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- 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
- @@ -1195,6 +1265,7 @@ 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 = {
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