mirror of
https://github.com/edk2-porting/linux-next.git
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763008c435
* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6: NFS: Fix an Oops in the NFSv4 atomic open code NFS: Fix the selection of security flavours in Kconfig NFS: fix the return value of nfs_file_fsync() rpcrdma: Fix SQ size calculation when memreg is FRMR xprtrdma: Do not truncate iova_start values in frmr registrations. nfs: Remove redundant NULL check upon kfree() nfs: Add "lookupcache" to displayed mount options NFS: allow close-to-open cache semantics to apply to root of NFS filesystem SUNRPC: fix NFS client over TCP hangs due to packet loss (Bug 16494)
3103 lines
77 KiB
C
3103 lines
77 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@lxorguk.ukuu.org.uk>, 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/sunrpc/xprtsock.h>
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#include <linux/sunrpc/xprtrdma.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/mnt_namespace.h>
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#include <linux/namei.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/in6.h>
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#include <linux/slab.h>
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#include <net/ipv6.h>
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#include <linux/netdevice.h>
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#include <linux/nfs_xdr.h>
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#include <linux/magic.h>
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#include <linux/parser.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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#include "fscache.h"
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#define NFSDBG_FACILITY NFSDBG_VFS
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enum {
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/* Mount options that take no arguments */
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Opt_soft, Opt_hard,
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Opt_posix, Opt_noposix,
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Opt_cto, Opt_nocto,
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Opt_ac, Opt_noac,
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Opt_lock, Opt_nolock,
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Opt_v2, Opt_v3, Opt_v4,
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Opt_udp, Opt_tcp, Opt_rdma,
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Opt_acl, Opt_noacl,
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Opt_rdirplus, Opt_nordirplus,
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Opt_sharecache, Opt_nosharecache,
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Opt_resvport, Opt_noresvport,
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Opt_fscache, Opt_nofscache,
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/* Mount options that take integer arguments */
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Opt_port,
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Opt_rsize, Opt_wsize, Opt_bsize,
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Opt_timeo, Opt_retrans,
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Opt_acregmin, Opt_acregmax,
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Opt_acdirmin, Opt_acdirmax,
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Opt_actimeo,
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Opt_namelen,
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Opt_mountport,
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Opt_mountvers,
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Opt_nfsvers,
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Opt_minorversion,
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/* Mount options that take string arguments */
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Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
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Opt_addr, Opt_mountaddr, Opt_clientaddr,
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Opt_lookupcache,
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Opt_fscache_uniq,
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/* Special mount options */
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Opt_userspace, Opt_deprecated, Opt_sloppy,
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Opt_err
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};
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static const match_table_t nfs_mount_option_tokens = {
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{ Opt_userspace, "bg" },
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{ Opt_userspace, "fg" },
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{ Opt_userspace, "retry=%s" },
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{ Opt_sloppy, "sloppy" },
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{ Opt_soft, "soft" },
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{ Opt_hard, "hard" },
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{ Opt_deprecated, "intr" },
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{ Opt_deprecated, "nointr" },
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{ Opt_posix, "posix" },
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{ Opt_noposix, "noposix" },
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{ Opt_cto, "cto" },
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{ Opt_nocto, "nocto" },
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{ Opt_ac, "ac" },
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{ Opt_noac, "noac" },
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{ Opt_lock, "lock" },
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{ Opt_nolock, "nolock" },
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{ Opt_v2, "v2" },
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{ Opt_v3, "v3" },
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{ Opt_v4, "v4" },
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{ Opt_udp, "udp" },
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{ Opt_tcp, "tcp" },
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{ Opt_rdma, "rdma" },
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{ Opt_acl, "acl" },
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{ Opt_noacl, "noacl" },
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{ Opt_rdirplus, "rdirplus" },
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{ Opt_nordirplus, "nordirplus" },
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{ Opt_sharecache, "sharecache" },
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{ Opt_nosharecache, "nosharecache" },
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{ Opt_resvport, "resvport" },
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{ Opt_noresvport, "noresvport" },
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{ Opt_fscache, "fsc" },
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{ Opt_nofscache, "nofsc" },
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{ Opt_port, "port=%s" },
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{ Opt_rsize, "rsize=%s" },
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{ Opt_wsize, "wsize=%s" },
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{ Opt_bsize, "bsize=%s" },
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{ Opt_timeo, "timeo=%s" },
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{ Opt_retrans, "retrans=%s" },
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{ Opt_acregmin, "acregmin=%s" },
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{ Opt_acregmax, "acregmax=%s" },
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{ Opt_acdirmin, "acdirmin=%s" },
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{ Opt_acdirmax, "acdirmax=%s" },
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{ Opt_actimeo, "actimeo=%s" },
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{ Opt_namelen, "namlen=%s" },
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{ Opt_mountport, "mountport=%s" },
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{ Opt_mountvers, "mountvers=%s" },
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{ Opt_nfsvers, "nfsvers=%s" },
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{ Opt_nfsvers, "vers=%s" },
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{ Opt_minorversion, "minorversion=%s" },
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{ Opt_sec, "sec=%s" },
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{ Opt_proto, "proto=%s" },
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{ Opt_mountproto, "mountproto=%s" },
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{ Opt_addr, "addr=%s" },
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{ Opt_clientaddr, "clientaddr=%s" },
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{ Opt_mounthost, "mounthost=%s" },
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{ Opt_mountaddr, "mountaddr=%s" },
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{ Opt_lookupcache, "lookupcache=%s" },
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{ Opt_fscache_uniq, "fsc=%s" },
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{ Opt_err, NULL }
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};
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enum {
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Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
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Opt_xprt_err
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};
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static const match_table_t nfs_xprt_protocol_tokens = {
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{ Opt_xprt_udp, "udp" },
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{ Opt_xprt_udp6, "udp6" },
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{ Opt_xprt_tcp, "tcp" },
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{ Opt_xprt_tcp6, "tcp6" },
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{ Opt_xprt_rdma, "rdma" },
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{ Opt_xprt_err, NULL }
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};
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enum {
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Opt_sec_none, Opt_sec_sys,
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Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
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Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
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Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
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Opt_sec_err
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};
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static const match_table_t nfs_secflavor_tokens = {
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{ Opt_sec_none, "none" },
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{ Opt_sec_none, "null" },
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{ Opt_sec_sys, "sys" },
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{ Opt_sec_krb5, "krb5" },
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{ Opt_sec_krb5i, "krb5i" },
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{ Opt_sec_krb5p, "krb5p" },
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{ Opt_sec_lkey, "lkey" },
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{ Opt_sec_lkeyi, "lkeyi" },
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{ Opt_sec_lkeyp, "lkeyp" },
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{ Opt_sec_spkm, "spkm3" },
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{ Opt_sec_spkmi, "spkm3i" },
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{ Opt_sec_spkmp, "spkm3p" },
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{ Opt_sec_err, NULL }
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};
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enum {
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Opt_lookupcache_all, Opt_lookupcache_positive,
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Opt_lookupcache_none,
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Opt_lookupcache_err
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};
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static match_table_t nfs_lookupcache_tokens = {
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{ Opt_lookupcache_all, "all" },
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{ Opt_lookupcache_positive, "pos" },
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{ Opt_lookupcache_positive, "positive" },
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{ Opt_lookupcache_none, "none" },
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{ Opt_lookupcache_err, NULL }
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};
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static void nfs_umount_begin(struct super_block *);
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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_put_super(struct super_block *);
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static void nfs_kill_super(struct super_block *);
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static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
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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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.put_super = nfs_put_super,
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.statfs = nfs_statfs,
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.evict_inode = nfs_evict_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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.remount_fs = nfs_remount,
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};
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#ifdef CONFIG_NFS_V4
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static int nfs4_validate_text_mount_data(void *options,
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struct nfs_parsed_mount_data *args, const char *dev_name);
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static int nfs4_try_mount(int flags, const char *dev_name,
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struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
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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_remote_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 int nfs4_remote_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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static struct file_system_type nfs4_remote_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs4",
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.get_sb = nfs4_remote_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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static struct file_system_type nfs4_remote_referral_fs_type = {
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.owner = THIS_MODULE,
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.name = "nfs4",
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.get_sb = nfs4_remote_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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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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.put_super = nfs_put_super,
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.statfs = nfs_statfs,
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.evict_inode = nfs4_evict_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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.remount_fs = nfs_remount,
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};
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#endif
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static struct shrinker acl_shrinker = {
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.shrink = nfs_access_cache_shrinker,
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.seeks = DEFAULT_SEEKS,
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};
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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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register_shrinker(&acl_shrinker);
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return 0;
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|
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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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unregister_shrinker(&acl_shrinker);
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#ifdef CONFIG_NFS_V4
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unregister_filesystem(&nfs4_fs_type);
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#endif
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nfs_unregister_sysctl();
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unregister_filesystem(&nfs_fs_type);
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}
|
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|
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void nfs_sb_active(struct super_block *sb)
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{
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struct nfs_server *server = NFS_SB(sb);
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|
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if (atomic_inc_return(&server->active) == 1)
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atomic_inc(&sb->s_active);
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}
|
|
|
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void nfs_sb_deactive(struct super_block *sb)
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{
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struct nfs_server *server = NFS_SB(sb);
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|
|
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if (atomic_dec_and_test(&server->active))
|
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deactivate_super(sb);
|
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}
|
|
|
|
/*
|
|
* Deliver file system statistics to userspace
|
|
*/
|
|
static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct nfs_server *server = NFS_SB(dentry->d_sb);
|
|
unsigned char blockbits;
|
|
unsigned long blockres;
|
|
struct nfs_fh *fh = NFS_FH(dentry->d_inode);
|
|
struct nfs_fsstat res;
|
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int error = -ENOMEM;
|
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|
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res.fattr = nfs_alloc_fattr();
|
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if (res.fattr == NULL)
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goto out_err;
|
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|
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error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
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|
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nfs_free_fattr(res.fattr);
|
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if (error < 0)
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goto out_err;
|
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|
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buf->f_type = NFS_SUPER_MAGIC;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
buf->f_frsize = dentry->d_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 = dentry->d_sb->s_blocksize;
|
|
blockbits = dentry->d_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;
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
dprintk("%s: statfs error = %d\n", __func__, -error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Map the security flavour number to a name
|
|
*/
|
|
static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
|
|
{
|
|
static const struct {
|
|
rpc_authflavor_t flavour;
|
|
const char *str;
|
|
} sec_flavours[] = {
|
|
{ RPC_AUTH_NULL, "null" },
|
|
{ RPC_AUTH_UNIX, "sys" },
|
|
{ RPC_AUTH_GSS_KRB5, "krb5" },
|
|
{ RPC_AUTH_GSS_KRB5I, "krb5i" },
|
|
{ RPC_AUTH_GSS_KRB5P, "krb5p" },
|
|
{ RPC_AUTH_GSS_LKEY, "lkey" },
|
|
{ RPC_AUTH_GSS_LKEYI, "lkeyi" },
|
|
{ RPC_AUTH_GSS_LKEYP, "lkeyp" },
|
|
{ RPC_AUTH_GSS_SPKM, "spkm" },
|
|
{ RPC_AUTH_GSS_SPKMI, "spkmi" },
|
|
{ RPC_AUTH_GSS_SPKMP, "spkmp" },
|
|
{ UINT_MAX, "unknown" }
|
|
};
|
|
int i;
|
|
|
|
for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
|
|
if (sec_flavours[i].flavour == flavour)
|
|
break;
|
|
}
|
|
return sec_flavours[i].str;
|
|
}
|
|
|
|
static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
|
|
|
|
seq_printf(m, ",mountproto=");
|
|
switch (sap->sa_family) {
|
|
case AF_INET:
|
|
switch (nfss->mountd_protocol) {
|
|
case IPPROTO_UDP:
|
|
seq_printf(m, RPCBIND_NETID_UDP);
|
|
break;
|
|
case IPPROTO_TCP:
|
|
seq_printf(m, RPCBIND_NETID_TCP);
|
|
break;
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, "auto");
|
|
}
|
|
break;
|
|
case AF_INET6:
|
|
switch (nfss->mountd_protocol) {
|
|
case IPPROTO_UDP:
|
|
seq_printf(m, RPCBIND_NETID_UDP6);
|
|
break;
|
|
case IPPROTO_TCP:
|
|
seq_printf(m, RPCBIND_NETID_TCP6);
|
|
break;
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, "auto");
|
|
}
|
|
break;
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, "auto");
|
|
}
|
|
}
|
|
|
|
static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
|
|
|
|
if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
|
|
return;
|
|
|
|
switch (sap->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)sap;
|
|
seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
|
|
seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
|
|
break;
|
|
}
|
|
default:
|
|
if (showdefaults)
|
|
seq_printf(m, ",mountaddr=unspecified");
|
|
}
|
|
|
|
if (nfss->mountd_version || showdefaults)
|
|
seq_printf(m, ",mountvers=%u", nfss->mountd_version);
|
|
if (nfss->mountd_port || showdefaults)
|
|
seq_printf(m, ",mountport=%u", nfss->mountd_port);
|
|
|
|
nfs_show_mountd_netid(m, nfss, showdefaults);
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
struct nfs_client *clp = nfss->nfs_client;
|
|
|
|
seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
|
|
seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
|
|
}
|
|
#else
|
|
static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Describe the mount options in force on this server representation
|
|
*/
|
|
static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
|
|
int showdefaults)
|
|
{
|
|
static const struct proc_nfs_info {
|
|
int flag;
|
|
const char *str;
|
|
const char *nostr;
|
|
} nfs_info[] = {
|
|
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
|
|
{ NFS_MOUNT_POSIX, ",posix", "" },
|
|
{ NFS_MOUNT_NOCTO, ",nocto", "" },
|
|
{ NFS_MOUNT_NOAC, ",noac", "" },
|
|
{ NFS_MOUNT_NONLM, ",nolock", "" },
|
|
{ NFS_MOUNT_NOACL, ",noacl", "" },
|
|
{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
|
|
{ NFS_MOUNT_UNSHARED, ",nosharecache", "" },
|
|
{ NFS_MOUNT_NORESVPORT, ",noresvport", "" },
|
|
{ 0, NULL, NULL }
|
|
};
|
|
const struct proc_nfs_info *nfs_infop;
|
|
struct nfs_client *clp = nfss->nfs_client;
|
|
u32 version = clp->rpc_ops->version;
|
|
|
|
seq_printf(m, ",vers=%u", version);
|
|
seq_printf(m, ",rsize=%u", nfss->rsize);
|
|
seq_printf(m, ",wsize=%u", nfss->wsize);
|
|
if (nfss->bsize != 0)
|
|
seq_printf(m, ",bsize=%u", nfss->bsize);
|
|
seq_printf(m, ",namlen=%u", nfss->namelen);
|
|
if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
|
|
seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
|
|
if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
|
|
seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
|
|
if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
|
|
seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
|
|
if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
|
|
seq_printf(m, ",acdirmax=%u", 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_printf(m, ",proto=%s",
|
|
rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
|
|
if (version == 4) {
|
|
if (nfss->port != NFS_PORT)
|
|
seq_printf(m, ",port=%u", nfss->port);
|
|
} else
|
|
if (nfss->port)
|
|
seq_printf(m, ",port=%u", nfss->port);
|
|
|
|
seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
|
|
seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
|
|
seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
|
|
|
|
if (version != 4)
|
|
nfs_show_mountd_options(m, nfss, showdefaults);
|
|
else
|
|
nfs_show_nfsv4_options(m, nfss, showdefaults);
|
|
|
|
if (nfss->options & NFS_OPTION_FSCACHE)
|
|
seq_printf(m, ",fsc");
|
|
|
|
if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
|
|
if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
|
|
seq_printf(m, ",lookupcache=none");
|
|
else
|
|
seq_printf(m, ",lookupcache=pos");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Describe the mount options on this VFS mountpoint
|
|
*/
|
|
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
|
|
{
|
|
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
|
|
|
|
nfs_show_mount_options(m, nfss, 0);
|
|
|
|
seq_printf(m, ",addr=%s",
|
|
rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
|
|
RPC_DISPLAY_ADDR));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Present statistical information for this VFS mountpoint
|
|
*/
|
|
static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
|
|
{
|
|
int i, cpu;
|
|
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
|
|
struct rpc_auth *auth = nfss->client->cl_auth;
|
|
struct nfs_iostats totals = { };
|
|
|
|
seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
|
|
|
|
/*
|
|
* Display all mount option settings
|
|
*/
|
|
seq_printf(m, "\n\topts:\t");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
|
|
seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
|
|
nfs_show_mount_options(m, nfss, 1);
|
|
|
|
seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
|
|
|
|
seq_printf(m, "\n\tcaps:\t");
|
|
seq_printf(m, "caps=0x%x", nfss->caps);
|
|
seq_printf(m, ",wtmult=%u", nfss->wtmult);
|
|
seq_printf(m, ",dtsize=%u", nfss->dtsize);
|
|
seq_printf(m, ",bsize=%u", nfss->bsize);
|
|
seq_printf(m, ",namlen=%u", nfss->namelen);
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
if (nfss->nfs_client->rpc_ops->version == 4) {
|
|
seq_printf(m, "\n\tnfsv4:\t");
|
|
seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
|
|
seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
|
|
seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Display security flavor in effect for this mount
|
|
*/
|
|
seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
|
|
if (auth->au_flavor)
|
|
seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
|
|
|
|
/*
|
|
* Display superblock I/O counters
|
|
*/
|
|
for_each_possible_cpu(cpu) {
|
|
struct nfs_iostats *stats;
|
|
|
|
preempt_disable();
|
|
stats = per_cpu_ptr(nfss->io_stats, cpu);
|
|
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
|
totals.events[i] += stats->events[i];
|
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
|
totals.bytes[i] += stats->bytes[i];
|
|
#ifdef CONFIG_NFS_FSCACHE
|
|
for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
|
|
totals.fscache[i] += stats->fscache[i];
|
|
#endif
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
seq_printf(m, "\n\tevents:\t");
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
|
|
seq_printf(m, "%lu ", totals.events[i]);
|
|
seq_printf(m, "\n\tbytes:\t");
|
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++)
|
|
seq_printf(m, "%Lu ", totals.bytes[i]);
|
|
#ifdef CONFIG_NFS_FSCACHE
|
|
if (nfss->options & NFS_OPTION_FSCACHE) {
|
|
seq_printf(m, "\n\tfsc:\t");
|
|
for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
|
|
seq_printf(m, "%Lu ", totals.bytes[i]);
|
|
}
|
|
#endif
|
|
seq_printf(m, "\n");
|
|
|
|
rpc_print_iostats(m, nfss->client);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Begin unmount by attempting to remove all automounted mountpoints we added
|
|
* in response to xdev traversals and referrals
|
|
*/
|
|
static void nfs_umount_begin(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server;
|
|
struct rpc_clnt *rpc;
|
|
|
|
server = NFS_SB(sb);
|
|
/* -EIO all pending I/O */
|
|
rpc = server->client_acl;
|
|
if (!IS_ERR(rpc))
|
|
rpc_killall_tasks(rpc);
|
|
rpc = server->client;
|
|
if (!IS_ERR(rpc))
|
|
rpc_killall_tasks(rpc);
|
|
}
|
|
|
|
static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
|
|
{
|
|
struct nfs_parsed_mount_data *data;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (data) {
|
|
data->acregmin = NFS_DEF_ACREGMIN;
|
|
data->acregmax = NFS_DEF_ACREGMAX;
|
|
data->acdirmin = NFS_DEF_ACDIRMIN;
|
|
data->acdirmax = NFS_DEF_ACDIRMAX;
|
|
data->mount_server.port = NFS_UNSPEC_PORT;
|
|
data->nfs_server.port = NFS_UNSPEC_PORT;
|
|
data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
|
|
data->auth_flavors[0] = RPC_AUTH_UNIX;
|
|
data->auth_flavor_len = 1;
|
|
data->version = version;
|
|
data->minorversion = 0;
|
|
}
|
|
return data;
|
|
}
|
|
|
|
/*
|
|
* Sanity-check a server address provided by the mount command.
|
|
*
|
|
* Address family must be initialized, and address must not be
|
|
* the ANY address for that family.
|
|
*/
|
|
static int nfs_verify_server_address(struct sockaddr *addr)
|
|
{
|
|
switch (addr->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sa = (struct sockaddr_in *)addr;
|
|
return sa->sin_addr.s_addr != htonl(INADDR_ANY);
|
|
}
|
|
case AF_INET6: {
|
|
struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
|
|
return !ipv6_addr_any(sa);
|
|
}
|
|
}
|
|
|
|
dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Select between a default port value and a user-specified port value.
|
|
* If a zero value is set, then autobind will be used.
|
|
*/
|
|
static void nfs_set_port(struct sockaddr *sap, int *port,
|
|
const unsigned short default_port)
|
|
{
|
|
if (*port == NFS_UNSPEC_PORT)
|
|
*port = default_port;
|
|
|
|
rpc_set_port(sap, *port);
|
|
}
|
|
|
|
/*
|
|
* Sanity check the NFS transport protocol.
|
|
*
|
|
*/
|
|
static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
|
|
{
|
|
switch (mnt->nfs_server.protocol) {
|
|
case XPRT_TRANSPORT_UDP:
|
|
case XPRT_TRANSPORT_TCP:
|
|
case XPRT_TRANSPORT_RDMA:
|
|
break;
|
|
default:
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For text based NFSv2/v3 mounts, the mount protocol transport default
|
|
* settings should depend upon the specified NFS transport.
|
|
*/
|
|
static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
|
|
{
|
|
nfs_validate_transport_protocol(mnt);
|
|
|
|
if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
|
|
mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
|
|
return;
|
|
switch (mnt->nfs_server.protocol) {
|
|
case XPRT_TRANSPORT_UDP:
|
|
mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
|
|
break;
|
|
case XPRT_TRANSPORT_TCP:
|
|
case XPRT_TRANSPORT_RDMA:
|
|
mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Parse the value of the 'sec=' option.
|
|
*/
|
|
static int nfs_parse_security_flavors(char *value,
|
|
struct nfs_parsed_mount_data *mnt)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
|
|
dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
|
|
|
|
switch (match_token(value, nfs_secflavor_tokens, args)) {
|
|
case Opt_sec_none:
|
|
mnt->auth_flavors[0] = RPC_AUTH_NULL;
|
|
break;
|
|
case Opt_sec_sys:
|
|
mnt->auth_flavors[0] = RPC_AUTH_UNIX;
|
|
break;
|
|
case Opt_sec_krb5:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
|
|
break;
|
|
case Opt_sec_krb5i:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
|
|
break;
|
|
case Opt_sec_krb5p:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
|
|
break;
|
|
case Opt_sec_lkey:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
|
|
break;
|
|
case Opt_sec_lkeyi:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
|
|
break;
|
|
case Opt_sec_lkeyp:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
|
|
break;
|
|
case Opt_sec_spkm:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
|
|
break;
|
|
case Opt_sec_spkmi:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
|
|
break;
|
|
case Opt_sec_spkmp:
|
|
mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
mnt->auth_flavor_len = 1;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Error-check and convert a string of mount options from user space into
|
|
* a data structure. The whole mount string is processed; bad options are
|
|
* skipped as they are encountered. If there were no errors, return 1;
|
|
* otherwise return 0 (zero).
|
|
*/
|
|
static int nfs_parse_mount_options(char *raw,
|
|
struct nfs_parsed_mount_data *mnt)
|
|
{
|
|
char *p, *string, *secdata;
|
|
int rc, sloppy = 0, invalid_option = 0;
|
|
unsigned short protofamily = AF_UNSPEC;
|
|
unsigned short mountfamily = AF_UNSPEC;
|
|
|
|
if (!raw) {
|
|
dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
|
|
return 1;
|
|
}
|
|
dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
|
|
|
|
secdata = alloc_secdata();
|
|
if (!secdata)
|
|
goto out_nomem;
|
|
|
|
rc = security_sb_copy_data(raw, secdata);
|
|
if (rc)
|
|
goto out_security_failure;
|
|
|
|
rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
|
|
if (rc)
|
|
goto out_security_failure;
|
|
|
|
free_secdata(secdata);
|
|
|
|
while ((p = strsep(&raw, ",")) != NULL) {
|
|
substring_t args[MAX_OPT_ARGS];
|
|
unsigned long option;
|
|
int token;
|
|
|
|
if (!*p)
|
|
continue;
|
|
|
|
dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
|
|
|
|
token = match_token(p, nfs_mount_option_tokens, args);
|
|
switch (token) {
|
|
|
|
/*
|
|
* boolean options: foo/nofoo
|
|
*/
|
|
case Opt_soft:
|
|
mnt->flags |= NFS_MOUNT_SOFT;
|
|
break;
|
|
case Opt_hard:
|
|
mnt->flags &= ~NFS_MOUNT_SOFT;
|
|
break;
|
|
case Opt_posix:
|
|
mnt->flags |= NFS_MOUNT_POSIX;
|
|
break;
|
|
case Opt_noposix:
|
|
mnt->flags &= ~NFS_MOUNT_POSIX;
|
|
break;
|
|
case Opt_cto:
|
|
mnt->flags &= ~NFS_MOUNT_NOCTO;
|
|
break;
|
|
case Opt_nocto:
|
|
mnt->flags |= NFS_MOUNT_NOCTO;
|
|
break;
|
|
case Opt_ac:
|
|
mnt->flags &= ~NFS_MOUNT_NOAC;
|
|
break;
|
|
case Opt_noac:
|
|
mnt->flags |= NFS_MOUNT_NOAC;
|
|
break;
|
|
case Opt_lock:
|
|
mnt->flags &= ~NFS_MOUNT_NONLM;
|
|
break;
|
|
case Opt_nolock:
|
|
mnt->flags |= NFS_MOUNT_NONLM;
|
|
break;
|
|
case Opt_v2:
|
|
mnt->flags &= ~NFS_MOUNT_VER3;
|
|
mnt->version = 2;
|
|
break;
|
|
case Opt_v3:
|
|
mnt->flags |= NFS_MOUNT_VER3;
|
|
mnt->version = 3;
|
|
break;
|
|
#ifdef CONFIG_NFS_V4
|
|
case Opt_v4:
|
|
mnt->flags &= ~NFS_MOUNT_VER3;
|
|
mnt->version = 4;
|
|
break;
|
|
#endif
|
|
case Opt_udp:
|
|
mnt->flags &= ~NFS_MOUNT_TCP;
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
|
|
break;
|
|
case Opt_tcp:
|
|
mnt->flags |= NFS_MOUNT_TCP;
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
|
|
break;
|
|
case Opt_rdma:
|
|
mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
|
|
xprt_load_transport(p);
|
|
break;
|
|
case Opt_acl:
|
|
mnt->flags &= ~NFS_MOUNT_NOACL;
|
|
break;
|
|
case Opt_noacl:
|
|
mnt->flags |= NFS_MOUNT_NOACL;
|
|
break;
|
|
case Opt_rdirplus:
|
|
mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
|
|
break;
|
|
case Opt_nordirplus:
|
|
mnt->flags |= NFS_MOUNT_NORDIRPLUS;
|
|
break;
|
|
case Opt_sharecache:
|
|
mnt->flags &= ~NFS_MOUNT_UNSHARED;
|
|
break;
|
|
case Opt_nosharecache:
|
|
mnt->flags |= NFS_MOUNT_UNSHARED;
|
|
break;
|
|
case Opt_resvport:
|
|
mnt->flags &= ~NFS_MOUNT_NORESVPORT;
|
|
break;
|
|
case Opt_noresvport:
|
|
mnt->flags |= NFS_MOUNT_NORESVPORT;
|
|
break;
|
|
case Opt_fscache:
|
|
mnt->options |= NFS_OPTION_FSCACHE;
|
|
kfree(mnt->fscache_uniq);
|
|
mnt->fscache_uniq = NULL;
|
|
break;
|
|
case Opt_nofscache:
|
|
mnt->options &= ~NFS_OPTION_FSCACHE;
|
|
kfree(mnt->fscache_uniq);
|
|
mnt->fscache_uniq = NULL;
|
|
break;
|
|
|
|
/*
|
|
* options that take numeric values
|
|
*/
|
|
case Opt_port:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0 || option > USHRT_MAX)
|
|
goto out_invalid_value;
|
|
mnt->nfs_server.port = option;
|
|
break;
|
|
case Opt_rsize:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->rsize = option;
|
|
break;
|
|
case Opt_wsize:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->wsize = option;
|
|
break;
|
|
case Opt_bsize:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->bsize = option;
|
|
break;
|
|
case Opt_timeo:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0 || option == 0)
|
|
goto out_invalid_value;
|
|
mnt->timeo = option;
|
|
break;
|
|
case Opt_retrans:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0 || option == 0)
|
|
goto out_invalid_value;
|
|
mnt->retrans = option;
|
|
break;
|
|
case Opt_acregmin:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->acregmin = option;
|
|
break;
|
|
case Opt_acregmax:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->acregmax = option;
|
|
break;
|
|
case Opt_acdirmin:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->acdirmin = option;
|
|
break;
|
|
case Opt_acdirmax:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->acdirmax = option;
|
|
break;
|
|
case Opt_actimeo:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->acregmin = mnt->acregmax =
|
|
mnt->acdirmin = mnt->acdirmax = option;
|
|
break;
|
|
case Opt_namelen:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
mnt->namlen = option;
|
|
break;
|
|
case Opt_mountport:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0 || option > USHRT_MAX)
|
|
goto out_invalid_value;
|
|
mnt->mount_server.port = option;
|
|
break;
|
|
case Opt_mountvers:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0 ||
|
|
option < NFS_MNT_VERSION ||
|
|
option > NFS_MNT3_VERSION)
|
|
goto out_invalid_value;
|
|
mnt->mount_server.version = option;
|
|
break;
|
|
case Opt_nfsvers:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
switch (option) {
|
|
case NFS2_VERSION:
|
|
mnt->flags &= ~NFS_MOUNT_VER3;
|
|
mnt->version = 2;
|
|
break;
|
|
case NFS3_VERSION:
|
|
mnt->flags |= NFS_MOUNT_VER3;
|
|
mnt->version = 3;
|
|
break;
|
|
#ifdef CONFIG_NFS_V4
|
|
case NFS4_VERSION:
|
|
mnt->flags &= ~NFS_MOUNT_VER3;
|
|
mnt->version = 4;
|
|
break;
|
|
#endif
|
|
default:
|
|
goto out_invalid_value;
|
|
}
|
|
break;
|
|
case Opt_minorversion:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = strict_strtoul(string, 10, &option);
|
|
kfree(string);
|
|
if (rc != 0)
|
|
goto out_invalid_value;
|
|
if (option > NFS4_MAX_MINOR_VERSION)
|
|
goto out_invalid_value;
|
|
mnt->minorversion = option;
|
|
break;
|
|
|
|
/*
|
|
* options that take text values
|
|
*/
|
|
case Opt_sec:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
rc = nfs_parse_security_flavors(string, mnt);
|
|
kfree(string);
|
|
if (!rc) {
|
|
dfprintk(MOUNT, "NFS: unrecognized "
|
|
"security flavor\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case Opt_proto:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
token = match_token(string,
|
|
nfs_xprt_protocol_tokens, args);
|
|
|
|
protofamily = AF_INET;
|
|
switch (token) {
|
|
case Opt_xprt_udp6:
|
|
protofamily = AF_INET6;
|
|
case Opt_xprt_udp:
|
|
mnt->flags &= ~NFS_MOUNT_TCP;
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
|
|
kfree(string);
|
|
break;
|
|
case Opt_xprt_tcp6:
|
|
protofamily = AF_INET6;
|
|
case Opt_xprt_tcp:
|
|
mnt->flags |= NFS_MOUNT_TCP;
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
|
|
kfree(string);
|
|
break;
|
|
case Opt_xprt_rdma:
|
|
/* vector side protocols to TCP */
|
|
mnt->flags |= NFS_MOUNT_TCP;
|
|
mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
|
|
xprt_load_transport(string);
|
|
kfree(string);
|
|
break;
|
|
default:
|
|
dfprintk(MOUNT, "NFS: unrecognized "
|
|
"transport protocol\n");
|
|
kfree(string);
|
|
return 0;
|
|
}
|
|
break;
|
|
case Opt_mountproto:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
token = match_token(string,
|
|
nfs_xprt_protocol_tokens, args);
|
|
kfree(string);
|
|
|
|
mountfamily = AF_INET;
|
|
switch (token) {
|
|
case Opt_xprt_udp6:
|
|
mountfamily = AF_INET6;
|
|
case Opt_xprt_udp:
|
|
mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
|
|
break;
|
|
case Opt_xprt_tcp6:
|
|
mountfamily = AF_INET6;
|
|
case Opt_xprt_tcp:
|
|
mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
|
|
break;
|
|
case Opt_xprt_rdma: /* not used for side protocols */
|
|
default:
|
|
dfprintk(MOUNT, "NFS: unrecognized "
|
|
"transport protocol\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case Opt_addr:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
mnt->nfs_server.addrlen =
|
|
rpc_pton(string, strlen(string),
|
|
(struct sockaddr *)
|
|
&mnt->nfs_server.address,
|
|
sizeof(mnt->nfs_server.address));
|
|
kfree(string);
|
|
if (mnt->nfs_server.addrlen == 0)
|
|
goto out_invalid_address;
|
|
break;
|
|
case Opt_clientaddr:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
kfree(mnt->client_address);
|
|
mnt->client_address = string;
|
|
break;
|
|
case Opt_mounthost:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
kfree(mnt->mount_server.hostname);
|
|
mnt->mount_server.hostname = string;
|
|
break;
|
|
case Opt_mountaddr:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
mnt->mount_server.addrlen =
|
|
rpc_pton(string, strlen(string),
|
|
(struct sockaddr *)
|
|
&mnt->mount_server.address,
|
|
sizeof(mnt->mount_server.address));
|
|
kfree(string);
|
|
if (mnt->mount_server.addrlen == 0)
|
|
goto out_invalid_address;
|
|
break;
|
|
case Opt_lookupcache:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
token = match_token(string,
|
|
nfs_lookupcache_tokens, args);
|
|
kfree(string);
|
|
switch (token) {
|
|
case Opt_lookupcache_all:
|
|
mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
|
|
break;
|
|
case Opt_lookupcache_positive:
|
|
mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
|
|
mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
|
|
break;
|
|
case Opt_lookupcache_none:
|
|
mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
|
|
break;
|
|
default:
|
|
dfprintk(MOUNT, "NFS: invalid "
|
|
"lookupcache argument\n");
|
|
return 0;
|
|
};
|
|
break;
|
|
case Opt_fscache_uniq:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
kfree(mnt->fscache_uniq);
|
|
mnt->fscache_uniq = string;
|
|
mnt->options |= NFS_OPTION_FSCACHE;
|
|
break;
|
|
|
|
/*
|
|
* Special options
|
|
*/
|
|
case Opt_sloppy:
|
|
sloppy = 1;
|
|
dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
|
|
break;
|
|
case Opt_userspace:
|
|
case Opt_deprecated:
|
|
dfprintk(MOUNT, "NFS: ignoring mount option "
|
|
"'%s'\n", p);
|
|
break;
|
|
|
|
default:
|
|
invalid_option = 1;
|
|
dfprintk(MOUNT, "NFS: unrecognized mount option "
|
|
"'%s'\n", p);
|
|
}
|
|
}
|
|
|
|
if (!sloppy && invalid_option)
|
|
return 0;
|
|
|
|
/*
|
|
* verify that any proto=/mountproto= options match the address
|
|
* familiies in the addr=/mountaddr= options.
|
|
*/
|
|
if (protofamily != AF_UNSPEC &&
|
|
protofamily != mnt->nfs_server.address.ss_family)
|
|
goto out_proto_mismatch;
|
|
|
|
if (mountfamily != AF_UNSPEC) {
|
|
if (mnt->mount_server.addrlen) {
|
|
if (mountfamily != mnt->mount_server.address.ss_family)
|
|
goto out_mountproto_mismatch;
|
|
} else {
|
|
if (mountfamily != mnt->nfs_server.address.ss_family)
|
|
goto out_mountproto_mismatch;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
|
|
out_mountproto_mismatch:
|
|
printk(KERN_INFO "NFS: mount server address does not match mountproto= "
|
|
"option\n");
|
|
return 0;
|
|
out_proto_mismatch:
|
|
printk(KERN_INFO "NFS: server address does not match proto= option\n");
|
|
return 0;
|
|
out_invalid_address:
|
|
printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
|
|
return 0;
|
|
out_invalid_value:
|
|
printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
|
|
return 0;
|
|
out_nomem:
|
|
printk(KERN_INFO "NFS: not enough memory to parse option\n");
|
|
return 0;
|
|
out_security_failure:
|
|
free_secdata(secdata);
|
|
printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Match the requested auth flavors with the list returned by
|
|
* the server. Returns zero and sets the mount's authentication
|
|
* flavor on success; returns -EACCES if server does not support
|
|
* the requested flavor.
|
|
*/
|
|
static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
|
|
struct nfs_mount_request *request)
|
|
{
|
|
unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
|
|
|
|
/*
|
|
* Certain releases of Linux's mountd return an empty
|
|
* flavor list. To prevent behavioral regression with
|
|
* these servers (ie. rejecting mounts that used to
|
|
* succeed), revert to pre-2.6.32 behavior (no checking)
|
|
* if the returned flavor list is empty.
|
|
*/
|
|
if (server_authlist_len == 0)
|
|
return 0;
|
|
|
|
/*
|
|
* We avoid sophisticated negotiating here, as there are
|
|
* plenty of cases where we can get it wrong, providing
|
|
* either too little or too much security.
|
|
*
|
|
* RFC 2623, section 2.7 suggests we SHOULD prefer the
|
|
* flavor listed first. However, some servers list
|
|
* AUTH_NULL first. Our caller plants AUTH_SYS, the
|
|
* preferred default, in args->auth_flavors[0] if user
|
|
* didn't specify sec= mount option.
|
|
*/
|
|
for (i = 0; i < args->auth_flavor_len; i++)
|
|
for (j = 0; j < server_authlist_len; j++)
|
|
if (args->auth_flavors[i] == request->auth_flavs[j]) {
|
|
dfprintk(MOUNT, "NFS: using auth flavor %d\n",
|
|
request->auth_flavs[j]);
|
|
args->auth_flavors[0] = request->auth_flavs[j];
|
|
return 0;
|
|
}
|
|
|
|
dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
|
|
nfs_umount(request);
|
|
return -EACCES;
|
|
}
|
|
|
|
/*
|
|
* Use the remote server's MOUNT service to request the NFS file handle
|
|
* corresponding to the provided path.
|
|
*/
|
|
static int nfs_try_mount(struct nfs_parsed_mount_data *args,
|
|
struct nfs_fh *root_fh)
|
|
{
|
|
rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
|
|
unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
|
|
struct nfs_mount_request request = {
|
|
.sap = (struct sockaddr *)
|
|
&args->mount_server.address,
|
|
.dirpath = args->nfs_server.export_path,
|
|
.protocol = args->mount_server.protocol,
|
|
.fh = root_fh,
|
|
.noresvport = args->flags & NFS_MOUNT_NORESVPORT,
|
|
.auth_flav_len = &server_authlist_len,
|
|
.auth_flavs = server_authlist,
|
|
};
|
|
int status;
|
|
|
|
if (args->mount_server.version == 0) {
|
|
switch (args->version) {
|
|
default:
|
|
args->mount_server.version = NFS_MNT3_VERSION;
|
|
break;
|
|
case 2:
|
|
args->mount_server.version = NFS_MNT_VERSION;
|
|
}
|
|
}
|
|
request.version = args->mount_server.version;
|
|
|
|
if (args->mount_server.hostname)
|
|
request.hostname = args->mount_server.hostname;
|
|
else
|
|
request.hostname = args->nfs_server.hostname;
|
|
|
|
/*
|
|
* Construct the mount server's address.
|
|
*/
|
|
if (args->mount_server.address.ss_family == AF_UNSPEC) {
|
|
memcpy(request.sap, &args->nfs_server.address,
|
|
args->nfs_server.addrlen);
|
|
args->mount_server.addrlen = args->nfs_server.addrlen;
|
|
}
|
|
request.salen = args->mount_server.addrlen;
|
|
nfs_set_port(request.sap, &args->mount_server.port, 0);
|
|
|
|
/*
|
|
* Now ask the mount server to map our export path
|
|
* to a file handle.
|
|
*/
|
|
status = nfs_mount(&request);
|
|
if (status != 0) {
|
|
dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
|
|
request.hostname, status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* MNTv1 (NFSv2) does not support auth flavor negotiation.
|
|
*/
|
|
if (args->mount_server.version != NFS_MNT3_VERSION)
|
|
return 0;
|
|
return nfs_walk_authlist(args, &request);
|
|
}
|
|
|
|
static int nfs_parse_simple_hostname(const char *dev_name,
|
|
char **hostname, size_t maxnamlen,
|
|
char **export_path, size_t maxpathlen)
|
|
{
|
|
size_t len;
|
|
char *colon, *comma;
|
|
|
|
colon = strchr(dev_name, ':');
|
|
if (colon == NULL)
|
|
goto out_bad_devname;
|
|
|
|
len = colon - dev_name;
|
|
if (len > maxnamlen)
|
|
goto out_hostname;
|
|
|
|
/* N.B. caller will free nfs_server.hostname in all cases */
|
|
*hostname = kstrndup(dev_name, len, GFP_KERNEL);
|
|
if (!*hostname)
|
|
goto out_nomem;
|
|
|
|
/* kill possible hostname list: not supported */
|
|
comma = strchr(*hostname, ',');
|
|
if (comma != NULL) {
|
|
if (comma == *hostname)
|
|
goto out_bad_devname;
|
|
*comma = '\0';
|
|
}
|
|
|
|
colon++;
|
|
len = strlen(colon);
|
|
if (len > maxpathlen)
|
|
goto out_path;
|
|
*export_path = kstrndup(colon, len, GFP_KERNEL);
|
|
if (!*export_path)
|
|
goto out_nomem;
|
|
|
|
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
|
|
return 0;
|
|
|
|
out_bad_devname:
|
|
dfprintk(MOUNT, "NFS: device name not in host:path format\n");
|
|
return -EINVAL;
|
|
|
|
out_nomem:
|
|
dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
|
|
return -ENOMEM;
|
|
|
|
out_hostname:
|
|
dfprintk(MOUNT, "NFS: server hostname too long\n");
|
|
return -ENAMETOOLONG;
|
|
|
|
out_path:
|
|
dfprintk(MOUNT, "NFS: export pathname too long\n");
|
|
return -ENAMETOOLONG;
|
|
}
|
|
|
|
/*
|
|
* Hostname has square brackets around it because it contains one or
|
|
* more colons. We look for the first closing square bracket, and a
|
|
* colon must follow it.
|
|
*/
|
|
static int nfs_parse_protected_hostname(const char *dev_name,
|
|
char **hostname, size_t maxnamlen,
|
|
char **export_path, size_t maxpathlen)
|
|
{
|
|
size_t len;
|
|
char *start, *end;
|
|
|
|
start = (char *)(dev_name + 1);
|
|
|
|
end = strchr(start, ']');
|
|
if (end == NULL)
|
|
goto out_bad_devname;
|
|
if (*(end + 1) != ':')
|
|
goto out_bad_devname;
|
|
|
|
len = end - start;
|
|
if (len > maxnamlen)
|
|
goto out_hostname;
|
|
|
|
/* N.B. caller will free nfs_server.hostname in all cases */
|
|
*hostname = kstrndup(start, len, GFP_KERNEL);
|
|
if (*hostname == NULL)
|
|
goto out_nomem;
|
|
|
|
end += 2;
|
|
len = strlen(end);
|
|
if (len > maxpathlen)
|
|
goto out_path;
|
|
*export_path = kstrndup(end, len, GFP_KERNEL);
|
|
if (!*export_path)
|
|
goto out_nomem;
|
|
|
|
return 0;
|
|
|
|
out_bad_devname:
|
|
dfprintk(MOUNT, "NFS: device name not in host:path format\n");
|
|
return -EINVAL;
|
|
|
|
out_nomem:
|
|
dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
|
|
return -ENOMEM;
|
|
|
|
out_hostname:
|
|
dfprintk(MOUNT, "NFS: server hostname too long\n");
|
|
return -ENAMETOOLONG;
|
|
|
|
out_path:
|
|
dfprintk(MOUNT, "NFS: export pathname too long\n");
|
|
return -ENAMETOOLONG;
|
|
}
|
|
|
|
/*
|
|
* Split "dev_name" into "hostname:export_path".
|
|
*
|
|
* The leftmost colon demarks the split between the server's hostname
|
|
* and the export path. If the hostname starts with a left square
|
|
* bracket, then it may contain colons.
|
|
*
|
|
* Note: caller frees hostname and export path, even on error.
|
|
*/
|
|
static int nfs_parse_devname(const char *dev_name,
|
|
char **hostname, size_t maxnamlen,
|
|
char **export_path, size_t maxpathlen)
|
|
{
|
|
if (*dev_name == '[')
|
|
return nfs_parse_protected_hostname(dev_name,
|
|
hostname, maxnamlen,
|
|
export_path, maxpathlen);
|
|
|
|
return nfs_parse_simple_hostname(dev_name,
|
|
hostname, maxnamlen,
|
|
export_path, maxpathlen);
|
|
}
|
|
|
|
/*
|
|
* Validate the NFS2/NFS3 mount data
|
|
* - fills in the mount root filehandle
|
|
*
|
|
* For option strings, user space handles the following behaviors:
|
|
*
|
|
* + DNS: mapping server host name to IP address ("addr=" option)
|
|
*
|
|
* + failure mode: how to behave if a mount request can't be handled
|
|
* immediately ("fg/bg" option)
|
|
*
|
|
* + retry: how often to retry a mount request ("retry=" option)
|
|
*
|
|
* + breaking back: trying proto=udp after proto=tcp, v2 after v3,
|
|
* mountproto=tcp after mountproto=udp, and so on
|
|
*/
|
|
static int nfs_validate_mount_data(void *options,
|
|
struct nfs_parsed_mount_data *args,
|
|
struct nfs_fh *mntfh,
|
|
const char *dev_name)
|
|
{
|
|
struct nfs_mount_data *data = (struct nfs_mount_data *)options;
|
|
struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
|
|
|
|
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) {
|
|
if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
|
|
goto out_invalid_fh;
|
|
mntfh->size = data->root.size;
|
|
args->version = 3;
|
|
} else {
|
|
mntfh->size = NFS2_FHSIZE;
|
|
args->version = 2;
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
/*
|
|
* Translate to nfs_parsed_mount_data, which nfs_fill_super
|
|
* can deal with.
|
|
*/
|
|
args->flags = data->flags & NFS_MOUNT_FLAGMASK;
|
|
args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
|
|
args->rsize = data->rsize;
|
|
args->wsize = data->wsize;
|
|
args->timeo = data->timeo;
|
|
args->retrans = data->retrans;
|
|
args->acregmin = data->acregmin;
|
|
args->acregmax = data->acregmax;
|
|
args->acdirmin = data->acdirmin;
|
|
args->acdirmax = data->acdirmax;
|
|
|
|
memcpy(sap, &data->addr, sizeof(data->addr));
|
|
args->nfs_server.addrlen = sizeof(data->addr);
|
|
if (!nfs_verify_server_address(sap))
|
|
goto out_no_address;
|
|
|
|
if (!(data->flags & NFS_MOUNT_TCP))
|
|
args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
|
|
/* N.B. caller will free nfs_server.hostname in all cases */
|
|
args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
|
|
args->namlen = data->namlen;
|
|
args->bsize = data->bsize;
|
|
|
|
if (data->flags & NFS_MOUNT_SECFLAVOUR)
|
|
args->auth_flavors[0] = data->pseudoflavor;
|
|
if (!args->nfs_server.hostname)
|
|
goto out_nomem;
|
|
|
|
/*
|
|
* The legacy version 6 binary mount data from userspace has a
|
|
* field used only to transport selinux information into the
|
|
* the kernel. To continue to support that functionality we
|
|
* have a touch of selinux knowledge here in the NFS code. The
|
|
* userspace code converted context=blah to just blah so we are
|
|
* converting back to the full string selinux understands.
|
|
*/
|
|
if (data->context[0]){
|
|
#ifdef CONFIG_SECURITY_SELINUX
|
|
int rc;
|
|
char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
|
|
if (!opts_str)
|
|
return -ENOMEM;
|
|
strcpy(opts_str, "context=");
|
|
data->context[NFS_MAX_CONTEXT_LEN] = '\0';
|
|
strcat(opts_str, &data->context[0]);
|
|
rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
|
|
kfree(opts_str);
|
|
if (rc)
|
|
return rc;
|
|
#else
|
|
return -EINVAL;
|
|
#endif
|
|
}
|
|
|
|
break;
|
|
default: {
|
|
int status;
|
|
|
|
if (nfs_parse_mount_options((char *)options, args) == 0)
|
|
return -EINVAL;
|
|
|
|
if (!nfs_verify_server_address(sap))
|
|
goto out_no_address;
|
|
|
|
if (args->version == 4)
|
|
#ifdef CONFIG_NFS_V4
|
|
return nfs4_validate_text_mount_data(options,
|
|
args, dev_name);
|
|
#else
|
|
goto out_v4_not_compiled;
|
|
#endif
|
|
|
|
nfs_set_port(sap, &args->nfs_server.port, 0);
|
|
|
|
nfs_set_mount_transport_protocol(args);
|
|
|
|
status = nfs_parse_devname(dev_name,
|
|
&args->nfs_server.hostname,
|
|
PAGE_SIZE,
|
|
&args->nfs_server.export_path,
|
|
NFS_MAXPATHLEN);
|
|
if (!status)
|
|
status = nfs_try_mount(args, mntfh);
|
|
|
|
kfree(args->nfs_server.export_path);
|
|
args->nfs_server.export_path = NULL;
|
|
|
|
if (status)
|
|
return status;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_NFS_V3
|
|
if (args->version == 3)
|
|
goto out_v3_not_compiled;
|
|
#endif /* !CONFIG_NFS_V3 */
|
|
|
|
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;
|
|
|
|
#ifndef CONFIG_NFS_V3
|
|
out_v3_not_compiled:
|
|
dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
|
|
return -EPROTONOSUPPORT;
|
|
#endif /* !CONFIG_NFS_V3 */
|
|
|
|
#ifndef CONFIG_NFS_V4
|
|
out_v4_not_compiled:
|
|
dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
|
|
return -EPROTONOSUPPORT;
|
|
#endif /* !CONFIG_NFS_V4 */
|
|
|
|
out_nomem:
|
|
dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
|
|
return -ENOMEM;
|
|
|
|
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;
|
|
}
|
|
|
|
static int
|
|
nfs_compare_remount_data(struct nfs_server *nfss,
|
|
struct nfs_parsed_mount_data *data)
|
|
{
|
|
if (data->flags != nfss->flags ||
|
|
data->rsize != nfss->rsize ||
|
|
data->wsize != nfss->wsize ||
|
|
data->retrans != nfss->client->cl_timeout->to_retries ||
|
|
data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
|
|
data->acregmin != nfss->acregmin / HZ ||
|
|
data->acregmax != nfss->acregmax / HZ ||
|
|
data->acdirmin != nfss->acdirmin / HZ ||
|
|
data->acdirmax != nfss->acdirmax / HZ ||
|
|
data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
|
|
data->nfs_server.port != nfss->port ||
|
|
data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
|
|
!rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
|
|
(struct sockaddr *)&nfss->nfs_client->cl_addr))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
nfs_remount(struct super_block *sb, int *flags, char *raw_data)
|
|
{
|
|
int error;
|
|
struct nfs_server *nfss = sb->s_fs_info;
|
|
struct nfs_parsed_mount_data *data;
|
|
struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
|
|
struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
|
|
u32 nfsvers = nfss->nfs_client->rpc_ops->version;
|
|
|
|
/*
|
|
* Userspace mount programs that send binary options generally send
|
|
* them populated with default values. We have no way to know which
|
|
* ones were explicitly specified. Fall back to legacy behavior and
|
|
* just return success.
|
|
*/
|
|
if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
|
|
(nfsvers <= 3 && (!options || (options->version >= 1 &&
|
|
options->version <= 6))))
|
|
return 0;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* fill out struct with values from existing mount */
|
|
data->flags = nfss->flags;
|
|
data->rsize = nfss->rsize;
|
|
data->wsize = nfss->wsize;
|
|
data->retrans = nfss->client->cl_timeout->to_retries;
|
|
data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
|
|
data->acregmin = nfss->acregmin / HZ;
|
|
data->acregmax = nfss->acregmax / HZ;
|
|
data->acdirmin = nfss->acdirmin / HZ;
|
|
data->acdirmax = nfss->acdirmax / HZ;
|
|
data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
|
|
data->nfs_server.port = nfss->port;
|
|
data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
|
|
memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
|
|
data->nfs_server.addrlen);
|
|
|
|
/* overwrite those values with any that were specified */
|
|
error = nfs_parse_mount_options((char *)options, data);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
/* compare new mount options with old ones */
|
|
error = nfs_compare_remount_data(nfss, data);
|
|
out:
|
|
kfree(data);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
sb->s_bdi = &server->backing_dev_info;
|
|
|
|
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_parsed_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->nfs_client->rpc_ops->version == 3) {
|
|
/* 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->nfs_client->rpc_ops->version == 3) {
|
|
/* 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_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
|
|
{
|
|
const struct nfs_server *a = s->s_fs_info;
|
|
const struct rpc_clnt *clnt_a = a->client;
|
|
const struct rpc_clnt *clnt_b = b->client;
|
|
|
|
if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
|
|
goto Ebusy;
|
|
if (a->nfs_client != b->nfs_client)
|
|
goto Ebusy;
|
|
if (a->flags != b->flags)
|
|
goto Ebusy;
|
|
if (a->wsize != b->wsize)
|
|
goto Ebusy;
|
|
if (a->rsize != b->rsize)
|
|
goto Ebusy;
|
|
if (a->acregmin != b->acregmin)
|
|
goto Ebusy;
|
|
if (a->acregmax != b->acregmax)
|
|
goto Ebusy;
|
|
if (a->acdirmin != b->acdirmin)
|
|
goto Ebusy;
|
|
if (a->acdirmax != b->acdirmax)
|
|
goto Ebusy;
|
|
if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
|
|
goto Ebusy;
|
|
return 1;
|
|
Ebusy:
|
|
return 0;
|
|
}
|
|
|
|
struct nfs_sb_mountdata {
|
|
struct nfs_server *server;
|
|
int mntflags;
|
|
};
|
|
|
|
static int nfs_set_super(struct super_block *s, void *data)
|
|
{
|
|
struct nfs_sb_mountdata *sb_mntdata = data;
|
|
struct nfs_server *server = sb_mntdata->server;
|
|
int ret;
|
|
|
|
s->s_flags = sb_mntdata->mntflags;
|
|
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_address(struct nfs_server *server1,
|
|
struct nfs_server *server2)
|
|
{
|
|
struct sockaddr *sap1, *sap2;
|
|
|
|
sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
|
|
sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
|
|
|
|
if (sap1->sa_family != sap2->sa_family)
|
|
return 0;
|
|
|
|
switch (sap1->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
|
|
struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
|
|
if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
|
|
return 0;
|
|
if (sin1->sin_port != sin2->sin_port)
|
|
return 0;
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
|
|
struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
|
|
if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
|
|
return 0;
|
|
if (sin1->sin6_port != sin2->sin6_port)
|
|
return 0;
|
|
break;
|
|
}
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int nfs_compare_super(struct super_block *sb, void *data)
|
|
{
|
|
struct nfs_sb_mountdata *sb_mntdata = data;
|
|
struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
|
|
int mntflags = sb_mntdata->mntflags;
|
|
|
|
if (!nfs_compare_super_address(old, server))
|
|
return 0;
|
|
/* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
|
|
if (old->flags & NFS_MOUNT_UNSHARED)
|
|
return 0;
|
|
if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
|
|
return 0;
|
|
return nfs_compare_mount_options(sb, server, mntflags);
|
|
}
|
|
|
|
static int nfs_bdi_register(struct nfs_server *server)
|
|
{
|
|
return bdi_register_dev(&server->backing_dev_info, server->s_dev);
|
|
}
|
|
|
|
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_parsed_mount_data *data;
|
|
struct nfs_fh *mntfh;
|
|
struct dentry *mntroot;
|
|
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
|
|
struct nfs_sb_mountdata sb_mntdata = {
|
|
.mntflags = flags,
|
|
};
|
|
int error = -ENOMEM;
|
|
|
|
data = nfs_alloc_parsed_mount_data(3);
|
|
mntfh = nfs_alloc_fhandle();
|
|
if (data == NULL || mntfh == NULL)
|
|
goto out_free_fh;
|
|
|
|
security_init_mnt_opts(&data->lsm_opts);
|
|
|
|
/* Validate the mount data */
|
|
error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
#ifdef CONFIG_NFS_V4
|
|
if (data->version == 4) {
|
|
error = nfs4_try_mount(flags, dev_name, data, mnt);
|
|
kfree(data->client_address);
|
|
kfree(data->nfs_server.export_path);
|
|
goto out;
|
|
}
|
|
#endif /* CONFIG_NFS_V4 */
|
|
|
|
/* Get a volume representation */
|
|
server = nfs_create_server(data, mntfh);
|
|
if (IS_ERR(server)) {
|
|
error = PTR_ERR(server);
|
|
goto out;
|
|
}
|
|
sb_mntdata.server = server;
|
|
|
|
if (server->flags & NFS_MOUNT_UNSHARED)
|
|
compare_super = NULL;
|
|
|
|
/* Get a superblock - note that we may end up sharing one that already exists */
|
|
s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
|
|
if (IS_ERR(s)) {
|
|
error = PTR_ERR(s);
|
|
goto out_err_nosb;
|
|
}
|
|
|
|
if (s->s_fs_info != server) {
|
|
nfs_free_server(server);
|
|
server = NULL;
|
|
} else {
|
|
error = nfs_bdi_register(server);
|
|
if (error)
|
|
goto error_splat_bdi;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
/* initial superblock/root creation */
|
|
nfs_fill_super(s, data);
|
|
nfs_fscache_get_super_cookie(
|
|
s, data ? data->fscache_uniq : NULL, NULL);
|
|
}
|
|
|
|
mntroot = nfs_get_root(s, mntfh);
|
|
if (IS_ERR(mntroot)) {
|
|
error = PTR_ERR(mntroot);
|
|
goto error_splat_super;
|
|
}
|
|
|
|
error = security_sb_set_mnt_opts(s, &data->lsm_opts);
|
|
if (error)
|
|
goto error_splat_root;
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
mnt->mnt_sb = s;
|
|
mnt->mnt_root = mntroot;
|
|
error = 0;
|
|
|
|
out:
|
|
kfree(data->nfs_server.hostname);
|
|
kfree(data->mount_server.hostname);
|
|
kfree(data->fscache_uniq);
|
|
security_free_mnt_opts(&data->lsm_opts);
|
|
out_free_fh:
|
|
nfs_free_fhandle(mntfh);
|
|
kfree(data);
|
|
return error;
|
|
|
|
out_err_nosb:
|
|
nfs_free_server(server);
|
|
goto out;
|
|
|
|
error_splat_root:
|
|
dput(mntroot);
|
|
error_splat_super:
|
|
if (server && !s->s_root)
|
|
bdi_unregister(&server->backing_dev_info);
|
|
error_splat_bdi:
|
|
deactivate_locked_super(s);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Ensure that we unregister the bdi before kill_anon_super
|
|
* releases the device name
|
|
*/
|
|
static void nfs_put_super(struct super_block *s)
|
|
{
|
|
struct nfs_server *server = NFS_SB(s);
|
|
|
|
bdi_unregister(&server->backing_dev_info);
|
|
}
|
|
|
|
/*
|
|
* 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_fscache_release_super_cookie(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 (*compare_super)(struct super_block *, void *) = nfs_compare_super;
|
|
struct nfs_sb_mountdata sb_mntdata = {
|
|
.mntflags = flags,
|
|
};
|
|
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;
|
|
}
|
|
sb_mntdata.server = server;
|
|
|
|
if (server->flags & NFS_MOUNT_UNSHARED)
|
|
compare_super = NULL;
|
|
|
|
/* Get a superblock - note that we may end up sharing one that already exists */
|
|
s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
|
|
if (IS_ERR(s)) {
|
|
error = PTR_ERR(s);
|
|
goto out_err_nosb;
|
|
}
|
|
|
|
if (s->s_fs_info != server) {
|
|
nfs_free_server(server);
|
|
server = NULL;
|
|
} else {
|
|
error = nfs_bdi_register(server);
|
|
if (error)
|
|
goto error_splat_bdi;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
/* initial superblock/root creation */
|
|
nfs_clone_super(s, data->sb);
|
|
nfs_fscache_get_super_cookie(s, NULL, data);
|
|
}
|
|
|
|
mntroot = nfs_get_root(s, data->fh);
|
|
if (IS_ERR(mntroot)) {
|
|
error = PTR_ERR(mntroot);
|
|
goto error_splat_super;
|
|
}
|
|
if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
|
|
dput(mntroot);
|
|
error = -ESTALE;
|
|
goto error_splat_super;
|
|
}
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
mnt->mnt_sb = s;
|
|
mnt->mnt_root = mntroot;
|
|
|
|
/* clone any lsm security options from the parent to the new sb */
|
|
security_sb_clone_mnt_opts(data->sb, s);
|
|
|
|
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:
|
|
if (server && !s->s_root)
|
|
bdi_unregister(&server->backing_dev_info);
|
|
error_splat_bdi:
|
|
deactivate_locked_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);
|
|
}
|
|
|
|
static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
|
|
{
|
|
args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
|
|
}
|
|
|
|
static int nfs4_validate_text_mount_data(void *options,
|
|
struct nfs_parsed_mount_data *args,
|
|
const char *dev_name)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
|
|
|
|
nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
|
|
|
|
nfs_validate_transport_protocol(args);
|
|
|
|
nfs4_validate_mount_flags(args);
|
|
|
|
if (args->version != 4) {
|
|
dfprintk(MOUNT,
|
|
"NFS4: Illegal mount version\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (args->auth_flavor_len > 1) {
|
|
dfprintk(MOUNT,
|
|
"NFS4: Too many RPC auth flavours specified\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (args->client_address == NULL) {
|
|
dfprintk(MOUNT,
|
|
"NFS4: mount program didn't pass callback address\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return nfs_parse_devname(dev_name,
|
|
&args->nfs_server.hostname,
|
|
NFS4_MAXNAMLEN,
|
|
&args->nfs_server.export_path,
|
|
NFS4_MAXPATHLEN);
|
|
}
|
|
|
|
/*
|
|
* Validate NFSv4 mount options
|
|
*/
|
|
static int nfs4_validate_mount_data(void *options,
|
|
struct nfs_parsed_mount_data *args,
|
|
const char *dev_name)
|
|
{
|
|
struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
|
|
struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
|
|
char *c;
|
|
|
|
if (data == NULL)
|
|
goto out_no_data;
|
|
|
|
switch (data->version) {
|
|
case 1:
|
|
if (data->host_addrlen > sizeof(args->nfs_server.address))
|
|
goto out_no_address;
|
|
if (data->host_addrlen == 0)
|
|
goto out_no_address;
|
|
args->nfs_server.addrlen = data->host_addrlen;
|
|
if (copy_from_user(sap, data->host_addr, data->host_addrlen))
|
|
return -EFAULT;
|
|
if (!nfs_verify_server_address(sap))
|
|
goto out_no_address;
|
|
|
|
if (data->auth_flavourlen) {
|
|
if (data->auth_flavourlen > 1)
|
|
goto out_inval_auth;
|
|
if (copy_from_user(&args->auth_flavors[0],
|
|
data->auth_flavours,
|
|
sizeof(args->auth_flavors[0])))
|
|
return -EFAULT;
|
|
}
|
|
|
|
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
|
|
if (IS_ERR(c))
|
|
return PTR_ERR(c);
|
|
args->nfs_server.hostname = c;
|
|
|
|
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
|
|
if (IS_ERR(c))
|
|
return PTR_ERR(c);
|
|
args->nfs_server.export_path = c;
|
|
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
|
|
|
|
c = strndup_user(data->client_addr.data, 16);
|
|
if (IS_ERR(c))
|
|
return PTR_ERR(c);
|
|
args->client_address = c;
|
|
|
|
/*
|
|
* Translate to nfs_parsed_mount_data, which nfs4_fill_super
|
|
* can deal with.
|
|
*/
|
|
|
|
args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
|
|
args->rsize = data->rsize;
|
|
args->wsize = data->wsize;
|
|
args->timeo = data->timeo;
|
|
args->retrans = data->retrans;
|
|
args->acregmin = data->acregmin;
|
|
args->acregmax = data->acregmax;
|
|
args->acdirmin = data->acdirmin;
|
|
args->acdirmax = data->acdirmax;
|
|
args->nfs_server.protocol = data->proto;
|
|
nfs_validate_transport_protocol(args);
|
|
|
|
break;
|
|
default:
|
|
if (nfs_parse_mount_options((char *)options, args) == 0)
|
|
return -EINVAL;
|
|
|
|
if (!nfs_verify_server_address(sap))
|
|
return -EINVAL;
|
|
|
|
return nfs4_validate_text_mount_data(options, args, dev_name);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Get the superblock for the NFS4 root partition
|
|
*/
|
|
static int nfs4_remote_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
|
|
{
|
|
struct nfs_parsed_mount_data *data = raw_data;
|
|
struct super_block *s;
|
|
struct nfs_server *server;
|
|
struct nfs_fh *mntfh;
|
|
struct dentry *mntroot;
|
|
int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
|
|
struct nfs_sb_mountdata sb_mntdata = {
|
|
.mntflags = flags,
|
|
};
|
|
int error = -ENOMEM;
|
|
|
|
mntfh = nfs_alloc_fhandle();
|
|
if (data == NULL || mntfh == NULL)
|
|
goto out_free_fh;
|
|
|
|
security_init_mnt_opts(&data->lsm_opts);
|
|
|
|
/* Get a volume representation */
|
|
server = nfs4_create_server(data, mntfh);
|
|
if (IS_ERR(server)) {
|
|
error = PTR_ERR(server);
|
|
goto out;
|
|
}
|
|
sb_mntdata.server = server;
|
|
|
|
if (server->flags & NFS4_MOUNT_UNSHARED)
|
|
compare_super = NULL;
|
|
|
|
/* Get a superblock - note that we may end up sharing one that already exists */
|
|
s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
|
|
if (IS_ERR(s)) {
|
|
error = PTR_ERR(s);
|
|
goto out_free;
|
|
}
|
|
|
|
if (s->s_fs_info != server) {
|
|
nfs_free_server(server);
|
|
server = NULL;
|
|
} else {
|
|
error = nfs_bdi_register(server);
|
|
if (error)
|
|
goto error_splat_bdi;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
/* initial superblock/root creation */
|
|
nfs4_fill_super(s);
|
|
nfs_fscache_get_super_cookie(
|
|
s, data ? data->fscache_uniq : NULL, NULL);
|
|
}
|
|
|
|
mntroot = nfs4_get_root(s, mntfh);
|
|
if (IS_ERR(mntroot)) {
|
|
error = PTR_ERR(mntroot);
|
|
goto error_splat_super;
|
|
}
|
|
|
|
error = security_sb_set_mnt_opts(s, &data->lsm_opts);
|
|
if (error)
|
|
goto error_splat_root;
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
mnt->mnt_sb = s;
|
|
mnt->mnt_root = mntroot;
|
|
error = 0;
|
|
|
|
out:
|
|
security_free_mnt_opts(&data->lsm_opts);
|
|
out_free_fh:
|
|
nfs_free_fhandle(mntfh);
|
|
return error;
|
|
|
|
out_free:
|
|
nfs_free_server(server);
|
|
goto out;
|
|
|
|
error_splat_root:
|
|
dput(mntroot);
|
|
error_splat_super:
|
|
if (server && !s->s_root)
|
|
bdi_unregister(&server->backing_dev_info);
|
|
error_splat_bdi:
|
|
deactivate_locked_super(s);
|
|
goto out;
|
|
}
|
|
|
|
static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
|
|
int flags, void *data, const char *hostname)
|
|
{
|
|
struct vfsmount *root_mnt;
|
|
char *root_devname;
|
|
size_t len;
|
|
|
|
len = strlen(hostname) + 3;
|
|
root_devname = kmalloc(len, GFP_KERNEL);
|
|
if (root_devname == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
snprintf(root_devname, len, "%s:/", hostname);
|
|
root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
|
|
kfree(root_devname);
|
|
return root_mnt;
|
|
}
|
|
|
|
static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
|
|
{
|
|
char *page = (char *) __get_free_page(GFP_KERNEL);
|
|
char *devname, *tmp;
|
|
|
|
if (page == NULL)
|
|
return;
|
|
devname = nfs_path(path->mnt->mnt_devname,
|
|
path->mnt->mnt_root, path->dentry,
|
|
page, PAGE_SIZE);
|
|
if (IS_ERR(devname))
|
|
goto out_freepage;
|
|
tmp = kstrdup(devname, GFP_KERNEL);
|
|
if (tmp == NULL)
|
|
goto out_freepage;
|
|
kfree(mnt->mnt_devname);
|
|
mnt->mnt_devname = tmp;
|
|
out_freepage:
|
|
free_page((unsigned long)page);
|
|
}
|
|
|
|
struct nfs_referral_count {
|
|
struct list_head list;
|
|
const struct task_struct *task;
|
|
unsigned int referral_count;
|
|
};
|
|
|
|
static LIST_HEAD(nfs_referral_count_list);
|
|
static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
|
|
|
|
static struct nfs_referral_count *nfs_find_referral_count(void)
|
|
{
|
|
struct nfs_referral_count *p;
|
|
|
|
list_for_each_entry(p, &nfs_referral_count_list, list) {
|
|
if (p->task == current)
|
|
return p;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#define NFS_MAX_NESTED_REFERRALS 2
|
|
|
|
static int nfs_referral_loop_protect(void)
|
|
{
|
|
struct nfs_referral_count *p, *new;
|
|
int ret = -ENOMEM;
|
|
|
|
new = kmalloc(sizeof(*new), GFP_KERNEL);
|
|
if (!new)
|
|
goto out;
|
|
new->task = current;
|
|
new->referral_count = 1;
|
|
|
|
ret = 0;
|
|
spin_lock(&nfs_referral_count_list_lock);
|
|
p = nfs_find_referral_count();
|
|
if (p != NULL) {
|
|
if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
|
|
ret = -ELOOP;
|
|
else
|
|
p->referral_count++;
|
|
} else {
|
|
list_add(&new->list, &nfs_referral_count_list);
|
|
new = NULL;
|
|
}
|
|
spin_unlock(&nfs_referral_count_list_lock);
|
|
kfree(new);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void nfs_referral_loop_unprotect(void)
|
|
{
|
|
struct nfs_referral_count *p;
|
|
|
|
spin_lock(&nfs_referral_count_list_lock);
|
|
p = nfs_find_referral_count();
|
|
p->referral_count--;
|
|
if (p->referral_count == 0)
|
|
list_del(&p->list);
|
|
else
|
|
p = NULL;
|
|
spin_unlock(&nfs_referral_count_list_lock);
|
|
kfree(p);
|
|
}
|
|
|
|
static int nfs_follow_remote_path(struct vfsmount *root_mnt,
|
|
const char *export_path, struct vfsmount *mnt_target)
|
|
{
|
|
struct nameidata *nd = NULL;
|
|
struct mnt_namespace *ns_private;
|
|
struct super_block *s;
|
|
int ret;
|
|
|
|
nd = kmalloc(sizeof(*nd), GFP_KERNEL);
|
|
if (nd == NULL)
|
|
return -ENOMEM;
|
|
|
|
ns_private = create_mnt_ns(root_mnt);
|
|
ret = PTR_ERR(ns_private);
|
|
if (IS_ERR(ns_private))
|
|
goto out_mntput;
|
|
|
|
ret = nfs_referral_loop_protect();
|
|
if (ret != 0)
|
|
goto out_put_mnt_ns;
|
|
|
|
ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
|
|
export_path, LOOKUP_FOLLOW, nd);
|
|
|
|
nfs_referral_loop_unprotect();
|
|
put_mnt_ns(ns_private);
|
|
|
|
if (ret != 0)
|
|
goto out_err;
|
|
|
|
s = nd->path.mnt->mnt_sb;
|
|
atomic_inc(&s->s_active);
|
|
mnt_target->mnt_sb = s;
|
|
mnt_target->mnt_root = dget(nd->path.dentry);
|
|
|
|
/* Correct the device pathname */
|
|
nfs_fix_devname(&nd->path, mnt_target);
|
|
|
|
path_put(&nd->path);
|
|
kfree(nd);
|
|
down_write(&s->s_umount);
|
|
return 0;
|
|
out_put_mnt_ns:
|
|
put_mnt_ns(ns_private);
|
|
out_mntput:
|
|
mntput(root_mnt);
|
|
out_err:
|
|
kfree(nd);
|
|
return ret;
|
|
}
|
|
|
|
static int nfs4_try_mount(int flags, const char *dev_name,
|
|
struct nfs_parsed_mount_data *data,
|
|
struct vfsmount *mnt)
|
|
{
|
|
char *export_path;
|
|
struct vfsmount *root_mnt;
|
|
int error;
|
|
|
|
dfprintk(MOUNT, "--> nfs4_try_mount()\n");
|
|
|
|
export_path = data->nfs_server.export_path;
|
|
data->nfs_server.export_path = "/";
|
|
root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
|
|
data->nfs_server.hostname);
|
|
data->nfs_server.export_path = export_path;
|
|
|
|
error = PTR_ERR(root_mnt);
|
|
if (IS_ERR(root_mnt))
|
|
goto out;
|
|
|
|
error = nfs_follow_remote_path(root_mnt, export_path, mnt);
|
|
|
|
out:
|
|
dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
|
|
error != 0 ? " [error]" : "");
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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 nfs_parsed_mount_data *data;
|
|
int error = -ENOMEM;
|
|
|
|
data = nfs_alloc_parsed_mount_data(4);
|
|
if (data == NULL)
|
|
goto out_free_data;
|
|
|
|
/* Validate the mount data */
|
|
error = nfs4_validate_mount_data(raw_data, data, dev_name);
|
|
if (error < 0)
|
|
goto out;
|
|
|
|
error = nfs4_try_mount(flags, dev_name, data, mnt);
|
|
|
|
out:
|
|
kfree(data->client_address);
|
|
kfree(data->nfs_server.export_path);
|
|
kfree(data->nfs_server.hostname);
|
|
kfree(data->fscache_uniq);
|
|
out_free_data:
|
|
kfree(data);
|
|
dprintk("<-- nfs4_get_sb() = %d%s\n", error,
|
|
error != 0 ? " [error]" : "");
|
|
return error;
|
|
}
|
|
|
|
static void nfs4_kill_super(struct super_block *sb)
|
|
{
|
|
struct nfs_server *server = NFS_SB(sb);
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
nfs_super_return_all_delegations(sb);
|
|
kill_anon_super(sb);
|
|
nfs_fscache_release_super_cookie(sb);
|
|
nfs_free_server(server);
|
|
dprintk("<-- %s\n", __func__);
|
|
}
|
|
|
|
/*
|
|
* 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 (*compare_super)(struct super_block *, void *) = nfs_compare_super;
|
|
struct nfs_sb_mountdata sb_mntdata = {
|
|
.mntflags = flags,
|
|
};
|
|
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;
|
|
}
|
|
sb_mntdata.server = server;
|
|
|
|
if (server->flags & NFS4_MOUNT_UNSHARED)
|
|
compare_super = NULL;
|
|
|
|
/* Get a superblock - note that we may end up sharing one that already exists */
|
|
s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
|
|
if (IS_ERR(s)) {
|
|
error = PTR_ERR(s);
|
|
goto out_err_nosb;
|
|
}
|
|
|
|
if (s->s_fs_info != server) {
|
|
nfs_free_server(server);
|
|
server = NULL;
|
|
} else {
|
|
error = nfs_bdi_register(server);
|
|
if (error)
|
|
goto error_splat_bdi;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
/* initial superblock/root creation */
|
|
nfs4_clone_super(s, data->sb);
|
|
nfs_fscache_get_super_cookie(s, NULL, data);
|
|
}
|
|
|
|
mntroot = nfs4_get_root(s, data->fh);
|
|
if (IS_ERR(mntroot)) {
|
|
error = PTR_ERR(mntroot);
|
|
goto error_splat_super;
|
|
}
|
|
if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
|
|
dput(mntroot);
|
|
error = -ESTALE;
|
|
goto error_splat_super;
|
|
}
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
mnt->mnt_sb = s;
|
|
mnt->mnt_root = mntroot;
|
|
|
|
security_sb_clone_mnt_opts(data->sb, s);
|
|
|
|
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:
|
|
if (server && !s->s_root)
|
|
bdi_unregister(&server->backing_dev_info);
|
|
error_splat_bdi:
|
|
deactivate_locked_super(s);
|
|
dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
|
|
return error;
|
|
}
|
|
|
|
static int nfs4_remote_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 (*compare_super)(struct super_block *, void *) = nfs_compare_super;
|
|
struct nfs_sb_mountdata sb_mntdata = {
|
|
.mntflags = flags,
|
|
};
|
|
int error = -ENOMEM;
|
|
|
|
dprintk("--> nfs4_referral_get_sb()\n");
|
|
|
|
mntfh = nfs_alloc_fhandle();
|
|
if (mntfh == NULL)
|
|
goto out_err_nofh;
|
|
|
|
/* create a new volume representation */
|
|
server = nfs4_create_referral_server(data, mntfh);
|
|
if (IS_ERR(server)) {
|
|
error = PTR_ERR(server);
|
|
goto out_err_noserver;
|
|
}
|
|
sb_mntdata.server = server;
|
|
|
|
if (server->flags & NFS4_MOUNT_UNSHARED)
|
|
compare_super = NULL;
|
|
|
|
/* Get a superblock - note that we may end up sharing one that already exists */
|
|
s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
|
|
if (IS_ERR(s)) {
|
|
error = PTR_ERR(s);
|
|
goto out_err_nosb;
|
|
}
|
|
|
|
if (s->s_fs_info != server) {
|
|
nfs_free_server(server);
|
|
server = NULL;
|
|
} else {
|
|
error = nfs_bdi_register(server);
|
|
if (error)
|
|
goto error_splat_bdi;
|
|
}
|
|
|
|
if (!s->s_root) {
|
|
/* initial superblock/root creation */
|
|
nfs4_fill_super(s);
|
|
nfs_fscache_get_super_cookie(s, NULL, data);
|
|
}
|
|
|
|
mntroot = nfs4_get_root(s, mntfh);
|
|
if (IS_ERR(mntroot)) {
|
|
error = PTR_ERR(mntroot);
|
|
goto error_splat_super;
|
|
}
|
|
if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
|
|
dput(mntroot);
|
|
error = -ESTALE;
|
|
goto error_splat_super;
|
|
}
|
|
|
|
s->s_flags |= MS_ACTIVE;
|
|
mnt->mnt_sb = s;
|
|
mnt->mnt_root = mntroot;
|
|
|
|
security_sb_clone_mnt_opts(data->sb, s);
|
|
|
|
nfs_free_fhandle(mntfh);
|
|
dprintk("<-- nfs4_referral_get_sb() = 0\n");
|
|
return 0;
|
|
|
|
out_err_nosb:
|
|
nfs_free_server(server);
|
|
out_err_noserver:
|
|
nfs_free_fhandle(mntfh);
|
|
out_err_nofh:
|
|
dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
|
|
return error;
|
|
|
|
error_splat_super:
|
|
if (server && !s->s_root)
|
|
bdi_unregister(&server->backing_dev_info);
|
|
error_splat_bdi:
|
|
deactivate_locked_super(s);
|
|
nfs_free_fhandle(mntfh);
|
|
dprintk("<-- nfs4_referral_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;
|
|
char *export_path;
|
|
struct vfsmount *root_mnt;
|
|
int error;
|
|
|
|
dprintk("--> nfs4_referral_get_sb()\n");
|
|
|
|
export_path = data->mnt_path;
|
|
data->mnt_path = "/";
|
|
|
|
root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
|
|
flags, data, data->hostname);
|
|
data->mnt_path = export_path;
|
|
|
|
error = PTR_ERR(root_mnt);
|
|
if (IS_ERR(root_mnt))
|
|
goto out;
|
|
|
|
error = nfs_follow_remote_path(root_mnt, export_path, mnt);
|
|
out:
|
|
dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
|
|
error != 0 ? " [error]" : "");
|
|
return error;
|
|
}
|
|
|
|
#endif /* CONFIG_NFS_V4 */
|