diff options
| author | Christoph Hellwig <hch@infradead.org> | 2009-02-24 08:39:02 -0500 |
|---|---|---|
| committer | Felix Blyakher <felixb@sgi.com> | 2009-04-30 01:29:02 -0400 |
| commit | 28e211700a81b0a934b6c7a4b8e7dda843634d2f (patch) | |
| tree | 234d0754b9a5c9bc3b0ae890eeef57aa7d1ee29e /kernel/sys.c | |
| parent | 5f79ed685fc6122018c4b5826e2e5bdb7bc6f109 (diff) | |
xfs: fix getbmap vs mmap deadlock
xfs_getbmap (or rather the formatters called by it) copy out the getbmap
structures under the ilock, which can deadlock against mmap. This has
been reported via bugzilla a while ago (#717) and has recently also
shown up via lockdep.
So allocate a temporary buffer to format the kernel getbmap structures
into and then copy them out after dropping the locks.
A little problem with this is that we limit the number of extents we
can copy out by the maximum allocation size, but I see no real way
around that.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'kernel/sys.c')
0 files changed, 0 insertions, 0 deletions