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1 | /* |
2 | * linux/fs/ufs/util.c |
3 | * |
4 | * Copyright (C) 1998 |
5 | * Daniel Pirkl <daniel.pirkl@email.cz> |
6 | * Charles University, Faculty of Mathematics and Physics |
7 | */ |
8 | |
9 | #include <linux/string.h> |
10 | #include <linux/slab.h> |
11 | #include <linux/buffer_head.h> |
12 | |
13 | #include "ufs_fs.h" |
14 | #include "ufs.h" |
15 | #include "swab.h" |
16 | #include "util.h" |
17 | |
18 | struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi, |
19 | struct super_block *sb, u64 fragment, u64 size) |
20 | { |
21 | struct ufs_buffer_head * ubh; |
22 | unsigned i, j ; |
23 | u64 count = 0; |
24 | if (size & ~uspi->s_fmask) |
25 | return NULL; |
26 | count = size >> uspi->s_fshift; |
27 | if (count > UFS_MAXFRAG) |
28 | return NULL; |
29 | ubh = (struct ufs_buffer_head *) |
30 | kmalloc (sizeof (struct ufs_buffer_head), GFP_KERNEL); |
31 | if (!ubh) |
32 | return NULL; |
33 | ubh->fragment = fragment; |
34 | ubh->count = count; |
35 | for (i = 0; i < count; i++) |
36 | if (!(ubh->bh[i] = sb_bread(sb, fragment + i))) |
37 | goto failed; |
38 | for (; i < UFS_MAXFRAG; i++) |
39 | ubh->bh[i] = NULL; |
40 | return ubh; |
41 | failed: |
42 | for (j = 0; j < i; j++) |
43 | brelse (ubh->bh[j]); |
44 | kfree(ubh); |
45 | return NULL; |
46 | } |
47 | |
48 | struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi, |
49 | struct super_block *sb, u64 fragment, u64 size) |
50 | { |
51 | unsigned i, j; |
52 | u64 count = 0; |
53 | if (size & ~uspi->s_fmask) |
54 | return NULL; |
55 | count = size >> uspi->s_fshift; |
56 | if (count <= 0 || count > UFS_MAXFRAG) |
57 | return NULL; |
58 | USPI_UBH(uspi)->fragment = fragment; |
59 | USPI_UBH(uspi)->count = count; |
60 | for (i = 0; i < count; i++) |
61 | if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i))) |
62 | goto failed; |
63 | for (; i < UFS_MAXFRAG; i++) |
64 | USPI_UBH(uspi)->bh[i] = NULL; |
65 | return USPI_UBH(uspi); |
66 | failed: |
67 | for (j = 0; j < i; j++) |
68 | brelse (USPI_UBH(uspi)->bh[j]); |
69 | return NULL; |
70 | } |
71 | |
72 | void ubh_brelse (struct ufs_buffer_head * ubh) |
73 | { |
74 | unsigned i; |
75 | if (!ubh) |
76 | return; |
77 | for (i = 0; i < ubh->count; i++) |
78 | brelse (ubh->bh[i]); |
79 | kfree (ubh); |
80 | } |
81 | |
82 | void ubh_brelse_uspi (struct ufs_sb_private_info * uspi) |
83 | { |
84 | unsigned i; |
85 | if (!USPI_UBH(uspi)) |
86 | return; |
87 | for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) { |
88 | brelse (USPI_UBH(uspi)->bh[i]); |
89 | USPI_UBH(uspi)->bh[i] = NULL; |
90 | } |
91 | } |
92 | |
93 | void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh) |
94 | { |
95 | unsigned i; |
96 | if (!ubh) |
97 | return; |
98 | for ( i = 0; i < ubh->count; i++ ) |
99 | mark_buffer_dirty (ubh->bh[i]); |
100 | } |
101 | |
102 | void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag) |
103 | { |
104 | unsigned i; |
105 | if (!ubh) |
106 | return; |
107 | if (flag) { |
108 | for ( i = 0; i < ubh->count; i++ ) |
109 | set_buffer_uptodate (ubh->bh[i]); |
110 | } else { |
111 | for ( i = 0; i < ubh->count; i++ ) |
112 | clear_buffer_uptodate (ubh->bh[i]); |
113 | } |
114 | } |
115 | |
116 | void ubh_ll_rw_block(int rw, struct ufs_buffer_head *ubh) |
117 | { |
118 | if (!ubh) |
119 | return; |
120 | |
121 | ll_rw_block(rw, ubh->count, ubh->bh); |
122 | } |
123 | |
124 | void ubh_wait_on_buffer (struct ufs_buffer_head * ubh) |
125 | { |
126 | unsigned i; |
127 | if (!ubh) |
128 | return; |
129 | for ( i = 0; i < ubh->count; i++ ) |
130 | wait_on_buffer (ubh->bh[i]); |
131 | } |
132 | |
133 | void ubh_bforget (struct ufs_buffer_head * ubh) |
134 | { |
135 | unsigned i; |
136 | if (!ubh) |
137 | return; |
138 | for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) |
139 | bforget (ubh->bh[i]); |
140 | } |
141 | |
142 | int ubh_buffer_dirty (struct ufs_buffer_head * ubh) |
143 | { |
144 | unsigned i; |
145 | unsigned result = 0; |
146 | if (!ubh) |
147 | return 0; |
148 | for ( i = 0; i < ubh->count; i++ ) |
149 | result |= buffer_dirty(ubh->bh[i]); |
150 | return result; |
151 | } |
152 | |
153 | void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, |
154 | unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size) |
155 | { |
156 | unsigned len, bhno; |
157 | if (size > (ubh->count << uspi->s_fshift)) |
158 | size = ubh->count << uspi->s_fshift; |
159 | bhno = 0; |
160 | while (size) { |
161 | len = min_t(unsigned int, size, uspi->s_fsize); |
162 | memcpy (mem, ubh->bh[bhno]->b_data, len); |
163 | mem += uspi->s_fsize; |
164 | size -= len; |
165 | bhno++; |
166 | } |
167 | } |
168 | |
169 | void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, |
170 | struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size) |
171 | { |
172 | unsigned len, bhno; |
173 | if (size > (ubh->count << uspi->s_fshift)) |
174 | size = ubh->count << uspi->s_fshift; |
175 | bhno = 0; |
176 | while (size) { |
177 | len = min_t(unsigned int, size, uspi->s_fsize); |
178 | memcpy (ubh->bh[bhno]->b_data, mem, len); |
179 | mem += uspi->s_fsize; |
180 | size -= len; |
181 | bhno++; |
182 | } |
183 | } |
184 | |
185 | dev_t |
186 | ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi) |
187 | { |
188 | __u32 fs32; |
189 | dev_t dev; |
190 | |
191 | if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) |
192 | fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]); |
193 | else |
194 | fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]); |
195 | switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { |
196 | case UFS_ST_SUNx86: |
197 | case UFS_ST_SUN: |
198 | if ((fs32 & 0xffff0000) == 0 || |
199 | (fs32 & 0xffff0000) == 0xffff0000) |
200 | dev = old_decode_dev(fs32 & 0x7fff); |
201 | else |
202 | dev = MKDEV(sysv_major(fs32), sysv_minor(fs32)); |
203 | break; |
204 | |
205 | default: |
206 | dev = old_decode_dev(fs32); |
207 | break; |
208 | } |
209 | return dev; |
210 | } |
211 | |
212 | void |
213 | ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev) |
214 | { |
215 | __u32 fs32; |
216 | |
217 | switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { |
218 | case UFS_ST_SUNx86: |
219 | case UFS_ST_SUN: |
220 | fs32 = sysv_encode_dev(dev); |
221 | if ((fs32 & 0xffff8000) == 0) { |
222 | fs32 = old_encode_dev(dev); |
223 | } |
224 | break; |
225 | |
226 | default: |
227 | fs32 = old_encode_dev(dev); |
228 | break; |
229 | } |
230 | if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) |
231 | ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32); |
232 | else |
233 | ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32); |
234 | } |
235 | |
236 | /** |
237 | * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist |
238 | * read it from disk. |
239 | * @mapping: the address_space to search |
240 | * @index: the page index |
241 | * |
242 | * Locates the desired pagecache page, if not exist we'll read it, |
243 | * locks it, increments its reference |
244 | * count and returns its address. |
245 | * |
246 | */ |
247 | |
248 | struct page *ufs_get_locked_page(struct address_space *mapping, |
249 | pgoff_t index) |
250 | { |
251 | struct page *page; |
252 | |
253 | page = find_lock_page(mapping, index); |
254 | if (!page) { |
255 | page = read_mapping_page(mapping, index, NULL); |
256 | |
257 | if (IS_ERR(page)) { |
258 | printk(KERN_ERR "ufs_change_blocknr: " |
259 | "read_mapping_page error: ino %lu, index: %lu\n", |
260 | mapping->host->i_ino, index); |
261 | goto out; |
262 | } |
263 | |
264 | lock_page(page); |
265 | |
266 | if (unlikely(page->mapping == NULL)) { |
267 | /* Truncate got there first */ |
268 | unlock_page(page); |
269 | page_cache_release(page); |
270 | page = NULL; |
271 | goto out; |
272 | } |
273 | |
274 | if (!PageUptodate(page) || PageError(page)) { |
275 | unlock_page(page); |
276 | page_cache_release(page); |
277 | |
278 | printk(KERN_ERR "ufs_change_blocknr: " |
279 | "can not read page: ino %lu, index: %lu\n", |
280 | mapping->host->i_ino, index); |
281 | |
282 | page = ERR_PTR(-EIO); |
283 | } |
284 | } |
285 | out: |
286 | return page; |
287 | } |
288 |
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