| /* |
| * linux/fs/hpfs/dir.c |
| * |
| * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 |
| * |
| * directory VFS functions |
| */ |
| |
| #include <linux/slab.h> |
| #include "hpfs_fn.h" |
| |
| static int hpfs_dir_release(struct inode *inode, struct file *filp) |
| { |
| hpfs_lock(inode->i_sb); |
| hpfs_del_pos(inode, &filp->f_pos); |
| /*hpfs_write_if_changed(inode);*/ |
| hpfs_unlock(inode->i_sb); |
| return 0; |
| } |
| |
| /* This is slow, but it's not used often */ |
| |
| static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) |
| { |
| loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); |
| loff_t pos; |
| struct quad_buffer_head qbh; |
| struct inode *i = filp->f_path.dentry->d_inode; |
| struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
| struct super_block *s = i->i_sb; |
| |
| /* Somebody else will have to figure out what to do here */ |
| if (whence == SEEK_DATA || whence == SEEK_HOLE) |
| return -EINVAL; |
| |
| hpfs_lock(s); |
| |
| /*printk("dir lseek\n");*/ |
| if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; |
| mutex_lock(&i->i_mutex); |
| pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; |
| while (pos != new_off) { |
| if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); |
| else goto fail; |
| if (pos == 12) goto fail; |
| } |
| mutex_unlock(&i->i_mutex); |
| ok: |
| hpfs_unlock(s); |
| return filp->f_pos = new_off; |
| fail: |
| mutex_unlock(&i->i_mutex); |
| /*printk("illegal lseek: %016llx\n", new_off);*/ |
| hpfs_unlock(s); |
| return -ESPIPE; |
| } |
| |
| static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| { |
| struct inode *inode = filp->f_path.dentry->d_inode; |
| struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
| struct quad_buffer_head qbh; |
| struct hpfs_dirent *de; |
| int lc; |
| long old_pos; |
| unsigned char *tempname; |
| int c1, c2 = 0; |
| int ret = 0; |
| |
| hpfs_lock(inode->i_sb); |
| |
| if (hpfs_sb(inode->i_sb)->sb_chk) { |
| if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { |
| ret = -EFSERROR; |
| goto out; |
| } |
| if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { |
| ret = -EFSERROR; |
| goto out; |
| } |
| } |
| if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { |
| struct buffer_head *bh; |
| struct fnode *fno; |
| int e = 0; |
| if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { |
| ret = -EIOERROR; |
| goto out; |
| } |
| if (!fno->dirflag) { |
| e = 1; |
| hpfs_error(inode->i_sb, "not a directory, fnode %08lx", |
| (unsigned long)inode->i_ino); |
| } |
| if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { |
| e = 1; |
| hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, le32_to_cpu(fno->u.external[0].disk_secno)); |
| } |
| brelse(bh); |
| if (e) { |
| ret = -EFSERROR; |
| goto out; |
| } |
| } |
| lc = hpfs_sb(inode->i_sb)->sb_lowercase; |
| if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ |
| filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ |
| goto out; |
| } |
| if (filp->f_pos == 13) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| while (1) { |
| again: |
| /* This won't work when cycle is longer than number of dirents |
| accepted by filldir, but what can I do? |
| maybe killall -9 ls helps */ |
| if (hpfs_sb(inode->i_sb)->sb_chk) |
| if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { |
| ret = -EFSERROR; |
| goto out; |
| } |
| if (filp->f_pos == 12) |
| goto out; |
| if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { |
| printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); |
| goto out; |
| } |
| if (filp->f_pos == 0) { |
| if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) |
| goto out; |
| filp->f_pos = 11; |
| } |
| if (filp->f_pos == 11) { |
| if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) |
| goto out; |
| filp->f_pos = 1; |
| } |
| if (filp->f_pos == 1) { |
| filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; |
| hpfs_add_pos(inode, &filp->f_pos); |
| filp->f_version = inode->i_version; |
| } |
| old_pos = filp->f_pos; |
| if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { |
| ret = -EIOERROR; |
| goto out; |
| } |
| if (de->first || de->last) { |
| if (hpfs_sb(inode->i_sb)->sb_chk) { |
| if (de->first && !de->last && (de->namelen != 2 |
| || de ->name[0] != 1 || de->name[1] != 1)) |
| hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); |
| if (de->last && (de->namelen != 1 || de ->name[0] != 255)) |
| hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); |
| } |
| hpfs_brelse4(&qbh); |
| goto again; |
| } |
| tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); |
| if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) { |
| filp->f_pos = old_pos; |
| if (tempname != de->name) kfree(tempname); |
| hpfs_brelse4(&qbh); |
| goto out; |
| } |
| if (tempname != de->name) kfree(tempname); |
| hpfs_brelse4(&qbh); |
| } |
| out: |
| hpfs_unlock(inode->i_sb); |
| return ret; |
| } |
| |
| /* |
| * lookup. Search the specified directory for the specified name, set |
| * *result to the corresponding inode. |
| * |
| * lookup uses the inode number to tell read_inode whether it is reading |
| * the inode of a directory or a file -- file ino's are odd, directory |
| * ino's are even. read_inode avoids i/o for file inodes; everything |
| * needed is up here in the directory. (And file fnodes are out in |
| * the boondocks.) |
| * |
| * - M.P.: this is over, sometimes we've got to read file's fnode for eas |
| * inode numbers are just fnode sector numbers; iget lock is used |
| * to tell read_inode to read fnode or not. |
| */ |
| |
| struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
| { |
| const unsigned char *name = dentry->d_name.name; |
| unsigned len = dentry->d_name.len; |
| struct quad_buffer_head qbh; |
| struct hpfs_dirent *de; |
| ino_t ino; |
| int err; |
| struct inode *result = NULL; |
| struct hpfs_inode_info *hpfs_result; |
| |
| hpfs_lock(dir->i_sb); |
| if ((err = hpfs_chk_name(name, &len))) { |
| if (err == -ENAMETOOLONG) { |
| hpfs_unlock(dir->i_sb); |
| return ERR_PTR(-ENAMETOOLONG); |
| } |
| goto end_add; |
| } |
| |
| /* |
| * '.' and '..' will never be passed here. |
| */ |
| |
| de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); |
| |
| /* |
| * This is not really a bailout, just means file not found. |
| */ |
| |
| if (!de) goto end; |
| |
| /* |
| * Get inode number, what we're after. |
| */ |
| |
| ino = le32_to_cpu(de->fnode); |
| |
| /* |
| * Go find or make an inode. |
| */ |
| |
| result = iget_locked(dir->i_sb, ino); |
| if (!result) { |
| hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); |
| goto bail1; |
| } |
| if (result->i_state & I_NEW) { |
| hpfs_init_inode(result); |
| if (de->directory) |
| hpfs_read_inode(result); |
| else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) |
| hpfs_read_inode(result); |
| else { |
| result->i_mode |= S_IFREG; |
| result->i_mode &= ~0111; |
| result->i_op = &hpfs_file_iops; |
| result->i_fop = &hpfs_file_ops; |
| set_nlink(result, 1); |
| } |
| unlock_new_inode(result); |
| } |
| hpfs_result = hpfs_i(result); |
| if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; |
| |
| if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { |
| hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures"); |
| goto bail1; |
| } |
| |
| /* |
| * Fill in the info from the directory if this is a newly created |
| * inode. |
| */ |
| |
| if (!result->i_ctime.tv_sec) { |
| if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) |
| result->i_ctime.tv_sec = 1; |
| result->i_ctime.tv_nsec = 0; |
| result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); |
| result->i_mtime.tv_nsec = 0; |
| result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); |
| result->i_atime.tv_nsec = 0; |
| hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); |
| if (!hpfs_result->i_ea_mode && de->read_only) |
| result->i_mode &= ~0222; |
| if (!de->directory) { |
| if (result->i_size == -1) { |
| result->i_size = le32_to_cpu(de->file_size); |
| result->i_data.a_ops = &hpfs_aops; |
| hpfs_i(result)->mmu_private = result->i_size; |
| /* |
| * i_blocks should count the fnode and any anodes. |
| * We count 1 for the fnode and don't bother about |
| * anodes -- the disk heads are on the directory band |
| * and we want them to stay there. |
| */ |
| result->i_blocks = 1 + ((result->i_size + 511) >> 9); |
| } |
| } |
| } |
| |
| hpfs_brelse4(&qbh); |
| |
| /* |
| * Made it. |
| */ |
| |
| end: |
| end_add: |
| hpfs_unlock(dir->i_sb); |
| d_add(dentry, result); |
| return NULL; |
| |
| /* |
| * Didn't. |
| */ |
| bail1: |
| |
| hpfs_brelse4(&qbh); |
| |
| /*bail:*/ |
| |
| hpfs_unlock(dir->i_sb); |
| return ERR_PTR(-ENOENT); |
| } |
| |
| const struct file_operations hpfs_dir_ops = |
| { |
| .llseek = hpfs_dir_lseek, |
| .read = generic_read_dir, |
| .readdir = hpfs_readdir, |
| .release = hpfs_dir_release, |
| .fsync = hpfs_file_fsync, |
| }; |