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Commit ef5e2b78 authored by Eric Paris's avatar Eric Paris
Browse files

dnotify: rename mark_entry to mark 



nomenclature change.  Used to call things 'entries' but now we just call
them 'marks.'  Do those changes for dnotify.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 000285de

fs/notify/dnotify/dnotify.c

+85 −85
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ 
int dir_notify_enable __read_mostly = 1;



static struct kmem_cache *dnotify_struct_cache __read_mostly;

static struct kmem_cache *dnotify_mark_entry_cache __read_mostly;

static struct kmem_cache *dnotify_mark_cache __read_mostly;

static struct fsnotify_group *dnotify_group __read_mostly;

static DEFINE_MUTEX(dnotify_mark_mutex);
@@ -38,8 +38,8 @@ static DEFINE_MUTEX(dnotify_mark_mutex); 
 * is being watched by dnotify.  If multiple userspace applications are watching

 * the same directory with dnotify their information is chained in dn

 */

struct dnotify_mark_entry {

	struct fsnotify_mark fsn_entry;

struct dnotify_mark {

	struct fsnotify_mark fsn_mark;

	struct dnotify_struct *dn;

};
@@ -51,27 +51,27 @@ struct dnotify_mark_entry { 
 * it calls the fsnotify function so it can update the set of all events relevant

 * to this inode.

 */

static void dnotify_recalc_inode_mask(struct fsnotify_mark *entry)

static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)

{

	__u32 new_mask, old_mask;

	struct dnotify_struct *dn;

	struct dnotify_mark_entry *dnentry  = container_of(entry,

							   struct dnotify_mark_entry,

							   fsn_entry);

	struct dnotify_mark *dn_mark  = container_of(fsn_mark,

						     struct dnotify_mark,

						     fsn_mark);



	assert_spin_locked(&entry->lock);

	assert_spin_locked(&fsn_mark->lock);



	old_mask = entry->mask;

	old_mask = fsn_mark->mask;

	new_mask = 0;

	for (dn = dnentry->dn; dn != NULL; dn = dn->dn_next)

	for (dn = dn_mark->dn; dn != NULL; dn = dn->dn_next)

		new_mask |= (dn->dn_mask & ~FS_DN_MULTISHOT);

	entry->mask = new_mask;

	fsn_mark->mask = new_mask;



	if (old_mask == new_mask)

		return;



	if (entry->i.inode)

		fsnotify_recalc_inode_mask(entry->i.inode);

	if (fsn_mark->i.inode)

		fsnotify_recalc_inode_mask(fsn_mark->i.inode);

}



/*
@@ -85,8 +85,8 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *entry) 
static int dnotify_handle_event(struct fsnotify_group *group,

				struct fsnotify_event *event)

{

	struct fsnotify_mark *entry = NULL;

	struct dnotify_mark_entry *dnentry;

	struct fsnotify_mark *fsn_mark = NULL;

	struct dnotify_mark *dn_mark;

	struct inode *to_tell;

	struct dnotify_struct *dn;

	struct dnotify_struct **prev;
@@ -96,16 +96,16 @@ static int dnotify_handle_event(struct fsnotify_group *group, 
	to_tell = event->to_tell;



	spin_lock(&to_tell->i_lock);

	entry = fsnotify_find_mark(group, to_tell);

	fsn_mark = fsnotify_find_mark(group, to_tell);

	spin_unlock(&to_tell->i_lock);



	/* unlikely since we alreay passed dnotify_should_send_event() */

	if (unlikely(!entry))

	if (unlikely(!fsn_mark))

		return 0;

	dnentry = container_of(entry, struct dnotify_mark_entry, fsn_entry);

	dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);



	spin_lock(&entry->lock);

	prev = &dnentry->dn;

	spin_lock(&fsn_mark->lock);

	prev = &dn_mark->dn;

	while ((dn = *prev) != NULL) {

		if ((dn->dn_mask & test_mask) == 0) {

			prev = &dn->dn_next;
@@ -118,12 +118,12 @@ static int dnotify_handle_event(struct fsnotify_group *group, 
		else {

			*prev = dn->dn_next;

			kmem_cache_free(dnotify_struct_cache, dn);

			dnotify_recalc_inode_mask(entry);

			dnotify_recalc_inode_mask(fsn_mark);

		}

	}



	spin_unlock(&entry->lock);

	fsnotify_put_mark(entry);

	spin_unlock(&fsn_mark->lock);

	fsnotify_put_mark(fsn_mark);



	return 0;

}
@@ -136,7 +136,7 @@ static bool dnotify_should_send_event(struct fsnotify_group *group, 
				      struct inode *inode, struct vfsmount *mnt,

				      __u32 mask, void *data, int data_type)

{

	struct fsnotify_mark *entry;

	struct fsnotify_mark *fsn_mark;

	bool send;



	/* !dir_notify_enable should never get here, don't waste time checking
@@ -148,30 +148,30 @@ static bool dnotify_should_send_event(struct fsnotify_group *group, 
		return false;



	spin_lock(&inode->i_lock);

	entry = fsnotify_find_mark(group, inode);

	fsn_mark = fsnotify_find_mark(group, inode);

	spin_unlock(&inode->i_lock);



	/* no mark means no dnotify watch */

	if (!entry)

	if (!fsn_mark)

		return false;



	mask = (mask & ~FS_EVENT_ON_CHILD);

	send = (mask & entry->mask);

	send = (mask & fsn_mark->mask);



	fsnotify_put_mark(entry); /* matches fsnotify_find_mark */

	fsnotify_put_mark(fsn_mark); /* matches fsnotify_find_mark */



	return send;

}



static void dnotify_free_mark(struct fsnotify_mark *entry)

static void dnotify_free_mark(struct fsnotify_mark *fsn_mark)

{

	struct dnotify_mark_entry *dnentry = container_of(entry,

							  struct dnotify_mark_entry,

							  fsn_entry);

	struct dnotify_mark *dn_mark = container_of(fsn_mark,

						    struct dnotify_mark,

						    fsn_mark);



	BUG_ON(dnentry->dn);

	BUG_ON(dn_mark->dn);



	kmem_cache_free(dnotify_mark_entry_cache, dnentry);

	kmem_cache_free(dnotify_mark_cache, dn_mark);

}



static struct fsnotify_ops dnotify_fsnotify_ops = {
@@ -191,8 +191,8 @@ static struct fsnotify_ops dnotify_fsnotify_ops = { 
 */

void dnotify_flush(struct file *filp, fl_owner_t id)

{

	struct fsnotify_mark *entry;

	struct dnotify_mark_entry *dnentry;

	struct fsnotify_mark *fsn_mark;

	struct dnotify_mark *dn_mark;

	struct dnotify_struct *dn;

	struct dnotify_struct **prev;

	struct inode *inode;
@@ -202,37 +202,37 @@ void dnotify_flush(struct file *filp, fl_owner_t id) 
		return;



	spin_lock(&inode->i_lock);

	entry = fsnotify_find_mark(dnotify_group, inode);

	fsn_mark = fsnotify_find_mark(dnotify_group, inode);

	spin_unlock(&inode->i_lock);

	if (!entry)

	if (!fsn_mark)

		return;

	dnentry = container_of(entry, struct dnotify_mark_entry, fsn_entry);

	dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);



	mutex_lock(&dnotify_mark_mutex);



	spin_lock(&entry->lock);

	prev = &dnentry->dn;

	spin_lock(&fsn_mark->lock);

	prev = &dn_mark->dn;

	while ((dn = *prev) != NULL) {

		if ((dn->dn_owner == id) && (dn->dn_filp == filp)) {

			*prev = dn->dn_next;

			kmem_cache_free(dnotify_struct_cache, dn);

			dnotify_recalc_inode_mask(entry);

			dnotify_recalc_inode_mask(fsn_mark);

			break;

		}

		prev = &dn->dn_next;

	}



	spin_unlock(&entry->lock);

	spin_unlock(&fsn_mark->lock);



	/* nothing else could have found us thanks to the dnotify_mark_mutex */

	if (dnentry->dn == NULL)

		fsnotify_destroy_mark(entry);

	if (dn_mark->dn == NULL)

		fsnotify_destroy_mark(fsn_mark);



	fsnotify_recalc_group_mask(dnotify_group);



	mutex_unlock(&dnotify_mark_mutex);



	fsnotify_put_mark(entry);

	fsnotify_put_mark(fsn_mark);

}



/* this conversion is done only at watch creation */
@@ -264,12 +264,12 @@ static __u32 convert_arg(unsigned long arg) 
 * onto that mark.  This function either attaches the new dnotify_struct onto

 * that list, or it |= the mask onto an existing dnofiy_struct.

 */

static int attach_dn(struct dnotify_struct *dn, struct dnotify_mark_entry *dnentry,

static int attach_dn(struct dnotify_struct *dn, struct dnotify_mark *dn_mark,

		     fl_owner_t id, int fd, struct file *filp, __u32 mask)

{

	struct dnotify_struct *odn;



	odn = dnentry->dn;

	odn = dn_mark->dn;

	while (odn != NULL) {

		/* adding more events to existing dnofiy_struct? */

		if ((odn->dn_owner == id) && (odn->dn_filp == filp)) {
@@ -284,8 +284,8 @@ static int attach_dn(struct dnotify_struct *dn, struct dnotify_mark_entry *dnent 
	dn->dn_fd = fd;

	dn->dn_filp = filp;

	dn->dn_owner = id;

	dn->dn_next = dnentry->dn;

	dnentry->dn = dn;

	dn->dn_next = dn_mark->dn;

	dn_mark->dn = dn;



	return 0;

}
@@ -297,8 +297,8 @@ static int attach_dn(struct dnotify_struct *dn, struct dnotify_mark_entry *dnent 
 */

int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)

{

	struct dnotify_mark_entry *new_dnentry, *dnentry;

	struct fsnotify_mark *new_entry, *entry;

	struct dnotify_mark *new_dn_mark, *dn_mark;

	struct fsnotify_mark *new_fsn_mark, *fsn_mark;

	struct dnotify_struct *dn;

	struct inode *inode;

	fl_owner_t id = current->files;
@@ -307,7 +307,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 
	__u32 mask;



	/* we use these to tell if we need to kfree */

	new_entry = NULL;

	new_fsn_mark = NULL;

	dn = NULL;



	if (!dir_notify_enable) {
@@ -337,8 +337,8 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 
	}



	/* new fsnotify mark, we expect most fcntl calls to add a new mark */

	new_dnentry = kmem_cache_alloc(dnotify_mark_entry_cache, GFP_KERNEL);

	if (!new_dnentry) {

	new_dn_mark = kmem_cache_alloc(dnotify_mark_cache, GFP_KERNEL);

	if (!new_dn_mark) {

		error = -ENOMEM;

		goto out_err;

	}
@@ -346,29 +346,29 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 
	/* convert the userspace DN_* "arg" to the internal FS_* defines in fsnotify */

	mask = convert_arg(arg);



	/* set up the new_entry and new_dnentry */

	new_entry = &new_dnentry->fsn_entry;

	fsnotify_init_mark(new_entry, dnotify_free_mark);

	new_entry->mask = mask;

	new_dnentry->dn = NULL;

	/* set up the new_fsn_mark and new_dn_mark */

	new_fsn_mark = &new_dn_mark->fsn_mark;

	fsnotify_init_mark(new_fsn_mark, dnotify_free_mark);

	new_fsn_mark->mask = mask;

	new_dn_mark->dn = NULL;



	/* this is needed to prevent the fcntl/close race described below */

	mutex_lock(&dnotify_mark_mutex);



	/* add the new_entry or find an old one. */

	/* add the new_fsn_mark or find an old one. */

	spin_lock(&inode->i_lock);

	entry = fsnotify_find_mark(dnotify_group, inode);

	fsn_mark = fsnotify_find_mark(dnotify_group, inode);

	spin_unlock(&inode->i_lock);

	if (entry) {

		dnentry = container_of(entry, struct dnotify_mark_entry, fsn_entry);

		spin_lock(&entry->lock);

	if (fsn_mark) {

		dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark);

		spin_lock(&fsn_mark->lock);

	} else {

		fsnotify_add_mark(new_entry, dnotify_group, inode, 0);

		spin_lock(&new_entry->lock);

		entry = new_entry;

		dnentry = new_dnentry;

		/* we used new_entry, so don't free it */

		new_entry = NULL;

		fsnotify_add_mark(new_fsn_mark, dnotify_group, inode, 0);

		spin_lock(&new_fsn_mark->lock);

		fsn_mark = new_fsn_mark;

		dn_mark = new_dn_mark;

		/* we used new_fsn_mark, so don't free it */

		new_fsn_mark = NULL;

	}



	rcu_read_lock();
@@ -377,17 +377,17 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 


	/* if (f != filp) means that we lost a race and another task/thread

	 * actually closed the fd we are still playing with before we grabbed

	 * the dnotify_mark_mutex and entry->lock.  Since closing the fd is the

	 * the dnotify_mark_mutex and fsn_mark->lock.  Since closing the fd is the

	 * only time we clean up the marks we need to get our mark off

	 * the list. */

	if (f != filp) {

		/* if we added ourselves, shoot ourselves, it's possible that

		 * the flush actually did shoot this entry.  That's fine too

		 * the flush actually did shoot this fsn_mark.  That's fine too

		 * since multiple calls to destroy_mark is perfectly safe, if

		 * we found a dnentry already attached to the inode, just sod

		 * we found a dn_mark already attached to the inode, just sod

		 * off silently as the flush at close time dealt with it.

		 */

		if (dnentry == new_dnentry)

		if (dn_mark == new_dn_mark)

			destroy = 1;

		goto out;

	}
@@ -395,13 +395,13 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 
	error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);

	if (error) {

		/* if we added, we must shoot */

		if (dnentry == new_dnentry)

		if (dn_mark == new_dn_mark)

			destroy = 1;

		goto out;

	}



	error = attach_dn(dn, dnentry, id, fd, filp, mask);

	/* !error means that we attached the dn to the dnentry, so don't free it */

	error = attach_dn(dn, dn_mark, id, fd, filp, mask);

	/* !error means that we attached the dn to the dn_mark, so don't free it */

	if (!error)

		dn = NULL;

	/* -EEXIST means that we didn't add this new dn and used an old one.
@@ -409,20 +409,20 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 
	else if (error == -EEXIST)

		error = 0;



	dnotify_recalc_inode_mask(entry);

	dnotify_recalc_inode_mask(fsn_mark);

out:

	spin_unlock(&entry->lock);

	spin_unlock(&fsn_mark->lock);



	if (destroy)

		fsnotify_destroy_mark(entry);

		fsnotify_destroy_mark(fsn_mark);



	fsnotify_recalc_group_mask(dnotify_group);



	mutex_unlock(&dnotify_mark_mutex);

	fsnotify_put_mark(entry);

	fsnotify_put_mark(fsn_mark);

out_err:

	if (new_entry)

		fsnotify_put_mark(new_entry);

	if (new_fsn_mark)

		fsnotify_put_mark(new_fsn_mark);

	if (dn)

		kmem_cache_free(dnotify_struct_cache, dn);

	return error;
@@ -431,7 +431,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) 
static int __init dnotify_init(void)

{

	dnotify_struct_cache = KMEM_CACHE(dnotify_struct, SLAB_PANIC);

	dnotify_mark_entry_cache = KMEM_CACHE(dnotify_mark_entry, SLAB_PANIC);

	dnotify_mark_cache = KMEM_CACHE(dnotify_mark, SLAB_PANIC);



	dnotify_group = fsnotify_alloc_group(&dnotify_fsnotify_ops);

	if (IS_ERR(dnotify_group))