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vhost_user_fs: Add support for MAX_PAGES

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Add support for MAX_PAGES, corresonding to FUSE_MAX_PAGES introduced
in FUSE 7.28.

This allows us to negotiate with the kernel the maximum number of
pages that we support to transfer in a single request.

Signed-off-by: Sergio Lopez <slp@redhat.com>
This commit is contained in:
Sergio Lopez
2020-04-08 11:23:02 +02:00
committed by Rob Bradford
parent 747f31d82c
commit 926a414b90
2 changed files with 21 additions and 2 deletions
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15
vhost_user_fs/src/fuse.rs
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@@ -137,6 +137,9 @@ const POSIX_ACL: u32 = 1_048_576;
/// Reading the device after abort returns ECONNABORTED.
const ABORT_ERROR: u32 = 2_097_152;
/// Init_out.max_pages contains the max number of req pages.
const MAX_PAGES: u32 = 4_194_304;
bitflags! {
/// A bitfield passed in as a parameter to and returned from the `init` method of the
/// `FileSystem` trait.
@@ -309,6 +312,14 @@ bitflags! {
///
/// This feature is not currently supported.
const ABORT_ERROR = ABORT_ERROR;
/// Indicates support for negotiating the maximum number of pages supported.
///
/// If this feature is enabled, we can tell the kernel the maximum number of pages that we
/// support to transfer in a single request.
///
/// This feature is enabled by default if supported by the kernel.
const MAX_PAGES = MAX_PAGES;
}
}
@@ -848,7 +859,9 @@ pub struct InitOut {
pub congestion_threshold: u16,
pub max_write: u32,
pub time_gran: u32,
pub unused: [u32; 9],
pub max_pages: u16,
pub padding: u16,
pub unused: [u32; 8],
}
unsafe impl ByteValued for InitOut {}