From: Hugh Dickins Date: Mon, 21 Aug 2023 17:39:20 +0000 (-0700) Subject: tmpfs,xattr: GFP_KERNEL_ACCOUNT for simple xattrs X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=572a3d1e5d3a3e335b92e2c28a63c0b27944480c;p=linux.git 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 --- diff --git a/fs/xattr.c b/fs/xattr.c index 2d607542281be..efd4736bc94b0 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -1093,7 +1093,7 @@ struct simple_xattr *simple_xattr_alloc(const void *value, size_t size) if (len < sizeof(*new_xattr)) return NULL; - new_xattr = kvmalloc(len, GFP_KERNEL); + new_xattr = kvmalloc(len, GFP_KERNEL_ACCOUNT); if (!new_xattr) return NULL; @@ -1217,7 +1217,7 @@ struct simple_xattr *simple_xattr_set(struct simple_xattrs *xattrs, if (!new_xattr) return ERR_PTR(-ENOMEM); - new_xattr->name = kstrdup(name, GFP_KERNEL); + new_xattr->name = kstrdup(name, GFP_KERNEL_ACCOUNT); if (!new_xattr->name) { simple_xattr_free(new_xattr); return ERR_PTR(-ENOMEM); diff --git a/mm/shmem.c b/mm/shmem.c index b782edeb69aa8..11298c797cdc5 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;