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fsnotify: rework ignored mark flushing 

currently ignored_mark clearing is done in a seperate list traversal
before the actual list traversal to send events.  There is no need for
this.  Do them at the same time.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2010-07-28 10:18:39 -04:00
parent 02436668d9
commit 84a5b68e8d
1 changed files with 11 additions and 49 deletions
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60
fs/notify/fsnotify.c
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@ -140,36 +140,6 @@ void __fsnotify_parent(struct file *file, struct dentry *dentry, __u32 mask)
}
EXPORT_SYMBOL_GPL(__fsnotify_parent);
void __fsnotify_flush_ignored_mask(struct inode *inode, void *data, int data_is)
{
struct fsnotify_mark *mark;
struct hlist_node *node;
int idx;
idx = srcu_read_lock(&fsnotify_mark_srcu);
if (!hlist_empty(&inode->i_fsnotify_marks)) {
hlist_for_each_entry_rcu(mark, node, &inode->i_fsnotify_marks, i.i_list) {
if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
mark->ignored_mask = 0;
}
}
if (data_is == FSNOTIFY_EVENT_FILE) {
struct vfsmount *mnt;
mnt = ((struct file *)data)->f_path.mnt;
if (mnt && !hlist_empty(&mnt->mnt_fsnotify_marks)) {
hlist_for_each_entry_rcu(mark, node, &mnt->mnt_fsnotify_marks, m.m_list) {
if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
mark->ignored_mask = 0;
}
}
}
srcu_read_unlock(&fsnotify_mark_srcu, idx);
}
static int send_to_group(struct fsnotify_group *group, struct inode *to_tell,
struct vfsmount *mnt, struct fsnotify_mark *mark,
__u32 mask, void *data, int data_is, u32 cookie,
@ -193,14 +163,6 @@ static int send_to_group(struct fsnotify_group *group, struct inode *to_tell,
return group->ops->handle_event(group, mark, *event);
}
static bool needed_by_vfsmount(__u32 test_mask, struct vfsmount *mnt)
{
if (!mnt)
return false;
return (test_mask & mnt->mnt_fsnotify_mask);
}
/*
* 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
@ -219,26 +181,21 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
/* global tests shouldn't care about events on child only the specific event */
__u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
if (mask & FS_MODIFY)
__fsnotify_flush_ignored_mask(to_tell, data, data_is);
if (data_is == FSNOTIFY_EVENT_FILE)
mnt = ((struct file *)data)->f_path.mnt;
/* if this inode's directed listeners don't care and nothing on the vfsmount
* listeners list cares, nothing to do */
if (!(test_mask & to_tell->i_fsnotify_mask) &&
!needed_by_vfsmount(test_mask, mnt))
return 0;
idx = srcu_read_lock(&fsnotify_mark_srcu);
if (test_mask & to_tell->i_fsnotify_mask) {
if ((test_mask & to_tell->i_fsnotify_mask) || (mask & FS_MODIFY)) {
hlist_for_each_entry_rcu(mark, node, &to_tell->i_fsnotify_marks, i.i_list) {
pr_debug("%s: inode_loop: mark=%p mark->mask=%x mark->ignored_mask=%x\n",
__func__, mark, mark->mask, mark->ignored_mask);
if ((mask & FS_MODIFY) &&
!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
mark->ignored_mask = 0;
if (test_mask & mark->mask & ~mark->ignored_mask) {
group = mark->group;
if (!group)
@ -252,12 +209,17 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
}
}
if (mnt && (test_mask & mnt->mnt_fsnotify_mask)) {
if (mnt && ((test_mask & mnt->mnt_fsnotify_mask) ||
(mask & FS_MODIFY))) {
hlist_for_each_entry_rcu(mark, node, &mnt->mnt_fsnotify_marks, m.m_list) {
pr_debug("%s: mnt_loop: mark=%p mark->mask=%x mark->ignored_mask=%x\n",
__func__, mark, mark->mask, mark->ignored_mask);
if ((mask & FS_MODIFY) &&
!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))
mark->ignored_mask = 0;
if (test_mask & mark->mask & ~mark->ignored_mask) {
group = mark->group;
if (!group)