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499 lines
17 KiB
499 lines
17 KiB
20 years ago
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/*
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* namei.c - NTFS kernel directory inode operations. Part of the Linux-NTFS
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* project.
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*
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* Copyright (c) 2001-2004 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/dcache.h>
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#include <linux/security.h>
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#include "attrib.h"
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#include "debug.h"
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#include "dir.h"
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#include "mft.h"
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#include "ntfs.h"
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/**
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* ntfs_lookup - find the inode represented by a dentry in a directory inode
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* @dir_ino: directory inode in which to look for the inode
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* @dent: dentry representing the inode to look for
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* @nd: lookup nameidata
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*
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* In short, ntfs_lookup() looks for the inode represented by the dentry @dent
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* in the directory inode @dir_ino and if found attaches the inode to the
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* dentry @dent.
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*
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* In more detail, the dentry @dent specifies which inode to look for by
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* supplying the name of the inode in @dent->d_name.name. ntfs_lookup()
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* converts the name to Unicode and walks the contents of the directory inode
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* @dir_ino looking for the converted Unicode name. If the name is found in the
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* directory, the corresponding inode is loaded by calling ntfs_iget() on its
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* inode number and the inode is associated with the dentry @dent via a call to
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* d_splice_alias().
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*
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* If the name is not found in the directory, a NULL inode is inserted into the
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* dentry @dent via a call to d_add(). The dentry is then termed a negative
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* dentry.
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*
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* Only if an actual error occurs, do we return an error via ERR_PTR().
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*
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* In order to handle the case insensitivity issues of NTFS with regards to the
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* dcache and the dcache requiring only one dentry per directory, we deal with
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* dentry aliases that only differ in case in ->ntfs_lookup() while maintaining
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* a case sensitive dcache. This means that we get the full benefit of dcache
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* speed when the file/directory is looked up with the same case as returned by
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* ->ntfs_readdir() but that a lookup for any other case (or for the short file
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* name) will not find anything in dcache and will enter ->ntfs_lookup()
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* instead, where we search the directory for a fully matching file name
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* (including case) and if that is not found, we search for a file name that
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* matches with different case and if that has non-POSIX semantics we return
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* that. We actually do only one search (case sensitive) and keep tabs on
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* whether we have found a case insensitive match in the process.
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*
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* To simplify matters for us, we do not treat the short vs long filenames as
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* two hard links but instead if the lookup matches a short filename, we
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* return the dentry for the corresponding long filename instead.
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*
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* There are three cases we need to distinguish here:
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*
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* 1) @dent perfectly matches (i.e. including case) a directory entry with a
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* file name in the WIN32 or POSIX namespaces. In this case
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* ntfs_lookup_inode_by_name() will return with name set to NULL and we
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* just d_splice_alias() @dent.
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* 2) @dent matches (not including case) a directory entry with a file name in
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* the WIN32 namespace. In this case ntfs_lookup_inode_by_name() will return
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* with name set to point to a kmalloc()ed ntfs_name structure containing
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* the properly cased little endian Unicode name. We convert the name to the
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* current NLS code page, search if a dentry with this name already exists
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* and if so return that instead of @dent. At this point things are
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* complicated by the possibility of 'disconnected' dentries due to NFS
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* which we deal with appropriately (see the code comments). The VFS will
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* then destroy the old @dent and use the one we returned. If a dentry is
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* not found, we allocate a new one, d_splice_alias() it, and return it as
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* above.
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* 3) @dent matches either perfectly or not (i.e. we don't care about case) a
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* directory entry with a file name in the DOS namespace. In this case
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* ntfs_lookup_inode_by_name() will return with name set to point to a
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* kmalloc()ed ntfs_name structure containing the mft reference (cpu endian)
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* of the inode. We use the mft reference to read the inode and to find the
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* file name in the WIN32 namespace corresponding to the matched short file
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* name. We then convert the name to the current NLS code page, and proceed
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* searching for a dentry with this name, etc, as in case 2), above.
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*
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* Locking: Caller must hold i_sem on the directory.
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*/
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static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
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struct nameidata *nd)
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{
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ntfs_volume *vol = NTFS_SB(dir_ino->i_sb);
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struct inode *dent_inode;
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ntfschar *uname;
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ntfs_name *name = NULL;
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MFT_REF mref;
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unsigned long dent_ino;
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int uname_len;
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ntfs_debug("Looking up %s in directory inode 0x%lx.",
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dent->d_name.name, dir_ino->i_ino);
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/* Convert the name of the dentry to Unicode. */
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uname_len = ntfs_nlstoucs(vol, dent->d_name.name, dent->d_name.len,
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&uname);
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if (uname_len < 0) {
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ntfs_error(vol->sb, "Failed to convert name to Unicode.");
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return ERR_PTR(uname_len);
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}
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mref = ntfs_lookup_inode_by_name(NTFS_I(dir_ino), uname, uname_len,
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&name);
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kmem_cache_free(ntfs_name_cache, uname);
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if (!IS_ERR_MREF(mref)) {
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dent_ino = MREF(mref);
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ntfs_debug("Found inode 0x%lx. Calling ntfs_iget.", dent_ino);
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dent_inode = ntfs_iget(vol->sb, dent_ino);
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if (likely(!IS_ERR(dent_inode))) {
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/* Consistency check. */
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if (is_bad_inode(dent_inode) || MSEQNO(mref) ==
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NTFS_I(dent_inode)->seq_no ||
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dent_ino == FILE_MFT) {
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/* Perfect WIN32/POSIX match. -- Case 1. */
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if (!name) {
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ntfs_debug("Done. (Case 1.)");
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return d_splice_alias(dent_inode, dent);
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}
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/*
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* We are too indented. Handle imperfect
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* matches and short file names further below.
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*/
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goto handle_name;
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}
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ntfs_error(vol->sb, "Found stale reference to inode "
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"0x%lx (reference sequence number = "
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"0x%x, inode sequence number = 0x%x), "
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"returning -EIO. Run chkdsk.",
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dent_ino, MSEQNO(mref),
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NTFS_I(dent_inode)->seq_no);
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iput(dent_inode);
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dent_inode = ERR_PTR(-EIO);
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} else
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ntfs_error(vol->sb, "ntfs_iget(0x%lx) failed with "
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"error code %li.", dent_ino,
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PTR_ERR(dent_inode));
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if (name)
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kfree(name);
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/* Return the error code. */
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return (struct dentry *)dent_inode;
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}
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/* It is guaranteed that name is no longer allocated at this point. */
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if (MREF_ERR(mref) == -ENOENT) {
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ntfs_debug("Entry was not found, adding negative dentry.");
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/* The dcache will handle negative entries. */
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d_add(dent, NULL);
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ntfs_debug("Done.");
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return NULL;
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}
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ntfs_error(vol->sb, "ntfs_lookup_ino_by_name() failed with error "
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"code %i.", -MREF_ERR(mref));
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return ERR_PTR(MREF_ERR(mref));
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// TODO: Consider moving this lot to a separate function! (AIA)
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handle_name:
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{
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struct dentry *real_dent, *new_dent;
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MFT_RECORD *m;
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ntfs_attr_search_ctx *ctx;
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ntfs_inode *ni = NTFS_I(dent_inode);
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int err;
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struct qstr nls_name;
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nls_name.name = NULL;
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if (name->type != FILE_NAME_DOS) { /* Case 2. */
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ntfs_debug("Case 2.");
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nls_name.len = (unsigned)ntfs_ucstonls(vol,
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(ntfschar*)&name->name, name->len,
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(unsigned char**)&nls_name.name, 0);
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kfree(name);
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} else /* if (name->type == FILE_NAME_DOS) */ { /* Case 3. */
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FILE_NAME_ATTR *fn;
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ntfs_debug("Case 3.");
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kfree(name);
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/* Find the WIN32 name corresponding to the matched DOS name. */
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ni = NTFS_I(dent_inode);
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m = map_mft_record(ni);
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if (IS_ERR(m)) {
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err = PTR_ERR(m);
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m = NULL;
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ctx = NULL;
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goto err_out;
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}
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ctx = ntfs_attr_get_search_ctx(ni, m);
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if (unlikely(!ctx)) {
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err = -ENOMEM;
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goto err_out;
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}
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do {
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ATTR_RECORD *a;
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u32 val_len;
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err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0,
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NULL, 0, ctx);
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if (unlikely(err)) {
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ntfs_error(vol->sb, "Inode corrupt: No WIN32 "
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"namespace counterpart to DOS "
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"file name. Run chkdsk.");
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if (err == -ENOENT)
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err = -EIO;
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goto err_out;
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}
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/* Consistency checks. */
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a = ctx->attr;
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if (a->non_resident || a->flags)
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goto eio_err_out;
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val_len = le32_to_cpu(a->data.resident.value_length);
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if (le16_to_cpu(a->data.resident.value_offset) +
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val_len > le32_to_cpu(a->length))
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goto eio_err_out;
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fn = (FILE_NAME_ATTR*)((u8*)ctx->attr + le16_to_cpu(
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ctx->attr->data.resident.value_offset));
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if ((u32)(fn->file_name_length * sizeof(ntfschar) +
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sizeof(FILE_NAME_ATTR)) > val_len)
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goto eio_err_out;
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} while (fn->file_name_type != FILE_NAME_WIN32);
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/* Convert the found WIN32 name to current NLS code page. */
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nls_name.len = (unsigned)ntfs_ucstonls(vol,
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(ntfschar*)&fn->file_name, fn->file_name_length,
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(unsigned char**)&nls_name.name, 0);
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ntfs_attr_put_search_ctx(ctx);
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unmap_mft_record(ni);
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}
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m = NULL;
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ctx = NULL;
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/* Check if a conversion error occurred. */
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if ((signed)nls_name.len < 0) {
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err = (signed)nls_name.len;
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goto err_out;
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}
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nls_name.hash = full_name_hash(nls_name.name, nls_name.len);
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/*
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* Note: No need for dent->d_lock lock as i_sem is held on the
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* parent inode.
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*/
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/* Does a dentry matching the nls_name exist already? */
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real_dent = d_lookup(dent->d_parent, &nls_name);
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/* If not, create it now. */
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if (!real_dent) {
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real_dent = d_alloc(dent->d_parent, &nls_name);
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kfree(nls_name.name);
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if (!real_dent) {
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err = -ENOMEM;
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goto err_out;
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}
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new_dent = d_splice_alias(dent_inode, real_dent);
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if (new_dent)
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dput(real_dent);
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else
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new_dent = real_dent;
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ntfs_debug("Done. (Created new dentry.)");
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return new_dent;
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}
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kfree(nls_name.name);
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/* Matching dentry exists, check if it is negative. */
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if (real_dent->d_inode) {
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if (unlikely(real_dent->d_inode != dent_inode)) {
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/* This can happen because bad inodes are unhashed. */
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BUG_ON(!is_bad_inode(dent_inode));
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BUG_ON(!is_bad_inode(real_dent->d_inode));
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}
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/*
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* Already have the inode and the dentry attached, decrement
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* the reference count to balance the ntfs_iget() we did
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* earlier on. We found the dentry using d_lookup() so it
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* cannot be disconnected and thus we do not need to worry
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* about any NFS/disconnectedness issues here.
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*/
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iput(dent_inode);
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ntfs_debug("Done. (Already had inode and dentry.)");
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return real_dent;
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}
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/*
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* Negative dentry: instantiate it unless the inode is a directory and
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* has a 'disconnected' dentry (i.e. IS_ROOT and DCACHE_DISCONNECTED),
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* in which case d_move() that in place of the found dentry.
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*/
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if (!S_ISDIR(dent_inode->i_mode)) {
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/* Not a directory; everything is easy. */
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d_instantiate(real_dent, dent_inode);
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ntfs_debug("Done. (Already had negative file dentry.)");
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return real_dent;
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}
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spin_lock(&dcache_lock);
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if (list_empty(&dent_inode->i_dentry)) {
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/*
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* Directory without a 'disconnected' dentry; we need to do
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* d_instantiate() by hand because it takes dcache_lock which
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* we already hold.
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*/
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list_add(&real_dent->d_alias, &dent_inode->i_dentry);
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real_dent->d_inode = dent_inode;
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spin_unlock(&dcache_lock);
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security_d_instantiate(real_dent, dent_inode);
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ntfs_debug("Done. (Already had negative directory dentry.)");
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return real_dent;
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}
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/*
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* Directory with a 'disconnected' dentry; get a reference to the
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* 'disconnected' dentry.
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*/
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new_dent = list_entry(dent_inode->i_dentry.next, struct dentry,
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d_alias);
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dget_locked(new_dent);
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spin_unlock(&dcache_lock);
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/* Do security vodoo. */
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security_d_instantiate(real_dent, dent_inode);
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/* Move new_dent in place of real_dent. */
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d_move(new_dent, real_dent);
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/* Balance the ntfs_iget() we did above. */
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iput(dent_inode);
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/* Throw away real_dent. */
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dput(real_dent);
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/* Use new_dent as the actual dentry. */
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ntfs_debug("Done. (Already had negative, disconnected directory "
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"dentry.)");
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return new_dent;
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eio_err_out:
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ntfs_error(vol->sb, "Illegal file name attribute. Run chkdsk.");
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err = -EIO;
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err_out:
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if (ctx)
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ntfs_attr_put_search_ctx(ctx);
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if (m)
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unmap_mft_record(ni);
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iput(dent_inode);
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ntfs_error(vol->sb, "Failed, returning error code %i.", err);
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return ERR_PTR(err);
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}
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}
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/**
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* Inode operations for directories.
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*/
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struct inode_operations ntfs_dir_inode_ops = {
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.lookup = ntfs_lookup, /* VFS: Lookup directory. */
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};
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/**
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* ntfs_get_parent - find the dentry of the parent of a given directory dentry
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* @child_dent: dentry of the directory whose parent directory to find
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*
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* Find the dentry for the parent directory of the directory specified by the
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* dentry @child_dent. This function is called from
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* fs/exportfs/expfs.c::find_exported_dentry() which in turn is called from the
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* default ->decode_fh() which is export_decode_fh() in the same file.
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*
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* The code is based on the ext3 ->get_parent() implementation found in
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* fs/ext3/namei.c::ext3_get_parent().
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|
*
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* Note: ntfs_get_parent() is called with @child_dent->d_inode->i_sem down.
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*
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* Return the dentry of the parent directory on success or the error code on
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|
* error (IS_ERR() is true).
|
||
|
*/
|
||
|
struct dentry *ntfs_get_parent(struct dentry *child_dent)
|
||
|
{
|
||
|
struct inode *vi = child_dent->d_inode;
|
||
|
ntfs_inode *ni = NTFS_I(vi);
|
||
|
MFT_RECORD *mrec;
|
||
|
ntfs_attr_search_ctx *ctx;
|
||
|
ATTR_RECORD *attr;
|
||
|
FILE_NAME_ATTR *fn;
|
||
|
struct inode *parent_vi;
|
||
|
struct dentry *parent_dent;
|
||
|
unsigned long parent_ino;
|
||
|
int err;
|
||
|
|
||
|
ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
|
||
|
/* Get the mft record of the inode belonging to the child dentry. */
|
||
|
mrec = map_mft_record(ni);
|
||
|
if (IS_ERR(mrec))
|
||
|
return (struct dentry *)mrec;
|
||
|
/* Find the first file name attribute in the mft record. */
|
||
|
ctx = ntfs_attr_get_search_ctx(ni, mrec);
|
||
|
if (unlikely(!ctx)) {
|
||
|
unmap_mft_record(ni);
|
||
|
return ERR_PTR(-ENOMEM);
|
||
|
}
|
||
|
try_next:
|
||
|
err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, CASE_SENSITIVE, 0, NULL,
|
||
|
0, ctx);
|
||
|
if (unlikely(err)) {
|
||
|
ntfs_attr_put_search_ctx(ctx);
|
||
|
unmap_mft_record(ni);
|
||
|
if (err == -ENOENT)
|
||
|
ntfs_error(vi->i_sb, "Inode 0x%lx does not have a "
|
||
|
"file name attribute. Run chkdsk.",
|
||
|
vi->i_ino);
|
||
|
return ERR_PTR(err);
|
||
|
}
|
||
|
attr = ctx->attr;
|
||
|
if (unlikely(attr->non_resident))
|
||
|
goto try_next;
|
||
|
fn = (FILE_NAME_ATTR *)((u8 *)attr +
|
||
|
le16_to_cpu(attr->data.resident.value_offset));
|
||
|
if (unlikely((u8 *)fn + le32_to_cpu(attr->data.resident.value_length) >
|
||
|
(u8*)attr + le32_to_cpu(attr->length)))
|
||
|
goto try_next;
|
||
|
/* Get the inode number of the parent directory. */
|
||
|
parent_ino = MREF_LE(fn->parent_directory);
|
||
|
/* Release the search context and the mft record of the child. */
|
||
|
ntfs_attr_put_search_ctx(ctx);
|
||
|
unmap_mft_record(ni);
|
||
|
/* Get the inode of the parent directory. */
|
||
|
parent_vi = ntfs_iget(vi->i_sb, parent_ino);
|
||
|
if (IS_ERR(parent_vi) || unlikely(is_bad_inode(parent_vi))) {
|
||
|
if (!IS_ERR(parent_vi))
|
||
|
iput(parent_vi);
|
||
|
ntfs_error(vi->i_sb, "Failed to get parent directory inode "
|
||
|
"0x%lx of child inode 0x%lx.", parent_ino,
|
||
|
vi->i_ino);
|
||
|
return ERR_PTR(-EACCES);
|
||
|
}
|
||
|
/* Finally get a dentry for the parent directory and return it. */
|
||
|
parent_dent = d_alloc_anon(parent_vi);
|
||
|
if (unlikely(!parent_dent)) {
|
||
|
iput(parent_vi);
|
||
|
return ERR_PTR(-ENOMEM);
|
||
|
}
|
||
|
ntfs_debug("Done for inode 0x%lx.", vi->i_ino);
|
||
|
return parent_dent;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* ntfs_get_dentry - find a dentry for the inode from a file handle sub-fragment
|
||
|
* @sb: super block identifying the mounted ntfs volume
|
||
|
* @fh: the file handle sub-fragment
|
||
|
*
|
||
|
* Find a dentry for the inode given a file handle sub-fragment. This function
|
||
|
* is called from fs/exportfs/expfs.c::find_exported_dentry() which in turn is
|
||
|
* called from the default ->decode_fh() which is export_decode_fh() in the
|
||
|
* same file. The code is closely based on the default ->get_dentry() helper
|
||
|
* fs/exportfs/expfs.c::get_object().
|
||
|
*
|
||
|
* The @fh contains two 32-bit unsigned values, the first one is the inode
|
||
|
* number and the second one is the inode generation.
|
||
|
*
|
||
|
* Return the dentry on success or the error code on error (IS_ERR() is true).
|
||
|
*/
|
||
|
struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
|
||
|
{
|
||
|
struct inode *vi;
|
||
|
struct dentry *dent;
|
||
|
unsigned long ino = ((u32 *)fh)[0];
|
||
|
u32 gen = ((u32 *)fh)[1];
|
||
|
|
||
|
ntfs_debug("Entering for inode 0x%lx, generation 0x%x.", ino, gen);
|
||
|
vi = ntfs_iget(sb, ino);
|
||
|
if (IS_ERR(vi)) {
|
||
|
ntfs_error(sb, "Failed to get inode 0x%lx.", ino);
|
||
|
return (struct dentry *)vi;
|
||
|
}
|
||
|
if (unlikely(is_bad_inode(vi) || vi->i_generation != gen)) {
|
||
|
/* We didn't find the right inode. */
|
||
|
ntfs_error(sb, "Inode 0x%lx, bad count: %d %d or version 0x%x "
|
||
|
"0x%x.", vi->i_ino, vi->i_nlink,
|
||
|
atomic_read(&vi->i_count), vi->i_generation,
|
||
|
gen);
|
||
|
iput(vi);
|
||
|
return ERR_PTR(-ESTALE);
|
||
|
}
|
||
|
/* Now find a dentry. If possible, get a well-connected one. */
|
||
|
dent = d_alloc_anon(vi);
|
||
|
if (unlikely(!dent)) {
|
||
|
iput(vi);
|
||
|
return ERR_PTR(-ENOMEM);
|
||
|
}
|
||
|
ntfs_debug("Done for inode 0x%lx, generation 0x%x.", ino, gen);
|
||
|
return dent;
|
||
|
}
|