342 lines
7.0 KiB
C
342 lines
7.0 KiB
C
#ifndef QEMU_9P_H
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#define QEMU_9P_H
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#include <dirent.h>
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#include <utime.h>
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#include <sys/resource.h>
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#include "fsdev/file-op-9p.h"
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#include "fsdev/9p-iov-marshal.h"
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#include "qemu/thread.h"
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#include "qemu/coroutine.h"
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enum {
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P9_TLERROR = 6,
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P9_RLERROR,
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P9_TSTATFS = 8,
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P9_RSTATFS,
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P9_TLOPEN = 12,
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P9_RLOPEN,
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P9_TLCREATE = 14,
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P9_RLCREATE,
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P9_TSYMLINK = 16,
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P9_RSYMLINK,
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P9_TMKNOD = 18,
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P9_RMKNOD,
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P9_TRENAME = 20,
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P9_RRENAME,
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P9_TREADLINK = 22,
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P9_RREADLINK,
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P9_TGETATTR = 24,
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P9_RGETATTR,
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P9_TSETATTR = 26,
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P9_RSETATTR,
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P9_TXATTRWALK = 30,
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P9_RXATTRWALK,
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P9_TXATTRCREATE = 32,
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P9_RXATTRCREATE,
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P9_TREADDIR = 40,
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P9_RREADDIR,
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P9_TFSYNC = 50,
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P9_RFSYNC,
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P9_TLOCK = 52,
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P9_RLOCK,
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P9_TGETLOCK = 54,
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P9_RGETLOCK,
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P9_TLINK = 70,
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P9_RLINK,
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P9_TMKDIR = 72,
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P9_RMKDIR,
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P9_TRENAMEAT = 74,
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P9_RRENAMEAT,
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P9_TUNLINKAT = 76,
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P9_RUNLINKAT,
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P9_TVERSION = 100,
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P9_RVERSION,
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P9_TAUTH = 102,
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P9_RAUTH,
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P9_TATTACH = 104,
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P9_RATTACH,
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P9_TERROR = 106,
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P9_RERROR,
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P9_TFLUSH = 108,
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P9_RFLUSH,
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P9_TWALK = 110,
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P9_RWALK,
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P9_TOPEN = 112,
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P9_ROPEN,
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P9_TCREATE = 114,
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P9_RCREATE,
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P9_TREAD = 116,
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P9_RREAD,
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P9_TWRITE = 118,
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P9_RWRITE,
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P9_TCLUNK = 120,
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P9_RCLUNK,
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P9_TREMOVE = 122,
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P9_RREMOVE,
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P9_TSTAT = 124,
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P9_RSTAT,
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P9_TWSTAT = 126,
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P9_RWSTAT,
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};
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/* qid.types */
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enum {
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P9_QTDIR = 0x80,
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P9_QTAPPEND = 0x40,
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P9_QTEXCL = 0x20,
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P9_QTMOUNT = 0x10,
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P9_QTAUTH = 0x08,
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P9_QTTMP = 0x04,
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P9_QTSYMLINK = 0x02,
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P9_QTLINK = 0x01,
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P9_QTFILE = 0x00,
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};
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enum p9_proto_version {
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V9FS_PROTO_2000U = 0x01,
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V9FS_PROTO_2000L = 0x02,
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};
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#define P9_NOTAG (u16)(~0)
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#define P9_NOFID (u32)(~0)
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#define P9_MAXWELEM 16
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#define FID_REFERENCED 0x1
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#define FID_NON_RECLAIMABLE 0x2
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static inline char *rpath(FsContext *ctx, const char *path)
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{
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return g_strdup_printf("%s/%s", ctx->fs_root, path);
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}
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/*
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* ample room for Twrite/Rread header
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* size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
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*/
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#define P9_IOHDRSZ 24
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typedef struct V9fsPDU V9fsPDU;
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struct V9fsState;
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struct V9fsPDU
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{
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uint32_t size;
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uint16_t tag;
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uint8_t id;
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uint8_t cancelled;
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CoQueue complete;
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struct V9fsState *s;
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QLIST_ENTRY(V9fsPDU) next;
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uint32_t idx;
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};
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/* FIXME
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* 1) change user needs to set groups and stuff
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*/
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#define MAX_REQ 128
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#define MAX_TAG_LEN 32
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#define BUG_ON(cond) assert(!(cond))
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typedef struct V9fsFidState V9fsFidState;
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enum {
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P9_FID_NONE = 0,
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P9_FID_FILE,
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P9_FID_DIR,
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P9_FID_XATTR,
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};
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typedef struct V9fsConf
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{
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/* tag name for the device */
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char *tag;
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char *fsdev_id;
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} V9fsConf;
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typedef struct V9fsXattr
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{
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int64_t copied_len;
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int64_t len;
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void *value;
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V9fsString name;
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int flags;
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} V9fsXattr;
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typedef struct V9fsDir {
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DIR *stream;
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QemuMutex readdir_mutex;
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} V9fsDir;
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static inline void v9fs_readdir_lock(V9fsDir *dir)
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{
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qemu_mutex_lock(&dir->readdir_mutex);
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}
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static inline void v9fs_readdir_unlock(V9fsDir *dir)
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{
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qemu_mutex_unlock(&dir->readdir_mutex);
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}
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static inline void v9fs_readdir_init(V9fsDir *dir)
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{
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qemu_mutex_init(&dir->readdir_mutex);
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}
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/*
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* Filled by fs driver on open and other
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* calls.
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*/
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union V9fsFidOpenState {
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int fd;
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V9fsDir dir;
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V9fsXattr xattr;
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/*
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* private pointer for fs drivers, that
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* have its own internal representation of
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* open files.
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*/
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void *private;
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};
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struct V9fsFidState
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{
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int fid_type;
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int32_t fid;
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V9fsPath path;
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V9fsFidOpenState fs;
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V9fsFidOpenState fs_reclaim;
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int flags;
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int open_flags;
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uid_t uid;
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int ref;
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int clunked;
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V9fsFidState *next;
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V9fsFidState *rclm_lst;
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};
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typedef struct V9fsState
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{
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QLIST_HEAD(, V9fsPDU) free_list;
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QLIST_HEAD(, V9fsPDU) active_list;
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V9fsFidState *fid_list;
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FileOperations *ops;
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FsContext ctx;
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char *tag;
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enum p9_proto_version proto_version;
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int32_t msize;
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/*
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* lock ensuring atomic path update
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* on rename.
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*/
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CoRwlock rename_lock;
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int32_t root_fid;
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Error *migration_blocker;
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V9fsConf fsconf;
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} V9fsState;
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/* 9p2000.L open flags */
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#define P9_DOTL_RDONLY 00000000
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#define P9_DOTL_WRONLY 00000001
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#define P9_DOTL_RDWR 00000002
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#define P9_DOTL_NOACCESS 00000003
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#define P9_DOTL_CREATE 00000100
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#define P9_DOTL_EXCL 00000200
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#define P9_DOTL_NOCTTY 00000400
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#define P9_DOTL_TRUNC 00001000
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#define P9_DOTL_APPEND 00002000
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#define P9_DOTL_NONBLOCK 00004000
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#define P9_DOTL_DSYNC 00010000
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#define P9_DOTL_FASYNC 00020000
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#define P9_DOTL_DIRECT 00040000
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#define P9_DOTL_LARGEFILE 00100000
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#define P9_DOTL_DIRECTORY 00200000
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#define P9_DOTL_NOFOLLOW 00400000
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#define P9_DOTL_NOATIME 01000000
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#define P9_DOTL_CLOEXEC 02000000
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#define P9_DOTL_SYNC 04000000
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/* 9p2000.L at flags */
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#define P9_DOTL_AT_REMOVEDIR 0x200
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/* 9P2000.L lock type */
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#define P9_LOCK_TYPE_RDLCK 0
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#define P9_LOCK_TYPE_WRLCK 1
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#define P9_LOCK_TYPE_UNLCK 2
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#define P9_LOCK_SUCCESS 0
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#define P9_LOCK_BLOCKED 1
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#define P9_LOCK_ERROR 2
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#define P9_LOCK_GRACE 3
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#define P9_LOCK_FLAGS_BLOCK 1
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#define P9_LOCK_FLAGS_RECLAIM 2
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typedef struct V9fsFlock
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{
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uint8_t type;
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uint32_t flags;
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uint64_t start; /* absolute offset */
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uint64_t length;
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uint32_t proc_id;
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V9fsString client_id;
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} V9fsFlock;
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typedef struct V9fsGetlock
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{
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uint8_t type;
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uint64_t start; /* absolute offset */
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uint64_t length;
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uint32_t proc_id;
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V9fsString client_id;
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} V9fsGetlock;
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extern int open_fd_hw;
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extern int total_open_fd;
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static inline void v9fs_path_write_lock(V9fsState *s)
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{
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if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
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qemu_co_rwlock_wrlock(&s->rename_lock);
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}
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}
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static inline void v9fs_path_read_lock(V9fsState *s)
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{
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if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
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qemu_co_rwlock_rdlock(&s->rename_lock);
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}
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}
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static inline void v9fs_path_unlock(V9fsState *s)
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{
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if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
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qemu_co_rwlock_unlock(&s->rename_lock);
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}
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}
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static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
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{
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return pdu->cancelled;
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}
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extern void v9fs_reclaim_fd(V9fsPDU *pdu);
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extern void v9fs_path_init(V9fsPath *path);
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extern void v9fs_path_free(V9fsPath *path);
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extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
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extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
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const char *name, V9fsPath *path);
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extern int v9fs_device_realize_common(V9fsState *s, Error **errp);
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extern void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
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ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
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ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
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V9fsPDU *pdu_alloc(V9fsState *s);
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void pdu_free(V9fsPDU *pdu);
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void pdu_submit(V9fsPDU *pdu);
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#endif
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