fsnotify: remove mark->free_list
Free list is used when all marks on given inode / mount should be destroyed when inode / mount is going away. However we can free all of the marks without using a special list with some care. Signed-off-by: Jan Kara <jack@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -26,7 +26,6 @@
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#include <linux/fsnotify_backend.h>
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#include "fsnotify.h"
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#include "../mount.h"
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/*
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* Clear all of the marks on an inode when it is being evicted from core
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@ -6,6 +6,8 @@
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#include <linux/srcu.h>
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#include <linux/types.h>
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#include "../mount.h"
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/* destroy all events sitting in this groups notification queue */
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extern void fsnotify_flush_notify(struct fsnotify_group *group);
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@ -38,15 +40,22 @@ extern int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
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extern void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark);
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/* inode specific destruction of a mark */
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extern void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
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/* Destroy all marks in the given list */
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extern void fsnotify_destroy_marks(struct list_head *to_free);
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/* Find mark belonging to given group in the list of marks */
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extern struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head,
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struct fsnotify_group *group);
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/* run the list of all marks associated with inode and flag them to be freed */
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extern void fsnotify_clear_marks_by_inode(struct inode *inode);
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/* run the list of all marks associated with vfsmount and flag them to be freed */
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extern void fsnotify_clear_marks_by_mount(struct vfsmount *mnt);
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/* Destroy all marks in the given list protected by 'lock' */
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extern void fsnotify_destroy_marks(struct hlist_head *head, spinlock_t *lock);
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/* run the list of all marks associated with inode and destroy them */
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static inline void fsnotify_clear_marks_by_inode(struct inode *inode)
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{
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fsnotify_destroy_marks(&inode->i_fsnotify_marks, &inode->i_lock);
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}
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/* run the list of all marks associated with vfsmount and destroy them */
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static inline void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
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{
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fsnotify_destroy_marks(&real_mount(mnt)->mnt_fsnotify_marks,
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&mnt->mnt_root->d_lock);
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}
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/*
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* update the dentry->d_flags of all of inode's children to indicate if inode cares
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* about events that happen to its children.
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@ -64,26 +64,6 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
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spin_unlock(&inode->i_lock);
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}
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/*
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* Given an inode, destroy all of the marks associated with that inode.
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*/
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void fsnotify_clear_marks_by_inode(struct inode *inode)
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{
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struct fsnotify_mark *mark;
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struct hlist_node *n;
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LIST_HEAD(free_list);
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spin_lock(&inode->i_lock);
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hlist_for_each_entry_safe(mark, n, &inode->i_fsnotify_marks, obj_list) {
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list_add(&mark->free_list, &free_list);
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hlist_del_init_rcu(&mark->obj_list);
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fsnotify_get_mark(mark);
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}
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spin_unlock(&inode->i_lock);
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fsnotify_destroy_marks(&free_list);
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}
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/*
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* Given a group clear all of the inode marks associated with that group.
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*/
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@ -203,24 +203,34 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark,
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mutex_unlock(&group->mark_mutex);
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}
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/*
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* Destroy all marks in the given list. The marks must be already detached from
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* the original inode / vfsmount.
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*/
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void fsnotify_destroy_marks(struct list_head *to_free)
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void fsnotify_destroy_marks(struct hlist_head *head, spinlock_t *lock)
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{
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struct fsnotify_mark *mark, *lmark;
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struct fsnotify_group *group;
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struct fsnotify_mark *mark;
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list_for_each_entry_safe(mark, lmark, to_free, free_list) {
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spin_lock(&mark->lock);
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fsnotify_get_group(mark->group);
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group = mark->group;
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spin_unlock(&mark->lock);
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fsnotify_destroy_mark(mark, group);
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while (1) {
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/*
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* We have to be careful since we can race with e.g.
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* fsnotify_clear_marks_by_group() and once we drop 'lock',
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* mark can get removed from the obj_list and destroyed. But
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* we are holding mark reference so mark cannot be freed and
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* calling fsnotify_destroy_mark() more than once is fine.
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*/
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spin_lock(lock);
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if (hlist_empty(head)) {
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spin_unlock(lock);
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break;
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}
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mark = hlist_entry(head->first, struct fsnotify_mark, obj_list);
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/*
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* We don't update i_fsnotify_mask / mnt_fsnotify_mask here
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* since inode / mount is going away anyway. So just remove
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* mark from the list.
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*/
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hlist_del_init_rcu(&mark->obj_list);
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fsnotify_get_mark(mark);
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spin_unlock(lock);
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fsnotify_destroy_mark(mark, mark->group);
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fsnotify_put_mark(mark);
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fsnotify_put_group(group);
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}
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}
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@ -28,25 +28,6 @@
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#include <linux/fsnotify_backend.h>
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#include "fsnotify.h"
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#include "../mount.h"
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void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
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{
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struct fsnotify_mark *mark;
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struct hlist_node *n;
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struct mount *m = real_mount(mnt);
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LIST_HEAD(free_list);
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spin_lock(&mnt->mnt_root->d_lock);
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hlist_for_each_entry_safe(mark, n, &m->mnt_fsnotify_marks, obj_list) {
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list_add(&mark->free_list, &free_list);
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hlist_del_init_rcu(&mark->obj_list);
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fsnotify_get_mark(mark);
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}
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spin_unlock(&mnt->mnt_root->d_lock);
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fsnotify_destroy_marks(&free_list);
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}
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void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
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{
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@ -225,8 +225,6 @@ struct fsnotify_mark {
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spinlock_t lock;
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/* List of marks for inode / vfsmount [obj_lock] */
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struct hlist_node obj_list;
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/* tmp list used when freeing this mark */
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struct list_head free_list;
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union { /* Object pointer [mark->lock, group->mark_mutex] */
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struct inode *inode; /* inode this mark is associated with */
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struct vfsmount *mnt; /* vfsmount this mark is associated with */
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