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pxar: Improve read performance for fuse.

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By storing the payload start offset in the `DirectoryEntry` and passing this
information to `Decoder::read()`, the payload can be read directly and a repeated
re-reading of the entry information is avoided.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Christian Ebner
2020-02-03 11:21:28 +01:00
committed by Wolfgang Bumiller
parent 032d3ad80f
commit 63698e720c
2 changed files with 29 additions and 41 deletions
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7
src/pxar/fuse.rs
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@ -538,8 +538,11 @@ impl Session {
}
extern "C" fn read(req: Request, inode: u64, size: size_t, offset: c_int, _fileinfo: MutPtr) {
Self::run_in_context(req, inode, |ctx| {
let mut data = ctx.decoder.read(ctx.ino_offset, size, offset as u64).map_err(|_| libc::EIO)?;
Self::run_with_context_refs(req, inode, |decoder, map, _gbt_cache, entry_cache, ino_offset| {
let entry = entry_cache.access(ino_offset, &mut EntryCacher { decoder, map })
.map_err(|_| libc::EIO)?
.ok_or_else(|| libc::EIO)?;
let mut data = decoder.read(&entry, size, offset as u64).map_err(|_| libc::EIO)?;
let _res = unsafe {
let len = data.len();