blob: 95425b59ce0a3582d1279f6484987ea611e4491e [file] [log] [blame]
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/buffer_head.h>
12
Mike Frysingere5420592008-02-08 04:21:31 -080013#include "ufs_fs.h"
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 *)
Arnd Bergmann788257d2011-01-24 10:14:12 +010030 kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 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
Christoph Hellwig9cb569d2010-08-11 17:06:24 +0200116void ubh_sync_block(struct ufs_buffer_head *ubh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
Christoph Hellwig9cb569d2010-08-11 17:06:24 +0200118 if (ubh) {
119 unsigned i;
Evgeniy Dushistov098d5af2006-06-25 05:47:31 -0700120
Christoph Hellwig9cb569d2010-08-11 17:06:24 +0200121 for (i = 0; i < ubh->count; i++)
122 write_dirty_buffer(ubh->bh[i], WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Christoph Hellwig9cb569d2010-08-11 17:06:24 +0200124 for (i = 0; i < ubh->count; i++)
125 wait_on_buffer(ubh->bh[i]);
126 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129void 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
138int 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
149void _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
165void _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
181dev_t
182ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
183{
Al Viro44aa5352006-08-13 01:54:30 -0400184 __u32 fs32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 dev_t dev;
186
187 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
Al Viro44aa5352006-08-13 01:54:30 -0400188 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 else
Al Viro44aa5352006-08-13 01:54:30 -0400190 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 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
208void
209ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
210{
Al Viro44aa5352006-08-13 01:54:30 -0400211 __u32 fs32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
Al Viro44aa5352006-08-13 01:54:30 -0400227 ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 else
Al Viro44aa5352006-08-13 01:54:30 -0400229 ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700231
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
244struct page *ufs_get_locked_page(struct address_space *mapping,
245 pgoff_t index)
246{
247 struct page *page;
248
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700249 page = find_lock_page(mapping, index);
250 if (!page) {
Nick Piggin6fe69002007-05-06 14:49:04 -0700251 page = read_mapping_page(mapping, index, NULL);
Evgeniy Dushistov1fb32b72006-08-05 12:13:55 -0700252
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700253 if (IS_ERR(page)) {
254 printk(KERN_ERR "ufs_change_blocknr: "
Nick Piggin6fe69002007-05-06 14:49:04 -0700255 "read_mapping_page error: ino %lu, index: %lu\n",
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700256 mapping->host->i_ino, index);
257 goto out;
258 }
259
260 lock_page(page);
261
Evgeniy Dushistov1fb32b72006-08-05 12:13:55 -0700262 if (unlikely(page->mapping == NULL)) {
263 /* Truncate got there first */
264 unlock_page(page);
265 page_cache_release(page);
Evgeniy Dushistov06fa45d2006-08-05 12:13:57 -0700266 page = NULL;
267 goto out;
Evgeniy Dushistov1fb32b72006-08-05 12:13:55 -0700268 }
269
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700270 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);
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700279 }
280 }
Evgeniy Dushistov10e5dce2006-07-01 04:36:24 -0700281out:
282 return page;
283}