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Linux/fs/adfs/dir_fplus.c

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  1 /*
  2  *  linux/fs/adfs/dir_fplus.c
  3  *
  4  *  Copyright (C) 1997-1999 Russell King
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/buffer_head.h>
 11 #include <linux/slab.h>
 12 #include "adfs.h"
 13 #include "dir_fplus.h"
 14 
 15 static int
 16 adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
 17 {
 18         struct adfs_bigdirheader *h;
 19         struct adfs_bigdirtail *t;
 20         unsigned long block;
 21         unsigned int blk, size;
 22         int i, ret = -EIO;
 23 
 24         dir->nr_buffers = 0;
 25 
 26         /* start off using fixed bh set - only alloc for big dirs */
 27         dir->bh_fplus = &dir->bh[0];
 28 
 29         block = __adfs_block_map(sb, id, 0);
 30         if (!block) {
 31                 adfs_error(sb, "dir object %X has a hole at offset 0", id);
 32                 goto out;
 33         }
 34 
 35         dir->bh_fplus[0] = sb_bread(sb, block);
 36         if (!dir->bh_fplus[0])
 37                 goto out;
 38         dir->nr_buffers += 1;
 39 
 40         h = (struct adfs_bigdirheader *)dir->bh_fplus[0]->b_data;
 41         size = le32_to_cpu(h->bigdirsize);
 42         if (size != sz) {
 43                 printk(KERN_WARNING "adfs: adfs_fplus_read:"
 44                                         " directory header size %X\n"
 45                                         " does not match directory size %X\n",
 46                                         size, sz);
 47         }
 48 
 49         if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
 50             h->bigdirversion[2] != 0 || size & 2047 ||
 51             h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME)) {
 52                 printk(KERN_WARNING "adfs: dir object %X has"
 53                                         " malformed dir header\n", id);
 54                 goto out;
 55         }
 56 
 57         size >>= sb->s_blocksize_bits;
 58         if (size > sizeof(dir->bh)/sizeof(dir->bh[0])) {
 59                 /* this directory is too big for fixed bh set, must allocate */
 60                 struct buffer_head **bh_fplus =
 61                         kzalloc(size * sizeof(struct buffer_head *),
 62                                 GFP_KERNEL);
 63                 if (!bh_fplus) {
 64                         adfs_error(sb, "not enough memory for"
 65                                         " dir object %X (%d blocks)", id, size);
 66                         goto out;
 67                 }
 68                 dir->bh_fplus = bh_fplus;
 69                 /* copy over the pointer to the block that we've already read */
 70                 dir->bh_fplus[0] = dir->bh[0];
 71         }
 72 
 73         for (blk = 1; blk < size; blk++) {
 74                 block = __adfs_block_map(sb, id, blk);
 75                 if (!block) {
 76                         adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
 77                         goto out;
 78                 }
 79 
 80                 dir->bh_fplus[blk] = sb_bread(sb, block);
 81                 if (!dir->bh_fplus[blk]) {
 82                         adfs_error(sb,  "dir object %X failed read for"
 83                                         " offset %d, mapped block %X",
 84                                         id, blk, block);
 85                         goto out;
 86                 }
 87 
 88                 dir->nr_buffers += 1;
 89         }
 90 
 91         t = (struct adfs_bigdirtail *)
 92                 (dir->bh_fplus[size - 1]->b_data + (sb->s_blocksize - 8));
 93 
 94         if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
 95             t->bigdirendmasseq != h->startmasseq ||
 96             t->reserved[0] != 0 || t->reserved[1] != 0) {
 97                 printk(KERN_WARNING "adfs: dir object %X has "
 98                                         "malformed dir end\n", id);
 99                 goto out;
100         }
101 
102         dir->parent_id = le32_to_cpu(h->bigdirparent);
103         dir->sb = sb;
104         return 0;
105 
106 out:
107         if (dir->bh_fplus) {
108                 for (i = 0; i < dir->nr_buffers; i++)
109                         brelse(dir->bh_fplus[i]);
110 
111                 if (&dir->bh[0] != dir->bh_fplus)
112                         kfree(dir->bh_fplus);
113 
114                 dir->bh_fplus = NULL;
115         }
116 
117         dir->nr_buffers = 0;
118         dir->sb = NULL;
119         return ret;
120 }
121 
122 static int
123 adfs_fplus_setpos(struct adfs_dir *dir, unsigned int fpos)
124 {
125         struct adfs_bigdirheader *h =
126                 (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
127         int ret = -ENOENT;
128 
129         if (fpos <= le32_to_cpu(h->bigdirentries)) {
130                 dir->pos = fpos;
131                 ret = 0;
132         }
133 
134         return ret;
135 }
136 
137 static void
138 dir_memcpy(struct adfs_dir *dir, unsigned int offset, void *to, int len)
139 {
140         struct super_block *sb = dir->sb;
141         unsigned int buffer, partial, remainder;
142 
143         buffer = offset >> sb->s_blocksize_bits;
144         offset &= sb->s_blocksize - 1;
145 
146         partial = sb->s_blocksize - offset;
147 
148         if (partial >= len)
149                 memcpy(to, dir->bh_fplus[buffer]->b_data + offset, len);
150         else {
151                 char *c = (char *)to;
152 
153                 remainder = len - partial;
154 
155                 memcpy(c,
156                         dir->bh_fplus[buffer]->b_data + offset,
157                         partial);
158 
159                 memcpy(c + partial,
160                         dir->bh_fplus[buffer + 1]->b_data,
161                         remainder);
162         }
163 }
164 
165 static int
166 adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
167 {
168         struct adfs_bigdirheader *h =
169                 (struct adfs_bigdirheader *) dir->bh_fplus[0]->b_data;
170         struct adfs_bigdirentry bde;
171         unsigned int offset;
172         int i, ret = -ENOENT;
173 
174         if (dir->pos >= le32_to_cpu(h->bigdirentries))
175                 goto out;
176 
177         offset = offsetof(struct adfs_bigdirheader, bigdirname);
178         offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
179         offset += dir->pos * sizeof(struct adfs_bigdirentry);
180 
181         dir_memcpy(dir, offset, &bde, sizeof(struct adfs_bigdirentry));
182 
183         obj->loadaddr = le32_to_cpu(bde.bigdirload);
184         obj->execaddr = le32_to_cpu(bde.bigdirexec);
185         obj->size     = le32_to_cpu(bde.bigdirlen);
186         obj->file_id  = le32_to_cpu(bde.bigdirindaddr);
187         obj->attr     = le32_to_cpu(bde.bigdirattr);
188         obj->name_len = le32_to_cpu(bde.bigdirobnamelen);
189 
190         offset = offsetof(struct adfs_bigdirheader, bigdirname);
191         offset += ((le32_to_cpu(h->bigdirnamelen) + 4) & ~3);
192         offset += le32_to_cpu(h->bigdirentries) * sizeof(struct adfs_bigdirentry);
193         offset += le32_to_cpu(bde.bigdirobnameptr);
194 
195         dir_memcpy(dir, offset, obj->name, obj->name_len);
196         for (i = 0; i < obj->name_len; i++)
197                 if (obj->name[i] == '/')
198                         obj->name[i] = '.';
199 
200         obj->filetype = -1;
201 
202         /*
203          * object is a file and is filetyped and timestamped?
204          * RISC OS 12-bit filetype is stored in load_address[19:8]
205          */
206         if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
207                 (0xfff00000 == (0xfff00000 & obj->loadaddr))) {
208                 obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
209 
210                 /* optionally append the ,xyz hex filetype suffix */
211                 if (ADFS_SB(dir->sb)->s_ftsuffix)
212                         obj->name_len +=
213                                 append_filetype_suffix(
214                                         &obj->name[obj->name_len],
215                                         obj->filetype);
216         }
217 
218         dir->pos += 1;
219         ret = 0;
220 out:
221         return ret;
222 }
223 
224 static int
225 adfs_fplus_sync(struct adfs_dir *dir)
226 {
227         int err = 0;
228         int i;
229 
230         for (i = dir->nr_buffers - 1; i >= 0; i--) {
231                 struct buffer_head *bh = dir->bh_fplus[i];
232                 sync_dirty_buffer(bh);
233                 if (buffer_req(bh) && !buffer_uptodate(bh))
234                         err = -EIO;
235         }
236 
237         return err;
238 }
239 
240 static void
241 adfs_fplus_free(struct adfs_dir *dir)
242 {
243         int i;
244 
245         if (dir->bh_fplus) {
246                 for (i = 0; i < dir->nr_buffers; i++)
247                         brelse(dir->bh_fplus[i]);
248 
249                 if (&dir->bh[0] != dir->bh_fplus)
250                         kfree(dir->bh_fplus);
251 
252                 dir->bh_fplus = NULL;
253         }
254 
255         dir->nr_buffers = 0;
256         dir->sb = NULL;
257 }
258 
259 struct adfs_dir_ops adfs_fplus_dir_ops = {
260         .read           = adfs_fplus_read,
261         .setpos         = adfs_fplus_setpos,
262         .getnext        = adfs_fplus_getnext,
263         .sync           = adfs_fplus_sync,
264         .free           = adfs_fplus_free
265 };
266 

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