From 4f1e627105e55e1e2ee6d6e9138912880c186dd0 Mon Sep 17 00:00:00 2001 From: Badari Pulavarty Date: Fri, 22 Dec 2006 01:06:23 -0800 Subject: [PATCH] Fix for shmem_truncate_range() BUG_ON() Ran into BUG() while doing madvise(REMOVE) testing. If we are punching a hole into shared memory segment using madvise(REMOVE) and the entire hole is below the indirect blocks, we hit following assert. BUG_ON(limit <= SHMEM_NR_DIRECT); Signed-off-by: Badari Pulavarty Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman --- mm/shmem.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/shmem.c b/mm/shmem.c index db21c51531ca8..7013af1bcd003 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -510,7 +510,12 @@ static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) size = SHMEM_NR_DIRECT; nr_swaps_freed = shmem_free_swp(ptr+idx, ptr+size); } - if (!topdir) + + /* + * If there are no indirect blocks or we are punching a hole + * below indirect blocks, nothing to be done. + */ + if (!topdir || (punch_hole && (limit <= SHMEM_NR_DIRECT))) goto done2; BUG_ON(limit <= SHMEM_NR_DIRECT); -- 2.47.2