Patchwork [v4,02/19] block: make bdrv_set_enable_write_cache() modify open_flags

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Submitter Jeff Cody
Date Sept. 20, 2012, 7:13 p.m.
Message ID <83d32be6a2bbecce4e3ebf156498f92021e2f5b1.1348157913.git.jcody@redhat.com>
Download mbox | patch
Permalink /patch/185443/
State New
Headers show

Comments

Jeff Cody - Sept. 20, 2012, 7:13 p.m.
bdrv_set_enable_write_cache() sets the bs->enable_write_cache flag,
but without the flag recorded in bs->open_flags, then next time
a reopen() is performed the enable_write_cache setting may be
inadvertently lost.

This will set the flag in open_flags, so it is preserved across
reopens.

Signed-off-by: Jeff Cody <jcody@redhat.com>
---
 block.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

diff --git a/block.c b/block.c
index 4c0e7f5..458bcc9 100644
--- a/block.c
+++ b/block.c
@@ -2168,6 +2168,13 @@  int bdrv_enable_write_cache(BlockDriverState *bs)
 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce)
 {
     bs->enable_write_cache = wce;
+
+    /* so a reopen() will preserve wce */
+    if (wce) {
+        bs->open_flags |= BDRV_O_CACHE_WB;
+    } else {
+        bs->open_flags &= ~BDRV_O_CACHE_WB;
+    }
 }
 
 int bdrv_is_encrypted(BlockDriverState *bs)