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android_kernel_samsung_msm8976/fs/nfsd/nfsd.h
J. Bruce Fields f9d7562fdb nfsd4: share file descriptors between stateid's 
The vfs doesn't really allow us to "upgrade" a file descriptor from
read-only to read-write, and our attempt to do so in nfs4_upgrade_open
is ugly and incomplete.

Move to a different scheme where we keep multiple opens, shared between
open stateid's, in the nfs4_file struct.  Each file will be opened at
most 3 times (for read, write, and read-write), and those opens will be
shared between all clients and openers.  On upgrade we will do another
open if necessary instead of attempting to upgrade an existing open.
We keep count of the number of readers and writers so we know when to
close the shared files.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-07-29 18:19:23 -04:00

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/*
* 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/nfsd/debug.h>
#include <linux/nfsd/export.h>
#include <linux/nfsd/stats.h>
/*
* nfsd version
*/
#define NFSD_SUPPORTED_MINOR_VERSION 1
struct readdir_cd {
__be32 err; /* 0, nfserr, or nfserr_eof */
};
extern struct svc_program nfsd_program;
extern struct svc_version nfsd_version2, nfsd_version3,
nfsd_version4;
extern u32 nfsd_supported_minorversion;
extern struct mutex nfsd_mutex;
extern struct svc_serv *nfsd_serv;
extern spinlock_t nfsd_drc_lock;
extern unsigned int nfsd_drc_max_mem;
extern unsigned int nfsd_drc_mem_used;
extern const struct seq_operations nfs_exports_op;
/*
* Function prototypes.
*/
int nfsd_svc(unsigned short port, int nrservs);
int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
int nfsd_nrthreads(void);
int nfsd_nrpools(void);
int nfsd_get_nrthreads(int n, int *);
int nfsd_set_nrthreads(int n, int *);
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
#ifdef CONFIG_NFSD_V2_ACL
extern struct svc_version nfsd_acl_version2;
#else
#define nfsd_acl_version2 NULL
#endif
#ifdef CONFIG_NFSD_V3_ACL
extern struct svc_version nfsd_acl_version3;
#else
#define nfsd_acl_version3 NULL
#endif
#endif
enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
int nfsd_vers(int vers, enum vers_op change);
int nfsd_minorversion(u32 minorversion, enum vers_op change);
void nfsd_reset_versions(void);
int nfsd_create_serv(void);
extern int nfsd_max_blksize;
static inline int nfsd_v4client(struct svc_rqst *rq)
{
return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
}
/*
* NFSv4 State
*/
#ifdef CONFIG_NFSD_V4
extern unsigned int max_delegations;
int nfs4_state_init(void);
void nfsd4_free_slabs(void);
int nfs4_state_start(void);
void nfs4_state_shutdown(void);
void nfs4_reset_lease(time_t leasetime);
int nfs4_reset_recoverydir(char *recdir);
#else
static inline int nfs4_state_init(void) { return 0; }
static inline void nfsd4_free_slabs(void) { }
static inline int nfs4_state_start(void) { return 0; }
static inline void nfs4_state_shutdown(void) { }
static inline void nfs4_reset_lease(time_t leasetime) { }
static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
#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_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)
/* 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] == '.'))
/*
* Time of server startup
*/
extern struct timeval nfssvc_boot;
#ifdef CONFIG_NFSD_V4
extern time_t nfsd4_lease;
extern time_t nfsd4_grace;
/* 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 12 /* OP_SETATTR */
#define NFSD_LAUNDROMAT_MINTIMEOUT 10 /* 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
#define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
NFSD4_SUPPORTED_ATTRS_WORD0
#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
NFSD4_SUPPORTED_ATTRS_WORD1
#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
(NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
static inline u32 nfsd_suppattrs0(u32 minorversion)
{
return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
: NFSD4_SUPPORTED_ATTRS_WORD0;
}
static inline u32 nfsd_suppattrs1(u32 minorversion)
{
return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
: NFSD4_SUPPORTED_ATTRS_WORD1;
}
static inline u32 nfsd_suppattrs2(u32 minorversion)
{
return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
: NFSD4_SUPPORTED_ATTRS_WORD2;
}
/* 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. */
#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)
#define NFSD_WRITEABLE_ATTRS_WORD2 0
#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
#endif /* CONFIG_NFSD_V4 */
#endif /* LINUX_NFSD_NFSD_H */
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