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NetBSD/sys/fs/puffs/puffs_msgif.h

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/* $NetBSD: puffs_msgif.h,v 1.18 2007/01/16 22:38:19 pooka Exp $ */
/*
* Copyright (c) 2005, 2006 Antti Kantee. All Rights Reserved.
*
* Development of this software was supported by the
* Google Summer of Code program and the Ulla Tuominen Foundation.
* The Google SoC project was mentored by Bill Studenmund.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _PUFFS_MSGIF_H_
#define _PUFFS_MSGIF_H_
#include <sys/param.h>
#include <sys/time.h>
#include <sys/ioccom.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/ucred.h>
#include <sys/statvfs.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#define PUFFSOP_VFS 1
#define PUFFSOP_VN 2
#define PUFFSOPFLAG_FAF 0x10 /* fire-and-forget */
#define PUFFSOP_OPCMASK 0x03
#define PUFFSOP_OPCLASS(a) ((a) & PUFFSOP_OPCMASK)
#define PUFFSOP_WANTREPLY(a) (((a) & PUFFSOPFLAG_FAF) == 0)
/* XXX: we don't need everything */
enum {
PUFFS_VFS_MOUNT, PUFFS_VFS_START, PUFFS_VFS_UNMOUNT,
PUFFS_VFS_ROOT, PUFFS_VFS_STATVFS, PUFFS_VFS_SYNC,
PUFFS_VFS_VGET, PUFFS_VFS_FHTOVP, PUFFS_VFS_VPTOFH,
PUFFS_VFS_INIT, PUFFS_VFS_DONE, PUFFS_VFS_SNAPSHOT,
PUFFS_VFS_EXTATTCTL
};
#define PUFFS_VFS_MAX PUFFS_VFS_EXTATTCTL
/* moreXXX: we don't need everything here either */
enum {
PUFFS_VN_LOOKUP, PUFFS_VN_CREATE, PUFFS_VN_MKNOD,
PUFFS_VN_OPEN, PUFFS_VN_CLOSE, PUFFS_VN_ACCESS,
PUFFS_VN_GETATTR, PUFFS_VN_SETATTR, PUFFS_VN_READ,
PUFFS_VN_WRITE, PUFFS_VN_IOCTL, PUFFS_VN_FCNTL,
PUFFS_VN_POLL, PUFFS_VN_KQFILTER, PUFFS_VN_REVOKE,
PUFFS_VN_MMAP, PUFFS_VN_FSYNC, PUFFS_VN_SEEK,
PUFFS_VN_REMOVE, PUFFS_VN_LINK, PUFFS_VN_RENAME,
PUFFS_VN_MKDIR, PUFFS_VN_RMDIR, PUFFS_VN_SYMLINK,
PUFFS_VN_READDIR, PUFFS_VN_READLINK, PUFFS_VN_ABORTOP,
PUFFS_VN_INACTIVE, PUFFS_VN_RECLAIM, PUFFS_VN_LOCK,
PUFFS_VN_UNLOCK, PUFFS_VN_BMAP, PUFFS_VN_STRATEGY,
PUFFS_VN_PRINT, PUFFS_VN_ISLOCKED, PUFFS_VN_PATHCONF,
PUFFS_VN_ADVLOCK, PUFFS_VN_LEASE, PUFFS_VN_WHITEOUT,
PUFFS_VN_GETPAGES, PUFFS_VN_PUTPAGES, PUFFS_VN_GETEXTATTR,
PUFFS_VN_LISTEXTATTR, PUFFS_VN_OPENEXTATTR, PUFFS_VN_DELETEEXTATTR,
PUFFS_VN_SETEXTATTR
};
#define PUFFS_VN_MAX PUFFS_VN_SETEXTATTR
#define PUFFSDEVELVERS 0x80000000
#define PUFFSVERSION 2
#define PUFFSNAMESIZE 32
struct puffs_args {
unsigned int pa_vers;
int pa_fd;
uint32_t pa_flags;
size_t pa_maxreqlen;
char pa_name[PUFFSNAMESIZE+1]; /* name for puffs type */
uint8_t pa_vnopmask[PUFFS_VN_MAX];
};
#define PUFFS_KFLAG_ALLOWCTL 0x01 /* ioctl/fcntl commands allowed */
#define PUFFS_KFLAG_NOCACHE 0x02 /* flush page cache immediately */
#define PUFFS_KFLAG_ALLOPS 0x04 /* ignore pa_vnopmask, send all */
#define PUFFS_KFLAG_MASK 0x07
/*
* This is the device minor number for the cloning device. Make it
* a high number "just in case", even though we don't want to open
* any specific devices currently.
*/
#define PUFFS_CLONER 0x7ffff
struct puffs_reqh_get {
void *phg_buf; /* user buffer */
size_t phg_buflen; /* user buffer length */
int phg_nops; /* max ops user wants / number delivered */
int phg_more; /* advisory: more ops available? */
};
struct puffs_reqh_put {
int php_nops; /* ops available / ops handled */
/* these describe the first request */
uint64_t php_id; /* request id */
void *php_buf; /* user buffer address */
size_t php_buflen; /* user buffer length, hdr NOT incl. */
};
/*
* The requests work as follows:
*
* + GETOP: When fetching operations from the kernel, the user server
* supplies a flat buffer into which operations are written.
* The number of operations written to the buffer is
* MIN(prhg_nops, requests waiting, space in buffer).
*
* Operations follow each other and each one is described
* by the puffs_req structure, which is immediately followed
* by the aligned request data buffer in preq_buf. The next
* puffs_req can be found at preq + preq_buflen.
*
* Visually, the server should expect:
*
* |<-- preq_buflen -->|
* ---------------------------------------------------------------
* |hdr| buffer |align|hdr| buffer |hdr| .... |buffer| |
* ---------------------------------------------------------------
* ^ start ^ unaligned ^ aligned ^ always aligned
*
* The server is allowed to modify the contents of the buffers.
* Since the headers are the same size for both get and put, it
* is possible to handle all operations simply by doing in-place
* modification. Where more input is expected that what was put
* out, the kernel leaves a hole in the buffer. This hole size
* is derived from the operational semantics known by the vnode
* layer. The hole size is included in preq_buflen. The
* amount of relevant information in the buffer is call-specific
* and can be deduced by the server from the call type.
*
* + PUTOP: When returning the results of an operation to the kernel, the
* user server is allowed to input results in a scatter-gather
* fashion. Each request is made up of a header and the buffer.
* The header describes the *NEXT* request for copyin, *NOT* the
* current one. The first request is described in puffs_reqh_put
* and the last one is left uninterpreted. This is to halve the
* amount of copyin's required.
*
* Fans of my ascii art, rejoice:
* /-------------------->| preq_buflen |
* ---^----------------------------------------------------------
* |hdr|buffer| empty spaces |hdr| buffer | |
* --v-----------------------^-v---------------------------------
* \------- preq_buf -----/ \------- preq_buf ....
*
* This scheme also allows for better in-place modification of the
* request buffer when handling requests. The vision is that
* operations which can be immediately satisfied will be edited
* in-place while ones which can't will be left blank. Also,
* requests from async operations which have been satisfied
* meanwhile can be included.
*
* The total number of operations is given by the ioctl control
* structure puffs_reqh. The values in the header in the final
* are not used.
*/
struct puffs_req {
uint64_t preq_id; /* get: cur, put: next */
union u {
struct {
uint8_t opclass; /* cur */
uint8_t optype; /* cur */
/*
* preq_cookie is the node cookie associated with
* the request. It always maps 1:1 to a vnode
* and could map to a userspace struct puffs_node.
* The cookie usually describes the first
* vnode argument of the VOP_POP() in question.
*/
void *cookie; /* cur */
} out;
struct {
int rv; /* cur */
void *buf; /* next */
} in;
} u;
size_t preq_buflen; /* get: cur, put: next */
/*
* the following helper pads the struct size to md alignment
* multiple (should size_t not cut it). it makes sure that
* whatever comes after this struct is aligned
*/
uint8_t preq_buf[0] __aligned(ALIGNBYTES+1);
};
#define preq_opclass u.out.opclass
#define preq_optype u.out.optype
#define preq_cookie u.out.cookie
#define preq_rv u.in.rv
#define preq_nextbuf u.in.buf
/*
* Some operations have unknown size requirements. So as the first
* stab at handling it, do an extra bounce between the kernel and
* userspace.
*/
struct puffs_sizeop {
uint64_t pso_reqid;
uint8_t *pso_userbuf;
size_t pso_bufsize;
};
/*
* Flush operation. This can be used to invalidate:
* 1) name cache for one node
* 2) name cache for all children
* 3) name cache for the entire mount
* 4) page cache for a set of ranges in one node
* 5) page cache for one entire node
*
* It can be used to flush:
* 1) page cache for a set of ranges in one node
* 2) page cache for one entire node
*/
/* XXX: only namecache DIR and ALL are currently implemented */
struct puffs_flush {
void *pf_cookie;
int pf_op;
};
#define PUFFS_INVAL_NAMECACHE_NODE 0
#define PUFFS_INVAL_NAMECACHE_DIR 1
#define PUFFS_INVAL_NAMECACHE_ALL 2
#define PUFFS_INVAL_PAGECACHE_NODE_RANGE 3
#define PUFFS_INVAL_PAGECACHE_NODE 4
#define PUFFS_FLUSH_PAGECACHE_NODE_RANGE 5
#define PUFFS_FLUSH_PAGECACHE_NODE 6
/*
* Available ioctl operations
*/
#define PUFFSSTARTOP _IOWR('p', 1, struct puffs_startreq)
#define PUFFSGETOP _IOWR('p', 2, struct puffs_reqh_get)
#define PUFFSPUTOP _IOWR('p', 3, struct puffs_reqh_put)
#define PUFFSSIZEOP _IOWR('p', 4, struct puffs_sizeop)
#define PUFFSFLUSHOP _IOW ('p', 5, struct puffs_flush)
#if 0
#define PUFFSFLUSHMULTIOP _IOW ('p', 6, struct puffs_flushmulti)
#endif
/*
* Credentials for an operation. Can be either struct uucred for
* ops called from a credential context or NOCRED/FSCRED for ops
* called from within the kernel. It is up to the implementation
* if it makes a difference between these two and the super-user.
*/
struct puffs_cred {
struct uucred pcr_uuc;
uint8_t pcr_type;
uint8_t pcr_internal;
};
#define PUFFCRED_TYPE_UUC 1
#define PUFFCRED_TYPE_INTERNAL 2
#define PUFFCRED_CRED_NOCRED 1
#define PUFFCRED_CRED_FSCRED 2
/*
* 4x MAXPHYS is the max size the system will attempt to copy,
* else treated as garbage
*/
#define PUFFS_REQ_MAXSIZE 4*MAXPHYS
#define PUFFS_REQSTRUCT_MAX 4096 /* XXX: approxkludge */
#define PUFFS_TOMOVE(a,b) (MIN((a), b->pmp_req_maxsize - PUFFS_REQSTRUCT_MAX))
/* puffs struct componentname built by kernel */
struct puffs_kcn {
/* args */
u_long pkcn_nameiop; /* namei operation */
u_long pkcn_flags; /* flags */
pid_t pkcn_pid; /* caller pid */
struct puffs_cred pkcn_cred; /* caller creds */
char pkcn_name[MAXPATHLEN+1]; /* nul-terminated path component */
long pkcn_namelen;
};
/*
* XXX: figure out what to do with these, copied from namei.h for now
*/
#define PUFFSLOOKUP_LOOKUP 0 /* perform name lookup only */
#define PUFFSLOOKUP_CREATE 1 /* setup for file creation */
#define PUFFSLOOKUP_DELETE 2 /* setup for file deletion */
#define PUFFSLOOKUP_RENAME 3 /* setup for file renaming */
#define PUFFSLOOKUP_OPMASK 3 /* mask for operation */
#define PUFFSLOOKUP_FOLLOW 0x04 /* follow final symlink */
#define PUFFSLOOKUP_NOFOLLOW 0x08 /* don't follow final symlink */
#define PUFFSLOOKUP_OPTIONS 0x0c
/*
* Next come the individual requests. They are all subclassed from
* puffs_req and contain request-specific fields in addition. Note
* that there are some requests which have to handle arbitrary-length
* buffers.
*
* The division is the following: puffs_req is to be touched only
* by generic routines while the other stuff is supposed to be
* modified only by specific routines.
*/
struct puffs_startreq {
struct puffs_req psr_pr;
void *psr_cookie; /* IN: root node cookie */
struct statvfs psr_sb; /* IN: statvfs buffer */
};
/*
* aux structures for vfs operations.
*/
struct puffs_vfsreq_unmount {
struct puffs_req pvfsr_pr;
int pvfsr_flags;
pid_t pvfsr_pid;
};
struct puffs_vfsreq_statvfs {
struct puffs_req pvfsr_pr;
struct statvfs pvfsr_sb;
pid_t pvfsr_pid;
};
struct puffs_vfsreq_sync {
struct puffs_req pvfsr_pr;
struct puffs_cred pvfsr_cred;
pid_t pvfsr_pid;
int pvfsr_waitfor;
};
/*
* aux structures for vnode operations.
*/
struct puffs_vnreq_lookup {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
void *pvnr_newnode; /* IN */
enum vtype pvnr_vtype; /* IN */
voff_t pvnr_size; /* IN */
dev_t pvnr_rdev; /* IN */
};
struct puffs_vnreq_create {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
struct vattr pvnr_va; /* OUT */
void *pvnr_newnode; /* IN */
};
struct puffs_vnreq_mknod {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
struct vattr pvnr_va; /* OUT */
void *pvnr_newnode; /* IN */
};
struct puffs_vnreq_open {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
pid_t pvnr_pid; /* OUT */
int pvnr_mode; /* OUT */
};
struct puffs_vnreq_close {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
pid_t pvnr_pid; /* OUT */
int pvnr_fflag; /* OUT */
};
struct puffs_vnreq_access {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
pid_t pvnr_pid; /* OUT */
int pvnr_mode; /* OUT */
};
#define puffs_vnreq_setattr puffs_vnreq_setgetattr
#define puffs_vnreq_getattr puffs_vnreq_setgetattr
struct puffs_vnreq_setgetattr {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
struct vattr pvnr_va; /* IN/OUT (op depend) */
pid_t pvnr_pid; /* OUT */
};
#define puffs_vnreq_read puffs_vnreq_readwrite
#define puffs_vnreq_write puffs_vnreq_readwrite
struct puffs_vnreq_readwrite {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
off_t pvnr_offset; /* OUT */
size_t pvnr_resid; /* IN/OUT */
int pvnr_ioflag; /* OUT */
uint8_t pvnr_data[0]; /* IN/OUT (wr/rd) */
};
#define puffs_vnreq_ioctl puffs_vnreq_fcnioctl
#define puffs_vnreq_fcntl puffs_vnreq_fcnioctl
struct puffs_vnreq_fcnioctl {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred;
u_long pvnr_command;
pid_t pvnr_pid;
int pvnr_fflag;
void *pvnr_data;
size_t pvnr_datalen;
int pvnr_copyback;
};
struct puffs_vnreq_poll {
struct puffs_req pvn_pr;
int pvnr_events; /* OUT */
pid_t pvnr_pid; /* OUT */
};
struct puffs_vnreq_fsync {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
off_t pvnr_offlo; /* OUT */
off_t pvnr_offhi; /* OUT */
pid_t pvnr_pid; /* OUT */
int pvnr_flags; /* OUT */
};
struct puffs_vnreq_seek {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
off_t pvnr_oldoff; /* OUT */
off_t pvnr_newoff; /* OUT */
};
struct puffs_vnreq_remove {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
void *pvnr_cookie_targ; /* OUT */
};
struct puffs_vnreq_mkdir {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
struct vattr pvnr_va; /* OUT */
void *pvnr_newnode; /* IN */
};
struct puffs_vnreq_rmdir {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
void *pvnr_cookie_targ; /* OUT */
};
struct puffs_vnreq_link {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
void *pvnr_cookie_targ; /* OUT */
};
struct puffs_vnreq_rename {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn_src; /* OUT */
struct puffs_kcn pvnr_cn_targ; /* OUT */
void *pvnr_cookie_src; /* OUT */
void *pvnr_cookie_targ; /* OUT */
void *pvnr_cookie_targdir; /* OUT */
};
struct puffs_vnreq_symlink {
struct puffs_req pvn_pr;
struct puffs_kcn pvnr_cn; /* OUT */
struct vattr pvnr_va; /* OUT */
void *pvnr_newnode; /* IN */
char pvnr_link[MAXPATHLEN]; /* OUT */
};
struct puffs_vnreq_readdir {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
off_t pvnr_offset; /* IN/OUT */
size_t pvnr_resid; /* IN/OUT */
struct dirent pvnr_dent[0]; /* IN */
};
struct puffs_vnreq_readlink {
struct puffs_req pvn_pr;
struct puffs_cred pvnr_cred; /* OUT */
size_t pvnr_linklen; /* IN */
char pvnr_link[MAXPATHLEN]; /* IN, XXX */
};
struct puffs_vnreq_reclaim {
struct puffs_req pvn_pr;
pid_t pvnr_pid; /* OUT */
};
struct puffs_vnreq_inactive {
struct puffs_req pvn_pr;
pid_t pvnr_pid; /* OUT */
int pvnr_backendrefs; /* IN */
};
struct puffs_vnreq_print {
struct puffs_req pvn_pr;
/* empty */
};
struct puffs_vnreq_pathconf {
struct puffs_req pvn_pr;
int pvnr_name; /* OUT */
int pvnr_retval; /* IN */
};
struct puffs_vnreq_advlock {
struct puffs_req pvn_pr;
struct flock pvnr_fl; /* OUT */
void *pvnr_id; /* OUT */
int pvnr_op; /* OUT */
int pvnr_flags; /* OUT */
};
struct puffs_vnreq_mmap {
struct puffs_req pvn_pr;
int pvnr_fflags; /* OUT */
struct puffs_cred pvnr_cred; /* OUT */
pid_t pvnr_pid; /* OUT */
};
/* notyet */
#if 0
struct puffs_vnreq_kqfilter { };
struct puffs_vnreq_islocked { };
struct puffs_vnreq_lease { };
#endif
struct puffs_vnreq_getpages { };
struct puffs_vnreq_putpages { };
struct puffs_vnreq_getextattr { };
struct puffs_vnreq_setextattr { };
struct puffs_vnreq_listextattr { };
#ifdef _KERNEL
#define PUFFS_VFSREQ(a) \
struct puffs_vfsreq_##a a##_arg; \
memset(&a##_arg, 0, sizeof(struct puffs_vfsreq_##a))
#define PUFFS_VNREQ(a) \
struct puffs_vnreq_##a a##_arg; \
memset(&a##_arg, 0, sizeof(struct puffs_vnreq_##a))
#endif
#endif /* _PUFFS_MSGIF_H_ */
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