[PATCH] switch all filesystems over to d_obtain_alias

Switch all users of d_alloc_anon to d_obtain_alias.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

19 files changed, 78 insertions, 305 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index 46fc78206782..d45ff7f5ecc2 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1187,17 +1187,17 @@ struct dentry * d_alloc_anon(struct inode *inode)
  * allocating a new one.
  *
  * On successful return, the reference to the inode has been transferred
- * to the dentry.  If %NULL is returned (indicating kmalloc failure),
- * the reference on the inode has been released.  To make it easier
- * to use in export operations a NULL or IS_ERR inode may be passed in
- * and will be casted to the corresponding NULL or IS_ERR dentry.
+ * to the dentry.  In case of an error the reference on the inode is released.
+ * To make it easier to use in export operations a %NULL or IS_ERR inode may
+ * be passed in and will be the error will be propagate to the return value,
+ * with a %NULL @inode replaced by ERR_PTR(-ESTALE).
  */
 struct dentry *d_obtain_alias(struct inode *inode)
 {
         struct dentry *dentry;
 
         if (!inode)
-                return NULL;
+                return ERR_PTR(-ESTALE);
         if (IS_ERR(inode))
                 return ERR_CAST(inode);
 
diff --git a/fs/efs/namei.c b/fs/efs/namei.c
index 291abb11e20e..c3fb5f9c4a44 100644
--- a/fs/efs/namei.c
+++ b/fs/efs/namei.c
@@ -112,35 +112,14 @@ struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
 
 struct dentry *efs_get_parent(struct dentry *child)
 {
-        struct dentry *parent;
-        struct inode *inode;
+        struct dentry *parent = ERR_PTR(-ENOENT);
         efs_ino_t ino;
-        long error;
 
         lock_kernel();
-
-        error = -ENOENT;
         ino = efs_find_entry(child->d_inode, "..", 2);
-        if (!ino)
-                goto fail;
-
-        inode = efs_iget(child->d_inode->i_sb, ino);
-        if (IS_ERR(inode)) {
-                error = PTR_ERR(inode);
-                goto fail;
-        }
-
-        error = -ENOMEM;
-        parent = d_alloc_anon(inode);
-        if (!parent)
-                goto fail_iput;
-
+        if (ino)
+                parent = d_obtain_alias(efs_iget(child->d_inode->i_sb, ino));
         unlock_kernel();
-        return parent;
 
- fail_iput:
-        iput(inode);
- fail:
-        unlock_kernel();
-        return ERR_PTR(error);
+        return parent;
 }
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index cc91227d3bb8..7b0f75dcf800 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -366,8 +366,6 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
          * Try to get any dentry for the given file handle from the filesystem.
          */
         result = nop->fh_to_dentry(mnt->mnt_sb, fid, fh_len, fileid_type);
-        if (!result)
-                result = ERR_PTR(-ESTALE);
         if (IS_ERR(result))
                 return result;
 
@@ -422,8 +420,6 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
 
                 target_dir = nop->fh_to_parent(mnt->mnt_sb, fid,
                                 fh_len, fileid_type);
-                if (!target_dir)
-                        goto err_result;
                 err = PTR_ERR(target_dir);
                 if (IS_ERR(target_dir))
                         goto err_result;
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 80c97fd8c571..a1b328ab1e55 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -73,8 +73,6 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, str
 struct dentry *ext2_get_parent(struct dentry *child)
 {
         unsigned long ino;
-        struct dentry *parent;
-        struct inode *inode;
         struct dentry dotdot;
 
         dotdot.d_name.name = "..";
@@ -83,16 +81,7 @@ struct dentry *ext2_get_parent(struct dentry *child)
         ino = ext2_inode_by_name(child->d_inode, &dotdot);
         if (!ino)
                 return ERR_PTR(-ENOENT);
-        inode = ext2_iget(child->d_inode->i_sb, ino);
-
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
-        return parent;
+        return d_obtain_alias(ext2_iget(child->d_inode->i_sb, ino));
 } 
 
 /*
diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index de13e919cd81..880b54400ac0 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -1057,8 +1057,6 @@ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, str
 struct dentry *ext3_get_parent(struct dentry *child)
 {
         unsigned long ino;
-        struct dentry *parent;
-        struct inode *inode;
         struct dentry dotdot;
         struct ext3_dir_entry_2 * de;
         struct buffer_head *bh;
@@ -1068,7 +1066,6 @@ struct dentry *ext3_get_parent(struct dentry *child)
         dotdot.d_parent = child; /* confusing, isn't it! */
 
         bh = ext3_find_entry(&dotdot, &de);
-        inode = NULL;
         if (!bh)
                 return ERR_PTR(-ENOENT);
         ino = le32_to_cpu(de->inode);
@@ -1080,16 +1077,7 @@ struct dentry *ext3_get_parent(struct dentry *child)
                 return ERR_PTR(-EIO);
         }
 
-        inode = ext3_iget(child->d_inode->i_sb, ino);
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
-        return parent;
+        return d_obtain_alias(ext3_iget(child->d_inode->i_sb, ino));
 }
 
 #define S_SHIFT 12
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 92db9e945147..5b93a7d94d42 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1083,16 +1083,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
                 return ERR_PTR(-EIO);
         }
 
-        inode = ext4_iget(child->d_inode->i_sb, ino);
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
-        return parent;
+        return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino));
 }
 
 #define S_SHIFT 12
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index d12cdf2a0406..19eafbe3c379 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -681,33 +681,24 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
                         inode = NULL;
                 }
         }
-        if (!inode) {
-                /* For now, do nothing
-                 * What we could do is:
-                 * follow the file starting at fh[4], and record
-                 * the ".." entry, and the name of the fh[2] entry.
-                 * The follow the ".." file finding the next step up.
-                 * This way we build a path to the root of
-                 * the tree. If this works, we lookup the path and so
-                 * get this inode into the cache.
-                 * Finally try the fat_iget lookup again
-                 * If that fails, then weare totally out of luck
-                 * But all that is for another day
-                 */
-        }
-        if (!inode)
-                return ERR_PTR(-ESTALE);
-
 
-        /* now to find a dentry.
-         * If possible, get a well-connected one
+        /*
+         * For now, do nothing if the inode is not found.
+         *
+         * What we could do is:
+         *
+         *      - follow the file starting at fh[4], and record the ".." entry,
+         *        and the name of the fh[2] entry.
+         *      - then follow the ".." file finding the next step up.
+         *
+         * This way we build a path to the root of the tree. If this works, we
+         * lookup the path and so get this inode into the cache.  Finally try
+         * the fat_iget lookup again.  If that fails, then we are totally out
+         * of luck.  But all that is for another day
          */
-        result = d_alloc_anon(inode);
-        if (result == NULL) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-        result->d_op = sb->s_root->d_op;
+        result = d_obtain_alias(inode);
+        if (!IS_ERR(result))
+                result->d_op = sb->s_root->d_op;
         return result;
 }
 
@@ -754,15 +745,8 @@ static struct dentry *fat_get_parent(struct dentry *child)
         }
         inode = fat_build_inode(sb, de, i_pos);
         brelse(bh);
-        if (IS_ERR(inode)) {
-                parent = ERR_CAST(inode);
-                goto out;
-        }
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
+
+        parent = d_obtain_alias(inode);
 out:
         unlock_super(sb);
 
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 54b1f0e1ef58..2e99f34b4435 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -596,12 +596,8 @@ static struct dentry *fuse_get_dentry(struct super_block *sb,
         if (inode->i_generation != handle->generation)
                 goto out_iput;
 
-        entry = d_alloc_anon(inode);
-        err = -ENOMEM;
-        if (!entry)
-                goto out_iput;
-
-        if (get_node_id(inode) != FUSE_ROOT_ID) {
+        entry = d_obtain_alias(inode);
+        if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID) {
                 entry->d_op = &fuse_dentry_operations;
                 fuse_invalidate_entry_cache(entry);
         }
@@ -696,17 +692,14 @@ static struct dentry *fuse_get_parent(struct dentry *child)
         name.name = "..";
         err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
                                &name, &outarg, &inode);
-        if (err && err != -ENOENT)
+        if (err) {
+                if (err == -ENOENT)
+                        return ERR_PTR(-ESTALE);
                 return ERR_PTR(err);
-        if (err || !inode)
-                return ERR_PTR(-ESTALE);
-
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
         }
-        if (get_node_id(inode) != FUSE_ROOT_ID) {
+
+        parent = d_obtain_alias(inode);
+        if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID) {
                 parent->d_op = &fuse_dentry_operations;
                 fuse_invalidate_entry_cache(parent);
         }
diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
index 9cda8536530c..bbb8c36403a9 100644
--- a/fs/gfs2/ops_export.c
+++ b/fs/gfs2/ops_export.c
@@ -130,28 +130,17 @@ static int gfs2_get_name(struct dentry *parent, char *name,
 static struct dentry *gfs2_get_parent(struct dentry *child)
 {
         struct qstr dotdot;
-        struct inode *inode;
         struct dentry *dentry;
 
-        gfs2_str2qstr(&dotdot, "..");
-        inode = gfs2_lookupi(child->d_inode, &dotdot, 1);
-
-        if (!inode)
-                return ERR_PTR(-ENOENT);
         /*
-         * In case of an error, @inode carries the error value, and we
-         * have to return that as a(n invalid) pointer to dentry.
+         * XXX(hch): it would be a good idea to keep this around as a
+         *           static variable.
          */
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-
-        dentry = d_alloc_anon(inode);
-        if (!dentry) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
+        gfs2_str2qstr(&dotdot, "..");
 
-        dentry->d_op = &gfs2_dops;
+        dentry = d_obtain_alias(gfs2_lookupi(child->d_inode, &dotdot, 1));
+        if (!IS_ERR(dentry))
+                dentry->d_op = &gfs2_dops;
         return dentry;
 }
 
@@ -233,13 +222,9 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb,
         gfs2_glock_dq_uninit(&i_gh);
 
 out_inode:
-        dentry = d_alloc_anon(inode);
-        if (!dentry) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-
-        dentry->d_op = &gfs2_dops;
+        dentry = d_obtain_alias(inode);
+        if (!IS_ERR(dentry))
+                dentry->d_op = &gfs2_dops;
         return dentry;
 
 fail_rgd:
diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index bb219138331a..e81a30593ba9 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -22,7 +22,7 @@ isofs_export_iget(struct super_block *sb,
                   __u32 generation)
 {
         struct inode *inode;
-        struct dentry *result;
+
         if (block == 0)
                 return ERR_PTR(-ESTALE);
         inode = isofs_iget(sb, block, offset);
@@ -32,12 +32,7 @@ isofs_export_iget(struct super_block *sb,
                 iput(inode);
                 return ERR_PTR(-ESTALE);
         }
-        result = d_alloc_anon(inode);
-        if (!result) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-        return result;
+        return d_obtain_alias(inode);
 }
 
 /* This function is surprisingly simple.  The trick is understanding
@@ -51,7 +46,6 @@ static struct dentry *isofs_export_get_parent(struct dentry *child)
         unsigned long parent_offset = 0;
         struct inode *child_inode = child->d_inode;
         struct iso_inode_info *e_child_inode = ISOFS_I(child_inode);
-        struct inode *parent_inode = NULL;
         struct iso_directory_record *de = NULL;
         struct buffer_head * bh = NULL;
         struct dentry *rv = NULL;
@@ -104,28 +98,11 @@ static struct dentry *isofs_export_get_parent(struct dentry *child)
         /* Normalize */
         isofs_normalize_block_and_offset(de, &parent_block, &parent_offset);
 
-        /* Get the inode. */
-        parent_inode = isofs_iget(child_inode->i_sb,
-                                  parent_block,
-                                  parent_offset);
-        if (IS_ERR(parent_inode)) {
-                rv = ERR_CAST(parent_inode);
-                if (rv != ERR_PTR(-ENOMEM))
-                        rv = ERR_PTR(-EACCES);
-                goto out;
-        }
-
-        /* Allocate the dentry. */
-        rv = d_alloc_anon(parent_inode);
-        if (rv == NULL) {
-                rv = ERR_PTR(-ENOMEM);
-                goto out;
-        }
-
+        rv = d_obtain_alias(isofs_iget(child_inode->i_sb, parent_block,
+                                     parent_offset));
  out:
-        if (bh) {
+        if (bh)
                 brelse(bh);
-        }
         return rv;
 }
 
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 2aba82386810..e199dde7b83c 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1511,25 +1511,12 @@ struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
 
 struct dentry *jfs_get_parent(struct dentry *dentry)
 {
-        struct super_block *sb = dentry->d_inode->i_sb;
-        struct dentry *parent = ERR_PTR(-ENOENT);
-        struct inode *inode;
         unsigned long parent_ino;
 
         parent_ino =
                 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
-        inode = jfs_iget(sb, parent_ino);
-        if (IS_ERR(inode)) {
-                parent = ERR_CAST(inode);
-        } else {
-                parent = d_alloc_anon(inode);
-                if (!parent) {
-                        parent = ERR_PTR(-ENOMEM);
-                        iput(inode);
-                }
-        }
 
-        return parent;
+        return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino));
 }
 
 const struct inode_operations jfs_dir_inode_operations = {
diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index fae97196daad..b7c9b2df1f29 100644
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -107,11 +107,10 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh)
          * if the dentry tree reaches them; however if the dentry already
          * exists, we'll pick it up at this point and use it as the root
          */
-        mntroot = d_alloc_anon(inode);
-        if (!mntroot) {
-                iput(inode);
+        mntroot = d_obtain_alias(inode);
+        if (IS_ERR(mntroot)) {
                 dprintk("nfs_get_root: get root dentry failed\n");
-                return ERR_PTR(-ENOMEM);
+                return mntroot;
         }
 
         security_d_instantiate(mntroot, inode);
@@ -277,11 +276,10 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh)
          * if the dentry tree reaches them; however if the dentry already
          * exists, we'll pick it up at this point and use it as the root
          */
-        mntroot = d_alloc_anon(inode);
-        if (!mntroot) {
-                iput(inode);
+        mntroot = d_obtain_alias(inode);
+        if (IS_ERR(mntroot)) {
                 dprintk("nfs_get_root: get root dentry failed\n");
-                return ERR_PTR(-ENOMEM);
+                return mntroot;
         }
 
         security_d_instantiate(mntroot, inode);
diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
index 9e8a95be7a1e..2ca00153b6ec 100644
--- a/fs/ntfs/namei.c
+++ b/fs/ntfs/namei.c
@@ -304,8 +304,6 @@ static struct dentry *ntfs_get_parent(struct dentry *child_dent)
         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;
 
@@ -345,24 +343,8 @@ try_next:
         /* 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));
 }
 
 static struct inode *ntfs_nfs_get_inode(struct super_block *sb,
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 67527cebf214..2f27b332d8b3 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -68,14 +68,9 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
                 return ERR_PTR(-ESTALE);
         }
 
-        result = d_alloc_anon(inode);
-
-        if (!result) {
-                iput(inode);
-                mlog_errno(-ENOMEM);
-                return ERR_PTR(-ENOMEM);
-        }
-        result->d_op = &ocfs2_dentry_ops;
+        result = d_obtain_alias(inode);
+        if (!IS_ERR(result))
+                result->d_op = &ocfs2_dentry_ops;
 
         mlog_exit_ptr(result);
         return result;
@@ -86,7 +81,6 @@ static struct dentry *ocfs2_get_parent(struct dentry *child)
         int status;
         u64 blkno;
         struct dentry *parent;
-        struct inode *inode;
         struct inode *dir = child->d_inode;
 
         mlog_entry("(0x%p, '%.*s')\n", child,
@@ -109,21 +103,9 @@ static struct dentry *ocfs2_get_parent(struct dentry *child)
                 goto bail_unlock;
         }
 
-        inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
-        if (IS_ERR(inode)) {
-                mlog(ML_ERROR, "Unable to create inode %llu\n",
-                     (unsigned long long)blkno);
-                parent = ERR_PTR(-EACCES);
-                goto bail_unlock;
-        }
-
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
-
-        parent->d_op = &ocfs2_dentry_ops;
+        parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
+        if (!IS_ERR(parent))
+                parent->d_op = &ocfs2_dentry_ops;
 
 bail_unlock:
         ocfs2_inode_unlock(dir, 0);
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 5699171212ae..6c4c2c69449f 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -1522,7 +1522,6 @@ static struct dentry *reiserfs_get_dentry(struct super_block *sb,
 
 {
         struct cpu_key key;
-        struct dentry *result;
         struct inode *inode;
 
         key.on_disk_key.k_objectid = objectid;
@@ -1535,16 +1534,8 @@ static struct dentry *reiserfs_get_dentry(struct super_block *sb,
                 inode = NULL;
         }
         reiserfs_write_unlock(sb);
-        if (!inode)
-                inode = ERR_PTR(-ESTALE);
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-        result = d_alloc_anon(inode);
-        if (!result) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-        return result;
+
+        return d_obtain_alias(inode);
 }
 
 struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index c1add28dd45e..f89ebb943f3f 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -383,7 +383,6 @@ struct dentry *reiserfs_get_parent(struct dentry *child)
         struct inode *inode = NULL;
         struct reiserfs_dir_entry de;
         INITIALIZE_PATH(path_to_entry);
-        struct dentry *parent;
         struct inode *dir = child->d_inode;
 
         if (dir->i_nlink == 0) {
@@ -401,15 +400,7 @@ struct dentry *reiserfs_get_parent(struct dentry *child)
         inode = reiserfs_iget(dir->i_sb, (struct cpu_key *)&(de.de_dir_id));
         reiserfs_write_unlock(dir->i_sb);
 
-        if (!inode || IS_ERR(inode)) {
-                return ERR_PTR(-EACCES);
-        }
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
-        return parent;
+        return d_obtain_alias(inode);
 }
 
 /* add entry to the directory (entry can be hidden). 
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index d3231947db19..7578fae12d3c 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -1243,7 +1243,6 @@ end_rename:
 
 static struct dentry *udf_get_parent(struct dentry *child)
 {
-        struct dentry *parent;
         struct inode *inode = NULL;
         struct dentry dotdot;
         struct fileIdentDesc cfi;
@@ -1266,13 +1265,7 @@ static struct dentry *udf_get_parent(struct dentry *child)
                 goto out_unlock;
         unlock_kernel();
 
-        parent = d_alloc_anon(inode);
-        if (!parent) {
-                iput(inode);
-                parent = ERR_PTR(-ENOMEM);
-        }
-
-        return parent;
+        return d_obtain_alias(inode);
 out_unlock:
         unlock_kernel();
         return ERR_PTR(-EACCES);
@@ -1283,7 +1276,6 @@ static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
                                         u16 partref, __u32 generation)
 {
         struct inode *inode;
-        struct dentry *result;
         kernel_lb_addr loc;
 
         if (block == 0)
@@ -1300,12 +1292,7 @@ static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
                 iput(inode);
                 return ERR_PTR(-ESTALE);
         }
-        result = d_alloc_anon(inode);
-        if (!result) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-        return result;
+        return d_obtain_alias(inode);
 }
 
 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index 24fd598af846..7f7abec25e14 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -148,7 +148,6 @@ xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 {
         struct xfs_fid64        *fid64 = (struct xfs_fid64 *)fid;
         struct inode            *inode = NULL;
-        struct dentry           *result;
 
         if (fh_len < xfs_fileid_length(fileid_type))
                 return NULL;
@@ -164,16 +163,7 @@ xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
                 break;
         }
 
-        if (!inode)
-                return NULL;
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-        result = d_alloc_anon(inode);
-        if (!result) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-        return result;
+        return d_obtain_alias(inode);
 }
 
 STATIC struct dentry *
@@ -182,7 +172,6 @@ xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 {
         struct xfs_fid64        *fid64 = (struct xfs_fid64 *)fid;
         struct inode            *inode = NULL;
-        struct dentry           *result;
 
         switch (fileid_type) {
         case FILEID_INO32_GEN_PARENT:
@@ -195,16 +184,7 @@ xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
                 break;
         }
 
-        if (!inode)
-                return NULL;
-        if (IS_ERR(inode))
-                return ERR_CAST(inode);
-        result = d_alloc_anon(inode);
-        if (!result) {
-                iput(inode);
-                return ERR_PTR(-ENOMEM);
-        }
-        return result;
+        return d_obtain_alias(inode);
 }
 
 STATIC struct dentry *
@@ -213,18 +193,12 @@ xfs_fs_get_parent(
 {
         int                     error;
         struct xfs_inode        *cip;
-        struct dentry           *parent;
 
         error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
         if (unlikely(error))
                 return ERR_PTR(-error);
 
-        parent = d_alloc_anon(VFS_I(cip));
-        if (unlikely(!parent)) {
-                iput(VFS_I(cip));
-                return ERR_PTR(-ENOMEM);
-        }
-        return parent;
+        return d_obtain_alias(VFS_I(cip));
 }
 
 const struct export_operations xfs_export_operations = {
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index 48799ba7e3e6..d3438c72dcaf 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -311,11 +311,10 @@ xfs_open_by_handle(
                 return new_fd;
         }
 
-        dentry = d_alloc_anon(inode);
-        if (dentry == NULL) {
-                iput(inode);
+        dentry = d_obtain_alias(inode);
+        if (IS_ERR(dentry)) {
                 put_unused_fd(new_fd);
-                return -XFS_ERROR(ENOMEM);
+                return PTR_ERR(dentry);
         }
 
         /* Ensure umount returns EBUSY on umounts while this file is open. */