[CIFS] Fix large (ie over 64K for MaxCIFSBufSize) buffer case for wrapping
[linux-2.6] / fs / hpfs / inode.c
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 "hpfs_fn.h"
10
11 void hpfs_init_inode(struct inode *i)
12 {
13         struct super_block *sb = i->i_sb;
14         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
15
16         i->i_uid = hpfs_sb(sb)->sb_uid;
17         i->i_gid = hpfs_sb(sb)->sb_gid;
18         i->i_mode = hpfs_sb(sb)->sb_mode;
19         hpfs_inode->i_conv = hpfs_sb(sb)->sb_conv;
20         i->i_blksize = 512;
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         unsigned char *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                 i->i_nlink = 0;*/
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->i_uid = le16_to_cpu(*(u16*)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->i_gid = le16_to_cpu(*(u16*)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                         i->i_data.a_ops = &hpfs_symlink_aops;
81                         i->i_nlink = 1;
82                         i->i_size = ea_size;
83                         i->i_blocks = 1;
84                         brelse(bh);
85                         return;
86                 }
87                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
88                         int rdev = 0;
89                         umode_t mode = hpfs_sb(sb)->sb_mode;
90                         if (ea_size == 2) {
91                                 mode = le16_to_cpu(*(u16*)ea);
92                                 hpfs_inode->i_ea_mode = 1;
93                         }
94                         kfree(ea);
95                         i->i_mode = mode;
96                         if (S_ISBLK(mode) || S_ISCHR(mode)) {
97                                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
98                                         if (ea_size == 4)
99                                                 rdev = le32_to_cpu(*(u32*)ea);
100                                         kfree(ea);
101                                 }
102                         }
103                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
104                                 brelse(bh);
105                                 i->i_nlink = 1;
106                                 i->i_size = 0;
107                                 i->i_blocks = 1;
108                                 init_special_inode(i, mode,
109                                         new_decode_dev(rdev));
110                                 return;
111                         }
112                 }
113         }
114         if (fnode->dirflag) {
115                 unsigned n_dnodes, n_subdirs;
116                 i->i_mode |= S_IFDIR;
117                 i->i_op = &hpfs_dir_iops;
118                 i->i_fop = &hpfs_dir_ops;
119                 hpfs_inode->i_parent_dir = fnode->up;
120                 hpfs_inode->i_dno = fnode->u.external[0].disk_secno;
121                 if (hpfs_sb(sb)->sb_chk >= 2) {
122                         struct buffer_head *bh0;
123                         if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0);
124                 }
125                 n_dnodes = 0; n_subdirs = 0;
126                 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL);
127                 i->i_blocks = 4 * n_dnodes;
128                 i->i_size = 2048 * n_dnodes;
129                 i->i_nlink = 2 + n_subdirs;
130         } else {
131                 i->i_mode |= S_IFREG;
132                 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111;
133                 i->i_op = &hpfs_file_iops;
134                 i->i_fop = &hpfs_file_ops;
135                 i->i_nlink = 1;
136                 i->i_size = fnode->file_size;
137                 i->i_blocks = ((i->i_size + 511) >> 9) + 1;
138                 i->i_data.a_ops = &hpfs_aops;
139                 hpfs_i(i)->mmu_private = i->i_size;
140         }
141         brelse(bh);
142 }
143
144 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
145 {
146         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
147         /*if (fnode->acl_size_l || fnode->acl_size_s) {
148                    Some unknown structures like ACL may be in fnode,
149                    we'd better not overwrite them
150                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
151         } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
152                 u32 ea;
153                 if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
154                         ea = cpu_to_le32(i->i_uid);
155                         hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
156                         hpfs_inode->i_ea_uid = 1;
157                 }
158                 if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
159                         ea = cpu_to_le32(i->i_gid);
160                         hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
161                         hpfs_inode->i_ea_gid = 1;
162                 }
163                 if (!S_ISLNK(i->i_mode))
164                         if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
165                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
166                           && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
167                           | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) {
168                                 ea = cpu_to_le32(i->i_mode);
169                                 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
170                                 hpfs_inode->i_ea_mode = 1;
171                         }
172                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
173                         ea = cpu_to_le32(new_encode_dev(i->i_rdev));
174                         hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
175                 }
176         }
177 }
178
179 void hpfs_write_inode(struct inode *i)
180 {
181         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
182         struct inode *parent;
183         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
184         if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
185                 if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n");
186                 kfree(hpfs_inode->i_rddir_off);
187                 hpfs_inode->i_rddir_off = NULL;
188         }
189         down(&hpfs_inode->i_parent);
190         if (!i->i_nlink) {
191                 up(&hpfs_inode->i_parent);
192                 return;
193         }
194         parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
195         if (parent) {
196                 hpfs_inode->i_dirty = 0;
197                 if (parent->i_state & I_NEW) {
198                         hpfs_init_inode(parent);
199                         hpfs_read_inode(parent);
200                         unlock_new_inode(parent);
201                 }
202                 down(&hpfs_inode->i_sem);
203                 hpfs_write_inode_nolock(i);
204                 up(&hpfs_inode->i_sem);
205                 iput(parent);
206         } else {
207                 mark_inode_dirty(i);
208         }
209         up(&hpfs_inode->i_parent);
210 }
211
212 void hpfs_write_inode_nolock(struct inode *i)
213 {
214         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
215         struct buffer_head *bh;
216         struct fnode *fnode;
217         struct quad_buffer_head qbh;
218         struct hpfs_dirent *de;
219         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
220         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
221         if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
222                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
223                         brelse(bh);
224                         return;
225                 }
226         } else de = NULL;
227         if (S_ISREG(i->i_mode)) {
228                 fnode->file_size = i->i_size;
229                 if (de) de->file_size = i->i_size;
230         } else if (S_ISDIR(i->i_mode)) {
231                 fnode->file_size = 0;
232                 if (de) de->file_size = 0;
233         }
234         hpfs_write_inode_ea(i, fnode);
235         if (de) {
236                 de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec);
237                 de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec);
238                 de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec);
239                 de->read_only = !(i->i_mode & 0222);
240                 de->ea_size = hpfs_inode->i_ea_size;
241                 hpfs_mark_4buffers_dirty(&qbh);
242                 hpfs_brelse4(&qbh);
243         }
244         if (S_ISDIR(i->i_mode)) {
245                 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
246                         de->write_date = gmt_to_local(i->i_sb, i->i_mtime.tv_sec);
247                         de->read_date = gmt_to_local(i->i_sb, i->i_atime.tv_sec);
248                         de->creation_date = gmt_to_local(i->i_sb, i->i_ctime.tv_sec);
249                         de->read_only = !(i->i_mode & 0222);
250                         de->ea_size = /*hpfs_inode->i_ea_size*/0;
251                         de->file_size = 0;
252                         hpfs_mark_4buffers_dirty(&qbh);
253                         hpfs_brelse4(&qbh);
254                 } else hpfs_error(i->i_sb, "directory %08x doesn't have '.' entry", i->i_ino);
255         }
256         mark_buffer_dirty(bh);
257         brelse(bh);
258 }
259
260 int hpfs_notify_change(struct dentry *dentry, struct iattr *attr)
261 {
262         struct inode *inode = dentry->d_inode;
263         int error=0;
264         lock_kernel();
265         if ( ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) ||
266              (hpfs_sb(inode->i_sb)->sb_root == inode->i_ino) ) {
267                 error = -EINVAL;
268         } else if ((error = inode_change_ok(inode, attr))) {
269         } else if ((error = inode_setattr(inode, attr))) {
270         } else {
271                 hpfs_write_inode(inode);
272         }
273         unlock_kernel();
274         return error;
275 }
276
277 void hpfs_write_if_changed(struct inode *inode)
278 {
279         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
280
281         if (hpfs_inode->i_dirty)
282                 hpfs_write_inode(inode);
283 }
284
285 void hpfs_delete_inode(struct inode *inode)
286 {
287         truncate_inode_pages(&inode->i_data, 0);
288         lock_kernel();
289         hpfs_remove_fnode(inode->i_sb, inode->i_ino);
290         unlock_kernel();
291         clear_inode(inode);
292 }