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_size = -1; 21 i->i_blocks = -1; 22 23 hpfs_inode->i_dno = 0; 24 hpfs_inode->i_n_secs = 0; 25 hpfs_inode->i_file_sec = 0; 26 hpfs_inode->i_disk_sec = 0; 27 hpfs_inode->i_dpos = 0; 28 hpfs_inode->i_dsubdno = 0; 29 hpfs_inode->i_ea_mode = 0; 30 hpfs_inode->i_ea_uid = 0; 31 hpfs_inode->i_ea_gid = 0; 32 hpfs_inode->i_ea_size = 0; 33 34 hpfs_inode->i_rddir_off = NULL; 35 hpfs_inode->i_dirty = 0; 36 37 i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0; 38 i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0; 39 i->i_atime.tv_sec = i->i_atime.tv_nsec = 0; 40 } 41 42 void hpfs_read_inode(struct inode *i) 43 { 44 struct buffer_head *bh; 45 struct fnode *fnode; 46 struct super_block *sb = i->i_sb; 47 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 48 unsigned char *ea; 49 int ea_size; 50 51 if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) { 52 /*i->i_mode |= S_IFREG; 53 i->i_mode &= ~0111; 54 i->i_op = &hpfs_file_iops; 55 i->i_fop = &hpfs_file_ops; 56 i->i_nlink = 0;*/ 57 make_bad_inode(i); 58 return; 59 } 60 if (hpfs_sb(i->i_sb)->sb_eas) { 61 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) { 62 if (ea_size == 2) { 63 i->i_uid = le16_to_cpu(*(__le16*)ea); 64 hpfs_inode->i_ea_uid = 1; 65 } 66 kfree(ea); 67 } 68 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) { 69 if (ea_size == 2) { 70 i->i_gid = le16_to_cpu(*(__le16*)ea); 71 hpfs_inode->i_ea_gid = 1; 72 } 73 kfree(ea); 74 } 75 if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) { 76 kfree(ea); 77 i->i_mode = S_IFLNK | 0777; 78 i->i_op = &page_symlink_inode_operations; 79 i->i_data.a_ops = &hpfs_symlink_aops; 80 i->i_nlink = 1; 81 i->i_size = ea_size; 82 i->i_blocks = 1; 83 brelse(bh); 84 return; 85 } 86 if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) { 87 int rdev = 0; 88 umode_t mode = hpfs_sb(sb)->sb_mode; 89 if (ea_size == 2) { 90 mode = le16_to_cpu(*(__le16*)ea); 91 hpfs_inode->i_ea_mode = 1; 92 } 93 kfree(ea); 94 i->i_mode = mode; 95 if (S_ISBLK(mode) || S_ISCHR(mode)) { 96 if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) { 97 if (ea_size == 4) 98 rdev = le32_to_cpu(*(__le32*)ea); 99 kfree(ea); 100 } 101 } 102 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 103 brelse(bh); 104 i->i_nlink = 1; 105 i->i_size = 0; 106 i->i_blocks = 1; 107 init_special_inode(i, mode, 108 new_decode_dev(rdev)); 109 return; 110 } 111 } 112 } 113 if (fnode->dirflag) { 114 unsigned n_dnodes, n_subdirs; 115 i->i_mode |= S_IFDIR; 116 i->i_op = &hpfs_dir_iops; 117 i->i_fop = &hpfs_dir_ops; 118 hpfs_inode->i_parent_dir = fnode->up; 119 hpfs_inode->i_dno = fnode->u.external[0].disk_secno; 120 if (hpfs_sb(sb)->sb_chk >= 2) { 121 struct buffer_head *bh0; 122 if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0); 123 } 124 n_dnodes = 0; n_subdirs = 0; 125 hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL); 126 i->i_blocks = 4 * n_dnodes; 127 i->i_size = 2048 * n_dnodes; 128 i->i_nlink = 2 + n_subdirs; 129 } else { 130 i->i_mode |= S_IFREG; 131 if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111; 132 i->i_op = &hpfs_file_iops; 133 i->i_fop = &hpfs_file_ops; 134 i->i_nlink = 1; 135 i->i_size = fnode->file_size; 136 i->i_blocks = ((i->i_size + 511) >> 9) + 1; 137 i->i_data.a_ops = &hpfs_aops; 138 hpfs_i(i)->mmu_private = i->i_size; 139 } 140 brelse(bh); 141 } 142 143 static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode) 144 { 145 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 146 /*if (fnode->acl_size_l || fnode->acl_size_s) { 147 Some unknown structures like ACL may be in fnode, 148 we'd better not overwrite them 149 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino); 150 } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) { 151 __le32 ea; 152 if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) { 153 ea = cpu_to_le32(i->i_uid); 154 hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2); 155 hpfs_inode->i_ea_uid = 1; 156 } 157 if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) { 158 ea = cpu_to_le32(i->i_gid); 159 hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2); 160 hpfs_inode->i_ea_gid = 1; 161 } 162 if (!S_ISLNK(i->i_mode)) 163 if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111)) 164 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG)) 165 && i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333)) 166 | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) { 167 ea = cpu_to_le32(i->i_mode); 168 /* sick, but legal */ 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 mutex_lock(&hpfs_inode->i_parent_mutex); 190 if (!i->i_nlink) { 191 mutex_unlock(&hpfs_inode->i_parent_mutex); 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 mutex_lock(&hpfs_inode->i_mutex); 203 hpfs_write_inode_nolock(i); 204 mutex_unlock(&hpfs_inode->i_mutex); 205 iput(parent); 206 } else { 207 mark_inode_dirty(i); 208 } 209 mutex_unlock(&hpfs_inode->i_parent_mutex); 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 255 hpfs_error(i->i_sb, 256 "directory %08lx doesn't have '.' entry", 257 (unsigned long)i->i_ino); 258 } 259 mark_buffer_dirty(bh); 260 brelse(bh); 261 } 262 263 int hpfs_setattr(struct dentry *dentry, struct iattr *attr) 264 { 265 struct inode *inode = dentry->d_inode; 266 int error = -EINVAL; 267 268 lock_kernel(); 269 if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) 270 goto out_unlock; 271 if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) 272 goto out_unlock; 273 274 error = inode_change_ok(inode, attr); 275 if (error) 276 goto out_unlock; 277 278 error = inode_setattr(inode, attr); 279 if (error) 280 goto out_unlock; 281 282 hpfs_write_inode(inode); 283 284 out_unlock: 285 unlock_kernel(); 286 return error; 287 } 288 289 void hpfs_write_if_changed(struct inode *inode) 290 { 291 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 292 293 if (hpfs_inode->i_dirty) 294 hpfs_write_inode(inode); 295 } 296 297 void hpfs_delete_inode(struct inode *inode) 298 { 299 truncate_inode_pages(&inode->i_data, 0); 300 lock_kernel(); 301 hpfs_remove_fnode(inode->i_sb, inode->i_ino); 302 unlock_kernel(); 303 clear_inode(inode); 304 } 305