Merge tag 'fcoe' into for-linus
[linux-2.6-microblaze.git] / fs / ufs / util.c
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 = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS);
30         if (!ubh)
31                 return NULL;
32         ubh->fragment = fragment;
33         ubh->count = count;
34         for (i = 0; i < count; i++)
35                 if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
36                         goto failed;
37         for (; i < UFS_MAXFRAG; i++)
38                 ubh->bh[i] = NULL;
39         return ubh;
40 failed:
41         for (j = 0; j < i; j++)
42                 brelse (ubh->bh[j]);
43         kfree(ubh);
44         return NULL;
45 }
46
47 struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
48         struct super_block *sb, u64 fragment, u64 size)
49 {
50         unsigned i, j;
51         u64 count = 0;
52         if (size & ~uspi->s_fmask)
53                 return NULL;
54         count = size >> uspi->s_fshift;
55         if (count <= 0 || count > UFS_MAXFRAG)
56                 return NULL;
57         USPI_UBH(uspi)->fragment = fragment;
58         USPI_UBH(uspi)->count = count;
59         for (i = 0; i < count; i++)
60                 if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
61                         goto failed;
62         for (; i < UFS_MAXFRAG; i++)
63                 USPI_UBH(uspi)->bh[i] = NULL;
64         return USPI_UBH(uspi);
65 failed:
66         for (j = 0; j < i; j++)
67                 brelse (USPI_UBH(uspi)->bh[j]);
68         return NULL;
69 }
70
71 void ubh_brelse (struct ufs_buffer_head * ubh)
72 {
73         unsigned i;
74         if (!ubh)
75                 return;
76         for (i = 0; i < ubh->count; i++)
77                 brelse (ubh->bh[i]);
78         kfree (ubh);
79 }
80
81 void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
82 {
83         unsigned i;
84         if (!USPI_UBH(uspi))
85                 return;
86         for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
87                 brelse (USPI_UBH(uspi)->bh[i]);
88                 USPI_UBH(uspi)->bh[i] = NULL;
89         }
90 }
91
92 void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
93 {
94         unsigned i;
95         if (!ubh)
96                 return;
97         for ( i = 0; i < ubh->count; i++ )
98                 mark_buffer_dirty (ubh->bh[i]);
99 }
100
101 void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
102 {
103         unsigned i;
104         if (!ubh)
105                 return;
106         if (flag) {
107                 for ( i = 0; i < ubh->count; i++ )
108                         set_buffer_uptodate (ubh->bh[i]);
109         } else {
110                 for ( i = 0; i < ubh->count; i++ )
111                         clear_buffer_uptodate (ubh->bh[i]);
112         }
113 }
114
115 void ubh_sync_block(struct ufs_buffer_head *ubh)
116 {
117         if (ubh) {
118                 unsigned i;
119
120                 for (i = 0; i < ubh->count; i++)
121                         write_dirty_buffer(ubh->bh[i], WRITE);
122
123                 for (i = 0; i < ubh->count; i++)
124                         wait_on_buffer(ubh->bh[i]);
125         }
126 }
127
128 void ubh_bforget (struct ufs_buffer_head * ubh)
129 {
130         unsigned i;
131         if (!ubh) 
132                 return;
133         for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) 
134                 bforget (ubh->bh[i]);
135 }
136  
137 int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
138 {
139         unsigned i;
140         unsigned result = 0;
141         if (!ubh)
142                 return 0;
143         for ( i = 0; i < ubh->count; i++ )
144                 result |= buffer_dirty(ubh->bh[i]);
145         return result;
146 }
147
148 void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, 
149         unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
150 {
151         unsigned len, bhno;
152         if (size > (ubh->count << uspi->s_fshift))
153                 size = ubh->count << uspi->s_fshift;
154         bhno = 0;
155         while (size) {
156                 len = min_t(unsigned int, size, uspi->s_fsize);
157                 memcpy (mem, ubh->bh[bhno]->b_data, len);
158                 mem += uspi->s_fsize;
159                 size -= len;
160                 bhno++;
161         }
162 }
163
164 void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, 
165         struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
166 {
167         unsigned len, bhno;
168         if (size > (ubh->count << uspi->s_fshift))
169                 size = ubh->count << uspi->s_fshift;
170         bhno = 0;
171         while (size) {
172                 len = min_t(unsigned int, size, uspi->s_fsize);
173                 memcpy (ubh->bh[bhno]->b_data, mem, len);
174                 mem += uspi->s_fsize;
175                 size -= len;
176                 bhno++;
177         }
178 }
179
180 dev_t
181 ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
182 {
183         __u32 fs32;
184         dev_t dev;
185
186         if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
187                 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
188         else
189                 fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
190         switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
191         case UFS_ST_SUNx86:
192         case UFS_ST_SUN:
193                 if ((fs32 & 0xffff0000) == 0 ||
194                     (fs32 & 0xffff0000) == 0xffff0000)
195                         dev = old_decode_dev(fs32 & 0x7fff);
196                 else
197                         dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
198                 break;
199
200         default:
201                 dev = old_decode_dev(fs32);
202                 break;
203         }
204         return dev;
205 }
206
207 void
208 ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
209 {
210         __u32 fs32;
211
212         switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
213         case UFS_ST_SUNx86:
214         case UFS_ST_SUN:
215                 fs32 = sysv_encode_dev(dev);
216                 if ((fs32 & 0xffff8000) == 0) {
217                         fs32 = old_encode_dev(dev);
218                 }
219                 break;
220
221         default:
222                 fs32 = old_encode_dev(dev);
223                 break;
224         }
225         if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
226                 ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
227         else
228                 ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
229 }
230
231 /**
232  * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
233  * read it from disk.
234  * @mapping: the address_space to search
235  * @index: the page index
236  *
237  * Locates the desired pagecache page, if not exist we'll read it,
238  * locks it, increments its reference
239  * count and returns its address.
240  *
241  */
242
243 struct page *ufs_get_locked_page(struct address_space *mapping,
244                                  pgoff_t index)
245 {
246         struct page *page;
247
248         page = find_lock_page(mapping, index);
249         if (!page) {
250                 page = read_mapping_page(mapping, index, NULL);
251
252                 if (IS_ERR(page)) {
253                         printk(KERN_ERR "ufs_change_blocknr: "
254                                "read_mapping_page error: ino %lu, index: %lu\n",
255                                mapping->host->i_ino, index);
256                         goto out;
257                 }
258
259                 lock_page(page);
260
261                 if (unlikely(page->mapping == NULL)) {
262                         /* Truncate got there first */
263                         unlock_page(page);
264                         page_cache_release(page);
265                         page = NULL;
266                         goto out;
267                 }
268
269                 if (!PageUptodate(page) || PageError(page)) {
270                         unlock_page(page);
271                         page_cache_release(page);
272
273                         printk(KERN_ERR "ufs_change_blocknr: "
274                                "can not read page: ino %lu, index: %lu\n",
275                                mapping->host->i_ino, index);
276
277                         page = ERR_PTR(-EIO);
278                 }
279         }
280 out:
281         return page;
282 }