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| author | Abhi Das <adas@redhat.com> | 2019-04-30 16:53:47 -0500 |
|---|---|---|
| committer | Andreas Gruenbacher <agruenba@redhat.com> | 2019-05-07 23:39:14 +0200 |
| commit | 8f91821990fd6f170a5dca79697a441181a41b16 (patch) | |
| tree | 6efd729419e769c9a86681b5a8aca56e6c3e5995 /fs/gfs2/incore.h | |
| parent | fbb27873f21d5fb9bf556edcaa67e9891636e5d4 (diff) | |
| download | linux-8f91821990fd6f170a5dca79697a441181a41b16.tar.gz | |
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.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 78c8e761b32185..b1575506859318 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 { |