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Add support for file io passthrough

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If using Linux 6.9 or above and enabled (passthrough=true) files
opened or created will use the FUSE passthrough feature.

If direct-io=true / cache.files=off it will override passthrough. If
direct-io-allow-mmap is enabled only mmap will passthrough.

HANDLE_KILLPRIV and V2 are enabled now by default to remove the
kernel's need to issue getattr and getxattr requests.

moveonenospc will not work when leveraging passthrough.
This commit is contained in:
Antonio SJ Musumeci 2024-03-24 23:32:26 -05:00
parent b21172c609
commit 07e7d76b7c
18 changed files with 1673 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

49
src/fuse_create.cpp
View file

@ -170,6 +170,29 @@ namespace l
return 0;
}
static
int
passthrough(const fuse_context *fc_,
fuse_file_info_t *ffi_)
{
int backing_id;
FileInfo *fi;
const ugid::SetRootGuard ugid;
fi = reinterpret_cast<FileInfo*>(ffi_->fh);
backing_id = fuse_passthrough_open(fc_,fi->fd);
if(backing_id <= 0)
return 0;
ffi_->passthrough = true;
ffi_->keep_cache = false;
fi->backing_id = backing_id;
ffi_->backing_id = backing_id;
return 0;
}
static
int
create(const Policy::Search &searchFunc_,
@ -208,6 +231,15 @@ namespace l
}
}
constexpr
const
uint64_t
_(const PassthroughEnum e_,
const uint64_t m_)
{
return ((((uint64_t)e_) << 32) | (m_ & O_ACCMODE));
}
namespace FUSE
{
int
@ -247,6 +279,23 @@ namespace FUSE
fc->umask);
}
if(rv != 0)
return rv;
switch(_(cfg->passthrough,ffi_->flags))
{
case _(PassthroughEnum::r, O_RDONLY):
case _(PassthroughEnum::r, O_RDWR):
case _(PassthroughEnum::w, O_WRONLY):
case _(PassthroughEnum::w, O_RDWR):
case _(PassthroughEnum::ro,O_RDONLY):
case _(PassthroughEnum::wo,O_WRONLY):
case _(PassthroughEnum::rw,O_RDONLY):
case _(PassthroughEnum::rw,O_WRONLY):
case _(PassthroughEnum::rw,O_RDWR):
return l::passthrough(fc,ffi_);
}
return rv;
}
}