root / hw / virtio-9p-local.c @ 56d15a53
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| 1 |
/*
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|---|---|
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* Virtio 9p Posix callback
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
|
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* Anthony Liguori <aliguori@us.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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*/
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#include "virtio.h" |
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#include "virtio-9p.h" |
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#include "virtio-9p-xattr.h" |
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#include <arpa/inet.h> |
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#include <pwd.h> |
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#include <grp.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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#include <attr/xattr.h> |
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|
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|
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static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf) |
| 25 |
{
|
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int err;
|
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err = lstat(rpath(fs_ctx, path), stbuf); |
| 28 |
if (err) {
|
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return err;
|
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} |
| 31 |
if (fs_ctx->fs_sm == SM_MAPPED) {
|
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/* Actual credentials are part of extended attrs */
|
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uid_t tmp_uid; |
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gid_t tmp_gid; |
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mode_t tmp_mode; |
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dev_t tmp_dev; |
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if (getxattr(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid, |
| 38 |
sizeof(uid_t)) > 0) { |
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stbuf->st_uid = tmp_uid; |
| 40 |
} |
| 41 |
if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid, |
| 42 |
sizeof(gid_t)) > 0) { |
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stbuf->st_gid = tmp_gid; |
| 44 |
} |
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if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode, |
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sizeof(mode_t)) > 0) { |
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stbuf->st_mode = tmp_mode; |
| 48 |
} |
| 49 |
if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev, |
| 50 |
sizeof(dev_t)) > 0) { |
| 51 |
stbuf->st_rdev = tmp_dev; |
| 52 |
} |
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} |
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return err;
|
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} |
| 56 |
|
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static int local_set_xattr(const char *path, FsCred *credp) |
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{
|
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int err;
|
| 60 |
if (credp->fc_uid != -1) { |
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err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t), |
| 62 |
0);
|
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if (err) {
|
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return err;
|
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} |
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} |
| 67 |
if (credp->fc_gid != -1) { |
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err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t), |
| 69 |
0);
|
| 70 |
if (err) {
|
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return err;
|
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} |
| 73 |
} |
| 74 |
if (credp->fc_mode != -1) { |
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err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
|
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sizeof(mode_t), 0); |
| 77 |
if (err) {
|
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return err;
|
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} |
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} |
| 81 |
if (credp->fc_rdev != -1) { |
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err = setxattr(path, "user.virtfs.rdev", &credp->fc_rdev,
|
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sizeof(dev_t), 0); |
| 84 |
if (err) {
|
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return err;
|
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} |
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} |
| 88 |
return 0; |
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} |
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|
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static int local_post_create_passthrough(FsContext *fs_ctx, const char *path, |
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FsCred *credp) |
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{
|
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if (chmod(rpath(fs_ctx, path), credp->fc_mode & 07777) < 0) { |
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return -1; |
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} |
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if (lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid) < 0) { |
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/*
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* If we fail to change ownership and if we are
|
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* using security model none. Ignore the error
|
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*/
|
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if (fs_ctx->fs_sm != SM_NONE) {
|
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return -1; |
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} |
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} |
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return 0; |
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} |
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|
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static ssize_t local_readlink(FsContext *fs_ctx, const char *path, |
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char *buf, size_t bufsz)
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{
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ssize_t tsize = -1;
|
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if (fs_ctx->fs_sm == SM_MAPPED) {
|
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int fd;
|
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fd = open(rpath(fs_ctx, path), O_RDONLY); |
| 116 |
if (fd == -1) { |
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return -1; |
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} |
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do {
|
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tsize = read(fd, (void *)buf, bufsz);
|
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} while (tsize == -1 && errno == EINTR); |
| 122 |
close(fd); |
| 123 |
return tsize;
|
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} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
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(fs_ctx->fs_sm == SM_NONE)) {
|
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tsize = readlink(rpath(fs_ctx, path), buf, bufsz); |
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} |
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return tsize;
|
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} |
| 130 |
|
| 131 |
static int local_close(FsContext *ctx, int fd) |
| 132 |
{
|
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return close(fd);
|
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} |
| 135 |
|
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static int local_closedir(FsContext *ctx, DIR *dir) |
| 137 |
{
|
| 138 |
return closedir(dir);
|
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} |
| 140 |
|
| 141 |
static int local_open(FsContext *ctx, const char *path, int flags) |
| 142 |
{
|
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return open(rpath(ctx, path), flags);
|
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} |
| 145 |
|
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static DIR *local_opendir(FsContext *ctx, const char *path) |
| 147 |
{
|
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return opendir(rpath(ctx, path));
|
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} |
| 150 |
|
| 151 |
static void local_rewinddir(FsContext *ctx, DIR *dir) |
| 152 |
{
|
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return rewinddir(dir);
|
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} |
| 155 |
|
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static off_t local_telldir(FsContext *ctx, DIR *dir)
|
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{
|
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return telldir(dir);
|
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} |
| 160 |
|
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static struct dirent *local_readdir(FsContext *ctx, DIR *dir) |
| 162 |
{
|
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return readdir(dir);
|
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} |
| 165 |
|
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static void local_seekdir(FsContext *ctx, DIR *dir, off_t off) |
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{
|
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return seekdir(dir, off);
|
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} |
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|
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static ssize_t local_preadv(FsContext *ctx, int fd, const struct iovec *iov, |
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int iovcnt, off_t offset)
|
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{
|
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#ifdef CONFIG_PREADV
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return preadv(fd, iov, iovcnt, offset);
|
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#else
|
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int err = lseek(fd, offset, SEEK_SET);
|
| 178 |
if (err == -1) { |
| 179 |
return err;
|
| 180 |
} else {
|
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return readv(fd, iov, iovcnt);
|
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} |
| 183 |
#endif
|
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} |
| 185 |
|
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static ssize_t local_pwritev(FsContext *ctx, int fd, const struct iovec *iov, |
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int iovcnt, off_t offset)
|
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{
|
| 189 |
#ifdef CONFIG_PREADV
|
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return pwritev(fd, iov, iovcnt, offset);
|
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#else
|
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int err = lseek(fd, offset, SEEK_SET);
|
| 193 |
if (err == -1) { |
| 194 |
return err;
|
| 195 |
} else {
|
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return writev(fd, iov, iovcnt);
|
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} |
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#endif
|
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} |
| 200 |
|
| 201 |
static int local_chmod(FsContext *fs_ctx, const char *path, FsCred *credp) |
| 202 |
{
|
| 203 |
if (fs_ctx->fs_sm == SM_MAPPED) {
|
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return local_set_xattr(rpath(fs_ctx, path), credp);
|
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} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
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(fs_ctx->fs_sm == SM_NONE)) {
|
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return chmod(rpath(fs_ctx, path), credp->fc_mode);
|
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} |
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return -1; |
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} |
| 211 |
|
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static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp) |
| 213 |
{
|
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int err = -1; |
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int serrno = 0; |
| 216 |
|
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/* Determine the security model */
|
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if (fs_ctx->fs_sm == SM_MAPPED) {
|
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err = mknod(rpath(fs_ctx, path), SM_LOCAL_MODE_BITS|S_IFREG, 0);
|
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if (err == -1) { |
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return err;
|
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} |
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local_set_xattr(rpath(fs_ctx, path), credp); |
| 224 |
if (err == -1) { |
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serrno = errno; |
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goto err_end;
|
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} |
| 228 |
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
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(fs_ctx->fs_sm == SM_NONE)) {
|
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err = mknod(rpath(fs_ctx, path), credp->fc_mode, credp->fc_rdev); |
| 231 |
if (err == -1) { |
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return err;
|
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} |
| 234 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 235 |
if (err == -1) { |
| 236 |
serrno = errno; |
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goto err_end;
|
| 238 |
} |
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} |
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return err;
|
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|
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err_end:
|
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remove(rpath(fs_ctx, path)); |
| 244 |
errno = serrno; |
| 245 |
return err;
|
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} |
| 247 |
|
| 248 |
static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp) |
| 249 |
{
|
| 250 |
int err = -1; |
| 251 |
int serrno = 0; |
| 252 |
|
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/* Determine the security model */
|
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if (fs_ctx->fs_sm == SM_MAPPED) {
|
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err = mkdir(rpath(fs_ctx, path), SM_LOCAL_DIR_MODE_BITS); |
| 256 |
if (err == -1) { |
| 257 |
return err;
|
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} |
| 259 |
credp->fc_mode = credp->fc_mode|S_IFDIR; |
| 260 |
err = local_set_xattr(rpath(fs_ctx, path), credp); |
| 261 |
if (err == -1) { |
| 262 |
serrno = errno; |
| 263 |
goto err_end;
|
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} |
| 265 |
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
| 266 |
(fs_ctx->fs_sm == SM_NONE)) {
|
| 267 |
err = mkdir(rpath(fs_ctx, path), credp->fc_mode); |
| 268 |
if (err == -1) { |
| 269 |
return err;
|
| 270 |
} |
| 271 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 272 |
if (err == -1) { |
| 273 |
serrno = errno; |
| 274 |
goto err_end;
|
| 275 |
} |
| 276 |
} |
| 277 |
return err;
|
| 278 |
|
| 279 |
err_end:
|
| 280 |
remove(rpath(fs_ctx, path)); |
| 281 |
errno = serrno; |
| 282 |
return err;
|
| 283 |
} |
| 284 |
|
| 285 |
static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf) |
| 286 |
{
|
| 287 |
int err;
|
| 288 |
err = fstat(fd, stbuf); |
| 289 |
if (err) {
|
| 290 |
return err;
|
| 291 |
} |
| 292 |
if (fs_ctx->fs_sm == SM_MAPPED) {
|
| 293 |
/* Actual credentials are part of extended attrs */
|
| 294 |
uid_t tmp_uid; |
| 295 |
gid_t tmp_gid; |
| 296 |
mode_t tmp_mode; |
| 297 |
dev_t tmp_dev; |
| 298 |
|
| 299 |
if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { |
| 300 |
stbuf->st_uid = tmp_uid; |
| 301 |
} |
| 302 |
if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { |
| 303 |
stbuf->st_gid = tmp_gid; |
| 304 |
} |
| 305 |
if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) { |
| 306 |
stbuf->st_mode = tmp_mode; |
| 307 |
} |
| 308 |
if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) { |
| 309 |
stbuf->st_rdev = tmp_dev; |
| 310 |
} |
| 311 |
} |
| 312 |
return err;
|
| 313 |
} |
| 314 |
|
| 315 |
static int local_open2(FsContext *fs_ctx, const char *path, int flags, |
| 316 |
FsCred *credp) |
| 317 |
{
|
| 318 |
int fd = -1; |
| 319 |
int err = -1; |
| 320 |
int serrno = 0; |
| 321 |
|
| 322 |
/* Determine the security model */
|
| 323 |
if (fs_ctx->fs_sm == SM_MAPPED) {
|
| 324 |
fd = open(rpath(fs_ctx, path), flags, SM_LOCAL_MODE_BITS); |
| 325 |
if (fd == -1) { |
| 326 |
return fd;
|
| 327 |
} |
| 328 |
credp->fc_mode = credp->fc_mode|S_IFREG; |
| 329 |
/* Set cleint credentials in xattr */
|
| 330 |
err = local_set_xattr(rpath(fs_ctx, path), credp); |
| 331 |
if (err == -1) { |
| 332 |
serrno = errno; |
| 333 |
goto err_end;
|
| 334 |
} |
| 335 |
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
| 336 |
(fs_ctx->fs_sm == SM_NONE)) {
|
| 337 |
fd = open(rpath(fs_ctx, path), flags, credp->fc_mode); |
| 338 |
if (fd == -1) { |
| 339 |
return fd;
|
| 340 |
} |
| 341 |
err = local_post_create_passthrough(fs_ctx, path, credp); |
| 342 |
if (err == -1) { |
| 343 |
serrno = errno; |
| 344 |
goto err_end;
|
| 345 |
} |
| 346 |
} |
| 347 |
return fd;
|
| 348 |
|
| 349 |
err_end:
|
| 350 |
close(fd); |
| 351 |
remove(rpath(fs_ctx, path)); |
| 352 |
errno = serrno; |
| 353 |
return err;
|
| 354 |
} |
| 355 |
|
| 356 |
|
| 357 |
static int local_symlink(FsContext *fs_ctx, const char *oldpath, |
| 358 |
const char *newpath, FsCred *credp) |
| 359 |
{
|
| 360 |
int err = -1; |
| 361 |
int serrno = 0; |
| 362 |
|
| 363 |
/* Determine the security model */
|
| 364 |
if (fs_ctx->fs_sm == SM_MAPPED) {
|
| 365 |
int fd;
|
| 366 |
ssize_t oldpath_size, write_size; |
| 367 |
fd = open(rpath(fs_ctx, newpath), O_CREAT|O_EXCL|O_RDWR, |
| 368 |
SM_LOCAL_MODE_BITS); |
| 369 |
if (fd == -1) { |
| 370 |
return fd;
|
| 371 |
} |
| 372 |
/* Write the oldpath (target) to the file. */
|
| 373 |
oldpath_size = strlen(oldpath) + 1;
|
| 374 |
do {
|
| 375 |
write_size = write(fd, (void *)oldpath, oldpath_size);
|
| 376 |
} while (write_size == -1 && errno == EINTR); |
| 377 |
|
| 378 |
if (write_size != oldpath_size) {
|
| 379 |
serrno = errno; |
| 380 |
close(fd); |
| 381 |
err = -1;
|
| 382 |
goto err_end;
|
| 383 |
} |
| 384 |
close(fd); |
| 385 |
/* Set cleint credentials in symlink's xattr */
|
| 386 |
credp->fc_mode = credp->fc_mode|S_IFLNK; |
| 387 |
err = local_set_xattr(rpath(fs_ctx, newpath), credp); |
| 388 |
if (err == -1) { |
| 389 |
serrno = errno; |
| 390 |
goto err_end;
|
| 391 |
} |
| 392 |
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
| 393 |
(fs_ctx->fs_sm == SM_NONE)) {
|
| 394 |
err = symlink(oldpath, rpath(fs_ctx, newpath)); |
| 395 |
if (err) {
|
| 396 |
return err;
|
| 397 |
} |
| 398 |
err = lchown(rpath(fs_ctx, newpath), credp->fc_uid, credp->fc_gid); |
| 399 |
if (err == -1) { |
| 400 |
/*
|
| 401 |
* If we fail to change ownership and if we are
|
| 402 |
* using security model none. Ignore the error
|
| 403 |
*/
|
| 404 |
if (fs_ctx->fs_sm != SM_NONE) {
|
| 405 |
serrno = errno; |
| 406 |
goto err_end;
|
| 407 |
} else
|
| 408 |
err = 0;
|
| 409 |
} |
| 410 |
} |
| 411 |
return err;
|
| 412 |
|
| 413 |
err_end:
|
| 414 |
remove(rpath(fs_ctx, newpath)); |
| 415 |
errno = serrno; |
| 416 |
return err;
|
| 417 |
} |
| 418 |
|
| 419 |
static int local_link(FsContext *ctx, const char *oldpath, const char *newpath) |
| 420 |
{
|
| 421 |
char *tmp = qemu_strdup(rpath(ctx, oldpath));
|
| 422 |
int err, serrno = 0; |
| 423 |
|
| 424 |
if (tmp == NULL) { |
| 425 |
return -ENOMEM;
|
| 426 |
} |
| 427 |
|
| 428 |
err = link(tmp, rpath(ctx, newpath)); |
| 429 |
if (err == -1) { |
| 430 |
serrno = errno; |
| 431 |
} |
| 432 |
|
| 433 |
qemu_free(tmp); |
| 434 |
|
| 435 |
if (err == -1) { |
| 436 |
errno = serrno; |
| 437 |
} |
| 438 |
|
| 439 |
return err;
|
| 440 |
} |
| 441 |
|
| 442 |
static int local_truncate(FsContext *ctx, const char *path, off_t size) |
| 443 |
{
|
| 444 |
return truncate(rpath(ctx, path), size);
|
| 445 |
} |
| 446 |
|
| 447 |
static int local_rename(FsContext *ctx, const char *oldpath, |
| 448 |
const char *newpath) |
| 449 |
{
|
| 450 |
char *tmp;
|
| 451 |
int err;
|
| 452 |
|
| 453 |
tmp = qemu_strdup(rpath(ctx, oldpath)); |
| 454 |
|
| 455 |
err = rename(tmp, rpath(ctx, newpath)); |
| 456 |
if (err == -1) { |
| 457 |
int serrno = errno;
|
| 458 |
qemu_free(tmp); |
| 459 |
errno = serrno; |
| 460 |
} else {
|
| 461 |
qemu_free(tmp); |
| 462 |
} |
| 463 |
|
| 464 |
return err;
|
| 465 |
|
| 466 |
} |
| 467 |
|
| 468 |
static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp) |
| 469 |
{
|
| 470 |
if ((credp->fc_uid == -1 && credp->fc_gid == -1) || |
| 471 |
(fs_ctx->fs_sm == SM_PASSTHROUGH)) {
|
| 472 |
return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
|
| 473 |
} else if (fs_ctx->fs_sm == SM_MAPPED) { |
| 474 |
return local_set_xattr(rpath(fs_ctx, path), credp);
|
| 475 |
} else if ((fs_ctx->fs_sm == SM_PASSTHROUGH) || |
| 476 |
(fs_ctx->fs_sm == SM_NONE)) {
|
| 477 |
return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
|
| 478 |
} |
| 479 |
return -1; |
| 480 |
} |
| 481 |
|
| 482 |
static int local_utimensat(FsContext *s, const char *path, |
| 483 |
const struct timespec *buf) |
| 484 |
{
|
| 485 |
return utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
|
| 486 |
} |
| 487 |
|
| 488 |
static int local_remove(FsContext *ctx, const char *path) |
| 489 |
{
|
| 490 |
return remove(rpath(ctx, path));
|
| 491 |
} |
| 492 |
|
| 493 |
static int local_fsync(FsContext *ctx, int fd) |
| 494 |
{
|
| 495 |
return fsync(fd);
|
| 496 |
} |
| 497 |
|
| 498 |
static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf) |
| 499 |
{
|
| 500 |
return statfs(rpath(s, path), stbuf);
|
| 501 |
} |
| 502 |
|
| 503 |
static ssize_t local_lgetxattr(FsContext *ctx, const char *path, |
| 504 |
const char *name, void *value, size_t size) |
| 505 |
{
|
| 506 |
return v9fs_get_xattr(ctx, path, name, value, size);
|
| 507 |
} |
| 508 |
|
| 509 |
static ssize_t local_llistxattr(FsContext *ctx, const char *path, |
| 510 |
void *value, size_t size)
|
| 511 |
{
|
| 512 |
return v9fs_list_xattr(ctx, path, value, size);
|
| 513 |
} |
| 514 |
|
| 515 |
static int local_lsetxattr(FsContext *ctx, const char *path, const char *name, |
| 516 |
void *value, size_t size, int flags) |
| 517 |
{
|
| 518 |
return v9fs_set_xattr(ctx, path, name, value, size, flags);
|
| 519 |
} |
| 520 |
|
| 521 |
static int local_lremovexattr(FsContext *ctx, |
| 522 |
const char *path, const char *name) |
| 523 |
{
|
| 524 |
return v9fs_remove_xattr(ctx, path, name);
|
| 525 |
} |
| 526 |
|
| 527 |
|
| 528 |
FileOperations local_ops = {
|
| 529 |
.lstat = local_lstat, |
| 530 |
.readlink = local_readlink, |
| 531 |
.close = local_close, |
| 532 |
.closedir = local_closedir, |
| 533 |
.open = local_open, |
| 534 |
.opendir = local_opendir, |
| 535 |
.rewinddir = local_rewinddir, |
| 536 |
.telldir = local_telldir, |
| 537 |
.readdir = local_readdir, |
| 538 |
.seekdir = local_seekdir, |
| 539 |
.preadv = local_preadv, |
| 540 |
.pwritev = local_pwritev, |
| 541 |
.chmod = local_chmod, |
| 542 |
.mknod = local_mknod, |
| 543 |
.mkdir = local_mkdir, |
| 544 |
.fstat = local_fstat, |
| 545 |
.open2 = local_open2, |
| 546 |
.symlink = local_symlink, |
| 547 |
.link = local_link, |
| 548 |
.truncate = local_truncate, |
| 549 |
.rename = local_rename, |
| 550 |
.chown = local_chown, |
| 551 |
.utimensat = local_utimensat, |
| 552 |
.remove = local_remove, |
| 553 |
.fsync = local_fsync, |
| 554 |
.statfs = local_statfs, |
| 555 |
.lgetxattr = local_lgetxattr, |
| 556 |
.llistxattr = local_llistxattr, |
| 557 |
.lsetxattr = local_lsetxattr, |
| 558 |
.lremovexattr = local_lremovexattr, |
| 559 |
}; |