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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