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authorAbhi Das <adas@redhat.com>2019-05-01 00:53:47 +0300
committerAndreas Gruenbacher <agruenba@redhat.com>2019-05-08 00:39:14 +0300
commit8f91821990fd6f170a5dca79697a441181a41b16 (patch)
tree6efd729419e769c9a86681b5a8aca56e6c3e5995 /fs/gfs2/incore.h
parentfbb27873f21d5fb9bf556edcaa67e9891636e5d4 (diff)
downloadlinux-8f91821990fd6f170a5dca79697a441181a41b16.tar.xz
gfs2: fix race between gfs2_freeze_func and unmount
As part of the freeze operation, gfs2_freeze_func() is left blocking on a request to hold the sd_freeze_gl in SH. This glock is held in EX by the gfs2_freeze() code. A subsequent call to gfs2_unfreeze() releases the EXclusively held sd_freeze_gl, which allows gfs2_freeze_func() to acquire it in SH and resume its operation. gfs2_unfreeze(), however, doesn't wait for gfs2_freeze_func() to complete. If a umount is issued right after unfreeze, it could result in an inconsistent filesystem because some journal data (statfs update) isn't written out. Refer to commit 24972557b12c for a more detailed explanation of how freeze/unfreeze work. This patch causes gfs2_unfreeze() to wait for gfs2_freeze_func() to complete before returning to the user. Signed-off-by: Abhi Das <adas@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 78c8e761b321..b15755068593 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -621,6 +621,7 @@ enum {
SDF_SKIP_DLM_UNLOCK = 8,
SDF_FORCE_AIL_FLUSH = 9,
SDF_AIL1_IO_ERROR = 10,
+ SDF_FS_FROZEN = 11,
};
enum gfs2_freeze_state {