74bc02b2d2
Current code resets file's atime to 0 when there is a change in mtime.
This results in resetting the atime to "1970-01-01 05:30:00". For
example, truncate -s 0 filename results in changing the mtime to the
truncate time, but resets the atime to "1970-01-01 05:30:00". utime
system call does not have any provision to set only mtime or atime. So
change v9fs_wstat_post_chmod function to use utimensat function to change
the atime and mtime fields. If tv_nsec field is set to the special value
"UTIME_OMIT", corresponding file time stamp is not updated.
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
503 lines
12 KiB
C
503 lines
12 KiB
C
/*
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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 <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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static const char *rpath(FsContext *ctx, const char *path)
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{
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/* FIXME: so wrong... */
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static char buffer[4096];
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snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
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return buffer;
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}
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static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
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{
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int err;
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err = lstat(rpath(fs_ctx, path), stbuf);
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if (err) {
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return err;
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}
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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,
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sizeof(uid_t)) > 0) {
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stbuf->st_uid = tmp_uid;
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}
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if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid,
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sizeof(gid_t)) > 0) {
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stbuf->st_gid = tmp_gid;
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}
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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;
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}
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if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev,
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sizeof(dev_t)) > 0) {
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stbuf->st_rdev = tmp_dev;
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}
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}
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return err;
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}
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static int local_set_xattr(const char *path, FsCred *credp)
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{
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int err;
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if (credp->fc_uid != -1) {
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err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t),
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0);
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if (err) {
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return err;
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}
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}
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if (credp->fc_gid != -1) {
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err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t),
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0);
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if (err) {
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return err;
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}
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}
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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);
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if (err) {
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return err;
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}
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}
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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);
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if (err) {
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return err;
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}
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}
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return 0;
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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 (chown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid) < 0) {
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return -1;
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}
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return 0;
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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);
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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);
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close(fd);
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return tsize;
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} else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
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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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}
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static int local_close(FsContext *ctx, int fd)
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{
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return close(fd);
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}
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static int local_closedir(FsContext *ctx, DIR *dir)
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{
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return closedir(dir);
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}
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static int local_open(FsContext *ctx, const char *path, int flags)
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{
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return open(rpath(ctx, path), flags);
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}
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static DIR *local_opendir(FsContext *ctx, const char *path)
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{
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return opendir(rpath(ctx, path));
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}
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static void local_rewinddir(FsContext *ctx, DIR *dir)
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{
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return rewinddir(dir);
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}
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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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}
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static struct dirent *local_readdir(FsContext *ctx, DIR *dir)
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{
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return readdir(dir);
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}
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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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static ssize_t local_readv(FsContext *ctx, int fd, const struct iovec *iov,
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int iovcnt)
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{
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return readv(fd, iov, iovcnt);
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}
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static off_t local_lseek(FsContext *ctx, int fd, off_t offset, int whence)
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{
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return lseek(fd, offset, whence);
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}
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static ssize_t local_writev(FsContext *ctx, int fd, const struct iovec *iov,
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int iovcnt)
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{
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return writev(fd, iov, iovcnt);
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}
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static int local_chmod(FsContext *fs_ctx, const char *path, FsCred *credp)
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{
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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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return chmod(rpath(fs_ctx, path), credp->fc_mode);
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}
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return -1;
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}
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static int local_mknod(FsContext *fs_ctx, const char *path, FsCred *credp)
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{
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int err = -1;
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int serrno = 0;
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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);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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} else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
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err = mknod(rpath(fs_ctx, path), credp->fc_mode, credp->fc_rdev);
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if (err == -1) {
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return err;
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}
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err = local_post_create_passthrough(fs_ctx, path, credp);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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}
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return err;
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err_end:
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remove(rpath(fs_ctx, path));
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errno = serrno;
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return err;
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}
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static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp)
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{
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int err = -1;
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int serrno = 0;
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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);
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if (err == -1) {
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return err;
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}
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credp->fc_mode = credp->fc_mode|S_IFDIR;
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err = local_set_xattr(rpath(fs_ctx, path), credp);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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} else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
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err = mkdir(rpath(fs_ctx, path), credp->fc_mode);
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if (err == -1) {
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return err;
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}
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err = local_post_create_passthrough(fs_ctx, path, credp);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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}
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return err;
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err_end:
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remove(rpath(fs_ctx, path));
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errno = serrno;
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return err;
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}
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static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf)
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{
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int err;
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err = fstat(fd, stbuf);
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if (err) {
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return err;
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}
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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 (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
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stbuf->st_uid = tmp_uid;
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}
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if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
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stbuf->st_gid = tmp_gid;
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}
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if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
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stbuf->st_mode = tmp_mode;
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}
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if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
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stbuf->st_rdev = tmp_dev;
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}
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}
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return err;
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}
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static int local_open2(FsContext *fs_ctx, const char *path, int flags,
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FsCred *credp)
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{
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int fd = -1;
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int err = -1;
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int serrno = 0;
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/* Determine the security model */
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if (fs_ctx->fs_sm == SM_MAPPED) {
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fd = open(rpath(fs_ctx, path), flags, SM_LOCAL_MODE_BITS);
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if (fd == -1) {
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return fd;
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}
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credp->fc_mode = credp->fc_mode|S_IFREG;
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/* Set cleint credentials in xattr */
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err = local_set_xattr(rpath(fs_ctx, path), credp);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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} else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
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fd = open(rpath(fs_ctx, path), flags, credp->fc_mode);
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if (fd == -1) {
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return fd;
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}
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err = local_post_create_passthrough(fs_ctx, path, credp);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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}
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return fd;
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err_end:
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close(fd);
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remove(rpath(fs_ctx, path));
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errno = serrno;
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return err;
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}
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static int local_symlink(FsContext *fs_ctx, const char *oldpath,
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const char *newpath, FsCred *credp)
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{
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int err = -1;
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int serrno = 0;
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/* Determine the security model */
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if (fs_ctx->fs_sm == SM_MAPPED) {
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int fd;
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ssize_t oldpath_size, write_size;
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fd = open(rpath(fs_ctx, newpath), O_CREAT|O_EXCL|O_RDWR,
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SM_LOCAL_MODE_BITS);
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if (fd == -1) {
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return fd;
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}
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/* Write the oldpath (target) to the file. */
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oldpath_size = strlen(oldpath) + 1;
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do {
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write_size = write(fd, (void *)oldpath, oldpath_size);
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} while (write_size == -1 && errno == EINTR);
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if (write_size != oldpath_size) {
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serrno = errno;
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close(fd);
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err = -1;
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goto err_end;
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}
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close(fd);
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/* Set cleint credentials in symlink's xattr */
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credp->fc_mode = credp->fc_mode|S_IFLNK;
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err = local_set_xattr(rpath(fs_ctx, newpath), credp);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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} else if (fs_ctx->fs_sm == SM_PASSTHROUGH) {
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err = symlink(oldpath, rpath(fs_ctx, newpath));
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if (err) {
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return err;
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}
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err = lchown(rpath(fs_ctx, newpath), credp->fc_uid, credp->fc_gid);
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if (err == -1) {
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serrno = errno;
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goto err_end;
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}
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}
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return err;
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err_end:
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remove(rpath(fs_ctx, newpath));
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errno = serrno;
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return err;
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}
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static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
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{
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char *tmp = qemu_strdup(rpath(ctx, oldpath));
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int err, serrno = 0;
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if (tmp == NULL) {
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return -ENOMEM;
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}
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err = link(tmp, rpath(ctx, newpath));
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if (err == -1) {
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serrno = errno;
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}
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qemu_free(tmp);
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if (err == -1) {
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errno = serrno;
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}
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return err;
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}
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static int local_truncate(FsContext *ctx, const char *path, off_t size)
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{
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return truncate(rpath(ctx, path), size);
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}
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static int local_rename(FsContext *ctx, const char *oldpath,
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const char *newpath)
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{
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char *tmp;
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int err;
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tmp = qemu_strdup(rpath(ctx, oldpath));
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err = rename(tmp, rpath(ctx, newpath));
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if (err == -1) {
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int serrno = errno;
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qemu_free(tmp);
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errno = serrno;
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} else {
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qemu_free(tmp);
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}
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return err;
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}
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static int local_chown(FsContext *fs_ctx, const char *path, FsCred *credp)
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{
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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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return lchown(rpath(fs_ctx, path), credp->fc_uid, credp->fc_gid);
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}
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return -1;
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}
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static int local_utimensat(FsContext *s, const char *path,
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const struct timespec *buf)
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{
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return utimensat(AT_FDCWD, rpath(s, path), buf, AT_SYMLINK_NOFOLLOW);
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}
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static int local_remove(FsContext *ctx, const char *path)
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{
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return remove(rpath(ctx, path));
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}
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static int local_fsync(FsContext *ctx, int fd)
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{
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return fsync(fd);
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}
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static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)
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{
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return statfs(rpath(s, path), stbuf);
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}
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FileOperations local_ops = {
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.lstat = local_lstat,
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.readlink = local_readlink,
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.close = local_close,
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.closedir = local_closedir,
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.open = local_open,
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.opendir = local_opendir,
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.rewinddir = local_rewinddir,
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.telldir = local_telldir,
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.readdir = local_readdir,
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.seekdir = local_seekdir,
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.readv = local_readv,
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.lseek = local_lseek,
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.writev = local_writev,
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.chmod = local_chmod,
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.mknod = local_mknod,
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.mkdir = local_mkdir,
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.fstat = local_fstat,
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.open2 = local_open2,
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.symlink = local_symlink,
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.link = local_link,
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.truncate = local_truncate,
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.rename = local_rename,
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.chown = local_chown,
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.utimensat = local_utimensat,
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.remove = local_remove,
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.fsync = local_fsync,
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.statfs = local_statfs,
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};
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