/* * linux/fs/nfs/inode.c * * Copyright (C) 1992 Rick Sladkey * * nfs inode and superblock handling functions * * Modularised by Alan Cox , while hacking some * experimental NFS changes. Modularisation taken straight from SYS5 fs. * * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. * J.S.Peatfield@damtp.cam.ac.uk * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nfs4_fs.h" #include "callback.h" #include "delegation.h" #include "iostat.h" #define NFSDBG_FACILITY NFSDBG_VFS #define NFS_PARANOIA 1 /* Maximum number of readahead requests * FIXME: this should really be a sysctl so that users may tune it to suit * their needs. People that do NFS over a slow network, might for * instance want to reduce it to something closer to 1 for improved * interactive response. */ #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) static void nfs_invalidate_inode(struct inode *); static int nfs_update_inode(struct inode *, struct nfs_fattr *); static struct inode *nfs_alloc_inode(struct super_block *sb); static void nfs_destroy_inode(struct inode *); static int nfs_write_inode(struct inode *,int); static void nfs_delete_inode(struct inode *); static void nfs_clear_inode(struct inode *); static void nfs_umount_begin(struct super_block *); static int nfs_statfs(struct super_block *, struct kstatfs *); static int nfs_show_options(struct seq_file *, struct vfsmount *); static int nfs_show_stats(struct seq_file *, struct vfsmount *); static void nfs_zap_acl_cache(struct inode *); static struct rpc_program nfs_program; static struct super_operations nfs_sops = { .alloc_inode = nfs_alloc_inode, .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, .delete_inode = nfs_delete_inode, .statfs = nfs_statfs, .clear_inode = nfs_clear_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, .show_stats = nfs_show_stats, }; /* * RPC cruft for NFS */ static struct rpc_stat nfs_rpcstat = { .program = &nfs_program }; static struct rpc_version * nfs_version[] = { NULL, NULL, &nfs_version2, #if defined(CONFIG_NFS_V3) &nfs_version3, #elif defined(CONFIG_NFS_V4) NULL, #endif #if defined(CONFIG_NFS_V4) &nfs_version4, #endif }; static struct rpc_program nfs_program = { .name = "nfs", .number = NFS_PROGRAM, .nrvers = ARRAY_SIZE(nfs_version), .version = nfs_version, .stats = &nfs_rpcstat, .pipe_dir_name = "/nfs", }; #ifdef CONFIG_NFS_V3_ACL static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; static struct rpc_version * nfsacl_version[] = { [3] = &nfsacl_version3, }; struct rpc_program nfsacl_program = { .name = "nfsacl", .number = NFS_ACL_PROGRAM, .nrvers = ARRAY_SIZE(nfsacl_version), .version = nfsacl_version, .stats = &nfsacl_rpcstat, }; #endif /* CONFIG_NFS_V3_ACL */ static inline unsigned long nfs_fattr_to_ino_t(struct nfs_fattr *fattr) { return nfs_fileid_to_ino_t(fattr->fileid); } static int nfs_write_inode(struct inode *inode, int sync) { int flags = sync ? FLUSH_SYNC : 0; int ret; ret = nfs_commit_inode(inode, flags); if (ret < 0) return ret; return 0; } static void nfs_delete_inode(struct inode * inode) { dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); truncate_inode_pages(&inode->i_data, 0); nfs_wb_all(inode); /* * The following should never happen... */ if (nfs_have_writebacks(inode)) { printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino); } clear_inode(inode); } static void nfs_clear_inode(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); struct rpc_cred *cred; nfs_wb_all(inode); BUG_ON (!list_empty(&nfsi->open_files)); nfs_zap_acl_cache(inode); cred = nfsi->cache_access.cred; if (cred) put_rpccred(cred); BUG_ON(atomic_read(&nfsi->data_updates) != 0); } void nfs_umount_begin(struct super_block *sb) { struct rpc_clnt *rpc = NFS_SB(sb)->client; /* -EIO all pending I/O */ if (!IS_ERR(rpc)) rpc_killall_tasks(rpc); rpc = NFS_SB(sb)->client_acl; if (!IS_ERR(rpc)) rpc_killall_tasks(rpc); } static inline unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) { /* make sure blocksize is a power of two */ if ((bsize & (bsize - 1)) || nrbitsp) { unsigned char nrbits; for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) ; bsize = 1 << nrbits; if (nrbitsp) *nrbitsp = nrbits; } return bsize; } /* * Calculate the number of 512byte blocks used. */ static inline unsigned long nfs_calc_block_size(u64 tsize) { loff_t used = (tsize + 511) >> 9; return (used > ULONG_MAX) ? ULONG_MAX : used; } /* * Compute and set NFS server blocksize */ static inline unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) { if (bsize < NFS_MIN_FILE_IO_SIZE) bsize = NFS_DEF_FILE_IO_SIZE; else if (bsize >= NFS_MAX_FILE_IO_SIZE) bsize = NFS_MAX_FILE_IO_SIZE; return nfs_block_bits(bsize, nrbitsp); } /* * Obtain the root inode of the file system. */ static struct inode * nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) { struct nfs_server *server = NFS_SB(sb); int error; error = server->rpc_ops->getroot(server, rootfh, fsinfo); if (error < 0) { dprintk("nfs_get_root: getattr error = %d\n", -error); return ERR_PTR(error); } return nfs_fhget(sb, rootfh, fsinfo->fattr); } /* * Do NFS version-independent mount processing, and sanity checking */ static int nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor) { struct nfs_server *server; struct inode *root_inode; struct nfs_fattr fattr; struct nfs_fsinfo fsinfo = { .fattr = &fattr, }; struct nfs_pathconf pathinfo = { .fattr = &fattr, }; int no_root_error = 0; unsigned long max_rpc_payload; /* We probably want something more informative here */ snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); server = NFS_SB(sb); sb->s_magic = NFS_SUPER_MAGIC; server->io_stats = nfs_alloc_iostats(); if (server->io_stats == NULL) return -ENOMEM; root_inode = nfs_get_root(sb, &server->fh, &fsinfo); /* Did getting the root inode fail? */ if (IS_ERR(root_inode)) { no_root_error = PTR_ERR(root_inode); goto out_no_root; } sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) { no_root_error = -ENOMEM; goto out_no_root; } sb->s_root->d_op = server->rpc_ops->dentry_ops; /* mount time stamp, in seconds */ server->mount_time = jiffies; /* Get some general file system info */ if (server->namelen == 0 && server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0) server->namelen = pathinfo.max_namelen; /* Work out a lot of parameters */ if (server->rsize == 0) server->rsize = nfs_block_size(fsinfo.rtpref, NULL); if (server->wsize == 0) server->wsize = nfs_block_size(fsinfo.wtpref, NULL); if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax) server->rsize = nfs_block_size(fsinfo.rtmax, NULL); if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax) server->wsize = nfs_block_size(fsinfo.wtmax, NULL); max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); if (server->rsize > max_rpc_payload) server->rsize = max_rpc_payload; if (server->rsize > NFS_MAX_FILE_IO_SIZE) server->rsize = NFS_MAX_FILE_IO_SIZE; server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; if (server->wsize > max_rpc_payload) server->wsize = max_rpc_payload; if (server->wsize > NFS_MAX_FILE_IO_SIZE) server->wsize = NFS_MAX_FILE_IO_SIZE; server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; if (sb->s_blocksize == 0) sb->s_blocksize = nfs_block_bits(server->wsize, &sb->s_blocksize_bits); server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL); server->dtsize = nfs_block_size(fsinfo.dtpref, NULL); if (server->dtsize > PAGE_CACHE_SIZE) server->dtsize = PAGE_CACHE_SIZE; if (server->dtsize > server->rsize) server->dtsize = server->rsize; if (server->flags & NFS_MOUNT_NOAC) { server->acregmin = server->acregmax = 0; server->acdirmin = server->acdirmax = 0; sb->s_flags |= MS_SYNCHRONOUS; } server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; sb->s_maxbytes = fsinfo.maxfilesize; if (sb->s_maxbytes > MAX_LFS_FILESIZE) sb->s_maxbytes = MAX_LFS_FILESIZE; server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; /* We're airborne Set socket buffersize */ rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); return 0; /* Yargs. It didn't work out. */ out_no_root: dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error); if (!IS_ERR(root_inode)) iput(root_inode); return no_root_error; } static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans) { to->to_initval = timeo * HZ / 10; to->to_retries = retrans; if (!to->to_retries) to->to_retries = 2; switch (proto) { case IPPROTO_TCP: if (!to->to_initval) to->to_initval = 60 * HZ; if (to->to_initval > NFS_MAX_TCP_TIMEOUT) to->to_initval = NFS_MAX_TCP_TIMEOUT; to->to_increment = to->to_initval; to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); to->to_exponential = 0; break; case IPPROTO_UDP: default: if (!to->to_initval) to->to_initval = 11 * HZ / 10; if (to->to_initval > NFS_MAX_UDP_TIMEOUT) to->to_initval = NFS_MAX_UDP_TIMEOUT; to->to_maxval = NFS_MAX_UDP_TIMEOUT; to->to_exponential = 1; break; } } /* * Create an RPC client handle. */ static struct rpc_clnt * nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) { struct rpc_timeout timeparms; struct rpc_xprt *xprt = NULL; struct rpc_clnt *clnt = NULL; int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans); server->retrans_timeo = timeparms.to_initval; server->retrans_count = timeparms.to_retries; /* create transport and client */ xprt = xprt_create_proto(proto, &server->addr, &timeparms); if (IS_ERR(xprt)) { dprintk("%s: cannot create RPC transport. Error = %ld\n", __FUNCTION__, PTR_ERR(xprt)); return (struct rpc_clnt *)xprt; } clnt = rpc_create_client(xprt, server->hostname, &nfs_program, server->rpc_ops->version, data->pseudoflavor); if (IS_ERR(clnt)) { dprintk("%s: cannot create RPC client. Error = %ld\n", __FUNCTION__, PTR_ERR(xprt)); goto out_fail; } clnt->cl_intr = 1; clnt->cl_softrtry = 1; return clnt; out_fail: return clnt; } /* * The way this works is that the mount process passes a structure * in the data argument which contains the server's IP address * and the root file handle obtained from the server's mount * daemon. We stash these away in the private superblock fields. */ static int nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) { struct nfs_server *server; rpc_authflavor_t authflavor; server = NFS_SB(sb); sb->s_blocksize_bits = 0; sb->s_blocksize = 0; if (data->bsize) sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); if (data->rsize) server->rsize = nfs_block_size(data->rsize, NULL); if (data->wsize) server->wsize = nfs_block_size(data->wsize, NULL); server->flags = data->flags & NFS_MOUNT_FLAGMASK; server->acregmin = data->acregmin*HZ; server->acregmax = data->acregmax*HZ; server->acdirmin = data->acdirmin*HZ; server->acdirmax = data->acdirmax*HZ; /* Start lockd here, before we might error out */ if (!(server->flags & NFS_MOUNT_NONLM)) lockd_up(); server->namelen = data->namlen; server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL); if (!server->hostname) return -ENOMEM; strcpy(server->hostname, data->hostname); /* Check NFS protocol revision and initialize RPC op vector * and file handle pool. */ #ifdef CONFIG_NFS_V3 if (server->flags & NFS_MOUNT_VER3) { server->rpc_ops = &nfs_v3_clientops; server->caps |= NFS_CAP_READDIRPLUS; } else { server->rpc_ops = &nfs_v2_clientops; } #else server->rpc_ops = &nfs_v2_clientops; #endif /* Fill in pseudoflavor for mount version < 5 */ if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) data->pseudoflavor = RPC_AUTH_UNIX; authflavor = data->pseudoflavor; /* save for sb_init() */ /* XXX maybe we want to add a server->pseudoflavor field */ /* Create RPC client handles */ server->client = nfs_create_client(server, data); if (IS_ERR(server->client)) return PTR_ERR(server->client); /* RFC 2623, sec 2.3.2 */ if (authflavor != RPC_AUTH_UNIX) { struct rpc_auth *auth; server->client_sys = rpc_clone_client(server->client); if (IS_ERR(server->client_sys)) return PTR_ERR(server->client_sys); auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys); if (IS_ERR(auth)) return PTR_ERR(auth); } else { atomic_inc(&server->client->cl_count); server->client_sys = server->client; } if (server->flags & NFS_MOUNT_VER3) { #ifdef CONFIG_NFS_V3_ACL if (!(server->flags & NFS_MOUNT_NOACL)) { server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); /* No errors! Assume that Sun nfsacls are supported */ if (!IS_ERR(server->client_acl)) server->caps |= NFS_CAP_ACLS; } #else server->flags &= ~NFS_MOUNT_NOACL; #endif /* CONFIG_NFS_V3_ACL */ /* * The VFS shouldn't apply the umask to mode bits. We will * do so ourselves when necessary. */ sb->s_flags |= MS_POSIXACL; if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) server->namelen = NFS3_MAXNAMLEN; sb->s_time_gran = 1; } else { if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) server->namelen = NFS2_MAXNAMLEN; } sb->s_op = &nfs_sops; return nfs_sb_init(sb, authflavor); } static int nfs_statfs(struct super_block *sb, struct kstatfs *buf) { struct nfs_server *server = NFS_SB(sb); unsigned char blockbits; unsigned long blockres; struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode); struct nfs_fattr fattr; struct nfs_fsstat res = { .fattr = &fattr, }; int error; lock_kernel(); error = server->rpc_ops->statfs(server, rootfh, &res); buf->f_type = NFS_SUPER_MAGIC; if (error < 0) goto out_err; /* * Current versions of glibc do not correctly handle the * case where f_frsize != f_bsize. Eventually we want to * report the value of wtmult in this field. */ buf->f_frsize = sb->s_blocksize; /* * On most *nix systems, f_blocks, f_bfree, and f_bavail * are reported in units of f_frsize. Linux hasn't had * an f_frsize field in its statfs struct until recently, * thus historically Linux's sys_statfs reports these * fields in units of f_bsize. */ buf->f_bsize = sb->s_blocksize; blockbits = sb->s_blocksize_bits; blockres = (1 << blockbits) - 1; buf->f_blocks = (res.tbytes + blockres) >> blockbits; buf->f_bfree = (res.fbytes + blockres) >> blockbits; buf->f_bavail = (res.abytes + blockres) >> blockbits; buf->f_files = res.tfiles; buf->f_ffree = res.afiles; buf->f_namelen = server->namelen; out: unlock_kernel(); return 0; out_err: dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; goto out; } static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) { static struct proc_nfs_info { int flag; char *str; char *nostr; } nfs_info[] = { { NFS_MOUNT_SOFT, ",soft", ",hard" }, { NFS_MOUNT_INTR, ",intr", "" }, { NFS_MOUNT_NOCTO, ",nocto", "" }, { NFS_MOUNT_NOAC, ",noac", "" }, { NFS_MOUNT_NONLM, ",nolock", "" }, { NFS_MOUNT_NOACL, ",noacl", "" }, { 0, NULL, NULL } }; struct proc_nfs_info *nfs_infop; char buf[12]; char *proto; seq_printf(m, ",vers=%d", nfss->rpc_ops->version); seq_printf(m, ",rsize=%d", nfss->rsize); seq_printf(m, ",wsize=%d", nfss->wsize); if (nfss->acregmin != 3*HZ || showdefaults) seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); if (nfss->acregmax != 60*HZ || showdefaults) seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); if (nfss->acdirmin != 30*HZ || showdefaults) seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); if (nfss->acdirmax != 60*HZ || showdefaults) seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { if (nfss->flags & nfs_infop->flag) seq_puts(m, nfs_infop->str); else seq_puts(m, nfs_infop->nostr); } switch (nfss->client->cl_xprt->prot) { case IPPROTO_TCP: proto = "tcp"; break; case IPPROTO_UDP: proto = "udp"; break; default: snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot); proto = buf; } seq_printf(m, ",proto=%s", proto); seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ); seq_printf(m, ",retrans=%u", nfss->retrans_count); } static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) { struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); nfs_show_mount_options(m, nfss, 0); seq_puts(m, ",addr="); seq_escape(m, nfss->hostname, " \t\n\\"); return 0; } static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) { int i, cpu; struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); struct rpc_auth *auth = nfss->client->cl_auth; struct nfs_iostats totals = { }; seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); /* * Display all mount option settings */ seq_printf(m, "\n\topts:\t"); seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); nfs_show_mount_options(m, nfss, 1); seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); seq_printf(m, "\n\tcaps:\t"); seq_printf(m, "caps=0x%x", nfss->caps); seq_printf(m, ",wtmult=%d", nfss->wtmult); seq_printf(m, ",dtsize=%d", nfss->dtsize); seq_printf(m, ",bsize=%d", nfss->bsize); seq_printf(m, ",namelen=%d", nfss->namelen); #ifdef CONFIG_NFS_V4 if (nfss->rpc_ops->version == 4) { seq_printf(m, "\n\tnfsv4:\t"); seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); } #endif /* * Display security flavor in effect for this mount */ seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor); if (auth->au_flavor) seq_printf(m, ",pseudoflavor=%d", auth->au_flavor); /* * Display superblock I/O counters */ for_each_possible_cpu(cpu) { struct nfs_iostats *stats; preempt_disable(); stats = per_cpu_ptr(nfss->io_stats, cpu); for (i = 0; i < __NFSIOS_COUNTSMAX; i++) totals.events[i] += stats->events[i]; for (i = 0; i < __NFSIOS_BYTESMAX; i++) totals.bytes[i] += stats->bytes[i]; preempt_enable(); } seq_printf(m, "\n\tevents:\t"); for (i = 0; i < __NFSIOS_COUNTSMAX; i++) seq_printf(m, "%lu ", totals.events[i]); seq_printf(m, "\n\tbytes:\t"); for (i = 0; i < __NFSIOS_BYTESMAX; i++) seq_printf(m, "%Lu ", totals.bytes[i]); seq_printf(m, "\n"); rpc_print_iostats(m, nfss->client); return 0; } /** * nfs_sync_mapping - helper to flush all mmapped dirty data to disk */ int nfs_sync_mapping(struct address_space *mapping) { int ret; if (mapping->nrpages == 0) return 0; unmap_mapping_range(mapping, 0, 0, 0); ret = filemap_write_and_wait(mapping); if (ret != 0) goto out; ret = nfs_wb_all(mapping->host); out: return ret; } /* * Invalidate the local caches */ static void nfs_zap_caches_locked(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); int mode = inode->i_mode; nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); NFS_ATTRTIMEO_UPDATE(inode) = jiffies; memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; else nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; } void nfs_zap_caches(struct inode *inode) { spin_lock(&inode->i_lock); nfs_zap_caches_locked(inode); spin_unlock(&inode->i_lock); } static void nfs_zap_acl_cache(struct inode *inode) { void (*clear_acl_cache)(struct inode *); clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; if (clear_acl_cache != NULL) clear_acl_cache(inode); spin_lock(&inode->i_lock); NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; spin_unlock(&inode->i_lock); } /* * Invalidate, but do not unhash, the inode. * NB: must be called with inode->i_lock held! */ static void nfs_invalidate_inode(struct inode *inode) { set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); nfs_zap_caches_locked(inode); } struct nfs_find_desc { struct nfs_fh *fh; struct nfs_fattr *fattr; }; /* * In NFSv3 we can have 64bit inode numbers. In order to support * this, and re-exported directories (also seen in NFSv2) * we are forced to allow 2 different inodes to have the same * i_ino. */ static int nfs_find_actor(struct inode *inode, void *opaque) { struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; struct nfs_fh *fh = desc->fh; struct nfs_fattr *fattr = desc->fattr; if (NFS_FILEID(inode) != fattr->fileid) return 0; if (nfs_compare_fh(NFS_FH(inode), fh)) return 0; if (is_bad_inode(inode) || NFS_STALE(inode)) return 0; return 1; } static int nfs_init_locked(struct inode *inode, void *opaque) { struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; struct nfs_fattr *fattr = desc->fattr; NFS_FILEID(inode) = fattr->fileid; nfs_copy_fh(NFS_FH(inode), desc->fh); return 0; } /* Don't use READDIRPLUS on directories that we believe are too large */ #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) /* * This is our front-end to iget that looks up inodes by file handle * instead of inode number. */ struct inode * nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) { struct nfs_find_desc desc = { .fh = fh, .fattr = fattr }; struct inode *inode = ERR_PTR(-ENOENT); unsigned long hash; if ((fattr->valid & NFS_ATTR_FATTR) == 0) goto out_no_inode; if (!fattr->nlink) { printk("NFS: Buggy server - nlink == 0!\n"); goto out_no_inode; } hash = nfs_fattr_to_ino_t(fattr); inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); if (inode == NULL) { inode = ERR_PTR(-ENOMEM); goto out_no_inode; } if (inode->i_state & I_NEW) { struct nfs_inode *nfsi = NFS_I(inode); /* We set i_ino for the few things that still rely on it, * such as stat(2) */ inode->i_ino = hash; /* We can't support update_atime(), since the server will reset it */ inode->i_flags |= S_NOATIME|S_NOCMTIME; inode->i_mode = fattr->mode; /* Why so? Because we want revalidate for devices/FIFOs, and * that's precisely what we have in nfs_file_inode_operations. */ inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops; if (S_ISREG(inode->i_mode)) { inode->i_fop = &nfs_file_operations; inode->i_data.a_ops = &nfs_file_aops; inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops; inode->i_fop = &nfs_dir_operations; if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) && fattr->size <= NFS_LIMIT_READDIRPLUS) set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); } else if (S_ISLNK(inode->i_mode)) inode->i_op = &nfs_symlink_inode_operations; else init_special_inode(inode, inode->i_mode, fattr->rdev); nfsi->read_cache_jiffies = fattr->time_start; nfsi->last_updated = jiffies; inode->i_atime = fattr->atime; inode->i_mtime = fattr->mtime; inode->i_ctime = fattr->ctime; if (fattr->valid & NFS_ATTR_FATTR_V4) nfsi->change_attr = fattr->change_attr; inode->i_size = nfs_size_to_loff_t(fattr->size); inode->i_nlink = fattr->nlink; inode->i_uid = fattr->uid; inode->i_gid = fattr->gid; if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { /* * report the blocks in 512byte units */ inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); inode->i_blksize = inode->i_sb->s_blocksize; } else { inode->i_blocks = fattr->du.nfs2.blocks; inode->i_blksize = fattr->du.nfs2.blocksize; } nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); nfsi->attrtimeo_timestamp = jiffies; memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); nfsi->cache_access.cred = NULL; unlock_new_inode(inode); } else nfs_refresh_inode(inode, fattr); dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode), atomic_read(&inode->i_count)); out: return inode; out_no_inode: dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); goto out; } #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) int nfs_setattr(struct dentry *dentry, struct iattr *attr) { struct inode *inode = dentry->d_inode; struct nfs_fattr fattr; int error; nfs_inc_stats(inode, NFSIOS_VFSSETATTR); if (attr->ia_valid & ATTR_SIZE) { if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) attr->ia_valid &= ~ATTR_SIZE; } /* Optimization: if the end result is no change, don't RPC */ attr->ia_valid &= NFS_VALID_ATTRS; if (attr->ia_valid == 0) return 0; lock_kernel(); nfs_begin_data_update(inode); /* Write all dirty data */ filemap_write_and_wait(inode->i_mapping); nfs_wb_all(inode); /* * Return any delegations if we're going to change ACLs */ if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) nfs_inode_return_delegation(inode); error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); if (error == 0) nfs_refresh_inode(inode, &fattr); nfs_end_data_update(inode); unlock_kernel(); return error; } /** * nfs_setattr_update_inode - Update inode metadata after a setattr call. * @inode: pointer to struct inode * @attr: pointer to struct iattr * * Note: we do this in the *proc.c in order to ensure that * it works for things like exclusive creates too. */ void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) { if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { if ((attr->ia_valid & ATTR_MODE) != 0) { int mode = attr->ia_mode & S_IALLUGO; mode |= inode->i_mode & ~S_IALLUGO; inode->i_mode = mode; } if ((attr->ia_valid & ATTR_UID) != 0) inode->i_uid = attr->ia_uid; if ((attr->ia_valid & ATTR_GID) != 0) inode->i_gid = attr->ia_gid; spin_lock(&inode->i_lock); NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; spin_unlock(&inode->i_lock); } if ((attr->ia_valid & ATTR_SIZE) != 0) { nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); inode->i_size = attr->ia_size; vmtruncate(inode, attr->ia_size); } } static int nfs_wait_schedule(void *word) { if (signal_pending(current)) return -ERESTARTSYS; schedule(); return 0; } /* * Wait for the inode to get unlocked. */ static int nfs_wait_on_inode(struct inode *inode) { struct rpc_clnt *clnt = NFS_CLIENT(inode); struct nfs_inode *nfsi = NFS_I(inode); sigset_t oldmask; int error; rpc_clnt_sigmask(clnt, &oldmask); error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, nfs_wait_schedule, TASK_INTERRUPTIBLE); rpc_clnt_sigunmask(clnt, &oldmask); return error; } static void nfs_wake_up_inode(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); smp_mb__after_clear_bit(); wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); } int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = dentry->d_inode; int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; int err; /* Flush out writes to the server in order to update c/mtime */ nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT); /* * We may force a getattr if the user cares about atime. * * Note that we only have to check the vfsmount flags here: * - NFS always sets S_NOATIME by so checking it would give a * bogus result * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is * no point in checking those. */ if ((mnt->mnt_flags & MNT_NOATIME) || ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) need_atime = 0; if (need_atime) err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); else err = nfs_revalidate_inode(NFS_SERVER(inode), inode); if (!err) generic_fillattr(inode, stat); return err; } static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred) { struct nfs_open_context *ctx; ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL); if (ctx != NULL) { atomic_set(&ctx->count, 1); ctx->dentry = dget(dentry); ctx->vfsmnt = mntget(mnt); ctx->cred = get_rpccred(cred); ctx->state = NULL; ctx->lockowner = current->files; ctx->error = 0; ctx->dir_cookie = 0; } return ctx; } struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) { if (ctx != NULL) atomic_inc(&ctx->count); return ctx; } void put_nfs_open_context(struct nfs_open_context *ctx) { if (atomic_dec_and_test(&ctx->count)) { if (!list_empty(&ctx->list)) { struct inode *inode = ctx->dentry->d_inode; spin_lock(&inode->i_lock); list_del(&ctx->list); spin_unlock(&inode->i_lock); } if (ctx->state != NULL) nfs4_close_state(ctx->state, ctx->mode); if (ctx->cred != NULL) put_rpccred(ctx->cred); dput(ctx->dentry); mntput(ctx->vfsmnt); kfree(ctx); } } /* * Ensure that mmap has a recent RPC credential for use when writing out * shared pages */ static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) { struct inode *inode = filp->f_dentry->d_inode; struct nfs_inode *nfsi = NFS_I(inode); filp->private_data = get_nfs_open_context(ctx); spin_lock(&inode->i_lock); list_add(&ctx->list, &nfsi->open_files); spin_unlock(&inode->i_lock); } /* * Given an inode, search for an open context with the desired characteristics */ struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode) { struct nfs_inode *nfsi = NFS_I(inode); struct nfs_open_context *pos, *ctx = NULL; spin_lock(&inode->i_lock); list_for_each_entry(pos, &nfsi->open_files, list) { if (cred != NULL && pos->cred != cred) continue; if ((pos->mode & mode) == mode) { ctx = get_nfs_open_context(pos); break; } } spin_unlock(&inode->i_lock); return ctx; } static void nfs_file_clear_open_context(struct file *filp) { struct inode *inode = filp->f_dentry->d_inode; struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data; if (ctx) { filp->private_data = NULL; spin_lock(&inode->i_lock); list_move_tail(&ctx->list, &NFS_I(inode)->open_files); spin_unlock(&inode->i_lock); put_nfs_open_context(ctx); } } /* * These allocate and release file read/write context information. */ int nfs_open(struct inode *inode, struct file *filp) { struct nfs_open_context *ctx; struct rpc_cred *cred; cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); if (IS_ERR(cred)) return PTR_ERR(cred); ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred); put_rpccred(cred); if (ctx == NULL) return -ENOMEM; ctx->mode = filp->f_mode; nfs_file_set_open_context(filp, ctx); put_nfs_open_context(ctx); return 0; } int nfs_release(struct inode *inode, struct file *filp) { nfs_file_clear_open_context(filp); return 0; } /* * This function is called whenever some part of NFS notices that * the cached attributes have to be refreshed. */ int __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) { int status = -ESTALE; struct nfs_fattr fattr; struct nfs_inode *nfsi = NFS_I(inode); dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode)); lock_kernel(); if (!inode || is_bad_inode(inode)) goto out_nowait; if (NFS_STALE(inode)) goto out_nowait; status = nfs_wait_on_inode(inode); if (status < 0) goto out; if (NFS_STALE(inode)) { status = -ESTALE; /* Do we trust the cached ESTALE? */ if (NFS_ATTRTIMEO(inode) != 0) { if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) { /* no */ } else goto out; } } status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); if (status != 0) { dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode), status); if (status == -ESTALE) { nfs_zap_caches(inode); if (!S_ISDIR(inode->i_mode)) set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); } goto out; } spin_lock(&inode->i_lock); status = nfs_update_inode(inode, &fattr); if (status) { spin_unlock(&inode->i_lock); dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode), status); goto out; } spin_unlock(&inode->i_lock); nfs_revalidate_mapping(inode, inode->i_mapping); if (nfsi->cache_validity & NFS_INO_INVALID_ACL) nfs_zap_acl_cache(inode); dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode)); out: nfs_wake_up_inode(inode); out_nowait: unlock_kernel(); return status; } int nfs_attribute_timeout(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); if (nfs_have_delegation(inode, FMODE_READ)) return 0; return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo); } /** * nfs_revalidate_inode - Revalidate the inode attributes * @server - pointer to nfs_server struct * @inode - pointer to inode struct * * Updates inode attribute information by retrieving the data from the server. */ int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) { nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) && !nfs_attribute_timeout(inode)) return NFS_STALE(inode) ? -ESTALE : 0; return __nfs_revalidate_inode(server, inode); } /** * nfs_revalidate_mapping - Revalidate the pagecache * @inode - pointer to host inode * @mapping - pointer to mapping */ void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) { struct nfs_inode *nfsi = NFS_I(inode); if (nfsi->cache_validity & NFS_INO_INVALID_DATA) { nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); if (S_ISREG(inode->i_mode)) nfs_sync_mapping(mapping); invalidate_inode_pages2(mapping); spin_lock(&inode->i_lock); nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; if (S_ISDIR(inode->i_mode)) { memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); /* This ensures we revalidate child dentries */ nfsi->cache_change_attribute = jiffies; } spin_unlock(&inode->i_lock); dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode)); } } /** * nfs_begin_data_update * @inode - pointer to inode * Declare that a set of operations will update file data on the server */ void nfs_begin_data_update(struct inode *inode) { atomic_inc(&NFS_I(inode)->data_updates); } /** * nfs_end_data_update * @inode - pointer to inode * Declare end of the operations that will update file data * This will mark the inode as immediately needing revalidation * of its attribute cache. */ void nfs_end_data_update(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); if (!nfs_have_delegation(inode, FMODE_READ)) { /* Directories and symlinks: invalidate page cache */ if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) { spin_lock(&inode->i_lock); nfsi->cache_validity |= NFS_INO_INVALID_DATA; spin_unlock(&inode->i_lock); } } nfsi->cache_change_attribute = jiffies; atomic_dec(&nfsi->data_updates); } static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) { struct nfs_inode *nfsi = NFS_I(inode); /* If we have atomic WCC data, we may update some attributes */ if ((fattr->valid & NFS_ATTR_WCC) != 0) { if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); nfsi->cache_change_attribute = jiffies; } if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); nfsi->cache_change_attribute = jiffies; } if (inode->i_size == fattr->pre_size && nfsi->npages == 0) { inode->i_size = fattr->size; nfsi->cache_change_attribute = jiffies; } } } /** * nfs_check_inode_attributes - verify consistency of the inode attribute cache * @inode - pointer to inode * @fattr - updated attributes * * Verifies the attribute cache. If we have just changed the attributes, * so that fattr carries weak cache consistency data, then it may * also update the ctime/mtime/change_attribute. */ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) { struct nfs_inode *nfsi = NFS_I(inode); loff_t cur_size, new_isize; int data_unstable; /* Has the inode gone and changed behind our back? */ if (nfsi->fileid != fattr->fileid || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { return -EIO; } /* Are we in the process of updating data on the server? */ data_unstable = nfs_caches_unstable(inode); /* Do atomic weak cache consistency updates */ nfs_wcc_update_inode(inode, fattr); if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && nfsi->change_attr != fattr->change_attr) { nfsi->cache_validity |= NFS_INO_INVALID_ATTR; if (!data_unstable) nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; } /* Verify a few of the more important attributes */ if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { nfsi->cache_validity |= NFS_INO_INVALID_ATTR; if (!data_unstable) nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE; } cur_size = i_size_read(inode); new_isize = nfs_size_to_loff_t(fattr->size); if (cur_size != new_isize && nfsi->npages == 0) nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; /* Have any file permissions changed? */ if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || inode->i_uid != fattr->uid || inode->i_gid != fattr->gid) nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; /* Has the link count changed? */ if (inode->i_nlink != fattr->nlink) nfsi->cache_validity |= NFS_INO_INVALID_ATTR; if (!timespec_equal(&inode->i_atime, &fattr->atime)) nfsi->cache_validity |= NFS_INO_INVALID_ATIME; nfsi->read_cache_jiffies = fattr->time_start; return 0; } /** * nfs_refresh_inode - try to update the inode attribute cache * @inode - pointer to inode * @fattr - updated attributes * * Check that an RPC call that returned attributes has not overlapped with * other recent updates of the inode metadata, then decide whether it is * safe to do a full update of the inode attributes, or whether just to * call nfs_check_inode_attributes. */ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) { struct nfs_inode *nfsi = NFS_I(inode); int status; if ((fattr->valid & NFS_ATTR_FATTR) == 0) return 0; spin_lock(&inode->i_lock); nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; if (time_after(fattr->time_start, nfsi->last_updated)) status = nfs_update_inode(inode, fattr); else status = nfs_check_inode_attributes(inode, fattr); spin_unlock(&inode->i_lock); return status; } /** * nfs_post_op_update_inode - try to update the inode attribute cache * @inode - pointer to inode * @fattr - updated attributes * * After an operation that has changed the inode metadata, mark the * attribute cache as being invalid, then try to update it. */ int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) { struct nfs_inode *nfsi = NFS_I(inode); int status = 0; spin_lock(&inode->i_lock); if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) { nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS; goto out; } status = nfs_update_inode(inode, fattr); out: spin_unlock(&inode->i_lock); return status; } /* * Many nfs protocol calls return the new file attributes after * an operation. Here we update the inode to reflect the state * of the server's inode. * * This is a bit tricky because we have to make sure all dirty pages * have been sent off to the server before calling invalidate_inode_pages. * To make sure no other process adds more write requests while we try * our best to flush them, we make them sleep during the attribute refresh. * * A very similar scenario holds for the dir cache. */ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) { struct nfs_inode *nfsi = NFS_I(inode); loff_t cur_isize, new_isize; unsigned int invalid = 0; int data_stable; dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", __FUNCTION__, inode->i_sb->s_id, inode->i_ino, atomic_read(&inode->i_count), fattr->valid); if (nfsi->fileid != fattr->fileid) goto out_fileid; /* * Make sure the inode's type hasn't changed. */ if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) goto out_changed; /* * Update the read time so we don't revalidate too often. */ nfsi->read_cache_jiffies = fattr->time_start; nfsi->last_updated = jiffies; /* Are we racing with known updates of the metadata on the server? */ data_stable = nfs_verify_change_attribute(inode, fattr->time_start); if (data_stable) nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME); /* Do atomic weak cache consistency updates */ nfs_wcc_update_inode(inode, fattr); /* Check if our cached file size is stale */ new_isize = nfs_size_to_loff_t(fattr->size); cur_isize = i_size_read(inode); if (new_isize != cur_isize) { /* Do we perhaps have any outstanding writes? */ if (nfsi->npages == 0) { /* No, but did we race with nfs_end_data_update()? */ if (data_stable) { inode->i_size = new_isize; invalid |= NFS_INO_INVALID_DATA; } invalid |= NFS_INO_INVALID_ATTR; } else if (new_isize > cur_isize) { inode->i_size = new_isize; invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; } nfsi->cache_change_attribute = jiffies; dprintk("NFS: isize change on server for file %s/%ld\n", inode->i_sb->s_id, inode->i_ino); } /* Check if the mtime agrees */ if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); dprintk("NFS: mtime change on server for file %s/%ld\n", inode->i_sb->s_id, inode->i_ino); invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; nfsi->cache_change_attribute = jiffies; } /* If ctime has changed we should definitely clear access+acl caches */ if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); nfsi->cache_change_attribute = jiffies; } memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || inode->i_uid != fattr->uid || inode->i_gid != fattr->gid) invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; inode->i_mode = fattr->mode; inode->i_nlink = fattr->nlink; inode->i_uid = fattr->uid; inode->i_gid = fattr->gid; if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { /* * report the blocks in 512byte units */ inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); inode->i_blksize = inode->i_sb->s_blocksize; } else { inode->i_blocks = fattr->du.nfs2.blocks; inode->i_blksize = fattr->du.nfs2.blocksize; } if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && nfsi->change_attr != fattr->change_attr) { dprintk("NFS: change_attr change on server for file %s/%ld\n", inode->i_sb->s_id, inode->i_ino); nfsi->change_attr = fattr->change_attr; invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; nfsi->cache_change_attribute = jiffies; } /* Update attrtimeo value if we're out of the unstable period */ if (invalid & NFS_INO_INVALID_ATTR) { nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); nfsi->attrtimeo_timestamp = jiffies; } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) { if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); nfsi->attrtimeo_timestamp = jiffies; } /* Don't invalidate the data if we were to blame */ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) invalid &= ~NFS_INO_INVALID_DATA; if (data_stable) invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE); if (!nfs_have_delegation(inode, FMODE_READ)) nfsi->cache_validity |= invalid; return 0; out_changed: /* * Big trouble! The inode has become a different object. */ #ifdef NFS_PARANOIA printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); #endif out_err: /* * No need to worry about unhashing the dentry, as the * lookup validation will know that the inode is bad. * (But we fall through to invalidate the caches.) */ nfs_invalidate_inode(inode); return -ESTALE; out_fileid: printk(KERN_ERR "NFS: server %s error: fileid changed\n" "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", NFS_SERVER(inode)->hostname, inode->i_sb->s_id, (long long)nfsi->fileid, (long long)fattr->fileid); goto out_err; } /* * File system information */ static int nfs_set_super(struct super_block *s, void *data) { s->s_fs_info = data; return set_anon_super(s, data); } static int nfs_compare_super(struct super_block *sb, void *data) { struct nfs_server *server = data; struct nfs_server *old = NFS_SB(sb); if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) return 0; if (old->addr.sin_port != server->addr.sin_port) return 0; return !nfs_compare_fh(&old->fh, &server->fh); } static struct super_block *nfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data) { int error; struct nfs_server *server = NULL; struct super_block *s; struct nfs_fh *root; struct nfs_mount_data *data = raw_data; s = ERR_PTR(-EINVAL); if (data == NULL) { dprintk("%s: missing data argument\n", __FUNCTION__); goto out_err; } if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { dprintk("%s: bad mount version\n", __FUNCTION__); goto out_err; } switch (data->version) { case 1: data->namlen = 0; case 2: data->bsize = 0; case 3: if (data->flags & NFS_MOUNT_VER3) { dprintk("%s: mount structure version %d does not support NFSv3\n", __FUNCTION__, data->version); goto out_err; } data->root.size = NFS2_FHSIZE; memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); case 4: if (data->flags & NFS_MOUNT_SECFLAVOUR) { dprintk("%s: mount structure version %d does not support strong security\n", __FUNCTION__, data->version); goto out_err; } case 5: memset(data->context, 0, sizeof(data->context)); } #ifndef CONFIG_NFS_V3 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ s = ERR_PTR(-EPROTONOSUPPORT); if (data->flags & NFS_MOUNT_VER3) { dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); goto out_err; } #endif /* CONFIG_NFS_V3 */ s = ERR_PTR(-ENOMEM); server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); if (!server) goto out_err; /* Zero out the NFS state stuff */ init_nfsv4_state(server); server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); root = &server->fh; if (data->flags & NFS_MOUNT_VER3) root->size = data->root.size; else root->size = NFS2_FHSIZE; s = ERR_PTR(-EINVAL); if (root->size > sizeof(root->data)) { dprintk("%s: invalid root filehandle\n", __FUNCTION__); goto out_err; } memcpy(root->data, data->root.data, root->size); /* We now require that the mount process passes the remote address */ memcpy(&server->addr, &data->addr, sizeof(server->addr)); if (server->addr.sin_addr.s_addr == INADDR_ANY) { dprintk("%s: mount program didn't pass remote address!\n", __FUNCTION__); goto out_err; } /* Fire up rpciod if not yet running */ s = ERR_PTR(rpciod_up()); if (IS_ERR(s)) { dprintk("%s: couldn't start rpciod! Error = %ld\n", __FUNCTION__, PTR_ERR(s)); goto out_err; } s = sget(fs_type, nfs_compare_super, nfs_set_super, server); if (IS_ERR(s) || s->s_root) goto out_rpciod_down; s->s_flags = flags; error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); if (error) { up_write(&s->s_umount); deactivate_super(s); return ERR_PTR(error); } s->s_flags |= MS_ACTIVE; return s; out_rpciod_down: rpciod_down(); out_err: kfree(server); return s; } static void nfs_kill_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); kill_anon_super(s); if (!IS_ERR(server->client)) rpc_shutdown_client(server->client); if (!IS_ERR(server->client_sys)) rpc_shutdown_client(server->client_sys); if (!IS_ERR(server->client_acl)) rpc_shutdown_client(server->client_acl); if (!(server->flags & NFS_MOUNT_NONLM)) lockd_down(); /* release rpc.lockd */ rpciod_down(); /* release rpciod */ nfs_free_iostats(server->io_stats); kfree(server->hostname); kfree(server); } static struct file_system_type nfs_fs_type = { .owner = THIS_MODULE, .name = "nfs", .get_sb = nfs_get_sb, .kill_sb = nfs_kill_super, .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; #ifdef CONFIG_NFS_V4 static void nfs4_clear_inode(struct inode *); static struct super_operations nfs4_sops = { .alloc_inode = nfs_alloc_inode, .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, .delete_inode = nfs_delete_inode, .statfs = nfs_statfs, .clear_inode = nfs4_clear_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, .show_stats = nfs_show_stats, }; /* * Clean out any remaining NFSv4 state that might be left over due * to open() calls that passed nfs_atomic_lookup, but failed to call * nfs_open(). */ static void nfs4_clear_inode(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); /* If we are holding a delegation, return it! */ nfs_inode_return_delegation(inode); /* First call standard NFS clear_inode() code */ nfs_clear_inode(inode); /* Now clear out any remaining state */ while (!list_empty(&nfsi->open_states)) { struct nfs4_state *state; state = list_entry(nfsi->open_states.next, struct nfs4_state, inode_states); dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n", __FUNCTION__, inode->i_sb->s_id, (long long)NFS_FILEID(inode), state); BUG_ON(atomic_read(&state->count) != 1); nfs4_close_state(state, state->state); } } static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) { struct nfs_server *server; struct nfs4_client *clp = NULL; struct rpc_xprt *xprt = NULL; struct rpc_clnt *clnt = NULL; struct rpc_timeout timeparms; rpc_authflavor_t authflavour; int err = -EIO; sb->s_blocksize_bits = 0; sb->s_blocksize = 0; server = NFS_SB(sb); if (data->rsize != 0) server->rsize = nfs_block_size(data->rsize, NULL); if (data->wsize != 0) server->wsize = nfs_block_size(data->wsize, NULL); server->flags = data->flags & NFS_MOUNT_FLAGMASK; server->caps = NFS_CAP_ATOMIC_OPEN; server->acregmin = data->acregmin*HZ; server->acregmax = data->acregmax*HZ; server->acdirmin = data->acdirmin*HZ; server->acdirmax = data->acdirmax*HZ; server->rpc_ops = &nfs_v4_clientops; nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans); server->retrans_timeo = timeparms.to_initval; server->retrans_count = timeparms.to_retries; clp = nfs4_get_client(&server->addr.sin_addr); if (!clp) { dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); return -EIO; } /* Now create transport and client */ authflavour = RPC_AUTH_UNIX; if (data->auth_flavourlen != 0) { if (data->auth_flavourlen != 1) { dprintk("%s: Invalid number of RPC auth flavours %d.\n", __FUNCTION__, data->auth_flavourlen); err = -EINVAL; goto out_fail; } if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { err = -EFAULT; goto out_fail; } } down_write(&clp->cl_sem); if (IS_ERR(clp->cl_rpcclient)) { xprt = xprt_create_proto(data->proto, &server->addr, &timeparms); if (IS_ERR(xprt)) { up_write(&clp->cl_sem); err = PTR_ERR(xprt); dprintk("%s: cannot create RPC transport. Error = %d\n", __FUNCTION__, err); goto out_fail; } clnt = rpc_create_client(xprt, server->hostname, &nfs_program, server->rpc_ops->version, authflavour); if (IS_ERR(clnt)) { up_write(&clp->cl_sem); err = PTR_ERR(clnt); dprintk("%s: cannot create RPC client. Error = %d\n", __FUNCTION__, err); goto out_fail; } clnt->cl_intr = 1; clnt->cl_softrtry = 1; clp->cl_rpcclient = clnt; memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); nfs_idmap_new(clp); } list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); clnt = rpc_clone_client(clp->cl_rpcclient); if (!IS_ERR(clnt)) server->nfs4_state = clp; up_write(&clp->cl_sem); clp = NULL; if (IS_ERR(clnt)) { err = PTR_ERR(clnt); dprintk("%s: cannot create RPC client. Error = %d\n", __FUNCTION__, err); return err; } server->client = clnt; if (server->nfs4_state->cl_idmap == NULL) { dprintk("%s: failed to create idmapper.\n", __FUNCTION__); return -ENOMEM; } if (clnt->cl_auth->au_flavor != authflavour) { struct rpc_auth *auth; auth = rpcauth_create(authflavour, clnt); if (IS_ERR(auth)) { dprintk("%s: couldn't create credcache!\n", __FUNCTION__); return PTR_ERR(auth); } } sb->s_time_gran = 1; sb->s_op = &nfs4_sops; err = nfs_sb_init(sb, authflavour); if (err == 0) return 0; out_fail: if (clp) nfs4_put_client(clp); return err; } static int nfs4_compare_super(struct super_block *sb, void *data) { struct nfs_server *server = data; struct nfs_server *old = NFS_SB(sb); if (strcmp(server->hostname, old->hostname) != 0) return 0; if (strcmp(server->mnt_path, old->mnt_path) != 0) return 0; return 1; } static void * nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) { void *p = NULL; if (!src->len) return ERR_PTR(-EINVAL); if (src->len < maxlen) maxlen = src->len; if (dst == NULL) { p = dst = kmalloc(maxlen + 1, GFP_KERNEL); if (p == NULL) return ERR_PTR(-ENOMEM); } if (copy_from_user(dst, src->data, maxlen)) { kfree(p); return ERR_PTR(-EFAULT); } dst[maxlen] = '\0'; return dst; } static struct super_block *nfs4_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data) { int error; struct nfs_server *server; struct super_block *s; struct nfs4_mount_data *data = raw_data; void *p; if (data == NULL) { dprintk("%s: missing data argument\n", __FUNCTION__); return ERR_PTR(-EINVAL); } if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { dprintk("%s: bad mount version\n", __FUNCTION__); return ERR_PTR(-EINVAL); } server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); if (!server) return ERR_PTR(-ENOMEM); /* Zero out the NFS state stuff */ init_nfsv4_state(server); server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); p = nfs_copy_user_string(NULL, &data->hostname, 256); if (IS_ERR(p)) goto out_err; server->hostname = p; p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); if (IS_ERR(p)) goto out_err; server->mnt_path = p; p = nfs_copy_user_string(server->ip_addr, &data->client_addr, sizeof(server->ip_addr) - 1); if (IS_ERR(p)) goto out_err; /* We now require that the mount process passes the remote address */ if (data->host_addrlen != sizeof(server->addr)) { s = ERR_PTR(-EINVAL); goto out_free; } if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { s = ERR_PTR(-EFAULT); goto out_free; } if (server->addr.sin_family != AF_INET || server->addr.sin_addr.s_addr == INADDR_ANY) { dprintk("%s: mount program didn't pass remote IP address!\n", __FUNCTION__); s = ERR_PTR(-EINVAL); goto out_free; } /* Fire up rpciod if not yet running */ s = ERR_PTR(rpciod_up()); if (IS_ERR(s)) { dprintk("%s: couldn't start rpciod! Error = %ld\n", __FUNCTION__, PTR_ERR(s)); goto out_free; } s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); if (IS_ERR(s) || s->s_root) goto out_free; s->s_flags = flags; error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0); if (error) { up_write(&s->s_umount); deactivate_super(s); return ERR_PTR(error); } s->s_flags |= MS_ACTIVE; return s; out_err: s = (struct super_block *)p; out_free: kfree(server->mnt_path); kfree(server->hostname); kfree(server); return s; } static void nfs4_kill_super(struct super_block *sb) { struct nfs_server *server = NFS_SB(sb); nfs_return_all_delegations(sb); kill_anon_super(sb); nfs4_renewd_prepare_shutdown(server); if (server->client != NULL && !IS_ERR(server->client)) rpc_shutdown_client(server->client); destroy_nfsv4_state(server); rpciod_down(); nfs_free_iostats(server->io_stats); kfree(server->hostname); kfree(server); } static struct file_system_type nfs4_fs_type = { .owner = THIS_MODULE, .name = "nfs4", .get_sb = nfs4_get_sb, .kill_sb = nfs4_kill_super, .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; static const int nfs_set_port_min = 0; static const int nfs_set_port_max = 65535; static int param_set_port(const char *val, struct kernel_param *kp) { char *endp; int num = simple_strtol(val, &endp, 0); if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max) return -EINVAL; *((int *)kp->arg) = num; return 0; } module_param_call(callback_tcpport, param_set_port, param_get_int, &nfs_callback_set_tcpport, 0644); static int param_set_idmap_timeout(const char *val, struct kernel_param *kp) { char *endp; int num = simple_strtol(val, &endp, 0); int jif = num * HZ; if (endp == val || *endp || num < 0 || jif < num) return -EINVAL; *((int *)kp->arg) = jif; return 0; } module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int, &nfs_idmap_cache_timeout, 0644); #define nfs4_init_once(nfsi) \ do { \ INIT_LIST_HEAD(&(nfsi)->open_states); \ nfsi->delegation = NULL; \ nfsi->delegation_state = 0; \ init_rwsem(&nfsi->rwsem); \ } while(0) static inline int register_nfs4fs(void) { int ret; ret = nfs_register_sysctl(); if (ret != 0) return ret; ret = register_filesystem(&nfs4_fs_type); if (ret != 0) nfs_unregister_sysctl(); return ret; } static inline void unregister_nfs4fs(void) { unregister_filesystem(&nfs4_fs_type); nfs_unregister_sysctl(); } #else #define nfs4_init_once(nfsi) \ do { } while (0) #define register_nfs4fs() (0) #define unregister_nfs4fs() #endif extern int nfs_init_nfspagecache(void); extern void nfs_destroy_nfspagecache(void); extern int nfs_init_readpagecache(void); extern void nfs_destroy_readpagecache(void); extern int nfs_init_writepagecache(void); extern void nfs_destroy_writepagecache(void); #ifdef CONFIG_NFS_DIRECTIO extern int nfs_init_directcache(void); extern void nfs_destroy_directcache(void); #endif static kmem_cache_t * nfs_inode_cachep; static struct inode *nfs_alloc_inode(struct super_block *sb) { struct nfs_inode *nfsi; nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL); if (!nfsi) return NULL; nfsi->flags = 0UL; nfsi->cache_validity = 0UL; nfsi->cache_change_attribute = jiffies; #ifdef CONFIG_NFS_V3_ACL nfsi->acl_access = ERR_PTR(-EAGAIN); nfsi->acl_default = ERR_PTR(-EAGAIN); #endif #ifdef CONFIG_NFS_V4 nfsi->nfs4_acl = NULL; #endif /* CONFIG_NFS_V4 */ return &nfsi->vfs_inode; } static void nfs_destroy_inode(struct inode *inode) { kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); } static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) { struct nfs_inode *nfsi = (struct nfs_inode *) foo; if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) { inode_init_once(&nfsi->vfs_inode); spin_lock_init(&nfsi->req_lock); INIT_LIST_HEAD(&nfsi->dirty); INIT_LIST_HEAD(&nfsi->commit); INIT_LIST_HEAD(&nfsi->open_files); INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); atomic_set(&nfsi->data_updates, 0); nfsi->ndirty = 0; nfsi->ncommit = 0; nfsi->npages = 0; nfs4_init_once(nfsi); } } static int nfs_init_inodecache(void) { nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", sizeof(struct nfs_inode), 0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), init_once, NULL); if (nfs_inode_cachep == NULL) return -ENOMEM; return 0; } static void nfs_destroy_inodecache(void) { if (kmem_cache_destroy(nfs_inode_cachep)) printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n"); } /* * Initialize NFS */ static int __init init_nfs_fs(void) { int err; err = nfs_init_nfspagecache(); if (err) goto out4; err = nfs_init_inodecache(); if (err) goto out3; err = nfs_init_readpagecache(); if (err) goto out2; err = nfs_init_writepagecache(); if (err) goto out1; #ifdef CONFIG_NFS_DIRECTIO err = nfs_init_directcache(); if (err) goto out0; #endif #ifdef CONFIG_PROC_FS rpc_proc_register(&nfs_rpcstat); #endif err = register_filesystem(&nfs_fs_type); if (err) goto out; if ((err = register_nfs4fs()) != 0) goto out; return 0; out: #ifdef CONFIG_PROC_FS rpc_proc_unregister("nfs"); #endif #ifdef CONFIG_NFS_DIRECTIO nfs_destroy_directcache(); out0: #endif nfs_destroy_writepagecache(); out1: nfs_destroy_readpagecache(); out2: nfs_destroy_inodecache(); out3: nfs_destroy_nfspagecache(); out4: return err; } static void __exit exit_nfs_fs(void) { #ifdef CONFIG_NFS_DIRECTIO nfs_destroy_directcache(); #endif nfs_destroy_writepagecache(); nfs_destroy_readpagecache(); nfs_destroy_inodecache(); nfs_destroy_nfspagecache(); #ifdef CONFIG_PROC_FS rpc_proc_unregister("nfs"); #endif unregister_filesystem(&nfs_fs_type); unregister_nfs4fs(); } /* Not quite true; I just maintain it */ MODULE_AUTHOR("Olaf Kirch "); MODULE_LICENSE("GPL"); module_init(init_nfs_fs) module_exit(exit_nfs_fs)