Anand Avati <avati@xxxxxxxxxxx> writes:
> but do not permit setting of O_DIRECT flag via fcntl() (or unsetting)
Again, some more verbose description would be good, as well as a
Signed-off-by.
> ---
> fs/fuse/file.c | 27 +++++++++++++++++++++++----
> 1 files changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 82a6646..f30a7c6 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -154,6 +154,18 @@ int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
> return err;
> }
>
> + if (file->f_flags & O_DIRECT) {
Please use tabs, not spaces.
Before submission you should run your patch through
scripts/checkpatch.pl to filter out such problems.
> + /* set fuse_direct_io_file_operations as fops in
> + fuse_finish_open as though the FS enforced direct_io
> + */
> + outarg.open_flags |= FOPEN_DIRECT_IO;
As I said earlier, I don't like this. Rather the userspace filesystem
should set FOPEN_DIRECT_IO on O_DIRECT if it wants to.
And if the userspace filesystem has not set FOPEN_DIRECT_IO and O_DIRECT
is set then we should return -EINVAL.
Thanks,
Miklos
> +
> + /* make VFS believe we don't support O_DIRECT till we
> + implement a_ops->direct_IO
> + */
> + file->f_flags &= ~O_DIRECT;
> + }
> +
> if (isdir)
> outarg.open_flags &= ~FOPEN_DIRECT_IO;
>
> @@ -193,10 +205,6 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
> struct fuse_conn *fc = get_fuse_conn(inode);
> int err;
>
> - /* VFS checks this, but only _after_ ->open() */
> - if (file->f_flags & O_DIRECT)
> - return -EINVAL;
> -
> err = generic_file_open(inode, file);
> if (err)
> return err;
> @@ -2132,6 +2140,15 @@ int fuse_notify_poll_wakeup(struct fuse_conn *fc,
> return 0;
> }
>
> +
> +static int fuse_check_flags(struct file *filp, int flags)
> +{
> + if ((filp->f_flags ^ flags) & O_DIRECT)
> + return -EINVAL;
> + return 0;
> +}
> +
> +
> static const struct file_operations fuse_file_operations = {
> .llseek = fuse_file_llseek,
> .read = do_sync_read,
> @@ -2149,6 +2166,7 @@ static const struct file_operations fuse_file_operations = {
> .unlocked_ioctl = fuse_file_ioctl,
> .compat_ioctl = fuse_file_compat_ioctl,
> .poll = fuse_file_poll,
> + .check_flags = fuse_check_flags,
> };
>
> static const struct file_operations fuse_direct_io_file_operations = {
> @@ -2165,6 +2183,7 @@ static const struct file_operations fuse_direct_io_file_operations = {
> .unlocked_ioctl = fuse_file_ioctl,
> .compat_ioctl = fuse_file_compat_ioctl,
> .poll = fuse_file_poll,
> + .check_flags = fuse_check_flags,
> /* no splice_read */
> };
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