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authorM. Mohan Kumar <mohan@in.ibm.com>2011-12-14 13:58:45 +0530
committerAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2012-01-04 20:19:39 +0530
commitb178adc3e78fa1ad274f8d78e43443c39f862143 (patch)
treed4b1ab858104e8372863ce7a9f5caf0aba668ead /fsdev
parent39f8c32c3f4ed54d5d5dfb7cc0f2eb3b244e511a (diff)
hw/9pfs: Add stat/readlink/statfs for proxy FS
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'fsdev')
-rw-r--r--fsdev/virtfs-proxy-helper.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
index 83fbae7f5..9b3c83305 100644
--- a/fsdev/virtfs-proxy-helper.c
+++ b/fsdev/virtfs-proxy-helper.c
@@ -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"
@@ -286,6 +288,172 @@ static int setfsugid(int uid, int gid)
}
/*
+ * 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
*/
@@ -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;
@@ -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;