d7cc431edd
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>
147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
/*
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* Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
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*
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* Uses debugfs to create fault injection points for client testing
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*/
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include "state.h"
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struct nfsd_fault_inject_op {
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char *file;
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u64 (*forget)(struct nfs4_client *, u64);
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u64 (*print)(struct nfs4_client *, u64);
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};
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static struct nfsd_fault_inject_op inject_ops[] = {
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{
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.file = "forget_clients",
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.forget = nfsd_forget_client,
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.print = nfsd_print_client,
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},
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{
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.file = "forget_locks",
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.forget = nfsd_forget_client_locks,
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.print = nfsd_print_client_locks,
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},
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{
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.file = "forget_openowners",
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.forget = nfsd_forget_client_openowners,
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.print = nfsd_print_client_openowners,
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},
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{
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.file = "forget_delegations",
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.forget = nfsd_forget_client_delegations,
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.print = nfsd_print_client_delegations,
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},
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{
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.file = "recall_delegations",
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.forget = nfsd_recall_client_delegations,
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.print = nfsd_print_client_delegations,
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},
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};
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static long int NUM_INJECT_OPS = sizeof(inject_ops) / sizeof(struct nfsd_fault_inject_op);
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static struct dentry *debug_dir;
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static void nfsd_inject_set(struct nfsd_fault_inject_op *op, u64 val)
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{
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u64 count = 0;
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if (val == 0)
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printk(KERN_INFO "NFSD Fault Injection: %s (all)", op->file);
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else
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printk(KERN_INFO "NFSD Fault Injection: %s (n = %llu)", op->file, val);
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nfs4_lock_state();
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count = nfsd_for_n_state(val, op->forget);
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nfs4_unlock_state();
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printk(KERN_INFO "NFSD: %s: found %llu", op->file, count);
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}
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static void nfsd_inject_get(struct nfsd_fault_inject_op *op, u64 *val)
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{
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nfs4_lock_state();
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*val = nfsd_for_n_state(0, op->print);
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nfs4_unlock_state();
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}
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static ssize_t fault_inject_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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static u64 val;
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char read_buf[25];
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size_t size, ret;
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loff_t pos = *ppos;
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if (!pos)
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nfsd_inject_get(file->f_dentry->d_inode->i_private, &val);
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size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
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if (pos < 0)
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return -EINVAL;
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if (pos >= size || !len)
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return 0;
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if (len > size - pos)
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len = size - pos;
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ret = copy_to_user(buf, read_buf + pos, len);
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if (ret == len)
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return -EFAULT;
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len -= ret;
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*ppos = pos + len;
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return len;
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}
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static ssize_t fault_inject_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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char write_buf[24];
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size_t size = min(sizeof(write_buf), len) - 1;
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u64 val;
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if (copy_from_user(write_buf, buf, size))
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return -EFAULT;
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val = simple_strtoll(write_buf, NULL, 0);
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nfsd_inject_set(file->f_dentry->d_inode->i_private, val);
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return len; /* on success, claim we got the whole input */
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}
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static const struct file_operations fops_nfsd = {
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.owner = THIS_MODULE,
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.read = fault_inject_read,
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.write = fault_inject_write,
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};
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void nfsd_fault_inject_cleanup(void)
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{
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debugfs_remove_recursive(debug_dir);
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}
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int nfsd_fault_inject_init(void)
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{
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unsigned int i;
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struct nfsd_fault_inject_op *op;
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umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
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debug_dir = debugfs_create_dir("nfsd", NULL);
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if (!debug_dir)
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goto fail;
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for (i = 0; i < NUM_INJECT_OPS; i++) {
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op = &inject_ops[i];
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if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
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goto fail;
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}
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return 0;
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fail:
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nfsd_fault_inject_cleanup();
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return -ENOMEM;
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}
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