1 files changed, 49 insertions, 7 deletions

diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
index 545f8e4ed101..19f9094bbb07 100644
--- a/fs/nfsd/fault_inject.c
+++ b/fs/nfsd/fault_inject.c
@@ -8,6 +8,7 @@
 #include <linux/fs.h>
 #include <linux/debugfs.h>
 #include <linux/module.h>
+#include <asm/uaccess.h>
 
 #include "state.h"
 
@@ -48,10 +49,9 @@ static struct nfsd_fault_inject_op inject_ops[] = {
 static long int NUM_INJECT_OPS = sizeof(inject_ops) / sizeof(struct nfsd_fault_inject_op);
 static struct dentry *debug_dir;
 
-static int nfsd_inject_set(void *op_ptr, u64 val)
+static void nfsd_inject_set(struct nfsd_fault_inject_op *op, u64 val)
 {
         u64 count = 0;
-        struct nfsd_fault_inject_op *op = op_ptr;
 
         if (val == 0)
                 printk(KERN_INFO "NFSD Fault Injection: %s (all)", op->file);
@@ -62,19 +62,61 @@ static int nfsd_inject_set(void *op_ptr, u64 val)
         count = nfsd_for_n_state(val, op->forget);
         nfs4_unlock_state();
         printk(KERN_INFO "NFSD: %s: found %llu", op->file, count);
-        return 0;
 }
 
-static int nfsd_inject_get(void *op_ptr, u64 *val)
+static void nfsd_inject_get(struct nfsd_fault_inject_op *op, u64 *val)
 {
-        struct nfsd_fault_inject_op *op = op_ptr;
         nfs4_lock_state();
         *val = nfsd_for_n_state(0, op->print);
         nfs4_unlock_state();
-        return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(fops_nfsd, nfsd_inject_get, nfsd_inject_set, "%llu\n");
+static ssize_t fault_inject_read(struct file *file, char __user *buf,
+                                 size_t len, loff_t *ppos)
+{
+        static u64 val;
+        char read_buf[25];
+        size_t size, ret;
+        loff_t pos = *ppos;
+
+        if (!pos)
+                nfsd_inject_get(file->f_dentry->d_inode->i_private, &val);
+        size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
+
+        if (pos < 0)
+                return -EINVAL;
+        if (pos >= size || !len)
+                return 0;
+        if (len > size - pos)
+                len = size - pos;
+        ret = copy_to_user(buf, read_buf + pos, len);
+        if (ret == len)
+                return -EFAULT;
+        len -= ret;
+        *ppos = pos + len;
+        return len;
+}
+
+static ssize_t fault_inject_write(struct file *file, const char __user *buf,
+                                  size_t len, loff_t *ppos)
+{
+        char write_buf[24];
+        size_t size = min(sizeof(write_buf), len) - 1;
+        u64 val;
+
+        if (copy_from_user(write_buf, buf, size))
+                return -EFAULT;
+
+        val = simple_strtoll(write_buf, NULL, 0);
+        nfsd_inject_set(file->f_dentry->d_inode->i_private, val);
+        return len; /* on success, claim we got the whole input */
+}
+
+static const struct file_operations fops_nfsd = {
+        .owner   = THIS_MODULE,
+        .read    = fault_inject_read,
+        .write   = fault_inject_write,
+};
 
 void nfsd_fault_inject_cleanup(void)
 {