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authorConnor Brewster <cbrewster@hey.com>2023-09-16T18·54-0500
committerclbot <clbot@tvl.fyi>2023-09-20T14·27+0000
commit7e737fde34260daa477794d63b0b3344b4a1d81b (patch)
tree51f7d4b3c7f18aa78e584b06840fcdd645474895 /tvix/store/src/fs/file_attr.rs
parent6b7c936bc50934b45df132f659292e2c45256dea (diff)
refactor(tvix/store/fs): Separate FUSE and filesystem code r/6622
In prepration for adding virtiofs support, I thought it would make sense
to split out the filesystem implementation from FUSE itself.

The `fs` module holds the tvix-store filesystem implemetation and the
`fuse` module holds the code to spawn a FUSE daemon backed by multiple
threads.

Change-Id: I8c58447b8c3aa016a613068f8e7ec166554e237c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9343
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: Connor Brewster <cbrewster@hey.com>
Diffstat (limited to 'tvix/store/src/fs/file_attr.rs')
-rw-r--r--tvix/store/src/fs/file_attr.rs46
1 files changed, 46 insertions, 0 deletions
diff --git a/tvix/store/src/fs/file_attr.rs b/tvix/store/src/fs/file_attr.rs
new file mode 100644
index 000000000000..b946aa977a0a
--- /dev/null
+++ b/tvix/store/src/fs/file_attr.rs
@@ -0,0 +1,46 @@
+use super::inodes::{DirectoryInodeData, InodeData};
+use fuse_backend_rs::abi::fuse_abi::Attr;
+
+/// The [Attr] describing the root
+pub const ROOT_FILE_ATTR: Attr = Attr {
+    ino: fuse_backend_rs::api::filesystem::ROOT_ID,
+    size: 0,
+    blksize: 1024,
+    blocks: 0,
+    mode: libc::S_IFDIR | 0o555,
+    atime: 0,
+    mtime: 0,
+    ctime: 0,
+    atimensec: 0,
+    mtimensec: 0,
+    ctimensec: 0,
+    nlink: 0,
+    uid: 0,
+    gid: 0,
+    rdev: 0,
+    flags: 0,
+};
+
+/// for given &Node and inode, construct an [Attr]
+pub fn gen_file_attr(inode_data: &InodeData, inode: u64) -> Attr {
+    Attr {
+        ino: inode,
+        // FUTUREWORK: play with this numbers, as it affects read sizes for client applications.
+        blocks: 1024,
+        size: match inode_data {
+            InodeData::Regular(_, size, _) => *size as u64,
+            InodeData::Symlink(target) => target.len() as u64,
+            InodeData::Directory(DirectoryInodeData::Sparse(_, size)) => *size as u64,
+            InodeData::Directory(DirectoryInodeData::Populated(_, ref children)) => {
+                children.len() as u64
+            }
+        },
+        mode: match inode_data {
+            InodeData::Regular(_, _, false) => libc::S_IFREG | 0o444, // no-executable files
+            InodeData::Regular(_, _, true) => libc::S_IFREG | 0o555,  // executable files
+            InodeData::Symlink(_) => libc::S_IFLNK | 0o444,
+            InodeData::Directory(_) => libc::S_IFDIR | 0o555,
+        },
+        ..Default::default()
+    }
+}