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9#include <linux/slab.h>
10#include "hpfs_fn.h"
11
12static int hpfs_dir_release(struct inode *inode, struct file *filp)
13{
14 hpfs_lock(inode->i_sb);
15 hpfs_del_pos(inode, &filp->f_pos);
16
17 hpfs_unlock(inode->i_sb);
18 return 0;
19}
20
21
22
23static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
24{
25 loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
26 loff_t pos;
27 struct quad_buffer_head qbh;
28 struct inode *i = file_inode(filp);
29 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
30 struct super_block *s = i->i_sb;
31
32
33 if (whence == SEEK_DATA || whence == SEEK_HOLE)
34 return -EINVAL;
35
36 mutex_lock(&i->i_mutex);
37 hpfs_lock(s);
38
39
40 if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
41 pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1;
42 while (pos != new_off) {
43 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
44 else goto fail;
45 if (pos == 12) goto fail;
46 }
47 hpfs_add_pos(i, &filp->f_pos);
48ok:
49 filp->f_pos = new_off;
50 hpfs_unlock(s);
51 mutex_unlock(&i->i_mutex);
52 return new_off;
53fail:
54
55 hpfs_unlock(s);
56 mutex_unlock(&i->i_mutex);
57 return -ESPIPE;
58}
59
60static int hpfs_readdir(struct file *file, struct dir_context *ctx)
61{
62 struct inode *inode = file_inode(file);
63 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
64 struct quad_buffer_head qbh;
65 struct hpfs_dirent *de;
66 int lc;
67 loff_t next_pos;
68 unsigned char *tempname;
69 int c1, c2 = 0;
70 int ret = 0;
71
72 hpfs_lock(inode->i_sb);
73
74 if (hpfs_sb(inode->i_sb)->sb_chk) {
75 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) {
76 ret = -EFSERROR;
77 goto out;
78 }
79 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) {
80 ret = -EFSERROR;
81 goto out;
82 }
83 }
84 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) {
85 struct buffer_head *bh;
86 struct fnode *fno;
87 int e = 0;
88 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) {
89 ret = -EIOERROR;
90 goto out;
91 }
92 if (!fnode_is_dir(fno)) {
93 e = 1;
94 hpfs_error(inode->i_sb, "not a directory, fnode %08lx",
95 (unsigned long)inode->i_ino);
96 }
97 if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) {
98 e = 1;
99 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, le32_to_cpu(fno->u.external[0].disk_secno));
100 }
101 brelse(bh);
102 if (e) {
103 ret = -EFSERROR;
104 goto out;
105 }
106 }
107 lc = hpfs_sb(inode->i_sb)->sb_lowercase;
108 if (ctx->pos == 12) {
109 ctx->pos = 13;
110 goto out;
111 }
112 if (ctx->pos == 13) {
113 ret = -ENOENT;
114 goto out;
115 }
116
117 while (1) {
118 again:
119
120
121
122 if (hpfs_sb(inode->i_sb)->sb_chk)
123 if (hpfs_stop_cycles(inode->i_sb, ctx->pos, &c1, &c2, "hpfs_readdir")) {
124 ret = -EFSERROR;
125 goto out;
126 }
127 if (ctx->pos == 12)
128 goto out;
129 if (ctx->pos == 3 || ctx->pos == 4 || ctx->pos == 5) {
130 printk("HPFS: warning: pos==%d\n",(int)ctx->pos);
131 goto out;
132 }
133 if (ctx->pos == 0) {
134 if (!dir_emit_dot(file, ctx))
135 goto out;
136 ctx->pos = 11;
137 }
138 if (ctx->pos == 11) {
139 if (!dir_emit(ctx, "..", 2, hpfs_inode->i_parent_dir, DT_DIR))
140 goto out;
141 ctx->pos = 1;
142 }
143 if (ctx->pos == 1) {
144 ctx->pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
145 hpfs_add_pos(inode, &file->f_pos);
146 file->f_version = inode->i_version;
147 }
148 next_pos = ctx->pos;
149 if (!(de = map_pos_dirent(inode, &next_pos, &qbh))) {
150 ctx->pos = next_pos;
151 ret = -EIOERROR;
152 goto out;
153 }
154 if (de->first || de->last) {
155 if (hpfs_sb(inode->i_sb)->sb_chk) {
156 if (de->first && !de->last && (de->namelen != 2
157 || de ->name[0] != 1 || de->name[1] != 1))
158 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", (unsigned long)ctx->pos);
159 if (de->last && (de->namelen != 1 || de ->name[0] != 255))
160 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", (unsigned long)ctx->pos);
161 }
162 hpfs_brelse4(&qbh);
163 ctx->pos = next_pos;
164 goto again;
165 }
166 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
167 if (!dir_emit(ctx, tempname, de->namelen, le32_to_cpu(de->fnode), DT_UNKNOWN)) {
168 if (tempname != de->name) kfree(tempname);
169 hpfs_brelse4(&qbh);
170 goto out;
171 }
172 ctx->pos = next_pos;
173 if (tempname != de->name) kfree(tempname);
174 hpfs_brelse4(&qbh);
175 }
176out:
177 hpfs_unlock(inode->i_sb);
178 return ret;
179}
180
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195
196struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
197{
198 const unsigned char *name = dentry->d_name.name;
199 unsigned len = dentry->d_name.len;
200 struct quad_buffer_head qbh;
201 struct hpfs_dirent *de;
202 ino_t ino;
203 int err;
204 struct inode *result = NULL;
205 struct hpfs_inode_info *hpfs_result;
206
207 hpfs_lock(dir->i_sb);
208 if ((err = hpfs_chk_name(name, &len))) {
209 if (err == -ENAMETOOLONG) {
210 hpfs_unlock(dir->i_sb);
211 return ERR_PTR(-ENAMETOOLONG);
212 }
213 goto end_add;
214 }
215
216
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218
219
220 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh);
221
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224
225
226 if (!de) goto end;
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230
231
232 ino = le32_to_cpu(de->fnode);
233
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237
238 result = iget_locked(dir->i_sb, ino);
239 if (!result) {
240 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
241 goto bail1;
242 }
243 if (result->i_state & I_NEW) {
244 hpfs_init_inode(result);
245 if (de->directory)
246 hpfs_read_inode(result);
247 else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas)
248 hpfs_read_inode(result);
249 else {
250 result->i_mode |= S_IFREG;
251 result->i_mode &= ~0111;
252 result->i_op = &hpfs_file_iops;
253 result->i_fop = &hpfs_file_ops;
254 set_nlink(result, 1);
255 }
256 unlock_new_inode(result);
257 }
258 hpfs_result = hpfs_i(result);
259 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
260
261 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
262 hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures");
263 goto bail1;
264 }
265
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269
270
271 if (!result->i_ctime.tv_sec) {
272 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date))))
273 result->i_ctime.tv_sec = 1;
274 result->i_ctime.tv_nsec = 0;
275 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date));
276 result->i_mtime.tv_nsec = 0;
277 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date));
278 result->i_atime.tv_nsec = 0;
279 hpfs_result->i_ea_size = le32_to_cpu(de->ea_size);
280 if (!hpfs_result->i_ea_mode && de->read_only)
281 result->i_mode &= ~0222;
282 if (!de->directory) {
283 if (result->i_size == -1) {
284 result->i_size = le32_to_cpu(de->file_size);
285 result->i_data.a_ops = &hpfs_aops;
286 hpfs_i(result)->mmu_private = result->i_size;
287
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292
293 result->i_blocks = 1 + ((result->i_size + 511) >> 9);
294 }
295 }
296 }
297
298 hpfs_brelse4(&qbh);
299
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302
303
304 end:
305 end_add:
306 hpfs_unlock(dir->i_sb);
307 d_add(dentry, result);
308 return NULL;
309
310
311
312
313 bail1:
314
315 hpfs_brelse4(&qbh);
316
317
318
319 hpfs_unlock(dir->i_sb);
320 return ERR_PTR(-ENOENT);
321}
322
323const struct file_operations hpfs_dir_ops =
324{
325 .llseek = hpfs_dir_lseek,
326 .read = generic_read_dir,
327 .iterate = hpfs_readdir,
328 .release = hpfs_dir_release,
329 .fsync = hpfs_file_fsync,
330};
331