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authorFrederic Weisbecker <fweisbec@gmail.com>2009-04-14 02:10:35 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-14 09:18:01 +0400
commita412f9efdd6424bf4bf28c8e8c92060b5e975482 (patch)
treeb290d38a85c4b675af426dbd8593768bc5339fa1 /include/linux/reiserfs_fs.h
parent8ebc423238341b52912c7295b045a32477b33f09 (diff)
downloadlinux-a412f9efdd6424bf4bf28c8e8c92060b5e975482.tar.xz
reiserfs, kill-the-BKL: fix unsafe j_flush_mutex lock
Impact: fix a deadlock The j_flush_mutex is acquired safely in journal.c: if we can't take it, we free the reiserfs per superblock lock and wait a bit. But we have a remaining place in kupdate_transactions() where j_flush_mutex is still acquired traditionnaly. Thus the following scenario (warned by lockdep) can happen: A B mutex_lock(&write_lock) mutex_lock(&write_lock) mutex_lock(&j_flush_mutex) mutex_lock(&j_flush_mutex) //block mutex_unlock(&write_lock) sleep... mutex_lock(&write_lock) //deadlock Fix this by using reiserfs_mutex_lock_safe() in kupdate_transactions(). Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@texware.it> Cc: Jeff Mahoney <jeffm@suse.com> LKML-Reference: <1239660635-12940-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/reiserfs_fs.h')
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