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
_ubh_bread_(struct ufs_sb_private_info * uspi,struct super_block * sb,u64 fragment,u64 size)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_NOFS);
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
ubh_bread_uspi(struct ufs_sb_private_info * uspi,struct super_block * sb,u64 fragment,u64 size)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
ubh_brelse(struct ufs_buffer_head * ubh)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
ubh_brelse_uspi(struct ufs_sb_private_info * uspi)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
ubh_mark_buffer_dirty(struct ufs_buffer_head * ubh)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
ubh_mark_buffer_uptodate(struct ufs_buffer_head * ubh,int flag)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
ubh_sync_block(struct ufs_buffer_head * ubh)116 void ubh_sync_block(struct ufs_buffer_head *ubh)
117 {
118 if (ubh) {
119 unsigned i;
120
121 for (i = 0; i < ubh->count; i++)
122 write_dirty_buffer(ubh->bh[i], WRITE);
123
124 for (i = 0; i < ubh->count; i++)
125 wait_on_buffer(ubh->bh[i]);
126 }
127 }
128
ubh_bforget(struct ufs_buffer_head * ubh)129 void ubh_bforget (struct ufs_buffer_head * ubh)
130 {
131 unsigned i;
132 if (!ubh)
133 return;
134 for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] )
135 bforget (ubh->bh[i]);
136 }
137
ubh_buffer_dirty(struct ufs_buffer_head * ubh)138 int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
139 {
140 unsigned i;
141 unsigned result = 0;
142 if (!ubh)
143 return 0;
144 for ( i = 0; i < ubh->count; i++ )
145 result |= buffer_dirty(ubh->bh[i]);
146 return result;
147 }
148
_ubh_ubhcpymem_(struct ufs_sb_private_info * uspi,unsigned char * mem,struct ufs_buffer_head * ubh,unsigned size)149 void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi,
150 unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
151 {
152 unsigned len, bhno;
153 if (size > (ubh->count << uspi->s_fshift))
154 size = ubh->count << uspi->s_fshift;
155 bhno = 0;
156 while (size) {
157 len = min_t(unsigned int, size, uspi->s_fsize);
158 memcpy (mem, ubh->bh[bhno]->b_data, len);
159 mem += uspi->s_fsize;
160 size -= len;
161 bhno++;
162 }
163 }
164
_ubh_memcpyubh_(struct ufs_sb_private_info * uspi,struct ufs_buffer_head * ubh,unsigned char * mem,unsigned size)165 void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi,
166 struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
167 {
168 unsigned len, bhno;
169 if (size > (ubh->count << uspi->s_fshift))
170 size = ubh->count << uspi->s_fshift;
171 bhno = 0;
172 while (size) {
173 len = min_t(unsigned int, size, uspi->s_fsize);
174 memcpy (ubh->bh[bhno]->b_data, mem, len);
175 mem += uspi->s_fsize;
176 size -= len;
177 bhno++;
178 }
179 }
180
181 dev_t
ufs_get_inode_dev(struct super_block * sb,struct ufs_inode_info * ufsi)182 ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
183 {
184 __u32 fs32;
185 dev_t dev;
186
187 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
188 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
189 else
190 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
191 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
192 case UFS_ST_SUNx86:
193 case UFS_ST_SUN:
194 if ((fs32 & 0xffff0000) == 0 ||
195 (fs32 & 0xffff0000) == 0xffff0000)
196 dev = old_decode_dev(fs32 & 0x7fff);
197 else
198 dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
199 break;
200
201 default:
202 dev = old_decode_dev(fs32);
203 break;
204 }
205 return dev;
206 }
207
208 void
ufs_set_inode_dev(struct super_block * sb,struct ufs_inode_info * ufsi,dev_t dev)209 ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
210 {
211 __u32 fs32;
212
213 switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
214 case UFS_ST_SUNx86:
215 case UFS_ST_SUN:
216 fs32 = sysv_encode_dev(dev);
217 if ((fs32 & 0xffff8000) == 0) {
218 fs32 = old_encode_dev(dev);
219 }
220 break;
221
222 default:
223 fs32 = old_encode_dev(dev);
224 break;
225 }
226 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
227 ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
228 else
229 ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
230 }
231
232 /**
233 * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
234 * read it from disk.
235 * @mapping: the address_space to search
236 * @index: the page index
237 *
238 * Locates the desired pagecache page, if not exist we'll read it,
239 * locks it, increments its reference
240 * count and returns its address.
241 *
242 */
243
ufs_get_locked_page(struct address_space * mapping,pgoff_t index)244 struct page *ufs_get_locked_page(struct address_space *mapping,
245 pgoff_t index)
246 {
247 struct page *page;
248
249 page = find_lock_page(mapping, index);
250 if (!page) {
251 page = read_mapping_page(mapping, index, NULL);
252
253 if (IS_ERR(page)) {
254 printk(KERN_ERR "ufs_change_blocknr: "
255 "read_mapping_page error: ino %lu, index: %lu\n",
256 mapping->host->i_ino, index);
257 goto out;
258 }
259
260 lock_page(page);
261
262 if (unlikely(page->mapping == NULL)) {
263 /* Truncate got there first */
264 unlock_page(page);
265 page_cache_release(page);
266 page = NULL;
267 goto out;
268 }
269
270 if (!PageUptodate(page) || PageError(page)) {
271 unlock_page(page);
272 page_cache_release(page);
273
274 printk(KERN_ERR "ufs_change_blocknr: "
275 "can not read page: ino %lu, index: %lu\n",
276 mapping->host->i_ino, index);
277
278 page = ERR_PTR(-EIO);
279 }
280 }
281 out:
282 return page;
283 }
284