TheCloud/fuse-overlayfs
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Merge pull request #61 from giuseppe/ioctl

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fuse-overlayfs: support some ioctls
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Daniel J Walsh 2019-04-03 17:52:11 -04:00 committed by GitHub
commit 9c7910c441
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1 changed files with 70 additions and 0 deletions
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main.c
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@ -3749,6 +3749,75 @@ ovl_fsync (fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *
fuse_reply_err (req, ret == 0 ? 0 : errno);
}
static void
ovl_ioctl (fuse_req_t req, fuse_ino_t ino, int cmd, void *arg,
struct fuse_file_info *fi, unsigned flags,
const void *in_buf, size_t in_bufsz, size_t out_bufsz)
{
struct ovl_data *lo = ovl_data (req);
cleanup_close int cleaned_fd = -1;
struct ovl_node *node;
int fd = -1;
unsigned long r;
if (flags & FUSE_IOCTL_COMPAT)
{
fuse_reply_err (req, ENOSYS);
return;
}
if (ovl_debug (req))
fprintf (stderr, "ovl_ioctl(ino=%" PRIu64 ", cmd=%d, arg=%p, fi=%p, flags=%d, buf=%p, in_bufsz=%zu, out_bufsz=%zu)\n",
ino, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
node = do_lookup_file (lo, ino, NULL);
if (node == NULL)
{
fuse_reply_err (req, ENOENT);
return;
}
switch (cmd)
{
case FS_IOC_GETVERSION:
case FS_IOC_GETFLAGS:
if (fi->fh >= 0)
fd = fi->fh;
break;
case FS_IOC_SETVERSION:
case FS_IOC_SETFLAGS:
node = get_node_up (lo, node);
if (node == NULL)
{
fuse_reply_err (req, errno);
return;
}
if (in_bufsz >= sizeof (r))
r = *(unsigned long *) in_buf;
break;
default:
fuse_reply_err (req, ENOSYS);
break;
}
if (fd < 0)
{
fd = cleaned_fd = TEMP_FAILURE_RETRY (openat (node_dirfd (node), node->path, O_RDONLY|O_NONBLOCK));
if (fd < 0)
{
fuse_reply_err (req, errno);
return;
}
}
if (ioctl (fd, cmd, &r) < 0)
fuse_reply_err (req, errno);
else
fuse_reply_ioctl (req, 0, &r, out_bufsz ? sizeof (r) : 0);
}
static struct fuse_lowlevel_ops ovl_oper =
{
.statfs = ovl_statfs,
@ -3781,6 +3850,7 @@ static struct fuse_lowlevel_ops ovl_oper =
.link = ovl_link,
.fsync = ovl_fsync,
.flock = ovl_flock,
.ioctl = ovl_ioctl,
};
static int