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| author | Kazuya Mio <[email protected]> | 2011-12-01 07:51:07 +0000 |
|---|---|---|
| committer | Al Viro <[email protected]> | 2012-01-17 21:38:47 +0000 |
| commit | e1616300a20c80396109c1cf013ba9a36055a3da (patch) | |
| tree | 97d4bcef12fddf1dc1cdfd22bf226eb36850c6e6 /lib/timerqueue.c | |
| parent | Merge branch 'x86/rdrand' of git://git.kernel.org/pub/scm/linux/kernel/git/ti... (diff) | |
| download | kernel-e1616300a20c80396109c1cf013ba9a36055a3da.tar.gz kernel-e1616300a20c80396109c1cf013ba9a36055a3da.zip | |
wake up s_wait_unfrozen when ->freeze_fs fails
dd slept infinitely when fsfeeze failed because of EIO.
To fix this problem, if ->freeze_fs fails, freeze_super() wakes up
the tasks waiting for the filesystem to become unfrozen.
When s_frozen isn't SB_UNFROZEN in __generic_file_aio_write(),
the function sleeps until FITHAW ioctl wakes up s_wait_unfrozen.
However, if ->freeze_fs fails, s_frozen is set to SB_UNFROZEN and then
freeze_super() returns an error number. In this case, FITHAW ioctl returns
EINVAL because s_frozen is already SB_UNFROZEN. There is no way to wake up
s_wait_unfrozen, so __generic_file_aio_write() sleeps infinitely.
Signed-off-by: Kazuya Mio <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Diffstat (limited to 'lib/timerqueue.c')
0 files changed, 0 insertions, 0 deletions