On 05/12/2012 08:02 PM, Hugh Dickins wrote:
Let tmpfs into the NOSEC optimization (avoiding file_remove_suid()
overhead on most common writes): set MS_NOSEC on its superblocks.
Signed-off-by: Hugh Dickins<hughd@xxxxxxxxxx>
---
mm/shmem.c | 1 +
1 file changed, 1 insertion(+)
--- 3045N.orig/mm/shmem.c 2012-05-05 10:45:17.888060878 -0700
+++ 3045N/mm/shmem.c 2012-05-05 10:46:05.732062006 -0700
@@ -2361,6 +2361,7 @@ int shmem_fill_super(struct super_block
}
}
sb->s_export_op =&shmem_export_ops;
+ sb->s_flags |= MS_NOSEC;
Isn't setting the flag on inode better? Something like:
diff --git a/mm/shmem.c b/mm/shmem.c
index f99ff3e..7d98fb5 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2325,6 +2325,7 @@ static void shmem_init_inode(void *foo)
{
struct shmem_inode_info *info = foo;
inode_init_once(&info->vfs_inode);
+ info->vfs_inode.i_flags |= S_NOSEC;
}
static int shmem_init_inodecache(void)
--
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