* namei.c - NTFS kernel directory inode operations. Part of the Linux-NTFS
* project.
*
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2006 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
#include <linux/dcache.h>
#include <linux/security.h>
-#include "ntfs.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
* 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,
struct nameidata *nd)
uname_len = ntfs_nlstoucs(vol, dent->d_name.name, dent->d_name.len,
&uname);
if (uname_len < 0) {
- ntfs_error(vol->sb, "Failed to convert name to Unicode.");
+ 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,
dent_inode = ntfs_iget(vol->sb, dent_ino);
if (likely(!IS_ERR(dent_inode))) {
/* Consistency check. */
- if (MSEQNO(mref) == NTFS_I(dent_inode)->seq_no ||
+ 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.");
+ ntfs_debug("Done. (Case 1.)");
return d_splice_alias(dent_inode, dent);
}
/*
- * We are too indented. Handle imperfect
+ * We are too indented. Handle imperfect
* matches and short file names further below.
*/
goto handle_name;
ntfs_error(vol->sb, "ntfs_iget(0x%lx) failed with "
"error code %li.", dent_ino,
PTR_ERR(dent_inode));
- if (name)
- kfree(name);
+ kfree(name);
/* Return the error code. */
return (struct dentry *)dent_inode;
}
- /* It is guaranteed that name is no longer allocated at this point. */
+ /* 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. */
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:
{
struct dentry *real_dent, *new_dent;
MFT_RECORD *m;
- attr_search_context *ctx;
+ 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);
} 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. */
ctx = NULL;
goto err_out;
}
- ctx = get_attr_search_ctx(ni, m);
- if (!ctx) {
+ ctx = ntfs_attr_get_search_ctx(ni, m);
+ if (unlikely(!ctx)) {
err = -ENOMEM;
goto err_out;
}
ATTR_RECORD *a;
u32 val_len;
- if (!lookup_attr(AT_FILE_NAME, NULL, 0, 0, 0, NULL, 0,
- ctx)) {
+ 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.");
- err = -EIO;
+ if (err == -ENOENT)
+ err = -EIO;
goto err_out;
}
/* Consistency checks. */
(ntfschar*)&fn->file_name, fn->file_name_length,
(unsigned char**)&nls_name.name, 0);
- put_attr_search_ctx(ctx);
+ ntfs_attr_put_search_ctx(ctx);
unmap_mft_record(ni);
}
m = NULL;
nls_name.hash = full_name_hash(nls_name.name, nls_name.len);
/*
- * Note: No need for dent->d_lock lock as i_sem is held on the
+ * Note: No need for dent->d_lock lock as i_mutex is held on the
* parent inode.
*/
dput(real_dent);
else
new_dent = real_dent;
+ ntfs_debug("Done. (Created new dentry.)");
return new_dent;
}
kfree(nls_name.name);
/* Matching dentry exists, check if it is negative. */
if (real_dent->d_inode) {
- BUG_ON(real_dent->d_inode != dent_inode);
+ if (unlikely(real_dent->d_inode != dent_inode)) {
+ /* This can happen because bad inodes are unhashed. */
+ BUG_ON(!is_bad_inode(dent_inode));
+ BUG_ON(!is_bad_inode(real_dent->d_inode));
+ }
/*
* Already have the inode and the dentry attached, decrement
* the reference count to balance the ntfs_iget() we did
* about any NFS/disconnectedness issues here.
*/
iput(dent_inode);
+ ntfs_debug("Done. (Already had inode and dentry.)");
return real_dent;
}
/*
if (!S_ISDIR(dent_inode->i_mode)) {
/* Not a directory; everything is easy. */
d_instantiate(real_dent, dent_inode);
+ ntfs_debug("Done. (Already had negative file dentry.)");
return real_dent;
}
spin_lock(&dcache_lock);
real_dent->d_inode = dent_inode;
spin_unlock(&dcache_lock);
security_d_instantiate(real_dent, dent_inode);
+ ntfs_debug("Done. (Already had negative directory dentry.)");
return real_dent;
}
/*
/* Throw away real_dent. */
dput(real_dent);
/* Use new_dent as the actual dentry. */
+ ntfs_debug("Done. (Already had negative, disconnected directory "
+ "dentry.)");
return new_dent;
eio_err_out:
err = -EIO;
err_out:
if (ctx)
- put_attr_search_ctx(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);
}
}
* 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 @child_dent->d_inode->i_sem down.
+ * Note: ntfs_get_parent() is called with @child_dent->d_inode->i_mutex down.
*
* Return the dentry of the parent directory on success or the error code on
* error (IS_ERR() is true).
*/
-struct dentry *ntfs_get_parent(struct dentry *child_dent)
+static 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;
- attr_search_context *ctx;
+ 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 (unlikely(IS_ERR(mrec)))
+ if (IS_ERR(mrec))
return (struct dentry *)mrec;
/* Find the first file name attribute in the mft record. */
- ctx = get_attr_search_ctx(ni, mrec);
+ ctx = ntfs_attr_get_search_ctx(ni, mrec);
if (unlikely(!ctx)) {
unmap_mft_record(ni);
return ERR_PTR(-ENOMEM);
}
try_next:
- if (unlikely(!lookup_attr(AT_FILE_NAME, NULL, 0, IGNORE_CASE, 0,
- NULL, 0, ctx))) {
- put_attr_search_ctx(ctx);
+ 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);
- ntfs_error(vi->i_sb, "Inode 0x%lx does not have a file name "
- "attribute. Run chkdsk.", vi->i_ino);
- return ERR_PTR(-ENOENT);
+ 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))
/* 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. */
- put_attr_search_ctx(ctx);
+ 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 (unlikely(IS_ERR(parent_vi) || is_bad_inode(parent_vi))) {
+ 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 "
*
* 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)
+static struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
{
struct inode *vi;
struct dentry *dent;
ntfs_debug("Entering for inode 0x%lx, generation 0x%x.", ino, gen);
vi = ntfs_iget(sb, ino);
- if (unlikely(IS_ERR(vi))) {
+ if (IS_ERR(vi)) {
ntfs_error(sb, "Failed to get inode 0x%lx.", ino);
return (struct dentry *)vi;
}
ntfs_debug("Done for inode 0x%lx, generation 0x%x.", ino, gen);
return dent;
}
+
+/**
+ * Export operations allowing NFS exporting of mounted NTFS partitions.
+ *
+ * We use the default ->decode_fh() and ->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().
+ */
+struct export_operations ntfs_export_ops = {
+ .get_parent = ntfs_get_parent, /* Find the parent of a given
+ directory. */
+ .get_dentry = ntfs_get_dentry, /* Find a dentry for the inode
+ given a file handle
+ sub-fragment. */
+};
git://git.onelab.eu / linux-2.6.git / blobdiff