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Commit 841bdc10 authored by Eric Paris's avatar Eric Paris
Browse files

fsnotify: rename mark_entry to just mark 



previously I used mark_entry when talking about marks on inodes.  The
_entry is pretty useless.  Just use "mark" instead.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent d0775441

fs/notify/group.c

+3 −3
Original line number Diff line number Diff line
@@ -74,11 +74,11 @@ void fsnotify_recalc_group_mask(struct fsnotify_group *group) 
{

	__u32 mask = 0;

	__u32 old_mask = group->mask;

	struct fsnotify_mark *entry;

	struct fsnotify_mark *mark;



	spin_lock(&group->mark_lock);

	list_for_each_entry(entry, &group->marks_list, g_list)

		mask |= entry->mask;

	list_for_each_entry(mark, &group->marks_list, g_list)

		mask |= mark->mask;

	spin_unlock(&group->mark_lock);



	group->mask = mask;

fs/notify/inode_mark.c

+74 −74
Original line number Diff line number Diff line
@@ -30,21 +30,21 @@ 
 * There are 3 spinlocks involved with fsnotify inode marks and they MUST

 * be taken in order as follows:

 *

 * entry->lock

 * mark->lock

 * group->mark_lock

 * inode->i_lock

 *

 * entry->lock protects 2 things, entry->group and entry->inode.  You must hold

 * mark->lock protects 2 things, mark->group and mark->inode.  You must hold

 * that lock to dereference either of these things (they could be NULL even with

 * the lock)

 *

 * group->mark_lock protects the marks_list anchored inside a given group

 * and each entry is hooked via the g_list.  It also sorta protects the

 * and each mark is hooked via the g_list.  It also sorta protects the

 * free_g_list, which when used is anchored by a private list on the stack of the

 * task which held the group->mark_lock.

 *

 * inode->i_lock protects the i_fsnotify_marks list anchored inside a

 * given inode and each entry is hooked via the i_list. (and sorta the

 * given inode and each mark is hooked via the i_list. (and sorta the

 * free_i_list)

 *

 *
@@ -95,15 +95,15 @@ 
#include <linux/fsnotify_backend.h>

#include "fsnotify.h"



void fsnotify_get_mark(struct fsnotify_mark *entry)

void fsnotify_get_mark(struct fsnotify_mark *mark)

{

	atomic_inc(&entry->refcnt);

	atomic_inc(&mark->refcnt);

}



void fsnotify_put_mark(struct fsnotify_mark *entry)

void fsnotify_put_mark(struct fsnotify_mark *mark)

{

	if (atomic_dec_and_test(&entry->refcnt))

		entry->free_mark(entry);

	if (atomic_dec_and_test(&mark->refcnt))

		mark->free_mark(mark);

}



/*
@@ -111,14 +111,14 @@ void fsnotify_put_mark(struct fsnotify_mark *entry) 
 */

static void fsnotify_recalc_inode_mask_locked(struct inode *inode)

{

	struct fsnotify_mark *entry;

	struct fsnotify_mark *mark;

	struct hlist_node *pos;

	__u32 new_mask = 0;



	assert_spin_locked(&inode->i_lock);



	hlist_for_each_entry(entry, pos, &inode->i_fsnotify_marks, i.i_list)

		new_mask |= entry->mask;

	hlist_for_each_entry(mark, pos, &inode->i_fsnotify_marks, i.i_list)

		new_mask |= mark->mask;

	inode->i_fsnotify_mask = new_mask;

}
@@ -138,40 +138,40 @@ void fsnotify_recalc_inode_mask(struct inode *inode) 
/*

 * Any time a mark is getting freed we end up here.

 * The caller had better be holding a reference to this mark so we don't actually

 * do the final put under the entry->lock

 * do the final put under the mark->lock

 */

void fsnotify_destroy_mark(struct fsnotify_mark *entry)

void fsnotify_destroy_mark(struct fsnotify_mark *mark)

{

	struct fsnotify_group *group;

	struct inode *inode;



	spin_lock(&entry->lock);

	spin_lock(&mark->lock);



	group = entry->group;

	inode = entry->i.inode;

	group = mark->group;

	inode = mark->i.inode;



	BUG_ON(group && !inode);

	BUG_ON(!group && inode);



	/* if !group something else already marked this to die */

	if (!group) {

		spin_unlock(&entry->lock);

		spin_unlock(&mark->lock);

		return;

	}



	/* 1 from caller and 1 for being on i_list/g_list */

	BUG_ON(atomic_read(&entry->refcnt) < 2);

	BUG_ON(atomic_read(&mark->refcnt) < 2);



	spin_lock(&group->mark_lock);

	spin_lock(&inode->i_lock);



	hlist_del_init(&entry->i.i_list);

	entry->i.inode = NULL;

	hlist_del_init(&mark->i.i_list);

	mark->i.inode = NULL;



	list_del_init(&entry->g_list);

	entry->group = NULL;

	list_del_init(&mark->g_list);

	mark->group = NULL;



	fsnotify_put_mark(entry); /* for i_list and g_list */

	fsnotify_put_mark(mark); /* for i_list and g_list */



	/*

	 * this mark is now off the inode->i_fsnotify_marks list and we
@@ -182,21 +182,21 @@ void fsnotify_destroy_mark(struct fsnotify_mark *entry) 


	spin_unlock(&inode->i_lock);

	spin_unlock(&group->mark_lock);

	spin_unlock(&entry->lock);

	spin_unlock(&mark->lock);



	/*

	 * Some groups like to know that marks are being freed.  This is a

	 * callback to the group function to let it know that this entry

	 * callback to the group function to let it know that this mark

	 * is being freed.

	 */

	if (group->ops->freeing_mark)

		group->ops->freeing_mark(entry, group);

		group->ops->freeing_mark(mark, group);



	/*

	 * __fsnotify_update_child_dentry_flags(inode);

	 *

	 * I really want to call that, but we can't, we have no idea if the inode

	 * still exists the second we drop the entry->lock.

	 * still exists the second we drop the mark->lock.

	 *

	 * The next time an event arrive to this inode from one of it's children

	 * __fsnotify_parent will see that the inode doesn't care about it's
@@ -221,20 +221,20 @@ void fsnotify_destroy_mark(struct fsnotify_mark *entry) 
 */

void fsnotify_clear_marks_by_group(struct fsnotify_group *group)

{

	struct fsnotify_mark *lentry, *entry;

	struct fsnotify_mark *lmark, *mark;

	LIST_HEAD(free_list);



	spin_lock(&group->mark_lock);

	list_for_each_entry_safe(entry, lentry, &group->marks_list, g_list) {

		list_add(&entry->free_g_list, &free_list);

		list_del_init(&entry->g_list);

		fsnotify_get_mark(entry);

	list_for_each_entry_safe(mark, lmark, &group->marks_list, g_list) {

		list_add(&mark->free_g_list, &free_list);

		list_del_init(&mark->g_list);

		fsnotify_get_mark(mark);

	}

	spin_unlock(&group->mark_lock);



	list_for_each_entry_safe(entry, lentry, &free_list, free_g_list) {

		fsnotify_destroy_mark(entry);

		fsnotify_put_mark(entry);

	list_for_each_entry_safe(mark, lmark, &free_list, free_g_list) {

		fsnotify_destroy_mark(mark);

		fsnotify_put_mark(mark);

	}

}
@@ -243,21 +243,21 @@ void fsnotify_clear_marks_by_group(struct fsnotify_group *group) 
 */

void fsnotify_clear_marks_by_inode(struct inode *inode)

{

	struct fsnotify_mark *entry, *lentry;

	struct fsnotify_mark *mark, *lmark;

	struct hlist_node *pos, *n;

	LIST_HEAD(free_list);



	spin_lock(&inode->i_lock);

	hlist_for_each_entry_safe(entry, pos, n, &inode->i_fsnotify_marks, i.i_list) {

		list_add(&entry->i.free_i_list, &free_list);

		hlist_del_init(&entry->i.i_list);

		fsnotify_get_mark(entry);

	hlist_for_each_entry_safe(mark, pos, n, &inode->i_fsnotify_marks, i.i_list) {

		list_add(&mark->i.free_i_list, &free_list);

		hlist_del_init(&mark->i.i_list);

		fsnotify_get_mark(mark);

	}

	spin_unlock(&inode->i_lock);



	list_for_each_entry_safe(entry, lentry, &free_list, i.free_i_list) {

		fsnotify_destroy_mark(entry);

		fsnotify_put_mark(entry);

	list_for_each_entry_safe(mark, lmark, &free_list, i.free_i_list) {

		fsnotify_destroy_mark(mark);

		fsnotify_put_mark(mark);

	}

}
@@ -268,15 +268,15 @@ void fsnotify_clear_marks_by_inode(struct inode *inode) 
struct fsnotify_mark *fsnotify_find_mark(struct fsnotify_group *group,

					 struct inode *inode)

{

	struct fsnotify_mark *entry;

	struct fsnotify_mark *mark;

	struct hlist_node *pos;



	assert_spin_locked(&inode->i_lock);



	hlist_for_each_entry(entry, pos, &inode->i_fsnotify_marks, i.i_list) {

		if (entry->group == group) {

			fsnotify_get_mark(entry);

			return entry;

	hlist_for_each_entry(mark, pos, &inode->i_fsnotify_marks, i.i_list) {

		if (mark->group == group) {

			fsnotify_get_mark(mark);

			return mark;

		}

	}

	return NULL;
@@ -294,35 +294,35 @@ void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *ol 
/*

 * Nothing fancy, just initialize lists and locks and counters.

 */

void fsnotify_init_mark(struct fsnotify_mark *entry,

			void (*free_mark)(struct fsnotify_mark *entry))

void fsnotify_init_mark(struct fsnotify_mark *mark,

			void (*free_mark)(struct fsnotify_mark *mark))

{

	spin_lock_init(&entry->lock);

	atomic_set(&entry->refcnt, 1);

	INIT_HLIST_NODE(&entry->i.i_list);

	entry->group = NULL;

	entry->mask = 0;

	entry->i.inode = NULL;

	entry->free_mark = free_mark;

	spin_lock_init(&mark->lock);

	atomic_set(&mark->refcnt, 1);

	INIT_HLIST_NODE(&mark->i.i_list);

	mark->group = NULL;

	mark->mask = 0;

	mark->i.inode = NULL;

	mark->free_mark = free_mark;

}



/*

 * Attach an initialized mark entry to a given group and inode.

 * Attach an initialized mark mark to a given group and inode.

 * These marks may be used for the fsnotify backend to determine which

 * event types should be delivered to which group and for which inodes.

 */

int fsnotify_add_mark(struct fsnotify_mark *entry,

int fsnotify_add_mark(struct fsnotify_mark *mark,

		      struct fsnotify_group *group, struct inode *inode,

		      int allow_dups)

{

	struct fsnotify_mark *lentry = NULL;

	struct fsnotify_mark *lmark = NULL;

	int ret = 0;



	inode = igrab(inode);

	if (unlikely(!inode))

		return -EINVAL;



	entry->flags = FSNOTIFY_MARK_FLAG_INODE;

	mark->flags = FSNOTIFY_MARK_FLAG_INODE;



	/*

	 * if this group isn't being testing for inode type events we need
@@ -340,24 +340,24 @@ int fsnotify_add_mark(struct fsnotify_mark *entry, 


	/*

	 * LOCKING ORDER!!!!

	 * entry->lock

	 * mark->lock

	 * group->mark_lock

	 * inode->i_lock

	 */

	spin_lock(&entry->lock);

	spin_lock(&mark->lock);

	spin_lock(&group->mark_lock);

	spin_lock(&inode->i_lock);



	if (!allow_dups)

		lentry = fsnotify_find_mark(group, inode);

	if (!lentry) {

		entry->group = group;

		entry->i.inode = inode;

		lmark = fsnotify_find_mark(group, inode);

	if (!lmark) {

		mark->group = group;

		mark->i.inode = inode;



		hlist_add_head(&entry->i.i_list, &inode->i_fsnotify_marks);

		list_add(&entry->g_list, &group->marks_list);

		hlist_add_head(&mark->i.i_list, &inode->i_fsnotify_marks);

		list_add(&mark->g_list, &group->marks_list);



		fsnotify_get_mark(entry); /* for i_list and g_list */

		fsnotify_get_mark(mark); /* for i_list and g_list */



		atomic_inc(&group->num_marks);
@@ -366,12 +366,12 @@ int fsnotify_add_mark(struct fsnotify_mark *entry, 


	spin_unlock(&inode->i_lock);

	spin_unlock(&group->mark_lock);

	spin_unlock(&entry->lock);

	spin_unlock(&mark->lock);



	if (lentry) {

	if (lmark) {

		ret = -EEXIST;

		iput(inode);

		fsnotify_put_mark(lentry);

		fsnotify_put_mark(lmark);

	} else {

		__fsnotify_update_child_dentry_flags(inode);

	}

include/linux/fsnotify_backend.h

+13 −13
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ struct fsnotify_ops { 
				  int data_type);

	int (*handle_event)(struct fsnotify_group *group, struct fsnotify_event *event);

	void (*free_group_priv)(struct fsnotify_group *group);

	void (*freeing_mark)(struct fsnotify_mark *entry, struct fsnotify_group *group);

	void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);

	void (*free_event_priv)(struct fsnotify_event_private_data *priv);

};
@@ -135,7 +135,7 @@ struct fsnotify_group { 


	/* stores all fastpath marks assoc with this group so they can be cleaned on unregister */

	spinlock_t mark_lock;		/* protect marks_list */

	atomic_t num_marks;		/* 1 for each mark entry and 1 for not being

	atomic_t num_marks;		/* 1 for each mark and 1 for not being

					 * past the point of no return when freeing

					 * a group */

	struct list_head marks_list;	/* all inode marks for this group */
@@ -229,7 +229,7 @@ struct fsnotify_event { 
 * Inode specific fields in an fsnotify_mark

 */

struct fsnotify_inode_mark {

	struct inode *inode;		/* inode this entry is associated with */

	struct inode *inode;		/* inode this mark is associated with */

	struct hlist_node i_list;	/* list of marks by inode->i_fsnotify_marks */

	struct list_head free_i_list;	/* tmp list used when freeing this mark */

};
@@ -238,13 +238,13 @@ struct fsnotify_inode_mark { 
 * Mount point specific fields in an fsnotify_mark

 */

struct fsnotify_vfsmount_mark {

	struct vfsmount *mnt;		/* inode this entry is associated with */

	struct vfsmount *mnt;		/* vfsmount this mark is associated with */

	struct hlist_node m_list;	/* list of marks by inode->i_fsnotify_marks */

	struct list_head free_m_list;	/* tmp list used when freeing this mark */

};



/*

 * a mark is simply an entry attached to an in core inode which allows an

 * a mark is simply an object attached to an in core inode which allows an

 * fsnotify listener to indicate they are either no longer interested in events

 * of a type matching mask or only interested in those events.

 *
@@ -254,11 +254,11 @@ struct fsnotify_vfsmount_mark { 
 * inode eviction or modification.

 */

struct fsnotify_mark {

	__u32 mask;			/* mask this mark entry is for */

	__u32 mask;			/* mask this mark is for */

	/* we hold ref for each i_list and g_list.  also one ref for each 'thing'

	 * in kernel that found and may be using this mark. */

	atomic_t refcnt;		/* active things looking at this mark */

	struct fsnotify_group *group;	/* group this mark entry is for */

	struct fsnotify_group *group;	/* group this mark is for */

	struct list_head g_list;	/* list of marks by group->i_fsnotify_marks */

	spinlock_t lock;		/* protect group and inode */

	union {
@@ -269,7 +269,7 @@ struct fsnotify_mark { 
#define FSNOTIFY_MARK_FLAG_INODE	0x01

#define FSNOTIFY_MARK_FLAG_VFSMOUNT	0x02

	unsigned int flags;		/* vfsmount or inode mark? */

	void (*free_mark)(struct fsnotify_mark *entry); /* called on final put+free */

	void (*free_mark)(struct fsnotify_mark *mark); /* called on final put+free */

};



#ifdef CONFIG_FSNOTIFY
@@ -361,19 +361,19 @@ extern struct fsnotify_event *fsnotify_remove_notify_event(struct fsnotify_group 


/* run all marks associated with an inode and update inode->i_fsnotify_mask */

extern void fsnotify_recalc_inode_mask(struct inode *inode);

extern void fsnotify_init_mark(struct fsnotify_mark *entry, void (*free_mark)(struct fsnotify_mark *entry));

extern void fsnotify_init_mark(struct fsnotify_mark *mark, void (*free_mark)(struct fsnotify_mark *mark));

/* find (and take a reference) to a mark associated with group and inode */

extern struct fsnotify_mark *fsnotify_find_mark(struct fsnotify_group *group, struct inode *inode);

/* copy the values from old into new */

extern void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old);

/* attach the mark to both the group and the inode */

extern int fsnotify_add_mark(struct fsnotify_mark *entry, struct fsnotify_group *group, struct inode *inode, int allow_dups);

extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group, struct inode *inode, int allow_dups);

/* given a mark, flag it to be freed when all references are dropped */

extern void fsnotify_destroy_mark(struct fsnotify_mark *entry);

extern void fsnotify_destroy_mark(struct fsnotify_mark *mark);

/* run all the marks in a group, and flag them to be freed */

extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group);

extern void fsnotify_get_mark(struct fsnotify_mark *entry);

extern void fsnotify_put_mark(struct fsnotify_mark *entry);

extern void fsnotify_get_mark(struct fsnotify_mark *mark);

extern void fsnotify_put_mark(struct fsnotify_mark *mark);

extern void fsnotify_unmount_inodes(struct list_head *list);



/* put here because inotify does some weird stuff when destroying watches */