From: Stefan Hajnoczi <stefanha@redhat.com>
To: "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>
Cc: virtio-fs@redhat.com, qemu-devel@nongnu.org, vgoyal@redhat.com,
groug@kaod.org
Subject: Re: [PATCH v3 18/26] DAX/unmap: virtiofsd: Add VHOST_USER_SLAVE_FS_IO
Date: Thu, 6 May 2021 16:12:07 +0100 [thread overview]
Message-ID: <YJQHRwkUhXT+PLtT@stefanha-x1.localdomain> (raw)
In-Reply-To: <20210428110100.27757-19-dgilbert@redhat.com>
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On Wed, Apr 28, 2021 at 12:00:52PM +0100, Dr. David Alan Gilbert (git) wrote:
> @@ -220,6 +222,99 @@ uint64_t vhost_user_fs_slave_unmap(struct vhost_dev *dev, int message_size,
> return (uint64_t)res;
> }
>
> +uint64_t vhost_user_fs_slave_io(struct vhost_dev *dev, int message_size,
> + VhostUserFSSlaveMsg *sm, int fd)
> +{
> + VHostUserFS *fs = (VHostUserFS *)object_dynamic_cast(OBJECT(dev->vdev),
> + TYPE_VHOST_USER_FS);
> + if (!fs) {
> + error_report("%s: Bad fs ptr", __func__);
> + return (uint64_t)-1;
> + }
> + if (!check_slave_message_entries(sm, message_size)) {
> + return (uint64_t)-1;
> + }
These early error returns don't close(fd).
> +
> + unsigned int i;
> + int res = 0;
> + size_t done = 0;
> +
> + if (fd < 0) {
> + error_report("Bad fd for io");
> + return (uint64_t)-1;
> + }
> +
> + for (i = 0; i < sm->count && !res; i++) {
> + VhostUserFSSlaveMsgEntry *e = &sm->entries[i];
> + if (e->len == 0) {
> + continue;
> + }
> +
> + size_t len = e->len;
> + uint64_t fd_offset = e->fd_offset;
> + hwaddr gpa = e->c_offset;
> +
> + while (len && !res) {
> + hwaddr xlat, xlat_len;
> + bool is_write = e->flags & VHOST_USER_FS_FLAG_MAP_W;
> + MemoryRegion *mr = address_space_translate(dev->vdev->dma_as, gpa,
> + &xlat, &xlat_len,
> + is_write,
> + MEMTXATTRS_UNSPECIFIED);
> + if (!mr || !xlat_len) {
> + error_report("No guest region found for 0x%" HWADDR_PRIx, gpa);
> + res = -EFAULT;
> + break;
> + }
> +
> + trace_vhost_user_fs_slave_io_loop(mr->name,
> + (uint64_t)xlat,
> + memory_region_is_ram(mr),
> + memory_region_is_romd(mr),
> + (size_t)xlat_len);
> +
> + void *hostptr = qemu_map_ram_ptr(mr->ram_block,
> + xlat);
> + ssize_t transferred;
What happens when the MemoryRegion is not backed by RAM?
> + if (e->flags & VHOST_USER_FS_FLAG_MAP_R) {
> + /* Read from file into RAM */
> + if (mr->readonly) {
> + res = -EFAULT;
> + break;
> + }
> + transferred = pread(fd, hostptr, xlat_len, fd_offset);
> + } else if (e->flags & VHOST_USER_FS_FLAG_MAP_W) {
> + /* Write into file from RAM */
> + transferred = pwrite(fd, hostptr, xlat_len, fd_offset);
> + } else {
> + transferred = EINVAL;
I don't see how this is handled below by the error checking code. Should
this be:
errno = EINVAL;
transferred = -1;
?
> + }
> +
> + trace_vhost_user_fs_slave_io_loop_res(transferred);
> + if (transferred < 0) {
> + res = -errno;
> + break;
> + }
> + if (!transferred) {
> + /* EOF */
> + break;
> + }
> +
> + done += transferred;
> + fd_offset += transferred;
> + gpa += transferred;
> + len -= transferred;
> + }
> + }
> + close(fd);
> +
> + trace_vhost_user_fs_slave_io_exit(res, done);
> + if (res < 0) {
> + return (uint64_t)res;
> + }
> + return (uint64_t)done;
> +}
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next prev parent reply other threads:[~2021-05-06 15:13 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-28 11:00 [PATCH v3 00/26] virtiofs dax patches Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 01/26] virtiofs: Fixup printf args Dr. David Alan Gilbert (git)
2021-05-04 14:54 ` Stefan Hajnoczi
2021-05-05 11:06 ` Dr. David Alan Gilbert
2021-05-06 15:56 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 02/26] virtiofsd: Don't assume header layout Dr. David Alan Gilbert (git)
2021-05-04 15:12 ` Stefan Hajnoczi
2021-05-06 15:56 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 03/26] DAX: vhost-user: Rework slave return values Dr. David Alan Gilbert (git)
2021-05-04 15:23 ` Stefan Hajnoczi
2021-05-27 15:59 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 04/26] DAX: libvhost-user: Route slave message payload Dr. David Alan Gilbert (git)
2021-05-04 15:26 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 05/26] DAX: libvhost-user: Allow popping a queue element with bad pointers Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 06/26] DAX subprojects/libvhost-user: Add virtio-fs slave types Dr. David Alan Gilbert (git)
2021-04-29 15:48 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 07/26] DAX: virtio: Add shared memory capability Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 08/26] DAX: virtio-fs: Add cache BAR Dr. David Alan Gilbert (git)
2021-05-05 12:12 ` Stefan Hajnoczi
2021-05-05 18:59 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 09/26] DAX: virtio-fs: Add vhost-user slave commands for mapping Dr. David Alan Gilbert (git)
2021-05-05 14:15 ` Stefan Hajnoczi
2021-05-27 16:57 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 10/26] DAX: virtio-fs: Fill in " Dr. David Alan Gilbert (git)
2021-05-05 16:43 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 11/26] DAX: virtiofsd Add cache accessor functions Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 12/26] DAX: virtiofsd: Add setup/remove mappings fuse commands Dr. David Alan Gilbert (git)
2021-05-06 15:02 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 13/26] DAX: virtiofsd: Add setup/remove mapping handlers to passthrough_ll Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 14/26] DAX: virtiofsd: Wire up passthrough_ll's lo_setupmapping Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 15/26] DAX: virtiofsd: Make lo_removemapping() work Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 16/26] DAX: virtiofsd: route se down to destroy method Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 17/26] DAX: virtiofsd: Perform an unmap on destroy Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 18/26] DAX/unmap: virtiofsd: Add VHOST_USER_SLAVE_FS_IO Dr. David Alan Gilbert (git)
2021-05-06 15:12 ` Stefan Hajnoczi [this message]
2021-05-27 17:44 ` Dr. David Alan Gilbert
2021-05-06 15:16 ` Stefan Hajnoczi
2021-05-27 17:31 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 19/26] DAX/unmap virtiofsd: Add wrappers for VHOST_USER_SLAVE_FS_IO Dr. David Alan Gilbert (git)
2021-04-28 12:53 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 20/26] DAX/unmap virtiofsd: Parse unmappable elements Dr. David Alan Gilbert (git)
2021-05-06 15:23 ` Stefan Hajnoczi
2021-05-27 17:56 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 21/26] DAX/unmap virtiofsd: Route unmappable reads Dr. David Alan Gilbert (git)
2021-05-06 15:27 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 22/26] DAX/unmap virtiofsd: route unmappable write to slave command Dr. David Alan Gilbert (git)
2021-05-06 15:28 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 23/26] DAX:virtiofsd: implement FUSE_INIT map_alignment field Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 24/26] vhost-user-fs: Extend VhostUserFSSlaveMsg to pass additional info Dr. David Alan Gilbert (git)
2021-05-06 15:31 ` Stefan Hajnoczi
2021-05-06 15:32 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 25/26] vhost-user-fs: Implement drop CAP_FSETID functionality Dr. David Alan Gilbert (git)
2021-04-28 11:01 ` [PATCH v3 26/26] virtiofsd: Ask qemu to drop CAP_FSETID if client asked for it Dr. David Alan Gilbert (git)
2021-05-06 15:37 ` Stefan Hajnoczi
2021-05-06 16:02 ` Vivek Goyal
2021-05-10 9:05 ` Stefan Hajnoczi
2021-05-10 15:23 ` Vivek Goyal
2021-05-10 15:32 ` Stefan Hajnoczi
2021-05-27 19:09 ` Dr. David Alan Gilbert
2021-06-10 15:29 ` Dr. David Alan Gilbert
2021-06-10 16:23 ` Stefan Hajnoczi
2021-06-16 12:36 ` Dr. David Alan Gilbert
2021-06-16 15:29 ` Stefan Hajnoczi
2021-06-16 18:35 ` Dr. David Alan Gilbert
2021-04-28 11:27 ` [PATCH v3 00/26] virtiofs dax patches no-reply
2021-05-06 15:37 ` Stefan Hajnoczi
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