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authorJakob Unterwurzacher2018-07-02 23:54:37 +0200
committerJakob Unterwurzacher2018-07-02 23:54:37 +0200
commit893e41149ed353f355047003b89eeff456990e76 (patch)
tree86c7708ca3adbb49b6cbc53d410645160fcb2610 /internal/fusefrontend/fs.go
parentc51fc9e07d287a95ce70b9fd8de8ea09a1d934c2 (diff)
fusefrontend: disallow O_DIRECT and fall back to buffered IO
O_DIRECT accesses must be aligned in both offset and length. Due to our crypto header, alignment will be off, even if userspace makes aligned accesses. Running xfstests generic/013 on ext4 used to trigger lots of EINVAL errors due to missing alignment. Just fall back to buffered IO.
Diffstat (limited to 'internal/fusefrontend/fs.go')
-rw-r--r--internal/fusefrontend/fs.go5
1 files changed, 5 insertions, 0 deletions
diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index f66e6d4..2cdc362 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -101,6 +101,11 @@ func (fs *FS) mangleOpenFlags(flags uint32) (newFlags int) {
}
// We also cannot open the file in append mode, we need to seek back for RMW
newFlags = newFlags &^ os.O_APPEND
+ // O_DIRECT accesses must be aligned in both offset and length. Due to our
+ // crypto header, alignment will be off, even if userspace makes aligned
+ // accesses. Running xfstests generic/013 on ext4 used to trigger lots of
+ // EINVAL errors due to missing alignment. Just fall back to buffered IO.
+ newFlags = newFlags &^ syscall.O_DIRECT
return newFlags
}