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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [ufs/] [util.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/*
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 *  linux/fs/ufs/util.c
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 *
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 * Copyright (C) 1998
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 * Daniel Pirkl <daniel.pirkl@email.cz>
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 * Charles University, Faculty of Mathematics and Physics
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 */
8
 
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/ufs_fs.h>
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#include <linux/buffer_head.h>
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#include "ufs.h"
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#include "swab.h"
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#include "util.h"
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struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
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        struct super_block *sb, u64 fragment, u64 size)
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{
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        struct ufs_buffer_head * ubh;
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        unsigned i, j ;
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        u64  count = 0;
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        if (size & ~uspi->s_fmask)
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                return NULL;
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        count = size >> uspi->s_fshift;
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        if (count > UFS_MAXFRAG)
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                return NULL;
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        ubh = (struct ufs_buffer_head *)
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                kmalloc (sizeof (struct ufs_buffer_head), GFP_KERNEL);
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        if (!ubh)
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                return NULL;
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        ubh->fragment = fragment;
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        ubh->count = count;
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        for (i = 0; i < count; i++)
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                if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
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                        goto failed;
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        for (; i < UFS_MAXFRAG; i++)
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                ubh->bh[i] = NULL;
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        return ubh;
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failed:
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        for (j = 0; j < i; j++)
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                brelse (ubh->bh[j]);
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        kfree(ubh);
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        return NULL;
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}
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struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
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        struct super_block *sb, u64 fragment, u64 size)
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{
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        unsigned i, j;
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        u64 count = 0;
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        if (size & ~uspi->s_fmask)
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                return NULL;
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        count = size >> uspi->s_fshift;
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        if (count <= 0 || count > UFS_MAXFRAG)
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                return NULL;
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        USPI_UBH(uspi)->fragment = fragment;
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        USPI_UBH(uspi)->count = count;
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        for (i = 0; i < count; i++)
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                if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
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                        goto failed;
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        for (; i < UFS_MAXFRAG; i++)
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                USPI_UBH(uspi)->bh[i] = NULL;
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        return USPI_UBH(uspi);
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failed:
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        for (j = 0; j < i; j++)
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                brelse (USPI_UBH(uspi)->bh[j]);
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        return NULL;
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}
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void ubh_brelse (struct ufs_buffer_head * ubh)
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{
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        unsigned i;
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        if (!ubh)
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                return;
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        for (i = 0; i < ubh->count; i++)
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                brelse (ubh->bh[i]);
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        kfree (ubh);
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}
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void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
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{
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        unsigned i;
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        if (!USPI_UBH(uspi))
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                return;
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        for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
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                brelse (USPI_UBH(uspi)->bh[i]);
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                USPI_UBH(uspi)->bh[i] = NULL;
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        }
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}
92
 
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void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
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{
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        unsigned i;
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        if (!ubh)
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                return;
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        for ( i = 0; i < ubh->count; i++ )
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                mark_buffer_dirty (ubh->bh[i]);
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}
101
 
102
void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
103
{
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        unsigned i;
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        if (!ubh)
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                return;
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        if (flag) {
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                for ( i = 0; i < ubh->count; i++ )
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                        set_buffer_uptodate (ubh->bh[i]);
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        } else {
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                for ( i = 0; i < ubh->count; i++ )
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                        clear_buffer_uptodate (ubh->bh[i]);
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        }
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}
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;
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        for ( i = 0; i < ubh->count; i++ )
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                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:
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                fs32 = old_encode_dev(dev);
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                break;
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        }
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        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;
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}

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