00ede4c252
SYNOPSIS
size[4] Tgetattr tag[2] fid[4] request_mask[8]
size[4] Rgetattr tag[2] lstat[n]
DESCRIPTION
The getattr transaction inquires about the file identified by fid.
request_mask is a bit mask that specifies which fields of the
stat structure is the client interested in.
The reply will contain a machine-independent directory entry,
laid out as follows:
st_result_mask[8]
Bit mask that indicates which fields in the stat structure
have been populated by the server
qid.type[1]
the type of the file (directory, etc.), represented as a bit
vector corresponding to the high 8 bits of the file's mode
word.
qid.vers[4]
version number for given path
qid.path[8]
the file server's unique identification for the file
st_mode[4]
Permission and flags
st_uid[4]
User id of owner
st_gid[4]
Group ID of owner
st_nlink[8]
Number of hard links
st_rdev[8]
Device ID (if special file)
st_size[8]
Size, in bytes
st_blksize[8]
Block size for file system IO
st_blocks[8]
Number of file system blocks allocated
st_atime_sec[8]
Time of last access, seconds
st_atime_nsec[8]
Time of last access, nanoseconds
st_mtime_sec[8]
Time of last modification, seconds
st_mtime_nsec[8]
Time of last modification, nanoseconds
st_ctime_sec[8]
Time of last status change, seconds
st_ctime_nsec[8]
Time of last status change, nanoseconds
st_btime_sec[8]
Time of creation (birth) of file, seconds
st_btime_nsec[8]
Time of creation (birth) of file, nanoseconds
st_gen[8]
Inode generation
st_data_version[8]
Data version number
request_mask and result_mask bit masks contain the following bits
#define P9_STATS_MODE 0x00000001ULL
#define P9_STATS_NLINK 0x00000002ULL
#define P9_STATS_UID 0x00000004ULL
#define P9_STATS_GID 0x00000008ULL
#define P9_STATS_RDEV 0x00000010ULL
#define P9_STATS_ATIME 0x00000020ULL
#define P9_STATS_MTIME 0x00000040ULL
#define P9_STATS_CTIME 0x00000080ULL
#define P9_STATS_INO 0x00000100ULL
#define P9_STATS_SIZE 0x00000200ULL
#define P9_STATS_BLOCKS 0x00000400ULL
#define P9_STATS_BTIME 0x00000800ULL
#define P9_STATS_GEN 0x00001000ULL
#define P9_STATS_DATA_VERSION 0x00002000ULL
#define P9_STATS_BASIC 0x000007ffULL
#define P9_STATS_ALL 0x00003fffULL
This patch implements the client side of getattr implementation for 9P2000.L.
It introduces a new structure p9_stat_dotl for getting Linux stat information
along with QID. The data layout is similar to stat structure in Linux user
space with the following major differences:
inode (st_ino) is not part of data. Instead qid is.
device (st_dev) is not part of data because this doesn't make sense on the
client.
All time variables are 64 bit wide on the wire. The kernel seems to use
32 bit variables for these variables. However, some of the architectures
have used 64 bit variables and glibc exposes 64 bit variables to user
space on some architectures. Hence to be on the safer side we have made
these 64 bit in the protocol. Refer to the comments in
include/asm-generic/stat.h
There are some additional fields: st_btime_sec, st_btime_nsec, st_gen,
st_data_version apart from the bitmask, st_result_mask. The bit mask
is filled by the server to indicate which stat fields have been
populated by the server. Currently there is no clean way for the
server to obtain these additional fields, so it sends back just the
basic fields.
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
333 lines
6.3 KiB
C
333 lines
6.3 KiB
C
#ifndef _QEMU_VIRTIO_9P_H
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#define _QEMU_VIRTIO_9P_H
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#include <sys/types.h>
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#include <dirent.h>
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#include <sys/time.h>
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#include <utime.h>
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#include "file-op-9p.h"
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/* The feature bitmap for virtio 9P */
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/* The mount point is specified in a config variable */
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#define VIRTIO_9P_MOUNT_TAG 0
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enum {
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P9_TSTATFS = 8,
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P9_RSTATFS,
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P9_TGETATTR = 24,
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P9_RGETATTR,
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P9_TREADDIR = 40,
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P9_RREADDIR,
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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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/*
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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 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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VirtQueueElement elem;
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QLIST_ENTRY(V9fsPDU) next;
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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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/* from Linux's linux/virtio_9p.h */
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/* The ID for virtio console */
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#define VIRTIO_ID_9P 9
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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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typedef struct V9fsString
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{
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int16_t size;
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char *data;
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} V9fsString;
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typedef struct V9fsQID
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{
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int8_t type;
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int32_t version;
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int64_t path;
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} V9fsQID;
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typedef struct V9fsStat
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{
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int16_t size;
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int16_t type;
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int32_t dev;
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V9fsQID qid;
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int32_t mode;
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int32_t atime;
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int32_t mtime;
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int64_t length;
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V9fsString name;
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V9fsString uid;
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V9fsString gid;
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V9fsString muid;
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/* 9p2000.u */
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V9fsString extension;
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int32_t n_uid;
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int32_t n_gid;
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int32_t n_muid;
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} V9fsStat;
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struct V9fsFidState
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{
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int32_t fid;
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V9fsString path;
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int fd;
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DIR *dir;
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uid_t uid;
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V9fsFidState *next;
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};
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typedef struct V9fsState
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{
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VirtIODevice vdev;
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VirtQueue *vq;
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V9fsPDU pdus[MAX_REQ];
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QLIST_HEAD(, V9fsPDU) free_list;
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V9fsFidState *fid_list;
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FileOperations *ops;
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FsContext ctx;
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uint16_t tag_len;
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uint8_t *tag;
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size_t config_size;
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enum p9_proto_version proto_version;
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int32_t msize;
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} V9fsState;
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typedef struct V9fsCreateState {
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V9fsPDU *pdu;
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size_t offset;
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V9fsFidState *fidp;
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V9fsQID qid;
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int32_t perm;
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int8_t mode;
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struct stat stbuf;
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V9fsString name;
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V9fsString extension;
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V9fsString fullname;
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int iounit;
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} V9fsCreateState;
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typedef struct V9fsStatState {
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V9fsPDU *pdu;
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size_t offset;
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V9fsStat v9stat;
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V9fsFidState *fidp;
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struct stat stbuf;
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} V9fsStatState;
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typedef struct V9fsStatDotl {
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uint64_t st_result_mask;
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V9fsQID qid;
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uint32_t st_mode;
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uint32_t st_uid;
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uint32_t st_gid;
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uint64_t st_nlink;
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uint64_t st_rdev;
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uint64_t st_size;
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uint64_t st_blksize;
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uint64_t st_blocks;
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uint64_t st_atime_sec;
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uint64_t st_atime_nsec;
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uint64_t st_mtime_sec;
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uint64_t st_mtime_nsec;
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uint64_t st_ctime_sec;
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uint64_t st_ctime_nsec;
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uint64_t st_btime_sec;
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uint64_t st_btime_nsec;
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uint64_t st_gen;
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uint64_t st_data_version;
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} V9fsStatDotl;
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typedef struct V9fsStatStateDotl {
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V9fsPDU *pdu;
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size_t offset;
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V9fsStatDotl v9stat_dotl;
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struct stat stbuf;
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} V9fsStatStateDotl;
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typedef struct V9fsWalkState {
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V9fsPDU *pdu;
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size_t offset;
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int16_t nwnames;
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int name_idx;
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V9fsQID *qids;
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V9fsFidState *fidp;
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V9fsFidState *newfidp;
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V9fsString path;
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V9fsString *wnames;
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struct stat stbuf;
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} V9fsWalkState;
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typedef struct V9fsOpenState {
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V9fsPDU *pdu;
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size_t offset;
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int8_t mode;
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V9fsFidState *fidp;
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V9fsQID qid;
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struct stat stbuf;
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int iounit;
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} V9fsOpenState;
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typedef struct V9fsReadState {
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V9fsPDU *pdu;
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size_t offset;
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int32_t count;
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int32_t total;
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int64_t off;
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V9fsFidState *fidp;
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struct iovec iov[128]; /* FIXME: bad, bad, bad */
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struct iovec *sg;
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off_t dir_pos;
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struct dirent *dent;
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struct stat stbuf;
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V9fsString name;
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V9fsStat v9stat;
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int32_t len;
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int32_t cnt;
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int32_t max_count;
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} V9fsReadState;
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typedef struct V9fsWriteState {
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V9fsPDU *pdu;
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size_t offset;
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int32_t len;
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int32_t count;
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int32_t total;
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int64_t off;
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V9fsFidState *fidp;
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struct iovec iov[128]; /* FIXME: bad, bad, bad */
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struct iovec *sg;
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int cnt;
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} V9fsWriteState;
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typedef struct V9fsRemoveState {
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V9fsPDU *pdu;
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size_t offset;
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V9fsFidState *fidp;
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} V9fsRemoveState;
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typedef struct V9fsWstatState
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{
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V9fsPDU *pdu;
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size_t offset;
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int16_t unused;
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V9fsStat v9stat;
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V9fsFidState *fidp;
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struct stat stbuf;
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V9fsString nname;
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} V9fsWstatState;
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struct virtio_9p_config
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{
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/* number of characters in tag */
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uint16_t tag_len;
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/* Variable size tag name */
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uint8_t tag[0];
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} __attribute__((packed));
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typedef struct V9fsStatfs
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{
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uint32_t f_type;
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uint32_t f_bsize;
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uint64_t f_blocks;
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uint64_t f_bfree;
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uint64_t f_bavail;
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uint64_t f_files;
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uint64_t f_ffree;
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uint64_t fsid_val;
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uint32_t f_namelen;
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} V9fsStatfs;
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typedef struct V9fsStatfsState {
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V9fsPDU *pdu;
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size_t offset;
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int32_t fid;
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V9fsStatfs v9statfs;
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V9fsFidState *fidp;
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struct statfs stbuf;
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} V9fsStatfsState;
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extern size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
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size_t offset, size_t size, int pack);
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static inline size_t do_pdu_unpack(void *dst, struct iovec *sg, int sg_count,
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size_t offset, size_t size)
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{
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return pdu_packunpack(dst, sg, sg_count, offset, size, 0);
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}
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#endif
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