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Subject[PATCH 28/42] Unionfs: async I/O queue operations
Date
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---
fs/unionfs/sioq.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 119 insertions(+), 0 deletions(-)
create mode 100644 fs/unionfs/sioq.c

diff --git a/fs/unionfs/sioq.c b/fs/unionfs/sioq.c
new file mode 100644
index 0000000..2a8c88e
--- /dev/null
+++ b/fs/unionfs/sioq.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2006-2007 Erez Zadok
+ * Copyright (c) 2006 Charles P. Wright
+ * Copyright (c) 2006-2007 Josef 'Jeff' Sipek
+ * Copyright (c) 2006 Junjiro Okajima
+ * Copyright (c) 2006 David P. Quigley
+ * Copyright (c) 2006-2007 Stony Brook University
+ * Copyright (c) 2006-2007 The Research Foundation of SUNY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "union.h"
+
+/*
+ * Super-user IO work Queue - sometimes we need to perform actions which
+ * would fail due to the unix permissions on the parent directory (e.g.,
+ * rmdir a directory which appears empty, but in reality contains
+ * whiteouts).
+ */
+
+static struct workqueue_struct *superio_workqueue;
+
+int __init init_sioq(void)
+{
+ int err;
+
+ superio_workqueue = create_workqueue("unionfs_siod");
+ if (!IS_ERR(superio_workqueue))
+ return 0;
+
+ err = PTR_ERR(superio_workqueue);
+ printk(KERN_ERR "unionfs: create_workqueue failed %d\n", err);
+ superio_workqueue = NULL;
+ return err;
+}
+
+void stop_sioq(void)
+{
+ if (superio_workqueue)
+ destroy_workqueue(superio_workqueue);
+}
+
+void run_sioq(work_func_t func, struct sioq_args *args)
+{
+ INIT_WORK(&args->work, func);
+
+ init_completion(&args->comp);
+ while (!queue_work(superio_workqueue, &args->work)) {
+ /* TODO: do accounting if needed */
+ schedule();
+ }
+ wait_for_completion(&args->comp);
+}
+
+void __unionfs_create(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+ struct create_args *c = &args->create;
+
+ args->err = vfs_create(c->parent, c->dentry, c->mode, c->nd);
+ complete(&args->comp);
+}
+
+void __unionfs_mkdir(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+ struct mkdir_args *m = &args->mkdir;
+
+ args->err = vfs_mkdir(m->parent, m->dentry, m->mode);
+ complete(&args->comp);
+}
+
+void __unionfs_mknod(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+ struct mknod_args *m = &args->mknod;
+
+ args->err = vfs_mknod(m->parent, m->dentry, m->mode, m->dev);
+ complete(&args->comp);
+}
+
+void __unionfs_symlink(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+ struct symlink_args *s = &args->symlink;
+
+ args->err = vfs_symlink(s->parent, s->dentry, s->symbuf, s->mode);
+ complete(&args->comp);
+}
+
+void __unionfs_unlink(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+ struct unlink_args *u = &args->unlink;
+
+ args->err = vfs_unlink(u->parent, u->dentry);
+ complete(&args->comp);
+}
+
+void __delete_whiteouts(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+ struct deletewh_args *d = &args->deletewh;
+
+ args->err = do_delete_whiteouts(d->dentry, d->bindex, d->namelist);
+ complete(&args->comp);
+}
+
+void __is_opaque_dir(struct work_struct *work)
+{
+ struct sioq_args *args = container_of(work, struct sioq_args, work);
+
+ args->ret = lookup_one_len(UNIONFS_DIR_OPAQUE, args->is_opaque.dentry,
+ sizeof(UNIONFS_DIR_OPAQUE) - 1);
+ complete(&args->comp);
+}
--
1.5.2.2


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