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                         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 = setattr_prepare(dentry, 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 }