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 "hpfs_fn.h" 11 12 void hpfs_init_inode(struct inode *i) 13 { 14 struct super_block *sb = i->i_sb; 15 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 16 17 i->i_uid = hpfs_sb(sb)->sb_uid; 18 i->i_gid = hpfs_sb(sb)->sb_gid; 19 i->i_mode = hpfs_sb(sb)->sb_mode; 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 void *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 clear_nlink(i);*/ 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 set_nlink(i, 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 set_nlink(i, 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 int 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 = le32_to_cpu(fnode->up); 119 hpfs_inode->i_dno = le32_to_cpu(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 set_nlink(i, 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 set_nlink(i, 1); 135 i->i_size = le32_to_cpu(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 (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(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 if (!i->i_nlink) { 190 return; 191 } 192 parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir); 193 if (parent) { 194 hpfs_inode->i_dirty = 0; 195 if (parent->i_state & I_NEW) { 196 hpfs_init_inode(parent); 197 hpfs_read_inode(parent); 198 unlock_new_inode(parent); 199 } 200 hpfs_write_inode_nolock(i); 201 iput(parent); 202 } 203 } 204 205 void hpfs_write_inode_nolock(struct inode *i) 206 { 207 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 208 struct buffer_head *bh; 209 struct fnode *fnode; 210 struct quad_buffer_head qbh; 211 struct hpfs_dirent *de; 212 if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; 213 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return; 214 if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) { 215 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) { 216 brelse(bh); 217 return; 218 } 219 } else de = NULL; 220 if (S_ISREG(i->i_mode)) { 221 fnode->file_size = cpu_to_le32(i->i_size); 222 if (de) de->file_size = cpu_to_le32(i->i_size); 223 } else if (S_ISDIR(i->i_mode)) { 224 fnode->file_size = cpu_to_le32(0); 225 if (de) de->file_size = cpu_to_le32(0); 226 } 227 hpfs_write_inode_ea(i, fnode); 228 if (de) { 229 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); 230 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); 231 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); 232 de->read_only = !(i->i_mode & 0222); 233 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size); 234 hpfs_mark_4buffers_dirty(&qbh); 235 hpfs_brelse4(&qbh); 236 } 237 if (S_ISDIR(i->i_mode)) { 238 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) { 239 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); 240 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); 241 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); 242 de->read_only = !(i->i_mode & 0222); 243 de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0); 244 de->file_size = cpu_to_le32(0); 245 hpfs_mark_4buffers_dirty(&qbh); 246 hpfs_brelse4(&qbh); 247 } else 248 hpfs_error(i->i_sb, 249 "directory %08lx doesn't have '.' entry", 250 (unsigned long)i->i_ino); 251 } 252 mark_buffer_dirty(bh); 253 brelse(bh); 254 } 255 256 int hpfs_setattr(struct dentry *dentry, struct iattr *attr) 257 { 258 struct inode *inode = dentry->d_inode; 259 int error = -EINVAL; 260 261 hpfs_lock(inode->i_sb); 262 if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) 263 goto out_unlock; 264 if ((attr->ia_valid & ATTR_UID) && attr->ia_uid >= 0x10000) 265 goto out_unlock; 266 if ((attr->ia_valid & ATTR_GID) && attr->ia_gid >= 0x10000) 267 goto out_unlock; 268 if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) 269 goto out_unlock; 270 271 error = inode_change_ok(inode, attr); 272 if (error) 273 goto out_unlock; 274 275 if ((attr->ia_valid & ATTR_SIZE) && 276 attr->ia_size != i_size_read(inode)) { 277 error = vmtruncate(inode, attr->ia_size); 278 if (error) 279 goto out_unlock; 280 } 281 282 setattr_copy(inode, attr); 283 284 hpfs_write_inode(inode); 285 286 out_unlock: 287 hpfs_unlock(inode->i_sb); 288 return error; 289 } 290 291 void hpfs_write_if_changed(struct inode *inode) 292 { 293 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 294 295 if (hpfs_inode->i_dirty) 296 hpfs_write_inode(inode); 297 } 298 299 void hpfs_evict_inode(struct inode *inode) 300 { 301 truncate_inode_pages(&inode->i_data, 0); 302 end_writeback(inode); 303 if (!inode->i_nlink) { 304 hpfs_lock(inode->i_sb); 305 hpfs_remove_fnode(inode->i_sb, inode->i_ino); 306 hpfs_unlock(inode->i_sb); 307 } 308 } 309