/** * eCryptfs: Linux filesystem encryption layer * * Copyright (C) 2008 International Business Machines Corp. * Author(s): Michael A. Halcrow * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #include #include #include #include #include #include "ecryptfs_kernel.h" struct ecryptfs_open_req { struct file **lower_file; struct path path; struct completion done; struct list_head kthread_ctl_list; }; static struct ecryptfs_kthread_ctl { #define ECRYPTFS_KTHREAD_ZOMBIE 0x00000001 u32 flags; struct mutex mux; struct list_head req_list; wait_queue_head_t wait; } ecryptfs_kthread_ctl; static struct task_struct *ecryptfs_kthread; /** * ecryptfs_threadfn * @ignored: ignored * * The eCryptfs kernel thread that has the responsibility of getting * the lower file with RW permissions. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_threadfn(void *ignored) { set_freezable(); while (1) { struct ecryptfs_open_req *req; wait_event_freezable( ecryptfs_kthread_ctl.wait, (!list_empty(&ecryptfs_kthread_ctl.req_list) || kthread_should_stop())); mutex_lock(&ecryptfs_kthread_ctl.mux); if (ecryptfs_kthread_ctl.flags & ECRYPTFS_KTHREAD_ZOMBIE) { mutex_unlock(&ecryptfs_kthread_ctl.mux); goto out; } while (!list_empty(&ecryptfs_kthread_ctl.req_list)) { req = list_first_entry(&ecryptfs_kthread_ctl.req_list, struct ecryptfs_open_req, kthread_ctl_list); list_del(&req->kthread_ctl_list); *req->lower_file = dentry_open(&req->path, (O_RDWR | O_LARGEFILE), current_cred()); complete(&req->done); } mutex_unlock(&ecryptfs_kthread_ctl.mux); } out: return 0; } int __init ecryptfs_init_kthread(void) { int rc = 0; mutex_init(&ecryptfs_kthread_ctl.mux); init_waitqueue_head(&ecryptfs_kthread_ctl.wait); INIT_LIST_HEAD(&ecryptfs_kthread_ctl.req_list); ecryptfs_kthread = kthread_run(&ecryptfs_threadfn, NULL, "ecryptfs-kthread"); if (IS_ERR(ecryptfs_kthread)) { rc = PTR_ERR(ecryptfs_kthread); printk(KERN_ERR "%s: Failed to create kernel thread; rc = [%d]" "\n", __func__, rc); } return rc; } void ecryptfs_destroy_kthread(void) { struct ecryptfs_open_req *req, *tmp; mutex_lock(&ecryptfs_kthread_ctl.mux); ecryptfs_kthread_ctl.flags |= ECRYPTFS_KTHREAD_ZOMBIE; list_for_each_entry_safe(req, tmp, &ecryptfs_kthread_ctl.req_list, kthread_ctl_list) { list_del(&req->kthread_ctl_list); *req->lower_file = ERR_PTR(-EIO); complete(&req->done); } mutex_unlock(&ecryptfs_kthread_ctl.mux); kthread_stop(ecryptfs_kthread); wake_up(&ecryptfs_kthread_ctl.wait); } /** * ecryptfs_privileged_open * @lower_file: Result of dentry_open by root on lower dentry * @lower_dentry: Lower dentry for file to open * @lower_mnt: Lower vfsmount for file to open * * This function gets a r/w file opened againt the lower dentry. * * Returns zero on success; non-zero otherwise */ int ecryptfs_privileged_open(struct file **lower_file, struct dentry *lower_dentry, struct vfsmount *lower_mnt, const struct cred *cred) { struct ecryptfs_open_req req; int flags = O_LARGEFILE; int rc = 0; init_completion(&req.done); req.lower_file = lower_file; req.path.dentry = lower_dentry; req.path.mnt = lower_mnt; /* Corresponding dput() and mntput() are done when the * lower file is fput() when all eCryptfs files for the inode are * released. */ flags |= IS_RDONLY(d_inode(lower_dentry)) ? O_RDONLY : O_RDWR; (*lower_file) = dentry_open(&req.path, flags, cred); if (!IS_ERR(*lower_file)) goto out; if ((flags & O_ACCMODE) == O_RDONLY) { rc = PTR_ERR((*lower_file)); goto out; } mutex_lock(&ecryptfs_kthread_ctl.mux); if (ecryptfs_kthread_ctl.flags & ECRYPTFS_KTHREAD_ZOMBIE) { rc = -EIO; mutex_unlock(&ecryptfs_kthread_ctl.mux); printk(KERN_ERR "%s: We are in the middle of shutting down; " "aborting privileged request to open lower file\n", __func__); goto out; } list_add_tail(&req.kthread_ctl_list, &ecryptfs_kthread_ctl.req_list); mutex_unlock(&ecryptfs_kthread_ctl.mux); wake_up(&ecryptfs_kthread_ctl.wait); wait_for_completion(&req.done); if (IS_ERR(*lower_file)) rc = PTR_ERR(*lower_file); out: return rc; } g>2016-12-25 14:30:04 -0800 committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-25 14:30:04 -0800 commit3ddc76dfc786cc6f87852693227fb0b1f124f807 (patch) tree8192b4721e05cf6823087f9696db8c0c8f144b02 /net/appletalk/ddp.c parentb272f732f888d4cf43c943a40c9aaa836f9b7431 (diff)parent1f3a8e49d8f28f498b8694464623ac20aebfe62a (diff)
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer type cleanups from Thomas Gleixner: "This series does a tree wide cleanup of types related to timers/timekeeping. - Get rid of cycles_t and use a plain u64. The type is not really helpful and caused more confusion than clarity - Get rid of the ktime union. The union has become useless as we use the scalar nanoseconds storage unconditionally now. The 32bit timespec alike storage got removed due to the Y2038 limitations some time ago. That leaves the odd union access around for no reason. Clean it up. Both changes have been done with coccinelle and a small amount of manual mopping up" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: ktime: Get rid of ktime_equal() ktime: Cleanup ktime_set() usage ktime: Get rid of the union clocksource: Use a plain u64 instead of cycle_t
Diffstat (limited to 'net/appletalk/ddp.c')