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hw/9pfs: Add stat/readlink/statfs for proxy FS
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Signed-off-by: M. Mohan Kumar <[email protected]>
Signed-off-by: Aneesh Kumar K.V <[email protected]>
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@kvaneesh
M. Mohan Kumar authored and kvaneesh committed Jan 4, 2012
1 parent 39f8c32 commit b178adc
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Showing 3 changed files with 414 additions and 8 deletions.
182 changes: 182 additions & 0 deletions fsdev/virtfs-proxy-helper.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@
#include <sys/fsuid.h>
#include <stdarg.h>
#include <stdbool.h>
#include <sys/vfs.h>
#include <sys/stat.h>
#include "qemu-common.h"
#include "virtio-9p-marshal.h"
#include "hw/9pfs/virtio-9p-proxy.h"
Expand Down Expand Up @@ -285,6 +287,172 @@ static int setfsugid(int uid, int gid)
return 0;
}

/*
* send response in two parts
* 1) ProxyHeader
* 2) Response or error status
* This function should be called with marshaled response
* send_response constructs header part and error part only.
* send response sends {ProxyHeader,Response} if the request was success
* otherwise sends {ProxyHeader,error status}
*/
static int send_response(int sock, struct iovec *iovec, int size)
{
int retval;
ProxyHeader header;

/*
* If response size exceeds available iovec->iov_len,
* we return ENOBUFS
*/
if (size > PROXY_MAX_IO_SZ) {
size = -ENOBUFS;
}

if (size < 0) {
/*
* In case of error we would not have got the error encoded
* already so encode the error here.
*/
header.type = T_ERROR;
header.size = sizeof(size);
proxy_marshal(iovec, PROXY_HDR_SZ, "d", size);
} else {
header.type = T_SUCCESS;
header.size = size;
}
proxy_marshal(iovec, 0, "dd", header.type, header.size);
retval = socket_write(sock, iovec->iov_base, header.size + PROXY_HDR_SZ);
if (retval < 0) {
return retval;;
}
return 0;
}

static void stat_to_prstat(ProxyStat *pr_stat, struct stat *stat)
{
memset(pr_stat, 0, sizeof(*pr_stat));
pr_stat->st_dev = stat->st_dev;
pr_stat->st_ino = stat->st_ino;
pr_stat->st_nlink = stat->st_nlink;
pr_stat->st_mode = stat->st_mode;
pr_stat->st_uid = stat->st_uid;
pr_stat->st_gid = stat->st_gid;
pr_stat->st_rdev = stat->st_rdev;
pr_stat->st_size = stat->st_size;
pr_stat->st_blksize = stat->st_blksize;
pr_stat->st_blocks = stat->st_blocks;
pr_stat->st_atim_sec = stat->st_atim.tv_sec;
pr_stat->st_atim_nsec = stat->st_atim.tv_nsec;
pr_stat->st_mtim_sec = stat->st_mtim.tv_sec;
pr_stat->st_mtim_nsec = stat->st_mtim.tv_nsec;
pr_stat->st_ctim_sec = stat->st_ctim.tv_sec;
pr_stat->st_ctim_nsec = stat->st_ctim.tv_nsec;
}

static void statfs_to_prstatfs(ProxyStatFS *pr_stfs, struct statfs *stfs)
{
memset(pr_stfs, 0, sizeof(*pr_stfs));
pr_stfs->f_type = stfs->f_type;
pr_stfs->f_bsize = stfs->f_bsize;
pr_stfs->f_blocks = stfs->f_blocks;
pr_stfs->f_bfree = stfs->f_bfree;
pr_stfs->f_bavail = stfs->f_bavail;
pr_stfs->f_files = stfs->f_files;
pr_stfs->f_ffree = stfs->f_ffree;
pr_stfs->f_fsid[0] = stfs->f_fsid.__val[0];
pr_stfs->f_fsid[1] = stfs->f_fsid.__val[1];
pr_stfs->f_namelen = stfs->f_namelen;
pr_stfs->f_frsize = stfs->f_frsize;
}

/*
* Gets stat/statfs information and packs in out_iovec structure
* on success returns number of bytes packed in out_iovec struture
* otherwise returns -errno
*/
static int do_stat(int type, struct iovec *iovec, struct iovec *out_iovec)
{
int retval;
V9fsString path;
ProxyStat pr_stat;
ProxyStatFS pr_stfs;
struct stat st_buf;
struct statfs stfs_buf;

v9fs_string_init(&path);
retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "s", &path);
if (retval < 0) {
return retval;
}

switch (type) {
case T_LSTAT:
retval = lstat(path.data, &st_buf);
if (retval < 0) {
retval = -errno;
} else {
stat_to_prstat(&pr_stat, &st_buf);
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ,
"qqqdddqqqqqqqqqq", pr_stat.st_dev,
pr_stat.st_ino, pr_stat.st_nlink,
pr_stat.st_mode, pr_stat.st_uid,
pr_stat.st_gid, pr_stat.st_rdev,
pr_stat.st_size, pr_stat.st_blksize,
pr_stat.st_blocks,
pr_stat.st_atim_sec, pr_stat.st_atim_nsec,
pr_stat.st_mtim_sec, pr_stat.st_mtim_nsec,
pr_stat.st_ctim_sec, pr_stat.st_ctim_nsec);
}
break;
case T_STATFS:
retval = statfs(path.data, &stfs_buf);
if (retval < 0) {
retval = -errno;
} else {
statfs_to_prstatfs(&pr_stfs, &stfs_buf);
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ,
"qqqqqqqqqqq", pr_stfs.f_type,
pr_stfs.f_bsize, pr_stfs.f_blocks,
pr_stfs.f_bfree, pr_stfs.f_bavail,
pr_stfs.f_files, pr_stfs.f_ffree,
pr_stfs.f_fsid[0], pr_stfs.f_fsid[1],
pr_stfs.f_namelen, pr_stfs.f_frsize);
}
break;
}
v9fs_string_free(&path);
return retval;
}

static int do_readlink(struct iovec *iovec, struct iovec *out_iovec)
{
char *buffer;
int size, retval;
V9fsString target, path;

v9fs_string_init(&path);
retval = proxy_unmarshal(iovec, PROXY_HDR_SZ, "sd", &path, &size);
if (retval < 0) {
v9fs_string_free(&path);
return retval;
}
buffer = g_malloc(size);
v9fs_string_init(&target);
retval = readlink(path.data, buffer, size);
if (retval > 0) {
buffer[retval] = '\0';
v9fs_string_sprintf(&target, "%s", buffer);
retval = proxy_marshal(out_iovec, PROXY_HDR_SZ, "s", &target);
} else {
retval = -errno;
}
g_free(buffer);
v9fs_string_free(&target);
v9fs_string_free(&path);
return retval;
}

/*
* create other filesystem objects and send 0 on success
* return -errno on error
Expand Down Expand Up @@ -435,6 +603,13 @@ static int process_reply(int sock, int type,
return -1;
}
break;
case T_LSTAT:
case T_STATFS:
case T_READLINK:
if (send_response(sock, out_iovec, retval) < 0) {
return -1;
}
break;
default:
return -1;
break;
Expand Down Expand Up @@ -491,6 +666,13 @@ static int process_requests(int sock)
v9fs_string_free(&oldpath);
v9fs_string_free(&path);
break;
case T_LSTAT:
case T_STATFS:
retval = do_stat(header.type, &in_iovec, &out_iovec);
break;
case T_READLINK:
retval = do_readlink(&in_iovec, &out_iovec);
break;
default:
goto err_out;
break;
Expand Down
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