*/
#include <linux/dcache.h>
+#include <linux/exportfs.h>
#include <linux/security.h>
#include "attrib.h"
// TODO: Consider moving this lot to a separate function! (AIA)
handle_name:
{
- struct dentry *real_dent, *new_dent;
MFT_RECORD *m;
ntfs_attr_search_ctx *ctx;
ntfs_inode *ni = NTFS_I(dent_inode);
}
nls_name.hash = full_name_hash(nls_name.name, nls_name.len);
- /*
- * Note: No need for dent->d_lock lock as i_mutex is held on the
- * parent inode.
- */
-
- /* Does a dentry matching the nls_name exist already? */
- real_dent = d_lookup(dent->d_parent, &nls_name);
- /* If not, create it now. */
- if (!real_dent) {
- real_dent = d_alloc(dent->d_parent, &nls_name);
- kfree(nls_name.name);
- if (!real_dent) {
- err = -ENOMEM;
- goto err_out;
- }
- new_dent = d_splice_alias(dent_inode, real_dent);
- if (new_dent)
- dput(real_dent);
- else
- new_dent = real_dent;
- ntfs_debug("Done. (Created new dentry.)");
- return new_dent;
- }
+ dent = d_add_ci(dent, dent_inode, &nls_name);
kfree(nls_name.name);
- /* Matching dentry exists, check if it is negative. */
- if (real_dent->d_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
- * earlier on. We found the dentry using d_lookup() so it
- * cannot be disconnected and thus we do not need to worry
- * about any NFS/disconnectedness issues here.
- */
- iput(dent_inode);
- ntfs_debug("Done. (Already had inode and dentry.)");
- return real_dent;
- }
- /*
- * Negative dentry: instantiate it unless the inode is a directory and
- * has a 'disconnected' dentry (i.e. IS_ROOT and DCACHE_DISCONNECTED),
- * in which case d_move() that in place of the found dentry.
- */
- 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);
- if (list_empty(&dent_inode->i_dentry)) {
- /*
- * Directory without a 'disconnected' dentry; we need to do
- * d_instantiate() by hand because it takes dcache_lock which
- * we already hold.
- */
- list_add(&real_dent->d_alias, &dent_inode->i_dentry);
- 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;
- }
- /*
- * Directory with a 'disconnected' dentry; get a reference to the
- * 'disconnected' dentry.
- */
- new_dent = list_entry(dent_inode->i_dentry.next, struct dentry,
- d_alias);
- dget_locked(new_dent);
- spin_unlock(&dcache_lock);
- /* Do security vodoo. */
- security_d_instantiate(real_dent, dent_inode);
- /* Move new_dent in place of real_dent. */
- d_move(new_dent, real_dent);
- /* Balance the ntfs_iget() we did above. */
- iput(dent_inode);
- /* 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;
+ return dent;
eio_err_out:
ntfs_error(vol->sb, "Illegal file name attribute. Run chkdsk.");
/**
* Inode operations for directories.
*/
-struct inode_operations ntfs_dir_inode_ops = {
+const struct inode_operations ntfs_dir_inode_ops = {
.lookup = ntfs_lookup, /* VFS: Lookup directory. */
};
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;
/* 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;
+
+ return d_obtain_alias(ntfs_iget(vi->i_sb, parent_ino));
}
-/**
- * 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).
- */
-static struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
+static struct inode *ntfs_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
{
- struct inode *vi;
- struct dentry *dent;
- unsigned long ino = ((u32 *)fh)[0];
- u32 gen = ((u32 *)fh)[1];
+ struct inode *inode;
- 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);
+ inode = ntfs_iget(sb, ino);
+ if (!IS_ERR(inode)) {
+ if (is_bad_inode(inode) || inode->i_generation != generation) {
+ iput(inode);
+ inode = ERR_PTR(-ESTALE);
+ }
}
- ntfs_debug("Done for inode 0x%lx, generation 0x%x.", ino, gen);
- return dent;
+
+ 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 ->decode_fh() and ->encode_fh() for now. Note that they
+ * 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
* 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 = {
+const 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. */
+ .fh_to_dentry = ntfs_fh_to_dentry,
+ .fh_to_parent = ntfs_fh_to_parent,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff