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vhost_user_fs: Add the EXPLICIT_INVAL_DATA capability flag

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Add EXPLICIT_INVAL_DATA capability flag, corresponding to
FUSE_EXPLICIT_INVAL_DATA introduced in FUSE 7.30.

Signed-off-by: Sergio Lopez <slp@redhat.com>
This commit is contained in:
Sergio Lopez 2020-04-08 12:14:29 +02:00 committed by Rob Bradford
parent 621ea837fa
commit 592cfbafb3
1 changed files with 11 additions and 0 deletions
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11
vhost_user_fs/src/fuse.rs
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@ -146,6 +146,9 @@ const CACHE_SYMLINKS: u32 = 8_388_608;
/// Kernel supports zero-message opendir
const NO_OPENDIR_SUPPORT: u32 = 16_777_216;
/// Only invalidate cached pages on explicit request
const EXPLICIT_INVAL_DATA: u32 = 33_554_432;
bitflags! {
/// A bitfield passed in as a parameter to and returned from the `init` method of the
/// `FileSystem` trait.
@ -341,6 +344,14 @@ bitflags! {
/// Setting (or not setting) the field in the `FsOptions` returned from the `init` method
/// has no effect.
const ZERO_MESSAGE_OPENDIR = NO_OPENDIR_SUPPORT;
/// Indicates support for explicit data invalidation. If this feature is enabled, the
/// server is fully responsible for data cache invalidation, and the kernel won't
/// invalidate files data cache on size change and only truncate that cache to new size
/// in case the size decreased.
///
/// This feature is not currently supported.
const EXPLICIT_INVAL_DATA = EXPLICIT_INVAL_DATA;
}
}