The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/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 
   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 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 
  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) 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 
  206 void 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 
  257 int 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 = inode_newsize_ok(inode, attr->ia_size);
  281                 if (error)
  282                         goto out_unlock;
  283 
  284                 truncate_setsize(inode, attr->ia_size);
  285                 hpfs_truncate(inode);
  286         }
  287 
  288         setattr_copy(inode, attr);
  289 
  290         hpfs_write_inode(inode);
  291 
  292  out_unlock:
  293         hpfs_unlock(inode->i_sb);
  294         return error;
  295 }
  296 
  297 void hpfs_write_if_changed(struct inode *inode)
  298 {
  299         struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
  300 
  301         if (hpfs_inode->i_dirty)
  302                 hpfs_write_inode(inode);
  303 }
  304 
  305 void hpfs_evict_inode(struct inode *inode)
  306 {
  307         truncate_inode_pages(&inode->i_data, 0);
  308         clear_inode(inode);
  309         if (!inode->i_nlink) {
  310                 hpfs_lock(inode->i_sb);
  311                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
  312                 hpfs_unlock(inode->i_sb);
  313         }
  314 }

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