1119 lines
27 KiB
C
1119 lines
27 KiB
C
/*
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* linux/fs/nfs/super.c
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* nfs superblock handling functions
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*
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* Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
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* experimental NFS changes. Modularisation taken straight from SYS5 fs.
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*
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* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
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* J.S.Peatfield@damtp.cam.ac.uk
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*
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* Split from inode.c by David Howells <dhowells@redhat.com>
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*
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* - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
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* particular server are held in the same superblock
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* - NFS superblocks can have several effective roots to the dentry tree
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* - directory type roots are spliced into the tree when a path from one root reaches the root
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* of another (see nfs_lookup())
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/metrics.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/nfs4_mount.h>
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#include <linux/lockd/bind.h>
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#include <linux/smp_lock.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/nfs_idmap.h>
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#include <linux/vfs.h>
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#include <linux/inet.h>
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#include <linux/nfs_xdr.h>
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#include <linux/magic.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "iostat.h"
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#include "internal.h"
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#define NFSDBG_FACILITY NFSDBG_VFS
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static void nfs_umount_begin(struct vfsmount *, int);
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static int nfs_statfs(struct dentry *, struct kstatfs *);
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static int nfs_show_options(struct seq_file *, struct vfsmount *);
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static int nfs_show_stats(struct seq_file *, struct vfsmount *);
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static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
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static int nfs_xdev_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static void nfs_kill_super(struct super_block *);
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static struct file_system_type nfs_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs",
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.get_sb = nfs_get_sb,
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.kill_sb = nfs_kill_super,
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.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};
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struct file_system_type nfs_xdev_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs",
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.get_sb = nfs_xdev_get_sb,
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.kill_sb = nfs_kill_super,
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.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};
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static const struct super_operations nfs_sops = {
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.alloc_inode = nfs_alloc_inode,
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.destroy_inode = nfs_destroy_inode,
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.write_inode = nfs_write_inode,
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.statfs = nfs_statfs,
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.clear_inode = nfs_clear_inode,
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.umount_begin = nfs_umount_begin,
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.show_options = nfs_show_options,
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.show_stats = nfs_show_stats,
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};
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#ifdef CONFIG_NFS_V4
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static int nfs4_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static int nfs4_referral_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
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static void nfs4_kill_super(struct super_block *sb);
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static struct file_system_type nfs4_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs4",
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.get_sb = nfs4_get_sb,
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.kill_sb = nfs4_kill_super,
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.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};
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struct file_system_type nfs4_xdev_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs4",
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.get_sb = nfs4_xdev_get_sb,
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.kill_sb = nfs4_kill_super,
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.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};
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struct file_system_type nfs4_referral_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs4",
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.get_sb = nfs4_referral_get_sb,
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.kill_sb = nfs4_kill_super,
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.fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
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};
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static const struct super_operations nfs4_sops = {
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.alloc_inode = nfs_alloc_inode,
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.destroy_inode = nfs_destroy_inode,
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.write_inode = nfs_write_inode,
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.statfs = nfs_statfs,
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.clear_inode = nfs4_clear_inode,
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.umount_begin = nfs_umount_begin,
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.show_options = nfs_show_options,
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.show_stats = nfs_show_stats,
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};
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#endif
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static struct shrinker *acl_shrinker;
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/*
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* Register the NFS filesystems
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*/
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int __init register_nfs_fs(void)
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{
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int ret;
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ret = register_filesystem(&nfs_fs_type);
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if (ret < 0)
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goto error_0;
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ret = nfs_register_sysctl();
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if (ret < 0)
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goto error_1;
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#ifdef CONFIG_NFS_V4
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ret = register_filesystem(&nfs4_fs_type);
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if (ret < 0)
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goto error_2;
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#endif
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acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker);
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return 0;
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#ifdef CONFIG_NFS_V4
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error_2:
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nfs_unregister_sysctl();
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#endif
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error_1:
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unregister_filesystem(&nfs_fs_type);
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error_0:
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return ret;
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}
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/*
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* Unregister the NFS filesystems
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*/
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void __exit unregister_nfs_fs(void)
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{
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if (acl_shrinker != NULL)
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remove_shrinker(acl_shrinker);
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#ifdef CONFIG_NFS_V4
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unregister_filesystem(&nfs4_fs_type);
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nfs_unregister_sysctl();
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#endif
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unregister_filesystem(&nfs_fs_type);
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}
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/*
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* Deliver file system statistics to userspace
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*/
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static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct nfs_server *server = NFS_SB(dentry->d_sb);
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unsigned char blockbits;
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unsigned long blockres;
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struct nfs_fh *fh = NFS_FH(dentry->d_inode);
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struct nfs_fattr fattr;
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struct nfs_fsstat res = {
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.fattr = &fattr,
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};
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int error;
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lock_kernel();
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error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
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if (error < 0)
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goto out_err;
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buf->f_type = NFS_SUPER_MAGIC;
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/*
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* Current versions of glibc do not correctly handle the
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* case where f_frsize != f_bsize. Eventually we want to
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* report the value of wtmult in this field.
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*/
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buf->f_frsize = dentry->d_sb->s_blocksize;
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/*
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* On most *nix systems, f_blocks, f_bfree, and f_bavail
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* are reported in units of f_frsize. Linux hasn't had
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* an f_frsize field in its statfs struct until recently,
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* thus historically Linux's sys_statfs reports these
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* fields in units of f_bsize.
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*/
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buf->f_bsize = dentry->d_sb->s_blocksize;
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blockbits = dentry->d_sb->s_blocksize_bits;
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blockres = (1 << blockbits) - 1;
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buf->f_blocks = (res.tbytes + blockres) >> blockbits;
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buf->f_bfree = (res.fbytes + blockres) >> blockbits;
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buf->f_bavail = (res.abytes + blockres) >> blockbits;
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buf->f_files = res.tfiles;
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buf->f_ffree = res.afiles;
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buf->f_namelen = server->namelen;
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unlock_kernel();
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return 0;
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out_err:
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dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
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unlock_kernel();
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return error;
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}
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/*
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* Map the security flavour number to a name
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*/
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static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
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{
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static const struct {
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rpc_authflavor_t flavour;
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const char *str;
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} sec_flavours[] = {
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{ RPC_AUTH_NULL, "null" },
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{ RPC_AUTH_UNIX, "sys" },
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{ RPC_AUTH_GSS_KRB5, "krb5" },
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{ RPC_AUTH_GSS_KRB5I, "krb5i" },
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{ RPC_AUTH_GSS_KRB5P, "krb5p" },
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{ RPC_AUTH_GSS_LKEY, "lkey" },
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{ RPC_AUTH_GSS_LKEYI, "lkeyi" },
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{ RPC_AUTH_GSS_LKEYP, "lkeyp" },
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{ RPC_AUTH_GSS_SPKM, "spkm" },
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{ RPC_AUTH_GSS_SPKMI, "spkmi" },
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{ RPC_AUTH_GSS_SPKMP, "spkmp" },
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{ UINT_MAX, "unknown" }
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};
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int i;
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for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
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if (sec_flavours[i].flavour == flavour)
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break;
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}
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return sec_flavours[i].str;
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}
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/*
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* Describe the mount options in force on this server representation
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*/
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static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
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{
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static const struct proc_nfs_info {
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int flag;
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const char *str;
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const char *nostr;
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} nfs_info[] = {
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{ NFS_MOUNT_SOFT, ",soft", ",hard" },
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{ NFS_MOUNT_INTR, ",intr", "" },
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{ NFS_MOUNT_NOCTO, ",nocto", "" },
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{ NFS_MOUNT_NOAC, ",noac", "" },
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{ NFS_MOUNT_NONLM, ",nolock", "" },
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{ NFS_MOUNT_NOACL, ",noacl", "" },
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{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
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{ 0, NULL, NULL }
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};
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const struct proc_nfs_info *nfs_infop;
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struct nfs_client *clp = nfss->nfs_client;
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char buf[12];
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const char *proto;
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seq_printf(m, ",vers=%d", clp->rpc_ops->version);
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seq_printf(m, ",rsize=%d", nfss->rsize);
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seq_printf(m, ",wsize=%d", nfss->wsize);
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if (nfss->acregmin != 3*HZ || showdefaults)
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seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
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if (nfss->acregmax != 60*HZ || showdefaults)
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seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
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if (nfss->acdirmin != 30*HZ || showdefaults)
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seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
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if (nfss->acdirmax != 60*HZ || showdefaults)
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seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
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for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
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if (nfss->flags & nfs_infop->flag)
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seq_puts(m, nfs_infop->str);
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else
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seq_puts(m, nfs_infop->nostr);
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}
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switch (nfss->client->cl_xprt->prot) {
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case IPPROTO_TCP:
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proto = "tcp";
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break;
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case IPPROTO_UDP:
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proto = "udp";
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break;
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default:
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snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
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proto = buf;
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}
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seq_printf(m, ",proto=%s", proto);
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seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
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seq_printf(m, ",retrans=%u", clp->retrans_count);
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seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
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}
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/*
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* Describe the mount options on this VFS mountpoint
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*/
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static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
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{
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struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
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nfs_show_mount_options(m, nfss, 0);
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seq_puts(m, ",addr=");
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seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\");
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return 0;
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}
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/*
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* Present statistical information for this VFS mountpoint
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*/
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static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
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{
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int i, cpu;
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struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
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struct rpc_auth *auth = nfss->client->cl_auth;
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struct nfs_iostats totals = { };
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seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
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/*
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* Display all mount option settings
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*/
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seq_printf(m, "\n\topts:\t");
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seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
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seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
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seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
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seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
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nfs_show_mount_options(m, nfss, 1);
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seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
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seq_printf(m, "\n\tcaps:\t");
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seq_printf(m, "caps=0x%x", nfss->caps);
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seq_printf(m, ",wtmult=%d", nfss->wtmult);
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seq_printf(m, ",dtsize=%d", nfss->dtsize);
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seq_printf(m, ",bsize=%d", nfss->bsize);
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seq_printf(m, ",namelen=%d", nfss->namelen);
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|
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#ifdef CONFIG_NFS_V4
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if (nfss->nfs_client->cl_nfsversion == 4) {
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seq_printf(m, "\n\tnfsv4:\t");
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seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
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seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
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seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
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}
|
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#endif
|
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|
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/*
|
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* Display security flavor in effect for this mount
|
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*/
|
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seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
|
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if (auth->au_flavor)
|
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seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
|
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|
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/*
|
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* Display superblock I/O counters
|
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*/
|
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for_each_possible_cpu(cpu) {
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struct nfs_iostats *stats;
|
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|
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preempt_disable();
|
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stats = per_cpu_ptr(nfss->io_stats, cpu);
|
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|
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for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
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totals.events[i] += stats->events[i];
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for (i = 0; i < __NFSIOS_BYTESMAX; i++)
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totals.bytes[i] += stats->bytes[i];
|
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|
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preempt_enable();
|
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}
|
|
|
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seq_printf(m, "\n\tevents:\t");
|
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for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
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seq_printf(m, "%lu ", totals.events[i]);
|
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seq_printf(m, "\n\tbytes:\t");
|
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for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
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seq_printf(m, "%Lu ", totals.bytes[i]);
|
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seq_printf(m, "\n");
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|
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rpc_print_iostats(m, nfss->client);
|
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|
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return 0;
|
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}
|
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|
|
/*
|
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* Begin unmount by attempting to remove all automounted mountpoints we added
|
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* in response to xdev traversals and referrals
|
|
*/
|
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static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
|
|
{
|
|
struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
|
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struct rpc_clnt *rpc;
|
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|
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shrink_submounts(vfsmnt, &nfs_automount_list);
|
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|
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if (!(flags & MNT_FORCE))
|
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return;
|
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/* -EIO all pending I/O */
|
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rpc = server->client_acl;
|
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if (!IS_ERR(rpc))
|
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rpc_killall_tasks(rpc);
|
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rpc = server->client;
|
|
if (!IS_ERR(rpc))
|
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rpc_killall_tasks(rpc);
|
|
}
|
|
|
|
/*
|
|
* Sanity-check a server address provided by the mount command
|
|
*/
|
|
static int nfs_verify_server_address(struct sockaddr *addr)
|
|
{
|
|
switch (addr->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sa = (struct sockaddr_in *) addr;
|
|
if (sa->sin_addr.s_addr != INADDR_ANY)
|
|
return 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Validate the NFS2/NFS3 mount data
|
|
* - fills in the mount root filehandle
|
|
*/
|
|
static int nfs_validate_mount_data(struct nfs_mount_data *data,
|
|
struct nfs_fh *mntfh)
|
|
{
|
|
if (data == NULL)
|
|
goto out_no_data;
|
|
|
|
switch (data->version) {
|
|
case 1:
|
|
data->namlen = 0;
|
|
case 2:
|
|
data->bsize = 0;
|
|
case 3:
|
|
if (data->flags & NFS_MOUNT_VER3)
|
|
goto out_no_v3;
|
|
data->root.size = NFS2_FHSIZE;
|
|
memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
|
|
case 4:
|
|
if (data->flags & NFS_MOUNT_SECFLAVOUR)
|
|
goto out_no_sec;
|
|
case 5:
|
|
memset(data->context, 0, sizeof(data->context));
|
|
case 6:
|
|
if (data->flags & NFS_MOUNT_VER3)
|
|
mntfh->size = data->root.size;
|
|
else
|
|
mntfh->size = NFS2_FHSIZE;
|
|
|
|
if (mntfh->size > sizeof(mntfh->data))
|
|
goto out_invalid_fh;
|
|
|
|
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);
|
|
break;
|
|
default:
|
|
goto out_bad_version;
|
|
}
|
|
|
|
if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
|
|
data->pseudoflavor = RPC_AUTH_UNIX;
|
|
|
|
#ifndef CONFIG_NFS_V3
|
|
if (data->flags & NFS_MOUNT_VER3)
|
|
goto out_v3_not_compiled;
|
|
#endif /* !CONFIG_NFS_V3 */
|
|
|
|
if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
|
|
goto out_no_address;
|
|
|
|
return 0;
|
|
|
|
out_no_data:
|
|
dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
|
|
return -EINVAL;
|
|
|
|
out_no_v3:
|
|
dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
|
|
data->version);
|
|
return -EINVAL;
|
|
|
|
out_no_sec:
|
|
dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
|
|
return -EINVAL;
|
|
|
|
out_bad_version:
|
|
dfprintk(MOUNT, "NFS: bad nfs_mount_data version %d\n",
|
|
data->version);
|
|
return -EINVAL;
|
|
|
|
#ifndef CONFIG_NFS_V3
|
|
out_v3_not_compiled:
|
|
dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
|
|
return -EPROTONOSUPPORT;
|
|
#endif /* !CONFIG_NFS_V3 */
|
|
|
|
out_no_address:
|
|
dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
|
|
return -EINVAL;
|
|
|
|
out_invalid_fh:
|
|
dfprintk(MOUNT, "NFS: invalid root filehandle\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Initialise the common bits of the superblock
|
|
*/
|
|
static inline void nfs_initialise_sb(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
sb->s_magic = NFS_SUPER_MAGIC;
|
|
|
|
/* 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));
|
|
|
|
if (sb->s_blocksize == 0)
|
|
sb->s_blocksize = nfs_block_bits(server->wsize,
|
|
&sb->s_blocksize_bits);
|
|
|
|
if (server->flags & NFS_MOUNT_NOAC)
|
|
sb->s_flags |= MS_SYNCHRONOUS;
|
|
|
|
nfs_super_set_maxbytes(sb, server->maxfilesize);
|
|
}
|
|
|
|
/*
|
|
* Finish setting up an NFS2/3 superblock
|
|
*/
|
|
static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data)
|
|
{
|
|
struct nfs_server *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 (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;
|
|
}
|
|
|
|
sb->s_op = &nfs_sops;
|
|
nfs_initialise_sb(sb);
|
|
}
|
|
|
|
/*
|
|
* Finish setting up a cloned NFS2/3 superblock
|
|
*/
|
|
static void nfs_clone_super(struct super_block *sb,
|
|
const struct super_block *old_sb)
|
|
{
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
sb->s_op = old_sb->s_op;
|
|
nfs_initialise_sb(sb);
|
|
}
|
|
|
|
static int nfs_set_super(struct super_block *s, void *_server)
|
|
{
|
|
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, *old = NFS_SB(sb);
|
|
|
|
if (old->nfs_client != server->nfs_client)
|
|
return 0;
|
|
if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
|
|
return 0;
|
|
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)
|
|
{
|
|
struct nfs_server *server = NULL;
|
|
struct super_block *s;
|
|
struct nfs_fh mntfh;
|
|
struct nfs_mount_data *data = raw_data;
|
|
struct dentry *mntroot;
|
|
int error;
|
|
|
|
/* Validate the mount data */
|
|
error = nfs_validate_mount_data(data, &mntfh);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
/* Get a volume representation */
|
|
server = nfs_create_server(data, &mntfh);
|
|
if (IS_ERR(server)) {
|
|
error = PTR_ERR(server);
|
|
goto out;
|
|
}
|
|
|
|
/* 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_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;
|
|
nfs_fill_super(s, data);
|
|
}
|
|
|
|
mntroot = nfs_get_root(s, &mntfh);
|
|
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;
|
|
error = 0;
|
|
|
|
out:
|
|
return error;
|
|
|
|
out_err_nosb:
|
|
nfs_free_server(server);
|
|
goto out;
|
|
|
|
error_splat_super:
|
|
up_write(&s->s_umount);
|
|
deactivate_super(s);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
nfs_free_server(server);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
struct super_block *s;
|
|
struct nfs_server *server;
|
|
struct dentry *mntroot;
|
|
int error;
|
|
|
|
dprintk("--> nfs_xdev_get_sb()\n");
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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;
|
|
nfs_clone_super(s, data->sb);
|
|
}
|
|
|
|
mntroot = nfs_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("<-- nfs_xdev_get_sb() = 0\n");
|
|
return 0;
|
|
|
|
out_err_nosb:
|
|
nfs_free_server(server);
|
|
out_err_noserver:
|
|
dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
|
|
return error;
|
|
|
|
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
|
|
|
|
/*
|
|
* Finish setting up a cloned NFS4 superblock
|
|
*/
|
|
static void nfs4_clone_super(struct super_block *sb,
|
|
const struct super_block *old_sb)
|
|
{
|
|
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 = old_sb->s_op;
|
|
nfs_initialise_sb(sb);
|
|
}
|
|
|
|
/*
|
|
* Set up an NFS4 superblock
|
|
*/
|
|
static void nfs4_fill_super(struct super_block *sb)
|
|
{
|
|
sb->s_time_gran = 1;
|
|
sb->s_op = &nfs4_sops;
|
|
nfs_initialise_sb(sb);
|
|
}
|
|
|
|
/*
|
|
* Validate NFSv4 mount options
|
|
*/
|
|
static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
|
|
const char *dev_name,
|
|
struct sockaddr_in *addr,
|
|
rpc_authflavor_t *authflavour,
|
|
char **hostname,
|
|
char **mntpath,
|
|
char **ip_addr)
|
|
{
|
|
struct nfs4_mount_data *data = *options;
|
|
char *c;
|
|
|
|
if (data == NULL)
|
|
goto out_no_data;
|
|
|
|
switch (data->version) {
|
|
case 1:
|
|
if (data->host_addrlen != sizeof(*addr))
|
|
goto out_no_address;
|
|
if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
|
|
return -EFAULT;
|
|
if (addr->sin_port == 0)
|
|
addr->sin_port = htons(NFS_PORT);
|
|
if (!nfs_verify_server_address((struct sockaddr *) addr))
|
|
goto out_no_address;
|
|
|
|
switch (data->auth_flavourlen) {
|
|
case 0:
|
|
*authflavour = RPC_AUTH_UNIX;
|
|
break;
|
|
case 1:
|
|
if (copy_from_user(authflavour, data->auth_flavours,
|
|
sizeof(*authflavour)))
|
|
return -EFAULT;
|
|
break;
|
|
default:
|
|
goto out_inval_auth;
|
|
}
|
|
|
|
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
|
|
if (IS_ERR(c))
|
|
return PTR_ERR(c);
|
|
*hostname = c;
|
|
|
|
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
|
|
if (IS_ERR(c))
|
|
return PTR_ERR(c);
|
|
*mntpath = c;
|
|
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath);
|
|
|
|
c = strndup_user(data->client_addr.data, 16);
|
|
if (IS_ERR(c))
|
|
return PTR_ERR(c);
|
|
*ip_addr = c;
|
|
|
|
break;
|
|
default:
|
|
goto out_bad_version;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_no_data:
|
|
dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
|
|
return -EINVAL;
|
|
|
|
out_inval_auth:
|
|
dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
|
|
data->auth_flavourlen);
|
|
return -EINVAL;
|
|
|
|
out_no_address:
|
|
dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
|
|
return -EINVAL;
|
|
|
|
out_bad_version:
|
|
dfprintk(MOUNT, "NFS4: bad nfs_mount_data version %d\n",
|
|
data->version);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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 = NULL;
|
|
int error;
|
|
|
|
/* Validate the mount data */
|
|
error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
|
|
&hostname, &mntpath, &ip_addr);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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_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, &mntfh);
|
|
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;
|
|
error = 0;
|
|
|
|
out:
|
|
kfree(ip_addr);
|
|
kfree(mntpath);
|
|
kfree(hostname);
|
|
return error;
|
|
|
|
out_free:
|
|
nfs_free_server(server);
|
|
goto out;
|
|
|
|
error_splat_super:
|
|
up_write(&s->s_umount);
|
|
deactivate_super(s);
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
nfs_free_server(server);
|
|
}
|
|
|
|
/*
|
|
* Clone an NFS4 server record on xdev traversal (FSID-change)
|
|
*/
|
|
static int nfs4_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;
|
|
struct super_block *s;
|
|
struct nfs_server *server;
|
|
struct dentry *mntroot;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_xdev_get_sb()\n");
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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_clone_super(s, data->sb);
|
|
}
|
|
|
|
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_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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
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, &mntfh);
|
|
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 /* CONFIG_NFS_V4 */
|