linux/fs/hpfs/inode.c
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   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
  13void 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
  43void 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
 144static 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 stuctures", 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
 180void 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) printk("HPFS: write_inode: some position still there\n");
 187                kfree(hpfs_inode->i_rddir_off);
 188                hpfs_inode->i_rddir_off = NULL;
 189        }
 190        if (!i->i_nlink) {
 191                return;
 192        }
 193        parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir);
 194        if (parent) {
 195                hpfs_inode->i_dirty = 0;
 196                if (parent->i_state & I_NEW) {
 197                        hpfs_init_inode(parent);
 198                        hpfs_read_inode(parent);
 199                        unlock_new_inode(parent);
 200                }
 201                hpfs_write_inode_nolock(i);
 202                iput(parent);
 203        }
 204}
 205
 206void hpfs_write_inode_nolock(struct inode *i)
 207{
 208        struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
 209        struct buffer_head *bh;
 210        struct fnode *fnode;
 211        struct quad_buffer_head qbh;
 212        struct hpfs_dirent *de;
 213        if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
 214        if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
 215        if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) {
 216                if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
 217                        brelse(bh);
 218                        return;
 219                }
 220        } else de = NULL;
 221        if (S_ISREG(i->i_mode)) {
 222                fnode->file_size = cpu_to_le32(i->i_size);
 223                if (de) de->file_size = cpu_to_le32(i->i_size);
 224        } else if (S_ISDIR(i->i_mode)) {
 225                fnode->file_size = cpu_to_le32(0);
 226                if (de) de->file_size = cpu_to_le32(0);
 227        }
 228        hpfs_write_inode_ea(i, fnode);
 229        if (de) {
 230                de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 231                de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 232                de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 233                de->read_only = !(i->i_mode & 0222);
 234                de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size);
 235                hpfs_mark_4buffers_dirty(&qbh);
 236                hpfs_brelse4(&qbh);
 237        }
 238        if (S_ISDIR(i->i_mode)) {
 239                if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) {
 240                        de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec));
 241                        de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec));
 242                        de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec));
 243                        de->read_only = !(i->i_mode & 0222);
 244                        de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0);
 245                        de->file_size = cpu_to_le32(0);
 246                        hpfs_mark_4buffers_dirty(&qbh);
 247                        hpfs_brelse4(&qbh);
 248                } else
 249                        hpfs_error(i->i_sb,
 250                                "directory %08lx doesn't have '.' entry",
 251                                (unsigned long)i->i_ino);
 252        }
 253        mark_buffer_dirty(bh);
 254        brelse(bh);
 255}
 256
 257int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
 258{
 259        struct inode *inode = dentry->d_inode;
 260        int error = -EINVAL;
 261
 262        hpfs_lock(inode->i_sb);
 263        if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
 264                goto out_unlock;
 265        if ((attr->ia_valid & ATTR_UID) &&
 266            from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
 267                goto out_unlock;
 268        if ((attr->ia_valid & ATTR_GID) &&
 269            from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
 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        if ((attr->ia_valid & ATTR_SIZE) &&
 279            attr->ia_size != i_size_read(inode)) {
 280                error = vmtruncate(inode, attr->ia_size);
 281                if (error)
 282                        goto out_unlock;
 283        }
 284
 285        setattr_copy(inode, attr);
 286
 287        hpfs_write_inode(inode);
 288
 289 out_unlock:
 290        hpfs_unlock(inode->i_sb);
 291        return error;
 292}
 293
 294void hpfs_write_if_changed(struct inode *inode)
 295{
 296        struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
 297
 298        if (hpfs_inode->i_dirty)
 299                hpfs_write_inode(inode);
 300}
 301
 302void hpfs_evict_inode(struct inode *inode)
 303{
 304        truncate_inode_pages(&inode->i_data, 0);
 305        clear_inode(inode);
 306        if (!inode->i_nlink) {
 307                hpfs_lock(inode->i_sb);
 308                hpfs_remove_fnode(inode->i_sb, inode->i_ino);
 309                hpfs_unlock(inode->i_sb);
 310        }
 311}
 312
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