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

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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/slab.h>
 10 #include <linux/user_namespace.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         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 
 43 void 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                 /*i->i_mode |= S_IFREG;
 54                 i->i_mode &= ~0111;
 55                 i->i_op = &hpfs_file_iops;
 56                 i->i_fop = &hpfs_file_ops;
 57                 clear_nlink(i);*/
 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 
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 (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(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 structures", i->i_ino);
152         } else*/ 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                                 /* 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)
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 
208 void 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(/*hpfs_inode->i_ea_size*/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 
259 int 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 
299 void 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 
307 void 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 

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