diff options
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 1207 |
1 files changed, 444 insertions, 763 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 5842d510d732c..867b5dcd3a40a 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -13,6 +13,11 @@ * * Split from inode.c by David Howells <dhowells@redhat.com> * + * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a + * particular server are held in the same superblock + * - NFS superblocks can have several effective roots to the dentry tree + * - directory type roots are spliced into the tree when a path from one root reaches the root + * of another (see nfs_lookup()) */ #include <linux/config.h> @@ -52,20 +57,12 @@ #define NFSDBG_FACILITY NFSDBG_VFS -/* 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_umount_begin(struct vfsmount *, int); static int nfs_statfs(struct dentry *, struct kstatfs *); static int nfs_show_options(struct seq_file *, struct vfsmount *); static int nfs_show_stats(struct seq_file *, struct vfsmount *); static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); -static int nfs_clone_nfs_sb(struct file_system_type *fs_type, +static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); static void nfs_kill_super(struct super_block *); @@ -77,10 +74,10 @@ static struct file_system_type nfs_fs_type = { .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; -struct file_system_type clone_nfs_fs_type = { +struct file_system_type nfs_xdev_fs_type = { .owner = THIS_MODULE, .name = "nfs", - .get_sb = nfs_clone_nfs_sb, + .get_sb = nfs_xdev_get_sb, .kill_sb = nfs_kill_super, .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; @@ -99,10 +96,10 @@ static struct super_operations nfs_sops = { #ifdef CONFIG_NFS_V4 static int nfs4_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); -static int nfs_clone_nfs4_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); -static int nfs_referral_nfs4_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); +static int nfs4_xdev_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); +static int nfs4_referral_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); static void nfs4_kill_super(struct super_block *sb); static struct file_system_type nfs4_fs_type = { @@ -113,18 +110,18 @@ static struct file_system_type nfs4_fs_type = { .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; -struct file_system_type clone_nfs4_fs_type = { +struct file_system_type nfs4_xdev_fs_type = { .owner = THIS_MODULE, .name = "nfs4", - .get_sb = nfs_clone_nfs4_sb, + .get_sb = nfs4_xdev_get_sb, .kill_sb = nfs4_kill_super, .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; -struct file_system_type nfs_referral_nfs4_fs_type = { +struct file_system_type nfs4_referral_fs_type = { .owner = THIS_MODULE, .name = "nfs4", - .get_sb = nfs_referral_nfs4_sb, + .get_sb = nfs4_referral_get_sb, .kill_sb = nfs4_kill_super, .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, }; @@ -345,7 +342,7 @@ static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) nfs_show_mount_options(m, nfss, 0); seq_puts(m, ",addr="); - seq_escape(m, nfss->hostname, " \t\n\\"); + seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\"); return 0; } @@ -429,714 +426,351 @@ static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) /* * Begin unmount by attempting to remove all automounted mountpoints we added - * in response to traversals + * in response to xdev traversals and referrals */ static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) { - struct nfs_server *server; - struct rpc_clnt *rpc; - shrink_submounts(vfsmnt, &nfs_automount_list); - if (!(flags & MNT_FORCE)) - return; - /* -EIO all pending I/O */ - server = NFS_SB(vfsmnt->mnt_sb); - rpc = server->client; - if (!IS_ERR(rpc)) - rpc_killall_tasks(rpc); - rpc = server->client_acl; - if (!IS_ERR(rpc)) - rpc_killall_tasks(rpc); } /* - * Obtain the root inode of the file system. + * Validate the NFS2/NFS3 mount data + * - fills in the mount root filehandle */ -static struct inode * -nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) +static int nfs_validate_mount_data(struct nfs_mount_data *data, + struct nfs_fh *mntfh) { - struct nfs_server *server = NFS_SB(sb); - int error; - - error = server->nfs_client->rpc_ops->getroot(server, rootfh, fsinfo); - if (error < 0) { - dprintk("nfs_get_root: getattr error = %d\n", -error); - return ERR_PTR(error); + if (data == NULL) { + dprintk("%s: missing data argument\n", __FUNCTION__); + return -EINVAL; } - server->fsid = fsinfo->fattr->fsid; - 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; + if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { + dprintk("%s: bad mount version\n", __FUNCTION__); + return -EINVAL; + } - 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; + 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); + return -EINVAL; + } + 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); + return -EINVAL; + } + /* Fill in pseudoflavor for mount version < 5 */ + data->pseudoflavor = RPC_AUTH_UNIX; + case 5: + memset(data->context, 0, sizeof(data->context)); } - sb->s_root = d_alloc_root(root_inode); - if (!sb->s_root) { - no_root_error = -ENOMEM; - goto out_no_root; + +#ifndef CONFIG_NFS_V3 + /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ + if (data->flags & NFS_MOUNT_VER3) { + dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); + return -EPROTONOSUPPORT; } - sb->s_root->d_op = server->nfs_client->rpc_ops->dentry_ops; - - /* mount time stamp, in seconds */ - server->mount_time = jiffies; - - /* Get some general file system info */ - if (server->namelen == 0 && - server->nfs_client->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; +#endif /* CONFIG_NFS_V3 */ - 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; + /* We now require that the mount process passes the remote address */ + if (data->addr.sin_addr.s_addr == INADDR_ANY) { + dprintk("%s: mount program didn't pass remote address!\n", + __FUNCTION__); + return -EINVAL; } - server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; - nfs_super_set_maxbytes(sb, fsinfo.maxfilesize); + /* Prepare the root filehandle */ + if (data->flags & NFS_MOUNT_VER3) + mntfh->size = data->root.size; + else + mntfh->size = NFS2_FHSIZE; - server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; - server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; + if (mntfh->size > sizeof(mntfh->data)) { + dprintk("%s: invalid root filehandle\n", __FUNCTION__); + return -EINVAL; + } + + memcpy(mntfh->data, data->root.data, mntfh->size); + if (mntfh->size < sizeof(mntfh->data)) + memset(mntfh->data + mntfh->size, 0, + sizeof(mntfh->data) - mntfh->size); - /* 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. + * Initialise the common bits of the superblock */ -static struct rpc_clnt * -nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) +static inline void nfs_initialise_sb(struct super_block *sb) { - struct nfs_client *clp; - struct rpc_clnt *clnt; - int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; - int nfsversion = 2; - int err; - -#ifdef CONFIG_NFS_V3 - if (server->flags & NFS_MOUNT_VER3) - nfsversion = 3; -#endif - - clp = nfs_get_client(server->hostname, &server->addr, nfsversion); - if (!clp) { - dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); - return ERR_PTR(PTR_ERR(clp)); - } - - if (clp->cl_cons_state == NFS_CS_INITING) { - /* Check NFS protocol revision and initialize RPC op - * vector and file handle pool. */ -#ifdef CONFIG_NFS_V3 - if (nfsversion == 3) { - clp->rpc_ops = &nfs_v3_clientops; - server->caps |= NFS_CAP_READDIRPLUS; - } else { - clp->rpc_ops = &nfs_v2_clientops; - } -#else - clp->rpc_ops = &nfs_v2_clientops; -#endif - - /* create transport and client */ - err = nfs_create_rpc_client(clp, proto, data->timeo, - data->retrans, RPC_AUTH_UNIX); - if (err < 0) - goto client_init_error; - - nfs_mark_client_ready(clp, 0); - } + struct nfs_server *server = NFS_SB(sb); - /* create an nfs_server-specific client */ - clnt = rpc_clone_client(clp->cl_rpcclient); - if (IS_ERR(clnt)) { - dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__); - nfs_put_client(clp); - return ERR_PTR(PTR_ERR(clnt)); - } + sb->s_magic = NFS_SUPER_MAGIC; - if (data->pseudoflavor != clp->cl_rpcclient->cl_auth->au_flavor) { - struct rpc_auth *auth; + /* 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)); - auth = rpcauth_create(data->pseudoflavor, server->client); - if (IS_ERR(auth)) { - dprintk("%s: couldn't create credcache!\n", __FUNCTION__); - return ERR_PTR(PTR_ERR(auth)); - } - } + if (sb->s_blocksize == 0) + sb->s_blocksize = nfs_block_bits(server->wsize, + &sb->s_blocksize_bits); - server->nfs_client = clp; - return clnt; + if (server->flags & NFS_MOUNT_NOAC) + sb->s_flags |= MS_SYNCHRONOUS; -client_init_error: - nfs_mark_client_ready(clp, err); - nfs_put_client(clp); - return ERR_PTR(err); + nfs_super_set_maxbytes(sb, server->maxfilesize); } /* - * Clone a server record + * Finish setting up an NFS2/3 superblock */ -static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_clone_mount *data) +static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data) { struct nfs_server *server = NFS_SB(sb); - struct nfs_server *parent = NFS_SB(data->sb); - struct inode *root_inode; - struct nfs_fsinfo fsinfo; - void *err = ERR_PTR(-ENOMEM); - - sb->s_op = data->sb->s_op; - sb->s_blocksize = data->sb->s_blocksize; - sb->s_blocksize_bits = data->sb->s_blocksize_bits; - sb->s_maxbytes = data->sb->s_maxbytes; - - server->client_acl = ERR_PTR(-EINVAL); - server->io_stats = nfs_alloc_iostats(); - if (server->io_stats == NULL) - goto out; - - server->client = rpc_clone_client(parent->client); - if (IS_ERR((err = server->client))) - goto out; - - if (!IS_ERR(parent->client_acl)) { - server->client_acl = rpc_clone_client(parent->client_acl); - if (IS_ERR((err = server->client_acl))) - goto out; - } - root_inode = nfs_fhget(sb, data->fh, data->fattr); - if (!root_inode) - goto out; - sb->s_root = d_alloc_root(root_inode); - if (!sb->s_root) - goto out_put_root; - fsinfo.fattr = data->fattr; - if (NFS_PROTO(root_inode)->fsinfo(server, data->fh, &fsinfo) == 0) - nfs_super_set_maxbytes(sb, fsinfo.maxfilesize); - sb->s_root->d_op = server->nfs_client->rpc_ops->dentry_ops; - sb->s_flags |= MS_ACTIVE; - return server; -out_put_root: - iput(root_inode); -out: - return err; -} - -/* - * Copy an existing superblock and attach revised data - */ -static int nfs_clone_generic_sb(struct nfs_clone_mount *data, - struct super_block *(*fill_sb)(struct nfs_server *, struct nfs_clone_mount *), - struct nfs_server *(*fill_server)(struct super_block *, struct nfs_clone_mount *), - struct vfsmount *mnt) -{ - struct nfs_server *server; - struct nfs_server *parent = NFS_SB(data->sb); - struct super_block *sb = ERR_PTR(-EINVAL); - char *hostname; - int error = -ENOMEM; - int len; - - server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); - if (server == NULL) - goto out_err; - memcpy(server, parent, sizeof(*server)); - atomic_inc(&server->nfs_client->cl_count); - hostname = (data->hostname != NULL) ? data->hostname : parent->hostname; - len = strlen(hostname) + 1; - server->hostname = kmalloc(len, GFP_KERNEL); - if (server->hostname == NULL) - goto free_server; - memcpy(server->hostname, hostname, len); - - sb = fill_sb(server, data); - if (IS_ERR(sb)) { - error = PTR_ERR(sb); - goto free_hostname; - } - if (sb->s_root) - goto out_share; + sb->s_blocksize_bits = 0; + sb->s_blocksize = 0; + if (data->bsize) + sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); - server = fill_server(sb, data); - if (IS_ERR(server)) { - error = PTR_ERR(server); - goto out_deactivate; + if (server->flags & NFS_MOUNT_VER3) { + /* The VFS shouldn't apply the umask to mode bits. We will do + * so ourselves when necessary. + */ + sb->s_flags |= MS_POSIXACL; + sb->s_time_gran = 1; } - return simple_set_mnt(mnt, sb); -out_deactivate: - up_write(&sb->s_umount); - deactivate_super(sb); - return error; -out_share: - kfree(server->hostname); - nfs_put_client(server->nfs_client); - kfree(server); - return simple_set_mnt(mnt, sb); -free_hostname: - kfree(server->hostname); -free_server: - nfs_put_client(server->nfs_client); - kfree(server); -out_err: - return error; + + sb->s_op = &nfs_sops; + nfs_initialise_sb(sb); } /* - * Set up an NFS2/3 superblock - * - * 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. + * Finish setting up a cloned NFS2/3 superblock */ -static int -nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) +static void nfs_clone_super(struct super_block *sb, + const struct super_block *old_sb) { - struct nfs_server *server; - rpc_authflavor_t authflavor; + struct nfs_server *server = NFS_SB(sb); + + sb->s_blocksize_bits = old_sb->s_blocksize_bits; + sb->s_blocksize = old_sb->s_blocksize; + sb->s_maxbytes = old_sb->s_maxbytes; - 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); - - /* 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 (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. + /* 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); + sb->s_op = old_sb->s_op; + nfs_initialise_sb(sb); } -static int nfs_set_super(struct super_block *s, void *data) +static int nfs_set_super(struct super_block *s, void *_server) { - s->s_fs_info = data; - return set_anon_super(s, data); + struct nfs_server *server = _server; + int ret; + + s->s_fs_info = server; + ret = set_anon_super(s, server); + if (ret == 0) + server->s_dev = s->s_dev; + return ret; } static int nfs_compare_super(struct super_block *sb, void *data) { - struct nfs_server *server = data; - struct nfs_server *old = NFS_SB(sb); + struct nfs_server *server = data, *old = NFS_SB(sb); - if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) + if (old->nfs_client != server->nfs_client) return 0; - if (old->addr.sin_port != server->addr.sin_port) + if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) return 0; - return !nfs_compare_fh(&old->fh, &server->fh); + return 1; } static int nfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { - int error; struct nfs_server *server = NULL; struct super_block *s; - struct nfs_fh *root; + struct nfs_fh mntfh; struct nfs_mount_data *data = raw_data; + struct dentry *mntroot; + int error; - error = -EINVAL; - if (data == NULL) { - dprintk("%s: missing data argument\n", __FUNCTION__); - goto out_err_noserver; - } - if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { - dprintk("%s: bad mount version\n", __FUNCTION__); - goto out_err_noserver; - } - 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_noserver; - } - 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_noserver; - } - case 5: - memset(data->context, 0, sizeof(data->context)); - } -#ifndef CONFIG_NFS_V3 - /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ - error = -EPROTONOSUPPORT; - if (data->flags & NFS_MOUNT_VER3) { - dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); - goto out_err_noserver; - } -#endif /* CONFIG_NFS_V3 */ + /* Validate the mount data */ + error = nfs_validate_mount_data(data, &mntfh); + if (error < 0) + return error; - error = -ENOMEM; - server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); - if (!server) + /* Get a volume representation */ + server = nfs_create_server(data, &mntfh); + if (IS_ERR(server)) { + error = PTR_ERR(server); goto out_err_noserver; - /* Zero out the NFS state stuff */ - init_nfsv4_state(server); - server->client = 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; - error = -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; } + /* Get a superblock - note that we may end up sharing one that already exists */ s = sget(fs_type, nfs_compare_super, nfs_set_super, server); if (IS_ERR(s)) { error = PTR_ERR(s); - goto out_err; + goto out_err_nosb; } - if (s->s_root) - goto out_share; + if (s->s_fs_info != server) { + nfs_free_server(server); + server = NULL; + } - s->s_flags = flags; + if (!s->s_root) { + /* initial superblock/root creation */ + s->s_flags = flags; + nfs_fill_super(s, data); + } - error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); - if (error) { - up_write(&s->s_umount); - deactivate_super(s); - return error; + mntroot = nfs_get_root(s, &mntfh); + if (IS_ERR(mntroot)) { + error = PTR_ERR(mntroot); + goto error_splat_super; } - s->s_flags |= MS_ACTIVE; - return simple_set_mnt(mnt, s); -out_share: - kfree(server); - return simple_set_mnt(mnt, s); + s->s_flags |= MS_ACTIVE; + mnt->mnt_sb = s; + mnt->mnt_root = mntroot; + return 0; -out_err: - kfree(server); +out_err_nosb: + nfs_free_server(server); out_err_noserver: return error; + +error_splat_super: + up_write(&s->s_umount); + deactivate_super(s); + return error; } +/* + * Destroy an NFS2/3 superblock + */ 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_acl)) - rpc_shutdown_client(server->client_acl); - - if (!(server->flags & NFS_MOUNT_NONLM)) - lockd_down(); /* release rpc.lockd */ - - nfs_free_iostats(server->io_stats); - kfree(server->hostname); - nfs_put_client(server->nfs_client); - kfree(server); - nfs_release_automount_timer(); + nfs_free_server(server); } -static struct super_block *nfs_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data) -{ - struct super_block *sb; - - server->fsid = data->fattr->fsid; - nfs_copy_fh(&server->fh, data->fh); - sb = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); - if (!IS_ERR(sb) && sb->s_root == NULL && !(server->flags & NFS_MOUNT_NONLM)) - lockd_up(); - return sb; -} - -static int nfs_clone_nfs_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) +/* + * Clone an NFS2/3 server record on xdev traversal (FSID-change) + */ +static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, + const char *dev_name, void *raw_data, + struct vfsmount *mnt) { struct nfs_clone_mount *data = raw_data; - return nfs_clone_generic_sb(data, nfs_clone_sb, nfs_clone_server, mnt); -} + struct super_block *s; + struct nfs_server *server; + struct dentry *mntroot; + int error; -#ifdef CONFIG_NFS_V4 -static struct rpc_clnt *nfs4_create_client(struct nfs_server *server, - int timeo, int retrans, int proto, rpc_authflavor_t flavor) -{ - struct nfs_client *clp; - struct rpc_clnt *clnt = NULL; - int err = -EIO; - - clp = nfs_get_client(server->hostname, &server->addr, 4); - if (!clp) { - dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); - return ERR_PTR(err); - } + dprintk("--> nfs_xdev_get_sb()\n"); - /* Now create transport and client */ - if (clp->cl_cons_state == NFS_CS_INITING) { - clp->rpc_ops = &nfs_v4_clientops; + /* create a new volume representation */ + server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); + if (IS_ERR(server)) { + error = PTR_ERR(server); + goto out_err_noserver; + } - err = nfs_create_rpc_client(clp, proto, timeo, retrans, flavor); - if (err < 0) - goto client_init_error; + /* Get a superblock - note that we may end up sharing one that already exists */ + s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); + if (IS_ERR(s)) { + error = PTR_ERR(s); + goto out_err_nosb; + } - memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); - err = nfs_idmap_new(clp); - if (err < 0) { - dprintk("%s: failed to create idmapper.\n", - __FUNCTION__); - goto client_init_error; - } - __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); - nfs_mark_client_ready(clp, 0); + if (s->s_fs_info != server) { + nfs_free_server(server); + server = NULL; } - clnt = rpc_clone_client(clp->cl_rpcclient); + if (!s->s_root) { + /* initial superblock/root creation */ + s->s_flags = flags; + nfs_clone_super(s, data->sb); + } - if (IS_ERR(clnt)) { - dprintk("%s: cannot create RPC client. Error = %d\n", - __FUNCTION__, err); - return clnt; + mntroot = nfs_get_root(s, data->fh); + if (IS_ERR(mntroot)) { + error = PTR_ERR(mntroot); + goto error_splat_super; } - if (clnt->cl_auth->au_flavor != flavor) { - struct rpc_auth *auth; + s->s_flags |= MS_ACTIVE; + mnt->mnt_sb = s; + mnt->mnt_root = mntroot; - auth = rpcauth_create(flavor, clnt); - if (IS_ERR(auth)) { - dprintk("%s: couldn't create credcache!\n", __FUNCTION__); - return (struct rpc_clnt *)auth; - } - } + dprintk("<-- nfs_xdev_get_sb() = 0\n"); + return 0; - server->nfs_client = clp; - down_write(&clp->cl_sem); - list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); - up_write(&clp->cl_sem); - return clnt; +out_err_nosb: + nfs_free_server(server); +out_err_noserver: + dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); + return error; -client_init_error: - nfs_mark_client_ready(clp, err); - nfs_put_client(clp); - return ERR_PTR(err); +error_splat_super: + up_write(&s->s_umount); + deactivate_super(s); + dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); + return error; } +#ifdef CONFIG_NFS_V4 + /* - * Set up an NFS4 superblock + * Finish setting up a cloned NFS4 superblock */ -static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) +static void nfs4_clone_super(struct super_block *sb, + const struct super_block *old_sb) { - struct nfs_server *server; - 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; - - /* 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; - } - } - - server->client = nfs4_create_client(server, data->timeo, data->retrans, - data->proto, authflavour); - if (IS_ERR(server->client)) { - err = PTR_ERR(server->client); - dprintk("%s: cannot create RPC client. Error = %d\n", - __FUNCTION__, err); - goto out_fail; - } - + sb->s_blocksize_bits = old_sb->s_blocksize_bits; + sb->s_blocksize = old_sb->s_blocksize; + sb->s_maxbytes = old_sb->s_maxbytes; sb->s_time_gran = 1; - - sb->s_op = &nfs4_sops; - err = nfs_sb_init(sb, authflavour); - - out_fail: - return err; + sb->s_op = old_sb->s_op; + nfs_initialise_sb(sb); } -static int nfs4_compare_super(struct super_block *sb, void *data) +/* + * Set up an NFS4 superblock + */ +static void nfs4_fill_super(struct super_block *sb) { - 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; + sb->s_time_gran = 1; + sb->s_op = &nfs4_sops; + nfs_initialise_sb(sb); } -static void * -nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) +static void *nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) { void *p = NULL; @@ -1157,14 +791,22 @@ nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) return dst; } +/* + * Get the superblock for an NFS4 mountpoint + */ static int nfs4_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { - int error; - struct nfs_server *server; - struct super_block *s; struct nfs4_mount_data *data = raw_data; + struct super_block *s; + struct nfs_server *server; + struct sockaddr_in addr; + rpc_authflavor_t authflavour; + struct nfs_fh mntfh; + struct dentry *mntroot; + char *mntpath = NULL, *hostname = NULL, ip_addr[16]; void *p; + int error; if (data == NULL) { dprintk("%s: missing data argument\n", __FUNCTION__); @@ -1175,75 +817,107 @@ static int nfs4_get_sb(struct file_system_type *fs_type, return -EINVAL; } - server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); - if (!server) - return -ENOMEM; - /* Zero out the NFS state stuff */ - init_nfsv4_state(server); - server->client = server->client_acl = ERR_PTR(-EINVAL); + /* We now require that the mount process passes the remote address */ + if (data->host_addrlen != sizeof(addr)) + return -EINVAL; + + if (copy_from_user(&addr, data->host_addr, sizeof(addr))) + return -EFAULT; + + if (addr.sin_family != AF_INET || + addr.sin_addr.s_addr == INADDR_ANY + ) { + dprintk("%s: mount program didn't pass remote IP address!\n", + __FUNCTION__); + return -EINVAL; + } + + /* Grab the authentication type */ + 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); + error = -EINVAL; + goto out_err_noserver; + } + + if (copy_from_user(&authflavour, data->auth_flavours, + sizeof(authflavour))) { + error = -EFAULT; + goto out_err_noserver; + } + } p = nfs_copy_user_string(NULL, &data->hostname, 256); if (IS_ERR(p)) goto out_err; - server->hostname = p; + hostname = p; p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); if (IS_ERR(p)) goto out_err; - server->mnt_path = p; + mntpath = p; - p = nfs_copy_user_string(server->ip_addr, &data->client_addr, - sizeof(server->ip_addr) - 1); + dprintk("MNTPATH: %s\n", mntpath); + + p = nfs_copy_user_string(ip_addr, &data->client_addr, + sizeof(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)) { - error = -EINVAL; - goto out_free; - } - if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { - error = -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__); - error = -EINVAL; - goto out_free; + /* Get a volume representation */ + server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr, + authflavour, &mntfh); + if (IS_ERR(server)) { + error = PTR_ERR(server); + goto out_err_noserver; } - s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); + /* Get a superblock - note that we may end up sharing one that already exists */ + s = sget(fs_type, nfs_compare_super, nfs_set_super, server); if (IS_ERR(s)) { error = PTR_ERR(s); goto out_free; } - if (s->s_root) { - kfree(server->mnt_path); - kfree(server->hostname); - kfree(server); - return simple_set_mnt(mnt, s); - } + if (!s->s_root) { + /* initial superblock/root creation */ + s->s_flags = flags; - s->s_flags = flags; + nfs4_fill_super(s); + } else { + nfs_free_server(server); + } - error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0); - if (error) { - up_write(&s->s_umount); - deactivate_super(s); - return error; + mntroot = nfs4_get_root(s, &mntfh); + if (IS_ERR(mntroot)) { + error = PTR_ERR(mntroot); + goto error_splat_super; } + s->s_flags |= MS_ACTIVE; - return simple_set_mnt(mnt, s); + mnt->mnt_sb = s; + mnt->mnt_root = mntroot; + kfree(mntpath); + kfree(hostname); + return 0; + out_err: error = PTR_ERR(p); + goto out_err_noserver; + out_free: - kfree(server->mnt_path); - kfree(server->hostname); - kfree(server); + nfs_free_server(server); +out_err_noserver: + kfree(mntpath); + kfree(hostname); return error; + +error_splat_super: + up_write(&s->s_umount); + deactivate_super(s); + goto out_err_noserver; } static void nfs4_kill_super(struct super_block *sb) @@ -1254,133 +928,140 @@ static void nfs4_kill_super(struct super_block *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); - - nfs_free_iostats(server->io_stats); - kfree(server->hostname); - kfree(server); - nfs_release_automount_timer(); + nfs_free_server(server); } /* - * Constructs the SERVER-side path + * Clone an NFS4 server record on xdev traversal (FSID-change) */ -static inline char *nfs4_dup_path(const struct dentry *dentry) +static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, + const char *dev_name, void *raw_data, + struct vfsmount *mnt) { - char *page = (char *) __get_free_page(GFP_USER); - char *path; + struct nfs_clone_mount *data = raw_data; + struct super_block *s; + struct nfs_server *server; + struct dentry *mntroot; + int error; - path = nfs4_path(dentry, page, PAGE_SIZE); - if (!IS_ERR(path)) { - int len = PAGE_SIZE + page - path; - char *tmp = path; + dprintk("--> nfs4_xdev_get_sb()\n"); - path = kmalloc(len, GFP_KERNEL); - if (path) - memcpy(path, tmp, len); - else - path = ERR_PTR(-ENOMEM); + /* create a new volume representation */ + server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); + if (IS_ERR(server)) { + error = PTR_ERR(server); + goto out_err_noserver; } - free_page((unsigned long)page); - return path; -} -static struct super_block *nfs4_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data) -{ - const struct dentry *dentry = data->dentry; - struct nfs_client *clp = server->nfs_client; - struct super_block *sb; - - server->fsid = data->fattr->fsid; - nfs_copy_fh(&server->fh, data->fh); - server->mnt_path = nfs4_dup_path(dentry); - if (IS_ERR(server->mnt_path)) { - sb = (struct super_block *)server->mnt_path; - goto err; + /* Get a superblock - note that we may end up sharing one that already exists */ + s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); + if (IS_ERR(s)) { + error = PTR_ERR(s); + goto out_err_nosb; } - sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server); - if (IS_ERR(sb) || sb->s_root) - goto free_path; - nfs4_server_capabilities(server, &server->fh); - - down_write(&clp->cl_sem); - list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); - up_write(&clp->cl_sem); - return sb; -free_path: - kfree(server->mnt_path); -err: - server->mnt_path = NULL; - return sb; -} -static int nfs_clone_nfs4_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) -{ - struct nfs_clone_mount *data = raw_data; - return nfs_clone_generic_sb(data, nfs4_clone_sb, nfs_clone_server, mnt); -} + if (s->s_fs_info != server) { + nfs_free_server(server); + server = NULL; + } -static struct super_block *nfs4_referral_sb(struct nfs_server *server, struct nfs_clone_mount *data) -{ - struct super_block *sb = ERR_PTR(-ENOMEM); - int len; - - len = strlen(data->mnt_path) + 1; - server->mnt_path = kmalloc(len, GFP_KERNEL); - if (server->mnt_path == NULL) - goto err; - memcpy(server->mnt_path, data->mnt_path, len); - memcpy(&server->addr, data->addr, sizeof(struct sockaddr_in)); - - sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server); - if (IS_ERR(sb) || sb->s_root) - goto free_path; - return sb; -free_path: - kfree(server->mnt_path); -err: - server->mnt_path = NULL; - return sb; -} + if (!s->s_root) { + /* initial superblock/root creation */ + s->s_flags = flags; + nfs4_clone_super(s, data->sb); + } -static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data) -{ - struct nfs_server *server = NFS_SB(sb); - int proto, timeo, retrans; - void *err; - - proto = IPPROTO_TCP; - /* Since we are following a referral and there may be alternatives, - set the timeouts and retries to low values */ - timeo = 2; - retrans = 1; - - nfs_put_client(server->nfs_client); - server->nfs_client = NULL; - server->client = nfs4_create_client(server, timeo, retrans, proto, - data->authflavor); - if (IS_ERR((err = server->client))) - goto out_err; + mntroot = nfs4_get_root(s, data->fh); + if (IS_ERR(mntroot)) { + error = PTR_ERR(mntroot); + goto error_splat_super; + } - sb->s_time_gran = 1; - sb->s_op = &nfs4_sops; - err = ERR_PTR(nfs_sb_init(sb, data->authflavor)); - if (!IS_ERR(err)) - return server; -out_err: - return (struct nfs_server *)err; + s->s_flags |= MS_ACTIVE; + mnt->mnt_sb = s; + mnt->mnt_root = mntroot; + + dprintk("<-- nfs4_xdev_get_sb() = 0\n"); + return 0; + +out_err_nosb: + nfs_free_server(server); +out_err_noserver: + dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); + return error; + +error_splat_super: + up_write(&s->s_umount); + deactivate_super(s); + dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); + return error; } -static int nfs_referral_nfs4_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) +/* + * Create an NFS4 server record on referral traversal + */ +static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, + const char *dev_name, void *raw_data, + struct vfsmount *mnt) { struct nfs_clone_mount *data = raw_data; - return nfs_clone_generic_sb(data, nfs4_referral_sb, nfs4_referral_server, mnt); + struct super_block *s; + struct nfs_server *server; + struct dentry *mntroot; + struct nfs_fh mntfh; + int error; + + dprintk("--> nfs4_referral_get_sb()\n"); + + /* create a new volume representation */ + server = nfs4_create_referral_server(data, &mntfh); + if (IS_ERR(server)) { + error = PTR_ERR(server); + goto out_err_noserver; + } + + /* Get a superblock - note that we may end up sharing one that already exists */ + s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); + if (IS_ERR(s)) { + error = PTR_ERR(s); + goto out_err_nosb; + } + + if (s->s_fs_info != server) { + nfs_free_server(server); + server = NULL; + } + + if (!s->s_root) { + /* initial superblock/root creation */ + s->s_flags = flags; + nfs4_fill_super(s); + } + + mntroot = nfs4_get_root(s, data->fh); + if (IS_ERR(mntroot)) { + error = PTR_ERR(mntroot); + goto error_splat_super; + } + + s->s_flags |= MS_ACTIVE; + mnt->mnt_sb = s; + mnt->mnt_root = mntroot; + + dprintk("<-- nfs4_referral_get_sb() = 0\n"); + return 0; + +out_err_nosb: + nfs_free_server(server); +out_err_noserver: + dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); + return error; + +error_splat_super: + up_write(&s->s_umount); + deactivate_super(s); + dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); + return error; } -#endif +#endif /* CONFIG_NFS_V4 */ |