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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Christoph Hellwigbcd6d4e2007-10-16 23:26:51 -070014#include "ufs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include "swab.h"
16#include "util.h"
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018struct 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;
41failed:
42 for (j = 0; j < i; j++)
43 brelse (ubh->bh[j]);
44 kfree(ubh);
45 return NULL;
46}
47
48struct 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;
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070058 USPI_UBH(uspi)->fragment = fragment;
59 USPI_UBH(uspi)->count = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 for (i = 0; i < count; i++)
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070061 if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 goto failed;
63 for (; i < UFS_MAXFRAG; i++)
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070064 USPI_UBH(uspi)->bh[i] = NULL;
65 return USPI_UBH(uspi);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066failed:
67 for (j = 0; j < i; j++)
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070068 brelse (USPI_UBH(uspi)->bh[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return NULL;
70}
71
72void 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
82void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
83{
84 unsigned i;
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070085 if (!USPI_UBH(uspi))
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 return;
Evgeniy Dushistov9695ef12006-06-25 05:47:22 -070087 for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
88 brelse (USPI_UBH(uspi)->bh[i]);
89 USPI_UBH(uspi)->bh[i] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 }
91}
92
93void 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
102void 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
Evgeniy Dushistov098d5af2006-06-25 05:47:31 -0700116void ubh_ll_rw_block(int rw, struct ufs_buffer_head *ubh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 if (!ubh)
119 return;
Evgeniy Dushistov098d5af2006-06-25 05:47:31 -0700120
121 ll_rw_block(rw, ubh->count, ubh->bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
123
124void 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133void 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
142int 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
153void _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
169void _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
185dev_t
186ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
187{
Al Viro44aa5352006-08-13 01:54:30 -0400188 __u32 fs32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 dev_t dev;
190
191 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
Al Viro44aa5352006-08-13 01:54:30 -0400192 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 else
Al Viro44aa5352006-08-13 01:54:30 -0400194 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 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
212void
213ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
214{
Al Viro44aa5352006-08-13 01:54:30 -0400215 __u32 fs32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
Al Viro44aa5352006-08-13 01:54:30 -0400231 ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 else
Al Viro44aa5352006-08-13 01:54:30 -0400233 ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700235
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
248struct page *ufs_get_locked_page(struct address_space *mapping,
249 pgoff_t index)
250{
251 struct page *page;
252
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700253 page = find_lock_page(mapping, index);
254 if (!page) {
Nick Piggin6fe69002007-05-06 14:49:04 -0700255 page = read_mapping_page(mapping, index, NULL);
Evgeniy Dushistov1fb32b72006-08-05 12:13:55 -0700256
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700257 if (IS_ERR(page)) {
258 printk(KERN_ERR "ufs_change_blocknr: "
Nick Piggin6fe69002007-05-06 14:49:04 -0700259 "read_mapping_page error: ino %lu, index: %lu\n",
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700260 mapping->host->i_ino, index);
261 goto out;
262 }
263
264 lock_page(page);
265
Evgeniy Dushistov1fb32b72006-08-05 12:13:55 -0700266 if (unlikely(page->mapping == NULL)) {
267 /* Truncate got there first */
268 unlock_page(page);
269 page_cache_release(page);
Evgeniy Dushistov06fa45d2006-08-05 12:13:57 -0700270 page = NULL;
271 goto out;
Evgeniy Dushistov1fb32b72006-08-05 12:13:55 -0700272 }
273
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700274 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);
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700283 }
284 }
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700285out:
286 return page;
287}