diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/notify/vfsmount_mark.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/notify/vfsmount_mark.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/ANDROID_3.4.5/fs/notify/vfsmount_mark.c b/ANDROID_3.4.5/fs/notify/vfsmount_mark.c deleted file mode 100644 index b7b4b0e8..00000000 --- a/ANDROID_3.4.5/fs/notify/vfsmount_mark.c +++ /dev/null @@ -1,195 +0,0 @@ -/* - * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com> - * - * 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, 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; see the file COPYING. If not, write to - * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/mount.h> -#include <linux/mutex.h> -#include <linux/spinlock.h> - -#include <linux/atomic.h> - -#include <linux/fsnotify_backend.h> -#include "fsnotify.h" -#include "../mount.h" - -void fsnotify_clear_marks_by_mount(struct vfsmount *mnt) -{ - struct fsnotify_mark *mark, *lmark; - struct hlist_node *pos, *n; - struct mount *m = real_mount(mnt); - LIST_HEAD(free_list); - - spin_lock(&mnt->mnt_root->d_lock); - hlist_for_each_entry_safe(mark, pos, n, &m->mnt_fsnotify_marks, m.m_list) { - list_add(&mark->m.free_m_list, &free_list); - hlist_del_init_rcu(&mark->m.m_list); - fsnotify_get_mark(mark); - } - spin_unlock(&mnt->mnt_root->d_lock); - - list_for_each_entry_safe(mark, lmark, &free_list, m.free_m_list) { - fsnotify_destroy_mark(mark); - fsnotify_put_mark(mark); - } -} - -void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group) -{ - fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_VFSMOUNT); -} - -/* - * Recalculate the mask of events relevant to a given vfsmount locked. - */ -static void fsnotify_recalc_vfsmount_mask_locked(struct vfsmount *mnt) -{ - struct mount *m = real_mount(mnt); - struct fsnotify_mark *mark; - struct hlist_node *pos; - __u32 new_mask = 0; - - assert_spin_locked(&mnt->mnt_root->d_lock); - - hlist_for_each_entry(mark, pos, &m->mnt_fsnotify_marks, m.m_list) - new_mask |= mark->mask; - m->mnt_fsnotify_mask = new_mask; -} - -/* - * Recalculate the mnt->mnt_fsnotify_mask, or the mask of all FS_* event types - * any notifier is interested in hearing for this mount point - */ -void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt) -{ - spin_lock(&mnt->mnt_root->d_lock); - fsnotify_recalc_vfsmount_mask_locked(mnt); - spin_unlock(&mnt->mnt_root->d_lock); -} - -void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark) -{ - struct vfsmount *mnt = mark->m.mnt; - - assert_spin_locked(&mark->lock); - assert_spin_locked(&mark->group->mark_lock); - - spin_lock(&mnt->mnt_root->d_lock); - - hlist_del_init_rcu(&mark->m.m_list); - mark->m.mnt = NULL; - - fsnotify_recalc_vfsmount_mask_locked(mnt); - - spin_unlock(&mnt->mnt_root->d_lock); -} - -static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_group *group, - struct vfsmount *mnt) -{ - struct mount *m = real_mount(mnt); - struct fsnotify_mark *mark; - struct hlist_node *pos; - - assert_spin_locked(&mnt->mnt_root->d_lock); - - hlist_for_each_entry(mark, pos, &m->mnt_fsnotify_marks, m.m_list) { - if (mark->group == group) { - fsnotify_get_mark(mark); - return mark; - } - } - return NULL; -} - -/* - * given a group and vfsmount, find the mark associated with that combination. - * if found take a reference to that mark and return it, else return NULL - */ -struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, - struct vfsmount *mnt) -{ - struct fsnotify_mark *mark; - - spin_lock(&mnt->mnt_root->d_lock); - mark = fsnotify_find_vfsmount_mark_locked(group, mnt); - spin_unlock(&mnt->mnt_root->d_lock); - - return mark; -} - -/* - * Attach an initialized mark to a given group and vfsmount. - * These marks may be used for the fsnotify backend to determine which - * event types should be delivered to which groups. - */ -int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark, - struct fsnotify_group *group, struct vfsmount *mnt, - int allow_dups) -{ - struct mount *m = real_mount(mnt); - struct fsnotify_mark *lmark; - struct hlist_node *node, *last = NULL; - int ret = 0; - - mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT; - - assert_spin_locked(&mark->lock); - assert_spin_locked(&group->mark_lock); - - spin_lock(&mnt->mnt_root->d_lock); - - mark->m.mnt = mnt; - - /* is mark the first mark? */ - if (hlist_empty(&m->mnt_fsnotify_marks)) { - hlist_add_head_rcu(&mark->m.m_list, &m->mnt_fsnotify_marks); - goto out; - } - - /* should mark be in the middle of the current list? */ - hlist_for_each_entry(lmark, node, &m->mnt_fsnotify_marks, m.m_list) { - last = node; - - if ((lmark->group == group) && !allow_dups) { - ret = -EEXIST; - goto out; - } - - if (mark->group->priority < lmark->group->priority) - continue; - - if ((mark->group->priority == lmark->group->priority) && - (mark->group < lmark->group)) - continue; - - hlist_add_before_rcu(&mark->m.m_list, &lmark->m.m_list); - goto out; - } - - BUG_ON(last == NULL); - /* mark should be the last entry. last is the current last entry */ - hlist_add_after_rcu(last, &mark->m.m_list); -out: - fsnotify_recalc_vfsmount_mask_locked(mnt); - spin_unlock(&mnt->mnt_root->d_lock); - - return ret; -} |