diff options
| -rw-r--r-- | fs/nfsd/Kconfig | 10 | ||||
| -rw-r--r-- | fs/nfsd/Makefile | 1 | ||||
| -rw-r--r-- | fs/nfsd/fault_inject.c | 91 | ||||
| -rw-r--r-- | fs/nfsd/fault_inject.h | 28 | ||||
| -rw-r--r-- | fs/nfsd/nfs4state.c | 115 | ||||
| -rw-r--r-- | fs/nfsd/nfsctl.c | 7 |
6 files changed, 252 insertions, 0 deletions
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig index 10e6366608f2..8df1ea4a6ff9 100644 --- a/fs/nfsd/Kconfig +++ b/fs/nfsd/Kconfig @@ -80,3 +80,13 @@ config NFSD_V4 available from http://linux-nfs.org/. If unsure, say N. + +config NFSD_FAULT_INJECTION + bool "NFS server manual fault injection" + depends on NFSD_V4 && DEBUG_KERNEL + help + This option enables support for manually injecting faults + into the NFS server. This is intended to be used for + testing error recovery on the NFS client. + + If unsure, say N. diff --git a/fs/nfsd/Makefile b/fs/nfsd/Makefile index 9b118ee20193..af32ef06b4fe 100644 --- a/fs/nfsd/Makefile +++ b/fs/nfsd/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_NFSD) += nfsd.o nfsd-y := nfssvc.o nfsctl.o nfsproc.o nfsfh.o vfs.o \ export.o auth.o lockd.o nfscache.o nfsxdr.o stats.o +nfsd-$(CONFIG_NFSD_FAULT_INJECTION) += fault_inject.o nfsd-$(CONFIG_NFSD_V2_ACL) += nfs2acl.o nfsd-$(CONFIG_NFSD_V3) += nfs3proc.o nfs3xdr.o nfsd-$(CONFIG_NFSD_V3_ACL) += nfs3acl.o diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c new file mode 100644 index 000000000000..ce7f0758d84c --- /dev/null +++ b/fs/nfsd/fault_inject.c @@ -0,0 +1,91 @@ +/* + * 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 "state.h" +#include "fault_inject.h" + +struct nfsd_fault_inject_op { + char *file; + void (*func)(u64); +}; + +static struct nfsd_fault_inject_op inject_ops[] = { + { + .file = "forget_clients", + .func = nfsd_forget_clients, + }, + { + .file = "forget_locks", + .func = nfsd_forget_locks, + }, + { + .file = "forget_openowners", + .func = nfsd_forget_openowners, + }, + { + .file = "forget_delegations", + .func = nfsd_forget_delegations, + }, + { + .file = "recall_delegations", + .func = nfsd_recall_delegations, + }, +}; + +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) +{ + struct nfsd_fault_inject_op *op = op_ptr; + + if (val == 0) + printk(KERN_INFO "NFSD Fault Injection: %s (all)", op->file); + else + printk(KERN_INFO "NFSD Fault Injection: %s (n = %llu)", op->file, val); + + op->func(val); + return 0; +} + +static int nfsd_inject_get(void *data, u64 *val) +{ + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(fops_nfsd, nfsd_inject_get, nfsd_inject_set, "%llu\n"); + +void nfsd_fault_inject_cleanup(void) +{ + debugfs_remove_recursive(debug_dir); +} + +int nfsd_fault_inject_init(void) +{ + unsigned int i; + struct nfsd_fault_inject_op *op; + mode_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; +} diff --git a/fs/nfsd/fault_inject.h b/fs/nfsd/fault_inject.h new file mode 100644 index 000000000000..90bd0570956c --- /dev/null +++ b/fs/nfsd/fault_inject.h @@ -0,0 +1,28 @@ +/* + * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com> + * + * Function definitions for fault injection + */ + +#ifndef LINUX_NFSD_FAULT_INJECT_H +#define LINUX_NFSD_FAULT_INJECT_H + +#ifdef CONFIG_NFSD_FAULT_INJECTION +int nfsd_fault_inject_init(void); +void nfsd_fault_inject_cleanup(void); +void nfsd_forget_clients(u64); +void nfsd_forget_locks(u64); +void nfsd_forget_openowners(u64); +void nfsd_forget_delegations(u64); +void nfsd_recall_delegations(u64); +#else /* CONFIG_NFSD_FAULT_INJECTION */ +static inline int nfsd_fault_inject_init(void) { return 0; } +static inline void nfsd_fault_inject_cleanup(void) {} +static inline void nfsd_forget_clients(u64 num) {} +static inline void nfsd_forget_locks(u64 num) {} +static inline void nfsd_forget_openowners(u64 num) {} +static inline void nfsd_forget_delegations(u64 num) {} +static inline void nfsd_recall_delegations(u64 num) {} +#endif /* CONFIG_NFSD_FAULT_INJECTION */ + +#endif /* LINUX_NFSD_FAULT_INJECT_H */ diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index d09d5242c088..a511eff05698 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -4429,6 +4429,121 @@ nfs4_check_open_reclaim(clientid_t *clid) return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; } +#ifdef CONFIG_NFSD_FAULT_INJECTION + +void nfsd_forget_clients(u64 num) +{ + struct nfs4_client *clp, *next; + int count = 0; + + nfs4_lock_state(); + list_for_each_entry_safe(clp, next, &client_lru, cl_lru) { + nfsd4_remove_clid_dir(clp); + expire_client(clp); + if (++count == num) + break; + } + nfs4_unlock_state(); + + printk(KERN_INFO "NFSD: Forgot %d clients", count); +} + +static void release_lockowner_sop(struct nfs4_stateowner *sop) +{ + release_lockowner(lockowner(sop)); +} + +static void release_openowner_sop(struct nfs4_stateowner *sop) +{ + release_openowner(openowner(sop)); +} + +static int nfsd_release_n_owners(u64 num, + struct list_head hashtbl[], + unsigned int hashtbl_size, + void (*release_sop)(struct nfs4_stateowner *)) +{ + int i, count = 0; + struct nfs4_stateowner *sop, *next; + + for (i = 0; i < hashtbl_size; i++) { + list_for_each_entry_safe(sop, next, &hashtbl[i], so_strhash) { + release_sop(sop); + if (++count == num) + return count; + } + } + return count; +} + +void nfsd_forget_locks(u64 num) +{ + int count; + + nfs4_lock_state(); + count = nfsd_release_n_owners(num, lock_ownerstr_hashtbl, + LOCK_HASH_SIZE, release_lockowner_sop); + nfs4_unlock_state(); + + printk(KERN_INFO "NFSD: Forgot %d locks", count); +} + +void nfsd_forget_openowners(u64 num) +{ + int count; + + nfs4_lock_state(); + count = nfsd_release_n_owners(num, open_ownerstr_hashtbl, + OPEN_OWNER_HASH_SIZE, release_openowner_sop); + nfs4_unlock_state(); + + printk(KERN_INFO "NFSD: Forgot %d open owners", count); +} + +int nfsd_process_n_delegations(u64 num, void (*deleg_func)(struct nfs4_delegation *)) +{ + int i, count = 0; + struct nfs4_file *fp; + struct nfs4_delegation *dp, *next; + + for (i = 0; i < FILE_HASH_SIZE; i++) { + list_for_each_entry(fp, &file_hashtbl[i], fi_hash) { + list_for_each_entry_safe(dp, next, &fp->fi_delegations, dl_perfile) { + deleg_func(dp); + if (++count == num) + return count; + } + } + } + return count; +} + +void nfsd_forget_delegations(u64 num) +{ + unsigned int count; + + nfs4_lock_state(); + count = nfsd_process_n_delegations(num, unhash_delegation); + nfs4_unlock_state(); + + printk(KERN_INFO "NFSD: Forgot %d delegations", count); +} + +void nfsd_recall_delegations(u64 num) +{ + unsigned int count; + + nfs4_lock_state(); + spin_lock(&recall_lock); + count = nfsd_process_n_delegations(num, nfsd_break_one_deleg); + spin_unlock(&recall_lock); + nfs4_unlock_state(); + + printk(KERN_INFO "NFSD: Recalled %d delegations", count); +} + +#endif /* CONFIG_NFSD_FAULT_INJECTION */ + /* initialization to perform at module load time: */ int diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index c45a2ea4a090..b2e8093ebc21 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -18,6 +18,7 @@ #include "idmap.h" #include "nfsd.h" #include "cache.h" +#include "fault_inject.h" /* * We have a single directory with several nodes in it. @@ -1131,6 +1132,9 @@ static int __init init_nfsd(void) retval = nfs4_state_init(); /* nfs4 locking state */ if (retval) return retval; + retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */ + if (retval) + goto out_free_slabs; nfsd_stat_init(); /* Statistics */ retval = nfsd_reply_cache_init(); if (retval) @@ -1161,6 +1165,8 @@ out_free_cache: nfsd_reply_cache_shutdown(); out_free_stat: nfsd_stat_shutdown(); + nfsd_fault_inject_cleanup(); +out_free_slabs: nfsd4_free_slabs(); return retval; } @@ -1175,6 +1181,7 @@ static void __exit exit_nfsd(void) nfsd_lockd_shutdown(); nfsd_idmap_shutdown(); nfsd4_free_slabs(); + nfsd_fault_inject_cleanup(); unregister_filesystem(&nfsd_fs_type); } |