
255 int exfat_trim_fs(struct inode *inode, struct
256 {
257 unsigned int trim_begin, trim_end, cou
258 u64 clu_start, clu_end, trim_minlen, t
259 struct super_block *sb = inode->i_sb;
260 struct exfat_sb_info *sbi = EXFAT_SB(s
261 int err = 0;
262
263 clu_start = max_t(u64, range->start >>
264 EXFAT_FIRST_CL
265 clu_end = clu_start + (range->len >> s
266 trim_minlen = range->minlen >> sbi->cl
267
268 if (clu_start >= sbi->num_clusters ||
269 return -EINVAL;
270
271 if (clu_end >= sbi->num_clusters)
272 clu_end = sbi->num_clusters -
273
274 mutex_lock(&sbi->bitmap_lock);
275
276 trim_begin = trim_end = exfat_find_fre
277 if (trim_begin == EXFAT_EOF_CLUSTER)
278 goto unlock;
279
280 next_free_clu = exfat_find_free_bitmap
281 if (next_free_clu == EXFAT_EOF_CLUSTER
282 goto unlock;
283
284 do {
285 if (next_free_clu == trim_end
286 /* extend trim range f
287 trim_end++;
288 } else {
289 /* trim current range
290 count = trim_end - tri
291 if (count >= trim_minl
292 err = sb_issue
293 exfat_
294 count
295 if (err)
296 goto u
297
298 trimmed_total
299 }
300
301 /* set next start poin
302 trim_begin = trim_end
303 }
304
305 if (next_free_clu >= clu_end)
306 break;
307
308 if (fatal_signal_pending(curre
309 err = -ERESTARTSYS;
310 goto unlock;
311 }
312
313 next_free_clu = exfat_find_fre
314 } while (next_free_clu != EXFAT_EOF_CL
315 next_free_clu > trim_e
316
317 /* try to trim remainder */
318 count = trim_end - trim_begin + 1;
319 if (count >= trim_minlen) {
320 err = sb_issue_discard(sb, exf
321 count * sbi->sect_per_
322 if (err)
323 goto unlock;
324
325 trimmed_total += count;
326 }
327
328 unlock:
329 mutex_unlock(&sbi->bitmap_lock);
330 range->len = trimmed_total << sbi->clu
331
332 return err;
333 }
334
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