From ad7368498e8495e93592c4acfe854bcc7660f92c Mon Sep 17 00:00:00 2001
From: Christoph Herzog <chris@theduke.at>
Date: Mon, 5 Jun 2023 19:08:12 +0200
Subject: [PATCH] feat(virtual-fs): Add FsError::StorageFull variant

Needed for some applciations, like the FsMemoryLimiter.

Followup to #3865
---
 lib/virtual-fs/src/lib.rs | 8 ++++++++
 lib/wasi/src/fs/mod.rs    | 1 +
 2 files changed, 9 insertions(+)

diff --git a/lib/virtual-fs/src/lib.rs b/lib/virtual-fs/src/lib.rs
index f39a05b15de..f88dd97f574 100644
--- a/lib/virtual-fs/src/lib.rs
+++ b/lib/virtual-fs/src/lib.rs
@@ -462,6 +462,8 @@ pub enum FsError {
     /// Directory not Empty
     #[error("directory not empty")]
     DirectoryNotEmpty,
+    #[error("storage full")]
+    StorageFull,
     /// Some other unhandled error. If you see this, it's probably a bug.
     #[error("unknown error found")]
     UnknownError,
@@ -487,6 +489,8 @@ impl From<io::Error> for FsError {
             io::ErrorKind::UnexpectedEof => FsError::UnexpectedEof,
             io::ErrorKind::WouldBlock => FsError::WouldBlock,
             io::ErrorKind::WriteZero => FsError::WriteZero,
+            // NOTE: Add this once the "io_error_more" Rust feature is stabilized
+            // io::ErrorKind::StorageFull => FsError::StorageFull,
             io::ErrorKind::Other => FsError::IOError,
             // if the following triggers, a new error type was added to this non-exhaustive enum
             _ => FsError::UnknownError,
@@ -522,6 +526,10 @@ impl From<FsError> for io::Error {
             FsError::NoDevice => io::ErrorKind::Other,
             FsError::DirectoryNotEmpty => io::ErrorKind::Other,
             FsError::UnknownError => io::ErrorKind::Other,
+            FsError::StorageFull => io::ErrorKind::Other,
+            // NOTE: Add this once the "io_error_more" Rust feature is stabilized
+            // io::ErrorKind::StorageFull => FsError::StorageFull,
+            // FsError::StorageFull => io::ErrorKind::StorageFull,
         };
         kind.into()
     }
diff --git a/lib/wasi/src/fs/mod.rs b/lib/wasi/src/fs/mod.rs
index 851355b985d..0c561b6b763 100644
--- a/lib/wasi/src/fs/mod.rs
+++ b/lib/wasi/src/fs/mod.rs
@@ -1884,6 +1884,7 @@ pub fn fs_error_into_wasi_err(fs_error: FsError) -> Errno {
         FsError::WouldBlock => Errno::Again,
         FsError::WriteZero => Errno::Nospc,
         FsError::DirectoryNotEmpty => Errno::Notempty,
+        FsError::StorageFull => Errno::Overflow,
         FsError::Lock | FsError::UnknownError => Errno::Io,
     }
 }