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authorDavid Chinner <dgc@sgi.com>2007-06-18 02:50:17 -0400
committerTim Shimmin <tes@chook.melbourne.sgi.com>2007-07-14 01:33:38 -0400
commit641c56fbfeae85d5ec87fee90a752f7b7224f236 (patch)
treec626d0f48ef54031f3af502e75308c9087e4592f /scripts/checksyscalls.sh
parent0164af51cedf46e1d58fd53854373f544150c597 (diff)
[XFS] Prevent deadlock when flushing inodes on unmount
When we are unmounting the filesystem, we flush all the inodes to disk. Unfortunately, if we have an inode cluster that has just been freed and marked stale sitting in an incore log buffer (i.e. hasn't been flushed to disk), it will be holding all the flush locks on the inodes in that cluster. xfs_iflush_all() which is called during unmount walks all the inodes trying to reclaim them, and it doing so calls xfs_finish_reclaim() on each inode. If the inode is dirty, if grabs the flush lock and flushes it. Unfortunately, find dirty inodes that already have their flush lock held and so we sleep. At this point in the unmount process, we are running single-threaded. There is nothing more that can push on the log to force the transaction holding the inode flush locks to disk and hence we deadlock. The fix is to issue a log force before flushing the inodes on unmount so that all the flush locks will be released before we start flushing the inodes. SGI-PV: 964538 SGI-Modid: xfs-linux-melb:xfs-kern:28862a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'scripts/checksyscalls.sh')
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