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From: Christian Ebner <c.ebner@proxmox.com>
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Date: Wed, 28 Feb 2024 15:02:22 +0100
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Subject: [pbs-devel] [RFC proxmox-backup 32/36] pxar: caching: add
look-ahead cache types
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The look-ahead cache is used to cache entries during pxar archive
creation before encoding, in order to decide if regular file payloads
might be re-used rather than re-encoded.
These types allow to store the needed data and keep track of
directory boundaries while traversing the filesystem tree.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
pbs-client/src/pxar/lookahead_cache.rs | 38 ++++++++++++++++++++++++++
pbs-client/src/pxar/mod.rs | 1 +
2 files changed, 39 insertions(+)
create mode 100644 pbs-client/src/pxar/lookahead_cache.rs
diff --git a/pbs-client/src/pxar/lookahead_cache.rs b/pbs-client/src/pxar/lookahead_cache.rs
new file mode 100644
index 00000000..68f3fd1f
--- /dev/null
+++ b/pbs-client/src/pxar/lookahead_cache.rs
@@ -0,0 +1,38 @@
+use nix::sys::stat::FileStat;
+use pxar::encoder::PayloadOffset;
+use std::ffi::CString;
+use std::os::unix::io::OwnedFd;
+
+use pxar::Metadata;
+
+pub(crate) struct CacheEntryData {
+ pub(crate) fd: OwnedFd,
+ pub(crate) c_file_name: CString,
+ pub(crate) stat: FileStat,
+ pub(crate) metadata: Metadata,
+ pub(crate) payload_offset: PayloadOffset,
+}
+
+impl CacheEntryData {
+ pub(crate) fn new(
+ fd: OwnedFd,
+ c_file_name: CString,
+ stat: FileStat,
+ metadata: Metadata,
+ payload_offset: PayloadOffset,
+ ) -> Self {
+ Self {
+ fd,
+ c_file_name,
+ stat,
+ metadata,
+ payload_offset,
+ }
+ }
+}
+
+pub(crate) enum CacheEntry {
+ RegEntry(CacheEntryData),
+ DirEntry(CacheEntryData),
+ DirEnd,
+}
diff --git a/pbs-client/src/pxar/mod.rs b/pbs-client/src/pxar/mod.rs
index 24315f5f..3729ab10 100644
--- a/pbs-client/src/pxar/mod.rs
+++ b/pbs-client/src/pxar/mod.rs
@@ -50,6 +50,7 @@
pub(crate) mod create;
pub(crate) mod dir_stack;
pub(crate) mod extract;
+pub(crate) mod lookahead_cache;
pub(crate) mod metadata;
pub(crate) mod tools;
--
2.39.2