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| author | Dave Chinner <dchinner@redhat.com> | 2018-06-07 07:46:42 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-08 10:07:51 -0700 |
| commit | 4a2d01b076d231afebbea04647373644e767b453 (patch) | |
| tree | cbc2479bf4ca80dc56e6b67beb77a28d3415eae0 /fs/nfs_common | |
| parent | ef215e394eeb960ea0e8a0fd37ba2fa30260e05b (diff) | |
| download | linux-4a2d01b076d231afebbea04647373644e767b453.tar.bz2 | |
xfs: xfs_reflink_convert_cow() memory allocation deadlock
xfs_reflink_convert_cow() manipulates the incore extent list
in GFP_KERNEL context in the IO submission path whilst holding
locked pages under writeback. This is a memory reclaim deadlock
vector. This code is not in a transaction, so any memory allocations
it makes aren't protected via the memalloc_nofs_save() context that
transactions carry.
Hence we need to run this call under memalloc_nofs_save() context to
prevent potential memory allocations from being run as GFP_KERNEL
and deadlocking.
Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/nfs_common')
0 files changed, 0 insertions, 0 deletions