Return non-zero size for tmpfs statfs(2).

This does not implement accepting or enforcing any size limit, which will be
more complex and has performance implications; it just returns a fixed non-zero
size.

Updates #1936

PiperOrigin-RevId: 328428588

1 files changed, 6 insertions, 5 deletions

diff --git a/pkg/abi/linux/fs.go b/pkg/abi/linux/fs.go
index 158d2db5b..2b1ef0d4e 100644
--- a/pkg/abi/linux/fs.go
+++ b/pkg/abi/linux/fs.go
@@ -44,17 +44,18 @@ type Statfs struct {
 	// Type is one of the filesystem magic values, defined above.
 	Type uint64
 
-	// BlockSize is the data block size.
+	// BlockSize is the optimal transfer block size in bytes.
 	BlockSize int64
 
-	// Blocks is the number of data blocks in use.
+	// Blocks is the maximum number of data blocks the filesystem may store, in
+	// units of BlockSize.
 	Blocks uint64
 
-	// BlocksFree is the number of free blocks.
+	// BlocksFree is the number of free data blocks, in units of BlockSize.
 	BlocksFree uint64
 
-	// BlocksAvailable is the number of blocks free for use by
-	// unprivileged users.
+	// BlocksAvailable is the number of data blocks free for use by
+	// unprivileged users, in units of BlockSize.
 	BlocksAvailable uint64
 
 	// Files is the number of used file nodes on the filesystem.