forked from luck/tmp_suning_uos_patched
7131485a93
currently all of the notification systems implemented select which inodes they care about and receive messages only about those inodes (or the children of those inodes.) This patch begins to flesh out fsnotify support for the concept of listeners that want to hear notification for an inode accessed below a given monut point. This patch implements a second list of fsnotify groups to hold these types of groups and a second global mask to hold the events of interest for this type of group. The reason we want a second group list and mask is because the inode based notification should_send_event support which makes each group look for a mark on the given inode. With one nfsmount listener that means that every group would have to take the inode->i_lock, look for their mark, not find one, and return for every operation. By seperating vfsmount from inode listeners only when there is a inode listener will the inode groups have to look for their mark and take the inode lock. vfsmount listeners will have to grab the lock and look for a mark but there should be fewer of them, and one vfsmount listener won't cause the i_lock to be grabbed and released for every fsnotify group on every io operation. Signed-off-by: Eric Paris <eparis@redhat.com>
43 lines
1.7 KiB
C
43 lines
1.7 KiB
C
#ifndef __FS_NOTIFY_FSNOTIFY_H_
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#define __FS_NOTIFY_FSNOTIFY_H_
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#include <linux/list.h>
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#include <linux/fsnotify.h>
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#include <linux/srcu.h>
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#include <linux/types.h>
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/* protects reads of fsnotify_groups */
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extern struct srcu_struct fsnotify_grp_srcu;
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/* all groups which receive inode fsnotify events */
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extern struct list_head fsnotify_inode_groups;
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/* all groups which receive vfsmount fsnotify events */
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extern struct list_head fsnotify_vfsmount_groups;
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/* all bitwise OR of all event types (FS_*) for all fsnotify_inode_groups */
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extern __u32 fsnotify_inode_mask;
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/* all bitwise OR of all event types (FS_*) for all fsnotify_vfsmount_groups */
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extern __u32 fsnotify_vfsmount_mask;
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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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/* add a group to the inode group list */
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extern void fsnotify_add_inode_group(struct fsnotify_group *group);
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/* add a group to the vfsmount group list */
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extern void fsnotify_add_vfsmount_group(struct fsnotify_group *group);
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/* final kfree of a group */
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extern void fsnotify_final_destroy_group(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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/*
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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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*/
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extern void __fsnotify_update_child_dentry_flags(struct inode *inode);
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/* allocate and destroy and event holder to attach events to notification/access queues */
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extern struct fsnotify_event_holder *fsnotify_alloc_event_holder(void);
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extern void fsnotify_destroy_event_holder(struct fsnotify_event_holder *holder);
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#endif /* __FS_NOTIFY_FSNOTIFY_H_ */
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