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9#include <linux/slab.h>
10#include <linux/user_namespace.h>
11#include "hpfs_fn.h"
12
13void 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 i->i_size = -1;
22 i->i_blocks = -1;
23
24 hpfs_inode->i_dno = 0;
25 hpfs_inode->i_n_secs = 0;
26 hpfs_inode->i_file_sec = 0;
27 hpfs_inode->i_disk_sec = 0;
28 hpfs_inode->i_dpos = 0;
29 hpfs_inode->i_dsubdno = 0;
30 hpfs_inode->i_ea_mode = 0;
31 hpfs_inode->i_ea_uid = 0;
32 hpfs_inode->i_ea_gid = 0;
33 hpfs_inode->i_ea_size = 0;
34
35 hpfs_inode->i_rddir_off = NULL;
36 hpfs_inode->i_dirty = 0;
37
38 i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0;
39 i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0;
40 i->i_atime.tv_sec = i->i_atime.tv_nsec = 0;
41}
42
43void hpfs_read_inode(struct inode *i)
44{
45 struct buffer_head *bh;
46 struct fnode *fnode;
47 struct super_block *sb = i->i_sb;
48 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
49 void *ea;
50 int ea_size;
51
52 if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
53
54
55
56
57
58 make_bad_inode(i);
59 return;
60 }
61 if (hpfs_sb(i->i_sb)->sb_eas) {
62 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
63 if (ea_size == 2) {
64 i_uid_write(i, le16_to_cpu(*(__le16*)ea));
65 hpfs_inode->i_ea_uid = 1;
66 }
67 kfree(ea);
68 }
69 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
70 if (ea_size == 2) {
71 i_gid_write(i, le16_to_cpu(*(__le16*)ea));
72 hpfs_inode->i_ea_gid = 1;
73 }
74 kfree(ea);
75 }
76 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
77 kfree(ea);
78 i->i_mode = S_IFLNK | 0777;
79 i->i_op = &page_symlink_inode_operations;
80 inode_nohighmem(i);
81 i->i_data.a_ops = &hpfs_symlink_aops;
82 set_nlink(i, 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 set_nlink(i, 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_is_dir(fnode)) {
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 = le32_to_cpu(fnode->up);
121 hpfs_inode->i_dno = le32_to_cpu(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 set_nlink(i, 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 set_nlink(i, 1);
137 i->i_size = le32_to_cpu(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
145static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
146{
147 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
148
149
150
151
152 if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
153 __le32 ea;
154 if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
155 ea = cpu_to_le32(i_uid_read(i));
156 hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
157 hpfs_inode->i_ea_uid = 1;
158 }
159 if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
160 ea = cpu_to_le32(i_gid_read(i));
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
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
181void 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)
188 pr_err("write_inode: some position still there\n");
189 kfree(hpfs_inode->i_rddir_off);
190 hpfs_inode->i_rddir_off = NULL;
191 }
192 if (!i->i_nlink) {
193 return;
194 }
195 parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
196 if (parent) {
197 hpfs_inode->i_dirty = 0;
198 if (parent->i_state & I_NEW) {
199 hpfs_init_inode(parent);
200 hpfs_read_inode(parent);
201 unlock_new_inode(parent);
202 }
203 hpfs_write_inode_nolock(i);
204 iput(parent);
205 }
206}
207
208void hpfs_write_inode_nolock(struct inode *i)
209{
210 struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
211 struct buffer_head *bh;
212 struct fnode *fnode;
213 struct quad_buffer_head qbh;
214 struct hpfs_dirent *de;
215 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
216 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
217 if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
218 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
219 brelse(bh);
220 return;
221 }
222 } else de = NULL;
223 if (S_ISREG(i->i_mode)) {
224 fnode->file_size = cpu_to_le32(i->i_size);
225 if (de) de->file_size = cpu_to_le32(i->i_size);
226 } else if (S_ISDIR(i->i_mode)) {
227 fnode->file_size = cpu_to_le32(0);
228 if (de) de->file_size = cpu_to_le32(0);
229 }
230 hpfs_write_inode_ea(i, fnode);
231 if (de) {
232 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
233 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
234 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
235 de->read_only = !(i->i_mode & 0222);
236 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
237 hpfs_mark_4buffers_dirty(&qbh);
238 hpfs_brelse4(&qbh);
239 }
240 if (S_ISDIR(i->i_mode)) {
241 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
242 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
243 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
244 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
245 de->read_only = !(i->i_mode & 0222);
246 de->ea_size = cpu_to_le32(0);
247 de->file_size = cpu_to_le32(0);
248 hpfs_mark_4buffers_dirty(&qbh);
249 hpfs_brelse4(&qbh);
250 } else
251 hpfs_error(i->i_sb,
252 "directory %08lx doesn't have '.' entry",
253 (unsigned long)i->i_ino);
254 }
255 mark_buffer_dirty(bh);
256 brelse(bh);
257}
258
259int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
260{
261 struct inode *inode = d_inode(dentry);
262 int error = -EINVAL;
263
264 hpfs_lock(inode->i_sb);
265 if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
266 goto out_unlock;
267 if ((attr->ia_valid & ATTR_UID) &&
268 from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
269 goto out_unlock;
270 if ((attr->ia_valid & ATTR_GID) &&
271 from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
272 goto out_unlock;
273 if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
274 goto out_unlock;
275
276 error = setattr_prepare(dentry, attr);
277 if (error)
278 goto out_unlock;
279
280 if ((attr->ia_valid & ATTR_SIZE) &&
281 attr->ia_size != i_size_read(inode)) {
282 error = inode_newsize_ok(inode, attr->ia_size);
283 if (error)
284 goto out_unlock;
285
286 truncate_setsize(inode, attr->ia_size);
287 hpfs_truncate(inode);
288 }
289
290 setattr_copy(inode, attr);
291
292 hpfs_write_inode(inode);
293
294 out_unlock:
295 hpfs_unlock(inode->i_sb);
296 return error;
297}
298
299void hpfs_write_if_changed(struct inode *inode)
300{
301 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
302
303 if (hpfs_inode->i_dirty)
304 hpfs_write_inode(inode);
305}
306
307void hpfs_evict_inode(struct inode *inode)
308{
309 truncate_inode_pages_final(&inode->i_data);
310 clear_inode(inode);
311 if (!inode->i_nlink) {
312 hpfs_lock(inode->i_sb);
313 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
314 hpfs_unlock(inode->i_sb);
315 }
316}
317
