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