ext4: ->tmpfile() support

very similar to ext3 counterpart...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 6653fc3..f91002f 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2299,6 +2299,45 @@ retry:
        return err;
 }
 
+static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+       handle_t *handle;
+       struct inode *inode;
+       int err, retries = 0;
+
+       dquot_initialize(dir);
+
+retry:
+       inode = ext4_new_inode_start_handle(dir, mode,
+                                           NULL, 0, NULL,
+                                           EXT4_HT_DIR,
+                       EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
+                         4 + EXT4_XATTR_TRANS_BLOCKS);
+       handle = ext4_journal_current_handle();
+       err = PTR_ERR(inode);
+       if (!IS_ERR(inode)) {
+               inode->i_op = &ext4_file_inode_operations;
+               inode->i_fop = &ext4_file_operations;
+               ext4_set_aops(inode);
+               err = ext4_orphan_add(handle, inode);
+               if (err)
+                       goto err_drop_inode;
+               mark_inode_dirty(inode);
+               d_tmpfile(dentry, inode);
+               unlock_new_inode(inode);
+       }
+       if (handle)
+               ext4_journal_stop(handle);
+       if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
+               goto retry;
+       return err;
+err_drop_inode:
+       ext4_journal_stop(handle);
+       unlock_new_inode(inode);
+       iput(inode);
+       return err;
+}
+
 struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
                          struct ext4_dir_entry_2 *de,
                          int blocksize, int csum_size,
@@ -2906,7 +2945,7 @@ static int ext4_link(struct dentry *old_dentry,
 retry:
        handle = ext4_journal_start(dir, EXT4_HT_DIR,
                (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
-                EXT4_INDEX_EXTRA_TRANS_BLOCKS));
+                EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
        if (IS_ERR(handle))
                return PTR_ERR(handle);
 
@@ -2920,6 +2959,11 @@ retry:
        err = ext4_add_entry(handle, dentry, inode);
        if (!err) {
                ext4_mark_inode_dirty(handle, inode);
+               /* this can happen only for tmpfile being
+                * linked the first time
+                */
+               if (inode->i_nlink == 1)
+                       ext4_orphan_del(handle, inode);
                d_instantiate(dentry, inode);
        } else {
                drop_nlink(inode);
@@ -3172,6 +3216,7 @@ const struct inode_operations ext4_dir_inode_operations = {
        .mkdir          = ext4_mkdir,
        .rmdir          = ext4_rmdir,
        .mknod          = ext4_mknod,
+       .tmpfile        = ext4_tmpfile,
        .rename         = ext4_rename,
        .setattr        = ext4_setattr,
        .setxattr       = generic_setxattr,