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 = inode_change_ok(inode, 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