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linux/fs/nfsd/nfsd.h
J. Bruce Fields 681370f4b0 nfsd4: fix nfsdfs reference count loop 
We don't drop the reference on the nfsdfs filesystem with
mntput(nn->nfsd_mnt) until nfsd_exit_net(), but that won't be called
until the nfsd module's unloaded, and we can't unload the module as long
as there's a reference on nfsdfs.  So this prevents module unloading.

Fixes: 2c830dd720 ("nfsd: persist nfsd filesystem across mounts")
Reported-and-Tested-by:  Luo Xiaogang <lxgrxd@163.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-06-29 14:48:02 -04:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Hodge-podge collection of knfsd-related stuff.
* I will sort this out later.
*
* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef LINUX_NFSD_NFSD_H
#define LINUX_NFSD_NFSD_H
#include <linux/types.h>
#include <linux/mount.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svc_xprt.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/addr.h>
#include <uapi/linux/nfsd/debug.h>
#include "netns.h"
#include "stats.h"
#include "export.h"
#undef ifdebug
#ifdef CONFIG_SUNRPC_DEBUG
# define ifdebug(flag) if (nfsd_debug & NFSDDBG_##flag)
#else
# define ifdebug(flag) if (0)
#endif
/*
* nfsd version
*/
#define NFSD_SUPPORTED_MINOR_VERSION 2
/*
* Maximum blocksizes supported by daemon under various circumstances.
*/
#define NFSSVC_MAXBLKSIZE RPCSVC_MAXPAYLOAD
/* NFSv2 is limited by the protocol specification, see RFC 1094 */
#define NFSSVC_MAXBLKSIZE_V2 (8*1024)
/*
* Largest number of bytes we need to allocate for an NFS
* call or reply. Used to control buffer sizes. We use
* the length of v3 WRITE, READDIR and READDIR replies
* which are an RPC header, up to 26 XDR units of reply
* data, and some page data.
*
* Note that accuracy here doesn't matter too much as the
* size is rounded up to a page size when allocating space.
*/
#define NFSD_BUFSIZE ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
struct readdir_cd {
__be32 err; /* 0, nfserr, or nfserr_eof */
};
extern struct svc_program nfsd_program;
extern const struct svc_version nfsd_version2, nfsd_version3,
nfsd_version4;
extern struct mutex nfsd_mutex;
extern spinlock_t nfsd_drc_lock;
extern unsigned long nfsd_drc_max_mem;
extern unsigned long nfsd_drc_mem_used;
extern const struct seq_operations nfs_exports_op;
/*
* Function prototypes.
*/
int nfsd_svc(int nrservs, struct net *net, const struct cred *cred);
int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
int nfsd_nrthreads(struct net *);
int nfsd_nrpools(struct net *);
int nfsd_get_nrthreads(int n, int *, struct net *);
int nfsd_set_nrthreads(int n, int *, struct net *);
int nfsd_pool_stats_open(struct inode *, struct file *);
int nfsd_pool_stats_release(struct inode *, struct file *);
void nfsd_destroy(struct net *net);
bool i_am_nfsd(void);
int get_nfsdfs(struct net *);
struct nfsdfs_client {
struct kref cl_ref;
void (*cl_release)(struct kref *kref);
};
struct nfsdfs_client *get_nfsdfs_client(struct inode *);
struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
struct nfsdfs_client *ncl, u32 id, const struct tree_descr *);
void nfsd_client_rmdir(struct dentry *dentry);
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
#ifdef CONFIG_NFSD_V2_ACL
extern const struct svc_version nfsd_acl_version2;
#else
#define nfsd_acl_version2 NULL
#endif
#ifdef CONFIG_NFSD_V3_ACL
extern const struct svc_version nfsd_acl_version3;
#else
#define nfsd_acl_version3 NULL
#endif
#endif
struct nfsd_net;
enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change);
int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change);
void nfsd_reset_versions(struct nfsd_net *nn);
int nfsd_create_serv(struct net *net);
extern int nfsd_max_blksize;
static inline int nfsd_v4client(struct svc_rqst *rq)
{
return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
}
static inline struct user_namespace *
nfsd_user_namespace(const struct svc_rqst *rqstp)
{
const struct cred *cred = rqstp->rq_xprt->xpt_cred;
return cred ? cred->user_ns : &init_user_ns;
}
/*
* NFSv4 State
*/
#ifdef CONFIG_NFSD_V4
extern unsigned long max_delegations;
int nfsd4_init_slabs(void);
void nfsd4_free_slabs(void);
int nfs4_state_start(void);
int nfs4_state_start_net(struct net *net);
void nfs4_state_shutdown(void);
void nfs4_state_shutdown_net(struct net *net);
int nfs4_reset_recoverydir(char *recdir);
char * nfs4_recoverydir(void);
bool nfsd4_spo_must_allow(struct svc_rqst *rqstp);
#else
static inline int nfsd4_init_slabs(void) { return 0; }
static inline void nfsd4_free_slabs(void) { }
static inline int nfs4_state_start(void) { return 0; }
static inline int nfs4_state_start_net(struct net *net) { return 0; }
static inline void nfs4_state_shutdown(void) { }
static inline void nfs4_state_shutdown_net(struct net *net) { }
static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
static inline char * nfs4_recoverydir(void) {return NULL; }
static inline bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
{
return false;
}
#endif
/*
* lockd binding
*/
void nfsd_lockd_init(void);
void nfsd_lockd_shutdown(void);
/*
* These macros provide pre-xdr'ed values for faster operation.
*/
#define nfs_ok cpu_to_be32(NFS_OK)
#define nfserr_perm cpu_to_be32(NFSERR_PERM)
#define nfserr_noent cpu_to_be32(NFSERR_NOENT)
#define nfserr_io cpu_to_be32(NFSERR_IO)
#define nfserr_nxio cpu_to_be32(NFSERR_NXIO)
#define nfserr_eagain cpu_to_be32(NFSERR_EAGAIN)
#define nfserr_acces cpu_to_be32(NFSERR_ACCES)
#define nfserr_exist cpu_to_be32(NFSERR_EXIST)
#define nfserr_xdev cpu_to_be32(NFSERR_XDEV)
#define nfserr_nodev cpu_to_be32(NFSERR_NODEV)
#define nfserr_notdir cpu_to_be32(NFSERR_NOTDIR)
#define nfserr_isdir cpu_to_be32(NFSERR_ISDIR)
#define nfserr_inval cpu_to_be32(NFSERR_INVAL)
#define nfserr_fbig cpu_to_be32(NFSERR_FBIG)
#define nfserr_nospc cpu_to_be32(NFSERR_NOSPC)
#define nfserr_rofs cpu_to_be32(NFSERR_ROFS)
#define nfserr_mlink cpu_to_be32(NFSERR_MLINK)
#define nfserr_opnotsupp cpu_to_be32(NFSERR_OPNOTSUPP)
#define nfserr_nametoolong cpu_to_be32(NFSERR_NAMETOOLONG)
#define nfserr_notempty cpu_to_be32(NFSERR_NOTEMPTY)
#define nfserr_dquot cpu_to_be32(NFSERR_DQUOT)
#define nfserr_stale cpu_to_be32(NFSERR_STALE)
#define nfserr_remote cpu_to_be32(NFSERR_REMOTE)
#define nfserr_wflush cpu_to_be32(NFSERR_WFLUSH)
#define nfserr_badhandle cpu_to_be32(NFSERR_BADHANDLE)
#define nfserr_notsync cpu_to_be32(NFSERR_NOT_SYNC)
#define nfserr_badcookie cpu_to_be32(NFSERR_BAD_COOKIE)
#define nfserr_notsupp cpu_to_be32(NFSERR_NOTSUPP)
#define nfserr_toosmall cpu_to_be32(NFSERR_TOOSMALL)
#define nfserr_serverfault cpu_to_be32(NFSERR_SERVERFAULT)
#define nfserr_badtype cpu_to_be32(NFSERR_BADTYPE)
#define nfserr_jukebox cpu_to_be32(NFSERR_JUKEBOX)
#define nfserr_denied cpu_to_be32(NFSERR_DENIED)
#define nfserr_deadlock cpu_to_be32(NFSERR_DEADLOCK)
#define nfserr_expired cpu_to_be32(NFSERR_EXPIRED)
#define nfserr_bad_cookie cpu_to_be32(NFSERR_BAD_COOKIE)
#define nfserr_same cpu_to_be32(NFSERR_SAME)
#define nfserr_clid_inuse cpu_to_be32(NFSERR_CLID_INUSE)
#define nfserr_stale_clientid cpu_to_be32(NFSERR_STALE_CLIENTID)
#define nfserr_resource cpu_to_be32(NFSERR_RESOURCE)
#define nfserr_moved cpu_to_be32(NFSERR_MOVED)
#define nfserr_nofilehandle cpu_to_be32(NFSERR_NOFILEHANDLE)
#define nfserr_minor_vers_mismatch cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
#define nfserr_share_denied cpu_to_be32(NFSERR_SHARE_DENIED)
#define nfserr_stale_stateid cpu_to_be32(NFSERR_STALE_STATEID)
#define nfserr_old_stateid cpu_to_be32(NFSERR_OLD_STATEID)
#define nfserr_bad_stateid cpu_to_be32(NFSERR_BAD_STATEID)
#define nfserr_bad_seqid cpu_to_be32(NFSERR_BAD_SEQID)
#define nfserr_symlink cpu_to_be32(NFSERR_SYMLINK)
#define nfserr_not_same cpu_to_be32(NFSERR_NOT_SAME)
#define nfserr_lock_range cpu_to_be32(NFSERR_LOCK_RANGE)
#define nfserr_restorefh cpu_to_be32(NFSERR_RESTOREFH)
#define nfserr_attrnotsupp cpu_to_be32(NFSERR_ATTRNOTSUPP)
#define nfserr_bad_xdr cpu_to_be32(NFSERR_BAD_XDR)
#define nfserr_openmode cpu_to_be32(NFSERR_OPENMODE)
#define nfserr_badowner cpu_to_be32(NFSERR_BADOWNER)
#define nfserr_locks_held cpu_to_be32(NFSERR_LOCKS_HELD)
#define nfserr_op_illegal cpu_to_be32(NFSERR_OP_ILLEGAL)
#define nfserr_grace cpu_to_be32(NFSERR_GRACE)
#define nfserr_no_grace cpu_to_be32(NFSERR_NO_GRACE)
#define nfserr_reclaim_bad cpu_to_be32(NFSERR_RECLAIM_BAD)
#define nfserr_badname cpu_to_be32(NFSERR_BADNAME)
#define nfserr_cb_path_down cpu_to_be32(NFSERR_CB_PATH_DOWN)
#define nfserr_locked cpu_to_be32(NFSERR_LOCKED)
#define nfserr_wrongsec cpu_to_be32(NFSERR_WRONGSEC)
#define nfserr_badiomode cpu_to_be32(NFS4ERR_BADIOMODE)
#define nfserr_badlayout cpu_to_be32(NFS4ERR_BADLAYOUT)
#define nfserr_bad_session_digest cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
#define nfserr_badsession cpu_to_be32(NFS4ERR_BADSESSION)
#define nfserr_badslot cpu_to_be32(NFS4ERR_BADSLOT)
#define nfserr_complete_already cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
#define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
#define nfserr_deleg_already_wanted cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
#define nfserr_back_chan_busy cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
#define nfserr_layouttrylater cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
#define nfserr_layoutunavailable cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
#define nfserr_nomatching_layout cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
#define nfserr_recallconflict cpu_to_be32(NFS4ERR_RECALLCONFLICT)
#define nfserr_unknown_layouttype cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
#define nfserr_seq_misordered cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
#define nfserr_sequence_pos cpu_to_be32(NFS4ERR_SEQUENCE_POS)
#define nfserr_req_too_big cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
#define nfserr_rep_too_big cpu_to_be32(NFS4ERR_REP_TOO_BIG)
#define nfserr_rep_too_big_to_cache cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
#define nfserr_retry_uncached_rep cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
#define nfserr_unsafe_compound cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
#define nfserr_too_many_ops cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
#define nfserr_op_not_in_session cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
#define nfserr_hash_alg_unsupp cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
#define nfserr_clientid_busy cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
#define nfserr_pnfs_io_hole cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
#define nfserr_seq_false_retry cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
#define nfserr_bad_high_slot cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
#define nfserr_deadsession cpu_to_be32(NFS4ERR_DEADSESSION)
#define nfserr_encr_alg_unsupp cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
#define nfserr_pnfs_no_layout cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
#define nfserr_not_only_op cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
#define nfserr_wrong_cred cpu_to_be32(NFS4ERR_WRONG_CRED)
#define nfserr_wrong_type cpu_to_be32(NFS4ERR_WRONG_TYPE)
#define nfserr_dirdeleg_unavail cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
#define nfserr_reject_deleg cpu_to_be32(NFS4ERR_REJECT_DELEG)
#define nfserr_returnconflict cpu_to_be32(NFS4ERR_RETURNCONFLICT)
#define nfserr_deleg_revoked cpu_to_be32(NFS4ERR_DELEG_REVOKED)
#define nfserr_partner_notsupp cpu_to_be32(NFS4ERR_PARTNER_NOTSUPP)
#define nfserr_partner_no_auth cpu_to_be32(NFS4ERR_PARTNER_NO_AUTH)
#define nfserr_union_notsupp cpu_to_be32(NFS4ERR_UNION_NOTSUPP)
#define nfserr_offload_denied cpu_to_be32(NFS4ERR_OFFLOAD_DENIED)
#define nfserr_wrong_lfs cpu_to_be32(NFS4ERR_WRONG_LFS)
#define nfserr_badlabel cpu_to_be32(NFS4ERR_BADLABEL)
#define nfserr_file_open cpu_to_be32(NFS4ERR_FILE_OPEN)
/* error codes for internal use */
/* if a request fails due to kmalloc failure, it gets dropped.
* Client should resend eventually
*/
#define nfserr_dropit cpu_to_be32(30000)
/* end-of-file indicator in readdir */
#define nfserr_eof cpu_to_be32(30001)
/* replay detected */
#define nfserr_replay_me cpu_to_be32(11001)
/* nfs41 replay detected */
#define nfserr_replay_cache cpu_to_be32(11002)
/* Check for dir entries '.' and '..' */
#define isdotent(n, l) (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
#ifdef CONFIG_NFSD_V4
/* before processing a COMPOUND operation, we have to check that there
* is enough space in the buffer for XDR encode to succeed. otherwise,
* we might process an operation with side effects, and be unable to
* tell the client that the operation succeeded.
*
* COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
* needed to encode an "ordinary" _successful_ operation. (GETATTR,
* READ, READDIR, and READLINK have their own buffer checks.) if we
* fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
*
* COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
* needed to encode an operation which has failed with NFS4ERR_RESOURCE.
* care is taken to ensure that we never fall below this level for any
* reason.
*/
#define COMPOUND_SLACK_SPACE 140 /* OP_GETFH */
#define COMPOUND_ERR_SLACK_SPACE 16 /* OP_SETATTR */
#define NFSD_LAUNDROMAT_MINTIMEOUT 1 /* seconds */
/*
* The following attributes are currently not supported by the NFSv4 server:
* ARCHIVE (deprecated anyway)
* HIDDEN (unlikely to be supported any time soon)
* MIMETYPE (unlikely to be supported any time soon)
* QUOTA_* (will be supported in a forthcoming patch)
* SYSTEM (unlikely to be supported any time soon)
* TIME_BACKUP (unlikely to be supported any time soon)
* TIME_CREATE (unlikely to be supported any time soon)
*/
#define NFSD4_SUPPORTED_ATTRS_WORD0 \
(FATTR4_WORD0_SUPPORTED_ATTRS | FATTR4_WORD0_TYPE | FATTR4_WORD0_FH_EXPIRE_TYPE \
| FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE | FATTR4_WORD0_LINK_SUPPORT \
| FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR | FATTR4_WORD0_FSID \
| FATTR4_WORD0_UNIQUE_HANDLES | FATTR4_WORD0_LEASE_TIME | FATTR4_WORD0_RDATTR_ERROR \
| FATTR4_WORD0_ACLSUPPORT | FATTR4_WORD0_CANSETTIME | FATTR4_WORD0_CASE_INSENSITIVE \
| FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED \
| FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FILEID | FATTR4_WORD0_FILES_AVAIL \
| FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS \
| FATTR4_WORD0_MAXFILESIZE | FATTR4_WORD0_MAXLINK | FATTR4_WORD0_MAXNAME \
| FATTR4_WORD0_MAXREAD | FATTR4_WORD0_MAXWRITE | FATTR4_WORD0_ACL)
#define NFSD4_SUPPORTED_ATTRS_WORD1 \
(FATTR4_WORD1_MODE | FATTR4_WORD1_NO_TRUNC | FATTR4_WORD1_NUMLINKS \
| FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP | FATTR4_WORD1_RAWDEV \
| FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | FATTR4_WORD1_SPACE_TOTAL \
| FATTR4_WORD1_SPACE_USED | FATTR4_WORD1_TIME_ACCESS | FATTR4_WORD1_TIME_ACCESS_SET \
| FATTR4_WORD1_TIME_DELTA | FATTR4_WORD1_TIME_METADATA \
| FATTR4_WORD1_TIME_MODIFY | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
#define NFSD4_SUPPORTED_ATTRS_WORD2 0
/* 4.1 */
#ifdef CONFIG_NFSD_PNFS
#define PNFSD_SUPPORTED_ATTRS_WORD1 FATTR4_WORD1_FS_LAYOUT_TYPES
#define PNFSD_SUPPORTED_ATTRS_WORD2 \
(FATTR4_WORD2_LAYOUT_BLKSIZE | FATTR4_WORD2_LAYOUT_TYPES)
#else
#define PNFSD_SUPPORTED_ATTRS_WORD1 0
#define PNFSD_SUPPORTED_ATTRS_WORD2 0
#endif /* CONFIG_NFSD_PNFS */
#define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
NFSD4_SUPPORTED_ATTRS_WORD0
#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
(NFSD4_SUPPORTED_ATTRS_WORD1 | PNFSD_SUPPORTED_ATTRS_WORD1)
#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
(NFSD4_SUPPORTED_ATTRS_WORD2 | PNFSD_SUPPORTED_ATTRS_WORD2 | \
FATTR4_WORD2_SUPPATTR_EXCLCREAT)
/* 4.2 */
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#define NFSD4_2_SECURITY_ATTRS FATTR4_WORD2_SECURITY_LABEL
#else
#define NFSD4_2_SECURITY_ATTRS 0
#endif
#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
(NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
FATTR4_WORD2_CHANGE_ATTR_TYPE | \
FATTR4_WORD2_MODE_UMASK | \
NFSD4_2_SECURITY_ATTRS)
extern const u32 nfsd_suppattrs[3][3];
static inline __be32 nfsd4_set_netaddr(struct sockaddr *addr,
struct nfs42_netaddr *netaddr)
{
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
unsigned int port;
size_t ret_addr, ret_port;
switch (addr->sa_family) {
case AF_INET:
port = ntohs(sin->sin_port);
sprintf(netaddr->netid, "tcp");
netaddr->netid_len = 3;
break;
case AF_INET6:
port = ntohs(sin6->sin6_port);
sprintf(netaddr->netid, "tcp6");
netaddr->netid_len = 4;
break;
default:
return nfserr_inval;
}
ret_addr = rpc_ntop(addr, netaddr->addr, sizeof(netaddr->addr));
ret_port = snprintf(netaddr->addr + ret_addr,
RPCBIND_MAXUADDRLEN + 1 - ret_addr,
".%u.%u", port >> 8, port & 0xff);
WARN_ON(ret_port >= RPCBIND_MAXUADDRLEN + 1 - ret_addr);
netaddr->addr_len = ret_addr + ret_port;
return 0;
}
static inline bool bmval_is_subset(const u32 *bm1, const u32 *bm2)
{
return !((bm1[0] & ~bm2[0]) ||
(bm1[1] & ~bm2[1]) ||
(bm1[2] & ~bm2[2]));
}
static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
{
return bmval_is_subset(bmval, nfsd_suppattrs[minorversion]);
}
/* These will return ERR_INVAL if specified in GETATTR or READDIR. */
#define NFSD_WRITEONLY_ATTRS_WORD1 \
(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
/*
* These are the only attrs allowed in CREATE/OPEN/SETATTR. Don't add
* a writeable attribute here without also adding code to parse it to
* nfsd4_decode_fattr().
*/
#define NFSD_WRITEABLE_ATTRS_WORD0 \
(FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
#define NFSD_WRITEABLE_ATTRS_WORD1 \
(FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
| FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#define MAYBE_FATTR4_WORD2_SECURITY_LABEL \
FATTR4_WORD2_SECURITY_LABEL
#else
#define MAYBE_FATTR4_WORD2_SECURITY_LABEL 0
#endif
#define NFSD_WRITEABLE_ATTRS_WORD2 \
(FATTR4_WORD2_MODE_UMASK \
| MAYBE_FATTR4_WORD2_SECURITY_LABEL)
#define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
NFSD_WRITEABLE_ATTRS_WORD0
/*
* we currently store the exclusive create verifier in the v_{a,m}time
* attributes so the client can't set these at create time using EXCLUSIVE4_1
*/
#define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
(NFSD_WRITEABLE_ATTRS_WORD1 & \
~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
#define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
NFSD_WRITEABLE_ATTRS_WORD2
extern int nfsd4_is_junction(struct dentry *dentry);
extern int register_cld_notifier(void);
extern void unregister_cld_notifier(void);
#else /* CONFIG_NFSD_V4 */
static inline int nfsd4_is_junction(struct dentry *dentry)
{
return 0;
}
#define register_cld_notifier() 0
#define unregister_cld_notifier() do { } while(0)
#endif /* CONFIG_NFSD_V4 */
#endif /* LINUX_NFSD_NFSD_H */
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