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authorChuck Lever <chuck.lever@oracle.com>2021-08-05 17:25:49 +0300
committerChuck Lever <chuck.lever@oracle.com>2021-08-20 20:50:32 +0300
commita4ae308143961bf688e1c8a62f6604e62b491120 (patch)
tree9f74ae2fc868d1474b282f09bf1e78b09f393bbd /net/sunrpc
parentc782af250083f69ba810e79b60a552252e777416 (diff)
downloadlinux-a4ae308143961bf688e1c8a62f6604e62b491120.tar.xz
SUNRPC: Move client-side disconnect injection
Disconnect injection stress-tests the ability for both client and server implementations to behave resiliently in the face of network instability. Convert the existing client-side disconnect injection infrastructure to use the kernel's generic error injection facility. The generic facility has a richer set of injection criteria. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/debugfs.c78
-rw-r--r--net/sunrpc/fail.h2
-rw-r--r--net/sunrpc/xprt.c14
3 files changed, 30 insertions, 64 deletions
diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index eaeb51f83abd..04e453ad3508 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -16,8 +16,6 @@ static struct dentry *topdir;
static struct dentry *rpc_clnt_dir;
static struct dentry *rpc_xprt_dir;
-unsigned int rpc_inject_disconnect;
-
static int
tasks_show(struct seq_file *f, void *v)
{
@@ -237,8 +235,6 @@ rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
/* make tasks file */
debugfs_create_file("info", S_IFREG | 0400, xprt->debugfs, xprt,
&xprt_info_fops);
-
- atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
}
void
@@ -248,62 +244,26 @@ rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
xprt->debugfs = NULL;
}
-static int
-fault_open(struct inode *inode, struct file *filp)
-{
- filp->private_data = kmalloc(128, GFP_KERNEL);
- if (!filp->private_data)
- return -ENOMEM;
- return 0;
-}
+#if IS_ENABLED(CONFIG_FAIL_SUNRPC)
+struct fail_sunrpc_attr fail_sunrpc = {
+ .attr = FAULT_ATTR_INITIALIZER,
+};
+EXPORT_SYMBOL_GPL(fail_sunrpc);
-static int
-fault_release(struct inode *inode, struct file *filp)
+static void fail_sunrpc_init(void)
{
- kfree(filp->private_data);
- return 0;
-}
+ struct dentry *dir;
-static ssize_t
-fault_disconnect_read(struct file *filp, char __user *user_buf,
- size_t len, loff_t *offset)
-{
- char *buffer = (char *)filp->private_data;
- size_t size;
+ dir = fault_create_debugfs_attr("fail_sunrpc", NULL,
+ &fail_sunrpc.attr);
- size = sprintf(buffer, "%u\n", rpc_inject_disconnect);
- return simple_read_from_buffer(user_buf, len, offset, buffer, size);
+ debugfs_create_bool("ignore-client-disconnect", S_IFREG | 0600, dir,
+ &fail_sunrpc.ignore_client_disconnect);
}
-
-static ssize_t
-fault_disconnect_write(struct file *filp, const char __user *user_buf,
- size_t len, loff_t *offset)
+#else
+static void fail_sunrpc_init(void)
{
- char buffer[16];
-
- if (len >= sizeof(buffer))
- len = sizeof(buffer) - 1;
- if (copy_from_user(buffer, user_buf, len))
- return -EFAULT;
- buffer[len] = '\0';
- if (kstrtouint(buffer, 10, &rpc_inject_disconnect))
- return -EINVAL;
- return len;
}
-
-static const struct file_operations fault_disconnect_fops = {
- .owner = THIS_MODULE,
- .open = fault_open,
- .read = fault_disconnect_read,
- .write = fault_disconnect_write,
- .release = fault_release,
-};
-
-#if IS_ENABLED(CONFIG_FAIL_SUNRPC)
-struct fail_sunrpc_attr fail_sunrpc = {
- .attr = FAULT_ATTR_INITIALIZER,
-};
-EXPORT_SYMBOL_GPL(fail_sunrpc);
#endif
void __exit
@@ -318,21 +278,11 @@ sunrpc_debugfs_exit(void)
void __init
sunrpc_debugfs_init(void)
{
- struct dentry *rpc_fault_dir;
-
topdir = debugfs_create_dir("sunrpc", NULL);
rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
- rpc_fault_dir = debugfs_create_dir("inject_fault", topdir);
-
- debugfs_create_file("disconnect", S_IFREG | 0400, rpc_fault_dir, NULL,
- &fault_disconnect_fops);
-
-#if IS_ENABLED(CONFIG_FAIL_SUNRPC)
- fault_create_debugfs_attr("fail_sunrpc", NULL,
- &fail_sunrpc.attr);
-#endif
+ fail_sunrpc_init();
}
diff --git a/net/sunrpc/fail.h b/net/sunrpc/fail.h
index 1d402b0d3453..62c1b9fd59e2 100644
--- a/net/sunrpc/fail.h
+++ b/net/sunrpc/fail.h
@@ -12,6 +12,8 @@
struct fail_sunrpc_attr {
struct fault_attr attr;
+
+ bool ignore_client_disconnect;
};
extern struct fail_sunrpc_attr fail_sunrpc;
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index fb6db09725c7..05abe344a269 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -56,6 +56,7 @@
#include "sunrpc.h"
#include "sysfs.h"
+#include "fail.h"
/*
* Local variables
@@ -855,6 +856,19 @@ xprt_init_autodisconnect(struct timer_list *t)
queue_work(xprtiod_workqueue, &xprt->task_cleanup);
}
+#if IS_ENABLED(CONFIG_FAIL_SUNRPC)
+static void xprt_inject_disconnect(struct rpc_xprt *xprt)
+{
+ if (!fail_sunrpc.ignore_client_disconnect &&
+ should_fail(&fail_sunrpc.attr, 1))
+ xprt->ops->inject_disconnect(xprt);
+}
+#else
+static inline void xprt_inject_disconnect(struct rpc_xprt *xprt)
+{
+}
+#endif
+
bool xprt_lock_connect(struct rpc_xprt *xprt,
struct rpc_task *task,
void *cookie)