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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/notify/fsnotify.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/fs/notify/fsnotify.c')
-rw-r--r--ANDROID_3.4.5/fs/notify/fsnotify.c311
1 files changed, 0 insertions, 311 deletions
diff --git a/ANDROID_3.4.5/fs/notify/fsnotify.c b/ANDROID_3.4.5/fs/notify/fsnotify.c
deleted file mode 100644
index ccb14d3f..00000000
--- a/ANDROID_3.4.5/fs/notify/fsnotify.c
+++ /dev/null
@@ -1,311 +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/dcache.h>
-#include <linux/fs.h>
-#include <linux/gfp.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mount.h>
-#include <linux/srcu.h>
-
-#include <linux/fsnotify_backend.h>
-#include "fsnotify.h"
-#include "../mount.h"
-
-/*
- * Clear all of the marks on an inode when it is being evicted from core
- */
-void __fsnotify_inode_delete(struct inode *inode)
-{
- fsnotify_clear_marks_by_inode(inode);
-}
-EXPORT_SYMBOL_GPL(__fsnotify_inode_delete);
-
-void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
-{
- fsnotify_clear_marks_by_mount(mnt);
-}
-
-/*
- * Given an inode, first check if we care what happens to our children. Inotify
- * and dnotify both tell their parents about events. If we care about any event
- * on a child we run all of our children and set a dentry flag saying that the
- * parent cares. Thus when an event happens on a child it can quickly tell if
- * if there is a need to find a parent and send the event to the parent.
- */
-void __fsnotify_update_child_dentry_flags(struct inode *inode)
-{
- struct dentry *alias;
- int watched;
-
- if (!S_ISDIR(inode->i_mode))
- return;
-
- /* determine if the children should tell inode about their events */
- watched = fsnotify_inode_watches_children(inode);
-
- spin_lock(&inode->i_lock);
- /* run all of the dentries associated with this inode. Since this is a
- * directory, there damn well better only be one item on this list */
- list_for_each_entry(alias, &inode->i_dentry, d_alias) {
- struct dentry *child;
-
- /* run all of the children of the original inode and fix their
- * d_flags to indicate parental interest (their parent is the
- * original inode) */
- spin_lock(&alias->d_lock);
- list_for_each_entry(child, &alias->d_subdirs, d_u.d_child) {
- if (!child->d_inode)
- continue;
-
- spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
- if (watched)
- child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
- else
- child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;
- spin_unlock(&child->d_lock);
- }
- spin_unlock(&alias->d_lock);
- }
- spin_unlock(&inode->i_lock);
-}
-
-/* Notify this dentry's parent about a child's events. */
-int __fsnotify_parent(struct path *path, struct dentry *dentry, __u32 mask)
-{
- struct dentry *parent;
- struct inode *p_inode;
- int ret = 0;
-
- if (!dentry)
- dentry = path->dentry;
-
- if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
- return 0;
-
- parent = dget_parent(dentry);
- p_inode = parent->d_inode;
-
- if (unlikely(!fsnotify_inode_watches_children(p_inode)))
- __fsnotify_update_child_dentry_flags(p_inode);
- else if (p_inode->i_fsnotify_mask & mask) {
- /* we are notifying a parent so come up with the new mask which
- * specifies these are events which came from a child. */
- mask |= FS_EVENT_ON_CHILD;
-
- if (path)
- ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
- dentry->d_name.name, 0);
- else
- ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
- dentry->d_name.name, 0);
- }
-
- dput(parent);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(__fsnotify_parent);
-
-static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
- struct fsnotify_mark *inode_mark,
- struct fsnotify_mark *vfsmount_mark,
- __u32 mask, void *data,
- int data_is, u32 cookie,
- const unsigned char *file_name,
- struct fsnotify_event **event)
-{
- struct fsnotify_group *group = NULL;
- __u32 inode_test_mask = 0;
- __u32 vfsmount_test_mask = 0;
-
- if (unlikely(!inode_mark && !vfsmount_mark)) {
- BUG();
- return 0;
- }
-
- /* clear ignored on inode modification */
- if (mask & FS_MODIFY) {
- if (inode_mark &&
- !(inode_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
- inode_mark->ignored_mask = 0;
- if (vfsmount_mark &&
- !(vfsmount_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
- vfsmount_mark->ignored_mask = 0;
- }
-
- /* does the inode mark tell us to do something? */
- if (inode_mark) {
- group = inode_mark->group;
- inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
- inode_test_mask &= inode_mark->mask;
- inode_test_mask &= ~inode_mark->ignored_mask;
- }
-
- /* does the vfsmount_mark tell us to do something? */
- if (vfsmount_mark) {
- vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
- group = vfsmount_mark->group;
- vfsmount_test_mask &= vfsmount_mark->mask;
- vfsmount_test_mask &= ~vfsmount_mark->ignored_mask;
- if (inode_mark)
- vfsmount_test_mask &= ~inode_mark->ignored_mask;
- }
-
- pr_debug("%s: group=%p to_tell=%p mnt=%p mask=%x inode_mark=%p"
- " inode_test_mask=%x vfsmount_mark=%p vfsmount_test_mask=%x"
- " data=%p data_is=%d cookie=%d event=%p\n",
- __func__, group, to_tell, mnt, mask, inode_mark,
- inode_test_mask, vfsmount_mark, vfsmount_test_mask, data,
- data_is, cookie, *event);
-
- if (!inode_test_mask && !vfsmount_test_mask)
- return 0;
-
- if (group->ops->should_send_event(group, to_tell, inode_mark,
- vfsmount_mark, mask, data,
- data_is) == false)
- return 0;
-
- if (!*event) {
- *event = fsnotify_create_event(to_tell, mask, data,
- data_is, file_name,
- cookie, GFP_KERNEL);
- if (!*event)
- return -ENOMEM;
- }
- return group->ops->handle_event(group, inode_mark, vfsmount_mark, *event);
-}
-
-/*
- * This is the main call to fsnotify. The VFS calls into hook specific functions
- * in linux/fsnotify.h. Those functions then in turn call here. Here will call
- * out to all of the registered fsnotify_group. Those groups can then use the
- * notification event in whatever means they feel necessary.
- */
-int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
- const unsigned char *file_name, u32 cookie)
-{
- struct hlist_node *inode_node = NULL, *vfsmount_node = NULL;
- struct fsnotify_mark *inode_mark = NULL, *vfsmount_mark = NULL;
- struct fsnotify_group *inode_group, *vfsmount_group;
- struct fsnotify_event *event = NULL;
- struct mount *mnt;
- int idx, ret = 0;
- /* global tests shouldn't care about events on child only the specific event */
- __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
-
- if (data_is == FSNOTIFY_EVENT_PATH)
- mnt = real_mount(((struct path *)data)->mnt);
- else
- mnt = NULL;
-
- /*
- * if this is a modify event we may need to clear the ignored masks
- * otherwise return if neither the inode nor the vfsmount care about
- * this type of event.
- */
- if (!(mask & FS_MODIFY) &&
- !(test_mask & to_tell->i_fsnotify_mask) &&
- !(mnt && test_mask & mnt->mnt_fsnotify_mask))
- return 0;
-
- idx = srcu_read_lock(&fsnotify_mark_srcu);
-
- if ((mask & FS_MODIFY) ||
- (test_mask & to_tell->i_fsnotify_mask))
- inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
- &fsnotify_mark_srcu);
-
- if (mnt && ((mask & FS_MODIFY) ||
- (test_mask & mnt->mnt_fsnotify_mask))) {
- vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
- &fsnotify_mark_srcu);
- inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
- &fsnotify_mark_srcu);
- }
-
- while (inode_node || vfsmount_node) {
- inode_group = vfsmount_group = NULL;
-
- if (inode_node) {
- inode_mark = hlist_entry(srcu_dereference(inode_node, &fsnotify_mark_srcu),
- struct fsnotify_mark, i.i_list);
- inode_group = inode_mark->group;
- }
-
- if (vfsmount_node) {
- vfsmount_mark = hlist_entry(srcu_dereference(vfsmount_node, &fsnotify_mark_srcu),
- struct fsnotify_mark, m.m_list);
- vfsmount_group = vfsmount_mark->group;
- }
-
- if (inode_group > vfsmount_group) {
- /* handle inode */
- ret = send_to_group(to_tell, NULL, inode_mark, NULL, mask, data,
- data_is, cookie, file_name, &event);
- /* we didn't use the vfsmount_mark */
- vfsmount_group = NULL;
- } else if (vfsmount_group > inode_group) {
- ret = send_to_group(to_tell, &mnt->mnt, NULL, vfsmount_mark, mask, data,
- data_is, cookie, file_name, &event);
- inode_group = NULL;
- } else {
- ret = send_to_group(to_tell, &mnt->mnt, inode_mark, vfsmount_mark,
- mask, data, data_is, cookie, file_name,
- &event);
- }
-
- if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
- goto out;
-
- if (inode_group)
- inode_node = srcu_dereference(inode_node->next,
- &fsnotify_mark_srcu);
- if (vfsmount_group)
- vfsmount_node = srcu_dereference(vfsmount_node->next,
- &fsnotify_mark_srcu);
- }
- ret = 0;
-out:
- srcu_read_unlock(&fsnotify_mark_srcu, idx);
- /*
- * fsnotify_create_event() took a reference so the event can't be cleaned
- * up while we are still trying to add it to lists, drop that one.
- */
- if (event)
- fsnotify_put_event(event);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(fsnotify);
-
-static __init int fsnotify_init(void)
-{
- int ret;
-
- BUG_ON(hweight32(ALL_FSNOTIFY_EVENTS) != 23);
-
- ret = init_srcu_struct(&fsnotify_mark_srcu);
- if (ret)
- panic("initializing fsnotify_mark_srcu");
-
- return 0;
-}
-core_initcall(fsnotify_init);