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authorJan Kara <jack@suse.cz>2011-06-23 22:51:47 +0200
committerJoel Becker <jlbec@evilplan.org>2011-07-28 02:07:19 -0700
commitc7e25e6e0b0486492c5faaf6312b37413642c48e (patch)
treec097a213a8eb2ad336fb2ef8046d2e71f0fa1f4a /fs/udf/inode.c
parenta11f7e63c59810a81494d4c4b028af707d4c7ca4 (diff)
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ocfs2: Avoid livelock in ocfs2_readpage()
When someone writes to an inode, readers accessing the same inode via ocfs2_readpage() just busyloop trying to get ip_alloc_sem because do_generic_file_read() looks up the page again and retries ->readpage() when previous attempt failed with AOP_TRUNCATED_PAGE. When there are enough readers, they can occupy all CPUs and in non-preempt kernel the system is deadlocked because writer holding ip_alloc_sem is never run to release the semaphore. Fix the problem by making reader block on ip_alloc_sem to break the busy loop. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Joel Becker <jlbec@evilplan.org>
Diffstat (limited to 'fs/udf/inode.c')
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