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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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abc77577a6
fanotify wants to drop fsnotify_mark_srcu lock when waiting for response from userspace so that the whole notification subsystem is not blocked during that time. This patch provides a framework for safely getting mark reference for a mark found in the object list which pins the mark in that list. We can then drop fsnotify_mark_srcu, wait for userspace response and then safely continue iteration of the object list once we reaquire fsnotify_mark_srcu. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
59 lines
2.1 KiB
C
59 lines
2.1 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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#include "../mount.h"
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struct fsnotify_iter_info {
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struct fsnotify_mark *inode_mark;
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struct fsnotify_mark *vfsmount_mark;
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int srcu_idx;
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};
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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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/* protects reads of inode and vfsmount marks list */
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extern struct srcu_struct fsnotify_mark_srcu;
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/* compare two groups for sorting of marks lists */
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extern int fsnotify_compare_groups(struct fsnotify_group *a,
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struct fsnotify_group *b);
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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(
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struct fsnotify_mark_connector __rcu **connp,
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struct fsnotify_group *group);
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/* Destroy all marks connected via given connector */
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extern void fsnotify_destroy_marks(struct fsnotify_mark_connector __rcu **connp);
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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);
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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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}
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/* prepare for freeing all marks associated with given group */
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extern void fsnotify_detach_group_marks(struct fsnotify_group *group);
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/* Wait until all marks queued for destruction are destroyed */
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extern void fsnotify_wait_marks_destroyed(void);
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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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