OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_WRITE
Add the VirtioFsFuseWrite() function, for sending the FUSE_WRITE command to the Virtio Filesystem device. (For avoiding oversized FUSE_WRITE commands, save the maximum write buffer size that is advertized by the FUSE server, in the session init code.) Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20201216211125.19496-39-lersek@redhat.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
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@@ -22,7 +22,10 @@
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@param[in,out] VirtioFs The Virtio Filesystem device to send the FUSE_INIT
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request to. The FUSE request counter
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"VirtioFs->RequestId" is set to 1 on output.
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"VirtioFs->RequestId" is set to 1 on output. The
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maximum write buffer size exposed in the FUSE_INIT
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response is saved in "VirtioFs->MaxWrite", on
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output.
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@retval EFI_SUCCESS The FUSE session has been started.
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@@ -126,9 +129,14 @@ VirtioFsFuseInitSession (
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//
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if (InitResp.Major < InitReq.Major ||
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(InitResp.Major == InitReq.Major && InitResp.Minor < InitReq.Minor) ||
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(InitResp.Flags & VIRTIO_FS_FUSE_INIT_REQ_F_DO_READDIRPLUS) == 0) {
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(InitResp.Flags & VIRTIO_FS_FUSE_INIT_REQ_F_DO_READDIRPLUS) == 0 ||
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InitResp.MaxWrite < SIZE_4KB) {
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return EFI_UNSUPPORTED;
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}
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//
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// Save the maximum write buffer size for FUSE_WRITE requests.
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//
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VirtioFs->MaxWrite = InitResp.MaxWrite;
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return EFI_SUCCESS;
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}
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