dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

NFSD: Add a custom file operations structure for fault injection 

Controlling the read and write functions allows me to add in "forget
client w.x.y.z", since we won't be limited to reading and writing only
u64 values.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Bryan Schumaker 2012-11-29 11:40:45 -05:00 committed by J. Bruce Fields
parent 184c18471f
commit d7cc431edd
1 changed files with 49 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
fs/nfsd/fault_inject.c
View File

@ -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)
{