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hw/9pfs: Create other filesystem objects

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Add interfaces to create filesystem objects like directory,
device nodes, symbolic links, links for proxy filesytem driver

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
M. Mohan Kumar 2011-12-14 13:58:45 +05:30 • committed by Aneesh Kumar K.V
parent daf0b9aca9
commit 39f8c32c3f
3 changed files with 313 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

129
fsdev/virtfs-proxy-helper.c
View file

@ -231,6 +231,30 @@ static int send_fd(int sockfd, int fd)
return 0;
}
static int send_status(int sockfd, struct iovec *iovec, int status)
{
ProxyHeader header;
int retval, msg_size;;
if (status < 0) {
header.type = T_ERROR;
} else {
header.type = T_SUCCESS;
}
header.size = sizeof(status);
/*
* marshal the return status. We don't check error.
* because we are sure we have enough space for the status
*/
msg_size = proxy_marshal(iovec, 0, "ddd", header.type,
header.size, status);
retval = socket_write(sockfd, iovec->iov_base, msg_size);
if (retval < 0) {
return retval;
}
return 0;
}
/*
* from man 7 capabilities, section
* Effect of User ID Changes on Capabilities:
@ -261,6 +285,67 @@ static int setfsugid(int uid, int gid)
return 0;
}
/*
* create other filesystem objects and send 0 on success
* return -errno on error
*/
static int do_create_others(int type, struct iovec *iovec)
{
dev_t rdev;
int retval = 0;
int offset = PROXY_HDR_SZ;
V9fsString oldpath, path;
int mode, uid, gid, cur_uid, cur_gid;
v9fs_string_init(&path);
v9fs_string_init(&oldpath);
cur_uid = geteuid();
cur_gid = getegid();
retval = proxy_unmarshal(iovec, offset, "dd", &uid, &gid);
if (retval < 0) {
return retval;
}
offset += retval;
retval = setfsugid(uid, gid);
if (retval < 0) {
retval = -errno;
goto err_out;
}
switch (type) {
case T_MKNOD:
retval = proxy_unmarshal(iovec, offset, "sdq", &path, &mode, &rdev);
if (retval < 0) {
goto err_out;
}
retval = mknod(path.data, mode, rdev);
break;
case T_MKDIR:
retval = proxy_unmarshal(iovec, offset, "sd", &path, &mode);
if (retval < 0) {
goto err_out;
}
retval = mkdir(path.data, mode);
break;
case T_SYMLINK:
retval = proxy_unmarshal(iovec, offset, "ss", &oldpath, &path);
if (retval < 0) {
goto err_out;
}
retval = symlink(oldpath.data, path.data);
break;
}
if (retval < 0) {
retval = -errno;
}
err_out:
v9fs_string_free(&path);
v9fs_string_free(&oldpath);
setfsugid(cur_uid, cur_gid);
return retval;
}
/*
* create a file and send fd on success
* return -errno on error
@ -332,7 +417,8 @@ static void usage(char *prog)
basename(prog));
}
static int process_reply(int sock, int type, int retval)
static int process_reply(int sock, int type,
struct iovec *out_iovec, int retval)
{
switch (type) {
case T_OPEN:
@ -341,6 +427,14 @@ static int process_reply(int sock, int type, int retval)
return -1;
}
break;
case T_MKNOD:
case T_MKDIR:
case T_SYMLINK:
case T_LINK:
if (send_status(sock, out_iovec, retval) < 0) {
return -1;
}
break;
default:
return -1;
break;
@ -352,10 +446,14 @@ static int process_requests(int sock)
{
int retval = 0;
ProxyHeader header;
struct iovec in_iovec;
V9fsString oldpath, path;
struct iovec in_iovec, out_iovec;
in_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
in_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
out_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
out_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
in_iovec.iov_base = g_malloc(PROXY_MAX_IO_SZ + PROXY_HDR_SZ);
in_iovec.iov_len = PROXY_MAX_IO_SZ + PROXY_HDR_SZ;
while (1) {
/*
* initialize the header type, so that we send
@ -374,18 +472,37 @@ static int process_requests(int sock)
case T_CREATE:
retval = do_create(&in_iovec);
break;
case T_MKNOD:
case T_MKDIR:
case T_SYMLINK:
retval = do_create_others(header.type, &in_iovec);
break;
case T_LINK:
v9fs_string_init(&path);
v9fs_string_init(&oldpath);
retval = proxy_unmarshal(&in_iovec, PROXY_HDR_SZ,
"ss", &oldpath, &path);
if (retval > 0) {
retval = link(oldpath.data, path.data);
if (retval < 0) {
retval = -errno;
}
}
v9fs_string_free(&oldpath);
v9fs_string_free(&path);
break;
default:
goto err_out;
break;
}
if (process_reply(sock, header.type, retval) < 0) {
if (process_reply(sock, header.type, &out_iovec, retval) < 0) {
goto err_out;
}
}
(void)socket_write;
err_out:
g_free(in_iovec.iov_base);
g_free(out_iovec.iov_base);
return -1;
}