2 files changed, 50 insertions, 5 deletions

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index c5ee9f0691e3..84be02e93652 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -925,7 +925,7 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
         set_buffer_new(bh_result);
 got_it:
         map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key));
-        if (blocks_to_boundary == 0)
+        if (count > blocks_to_boundary)
                 set_buffer_boundary(bh_result);
         err = count;
         /* Clean up and exit */
@@ -1009,11 +1009,14 @@ struct buffer_head *ext3_getblk(handle_t *handle, struct inode *inode,
         buffer_trace_init(&dummy.b_history);
         err = ext3_get_blocks_handle(handle, inode, block, 1,
                                         &dummy, create, 1);
-        if (err == 1) {
+        /*
+         * ext3_get_blocks_handle() returns number of blocks
+         * mapped. 0 in case of a HOLE.
+         */
+        if (err > 0) {
+                if (err > 1)
+                        WARN_ON(1);
                 err = 0;
-        } else if (err >= 0) {
-                WARN_ON(1);
-                err = -EIO;
         }
         *errp = err;
         if (!err && buffer_mapped(&dummy)) {
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 813d589cc6c0..3559086eee5f 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -554,6 +554,47 @@ static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
         return 0;
 }
 
+
+static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
+{
+        __u32 *objp = vobjp;
+        unsigned long ino = objp[0];
+        __u32 generation = objp[1];
+        struct inode *inode;
+        struct dentry *result;
+
+        if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
+                return ERR_PTR(-ESTALE);
+        if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
+                return ERR_PTR(-ESTALE);
+
+        /* iget isn't really right if the inode is currently unallocated!!
+         *
+         * ext3_read_inode will return a bad_inode if the inode had been
+         * deleted, so we should be safe.
+         *
+         * Currently we don't know the generation for parent directory, so
+         * a generation of 0 means "accept any"
+         */
+        inode = iget(sb, ino);
+        if (inode == NULL)
+                return ERR_PTR(-ENOMEM);
+        if (is_bad_inode(inode) ||
+            (generation && inode->i_generation != generation)) {
+                iput(inode);
+                return ERR_PTR(-ESTALE);
+        }
+        /* now to find a dentry.
+         * If possible, get a well-connected one
+         */
+        result = d_alloc_anon(inode);
+        if (!result) {
+                iput(inode);
+                return ERR_PTR(-ENOMEM);
+        }
+        return result;
+}
+
 #ifdef CONFIG_QUOTA
 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
@@ -622,6 +663,7 @@ static struct super_operations ext3_sops = {
 
 static struct export_operations ext3_export_ops = {
         .get_parent = ext3_get_parent,
+        .get_dentry = ext3_get_dentry,
 };
 
 enum {