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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [affs/] [amigaffs.c] - Blame information for rev 1777

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Line No. Rev Author Line
1 1628 jcastillo 
/*
2 
 *  linux/fs/affs/amigaffs.c
3 
 *
4 
 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
5 
 *
6 
 *  (C) 1993  Ray Burr - Amiga FFS filesystem.
7 
 *
8 
 */
9 
 
10 
#include <linux/stat.h>
11 
#include <linux/sched.h>
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#include <linux/affs_fs.h>
13 
#include <linux/string.h>
14 
#include <linux/locks.h>
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#include <linux/mm.h>
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#include <linux/amigaffs.h>
17 
 
18 
extern struct timezone sys_tz;
19 
 
20 
/*
21 
 * Functions for accessing Amiga-FFS structures.
22 
 *
23 
 */
24 
 
25 
/* Find the next used hash entry at or after *HASH_POS in a directory's hash
26 
   table.  *HASH_POS is assigned that entry's number.  DIR_DATA points to
27 
   the directory header block in memory.  If there are no more entries,
28 
 
29 
   is returned. */
30 
 
31 
int
32 
affs_find_next_hash_entry(int hsize, void *dir_data, int *hash_pos)
33 
{
34 
        struct dir_front *dir_front = dir_data;
35 
        int i;
36 
 
37 
        for (i = *hash_pos; i < hsize; i++)
38 
                if (dir_front->hashtable[i] != 0)
39 
                        break;
40 
        if (i >= hsize)
41 
                return 0;
42 
        *hash_pos = i;
43 
        return htonl(dir_front->hashtable[i]);
44 
}
45 
 
46 
/* Set *NAME to point to the file name in a file header block in memory
47 
   pointed to by FH_DATA.  The length of the name is returned. */
48 
 
49 
int
50 
affs_get_file_name(int bsize, void *fh_data, char **name)
51 
{
52 
        struct file_end *file_end;
53 
 
54 
        file_end = GET_END_PTR(struct file_end, fh_data, bsize);
55 
        if (file_end->file_name[0] == 0
56 
            || file_end->file_name[0] > 30) {
57 
                printk ("affs_get_file_name: OOPS! bad filename\n");
58 
                printk ("  file_end->file_name[0] = %d\n",
59 
                        file_end->file_name[0]);
60 
                *name = "***BAD_FILE***";
61 
                return 14;
62 
        }
63 
        *name = (char *) &file_end->file_name[1];
64 
        return file_end->file_name[0];
65 
}
66 
 
67 
/* Find the predecessor in the hash chain */
68 
 
69 
int
70 
affs_fix_hash_pred(struct inode *startino, int startoffset, int key, int newkey)
71 
{
72 
        struct buffer_head      *bh = NULL;
73 
        int                      nextkey;
74 
        int                      ptype, stype;
75 
        int                      retval;
76 
 
77 
        nextkey = startino->i_ino;
78 
        retval  = -ENOENT;
79 
        lock_super(startino->i_sb);
80 
        while (1) {
81 
                pr_debug("AFFS: fix_hash_pred(): next key=%d, offset=%d\n",nextkey,startoffset);
82 
                if (nextkey == 0)
83 
                        break;
84 
                if (!(bh = affs_bread(startino->i_dev,nextkey,AFFS_I2BSIZE(startino))))
85 
                        break;
86 
                if (affs_checksum_block(AFFS_I2BSIZE(startino),bh->b_data,&ptype,&stype)
87 
                    || ptype != T_SHORT || (stype != ST_FILE && stype != ST_USERDIR &&
88 
                                            stype != ST_LINKFILE && stype != ST_LINKDIR &&
89 
                                            stype != ST_ROOT && stype != ST_SOFTLINK)) {
90 
                        printk("AFFS: bad block found in link chain (ptype=%d, stype=%d)\n",
91 
                               ptype,stype);
92 
                        affs_brelse(bh);
93 
                        break;
94 
                }
95 
                nextkey = htonl(((__u32 *)bh->b_data)[startoffset]);
96 
                if (nextkey == key) {
97 
                        ((__u32 *)bh->b_data)[startoffset] = newkey;
98 
                        affs_fix_checksum(AFFS_I2BSIZE(startino),bh->b_data,5);
99 
                        mark_buffer_dirty(bh,1);
100 
                        affs_brelse(bh);
101 
                        retval = 0;
102 
                        break;
103 
                }
104 
                affs_brelse(bh);
105 
                startoffset = AFFS_I2BSIZE(startino) / 4 - 4;
106 
        }
107 
        unlock_super(startino->i_sb);
108 
 
109 
        return retval;
110 
}
111 
 
112 
/* Remove inode from link chain */
113 
 
114 
int
115 
affs_fix_link_pred(struct inode *startino, int key, int newkey)
116 
{
117 
        struct buffer_head      *bh = NULL;
118 
        int                      nextkey;
119 
        int                      offset;
120 
        int                      etype = 0;
121 
        int                      ptype, stype;
122 
        int                      retval;
123 
 
124 
        offset  = AFFS_I2BSIZE(startino) / 4 - 10;
125 
        nextkey = startino->i_ino;
126 
        retval  = -ENOENT;
127 
        lock_super(startino->i_sb);
128 
        while (1) {
129 
                if (nextkey == 0)
130 
                        break;
131 
                pr_debug("AFFS: find_link_pred(): next key=%d\n",nextkey);
132 
                if (!(bh = affs_bread(startino->i_dev,nextkey,AFFS_I2BSIZE(startino))))
133 
                        break;
134 
                if (affs_checksum_block(AFFS_I2BSIZE(startino),bh->b_data,&ptype,&stype)
135 
                    || ptype != T_SHORT) {
136 
                        affs_brelse(bh);
137 
                        break;
138 
                }
139 
                if (!etype) {
140 
                        if (stype != ST_FILE && stype != ST_USERDIR) {
141 
                                affs_brelse(bh);
142 
                                break;
143 
                        }
144 
                        if (stype == ST_FILE)
145 
                                etype = ST_LINKFILE;
146 
                        else
147 
                                etype = ST_LINKDIR;
148 
                } else if (stype != etype) {
149 
                        affs_brelse(bh);
150 
                        retval = -EPERM;
151 
                        break;
152 
                }
153 
                nextkey = htonl(((__u32 *)bh->b_data)[offset]);
154 
                if (nextkey == key) {
155 
                        FILE_END(bh->b_data,startino)->link_chain = newkey;
156 
                        affs_fix_checksum(AFFS_I2BSIZE(startino),bh->b_data,5);
157 
                        mark_buffer_dirty(bh,1);
158 
                        affs_brelse(bh);
159 
                        retval = 0;
160 
                        break;
161 
                }
162 
                affs_brelse(bh);
163 
        }
164 
        unlock_super(startino->i_sb);
165 
        return retval;
166 
}
167 
 
168 
/* Checksum a block, do various consistency checks and optionally return
169 
   the blocks type number.  DATA points to the block.  If their pointers
170 
   are non-null, *PTYPE and *STYPE are set to the primary and secondary
171 
   block types respectively, *HASHSIZE is set to the size of the hashtable
172 
   (which lets us calculate the block size).
173 
   Returns non-zero if the block is not consistent. */
174 
 
175 
__u32
176 
affs_checksum_block(int bsize, void *data, int *ptype, int *stype)
177 
{
178 
        __u32    sum;
179 
        __u32   *p;
180 
 
181 
        bsize /= 4;
182 
        if (ptype)
183 
                *ptype = htonl(((__s32 *)data)[0]);
184 
        if (stype)
185 
                *stype = htonl(((__s32 *)data)[bsize - 1]);
186 
 
187 
        sum    = 0;
188 
        p      = data;
189 
        while (bsize--)
190 
                sum += htonl(*p++);
191 
        return sum;
192 
}
193 
 
194 
void
195 
affs_fix_checksum(int bsize, void *data, int cspos)
196 
{
197 
        __u32    ocs;
198 
        __u32    cs;
199 
 
200 
        cs   = affs_checksum_block(bsize,data,NULL,NULL);
201 
        ocs  = htonl (((__u32 *)data)[cspos]);
202 
        ocs -= cs;
203 
        ((__u32 *)data)[cspos] = htonl(ocs);
204 
}
205 
 
206 
void
207 
secs_to_datestamp(int secs, struct DateStamp *ds)
208 
{
209 
        __u32    days;
210 
        __u32    minute;
211 
 
212 
        secs -= sys_tz.tz_minuteswest * 60 +((8 * 365 + 2) * 24 * 60 * 60);
213 
        if (secs < 0)
214 
                secs = 0;
215 
        days    = secs / 86400;
216 
        secs   -= days * 86400;
217 
        minute  = secs / 60;
218 
        secs   -= minute * 60;
219 
 
220 
        ds->ds_Days   = htonl(days);
221 
        ds->ds_Minute = htonl(minute);
222 
        ds->ds_Tick   = htonl(secs * 50);
223 
}
224 
 
225 
int
226 
prot_to_mode(__u32 prot)
227 
{
228 
        int      mode = 0;
229 
 
230 
        if (AFFS_UMAYWRITE(prot))
231 
                mode |= S_IWUSR;
232 
        if (AFFS_UMAYREAD(prot))
233 
                mode |= S_IRUSR;
234 
        if (AFFS_UMAYEXECUTE(prot))
235 
                mode |= S_IXUSR;
236 
        if (AFFS_GMAYWRITE(prot))
237 
                mode |= S_IWGRP;
238 
        if (AFFS_GMAYREAD(prot))
239 
                mode |= S_IRGRP;
240 
        if (AFFS_GMAYEXECUTE(prot))
241 
                mode |= S_IXGRP;
242 
        if (AFFS_OMAYWRITE(prot))
243 
                mode |= S_IWOTH;
244 
        if (AFFS_OMAYREAD(prot))
245 
                mode |= S_IROTH;
246 
        if (AFFS_OMAYEXECUTE(prot))
247 
                mode |= S_IXOTH;
248 
 
249 
        return mode;
250 
}
251 
 
252 
unsigned int
253 
mode_to_prot(int mode)
254 
{
255 
        unsigned int     prot = 0;
256 
 
257 
        if (mode & S_IXUSR)
258 
                prot |= FIBF_SCRIPT;
259 
        if (mode & S_IRUSR)
260 
                prot |= FIBF_READ;
261 
        if (mode & S_IWUSR)
262 
                prot |= FIBF_WRITE | FIBF_DELETE;
263 
        if (mode & S_IRGRP)
264 
                prot |= FIBF_GRP_READ;
265 
        if (mode & S_IWGRP)
266 
                prot |= FIBF_GRP_WRITE;
267 
        if (mode & S_IROTH)
268 
                prot |= FIBF_OTR_READ;
269 
        if (mode & S_IWOTH)
270 
                prot |= FIBF_OTR_WRITE;
271 
 
272 
        return prot;
273 
}

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