Re: [PATCH v16 06/11] mm: introduce memfd_secret system call to create "secret" memory areas
From: Michal Hocko <mhocko@suse.com>
Date: 2021-02-03 12:16:58
Also in:
linux-api, linux-arch, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml, nvdimm
On Thu 21-01-21 14:27:18, Mike Rapoport wrote:
+static struct file *secretmem_file_create(unsigned long flags)
+{
+ struct file *file = ERR_PTR(-ENOMEM);
+ struct secretmem_ctx *ctx;
+ struct inode *inode;
+
+ inode = alloc_anon_inode(secretmem_mnt->mnt_sb);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ goto err_free_inode;
+
+ file = alloc_file_pseudo(inode, secretmem_mnt, "secretmem",
+ O_RDWR, &secretmem_fops);
+ if (IS_ERR(file))
+ goto err_free_ctx;
+
+ mapping_set_unevictable(inode->i_mapping);Btw. you need also mapping_set_gfp_mask(mapping, GFP_HIGHUSER) because the default is GFP_HIGHUSER_MOVABLE and you do not support migration so no pages from movable zones should be allowed. -- Michal Hocko SUSE Labs _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel