From 622d81494fa32343a4b97b607619656c7a4a6d1a Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Thu, 23 Dec 2010 11:57:37 +1100 Subject: [PATCH] xfs: use KM_NOFS for allocations during attribute list operations When listing attributes, we are doiing memory allocations under the inode ilock using only KM_SLEEP. This allows memory allocation to recurse back into the filesystem and do writeback, which may the ilock we already hold on the current inode. THis will deadlock. Hence use KM_NOFS for such allocations outside of transaction context to ensure that reclaim recursion does not occur. Reported-by: Nick Piggin Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_attr_leaf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_attr_leaf.c b/fs/xfs/xfs_attr_leaf.c index a6cff8edcdb6..71e90dc2aeb1 100644 --- a/fs/xfs/xfs_attr_leaf.c +++ b/fs/xfs/xfs_attr_leaf.c @@ -637,7 +637,7 @@ xfs_attr_shortform_list(xfs_attr_list_context_t *context) * It didn't all fit, so we have to sort everything on hashval. */ sbsize = sf->hdr.count * sizeof(*sbuf); - sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP); + sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP | KM_NOFS); /* * Scan the attribute list for the rest of the entries, storing @@ -2386,7 +2386,7 @@ xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context) args.dp = context->dp; args.whichfork = XFS_ATTR_FORK; args.valuelen = valuelen; - args.value = kmem_alloc(valuelen, KM_SLEEP); + args.value = kmem_alloc(valuelen, KM_SLEEP | KM_NOFS); args.rmtblkno = be32_to_cpu(name_rmt->valueblk); args.rmtblkcnt = XFS_B_TO_FSB(args.dp->i_mount, valuelen); retval = xfs_attr_rmtval_get(&args); -- 2.34.1