ext4: ->tmpfile() support

very similar to ext3 counterpart...

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

1 files changed, 46 insertions, 1 deletions

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 6653fc35ecb7..f91002f8c017 100644
--- 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,