mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 14:37:57 +00:00
100 lines
2.4 KiB
Diff
100 lines
2.4 KiB
Diff
|
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 = {
|