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authorSahitya Tummala <stummala@codeaurora.org>2018-05-18 11:51:52 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-03 07:50:26 +0200
commitc92d09e35d2ddf8ec3e3e3c755241cfde670236c (patch)
treea2f2ed3eeafac037572e2eedda036963a3b528f8 /fs
parent4f979af7b0ad6d88723bf1ec117b6e44dca38148 (diff)
f2fs: Fix deadlock in shutdown ioctl
[ Upstream commit 60b2b4ee2bc01dd052f99fa9d65da2232102ef8e ] f2fs_ioc_shutdown() ioctl gets stuck in the below path when issued with F2FS_GOING_DOWN_FULLSYNC option. __switch_to+0x90/0xc4 percpu_down_write+0x8c/0xc0 freeze_super+0xec/0x1e4 freeze_bdev+0xc4/0xcc f2fs_ioctl+0xc0c/0x1ce0 f2fs_compat_ioctl+0x98/0x1f0 Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/f2fs/file.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 72c6a9e9a9b4..97537ce5127c 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1808,9 +1808,11 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
if (get_user(in, (__u32 __user *)arg))
return -EFAULT;
- ret = mnt_want_write_file(filp);
- if (ret)
- return ret;
+ if (in != F2FS_GOING_DOWN_FULLSYNC) {
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ return ret;
+ }
switch (in) {
case F2FS_GOING_DOWN_FULLSYNC:
@@ -1838,7 +1840,8 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
}
f2fs_update_time(sbi, REQ_TIME);
out:
- mnt_drop_write_file(filp);
+ if (in != F2FS_GOING_DOWN_FULLSYNC)
+ mnt_drop_write_file(filp);
return ret;
}