/* * 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 "delegation.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 *, unsigned long); 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 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, }; /* * 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 = sizeof(nfs_version) / sizeof(nfs_version[0]), .version = nfs_version, .stats = &nfs_rpcstat, .pipe_dir_name = "/nfs", }; 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_WAIT : 0; int ret; ret = nfs_commit_inode(inode, 0, 0, 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); 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); } /* * For the moment, the only task for the NFS clear_inode method is to * release the mmap credential */ 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)); 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 nfs_server *server = NFS_SB(sb); struct rpc_clnt *rpc; /* -EIO all pending I/O */ if ((rpc = server->client) != NULL) 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 < 1024) bsize = NFS_DEF_FILE_IO_BUFFER_SIZE; else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE) bsize = NFS_MAX_FILE_IO_BUFFER_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); struct inode *rooti; 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); } rooti = nfs_fhget(sb, rootfh, fsinfo->fattr); if (!rooti) return ERR_PTR(-ENOMEM); return rooti; } /* * 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; 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; /* 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->wsize > max_rpc_payload) server->wsize = max_rpc_payload; server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; if (server->rpages > NFS_READ_MAXIOV) { server->rpages = NFS_READ_MAXIOV; server->rsize = server->rpages << PAGE_CACHE_SHIFT; } server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; if (server->wpages > NFS_WRITE_MAXIOV) { server->wpages = NFS_WRITE_MAXIOV; server->wsize = server->wpages << 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; } /* * 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 tcp = (data->flags & NFS_MOUNT_TCP); /* Initialize timeout values */ timeparms.to_initval = data->timeo * HZ / 10; timeparms.to_retries = data->retrans; timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT; timeparms.to_exponential = 1; if (!timeparms.to_initval) timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10; if (!timeparms.to_retries) timeparms.to_retries = 5; /* create transport and client */ xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP, &server->addr, &timeparms); if (IS_ERR(xprt)) { printk(KERN_WARNING "NFS: cannot create RPC transport.\n"); return (struct rpc_clnt *)xprt; } clnt = rpc_create_client(xprt, server->hostname, &nfs_program, server->rpc_ops->version, data->pseudoflavor); if (IS_ERR(clnt)) { printk(KERN_WARNING "NFS: cannot create RPC client.\n"); goto out_fail; } clnt->cl_intr = 1; clnt->cl_softrtry = 1; clnt->cl_chatty = 1; return clnt; out_fail: xprt_destroy(xprt); 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. */ if (server->flags & NFS_MOUNT_VER3) { #ifdef CONFIG_NFS_V3 server->rpc_ops = &nfs_v3_clientops; server->caps |= NFS_CAP_READDIRPLUS; if (data->version < 4) { printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n"); return -EIO; } #else printk(KERN_NOTICE "NFS: NFSv3 not supported.\n"); return -EIO; #endif } else { server->rpc_ops = &nfs_v2_clientops; } /* 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) { server->client_sys = rpc_clone_client(server->client); if (IS_ERR(server->client_sys)) return PTR_ERR(server->client_sys); if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys)) return -ENOMEM; } else { atomic_inc(&server->client->cl_count); server->client_sys = server->client; } if (server->flags & NFS_MOUNT_VER3) { 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: printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error); buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; goto out; } static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) { static struct proc_nfs_info { int flag; char *str; char *nostr; } nfs_info[] = { { NFS_MOUNT_SOFT, ",soft", ",hard" }, { NFS_MOUNT_INTR, ",intr", "" }, { NFS_MOUNT_POSIX, ",posix", "" }, { NFS_MOUNT_TCP, ",tcp", ",udp" }, { NFS_MOUNT_NOCTO, ",nocto", "" }, { NFS_MOUNT_NOAC, ",noac", "" }, { NFS_MOUNT_NONLM, ",nolock", ",lock" }, { 0, NULL, NULL } }; struct proc_nfs_info *nfs_infop; struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); seq_printf(m, ",v%d", nfss->rpc_ops->version); seq_printf(m, ",rsize=%d", nfss->rsize); seq_printf(m, ",wsize=%d", nfss->wsize); if (nfss->acregmin != 3*HZ) seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); if (nfss->acregmax != 60*HZ) seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); if (nfss->acdirmin != 30*HZ) seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); if (nfss->acdirmax != 60*HZ) 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); } seq_puts(m, ",addr="); seq_escape(m, nfss->hostname, " \t\n\\"); return 0; } /* * Invalidate the local caches */ void nfs_zap_caches(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); int mode = inode->i_mode; 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->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS; else nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS; } /* * Invalidate, but do not unhash, the inode */ static void nfs_invalidate_inode(struct inode *inode) { umode_t save_mode = inode->i_mode; make_bad_inode(inode); inode->i_mode = save_mode; nfs_zap_caches(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 = NULL; 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); if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc))) 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_file_inode_operations; 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) NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS; } 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->timestamp; 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: printk("nfs_fhget: iget failed\n"); 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; 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 if we're changing file permissions or size */ if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) { if (filemap_fdatawrite(inode->i_mapping) == 0) filemap_fdatawait(inode->i_mapping); nfs_wb_all(inode); } error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); if (error == 0) { nfs_refresh_inode(inode, &fattr); if ((attr->ia_valid & ATTR_MODE) != 0) { int mode; mode = inode->i_mode & ~S_IALLUGO; mode |= attr->ia_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; if ((attr->ia_valid & ATTR_SIZE) != 0) { inode->i_size = attr->ia_size; vmtruncate(inode, attr->ia_size); } } if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS; nfs_end_data_update(inode); unlock_kernel(); return error; } /* * Wait for the inode to get unlocked. * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING). */ static int nfs_wait_on_inode(struct inode *inode, int flag) { struct rpc_clnt *clnt = NFS_CLIENT(inode); struct nfs_inode *nfsi = NFS_I(inode); int error; if (!(NFS_FLAGS(inode) & flag)) return 0; atomic_inc(&inode->i_count); error = nfs_wait_event(clnt, nfsi->nfs_i_wait, !(NFS_FLAGS(inode) & flag)); iput(inode); return error; } int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = dentry->d_inode; struct nfs_inode *nfsi = NFS_I(inode); int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME; int err; if (__IS_FLG(inode, MS_NOATIME)) need_atime = 0; else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode)) need_atime = 0; /* We may force a getattr if the user cares about atime */ 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; } struct nfs_open_context *alloc_nfs_open_context(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->cred = get_rpccred(cred); ctx->state = NULL; ctx->lockowner = current->files; ctx->error = 0; init_waitqueue_head(&ctx->waitq); } 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); kfree(ctx); } } /* * Ensure that mmap has a recent RPC credential for use when writing out * shared pages */ 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); } struct nfs_open_context *nfs_find_open_context(struct inode *inode, 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 ((pos->mode & mode) == mode) { ctx = get_nfs_open_context(pos); break; } } spin_unlock(&inode->i_lock); return ctx; } 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_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); if ((filp->f_mode & FMODE_WRITE) != 0) nfs_begin_data_update(inode); return 0; } int nfs_release(struct inode *inode, struct file *filp) { if ((filp->f_mode & FMODE_WRITE) != 0) nfs_end_data_update(inode); 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); unsigned long verifier; unsigned int flags; 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; while (NFS_REVALIDATING(inode)) { status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING); if (status < 0) goto out_nowait; if (NFS_ATTRTIMEO(inode) == 0) continue; if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) continue; status = NFS_STALE(inode) ? -ESTALE : 0; goto out_nowait; } NFS_FLAGS(inode) |= NFS_INO_REVALIDATING; /* Protect against RPC races by saving the change attribute */ verifier = nfs_save_change_attribute(inode); 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)) NFS_FLAGS(inode) |= NFS_INO_STALE; } goto out; } status = nfs_update_inode(inode, &fattr, verifier); if (status) { 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; } flags = nfsi->flags; /* * We may need to keep the attributes marked as invalid if * we raced with nfs_end_attr_update(). */ if (verifier == nfsi->cache_change_attribute) nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME); /* Do the page cache invalidation */ if (flags & NFS_INO_INVALID_DATA) { if (S_ISREG(inode->i_mode)) { if (filemap_fdatawrite(inode->i_mapping) == 0) filemap_fdatawait(inode->i_mapping); nfs_wb_all(inode); } nfsi->flags &= ~NFS_INO_INVALID_DATA; invalidate_inode_pages2(inode->i_mapping); memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode)); /* This ensures we revalidate dentries */ nfsi->cache_change_attribute++; } dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", inode->i_sb->s_id, (long long)NFS_FILEID(inode)); out: NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING; wake_up(&nfsi->nfs_i_wait); 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) { if (!(NFS_FLAGS(inode) & (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_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)) { /* Mark the attribute cache for revalidation */ nfsi->flags |= NFS_INO_INVALID_ATTR; /* Directories and symlinks: invalidate page cache too */ if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) nfsi->flags |= NFS_INO_INVALID_DATA; } nfsi->cache_change_attribute ++; atomic_dec(&nfsi->data_updates); } /** * nfs_end_data_update_defer * @inode - pointer to inode * Declare end of the operations that will update file data * This will defer marking the inode as needing revalidation * unless there are no other pending updates. */ void nfs_end_data_update_defer(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); if (atomic_dec_and_test(&nfsi->data_updates)) { /* Mark the attribute cache for revalidation */ nfsi->flags |= NFS_INO_INVALID_ATTR; /* Directories and symlinks: invalidate page cache too */ if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) nfsi->flags |= NFS_INO_INVALID_DATA; nfsi->cache_change_attribute ++; } } /** * nfs_refresh_inode - 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. */ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) { struct nfs_inode *nfsi = NFS_I(inode); loff_t cur_size, new_isize; int data_unstable; /* Do we hold a delegation? */ if (nfs_have_delegation(inode, FMODE_READ)) return 0; /* Are we in the process of updating data on the server? */ data_unstable = nfs_caches_unstable(inode); if (fattr->valid & NFS_ATTR_FATTR_V4) { if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0 && nfsi->change_attr == fattr->pre_change_attr) nfsi->change_attr = fattr->change_attr; if (!data_unstable && nfsi->change_attr != fattr->change_attr) nfsi->flags |= NFS_INO_INVALID_ATTR; } if ((fattr->valid & NFS_ATTR_FATTR) == 0) return 0; /* 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; cur_size = i_size_read(inode); new_isize = nfs_size_to_loff_t(fattr->size); /* 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)); if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); } /* Verify a few of the more important attributes */ if (!data_unstable) { if (!timespec_equal(&inode->i_mtime, &fattr->mtime) || cur_size != new_isize) nfsi->flags |= NFS_INO_INVALID_ATTR; } else if (S_ISREG(inode->i_mode) && new_isize > cur_size) nfsi->flags |= NFS_INO_INVALID_ATTR; /* 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->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS; /* Has the link count changed? */ if (inode->i_nlink != fattr->nlink) nfsi->flags |= NFS_INO_INVALID_ATTR; if (!timespec_equal(&inode->i_atime, &fattr->atime)) nfsi->flags |= NFS_INO_INVALID_ATIME; nfsi->read_cache_jiffies = fattr->timestamp; return 0; } /* * 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, unsigned long verifier) { struct nfs_inode *nfsi = NFS_I(inode); __u64 new_size; loff_t new_isize; unsigned int invalid = 0; loff_t cur_isize; int data_unstable; 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 ((fattr->valid & NFS_ATTR_FATTR) == 0) return 0; if (nfsi->fileid != fattr->fileid) { printk(KERN_ERR "%s: inode number mismatch\n" "expected (%s/0x%Lx), got (%s/0x%Lx)\n", __FUNCTION__, inode->i_sb->s_id, (long long)nfsi->fileid, inode->i_sb->s_id, (long long)fattr->fileid); goto out_err; } /* * 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->timestamp; /* Are we racing with known updates of the metadata on the server? */ data_unstable = ! nfs_verify_change_attribute(inode, verifier); /* Check if the file size agrees */ new_size = fattr->size; new_isize = nfs_size_to_loff_t(fattr->size); cur_isize = i_size_read(inode); if (cur_isize != new_size) { #ifdef NFS_DEBUG_VERBOSE printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); #endif /* * If we have pending writebacks, things can get * messy. */ if (S_ISREG(inode->i_mode) && data_unstable) { if (new_isize > cur_isize) { inode->i_size = new_isize; invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; } } else { inode->i_size = new_isize; invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; } } /* * Note: we don't check inode->i_mtime since pipes etc. * can change this value in VFS without requiring a * cache revalidation. */ if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); #ifdef NFS_DEBUG_VERBOSE printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); #endif if (!data_unstable) invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; } if ((fattr->valid & NFS_ATTR_FATTR_V4) && nfsi->change_attr != fattr->change_attr) { #ifdef NFS_DEBUG_VERBOSE printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino); #endif nfsi->change_attr = fattr->change_attr; if (!data_unstable) invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS; } memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); 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; 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; } /* Update attrtimeo value if we're out of the unstable period */ if (invalid & NFS_INO_INVALID_ATTR) { 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 (!nfs_have_delegation(inode, FMODE_READ)) nfsi->flags |= 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 /* * 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); out_err: NFS_FLAGS(inode) |= NFS_INO_STALE; return -ESTALE; } /* * 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; struct super_block *s; struct nfs_fh *root; struct nfs_mount_data *data = raw_data; if (!data) { printk("nfs_read_super: missing data argument\n"); return ERR_PTR(-EINVAL); } server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); if (!server) return ERR_PTR(-ENOMEM); memset(server, 0, sizeof(struct nfs_server)); /* Zero out the NFS state stuff */ init_nfsv4_state(server); if (data->version != NFS_MOUNT_VERSION) { printk("nfs warning: mount version %s than kernel\n", data->version < NFS_MOUNT_VERSION ? "older" : "newer"); if (data->version < 2) data->namlen = 0; if (data->version < 3) data->bsize = 0; if (data->version < 4) { data->flags &= ~NFS_MOUNT_VER3; data->root.size = NFS2_FHSIZE; memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); } if (data->version < 5) data->flags &= ~NFS_MOUNT_SECFLAVOUR; } root = &server->fh; if (data->flags & NFS_MOUNT_VER3) root->size = data->root.size; else root->size = NFS2_FHSIZE; if (root->size > sizeof(root->data)) { printk("nfs_get_sb: invalid root filehandle\n"); kfree(server); return ERR_PTR(-EINVAL); } 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) { printk("NFS: mount program didn't pass remote address!\n"); kfree(server); return ERR_PTR(-EINVAL); } s = sget(fs_type, nfs_compare_super, nfs_set_super, server); if (IS_ERR(s) || s->s_root) { kfree(server); return s; } s->s_flags = flags; /* Fire up rpciod if not yet running */ if (rpciod_up() != 0) { printk(KERN_WARNING "NFS: couldn't start rpciod!\n"); kfree(server); return ERR_PTR(-EIO); } error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0); if (error) { up_write(&s->s_umount); deactivate_super(s); return ERR_PTR(error); } s->s_flags |= MS_ACTIVE; return s; } static void nfs_kill_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); kill_anon_super(s); if (server->client != NULL && !IS_ERR(server->client)) rpc_shutdown_client(server->client); if (server->client_sys != NULL && !IS_ERR(server->client_sys)) rpc_shutdown_client(server->client_sys); if (!(server->flags & NFS_MOUNT_NONLM)) lockd_down(); /* release rpc.lockd */ rpciod_down(); /* release rpciod */ if (server->hostname != NULL) 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, }; /* * 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! */ if (nfsi->delegation != NULL) 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 proto, 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; /* Initialize timeout values */ timeparms.to_initval = data->timeo * HZ / 10; timeparms.to_retries = data->retrans; timeparms.to_exponential = 1; if (!timeparms.to_retries) timeparms.to_retries = 5; proto = data->proto; /* Which IP protocol do we use? */ switch (proto) { case IPPROTO_TCP: timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT; if (!timeparms.to_initval) timeparms.to_initval = 600 * HZ / 10; break; case IPPROTO_UDP: timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT; if (!timeparms.to_initval) timeparms.to_initval = 11 * HZ / 10; break; default: return -EINVAL; } clp = nfs4_get_client(&server->addr.sin_addr); if (!clp) { printk(KERN_WARNING "NFS: failed to create NFS4 client.\n"); return -EIO; } /* Now create transport and client */ authflavour = RPC_AUTH_UNIX; if (data->auth_flavourlen != 0) { if (data->auth_flavourlen > 1) printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n"); if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { err = -EFAULT; goto out_fail; } } down_write(&clp->cl_sem); if (clp->cl_rpcclient == NULL) { xprt = xprt_create_proto(proto, &server->addr, &timeparms); if (IS_ERR(xprt)) { up_write(&clp->cl_sem); printk(KERN_WARNING "NFS: cannot create RPC transport.\n"); err = PTR_ERR(xprt); 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); printk(KERN_WARNING "NFS: cannot create RPC client.\n"); xprt_destroy(xprt); err = PTR_ERR(clnt); goto out_fail; } clnt->cl_intr = 1; clnt->cl_softrtry = 1; clnt->cl_chatty = 1; clp->cl_rpcclient = clnt; clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0); if (IS_ERR(clp->cl_cred)) { up_write(&clp->cl_sem); err = PTR_ERR(clp->cl_cred); clp->cl_cred = NULL; goto out_fail; } memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); nfs_idmap_new(clp); } if (list_empty(&clp->cl_superblocks)) { err = nfs4_init_client(clp); if (err != 0) { up_write(&clp->cl_sem); goto out_fail; } } 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)) { printk(KERN_WARNING "NFS: cannot create RPC client.\n"); return PTR_ERR(clnt); } server->client = clnt; if (server->nfs4_state->cl_idmap == NULL) { printk(KERN_WARNING "NFS: failed to create idmapper.\n"); return -ENOMEM; } if (clnt->cl_auth->au_flavor != authflavour) { if (rpcauth_create(authflavour, clnt) == NULL) { printk(KERN_WARNING "NFS: couldn't create credcache!\n"); return -ENOMEM; } } 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)) { if (p != NULL) 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) { printk("nfs_read_super: missing data argument\n"); return ERR_PTR(-EINVAL); } server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); if (!server) return ERR_PTR(-ENOMEM); memset(server, 0, sizeof(struct nfs_server)); /* Zero out the NFS state stuff */ init_nfsv4_state(server); if (data->version != NFS4_MOUNT_VERSION) { printk("nfs warning: mount version %s than kernel\n", data->version < NFS4_MOUNT_VERSION ? "older" : "newer"); } 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) { printk("NFS: mount program didn't pass remote IP address!\n"); s = ERR_PTR(-EINVAL); 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; /* Fire up rpciod if not yet running */ if (rpciod_up() != 0) { printk(KERN_WARNING "NFS: couldn't start rpciod!\n"); s = ERR_PTR(-EIO); goto out_free; } error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 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: if (server->mnt_path) kfree(server->mnt_path); if (server->hostname) 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); rpciod_down(); /* release rpciod */ destroy_nfsv4_state(server); if (server->hostname != NULL) 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, }; #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) #define register_nfs4fs() register_filesystem(&nfs4_fs_type) #define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type) #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 = 0; 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; init_waitqueue_head(&nfsi->nfs_i_wait); 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, 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 nfs_destroy_writepagecache(); #ifdef CONFIG_NFS_DIRECTIO out0: nfs_destroy_directcache(); #endif 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)