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TOMOYO Linux Cross Reference
Linux/fs/hpfs/inode.c

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  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         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                 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, i->i_mtime.tv_sec));
234                 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
235                 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
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, i->i_mtime.tv_sec));
244                         de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
245                         de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
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 dentry *dentry, struct iattr *attr)
261 {
262         struct inode *inode = d_inode(dentry);
263         int error = -EINVAL;
264 
265         hpfs_lock(inode->i_sb);
266         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
267                 goto out_unlock;
268         if ((attr->ia_valid & ATTR_UID) &&
269             from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
270                 goto out_unlock;
271         if ((attr->ia_valid & ATTR_GID) &&
272             from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
273                 goto out_unlock;
274         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
275                 goto out_unlock;
276 
277         error = setattr_prepare(dentry, attr);
278         if (error)
279                 goto out_unlock;
280 
281         if ((attr->ia_valid & ATTR_SIZE) &&
282             attr->ia_size != i_size_read(inode)) {
283                 error = inode_newsize_ok(inode, attr->ia_size);
284                 if (error)
285                         goto out_unlock;
286 
287                 truncate_setsize(inode, attr->ia_size);
288                 hpfs_truncate(inode);
289         }
290 
291         setattr_copy(inode, attr);
292 
293         hpfs_write_inode(inode);
294 
295  out_unlock:
296         hpfs_unlock(inode->i_sb);
297         return error;
298 }
299 
300 void hpfs_write_if_changed(struct inode *inode)
301 {
302         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
303 
304         if (hpfs_inode->i_dirty)
305                 hpfs_write_inode(inode);
306 }
307 
308 void hpfs_evict_inode(struct inode *inode)
309 {
310         truncate_inode_pages_final(&inode->i_data);
311         clear_inode(inode);
312         if (!inode->i_nlink) {
313                 hpfs_lock(inode->i_sb);
314                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
315                 hpfs_unlock(inode->i_sb);
316         }
317 }
318 

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