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-rw-r--r--target/linux/generic/patches-4.4/052-01-ubifs-Implement-O_TMPFILE.patch99
1 files changed, 99 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/052-01-ubifs-Implement-O_TMPFILE.patch b/target/linux/generic/patches-4.4/052-01-ubifs-Implement-O_TMPFILE.patch
new file mode 100644
index 0000000000..957935c6af
--- /dev/null
+++ b/target/linux/generic/patches-4.4/052-01-ubifs-Implement-O_TMPFILE.patch
@@ -0,0 +1,99 @@
+From: Richard Weinberger <richard@nod.at>
+Date: Tue, 13 Sep 2016 16:18:55 +0200
+Subject: [PATCH] ubifs: Implement O_TMPFILE
+
+This patchs adds O_TMPFILE support to UBIFS.
+A temp file is a reference to an unlinked inode, a user
+holding the reference can use it. As soon it is being closed
+all data vanishes.
+
+Signed-off-by: Richard Weinberger <richard@nod.at>
+---
+
+--- a/fs/ubifs/dir.c
++++ b/fs/ubifs/dir.c
+@@ -301,6 +301,76 @@ out_budg:
+ return err;
+ }
+
++static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
++ umode_t mode)
++{
++ struct inode *inode;
++ struct ubifs_info *c = dir->i_sb->s_fs_info;
++ struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};
++ struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
++ struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
++ int err, instantiated = 0;
++
++ /*
++ * Budget request settings: new dirty inode, new direntry,
++ * budget for dirtied inode will be released via writeback.
++ */
++
++ dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
++ dentry, mode, dir->i_ino);
++
++ err = ubifs_budget_space(c, &req);
++ if (err)
++ return err;
++
++ err = ubifs_budget_space(c, &ino_req);
++ if (err) {
++ ubifs_release_budget(c, &req);
++ return err;
++ }
++
++ inode = ubifs_new_inode(c, dir, mode);
++ if (IS_ERR(inode)) {
++ err = PTR_ERR(inode);
++ goto out_budg;
++ }
++ ui = ubifs_inode(inode);
++
++ err = ubifs_init_security(dir, inode, &dentry->d_name);
++ if (err)
++ goto out_inode;
++
++ mutex_lock(&ui->ui_mutex);
++ insert_inode_hash(inode);
++ d_tmpfile(dentry, inode);
++ ubifs_assert(ui->dirty);
++ instantiated = 1;
++ mutex_unlock(&ui->ui_mutex);
++
++ mutex_lock(&dir_ui->ui_mutex);
++ err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
++ if (err)
++ goto out_cancel;
++ mutex_unlock(&dir_ui->ui_mutex);
++
++ ubifs_release_budget(c, &req);
++
++ return 0;
++
++out_cancel:
++ mutex_unlock(&dir_ui->ui_mutex);
++out_inode:
++ make_bad_inode(inode);
++ if (!instantiated)
++ iput(inode);
++out_budg:
++ ubifs_release_budget(c, &req);
++ if (!instantiated)
++ ubifs_release_budget(c, &ino_req);
++ ubifs_err(c, "cannot create temporary file, error %d", err);
++ return err;
++}
++
+ /**
+ * vfs_dent_type - get VFS directory entry type.
+ * @type: UBIFS directory entry type
+@@ -1189,6 +1259,7 @@ const struct inode_operations ubifs_dir_
+ #ifdef CONFIG_UBIFS_ATIME_SUPPORT
+ .update_time = ubifs_update_time,
+ #endif
++ .tmpfile = ubifs_tmpfile,
+ };
+
+ const struct file_operations ubifs_dir_operations = {