1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/hpfs/inode.c
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 *
7 * inode VFS functions
8 */
9
10 #include <linux/slab.h>
11 #include <linux/user_namespace.h>
12 #include "hpfs_fn.h"
13
14 void hpfs_init_inode(struct inode *i)
15 {
16 struct super_block *sb = i->i_sb;
17 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
18
19 i->i_uid = hpfs_sb(sb)->sb_uid;
20 i->i_gid = hpfs_sb(sb)->sb_gid;
21 i->i_mode = hpfs_sb(sb)->sb_mode;
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 inode_set_ctime(i, 0, 0);
40 inode_set_mtime(i, 0, 0);
41 inode_set_atime(i, 0, 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 clear_nlink(i);*/
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_uid_write(i, 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_gid_write(i, 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 inode_nohighmem(i);
82 i->i_data.a_ops = &hpfs_symlink_aops;
83 set_nlink(i, 1);
84 i->i_size = ea_size;
85 i->i_blocks = 1;
86 brelse(bh);
87 return;
88 }
89 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
90 int rdev = 0;
91 umode_t mode = hpfs_sb(sb)->sb_mode;
92 if (ea_size == 2) {
93 mode = le16_to_cpu(*(__le16*)ea);
94 hpfs_inode->i_ea_mode = 1;
95 }
96 kfree(ea);
97 i->i_mode = mode;
98 if (S_ISBLK(mode) || S_ISCHR(mode)) {
99 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
100 if (ea_size == 4)
101 rdev = le32_to_cpu(*(__le32*)ea);
102 kfree(ea);
103 }
104 }
105 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
106 brelse(bh);
107 set_nlink(i, 1);
108 i->i_size = 0;
109 i->i_blocks = 1;
110 init_special_inode(i, mode,
111 new_decode_dev(rdev));
112 return;
113 }
114 }
115 }
116 if (fnode_is_dir(fnode)) {
117 int n_dnodes, n_subdirs;
118 i->i_mode |= S_IFDIR;
119 i->i_op = &hpfs_dir_iops;
120 i->i_fop = &hpfs_dir_ops;
121 hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up);
122 hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno);
123 if (hpfs_sb(sb)->sb_chk >= 2) {
124 struct buffer_head *bh0;
125 if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
126 }
127 n_dnodes = 0; n_subdirs = 0;
128 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
129 i->i_blocks = 4 * n_dnodes;
130 i->i_size = 2048 * n_dnodes;
131 set_nlink(i, 2 + n_subdirs);
132 } else {
133 i->i_mode |= S_IFREG;
134 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
135 i->i_op = &hpfs_file_iops;
136 i->i_fop = &hpfs_file_ops;
137 set_nlink(i, 1);
138 i->i_size = le32_to_cpu(fnode->file_size);
139 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
140 i->i_data.a_ops = &hpfs_aops;
141 hpfs_i(i)->mmu_private = i->i_size;
142 }
143 brelse(bh);
144 }
145
146 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
147 {
148 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
149 /*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) {
150 Some unknown structures like ACL may be in fnode,
151 we'd better not overwrite them
152 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 structures", i->i_ino);
153 } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
154 __le32 ea;
155 if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
156 ea = cpu_to_le32(i_uid_read(i));
157 hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
158 hpfs_inode->i_ea_uid = 1;
159 }
160 if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
161 ea = cpu_to_le32(i_gid_read(i));
162 hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
163 hpfs_inode->i_ea_gid = 1;
164 }
165 if (!S_ISLNK(i->i_mode))
166 if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
167 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
168 && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
169 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
170 ea = cpu_to_le32(i->i_mode);
171 /* sick, but legal */
172 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
173 hpfs_inode->i_ea_mode = 1;
174 }
175 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
176 ea = cpu_to_le32(new_encode_dev(i->i_rdev));
177 hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
178 }
179 }
180 }
181
182 void hpfs_write_inode(struct inode *i)
183 {
184 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
185 struct inode *parent;
186 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
187 if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
188 if (*hpfs_inode->i_rddir_off)
189 pr_err("write_inode: some position still there\n");
190 kfree(hpfs_inode->i_rddir_off);
191 hpfs_inode->i_rddir_off = NULL;
192 }
193 if (!i->i_nlink) {
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 hpfs_write_inode_nolock(i);
205 iput(parent);
206 }
207 }
208
209 void hpfs_write_inode_nolock(struct inode *i)
210 {
211 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
212 struct buffer_head *bh;
213 struct fnode *fnode;
214 struct quad_buffer_head qbh;
215 struct hpfs_dirent *de;
216 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
217 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
218 if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
219 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
220 brelse(bh);
221 return;
222 }
223 } else de = NULL;
224 if (S_ISREG(i->i_mode)) {
225 fnode->file_size = cpu_to_le32(i->i_size);
226 if (de) de->file_size = cpu_to_le32(i->i_size);
227 } else if (S_ISDIR(i->i_mode)) {
228 fnode->file_size = cpu_to_le32(0);
229 if (de) de->file_size = cpu_to_le32(0);
230 }
231 hpfs_write_inode_ea(i, fnode);
232 if (de) {
233 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, inode_get_mtime_sec(i)));
234 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, inode_get_atime_sec(i)));
235 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, inode_get_ctime_sec(i)));
236 de->read_only = !(i->i_mode & 0222);
237 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
238 hpfs_mark_4buffers_dirty(&qbh);
239 hpfs_brelse4(&qbh);
240 }
241 if (S_ISDIR(i->i_mode)) {
242 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
243 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, inode_get_mtime_sec(i)));
244 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, inode_get_atime_sec(i)));
245 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, inode_get_ctime_sec(i)));
246 de->read_only = !(i->i_mode & 0222);
247 de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
248 de->file_size = cpu_to_le32(0);
249 hpfs_mark_4buffers_dirty(&qbh);
250 hpfs_brelse4(&qbh);
251 } else
252 hpfs_error(i->i_sb,
253 "directory %08lx doesn't have '.' entry",
254 (unsigned long)i->i_ino);
255 }
256 mark_buffer_dirty(bh);
257 brelse(bh);
258 }
259
260 int hpfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
261 struct iattr *attr)
262 {
263 struct inode *inode = d_inode(dentry);
264 int error = -EINVAL;
265
266 hpfs_lock(inode->i_sb);
267 if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
268 goto out_unlock;
269 if ((attr->ia_valid & ATTR_UID) &&
270 from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
271 goto out_unlock;
272 if ((attr->ia_valid & ATTR_GID) &&
273 from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
274 goto out_unlock;
275 if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
276 goto out_unlock;
277
278 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
279 if (error)
280 goto out_unlock;
281
282 if ((attr->ia_valid & ATTR_SIZE) &&
283 attr->ia_size != i_size_read(inode)) {
284 error = inode_newsize_ok(inode, attr->ia_size);
285 if (error)
286 goto out_unlock;
287
288 truncate_setsize(inode, attr->ia_size);
289 hpfs_truncate(inode);
290 }
291
292 setattr_copy(&nop_mnt_idmap, inode, attr);
293
294 hpfs_write_inode(inode);
295
296 out_unlock:
297 hpfs_unlock(inode->i_sb);
298 return error;
299 }
300
301 void hpfs_write_if_changed(struct inode *inode)
302 {
303 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
304
305 if (hpfs_inode->i_dirty)
306 hpfs_write_inode(inode);
307 }
308
309 void hpfs_evict_inode(struct inode *inode)
310 {
311 truncate_inode_pages_final(&inode->i_data);
312 clear_inode(inode);
313 if (!inode->i_nlink) {
314 hpfs_lock(inode->i_sb);
315 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
316 hpfs_unlock(inode->i_sb);
317 }
318 }
319
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