1 /*
2 * linux/fs/hpfs/inode.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * inode VFS functions
7 */
8
9 #include <linux/sched.h>
10 #include <linux/smp_lock.h>
11 #include "hpfs_fn.h"
12
13 static struct file_operations hpfs_file_ops =
14 {
15 read: generic_file_read,
16 write: hpfs_file_write,
17 mmap: generic_file_mmap,
18 open: hpfs_open,
19 release: hpfs_file_release,
20 fsync: hpfs_file_fsync,
21 };
22
23 static struct inode_operations hpfs_file_iops =
24 {
25 truncate: hpfs_truncate,
26 setattr: hpfs_notify_change,
27 };
28
29 static struct file_operations hpfs_dir_ops =
30 {
31 llseek: hpfs_dir_lseek,
32 read: generic_read_dir,
33 readdir: hpfs_readdir,
34 open: hpfs_open,
35 release: hpfs_dir_release,
36 fsync: hpfs_file_fsync,
37 };
38
39 static struct inode_operations hpfs_dir_iops =
40 {
41 create: hpfs_create,
42 lookup: hpfs_lookup,
43 unlink: hpfs_unlink,
44 symlink: hpfs_symlink,
45 mkdir: hpfs_mkdir,
46 rmdir: hpfs_rmdir,
47 mknod: hpfs_mknod,
48 rename: hpfs_rename,
49 setattr: hpfs_notify_change,
50 };
51
52 struct address_space_operations hpfs_symlink_aops = {
53 readpage: hpfs_symlink_readpage
54 };
55
56 void hpfs_read_inode(struct inode *i)
57 {
58 struct buffer_head *bh;
59 struct fnode *fnode;
60 struct super_block *sb = i->i_sb;
61 unsigned char *ea;
62 int ea_size;
63 init_MUTEX(&i->i_hpfs_sem);
64 i->i_uid = sb->s_hpfs_uid;
65 i->i_gid = sb->s_hpfs_gid;
66 i->i_mode = sb->s_hpfs_mode;
67 i->i_hpfs_conv = sb->s_hpfs_conv;
68 i->i_blksize = 512;
69 i->i_size = -1;
70 i->i_blocks = -1;
71
72 i->i_hpfs_dno = 0;
73 i->i_hpfs_n_secs = 0;
74 i->i_hpfs_file_sec = 0;
75 i->i_hpfs_disk_sec = 0;
76 i->i_hpfs_dpos = 0;
77 i->i_hpfs_dsubdno = 0;
78 i->i_hpfs_ea_mode = 0;
79 i->i_hpfs_ea_uid = 0;
80 i->i_hpfs_ea_gid = 0;
81 i->i_hpfs_ea_size = 0;
82 i->i_version = ++event;
83
84 i->i_hpfs_rddir_off = NULL;
85 i->i_hpfs_dirty = 0;
86
87 i->i_atime = 0;
88 i->i_mtime = 0;
89 i->i_ctime = 0;
90
91 if (!i->i_sb->s_hpfs_rd_inode)
92 hpfs_error(i->i_sb, "read_inode: s_hpfs_rd_inode == 0");
93 if (i->i_sb->s_hpfs_rd_inode == 2) {
94 i->i_mode |= S_IFREG;
95 i->i_mode &= ~0111;
96 i->i_op = &hpfs_file_iops;
97 i->i_fop = &hpfs_file_ops;
98 i->i_nlink = 1;
99 return;
100 }
101 if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
102 /*i->i_mode |= S_IFREG;
103 i->i_mode &= ~0111;
104 i->i_op = &hpfs_file_iops;
105 i->i_fop = &hpfs_file_ops;
106 i->i_nlink = 0;*/
107 make_bad_inode(i);
108 return;
109 }
110 if (i->i_sb->s_hpfs_eas) {
111 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
112 if (ea_size == 2) {
113 i->i_uid = ea[0] + (ea[1] << 8);
114 i->i_hpfs_ea_uid = 1;
115 }
116 kfree(ea);
117 }
118 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
119 if (ea_size == 2) {
120 i->i_gid = ea[0] + (ea[1] << 8);
121 i->i_hpfs_ea_gid = 1;
122 }
123 kfree(ea);
124 }
125 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
126 kfree(ea);
127 i->i_mode = S_IFLNK | 0777;
128 i->i_op = &page_symlink_inode_operations;
129 i->i_data.a_ops = &hpfs_symlink_aops;
130 i->i_nlink = 1;
131 i->i_size = ea_size;
132 i->i_blocks = 1;
133 brelse(bh);
134 return;
135 }
136 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
137 int rdev = 0;
138 umode_t mode = sb->s_hpfs_mode;
139 if (ea_size == 2) {
140 mode = ea[0] + (ea[1] << 8);
141 i->i_hpfs_ea_mode = 1;
142 }
143 kfree(ea);
144 i->i_mode = mode;
145 if (S_ISBLK(mode) || S_ISCHR(mode)) {
146 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
147 if (ea_size == 4)
148 rdev = ea[0] + (ea[1] << 8) + (ea[2] << 16) + (ea[3] << 24);
149 kfree(ea);
150 }
151 }
152 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
153 brelse(bh);
154 i->i_nlink = 1;
155 i->i_size = 0;
156 i->i_blocks = 1;
157 init_special_inode(i, mode, rdev);
158 return;
159 }
160 }
161 }
162 if (fnode->dirflag) {
163 unsigned n_dnodes, n_subdirs;
164 i->i_mode |= S_IFDIR;
165 i->i_op = &hpfs_dir_iops;
166 i->i_fop = &hpfs_dir_ops;
167 i->i_hpfs_parent_dir = fnode->up;
168 i->i_hpfs_dno = fnode->u.external[0].disk_secno;
169 if (sb->s_hpfs_chk >= 2) {
170 struct buffer_head *bh0;
171 if (hpfs_map_fnode(sb, i->i_hpfs_parent_dir, &bh0)) brelse(bh0);
172 }
173 n_dnodes = 0; n_subdirs = 0;
174 hpfs_count_dnodes(i->i_sb, i->i_hpfs_dno, &n_dnodes, &n_subdirs, NULL);
175 i->i_blocks = 4 * n_dnodes;
176 i->i_size = 2048 * n_dnodes;
177 i->i_nlink = 2 + n_subdirs;
178 } else {
179 i->i_mode |= S_IFREG;
180 if (!i->i_hpfs_ea_mode) i->i_mode &= ~0111;
181 i->i_op = &hpfs_file_iops;
182 i->i_fop = &hpfs_file_ops;
183 i->i_nlink = 1;
184 i->i_size = fnode->file_size;
185 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
186 i->i_data.a_ops = &hpfs_aops;
187 i->u.hpfs_i.mmu_private = i->i_size;
188 }
189 brelse(bh);
190 }
191
192 void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
193 {
194 if (fnode->acl_size_l || fnode->acl_size_s) {
195 /* Some unknown structures like ACL may be in fnode,
196 we'd better not overwrite them */
197 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
198 } else if (i->i_sb->s_hpfs_eas >= 2) {
199 unsigned char ea[4];
200 if ((i->i_uid != i->i_sb->s_hpfs_uid) || i->i_hpfs_ea_uid) {
201 ea[0] = i->i_uid & 0xff;
202 ea[1] = i->i_uid >> 8;
203 hpfs_set_ea(i, fnode, "UID", ea, 2);
204 i->i_hpfs_ea_uid = 1;
205 }
206 if ((i->i_gid != i->i_sb->s_hpfs_gid) || i->i_hpfs_ea_gid) {
207 ea[0] = i->i_gid & 0xff;
208 ea[1] = i->i_gid >> 8;
209 hpfs_set_ea(i, fnode, "GID", ea, 2);
210 i->i_hpfs_ea_gid = 1;
211 }
212 if (!S_ISLNK(i->i_mode))
213 if ((i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
214 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
215 && i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
216 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || i->i_hpfs_ea_mode) {
217 ea[0] = i->i_mode & 0xff;
218 ea[1] = i->i_mode >> 8;
219 hpfs_set_ea(i, fnode, "MODE", ea, 2);
220 i->i_hpfs_ea_mode = 1;
221 }
222 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
223 int d = kdev_t_to_nr(i->i_rdev);
224 ea[0] = d & 0xff;
225 ea[1] = (d >> 8) & 0xff;
226 ea[2] = (d >> 16) & 0xff;
227 ea[3] = d >> 24;
228 hpfs_set_ea(i, fnode, "DEV", ea, 4);
229 }
230 }
231 }
232
233 void hpfs_write_inode(struct inode *i)
234 {
235 struct inode *parent;
236 if (!i->i_nlink) return;
237 if (i->i_ino == i->i_sb->s_hpfs_root) return;
238 if (i->i_hpfs_rddir_off && !atomic_read(&i->i_count)) {
239 if (*i->i_hpfs_rddir_off) printk("HPFS: write_inode: some position still there\n");
240 kfree(i->i_hpfs_rddir_off);
241 i->i_hpfs_rddir_off = NULL;
242 }
243 i->i_hpfs_dirty = 0;
244 hpfs_lock_iget(i->i_sb, 1);
245 parent = iget(i->i_sb, i->i_hpfs_parent_dir);
246 hpfs_unlock_iget(i->i_sb);
247 hpfs_lock_inode(parent);
248 hpfs_write_inode_nolock(i);
249 hpfs_unlock_inode(parent);
250 iput(parent);
251 }
252
253 void hpfs_write_inode_nolock(struct inode *i)
254 {
255 struct buffer_head *bh;
256 struct fnode *fnode;
257 struct quad_buffer_head qbh;
258 struct hpfs_dirent *de;
259 if (i->i_ino == i->i_sb->s_hpfs_root) return;
260 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
261 if (i->i_ino != i->i_sb->s_hpfs_root) {
262 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
263 brelse(bh);
264 return;
265 }
266 } else de = NULL;
267 if (S_ISREG(i->i_mode)) {
268 fnode->file_size = de->file_size = i->i_size;
269 } else if (S_ISDIR(i->i_mode)) {
270 fnode->file_size = de->file_size = 0;
271 }
272 hpfs_write_inode_ea(i, fnode);
273 if (de) {
274 de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
275 de->read_date = gmt_to_local(i->i_sb, i->i_atime);
276 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
277 de->read_only = !(i->i_mode & 0222);
278 de->ea_size = i->i_hpfs_ea_size;
279 hpfs_mark_4buffers_dirty(&qbh);
280 hpfs_brelse4(&qbh);
281 }
282 if (S_ISDIR(i->i_mode)) {
283 if ((de = map_dirent(i, i->i_hpfs_dno, "\001\001", 2, NULL, &qbh))) {
284 de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
285 de->read_date = gmt_to_local(i->i_sb, i->i_atime);
286 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
287 de->read_only = !(i->i_mode & 0222);
288 de->ea_size = /*i->i_hpfs_ea_size*/0;
289 de->file_size = 0;
290 hpfs_mark_4buffers_dirty(&qbh);
291 hpfs_brelse4(&qbh);
292 } else hpfs_error(i->i_sb, "directory %08x doesn't have '.' entry", i->i_ino);
293 }
294 mark_buffer_dirty(bh);
295 brelse(bh);
296 }
297
298 int hpfs_notify_change(struct dentry *dentry, struct iattr *attr)
299 {
300 struct inode *inode = dentry->d_inode;
301 int error;
302 if (inode->i_sb->s_hpfs_root == inode->i_ino) return -EINVAL;
303 if ((error = inode_change_ok(inode, attr))) return error;
304 inode_setattr(inode, attr);
305 hpfs_write_inode(inode);
306 return 0;
307 }
308
309 void hpfs_write_if_changed(struct inode *inode)
310 {
311 if (inode->i_hpfs_dirty) {
312 hpfs_write_inode(inode);
313 }
314 }
315
316 void hpfs_delete_inode(struct inode *inode)
317 {
318 lock_kernel();
319 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
320 unlock_kernel();
321 clear_inode(inode);
322 }
323
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