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jfs: fix a couple races

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commit 73aaa22d5f upstream.

This patch fixes races uncovered by xfstests testcase 068.

One race is the result of jfs_sync() trying to write a sync point to the
journal after it has been frozen (or possibly in the process). Since
freezing sync's the journal, there is no need to write a sync point so
we simply want to return.

The second involves jfs_write_inode() being called on a deleted inode.
It calls jfs_flush_journal which is held up by the jfs_commit thread
doing the final iput on the same deleted inode, which itself is
waiting for the I_SYNC flag to be cleared. jfs_write_inode need not
do anything when i_nlink is zero, which is the easy fix.

Reported-by: Michael L. Semon <mlsemon35@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Kleikamp 2013-05-01 11:08:38 -05:00 committed by Greg Kroah-Hartman
parent e3f7e71f94
commit 2e6c53ddad
2 changed files with 3 additions and 2 deletions
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2
fs/jfs/inode.c
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@ -125,7 +125,7 @@ int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
int wait = wbc->sync_mode == WB_SYNC_ALL;
if (test_cflag(COMMIT_Nolink, inode))
if (inode->i_nlink == 0)
return 0;
/*
* If COMMIT_DIRTY is not set, the inode isn't really dirty.

3
fs/jfs/jfs_logmgr.c
View file

@ -1058,7 +1058,8 @@ static int lmLogSync(struct jfs_log * log, int hard_sync)
*/
void jfs_syncpt(struct jfs_log *log, int hard_sync)
{ LOG_LOCK(log);
lmLogSync(log, hard_sync);
if (!test_bit(log_QUIESCE, &log->flag))
lmLogSync(log, hard_sync);
LOG_UNLOCK(log);
}