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329 lines
8.7 KiB
329 lines
8.7 KiB
// 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 ([email protected]), 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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.compat_ioctl = compat_ptr_ioctl, |
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};
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