kernel/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 <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                         i->i_data.a_ops = &hpfs_symlink_aops;
  81                         set_nlink(i, 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(*(__le16*)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(*(__le32*)ea);
 100                                         kfree(ea);
 101                                 }
 102                         }
 103                         if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
 104                                 brelse(bh);
 105                                 set_nlink(i, 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_is_dir(fnode)) {
 115                 int 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 = le32_to_cpu(fnode->up);
 120                 hpfs_inode->i_dno = le32_to_cpu(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                 set_nlink(i, 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                 set_nlink(i, 1);
 136                 i->i_size = le32_to_cpu(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 (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(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 structures", i->i_ino);
 151         } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
 152                 __le32 ea;
 153                 if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
 154                         ea = cpu_to_le32(i_uid_read(i));
 155                         hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
 156                         hpfs_inode->i_ea_uid = 1;
 157                 }
 158                 if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
 159                         ea = cpu_to_le32(i_gid_read(i));
 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                                 /* sick, but legal */
 170                                 hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2);
 171                                 hpfs_inode->i_ea_mode = 1;
 172                         }
 173                 if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
 174                         ea = cpu_to_le32(new_encode_dev(i->i_rdev));
 175                         hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4);
 176                 }
 177         }
 178 }
 179
 180 void hpfs_write_inode(struct inode *i)
 181 {
 182         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 183         struct inode *parent;
 184         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 185         if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
 186                 if (*hpfs_inode->i_rddir_off)
 187                         pr_err("write_inode: some position still there\n");
 188                 kfree(hpfs_inode->i_rddir_off);
 189                 hpfs_inode->i_rddir_off = NULL;
 190         }
 191         if (!i->i_nlink) {
 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                 hpfs_write_inode_nolock(i);
 203                 iput(parent);
 204         }
 205 }
 206
 207 void hpfs_write_inode_nolock(struct inode *i)
 208 {
 209         struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 210         struct buffer_head *bh;
 211         struct fnode *fnode;
 212         struct quad_buffer_head qbh;
 213         struct hpfs_dirent *de;
 214         if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 215         if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 216         if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
 217                 if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 218                         brelse(bh);
 219                         return;
 220                 }
 221         } else de = NULL;
 222         if (S_ISREG(i->i_mode)) {
 223                 fnode->file_size = cpu_to_le32(i->i_size);
 224                 if (de) de->file_size = cpu_to_le32(i->i_size);
 225         } else if (S_ISDIR(i->i_mode)) {
 226                 fnode->file_size = cpu_to_le32(0);
 227                 if (de) de->file_size = cpu_to_le32(0);
 228         }
 229         hpfs_write_inode_ea(i, fnode);
 230         if (de) {
 231                 de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 232                 de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 233                 de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 234                 de->read_only = !(i->i_mode & 0222);
 235                 de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
 236                 hpfs_mark_4buffers_dirty(&qbh);
 237                 hpfs_brelse4(&qbh);
 238         }
 239         if (S_ISDIR(i->i_mode)) {
 240                 if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
 241                         de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 242                         de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 243                         de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 244                         de->read_only = !(i->i_mode & 0222);
 245                         de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
 246                         de->file_size = cpu_to_le32(0);
 247                         hpfs_mark_4buffers_dirty(&qbh);
 248                         hpfs_brelse4(&qbh);
 249                 } else
 250                         hpfs_error(i->i_sb,
 251                                 "directory %08lx doesn't have '.' entry",
 252                                 (unsigned long)i->i_ino);
 253         }
 254         mark_buffer_dirty(bh);
 255         brelse(bh);
 256 }
 257
 258 int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 259 {
 260         struct inode *inode = d_inode(dentry);
 261         int error = -EINVAL;
 262
 263         hpfs_lock(inode->i_sb);
 264         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 265                 goto out_unlock;
 266         if ((attr->ia_valid & ATTR_UID) &&
 267             from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
 268                 goto out_unlock;
 269         if ((attr->ia_valid & ATTR_GID) &&
 270             from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
 271                 goto out_unlock;
 272         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
 273                 goto out_unlock;
 274
 275         error = inode_change_ok(inode, attr);
 276         if (error)
 277                 goto out_unlock;
 278
 279         if ((attr->ia_valid & ATTR_SIZE) &&
 280             attr->ia_size != i_size_read(inode)) {
 281                 error = inode_newsize_ok(inode, attr->ia_size);
 282                 if (error)
 283                         goto out_unlock;
 284
 285                 truncate_setsize(inode, attr->ia_size);
 286                 hpfs_truncate(inode);
 287         }
 288
 289         setattr_copy(inode, attr);
 290
 291         hpfs_write_inode(inode);
 292
 293  out_unlock:
 294         hpfs_unlock(inode->i_sb);
 295         return error;
 296 }
 297
 298 void hpfs_write_if_changed(struct inode *inode)
 299 {
 300         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 301
 302         if (hpfs_inode->i_dirty)
 303                 hpfs_write_inode(inode);
 304 }
 305
 306 void hpfs_evict_inode(struct inode *inode)
 307 {
 308         truncate_inode_pages_final(&inode->i_data);
 309         clear_inode(inode);
 310         if (!inode->i_nlink) {
 311                 hpfs_lock(inode->i_sb);
 312                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 313                 hpfs_unlock(inode->i_sb);
 314         }
 315 }