From 572a3d1e5d3a3e335b92e2c28a63c0b27944480c Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Mon, 21 Aug 2023 10:39:20 -0700 Subject: tmpfs,xattr: GFP_KERNEL_ACCOUNT for simple xattrs It is particularly important for the userns mount case (when a sensible nr_inodes maximum may not be enforced) that tmpfs user xattrs be subject to memory cgroup limiting. Leave temporary buffer allocations as is, but change the persistent simple xattr allocations from GFP_KERNEL to GFP_KERNEL_ACCOUNT. This limits kernfs's cgroupfs too, but that's good. (I had intended to send this change earlier, but had been confused by shmem_alloc_inode() using GFP_KERNEL, and thought a discussion would be needed to change that too: no, I was forgetting the SLAB_ACCOUNT on that kmem_cache, which implicitly adds __GFP_ACCOUNT to all its allocations.) Signed-off-by: Hugh Dickins Reviewed-by: Jan Kara Message-Id: Signed-off-by: Christian Brauner --- mm/shmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/shmem.c') diff --git a/mm/shmem.c b/mm/shmem.c index b782edeb69aa..11298c797cdc 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3616,7 +3616,7 @@ static int shmem_initxattrs(struct inode *inode, len = strlen(xattr->name) + 1; new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len, - GFP_KERNEL); + GFP_KERNEL_ACCOUNT); if (!new_xattr->name) { kvfree(new_xattr); break; -- cgit v1.2.3