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fuse: Set direct_io and parallel_direct_writes

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In fuse_open(), set these flags:
- direct_io: We probably actually don't want to have the host page cache
  be used for our exports.  QEMU block exports are supposed to represent
  the image as-is (and thus potentially changing).
  This causes a change in iotest 308's reference output.

- parallel_direct_writes: We can (now) cope with parallel writes, so we
  should set this flag.  For some reason, it doesn't seem to make an
  actual performance difference with libfuse, but it does make a
  difference without it, so let's set it.
  (See "fuse: Copy write buffer content before polling" for further
  discussion.)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-ID: <20260309150856.26800-9-hreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Hanna Czenczek
2026-03-09 16:08:39 +01:00
committed by Kevin Wolf
parent c2959a8122
commit 8599559580
2 changed files with 3 additions and 1 deletions
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2
block/export/fuse.c
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@@ -582,6 +582,8 @@ static void fuse_setattr(fuse_req_t req, fuse_ino_t inode, struct stat *statbuf,
static void fuse_open(fuse_req_t req, fuse_ino_t inode,
struct fuse_file_info *fi)
{
fi->direct_io = true;
fi->parallel_direct_writes = true;
fuse_reply_open(req, fi);
}

2
tests/qemu-iotests/308.out
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@@ -131,7 +131,7 @@ wrote 65536/65536 bytes at offset 1048576
--- Try growing non-growable export ---
(OK: Lengths of export and original are the same)
dd: error writing 'TEST_DIR/t.IMGFMT.fuse': Input/output error
dd: error writing 'TEST_DIR/t.IMGFMT.fuse': No space left on device
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