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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/notify/fsnotify.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
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.c | 311 |
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); |