mirror of https://github.com/hak5/openwrt.git
100 lines
2.4 KiB
Diff
100 lines
2.4 KiB
Diff
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From: Richard Weinberger <richard@nod.at>
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Date: Tue, 13 Sep 2016 16:18:55 +0200
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Subject: [PATCH] ubifs: Implement O_TMPFILE
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This patchs adds O_TMPFILE support to UBIFS.
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A temp file is a reference to an unlinked inode, a user
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holding the reference can use it. As soon it is being closed
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all data vanishes.
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Signed-off-by: Richard Weinberger <richard@nod.at>
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---
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--- a/fs/ubifs/dir.c
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+++ b/fs/ubifs/dir.c
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@@ -301,6 +301,76 @@ out_budg:
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return err;
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}
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+static int ubifs_tmpfile(struct inode *dir, struct dentry *dentry,
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+ umode_t mode)
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+{
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+ struct inode *inode;
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+ struct ubifs_info *c = dir->i_sb->s_fs_info;
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+ struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1};
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+ struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
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+ struct ubifs_inode *ui, *dir_ui = ubifs_inode(dir);
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+ int err, instantiated = 0;
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+
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+ /*
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+ * Budget request settings: new dirty inode, new direntry,
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+ * budget for dirtied inode will be released via writeback.
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+ */
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+
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+ dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
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+ dentry, mode, dir->i_ino);
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+
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+ err = ubifs_budget_space(c, &req);
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+ if (err)
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+ return err;
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+
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+ err = ubifs_budget_space(c, &ino_req);
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+ if (err) {
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+ ubifs_release_budget(c, &req);
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+ return err;
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+ }
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+
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+ inode = ubifs_new_inode(c, dir, mode);
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+ if (IS_ERR(inode)) {
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+ err = PTR_ERR(inode);
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+ goto out_budg;
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+ }
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+ ui = ubifs_inode(inode);
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+
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+ err = ubifs_init_security(dir, inode, &dentry->d_name);
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+ if (err)
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+ goto out_inode;
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+
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+ mutex_lock(&ui->ui_mutex);
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+ insert_inode_hash(inode);
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+ d_tmpfile(dentry, inode);
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+ ubifs_assert(ui->dirty);
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+ instantiated = 1;
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+ mutex_unlock(&ui->ui_mutex);
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+
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+ mutex_lock(&dir_ui->ui_mutex);
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+ err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0);
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+ if (err)
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+ goto out_cancel;
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+ mutex_unlock(&dir_ui->ui_mutex);
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+
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+ ubifs_release_budget(c, &req);
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+
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+ return 0;
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+
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+out_cancel:
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+ mutex_unlock(&dir_ui->ui_mutex);
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+out_inode:
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+ make_bad_inode(inode);
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+ if (!instantiated)
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+ iput(inode);
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+out_budg:
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+ ubifs_release_budget(c, &req);
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+ if (!instantiated)
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+ ubifs_release_budget(c, &ino_req);
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+ ubifs_err(c, "cannot create temporary file, error %d", err);
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+ return err;
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+}
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+
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/**
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* vfs_dent_type - get VFS directory entry type.
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* @type: UBIFS directory entry type
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@@ -1189,6 +1259,7 @@ const struct inode_operations ubifs_dir_
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#ifdef CONFIG_UBIFS_ATIME_SUPPORT
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.update_time = ubifs_update_time,
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#endif
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+ .tmpfile = ubifs_tmpfile,
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};
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const struct file_operations ubifs_dir_operations = {
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