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1da177e4 LT |
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/ufs_fs.h> | |
12 | #include <linux/buffer_head.h> | |
13 | ||
14 | #include "swab.h" | |
15 | #include "util.h" | |
16 | ||
17 | #undef UFS_UTILS_DEBUG | |
18 | ||
19 | #ifdef UFS_UTILS_DEBUG | |
20 | #define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x; | |
21 | #else | |
22 | #define UFSD(x) | |
23 | #endif | |
24 | ||
25 | ||
26 | struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi, | |
27 | struct super_block *sb, u64 fragment, u64 size) | |
28 | { | |
29 | struct ufs_buffer_head * ubh; | |
30 | unsigned i, j ; | |
31 | u64 count = 0; | |
32 | if (size & ~uspi->s_fmask) | |
33 | return NULL; | |
34 | count = size >> uspi->s_fshift; | |
35 | if (count > UFS_MAXFRAG) | |
36 | return NULL; | |
37 | ubh = (struct ufs_buffer_head *) | |
38 | kmalloc (sizeof (struct ufs_buffer_head), GFP_KERNEL); | |
39 | if (!ubh) | |
40 | return NULL; | |
41 | ubh->fragment = fragment; | |
42 | ubh->count = count; | |
43 | for (i = 0; i < count; i++) | |
44 | if (!(ubh->bh[i] = sb_bread(sb, fragment + i))) | |
45 | goto failed; | |
46 | for (; i < UFS_MAXFRAG; i++) | |
47 | ubh->bh[i] = NULL; | |
48 | return ubh; | |
49 | failed: | |
50 | for (j = 0; j < i; j++) | |
51 | brelse (ubh->bh[j]); | |
52 | kfree(ubh); | |
53 | return NULL; | |
54 | } | |
55 | ||
56 | struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi, | |
57 | struct super_block *sb, u64 fragment, u64 size) | |
58 | { | |
59 | unsigned i, j; | |
60 | u64 count = 0; | |
61 | if (size & ~uspi->s_fmask) | |
62 | return NULL; | |
63 | count = size >> uspi->s_fshift; | |
64 | if (count <= 0 || count > UFS_MAXFRAG) | |
65 | return NULL; | |
66 | USPI_UBH->fragment = fragment; | |
67 | USPI_UBH->count = count; | |
68 | for (i = 0; i < count; i++) | |
69 | if (!(USPI_UBH->bh[i] = sb_bread(sb, fragment + i))) | |
70 | goto failed; | |
71 | for (; i < UFS_MAXFRAG; i++) | |
72 | USPI_UBH->bh[i] = NULL; | |
73 | return USPI_UBH; | |
74 | failed: | |
75 | for (j = 0; j < i; j++) | |
76 | brelse (USPI_UBH->bh[j]); | |
77 | return NULL; | |
78 | } | |
79 | ||
80 | void ubh_brelse (struct ufs_buffer_head * ubh) | |
81 | { | |
82 | unsigned i; | |
83 | if (!ubh) | |
84 | return; | |
85 | for (i = 0; i < ubh->count; i++) | |
86 | brelse (ubh->bh[i]); | |
87 | kfree (ubh); | |
88 | } | |
89 | ||
90 | void ubh_brelse_uspi (struct ufs_sb_private_info * uspi) | |
91 | { | |
92 | unsigned i; | |
93 | if (!USPI_UBH) | |
94 | return; | |
95 | for ( i = 0; i < USPI_UBH->count; i++ ) { | |
96 | brelse (USPI_UBH->bh[i]); | |
97 | USPI_UBH->bh[i] = NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh) | |
102 | { | |
103 | unsigned i; | |
104 | if (!ubh) | |
105 | return; | |
106 | for ( i = 0; i < ubh->count; i++ ) | |
107 | mark_buffer_dirty (ubh->bh[i]); | |
108 | } | |
109 | ||
110 | void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag) | |
111 | { | |
112 | unsigned i; | |
113 | if (!ubh) | |
114 | return; | |
115 | if (flag) { | |
116 | for ( i = 0; i < ubh->count; i++ ) | |
117 | set_buffer_uptodate (ubh->bh[i]); | |
118 | } else { | |
119 | for ( i = 0; i < ubh->count; i++ ) | |
120 | clear_buffer_uptodate (ubh->bh[i]); | |
121 | } | |
122 | } | |
123 | ||
124 | void ubh_ll_rw_block (int rw, unsigned nr, struct ufs_buffer_head * ubh[]) | |
125 | { | |
126 | unsigned i; | |
127 | if (!ubh) | |
128 | return; | |
129 | for ( i = 0; i < nr; i++ ) | |
130 | ll_rw_block (rw, ubh[i]->count, ubh[i]->bh); | |
131 | } | |
132 | ||
133 | void ubh_wait_on_buffer (struct ufs_buffer_head * ubh) | |
134 | { | |
135 | unsigned i; | |
136 | if (!ubh) | |
137 | return; | |
138 | for ( i = 0; i < ubh->count; i++ ) | |
139 | wait_on_buffer (ubh->bh[i]); | |
140 | } | |
141 | ||
1da177e4 LT |
142 | void ubh_bforget (struct ufs_buffer_head * ubh) |
143 | { | |
144 | unsigned i; | |
145 | if (!ubh) | |
146 | return; | |
147 | for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) | |
148 | bforget (ubh->bh[i]); | |
149 | } | |
150 | ||
151 | int ubh_buffer_dirty (struct ufs_buffer_head * ubh) | |
152 | { | |
153 | unsigned i; | |
154 | unsigned result = 0; | |
155 | if (!ubh) | |
156 | return 0; | |
157 | for ( i = 0; i < ubh->count; i++ ) | |
158 | result |= buffer_dirty(ubh->bh[i]); | |
159 | return result; | |
160 | } | |
161 | ||
162 | void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, | |
163 | unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size) | |
164 | { | |
165 | unsigned len, bhno; | |
166 | if (size > (ubh->count << uspi->s_fshift)) | |
167 | size = ubh->count << uspi->s_fshift; | |
168 | bhno = 0; | |
169 | while (size) { | |
170 | len = min_t(unsigned int, size, uspi->s_fsize); | |
171 | memcpy (mem, ubh->bh[bhno]->b_data, len); | |
172 | mem += uspi->s_fsize; | |
173 | size -= len; | |
174 | bhno++; | |
175 | } | |
176 | } | |
177 | ||
178 | void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, | |
179 | struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size) | |
180 | { | |
181 | unsigned len, bhno; | |
182 | if (size > (ubh->count << uspi->s_fshift)) | |
183 | size = ubh->count << uspi->s_fshift; | |
184 | bhno = 0; | |
185 | while (size) { | |
186 | len = min_t(unsigned int, size, uspi->s_fsize); | |
187 | memcpy (ubh->bh[bhno]->b_data, mem, len); | |
188 | mem += uspi->s_fsize; | |
189 | size -= len; | |
190 | bhno++; | |
191 | } | |
192 | } | |
193 | ||
194 | dev_t | |
195 | ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi) | |
196 | { | |
197 | __fs32 fs32; | |
198 | dev_t dev; | |
199 | ||
200 | if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) | |
201 | fs32 = ufsi->i_u1.i_data[1]; | |
202 | else | |
203 | fs32 = ufsi->i_u1.i_data[0]; | |
204 | fs32 = fs32_to_cpu(sb, fs32); | |
205 | switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { | |
206 | case UFS_ST_SUNx86: | |
207 | case UFS_ST_SUN: | |
208 | if ((fs32 & 0xffff0000) == 0 || | |
209 | (fs32 & 0xffff0000) == 0xffff0000) | |
210 | dev = old_decode_dev(fs32 & 0x7fff); | |
211 | else | |
212 | dev = MKDEV(sysv_major(fs32), sysv_minor(fs32)); | |
213 | break; | |
214 | ||
215 | default: | |
216 | dev = old_decode_dev(fs32); | |
217 | break; | |
218 | } | |
219 | return dev; | |
220 | } | |
221 | ||
222 | void | |
223 | ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev) | |
224 | { | |
225 | __fs32 fs32; | |
226 | ||
227 | switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) { | |
228 | case UFS_ST_SUNx86: | |
229 | case UFS_ST_SUN: | |
230 | fs32 = sysv_encode_dev(dev); | |
231 | if ((fs32 & 0xffff8000) == 0) { | |
232 | fs32 = old_encode_dev(dev); | |
233 | } | |
234 | break; | |
235 | ||
236 | default: | |
237 | fs32 = old_encode_dev(dev); | |
238 | break; | |
239 | } | |
240 | fs32 = cpu_to_fs32(sb, fs32); | |
241 | if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86) | |
242 | ufsi->i_u1.i_data[1] = fs32; | |
243 | else | |
244 | ufsi->i_u1.i_data[0] = fs32; | |
245 | } |