1237 lines
35 KiB
C
1237 lines
35 KiB
C
/*
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* 9p Proxy callback
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* M. Mohan Kumar <mohan@in.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "qemu-common.h"
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#include "9p.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
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#include "fsdev/qemu-fsdev.h"
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#include "9p-proxy.h"
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typedef struct V9fsProxy {
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int sockfd;
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QemuMutex mutex;
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struct iovec in_iovec;
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struct iovec out_iovec;
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} V9fsProxy;
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/*
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* Return received file descriptor on success in *status.
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* errno is also returned on *status (which will be < 0)
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* return < 0 on transport error.
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*/
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static int v9fs_receivefd(int sockfd, int *status)
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{
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struct iovec iov;
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struct msghdr msg;
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struct cmsghdr *cmsg;
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int retval, data, fd;
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union MsgControl msg_control;
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iov.iov_base = &data;
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iov.iov_len = sizeof(data);
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memset(&msg, 0, sizeof(msg));
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = &msg_control;
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msg.msg_controllen = sizeof(msg_control);
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do {
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retval = recvmsg(sockfd, &msg, 0);
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} while (retval < 0 && errno == EINTR);
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if (retval <= 0) {
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return retval;
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}
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/*
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* data is set to V9FS_FD_VALID, if ancillary data is sent. If this
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* request doesn't need ancillary data (fd) or an error occurred,
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* data is set to negative errno value.
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*/
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if (data != V9FS_FD_VALID) {
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*status = data;
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return 0;
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}
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/*
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* File descriptor (fd) is sent in the ancillary data. Check if we
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* indeed received it. One of the reasons to fail to receive it is if
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* we exceeded the maximum number of file descriptors!
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*/
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) ||
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cmsg->cmsg_level != SOL_SOCKET ||
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cmsg->cmsg_type != SCM_RIGHTS) {
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continue;
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}
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fd = *((int *)CMSG_DATA(cmsg));
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*status = fd;
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return 0;
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}
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*status = -ENFILE; /* Ancillary data sent but not received */
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return 0;
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}
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static ssize_t socket_read(int sockfd, void *buff, size_t size)
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{
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ssize_t retval, total = 0;
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while (size) {
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retval = read(sockfd, buff, size);
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if (retval == 0) {
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return -EIO;
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}
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if (retval < 0) {
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if (errno == EINTR) {
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continue;
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}
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return -errno;
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}
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size -= retval;
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buff += retval;
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total += retval;
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}
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return total;
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}
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/* Converts proxy_statfs to VFS statfs structure */
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static void prstatfs_to_statfs(struct statfs *stfs, ProxyStatFS *prstfs)
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{
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memset(stfs, 0, sizeof(*stfs));
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stfs->f_type = prstfs->f_type;
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stfs->f_bsize = prstfs->f_bsize;
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stfs->f_blocks = prstfs->f_blocks;
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stfs->f_bfree = prstfs->f_bfree;
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stfs->f_bavail = prstfs->f_bavail;
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stfs->f_files = prstfs->f_files;
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stfs->f_ffree = prstfs->f_ffree;
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stfs->f_fsid.__val[0] = prstfs->f_fsid[0] & 0xFFFFFFFFU;
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stfs->f_fsid.__val[1] = prstfs->f_fsid[1] >> 32 & 0xFFFFFFFFU;
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stfs->f_namelen = prstfs->f_namelen;
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stfs->f_frsize = prstfs->f_frsize;
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}
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/* Converts proxy_stat structure to VFS stat structure */
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static void prstat_to_stat(struct stat *stbuf, ProxyStat *prstat)
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{
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memset(stbuf, 0, sizeof(*stbuf));
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stbuf->st_dev = prstat->st_dev;
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stbuf->st_ino = prstat->st_ino;
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stbuf->st_nlink = prstat->st_nlink;
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stbuf->st_mode = prstat->st_mode;
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stbuf->st_uid = prstat->st_uid;
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stbuf->st_gid = prstat->st_gid;
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stbuf->st_rdev = prstat->st_rdev;
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stbuf->st_size = prstat->st_size;
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stbuf->st_blksize = prstat->st_blksize;
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stbuf->st_blocks = prstat->st_blocks;
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stbuf->st_atim.tv_sec = prstat->st_atim_sec;
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stbuf->st_atim.tv_nsec = prstat->st_atim_nsec;
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stbuf->st_mtime = prstat->st_mtim_sec;
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stbuf->st_mtim.tv_nsec = prstat->st_mtim_nsec;
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stbuf->st_ctime = prstat->st_ctim_sec;
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stbuf->st_ctim.tv_nsec = prstat->st_ctim_nsec;
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}
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/*
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* Response contains two parts
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* {header, data}
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* header.type == T_ERROR, data -> -errno
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* header.type == T_SUCCESS, data -> response
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* size of errno/response is given by header.size
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* returns < 0, on transport error. response is
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* valid only if status >= 0.
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*/
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static int v9fs_receive_response(V9fsProxy *proxy, int type,
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int *status, void *response)
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{
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int retval;
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ProxyHeader header;
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struct iovec *reply = &proxy->in_iovec;
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*status = 0;
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reply->iov_len = 0;
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retval = socket_read(proxy->sockfd, reply->iov_base, PROXY_HDR_SZ);
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if (retval < 0) {
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return retval;
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}
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reply->iov_len = PROXY_HDR_SZ;
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retval = proxy_unmarshal(reply, 0, "dd", &header.type, &header.size);
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assert(retval == 4 * 2);
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/*
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* if response size > PROXY_MAX_IO_SZ, read the response but ignore it and
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* return -ENOBUFS
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*/
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if (header.size > PROXY_MAX_IO_SZ) {
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int count;
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while (header.size > 0) {
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count = MIN(PROXY_MAX_IO_SZ, header.size);
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count = socket_read(proxy->sockfd, reply->iov_base, count);
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if (count < 0) {
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return count;
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}
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header.size -= count;
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}
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*status = -ENOBUFS;
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return 0;
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}
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retval = socket_read(proxy->sockfd,
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reply->iov_base + PROXY_HDR_SZ, header.size);
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if (retval < 0) {
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return retval;
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}
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reply->iov_len += header.size;
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/* there was an error during processing request */
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if (header.type == T_ERROR) {
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int ret;
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ret = proxy_unmarshal(reply, PROXY_HDR_SZ, "d", status);
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assert(ret == 4);
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return 0;
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}
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switch (type) {
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case T_LSTAT: {
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ProxyStat prstat;
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retval = proxy_unmarshal(reply, PROXY_HDR_SZ,
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"qqqdddqqqqqqqqqq", &prstat.st_dev,
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&prstat.st_ino, &prstat.st_nlink,
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&prstat.st_mode, &prstat.st_uid,
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&prstat.st_gid, &prstat.st_rdev,
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&prstat.st_size, &prstat.st_blksize,
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&prstat.st_blocks,
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&prstat.st_atim_sec, &prstat.st_atim_nsec,
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&prstat.st_mtim_sec, &prstat.st_mtim_nsec,
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&prstat.st_ctim_sec, &prstat.st_ctim_nsec);
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assert(retval == 8 * 3 + 4 * 3 + 8 * 10);
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prstat_to_stat(response, &prstat);
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break;
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}
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case T_STATFS: {
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ProxyStatFS prstfs;
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retval = proxy_unmarshal(reply, PROXY_HDR_SZ,
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"qqqqqqqqqqq", &prstfs.f_type,
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&prstfs.f_bsize, &prstfs.f_blocks,
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&prstfs.f_bfree, &prstfs.f_bavail,
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&prstfs.f_files, &prstfs.f_ffree,
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&prstfs.f_fsid[0], &prstfs.f_fsid[1],
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&prstfs.f_namelen, &prstfs.f_frsize);
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assert(retval == 8 * 11);
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prstatfs_to_statfs(response, &prstfs);
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break;
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}
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case T_READLINK: {
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V9fsString target;
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v9fs_string_init(&target);
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retval = proxy_unmarshal(reply, PROXY_HDR_SZ, "s", &target);
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strcpy(response, target.data);
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v9fs_string_free(&target);
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break;
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}
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case T_LGETXATTR:
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case T_LLISTXATTR: {
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V9fsString xattr;
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v9fs_string_init(&xattr);
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retval = proxy_unmarshal(reply, PROXY_HDR_SZ, "s", &xattr);
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memcpy(response, xattr.data, xattr.size);
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v9fs_string_free(&xattr);
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break;
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}
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case T_GETVERSION:
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retval = proxy_unmarshal(reply, PROXY_HDR_SZ, "q", response);
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assert(retval == 8);
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break;
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default:
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return -1;
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}
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if (retval < 0) {
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*status = retval;
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}
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return 0;
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}
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/*
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* return < 0 on transport error.
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* *status is valid only if return >= 0
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*/
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static int v9fs_receive_status(V9fsProxy *proxy,
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struct iovec *reply, int *status)
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{
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int retval;
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ProxyHeader header;
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*status = 0;
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reply->iov_len = 0;
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retval = socket_read(proxy->sockfd, reply->iov_base, PROXY_HDR_SZ);
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if (retval < 0) {
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return retval;
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}
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reply->iov_len = PROXY_HDR_SZ;
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retval = proxy_unmarshal(reply, 0, "dd", &header.type, &header.size);
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assert(retval == 4 * 2);
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retval = socket_read(proxy->sockfd,
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reply->iov_base + PROXY_HDR_SZ, header.size);
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if (retval < 0) {
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return retval;
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}
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reply->iov_len += header.size;
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retval = proxy_unmarshal(reply, PROXY_HDR_SZ, "d", status);
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assert(retval == 4);
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return 0;
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}
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/*
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* Proxy->header and proxy->request written to socket by QEMU process.
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* This request read by proxy helper process
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* returns 0 on success and -errno on error
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*/
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static int v9fs_request(V9fsProxy *proxy, int type, void *response, ...)
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{
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dev_t rdev;
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va_list ap;
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int size = 0;
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int retval = 0;
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uint64_t offset;
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ProxyHeader header = { 0, 0};
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struct timespec spec[2];
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int flags, mode, uid, gid;
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V9fsString *name, *value;
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V9fsString *path, *oldpath;
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struct iovec *iovec = NULL, *reply = NULL;
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qemu_mutex_lock(&proxy->mutex);
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if (proxy->sockfd == -1) {
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retval = -EIO;
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goto err_out;
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}
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iovec = &proxy->out_iovec;
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reply = &proxy->in_iovec;
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va_start(ap, response);
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switch (type) {
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case T_OPEN:
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path = va_arg(ap, V9fsString *);
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flags = va_arg(ap, int);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sd", path, flags);
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if (retval > 0) {
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header.size = retval;
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header.type = T_OPEN;
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}
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break;
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case T_CREATE:
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path = va_arg(ap, V9fsString *);
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flags = va_arg(ap, int);
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mode = va_arg(ap, int);
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uid = va_arg(ap, int);
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gid = va_arg(ap, int);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sdddd", path,
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flags, mode, uid, gid);
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if (retval > 0) {
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header.size = retval;
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header.type = T_CREATE;
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}
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break;
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case T_MKNOD:
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path = va_arg(ap, V9fsString *);
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mode = va_arg(ap, int);
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rdev = va_arg(ap, long int);
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uid = va_arg(ap, int);
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gid = va_arg(ap, int);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ddsdq",
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uid, gid, path, mode, rdev);
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if (retval > 0) {
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header.size = retval;
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header.type = T_MKNOD;
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}
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break;
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case T_MKDIR:
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path = va_arg(ap, V9fsString *);
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mode = va_arg(ap, int);
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uid = va_arg(ap, int);
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gid = va_arg(ap, int);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ddsd",
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uid, gid, path, mode);
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if (retval > 0) {
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header.size = retval;
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header.type = T_MKDIR;
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}
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break;
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case T_SYMLINK:
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oldpath = va_arg(ap, V9fsString *);
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path = va_arg(ap, V9fsString *);
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uid = va_arg(ap, int);
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gid = va_arg(ap, int);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ddss",
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uid, gid, oldpath, path);
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if (retval > 0) {
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header.size = retval;
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header.type = T_SYMLINK;
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}
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break;
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case T_LINK:
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oldpath = va_arg(ap, V9fsString *);
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path = va_arg(ap, V9fsString *);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ss",
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oldpath, path);
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if (retval > 0) {
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header.size = retval;
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header.type = T_LINK;
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}
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break;
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case T_LSTAT:
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path = va_arg(ap, V9fsString *);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "s", path);
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if (retval > 0) {
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header.size = retval;
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header.type = T_LSTAT;
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}
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break;
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case T_READLINK:
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path = va_arg(ap, V9fsString *);
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size = va_arg(ap, int);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sd", path, size);
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if (retval > 0) {
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header.size = retval;
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header.type = T_READLINK;
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}
|
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break;
|
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case T_STATFS:
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path = va_arg(ap, V9fsString *);
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "s", path);
|
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if (retval > 0) {
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header.size = retval;
|
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header.type = T_STATFS;
|
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}
|
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break;
|
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case T_CHMOD:
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path = va_arg(ap, V9fsString *);
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mode = va_arg(ap, int);
|
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sd", path, mode);
|
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if (retval > 0) {
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header.size = retval;
|
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header.type = T_CHMOD;
|
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}
|
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break;
|
|
case T_CHOWN:
|
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path = va_arg(ap, V9fsString *);
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uid = va_arg(ap, int);
|
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gid = va_arg(ap, int);
|
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sdd", path, uid, gid);
|
|
if (retval > 0) {
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header.size = retval;
|
|
header.type = T_CHOWN;
|
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}
|
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break;
|
|
case T_TRUNCATE:
|
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path = va_arg(ap, V9fsString *);
|
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offset = va_arg(ap, uint64_t);
|
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sq", path, offset);
|
|
if (retval > 0) {
|
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header.size = retval;
|
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header.type = T_TRUNCATE;
|
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}
|
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break;
|
|
case T_UTIME:
|
|
path = va_arg(ap, V9fsString *);
|
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spec[0].tv_sec = va_arg(ap, long);
|
|
spec[0].tv_nsec = va_arg(ap, long);
|
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spec[1].tv_sec = va_arg(ap, long);
|
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spec[1].tv_nsec = va_arg(ap, long);
|
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sqqqq", path,
|
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spec[0].tv_sec, spec[1].tv_nsec,
|
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spec[1].tv_sec, spec[1].tv_nsec);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_UTIME;
|
|
}
|
|
break;
|
|
case T_RENAME:
|
|
oldpath = va_arg(ap, V9fsString *);
|
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path = va_arg(ap, V9fsString *);
|
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ss", oldpath, path);
|
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if (retval > 0) {
|
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header.size = retval;
|
|
header.type = T_RENAME;
|
|
}
|
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break;
|
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case T_REMOVE:
|
|
path = va_arg(ap, V9fsString *);
|
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retval = proxy_marshal(iovec, PROXY_HDR_SZ, "s", path);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_REMOVE;
|
|
}
|
|
break;
|
|
case T_LGETXATTR:
|
|
size = va_arg(ap, int);
|
|
path = va_arg(ap, V9fsString *);
|
|
name = va_arg(ap, V9fsString *);
|
|
retval = proxy_marshal(iovec, PROXY_HDR_SZ,
|
|
"dss", size, path, name);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_LGETXATTR;
|
|
}
|
|
break;
|
|
case T_LLISTXATTR:
|
|
size = va_arg(ap, int);
|
|
path = va_arg(ap, V9fsString *);
|
|
retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ds", size, path);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_LLISTXATTR;
|
|
}
|
|
break;
|
|
case T_LSETXATTR:
|
|
path = va_arg(ap, V9fsString *);
|
|
name = va_arg(ap, V9fsString *);
|
|
value = va_arg(ap, V9fsString *);
|
|
size = va_arg(ap, int);
|
|
flags = va_arg(ap, int);
|
|
retval = proxy_marshal(iovec, PROXY_HDR_SZ, "sssdd",
|
|
path, name, value, size, flags);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_LSETXATTR;
|
|
}
|
|
break;
|
|
case T_LREMOVEXATTR:
|
|
path = va_arg(ap, V9fsString *);
|
|
name = va_arg(ap, V9fsString *);
|
|
retval = proxy_marshal(iovec, PROXY_HDR_SZ, "ss", path, name);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_LREMOVEXATTR;
|
|
}
|
|
break;
|
|
case T_GETVERSION:
|
|
path = va_arg(ap, V9fsString *);
|
|
retval = proxy_marshal(iovec, PROXY_HDR_SZ, "s", path);
|
|
if (retval > 0) {
|
|
header.size = retval;
|
|
header.type = T_GETVERSION;
|
|
}
|
|
break;
|
|
default:
|
|
error_report("Invalid type %d", type);
|
|
retval = -EINVAL;
|
|
break;
|
|
}
|
|
va_end(ap);
|
|
|
|
if (retval < 0) {
|
|
goto err_out;
|
|
}
|
|
|
|
/* marshal the header details */
|
|
proxy_marshal(iovec, 0, "dd", header.type, header.size);
|
|
header.size += PROXY_HDR_SZ;
|
|
|
|
retval = qemu_write_full(proxy->sockfd, iovec->iov_base, header.size);
|
|
if (retval != header.size) {
|
|
goto close_error;
|
|
}
|
|
|
|
switch (type) {
|
|
case T_OPEN:
|
|
case T_CREATE:
|
|
/*
|
|
* A file descriptor is returned as response for
|
|
* T_OPEN,T_CREATE on success
|
|
*/
|
|
if (v9fs_receivefd(proxy->sockfd, &retval) < 0) {
|
|
goto close_error;
|
|
}
|
|
break;
|
|
case T_MKNOD:
|
|
case T_MKDIR:
|
|
case T_SYMLINK:
|
|
case T_LINK:
|
|
case T_CHMOD:
|
|
case T_CHOWN:
|
|
case T_RENAME:
|
|
case T_TRUNCATE:
|
|
case T_UTIME:
|
|
case T_REMOVE:
|
|
case T_LSETXATTR:
|
|
case T_LREMOVEXATTR:
|
|
if (v9fs_receive_status(proxy, reply, &retval) < 0) {
|
|
goto close_error;
|
|
}
|
|
break;
|
|
case T_LSTAT:
|
|
case T_READLINK:
|
|
case T_STATFS:
|
|
case T_GETVERSION:
|
|
if (v9fs_receive_response(proxy, type, &retval, response) < 0) {
|
|
goto close_error;
|
|
}
|
|
break;
|
|
case T_LGETXATTR:
|
|
case T_LLISTXATTR:
|
|
if (!size) {
|
|
if (v9fs_receive_status(proxy, reply, &retval) < 0) {
|
|
goto close_error;
|
|
}
|
|
} else {
|
|
if (v9fs_receive_response(proxy, type, &retval, response) < 0) {
|
|
goto close_error;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
err_out:
|
|
qemu_mutex_unlock(&proxy->mutex);
|
|
return retval;
|
|
|
|
close_error:
|
|
close(proxy->sockfd);
|
|
proxy->sockfd = -1;
|
|
qemu_mutex_unlock(&proxy->mutex);
|
|
return -EIO;
|
|
}
|
|
|
|
static int proxy_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(fs_ctx->private, T_LSTAT, stbuf, fs_path);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
return -1;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t proxy_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
|
|
char *buf, size_t bufsz)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(fs_ctx->private, T_READLINK, buf, fs_path, bufsz);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
return -1;
|
|
}
|
|
return strlen(buf);
|
|
}
|
|
|
|
static int proxy_close(FsContext *ctx, V9fsFidOpenState *fs)
|
|
{
|
|
return close(fs->fd);
|
|
}
|
|
|
|
static int proxy_closedir(FsContext *ctx, V9fsFidOpenState *fs)
|
|
{
|
|
return closedir(fs->dir.stream);
|
|
}
|
|
|
|
static int proxy_open(FsContext *ctx, V9fsPath *fs_path,
|
|
int flags, V9fsFidOpenState *fs)
|
|
{
|
|
fs->fd = v9fs_request(ctx->private, T_OPEN, NULL, fs_path, flags);
|
|
if (fs->fd < 0) {
|
|
errno = -fs->fd;
|
|
fs->fd = -1;
|
|
}
|
|
return fs->fd;
|
|
}
|
|
|
|
static int proxy_opendir(FsContext *ctx,
|
|
V9fsPath *fs_path, V9fsFidOpenState *fs)
|
|
{
|
|
int serrno, fd;
|
|
|
|
fs->dir.stream = NULL;
|
|
fd = v9fs_request(ctx->private, T_OPEN, NULL, fs_path, O_DIRECTORY);
|
|
if (fd < 0) {
|
|
errno = -fd;
|
|
return -1;
|
|
}
|
|
fs->dir.stream = fdopendir(fd);
|
|
if (!fs->dir.stream) {
|
|
serrno = errno;
|
|
close(fd);
|
|
errno = serrno;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void proxy_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
|
|
{
|
|
rewinddir(fs->dir.stream);
|
|
}
|
|
|
|
static off_t proxy_telldir(FsContext *ctx, V9fsFidOpenState *fs)
|
|
{
|
|
return telldir(fs->dir.stream);
|
|
}
|
|
|
|
static struct dirent *proxy_readdir(FsContext *ctx, V9fsFidOpenState *fs)
|
|
{
|
|
return readdir(fs->dir.stream);
|
|
}
|
|
|
|
static void proxy_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
|
|
{
|
|
seekdir(fs->dir.stream, off);
|
|
}
|
|
|
|
static ssize_t proxy_preadv(FsContext *ctx, V9fsFidOpenState *fs,
|
|
const struct iovec *iov,
|
|
int iovcnt, off_t offset)
|
|
{
|
|
ssize_t ret;
|
|
#ifdef CONFIG_PREADV
|
|
ret = preadv(fs->fd, iov, iovcnt, offset);
|
|
#else
|
|
ret = lseek(fs->fd, offset, SEEK_SET);
|
|
if (ret >= 0) {
|
|
ret = readv(fs->fd, iov, iovcnt);
|
|
}
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t proxy_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
|
|
const struct iovec *iov,
|
|
int iovcnt, off_t offset)
|
|
{
|
|
ssize_t ret;
|
|
|
|
#ifdef CONFIG_PREADV
|
|
ret = pwritev(fs->fd, iov, iovcnt, offset);
|
|
#else
|
|
ret = lseek(fs->fd, offset, SEEK_SET);
|
|
if (ret >= 0) {
|
|
ret = writev(fs->fd, iov, iovcnt);
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_SYNC_FILE_RANGE
|
|
if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
|
|
/*
|
|
* Initiate a writeback. This is not a data integrity sync.
|
|
* We want to ensure that we don't leave dirty pages in the cache
|
|
* after write when writeout=immediate is sepcified.
|
|
*/
|
|
sync_file_range(fs->fd, offset, ret,
|
|
SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
|
|
}
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static int proxy_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(fs_ctx->private, T_CHMOD, NULL, fs_path,
|
|
credp->fc_mode);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
|
|
const char *name, FsCred *credp)
|
|
{
|
|
int retval;
|
|
V9fsString fullname;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
|
|
retval = v9fs_request(fs_ctx->private, T_MKNOD, NULL, &fullname,
|
|
credp->fc_mode, credp->fc_rdev,
|
|
credp->fc_uid, credp->fc_gid);
|
|
v9fs_string_free(&fullname);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
retval = -1;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
|
|
const char *name, FsCred *credp)
|
|
{
|
|
int retval;
|
|
V9fsString fullname;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
|
|
retval = v9fs_request(fs_ctx->private, T_MKDIR, NULL, &fullname,
|
|
credp->fc_mode, credp->fc_uid, credp->fc_gid);
|
|
v9fs_string_free(&fullname);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
retval = -1;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_fstat(FsContext *fs_ctx, int fid_type,
|
|
V9fsFidOpenState *fs, struct stat *stbuf)
|
|
{
|
|
int fd;
|
|
|
|
if (fid_type == P9_FID_DIR) {
|
|
fd = dirfd(fs->dir.stream);
|
|
} else {
|
|
fd = fs->fd;
|
|
}
|
|
return fstat(fd, stbuf);
|
|
}
|
|
|
|
static int proxy_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
|
|
int flags, FsCred *credp, V9fsFidOpenState *fs)
|
|
{
|
|
V9fsString fullname;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
|
|
fs->fd = v9fs_request(fs_ctx->private, T_CREATE, NULL, &fullname, flags,
|
|
credp->fc_mode, credp->fc_uid, credp->fc_gid);
|
|
v9fs_string_free(&fullname);
|
|
if (fs->fd < 0) {
|
|
errno = -fs->fd;
|
|
fs->fd = -1;
|
|
}
|
|
return fs->fd;
|
|
}
|
|
|
|
static int proxy_symlink(FsContext *fs_ctx, const char *oldpath,
|
|
V9fsPath *dir_path, const char *name, FsCred *credp)
|
|
{
|
|
int retval;
|
|
V9fsString fullname, target;
|
|
|
|
v9fs_string_init(&fullname);
|
|
v9fs_string_init(&target);
|
|
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
|
|
v9fs_string_sprintf(&target, "%s", oldpath);
|
|
|
|
retval = v9fs_request(fs_ctx->private, T_SYMLINK, NULL, &target, &fullname,
|
|
credp->fc_uid, credp->fc_gid);
|
|
v9fs_string_free(&fullname);
|
|
v9fs_string_free(&target);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
retval = -1;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_link(FsContext *ctx, V9fsPath *oldpath,
|
|
V9fsPath *dirpath, const char *name)
|
|
{
|
|
int retval;
|
|
V9fsString newpath;
|
|
|
|
v9fs_string_init(&newpath);
|
|
v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
|
|
|
|
retval = v9fs_request(ctx->private, T_LINK, NULL, oldpath, &newpath);
|
|
v9fs_string_free(&newpath);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
retval = -1;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
|
|
{
|
|
int retval;
|
|
|
|
retval = v9fs_request(ctx->private, T_TRUNCATE, NULL, fs_path, size);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int proxy_rename(FsContext *ctx, const char *oldpath,
|
|
const char *newpath)
|
|
{
|
|
int retval;
|
|
V9fsString oldname, newname;
|
|
|
|
v9fs_string_init(&oldname);
|
|
v9fs_string_init(&newname);
|
|
|
|
v9fs_string_sprintf(&oldname, "%s", oldpath);
|
|
v9fs_string_sprintf(&newname, "%s", newpath);
|
|
retval = v9fs_request(ctx->private, T_RENAME, NULL, &oldname, &newname);
|
|
v9fs_string_free(&oldname);
|
|
v9fs_string_free(&newname);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(fs_ctx->private, T_CHOWN, NULL, fs_path,
|
|
credp->fc_uid, credp->fc_gid);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_utimensat(FsContext *s, V9fsPath *fs_path,
|
|
const struct timespec *buf)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(s->private, T_UTIME, NULL, fs_path,
|
|
buf[0].tv_sec, buf[0].tv_nsec,
|
|
buf[1].tv_sec, buf[1].tv_nsec);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_remove(FsContext *ctx, const char *path)
|
|
{
|
|
int retval;
|
|
V9fsString name;
|
|
v9fs_string_init(&name);
|
|
v9fs_string_sprintf(&name, "%s", path);
|
|
retval = v9fs_request(ctx->private, T_REMOVE, NULL, &name);
|
|
v9fs_string_free(&name);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_fsync(FsContext *ctx, int fid_type,
|
|
V9fsFidOpenState *fs, int datasync)
|
|
{
|
|
int fd;
|
|
|
|
if (fid_type == P9_FID_DIR) {
|
|
fd = dirfd(fs->dir.stream);
|
|
} else {
|
|
fd = fs->fd;
|
|
}
|
|
|
|
if (datasync) {
|
|
return qemu_fdatasync(fd);
|
|
} else {
|
|
return fsync(fd);
|
|
}
|
|
}
|
|
|
|
static int proxy_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(s->private, T_STATFS, stbuf, fs_path);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
return -1;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t proxy_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
|
|
const char *name, void *value, size_t size)
|
|
{
|
|
int retval;
|
|
V9fsString xname;
|
|
|
|
v9fs_string_init(&xname);
|
|
v9fs_string_sprintf(&xname, "%s", name);
|
|
retval = v9fs_request(ctx->private, T_LGETXATTR, value, size, fs_path,
|
|
&xname);
|
|
v9fs_string_free(&xname);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t proxy_llistxattr(FsContext *ctx, V9fsPath *fs_path,
|
|
void *value, size_t size)
|
|
{
|
|
int retval;
|
|
retval = v9fs_request(ctx->private, T_LLISTXATTR, value, size, fs_path);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
|
|
void *value, size_t size, int flags)
|
|
{
|
|
int retval;
|
|
V9fsString xname, xvalue;
|
|
|
|
v9fs_string_init(&xname);
|
|
v9fs_string_sprintf(&xname, "%s", name);
|
|
|
|
v9fs_string_init(&xvalue);
|
|
xvalue.size = size;
|
|
xvalue.data = g_malloc(size);
|
|
memcpy(xvalue.data, value, size);
|
|
|
|
retval = v9fs_request(ctx->private, T_LSETXATTR, value, fs_path, &xname,
|
|
&xvalue, size, flags);
|
|
v9fs_string_free(&xname);
|
|
v9fs_string_free(&xvalue);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
|
|
const char *name)
|
|
{
|
|
int retval;
|
|
V9fsString xname;
|
|
|
|
v9fs_string_init(&xname);
|
|
v9fs_string_sprintf(&xname, "%s", name);
|
|
retval = v9fs_request(ctx->private, T_LREMOVEXATTR, NULL, fs_path, &xname);
|
|
v9fs_string_free(&xname);
|
|
if (retval < 0) {
|
|
errno = -retval;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static int proxy_name_to_path(FsContext *ctx, V9fsPath *dir_path,
|
|
const char *name, V9fsPath *target)
|
|
{
|
|
if (dir_path) {
|
|
v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
|
|
} else {
|
|
v9fs_path_sprintf(target, "%s", name);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int proxy_renameat(FsContext *ctx, V9fsPath *olddir,
|
|
const char *old_name, V9fsPath *newdir,
|
|
const char *new_name)
|
|
{
|
|
int ret;
|
|
V9fsString old_full_name, new_full_name;
|
|
|
|
v9fs_string_init(&old_full_name);
|
|
v9fs_string_init(&new_full_name);
|
|
|
|
v9fs_string_sprintf(&old_full_name, "%s/%s", olddir->data, old_name);
|
|
v9fs_string_sprintf(&new_full_name, "%s/%s", newdir->data, new_name);
|
|
|
|
ret = proxy_rename(ctx, old_full_name.data, new_full_name.data);
|
|
v9fs_string_free(&old_full_name);
|
|
v9fs_string_free(&new_full_name);
|
|
return ret;
|
|
}
|
|
|
|
static int proxy_unlinkat(FsContext *ctx, V9fsPath *dir,
|
|
const char *name, int flags)
|
|
{
|
|
int ret;
|
|
V9fsString fullname;
|
|
v9fs_string_init(&fullname);
|
|
|
|
v9fs_string_sprintf(&fullname, "%s/%s", dir->data, name);
|
|
ret = proxy_remove(ctx, fullname.data);
|
|
v9fs_string_free(&fullname);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int proxy_ioc_getversion(FsContext *fs_ctx, V9fsPath *path,
|
|
mode_t st_mode, uint64_t *st_gen)
|
|
{
|
|
int err;
|
|
|
|
/* Do not try to open special files like device nodes, fifos etc
|
|
* we can get fd for regular files and directories only
|
|
*/
|
|
if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
|
|
errno = ENOTTY;
|
|
return -1;
|
|
}
|
|
err = v9fs_request(fs_ctx->private, T_GETVERSION, st_gen, path);
|
|
if (err < 0) {
|
|
errno = -err;
|
|
err = -1;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int connect_namedsocket(const char *path, Error **errp)
|
|
{
|
|
int sockfd;
|
|
struct sockaddr_un helper;
|
|
|
|
if (strlen(path) >= sizeof(helper.sun_path)) {
|
|
error_setg(errp, "socket name too long");
|
|
return -1;
|
|
}
|
|
sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (sockfd < 0) {
|
|
error_setg_errno(errp, errno, "failed to create client socket");
|
|
return -1;
|
|
}
|
|
strcpy(helper.sun_path, path);
|
|
helper.sun_family = AF_UNIX;
|
|
if (connect(sockfd, (struct sockaddr *)&helper, sizeof(helper)) < 0) {
|
|
error_setg_errno(errp, errno, "failed to connect to '%s'", path);
|
|
close(sockfd);
|
|
return -1;
|
|
}
|
|
|
|
/* remove the socket for security reasons */
|
|
unlink(path);
|
|
return sockfd;
|
|
}
|
|
|
|
static void error_append_socket_sockfd_hint(Error *const *errp)
|
|
{
|
|
error_append_hint(errp, "Either specify socket=/some/path where /some/path"
|
|
" points to a listening AF_UNIX socket or sock_fd=fd"
|
|
" where fd is a file descriptor to a connected AF_UNIX"
|
|
" socket\n");
|
|
}
|
|
|
|
static int proxy_parse_opts(QemuOpts *opts, FsDriverEntry *fs, Error **errp)
|
|
{
|
|
const char *socket = qemu_opt_get(opts, "socket");
|
|
const char *sock_fd = qemu_opt_get(opts, "sock_fd");
|
|
|
|
if (!socket && !sock_fd) {
|
|
error_setg(errp, "both socket and sock_fd properties are missing");
|
|
error_append_socket_sockfd_hint(errp);
|
|
return -1;
|
|
}
|
|
if (socket && sock_fd) {
|
|
error_setg(errp, "both socket and sock_fd properties are set");
|
|
error_append_socket_sockfd_hint(errp);
|
|
return -1;
|
|
}
|
|
if (socket) {
|
|
fs->path = g_strdup(socket);
|
|
fs->export_flags |= V9FS_PROXY_SOCK_NAME;
|
|
} else {
|
|
fs->path = g_strdup(sock_fd);
|
|
fs->export_flags |= V9FS_PROXY_SOCK_FD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int proxy_init(FsContext *ctx, Error **errp)
|
|
{
|
|
V9fsProxy *proxy = g_malloc(sizeof(V9fsProxy));
|
|
int sock_id;
|
|
|
|
if (ctx->export_flags & V9FS_PROXY_SOCK_NAME) {
|
|
sock_id = connect_namedsocket(ctx->fs_root, errp);
|
|
} else {
|
|
sock_id = atoi(ctx->fs_root);
|
|
if (sock_id < 0) {
|
|
error_setg(errp, "socket descriptor not initialized");
|
|
}
|
|
}
|
|
if (sock_id < 0) {
|
|
g_free(proxy);
|
|
return -1;
|
|
}
|
|
g_free(ctx->fs_root);
|
|
ctx->fs_root = NULL;
|
|
|
|
proxy->in_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
|
|
proxy->in_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
|
|
proxy->out_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
|
|
proxy->out_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
|
|
|
|
ctx->private = proxy;
|
|
proxy->sockfd = sock_id;
|
|
qemu_mutex_init(&proxy->mutex);
|
|
|
|
ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
|
|
ctx->exops.get_st_gen = proxy_ioc_getversion;
|
|
return 0;
|
|
}
|
|
|
|
static void proxy_cleanup(FsContext *ctx)
|
|
{
|
|
V9fsProxy *proxy = ctx->private;
|
|
|
|
if (!proxy) {
|
|
return;
|
|
}
|
|
|
|
g_free(proxy->out_iovec.iov_base);
|
|
g_free(proxy->in_iovec.iov_base);
|
|
if (ctx->export_flags & V9FS_PROXY_SOCK_NAME) {
|
|
close(proxy->sockfd);
|
|
}
|
|
g_free(proxy);
|
|
}
|
|
|
|
FileOperations proxy_ops = {
|
|
.parse_opts = proxy_parse_opts,
|
|
.init = proxy_init,
|
|
.cleanup = proxy_cleanup,
|
|
.lstat = proxy_lstat,
|
|
.readlink = proxy_readlink,
|
|
.close = proxy_close,
|
|
.closedir = proxy_closedir,
|
|
.open = proxy_open,
|
|
.opendir = proxy_opendir,
|
|
.rewinddir = proxy_rewinddir,
|
|
.telldir = proxy_telldir,
|
|
.readdir = proxy_readdir,
|
|
.seekdir = proxy_seekdir,
|
|
.preadv = proxy_preadv,
|
|
.pwritev = proxy_pwritev,
|
|
.chmod = proxy_chmod,
|
|
.mknod = proxy_mknod,
|
|
.mkdir = proxy_mkdir,
|
|
.fstat = proxy_fstat,
|
|
.open2 = proxy_open2,
|
|
.symlink = proxy_symlink,
|
|
.link = proxy_link,
|
|
.truncate = proxy_truncate,
|
|
.rename = proxy_rename,
|
|
.chown = proxy_chown,
|
|
.utimensat = proxy_utimensat,
|
|
.remove = proxy_remove,
|
|
.fsync = proxy_fsync,
|
|
.statfs = proxy_statfs,
|
|
.lgetxattr = proxy_lgetxattr,
|
|
.llistxattr = proxy_llistxattr,
|
|
.lsetxattr = proxy_lsetxattr,
|
|
.lremovexattr = proxy_lremovexattr,
|
|
.name_to_path = proxy_name_to_path,
|
|
.renameat = proxy_renameat,
|
|
.unlinkat = proxy_unlinkat,
|
|
};
|