cregit-Linux how code gets into the kernel

Release 4.10 fs/nfsd/fault_inject.c

Directory: fs/nfsd
/*
 * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
 *
 * Uses debugfs to create fault injection points for client testing
 */

#include <linux/types.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/nsproxy.h>
#include <linux/sunrpc/addr.h>
#include <linux/uaccess.h>

#include "state.h"
#include "netns.h"


struct nfsd_fault_inject_op {
	
char *file;
	
u64 (*get)(void);
	
u64 (*set_val)(u64);
	
u64 (*set_clnt)(struct sockaddr_storage *, size_t);
};


static struct dentry *debug_dir;


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; loff_t pos = *ppos; struct nfsd_fault_inject_op *op = file_inode(file)->i_private; if (!pos) val = op->get(); size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val); return simple_read_from_buffer(buf, len, ppos, read_buf, size); }

Contributors

PersonTokensPropCommitsCommitProp
bryan schumakerbryan schumaker7173.96%233.33%
jeff laytonjeff layton1616.67%233.33%
kinglong meekinglong mee66.25%116.67%
al viroal viro33.12%116.67%
Total96100.00%6100.00%


static ssize_t fault_inject_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos) { char write_buf[INET6_ADDRSTRLEN]; size_t size = min(sizeof(write_buf) - 1, len); struct net *net = current->nsproxy->net_ns; struct sockaddr_storage sa; struct nfsd_fault_inject_op *op = file_inode(file)->i_private; u64 val; char *nl; if (copy_from_user(write_buf, buf, size)) return -EFAULT; write_buf[size] = '\0'; /* Deal with any embedded newlines in the string */ nl = strchr(write_buf, '\n'); if (nl) { size = nl - write_buf; *nl = '\0'; } size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa)); if (size > 0) { val = op->set_clnt(&sa, size); if (val) pr_info("NFSD [%s]: Client %s had %llu state object(s)\n", op->file, write_buf, val); } else { val = simple_strtoll(write_buf, NULL, 0); if (val == 0) pr_info("NFSD Fault Injection: %s (all)", op->file); else pr_info("NFSD Fault Injection: %s (n = %llu)", op->file, val); val = op->set_val(val); pr_info("NFSD: %s: found %llu", op->file, val); } return len; /* on success, claim we got the whole input */ }

Contributors

PersonTokensPropCommitsCommitProp
bryan schumakerbryan schumaker14757.87%457.14%
jeff laytonjeff layton10541.34%228.57%
al viroal viro20.79%114.29%
Total254100.00%7100.00%

static const struct file_operations fops_nfsd = { .owner = THIS_MODULE, .read = fault_inject_read, .write = fault_inject_write, };
void nfsd_fault_inject_cleanup(void) { debugfs_remove_recursive(debug_dir); }

Contributors

PersonTokensPropCommitsCommitProp
bryan schumakerbryan schumaker12100.00%1100.00%
Total12100.00%1100.00%

static struct nfsd_fault_inject_op inject_ops[] = { { .file = "forget_clients", .get = nfsd_inject_print_clients, .set_val = nfsd_inject_forget_clients, .set_clnt = nfsd_inject_forget_client, }, { .file = "forget_locks", .get = nfsd_inject_print_locks, .set_val = nfsd_inject_forget_locks, .set_clnt = nfsd_inject_forget_client_locks, }, { .file = "forget_openowners", .get = nfsd_inject_print_openowners, .set_val = nfsd_inject_forget_openowners, .set_clnt = nfsd_inject_forget_client_openowners, }, { .file = "forget_delegations", .get = nfsd_inject_print_delegations, .set_val = nfsd_inject_forget_delegations, .set_clnt = nfsd_inject_forget_client_delegations, }, { .file = "recall_delegations", .get = nfsd_inject_print_delegations, .set_val = nfsd_inject_recall_delegations, .set_clnt = nfsd_inject_recall_client_delegations, }, }; #define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
int nfsd_fault_inject_init(void) { unsigned int i; struct nfsd_fault_inject_op *op; umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; debug_dir = debugfs_create_dir("nfsd", NULL); if (!debug_dir) goto fail; for (i = 0; i < NUM_INJECT_OPS; i++) { op = &inject_ops[i]; if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd)) goto fail; } return 0; fail: nfsd_fault_inject_cleanup(); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
bryan schumakerbryan schumaker9898.99%150.00%
al viroal viro11.01%150.00%
Total99100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
bryan schumakerbryan schumaker39257.65%422.22%
jeff laytonjeff layton27540.44%1055.56%
kinglong meekinglong mee60.88%15.56%
al viroal viro60.88%211.11%
linus torvaldslinus torvalds10.15%15.56%
Total680100.00%18100.00%
Directory: fs/nfsd
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