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fsnotify: use type id to identify connector object type

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An fsnotify_mark_connector is referencing a single type of object
(either inode or vfsmount). Instead of storing a type mask in
connector->flags, store a single type id in connector->type to
identify the type of object.

When a connector object is detached from the object, its type is set
to FSNOTIFY_OBJ_TYPE_DETACHED and this object is not going to be
reused.

The function fsnotify_clear_marks_by_group() is the only place where
type mask was used, so use type flags instead of type id to this
function.

This change is going to be more convenient when adding a new object
type (super block).

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-04-20 16:10:49 -07:00 committed by Jan Kara
parent 3acf4e3952
commit d6f7b98bc8
4 changed files with 32 additions and 26 deletions
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6
fs/notify/fdinfo.c
View File

@ -77,7 +77,7 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
struct inotify_inode_mark *inode_mark;
struct inode *inode;
if (!(mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE))
if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
return;
inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
@ -116,7 +116,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) {
if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
inode = igrab(mark->connector->inode);
if (!inode)
return;
@ -126,7 +126,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
show_mark_fhandle(m, inode);
seq_putc(m, '\n');
iput(inode);
} else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
struct mount *mnt = real_mount(mark->connector->mnt);
seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",

2
fs/notify/group.c
View File

@ -67,7 +67,7 @@ void fsnotify_destroy_group(struct fsnotify_group *group)
fsnotify_group_stop_queueing(group);
/* Clear all marks for this group and queue them for destruction */
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_ALL_TYPES);
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_ALL_TYPES_MASK);
/*
* Some marks can still be pinned when waiting for response from

29
fs/notify/mark.c
View File

@ -119,9 +119,9 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
if (mark->flags & FSNOTIFY_MARK_FLAG_ATTACHED)
new_mask |= mark->mask;
}
if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
conn->inode->i_fsnotify_mask = new_mask;
else if (conn->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT)
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
real_mount(conn->mnt)->mnt_fsnotify_mask = new_mask;
}
@ -139,7 +139,7 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
spin_lock(&conn->lock);
__fsnotify_recalc_mask(conn);
spin_unlock(&conn->lock);
if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
__fsnotify_update_child_dentry_flags(conn->inode);
}
@ -166,18 +166,18 @@ static struct inode *fsnotify_detach_connector_from_object(
{
struct inode *inode = NULL;
if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE) {
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) {
inode = conn->inode;
rcu_assign_pointer(inode->i_fsnotify_marks, NULL);
inode->i_fsnotify_mask = 0;
conn->inode = NULL;
conn->flags &= ~FSNOTIFY_OBJ_TYPE_INODE;
} else if (conn->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
} else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
rcu_assign_pointer(real_mount(conn->mnt)->mnt_fsnotify_marks,
NULL);
real_mount(conn->mnt)->mnt_fsnotify_mask = 0;
conn->mnt = NULL;
conn->flags &= ~FSNOTIFY_OBJ_TYPE_VFSMOUNT;
conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
}
return inode;
@ -442,10 +442,10 @@ static int fsnotify_attach_connector_to_object(
spin_lock_init(&conn->lock);
INIT_HLIST_HEAD(&conn->list);
if (inode) {
conn->flags = FSNOTIFY_OBJ_TYPE_INODE;
conn->type = FSNOTIFY_OBJ_TYPE_INODE;
conn->inode = igrab(inode);
} else {
conn->flags = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
conn->type = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
conn->mnt = mnt;
}
/*
@ -479,8 +479,7 @@ static struct fsnotify_mark_connector *fsnotify_grab_connector(
if (!conn)
goto out;
spin_lock(&conn->lock);
if (!(conn->flags & (FSNOTIFY_OBJ_TYPE_INODE |
FSNOTIFY_OBJ_TYPE_VFSMOUNT))) {
if (conn->type == FSNOTIFY_OBJ_TYPE_DETACHED) {
spin_unlock(&conn->lock);
srcu_read_unlock(&fsnotify_mark_srcu, idx);
return NULL;
@ -646,16 +645,16 @@ struct fsnotify_mark *fsnotify_find_mark(
return NULL;
}
/* Clear any marks in a group with given type */
/* Clear any marks in a group with given type mask */
void fsnotify_clear_marks_by_group(struct fsnotify_group *group,
unsigned int type)
unsigned int type_mask)
{
struct fsnotify_mark *lmark, *mark;
LIST_HEAD(to_free);
struct list_head *head = &to_free;
/* Skip selection step if we want to clear all marks. */
if (type == FSNOTIFY_OBJ_ALL_TYPES) {
if (type_mask == FSNOTIFY_OBJ_ALL_TYPES_MASK) {
head = &group->marks_list;
goto clear;
}
@ -670,7 +669,7 @@ void fsnotify_clear_marks_by_group(struct fsnotify_group *group,
*/
mutex_lock_nested(&group->mark_mutex, SINGLE_DEPTH_NESTING);
list_for_each_entry_safe(mark, lmark, &group->marks_list, g_list) {
if (mark->connector->flags & type)
if ((1U << mark->connector->type) & type_mask)
list_move(&mark->g_list, &to_free);
}
mutex_unlock(&group->mark_mutex);

21
include/linux/fsnotify_backend.h
View File

@ -201,6 +201,17 @@ struct fsnotify_group {
#define FSNOTIFY_EVENT_PATH 1
#define FSNOTIFY_EVENT_INODE 2
enum fsnotify_obj_type {
FSNOTIFY_OBJ_TYPE_INODE,
FSNOTIFY_OBJ_TYPE_VFSMOUNT,
FSNOTIFY_OBJ_TYPE_COUNT,
FSNOTIFY_OBJ_TYPE_DETACHED = FSNOTIFY_OBJ_TYPE_COUNT
};
#define FSNOTIFY_OBJ_TYPE_INODE_FL (1U << FSNOTIFY_OBJ_TYPE_INODE)
#define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
#define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
/*
* Inode / vfsmount point to this structure which tracks all marks attached to
* the inode / vfsmount. The reference to inode / vfsmount is held by this
@ -209,11 +220,7 @@ struct fsnotify_group {
*/
struct fsnotify_mark_connector {
spinlock_t lock;
#define FSNOTIFY_OBJ_TYPE_INODE 0x01
#define FSNOTIFY_OBJ_TYPE_VFSMOUNT 0x02
#define FSNOTIFY_OBJ_ALL_TYPES (FSNOTIFY_OBJ_TYPE_INODE | \
FSNOTIFY_OBJ_TYPE_VFSMOUNT)
unsigned int flags; /* Type of object [lock] */
unsigned int type; /* Type of object [lock] */
union { /* Object pointer [lock] */
struct inode *inode;
struct vfsmount *mnt;
@ -369,12 +376,12 @@ extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group, unsigned
/* run all the marks in a group, and clear all of the vfsmount marks */
static inline void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
{
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT);
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL);
}
/* run all the marks in a group, and clear all of the inode marks */
static inline void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
{
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE);
fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_TYPE_INODE_FL);
}
extern void fsnotify_get_mark(struct fsnotify_mark *mark);
extern void fsnotify_put_mark(struct fsnotify_mark *mark);