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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/smp_lock.h> |
10 | #include <linux/slab.h> |
11 | #include "hpfs_fn.h" |
12 | |
13 | void hpfs_init_inode(struct inode *i) |
14 | { |
15 | struct super_block *sb = i->i_sb; |
16 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
17 | |
18 | i->i_uid = hpfs_sb(sb)->sb_uid; |
19 | i->i_gid = hpfs_sb(sb)->sb_gid; |
20 | i->i_mode = hpfs_sb(sb)->sb_mode; |
21 | hpfs_inode->i_conv = hpfs_sb(sb)->sb_conv; |
22 | i->i_size = -1; |
23 | i->i_blocks = -1; |
24 | |
25 | hpfs_inode->i_dno = 0; |
26 | hpfs_inode->i_n_secs = 0; |
27 | hpfs_inode->i_file_sec = 0; |
28 | hpfs_inode->i_disk_sec = 0; |
29 | hpfs_inode->i_dpos = 0; |
30 | hpfs_inode->i_dsubdno = 0; |
31 | hpfs_inode->i_ea_mode = 0; |
32 | hpfs_inode->i_ea_uid = 0; |
33 | hpfs_inode->i_ea_gid = 0; |
34 | hpfs_inode->i_ea_size = 0; |
35 | |
36 | hpfs_inode->i_rddir_off = NULL; |
37 | hpfs_inode->i_dirty = 0; |
38 | |
39 | i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0; |
40 | i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0; |
41 | i->i_atime.tv_sec = i->i_atime.tv_nsec = 0; |
42 | } |
43 | |
44 | void hpfs_read_inode(struct inode *i) |
45 | { |
46 | struct buffer_head *bh; |
47 | struct fnode *fnode; |
48 | struct super_block *sb = i->i_sb; |
49 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
50 | void *ea; |
51 | int ea_size; |
52 | |
53 | if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) { |
54 | /*i->i_mode |= S_IFREG; |
55 | i->i_mode &= ~0111; |
56 | i->i_op = &hpfs_file_iops; |
57 | i->i_fop = &hpfs_file_ops; |
58 | i->i_nlink = 0;*/ |
59 | make_bad_inode(i); |
60 | return; |
61 | } |
62 | if (hpfs_sb(i->i_sb)->sb_eas) { |
63 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) { |
64 | if (ea_size == 2) { |
65 | i->i_uid = le16_to_cpu(*(__le16*)ea); |
66 | hpfs_inode->i_ea_uid = 1; |
67 | } |
68 | kfree(ea); |
69 | } |
70 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) { |
71 | if (ea_size == 2) { |
72 | i->i_gid = le16_to_cpu(*(__le16*)ea); |
73 | hpfs_inode->i_ea_gid = 1; |
74 | } |
75 | kfree(ea); |
76 | } |
77 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) { |
78 | kfree(ea); |
79 | i->i_mode = S_IFLNK | 0777; |
80 | i->i_op = &page_symlink_inode_operations; |
81 | i->i_data.a_ops = &hpfs_symlink_aops; |
82 | i->i_nlink = 1; |
83 | i->i_size = ea_size; |
84 | i->i_blocks = 1; |
85 | brelse(bh); |
86 | return; |
87 | } |
88 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) { |
89 | int rdev = 0; |
90 | umode_t mode = hpfs_sb(sb)->sb_mode; |
91 | if (ea_size == 2) { |
92 | mode = le16_to_cpu(*(__le16*)ea); |
93 | hpfs_inode->i_ea_mode = 1; |
94 | } |
95 | kfree(ea); |
96 | i->i_mode = mode; |
97 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
98 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) { |
99 | if (ea_size == 4) |
100 | rdev = le32_to_cpu(*(__le32*)ea); |
101 | kfree(ea); |
102 | } |
103 | } |
104 | if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
105 | brelse(bh); |
106 | i->i_nlink = 1; |
107 | i->i_size = 0; |
108 | i->i_blocks = 1; |
109 | init_special_inode(i, mode, |
110 | new_decode_dev(rdev)); |
111 | return; |
112 | } |
113 | } |
114 | } |
115 | if (fnode->dirflag) { |
116 | int n_dnodes, n_subdirs; |
117 | i->i_mode |= S_IFDIR; |
118 | i->i_op = &hpfs_dir_iops; |
119 | i->i_fop = &hpfs_dir_ops; |
120 | hpfs_inode->i_parent_dir = fnode->up; |
121 | hpfs_inode->i_dno = fnode->u.external[0].disk_secno; |
122 | if (hpfs_sb(sb)->sb_chk >= 2) { |
123 | struct buffer_head *bh0; |
124 | if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0); |
125 | } |
126 | n_dnodes = 0; n_subdirs = 0; |
127 | hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL); |
128 | i->i_blocks = 4 * n_dnodes; |
129 | i->i_size = 2048 * n_dnodes; |
130 | i->i_nlink = 2 + n_subdirs; |
131 | } else { |
132 | i->i_mode |= S_IFREG; |
133 | if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111; |
134 | i->i_op = &hpfs_file_iops; |
135 | i->i_fop = &hpfs_file_ops; |
136 | i->i_nlink = 1; |
137 | i->i_size = fnode->file_size; |
138 | i->i_blocks = ((i->i_size + 511) >> 9) + 1; |
139 | i->i_data.a_ops = &hpfs_aops; |
140 | hpfs_i(i)->mmu_private = i->i_size; |
141 | } |
142 | brelse(bh); |
143 | } |
144 | |
145 | static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode) |
146 | { |
147 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
148 | /*if (fnode->acl_size_l || fnode->acl_size_s) { |
149 | Some unknown structures like ACL may be in fnode, |
150 | we'd better not overwrite them |
151 | hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino); |
152 | } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) { |
153 | __le32 ea; |
154 | if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) { |
155 | ea = cpu_to_le32(i->i_uid); |
156 | hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2); |
157 | hpfs_inode->i_ea_uid = 1; |
158 | } |
159 | if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) { |
160 | ea = cpu_to_le32(i->i_gid); |
161 | hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2); |
162 | hpfs_inode->i_ea_gid = 1; |
163 | } |
164 | if (!S_ISLNK(i->i_mode)) |
165 | if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111)) |
166 | | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG)) |
167 | && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333)) |
168 | | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) { |
169 | ea = cpu_to_le32(i->i_mode); |
170 | /* sick, but legal */ |
171 | hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2); |
172 | hpfs_inode->i_ea_mode = 1; |
173 | } |
174 | if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) { |
175 | ea = cpu_to_le32(new_encode_dev(i->i_rdev)); |
176 | hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4); |
177 | } |
178 | } |
179 | } |
180 | |
181 | void hpfs_write_inode(struct inode *i) |
182 | { |
183 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
184 | struct inode *parent; |
185 | if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; |
186 | if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) { |
187 | if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n"); |
188 | kfree(hpfs_inode->i_rddir_off); |
189 | hpfs_inode->i_rddir_off = NULL; |
190 | } |
191 | mutex_lock(&hpfs_inode->i_parent_mutex); |
192 | if (!i->i_nlink) { |
193 | mutex_unlock(&hpfs_inode->i_parent_mutex); |
194 | return; |
195 | } |
196 | parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir); |
197 | if (parent) { |
198 | hpfs_inode->i_dirty = 0; |
199 | if (parent->i_state & I_NEW) { |
200 | hpfs_init_inode(parent); |
201 | hpfs_read_inode(parent); |
202 | unlock_new_inode(parent); |
203 | } |
204 | mutex_lock(&hpfs_inode->i_mutex); |
205 | hpfs_write_inode_nolock(i); |
206 | mutex_unlock(&hpfs_inode->i_mutex); |
207 | iput(parent); |
208 | } else { |
209 | mark_inode_dirty(i); |
210 | } |
211 | mutex_unlock(&hpfs_inode->i_parent_mutex); |
212 | } |
213 | |
214 | void hpfs_write_inode_nolock(struct inode *i) |
215 | { |
216 | struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
217 | struct buffer_head *bh; |
218 | struct fnode *fnode; |
219 | struct quad_buffer_head qbh; |
220 | struct hpfs_dirent *de; |
221 | if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; |
222 | if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return; |
223 | if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) { |
224 | if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) { |
225 | brelse(bh); |
226 | return; |
227 | } |
228 | } else de = NULL; |
229 | if (S_ISREG(i->i_mode)) { |
230 | fnode->file_size = i->i_size; |
231 | if (de) de->file_size = i->i_size; |
232 | } else if (S_ISDIR(i->i_mode)) { |
233 | fnode->file_size = 0; |
234 | if (de) de->file_size = 0; |
235 | } |
236 | hpfs_write_inode_ea(i, fnode); |
237 | if (de) { |
238 | de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec); |
239 | de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec); |
240 | de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec); |
241 | de->read_only = !(i->i_mode & 0222); |
242 | de->ea_size = hpfs_inode->i_ea_size; |
243 | hpfs_mark_4buffers_dirty(&qbh); |
244 | hpfs_brelse4(&qbh); |
245 | } |
246 | if (S_ISDIR(i->i_mode)) { |
247 | if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) { |
248 | de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec); |
249 | de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec); |
250 | de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec); |
251 | de->read_only = !(i->i_mode & 0222); |
252 | de->ea_size = /*hpfs_inode->i_ea_size*/0; |
253 | de->file_size = 0; |
254 | hpfs_mark_4buffers_dirty(&qbh); |
255 | hpfs_brelse4(&qbh); |
256 | } else |
257 | hpfs_error(i->i_sb, |
258 | "directory %08lx doesn't have '.' entry", |
259 | (unsigned long)i->i_ino); |
260 | } |
261 | mark_buffer_dirty(bh); |
262 | brelse(bh); |
263 | } |
264 | |
265 | int hpfs_setattr(struct dentry *dentry, struct iattr *attr) |
266 | { |
267 | struct inode *inode = dentry->d_inode; |
268 | int error = -EINVAL; |
269 | |
270 | lock_kernel(); |
271 | if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) |
272 | goto out_unlock; |
273 | if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) |
274 | goto out_unlock; |
275 | |
276 | error = inode_change_ok(inode, attr); |
277 | if (error) |
278 | goto out_unlock; |
279 | |
280 | error = inode_setattr(inode, attr); |
281 | if (error) |
282 | goto out_unlock; |
283 | |
284 | hpfs_write_inode(inode); |
285 | |
286 | out_unlock: |
287 | unlock_kernel(); |
288 | return error; |
289 | } |
290 | |
291 | void hpfs_write_if_changed(struct inode *inode) |
292 | { |
293 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
294 | |
295 | if (hpfs_inode->i_dirty) |
296 | hpfs_write_inode(inode); |
297 | } |
298 | |
299 | void hpfs_delete_inode(struct inode *inode) |
300 | { |
301 | truncate_inode_pages(&inode->i_data, 0); |
302 | lock_kernel(); |
303 | hpfs_remove_fnode(inode->i_sb, inode->i_ino); |
304 | unlock_kernel(); |
305 | clear_inode(inode); |
306 | } |
307 |
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