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NFSD: Add a custom file operations structure for fault injection

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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
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56
fs/nfsd/fault_inject.c
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@ -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)
{