Merging upstream version 6.9.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 392 deletions

diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
deleted file mode 100644
index d7498ddc4a..0000000000
--- a/fs/ntfs/namei.c
+++ /dev/null
@@ -1,392 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * namei.c - NTFS kernel directory inode operations. Part of the Linux-NTFS
- *	     project.
- *
- * Copyright (c) 2001-2006 Anton Altaparmakov
- */
-
-#include <linux/dcache.h>
-#include <linux/exportfs.h>
-#include <linux/security.h>
-#include <linux/slab.h>
-
-#include "attrib.h"
-#include "debug.h"
-#include "dir.h"
-#include "mft.h"
-#include "ntfs.h"
-
-/**
- * ntfs_lookup - find the inode represented by a dentry in a directory inode
- * @dir_ino:	directory inode in which to look for the inode
- * @dent:	dentry representing the inode to look for
- * @flags:	lookup flags
- *
- * In short, ntfs_lookup() looks for the inode represented by the dentry @dent
- * in the directory inode @dir_ino and if found attaches the inode to the
- * dentry @dent.
- *
- * In more detail, the dentry @dent specifies which inode to look for by
- * supplying the name of the inode in @dent->d_name.name. ntfs_lookup()
- * converts the name to Unicode and walks the contents of the directory inode
- * @dir_ino looking for the converted Unicode name. If the name is found in the
- * directory, the corresponding inode is loaded by calling ntfs_iget() on its
- * inode number and the inode is associated with the dentry @dent via a call to
- * d_splice_alias().
- *
- * If the name is not found in the directory, a NULL inode is inserted into the
- * dentry @dent via a call to d_add(). The dentry is then termed a negative
- * dentry.
- *
- * Only if an actual error occurs, do we return an error via ERR_PTR().
- *
- * In order to handle the case insensitivity issues of NTFS with regards to the
- * dcache and the dcache requiring only one dentry per directory, we deal with
- * dentry aliases that only differ in case in ->ntfs_lookup() while maintaining
- * a case sensitive dcache. This means that we get the full benefit of dcache
- * speed when the file/directory is looked up with the same case as returned by
- * ->ntfs_readdir() but that a lookup for any other case (or for the short file
- * name) will not find anything in dcache and will enter ->ntfs_lookup()
- * instead, where we search the directory for a fully matching file name
- * (including case) and if that is not found, we search for a file name that
- * matches with different case and if that has non-POSIX semantics we return
- * that. We actually do only one search (case sensitive) and keep tabs on
- * whether we have found a case insensitive match in the process.
- *
- * To simplify matters for us, we do not treat the short vs long filenames as
- * two hard links but instead if the lookup matches a short filename, we
- * return the dentry for the corresponding long filename instead.
- *
- * There are three cases we need to distinguish here:
- *
- * 1) @dent perfectly matches (i.e. including case) a directory entry with a
- *    file name in the WIN32 or POSIX namespaces. In this case
- *    ntfs_lookup_inode_by_name() will return with name set to NULL and we
- *    just d_splice_alias() @dent.
- * 2) @dent matches (not including case) a directory entry with a file name in
- *    the WIN32 namespace. In this case ntfs_lookup_inode_by_name() will return
- *    with name set to point to a kmalloc()ed ntfs_name structure containing
- *    the properly cased little endian Unicode name. We convert the name to the
- *    current NLS code page, search if a dentry with this name already exists
- *    and if so return that instead of @dent.  At this point things are
- *    complicated by the possibility of 'disconnected' dentries due to NFS
- *    which we deal with appropriately (see the code comments).  The VFS will
- *    then destroy the old @dent and use the one we returned.  If a dentry is
- *    not found, we allocate a new one, d_splice_alias() it, and return it as
- *    above.
- * 3) @dent matches either perfectly or not (i.e. we don't care about case) a
- *    directory entry with a file name in the DOS namespace. In this case
- *    ntfs_lookup_inode_by_name() will return with name set to point to a
- *    kmalloc()ed ntfs_name structure containing the mft reference (cpu endian)
- *    of the inode. We use the mft reference to read the inode and to find the
- *    file name in the WIN32 namespace corresponding to the matched short file
- *    name. We then convert the name to the current NLS code page, and proceed
- *    searching for a dentry with this name, etc, as in case 2), above.
- *
- * Locking: Caller must hold i_mutex on the directory.
- */
-static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
-		unsigned int flags)
-{
-	ntfs_volume *vol = NTFS_SB(dir_ino->i_sb);
-	struct inode *dent_inode;
-	ntfschar *uname;
-	ntfs_name *name = NULL;
-	MFT_REF mref;
-	unsigned long dent_ino;
-	int uname_len;
-
-	ntfs_debug("Looking up %pd in directory inode 0x%lx.",
-			dent, dir_ino->i_ino);
-	/* Convert the name of the dentry to Unicode. */
-	uname_len = ntfs_nlstoucs(vol, dent->d_name.name, dent->d_name.len,
-			&uname);
-	if (uname_len < 0) {
-		if (uname_len != -ENAMETOOLONG)
-			ntfs_error(vol->sb, "Failed to convert name to "
-					"Unicode.");
-		return ERR_PTR(uname_len);
-	}
-	mref = ntfs_lookup_inode_by_name(NTFS_I(dir_ino), uname, uname_len,
-			&name);
-	kmem_cache_free(ntfs_name_cache, uname);
-	if (!IS_ERR_MREF(mref)) {
-		dent_ino = MREF(mref);
-		ntfs_debug("Found inode 0x%lx. Calling ntfs_iget.", dent_ino);
-		dent_inode = ntfs_iget(vol->sb, dent_ino);
-		if (!IS_ERR(dent_inode)) {
-			/* Consistency check. */
-			if (is_bad_inode(dent_inode) || MSEQNO(mref) ==
-					NTFS_I(dent_inode)->seq_no ||
-					dent_ino == FILE_MFT) {
-				/* Perfect WIN32/POSIX match. -- Case 1. */
-				if (!name) {
-					ntfs_debug("Done.  (Case 1.)");
-					return d_splice_alias(dent_inode, dent);
-				}
-				/*
-				 * We are too indented.  Handle imperfect
-				 * matches and short file names further below.
-				 */
-				goto handle_name;
-			}
-			ntfs_error(vol->sb, "Found stale reference to inode "
-					"0x%lx (reference sequence number = "
-					"0x%x, inode sequence number = 0x%x), "
-					"returning -EIO. Run chkdsk.",
-					dent_ino, MSEQNO(mref),
-					NTFS_I(dent_inode)->seq_no);
-			iput(dent_inode);
-			dent_inode = ERR_PTR(-EIO);
-		} else
-			ntfs_error(vol->sb, "ntfs_iget(0x%lx) failed with "
-					"error code %li.", dent_ino,
-					PTR_ERR(dent_inode));
-		kfree(name);
-		/* Return the error code. */
-		return ERR_CAST(dent_inode);
-	}
-	/* It is guaranteed that @name is no longer allocated at this point. */
-	if (MREF_ERR(mref) == -ENOENT) {
-		ntfs_debug("Entry was not found, adding negative dentry.");
-		/* The dcache will handle negative entries. */
-		d_add(dent, NULL);
-		ntfs_debug("Done.");
-		return NULL;
-	}
-	ntfs_error(vol->sb, "ntfs_lookup_ino_by_name() failed with error "
-			"code %i.", -MREF_ERR(mref));
-	return ERR_PTR(MREF_ERR(mref));
-	// TODO: Consider moving this lot to a separate function! (AIA)
-handle_name:
-   {
-	MFT_RECORD *m;
-	ntfs_attr_search_ctx *ctx;
-	ntfs_inode *ni = NTFS_I(dent_inode);
-	int err;
-	struct qstr nls_name;
-
-	nls_name.name = NULL;
-	if (name->type != FILE_NAME_DOS) {			/* Case 2. */
-		ntfs_debug("Case 2.");
-		nls_name.len = (unsigned)ntfs_ucstonls(vol,
-				(ntfschar*)&name->name, name->len,
-				(unsigned char**)&nls_name.name, 0);
-		kfree(name);
-	} else /* if (name->type == FILE_NAME_DOS) */ {		/* Case 3. */
-		FILE_NAME_ATTR *fn;
-
-		ntfs_debug("Case 3.");
-		kfree(name);
-
-		/* Find the WIN32 name corresponding to the matched DOS name. */
-		ni = NTFS_I(dent_inode);
-		m = map_mft_record(ni);
-		if (IS_ERR(m)) {
-			err = PTR_ERR(m);
-			m = NULL;
-			ctx = NULL;
-			goto err_out;
-		}
-		ctx = ntfs_attr_get_search_ctx(ni, m);
-		if (unlikely(!ctx)) {
-			err = -ENOMEM;
-			goto err_out;
-		}
-		do {
-			ATTR_RECORD *a;
-			u32 val_len;
-
-			err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0,
-					NULL, 0, ctx);
-			if (unlikely(err)) {
-				ntfs_error(vol->sb, "Inode corrupt: No WIN32 "
-						"namespace counterpart to DOS "
-						"file name. Run chkdsk.");
-				if (err == -ENOENT)
-					err = -EIO;
-				goto err_out;
-			}
-			/* Consistency checks. */
-			a = ctx->attr;
-			if (a->non_resident || a->flags)
-				goto eio_err_out;
-			val_len = le32_to_cpu(a->data.resident.value_length);
-			if (le16_to_cpu(a->data.resident.value_offset) +
-					val_len > le32_to_cpu(a->length))
-				goto eio_err_out;
-			fn = (FILE_NAME_ATTR*)((u8*)ctx->attr + le16_to_cpu(
-					ctx->attr->data.resident.value_offset));
-			if ((u32)(fn->file_name_length * sizeof(ntfschar) +
-					sizeof(FILE_NAME_ATTR)) > val_len)
-				goto eio_err_out;
-		} while (fn->file_name_type != FILE_NAME_WIN32);
-
-		/* Convert the found WIN32 name to current NLS code page. */
-		nls_name.len = (unsigned)ntfs_ucstonls(vol,
-				(ntfschar*)&fn->file_name, fn->file_name_length,
-				(unsigned char**)&nls_name.name, 0);
-
-		ntfs_attr_put_search_ctx(ctx);
-		unmap_mft_record(ni);
-	}
-	m = NULL;
-	ctx = NULL;
-
-	/* Check if a conversion error occurred. */
-	if ((signed)nls_name.len < 0) {
-		err = (signed)nls_name.len;
-		goto err_out;
-	}
-	nls_name.hash = full_name_hash(dent, nls_name.name, nls_name.len);
-
-	dent = d_add_ci(dent, dent_inode, &nls_name);
-	kfree(nls_name.name);
-	return dent;
-
-eio_err_out:
-	ntfs_error(vol->sb, "Illegal file name attribute. Run chkdsk.");
-	err = -EIO;
-err_out:
-	if (ctx)
-		ntfs_attr_put_search_ctx(ctx);
-	if (m)
-		unmap_mft_record(ni);
-	iput(dent_inode);
-	ntfs_error(vol->sb, "Failed, returning error code %i.", err);
-	return ERR_PTR(err);
-   }
-}
-
-/*
- * Inode operations for directories.
- */
-const struct inode_operations ntfs_dir_inode_ops = {
-	.lookup	= ntfs_lookup,	/* VFS: Lookup directory. */
-};
-
-/**
- * ntfs_get_parent - find the dentry of the parent of a given directory dentry
- * @child_dent:		dentry of the directory whose parent directory to find
- *
- * Find the dentry for the parent directory of the directory specified by the
- * dentry @child_dent.  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 based on the ext3 ->get_parent() implementation found in
- * fs/ext3/namei.c::ext3_get_parent().
- *
- * Note: ntfs_get_parent() is called with @d_inode(child_dent)->i_mutex down.
- *
- * Return the dentry of the parent directory on success or the error code on
- * error (IS_ERR() is true).
- */
-static struct dentry *ntfs_get_parent(struct dentry *child_dent)
-{
-	struct inode *vi = d_inode(child_dent);
-	ntfs_inode *ni = NTFS_I(vi);
-	MFT_RECORD *mrec;
-	ntfs_attr_search_ctx *ctx;
-	ATTR_RECORD *attr;
-	FILE_NAME_ATTR *fn;
-	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 ERR_CAST(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);
-
-	return d_obtain_alias(ntfs_iget(vi->i_sb, parent_ino));
-}
-
-static struct inode *ntfs_nfs_get_inode(struct super_block *sb,
-		u64 ino, u32 generation)
-{
-	struct inode *inode;
-
-	inode = ntfs_iget(sb, ino);
-	if (!IS_ERR(inode)) {
-		if (is_bad_inode(inode) || inode->i_generation != generation) {
-			iput(inode);
-			inode = ERR_PTR(-ESTALE);
-		}
-	}
-
-	return inode;
-}
-
-static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
-		int fh_len, int fh_type)
-{
-	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
-				    ntfs_nfs_get_inode);
-}
-
-static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
-		int fh_len, int fh_type)
-{
-	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
-				    ntfs_nfs_get_inode);
-}
-
-/*
- * Export operations allowing NFS exporting of mounted NTFS partitions.
- *
- * We use the default ->encode_fh() for now.  Note that they
- * use 32 bits to store the inode number which is an unsigned long so on 64-bit
- * architectures is usually 64 bits so it would all fail horribly on huge
- * volumes.  I guess we need to define our own encode and decode fh functions
- * that store 64-bit inode numbers at some point but for now we will ignore the
- * problem...
- *
- * We also use the default ->get_name() helper (used by ->decode_fh() via
- * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs
- * independent.
- *
- * The default ->get_parent() just returns -EACCES so we have to provide our
- * own and the default ->get_dentry() is incompatible with NTFS due to not
- * allowing the inode number 0 which is used in NTFS for the system file $MFT
- * and due to using iget() whereas NTFS needs ntfs_iget().
- */
-const struct export_operations ntfs_export_ops = {
-	.encode_fh	= generic_encode_ino32_fh,
-	.get_parent	= ntfs_get_parent,	/* Find the parent of a given
-						   directory. */
-	.fh_to_dentry	= ntfs_fh_to_dentry,
-	.fh_to_parent	= ntfs_fh_to_parent,
-};