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(inode: 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(inode: i, sec: 0, nsec: 0); |
40 | inode_set_mtime(inode: i, sec: 0, nsec: 0); |
41 | inode_set_atime(inode: i, sec: 0, 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(inode: i); |
50 | void *ea; |
51 | int ea_size; |
52 | |
53 | if (!(fnode = hpfs_map_fnode(s: 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(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(inode: i, le16_to_cpu(*(__le16*)ea)); |
66 | hpfs_inode->i_ea_uid = 1; |
67 | } |
68 | kfree(objp: ea); |
69 | } |
70 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID" , &ea_size))) { |
71 | if (ea_size == 2) { |
72 | i_gid_write(inode: i, le16_to_cpu(*(__le16*)ea)); |
73 | hpfs_inode->i_ea_gid = 1; |
74 | } |
75 | kfree(objp: ea); |
76 | } |
77 | if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK" , &ea_size))) { |
78 | kfree(objp: ea); |
79 | i->i_mode = S_IFLNK | 0777; |
80 | i->i_op = &page_symlink_inode_operations; |
81 | inode_nohighmem(inode: i); |
82 | i->i_data.a_ops = &hpfs_symlink_aops; |
83 | set_nlink(inode: i, nlink: 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(objp: 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(objp: ea); |
103 | } |
104 | } |
105 | if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
106 | brelse(bh); |
107 | set_nlink(inode: i, nlink: 1); |
108 | i->i_size = 0; |
109 | i->i_blocks = 1; |
110 | init_special_inode(i, mode, |
111 | new_decode_dev(dev: rdev)); |
112 | return; |
113 | } |
114 | } |
115 | } |
116 | if (fnode_is_dir(p: 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(s: sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh: 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(inode: i, nlink: 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(inode: i, nlink: 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(inode: 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(inode: 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(sb: i->i_sb)->sb_eas >= 2) { |
154 | __le32 ea; |
155 | if (!uid_eq(left: i->i_uid, right: hpfs_sb(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(left: i->i_gid, right: hpfs_sb(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(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(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(inode: i); |
185 | struct inode *parent; |
186 | if (i->i_ino == hpfs_sb(sb: i->i_sb)->sb_root) return; |
187 | if (hpfs_inode->i_rddir_off && !atomic_read(v: &i->i_count)) { |
188 | if (*hpfs_inode->i_rddir_off) |
189 | pr_err("write_inode: some position still there\n" ); |
190 | kfree(objp: 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(i: parent); |
201 | hpfs_read_inode(i: 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(inode: 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(sb: i->i_sb)->sb_root) return; |
217 | if (!(fnode = hpfs_map_fnode(s: i->i_sb, i->i_ino, &bh))) return; |
218 | if (i->i_ino != hpfs_sb(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(s: inode->i_sb); |
267 | if (inode->i_ino == hpfs_sb(sb: inode->i_sb)->sb_root) |
268 | goto out_unlock; |
269 | if ((attr->ia_valid & ATTR_UID) && |
270 | from_kuid(to: &init_user_ns, uid: attr->ia_uid) >= 0x10000) |
271 | goto out_unlock; |
272 | if ((attr->ia_valid & ATTR_GID) && |
273 | from_kgid(to: &init_user_ns, gid: 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, offset: attr->ia_size); |
285 | if (error) |
286 | goto out_unlock; |
287 | |
288 | truncate_setsize(inode, newsize: attr->ia_size); |
289 | hpfs_truncate(inode); |
290 | } |
291 | |
292 | setattr_copy(&nop_mnt_idmap, inode, attr); |
293 | |
294 | hpfs_write_inode(i: inode); |
295 | |
296 | out_unlock: |
297 | hpfs_unlock(s: 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(i: 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(s: inode->i_sb); |
315 | hpfs_remove_fnode(inode->i_sb, fno: inode->i_ino); |
316 | hpfs_unlock(s: inode->i_sb); |
317 | } |
318 | } |
319 | |