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fsnotify: Move object pointer to fsnotify_mark_connector 

Move pointer to inode / vfsmount from mark itself to the
fsnotify_mark_connector structure. This is another step on the path
towards decoupling inode / vfsmount lifetime from notification mark
lifetime.

Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2017-03-14 14:29:35 +01:00
parent 9dd813c15b
commit 86ffe245c4
8 changed files with 74 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/notify/dnotify/dnotify.c
View File

@ -69,8 +69,8 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)
if (old_mask == new_mask)
return;
if (fsn_mark->inode)
fsnotify_recalc_inode_mask(fsn_mark->inode);
if (fsn_mark->connector)
fsnotify_recalc_inode_mask(fsn_mark->connector->inode);
}
/*

12
fs/notify/fdinfo.c
View File

@ -76,11 +76,11 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
struct inotify_inode_mark *inode_mark;
struct inode *inode;
if (!(mark->flags & FSNOTIFY_MARK_FLAG_INODE))
if (!(mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE))
return;
inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
inode = igrab(mark->inode);
inode = igrab(mark->connector->inode);
if (inode) {
/*
* IN_ALL_EVENTS represents all of the mask bits
@ -115,8 +115,8 @@ 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->flags & FSNOTIFY_MARK_FLAG_INODE) {
inode = igrab(mark->inode);
if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) {
inode = igrab(mark->connector->inode);
if (!inode)
return;
seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
@ -125,8 +125,8 @@ 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->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
struct mount *mnt = real_mount(mark->mnt);
} else if (mark->connector->flags & 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",
mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);

3
fs/notify/fsnotify.h
View File

@ -26,6 +26,7 @@ extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
/* Add mark to a proper place in mark list */
extern int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
struct fsnotify_mark *mark,
struct inode *inode, struct vfsmount *mnt,
int allow_dups);
/* add a mark to an inode */
extern int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
@ -44,7 +45,7 @@ extern void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark);
extern struct fsnotify_mark *fsnotify_find_mark(
struct fsnotify_mark_connector *conn,
struct fsnotify_group *group);
/* Destroy all marks in the given list protected by 'lock' */
/* Destroy all marks connected via given connector protected by 'lock' */
extern void fsnotify_destroy_marks(struct fsnotify_mark_connector *conn,
spinlock_t *lock);
/* run the list of all marks associated with inode and destroy them */

18
fs/notify/inode_mark.c
View File

@ -45,7 +45,7 @@ void fsnotify_recalc_inode_mask(struct inode *inode)
void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
{
struct inode *inode = mark->inode;
struct inode *inode = mark->connector->inode;
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
assert_spin_locked(&mark->lock);
@ -53,7 +53,7 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
spin_lock(&inode->i_lock);
hlist_del_init_rcu(&mark->obj_list);
mark->inode = NULL;
mark->connector = NULL;
/*
* this mark is now off the inode->i_fsnotify_marks list and we
@ -69,7 +69,7 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
*/
void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group)
{
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_INODE);
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_OBJ_TYPE_INODE);
}
/*
@ -99,11 +99,10 @@ void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *mark,
assert_spin_locked(&mark->lock);
if (mask &&
mark->inode &&
if (mask && mark->connector &&
!(mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) {
mark->flags |= FSNOTIFY_MARK_FLAG_OBJECT_PINNED;
inode = igrab(mark->inode);
inode = igrab(mark->connector->inode);
/*
* we shouldn't be able to get here if the inode wasn't
* already safely held in memory. But bug in case it
@ -126,15 +125,12 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
{
int ret;
mark->flags |= FSNOTIFY_MARK_FLAG_INODE;
BUG_ON(!mutex_is_locked(&group->mark_mutex));
assert_spin_locked(&mark->lock);
spin_lock(&inode->i_lock);
mark->inode = inode;
ret = fsnotify_add_mark_list(&inode->i_fsnotify_marks, mark,
allow_dups);
ret = fsnotify_add_mark_list(&inode->i_fsnotify_marks, mark, inode,
NULL, allow_dups);
inode->i_fsnotify_mask = fsnotify_recalc_mask(inode->i_fsnotify_marks);
spin_unlock(&inode->i_lock);

32
fs/notify/mark.c
View File

@ -142,10 +142,10 @@ void fsnotify_detach_mark(struct fsnotify_mark *mark)
mark->flags &= ~FSNOTIFY_MARK_FLAG_ATTACHED;
if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
inode = mark->inode;
if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) {
inode = mark->connector->inode;
fsnotify_destroy_inode_mark(mark);
} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT)
} else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT)
fsnotify_destroy_vfsmount_mark(mark);
else
BUG();
@ -275,7 +275,7 @@ void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
mark->mask = mask;
if (mark->flags & FSNOTIFY_MARK_FLAG_INODE)
if (mark->connector && mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE)
fsnotify_set_inode_mark_mask_locked(mark, mask);
}
@ -323,7 +323,9 @@ int fsnotify_compare_groups(struct fsnotify_group *a, struct fsnotify_group *b)
}
static int fsnotify_attach_connector_to_object(
struct fsnotify_mark_connector **connp)
struct fsnotify_mark_connector **connp,
struct inode *inode,
struct vfsmount *mnt)
{
struct fsnotify_mark_connector *conn;
@ -331,6 +333,13 @@ static int fsnotify_attach_connector_to_object(
if (!conn)
return -ENOMEM;
INIT_HLIST_HEAD(&conn->list);
if (inode) {
conn->flags = FSNOTIFY_OBJ_TYPE_INODE;
conn->inode = inode;
} else {
conn->flags = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
conn->mnt = mnt;
}
/*
* Make sure 'conn' initialization is visible. Matches
* lockless_dereference() in fsnotify().
@ -348,7 +357,8 @@ static int fsnotify_attach_connector_to_object(
* priority, highest number first, and then by the group's location in memory.
*/
int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
struct fsnotify_mark *mark, int allow_dups)
struct fsnotify_mark *mark, struct inode *inode,
struct vfsmount *mnt, int allow_dups)
{
struct fsnotify_mark *lmark, *last = NULL;
struct fsnotify_mark_connector *conn;
@ -356,7 +366,7 @@ int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
int err;
if (!*connp) {
err = fsnotify_attach_connector_to_object(connp);
err = fsnotify_attach_connector_to_object(connp, inode, mnt);
if (err)
return err;
}
@ -365,7 +375,7 @@ int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
/* is mark the first mark? */
if (hlist_empty(&conn->list)) {
hlist_add_head_rcu(&mark->obj_list, &conn->list);
return 0;
goto added;
}
/* should mark be in the middle of the current list? */
@ -378,13 +388,15 @@ int fsnotify_add_mark_list(struct fsnotify_mark_connector **connp,
cmp = fsnotify_compare_groups(lmark->group, mark->group);
if (cmp >= 0) {
hlist_add_before_rcu(&mark->obj_list, &lmark->obj_list);
return 0;
goto added;
}
}
BUG_ON(last == NULL);
/* mark should be the last entry. last is the current last entry */
hlist_add_behind_rcu(&mark->obj_list, &last->obj_list);
added:
mark->connector = conn;
return 0;
}
@ -507,7 +519,7 @@ void fsnotify_clear_marks_by_group_flags(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->flags & flags)
if (mark->connector->flags & flags)
list_move(&mark->g_list, &to_free);
}
mutex_unlock(&group->mark_mutex);

12
fs/notify/vfsmount_mark.c
View File

@ -31,7 +31,7 @@
void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group)
{
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_VFSMOUNT);
fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_OBJ_TYPE_VFSMOUNT);
}
/*
@ -49,7 +49,7 @@ void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt)
void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
{
struct vfsmount *mnt = mark->mnt;
struct vfsmount *mnt = mark->connector->mnt;
struct mount *m = real_mount(mnt);
BUG_ON(!mutex_is_locked(&mark->group->mark_mutex));
@ -58,7 +58,7 @@ void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark)
spin_lock(&mnt->mnt_root->d_lock);
hlist_del_init_rcu(&mark->obj_list);
mark->mnt = NULL;
mark->connector = NULL;
m->mnt_fsnotify_mask = fsnotify_recalc_mask(m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);
@ -93,14 +93,12 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
struct mount *m = real_mount(mnt);
int ret;
mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
BUG_ON(!mutex_is_locked(&group->mark_mutex));
assert_spin_locked(&mark->lock);
spin_lock(&mnt->mnt_root->d_lock);
mark->mnt = mnt;
ret = fsnotify_add_mark_list(&m->mnt_fsnotify_marks, mark, allow_dups);
ret = fsnotify_add_mark_list(&m->mnt_fsnotify_marks, mark, NULL, mnt,
allow_dups);
m->mnt_fsnotify_mask = fsnotify_recalc_mask(m->mnt_fsnotify_marks);
spin_unlock(&mnt->mnt_root->d_lock);

17
include/linux/fsnotify_backend.h
View File

@ -200,6 +200,13 @@ struct fsnotify_group {
* freed.
*/
struct fsnotify_mark_connector {
#define FSNOTIFY_OBJ_TYPE_INODE 0x01
#define FSNOTIFY_OBJ_TYPE_VFSMOUNT 0x02
unsigned int flags; /* Type of object [lock] */
union { /* Object pointer [lock] */
struct inode *inode;
struct vfsmount *mnt;
};
struct hlist_head list;
};
@ -234,14 +241,10 @@ struct fsnotify_mark {
spinlock_t lock;
/* List of marks for inode / vfsmount [obj_lock] */
struct hlist_node obj_list;
union { /* Object pointer [mark->lock, group->mark_mutex] */
struct inode *inode; /* inode this mark is associated with */
struct vfsmount *mnt; /* vfsmount this mark is associated with */
};
/* Head of list of marks for an object [mark->lock, group->mark_mutex] */
struct fsnotify_mark_connector *connector;
/* Events types to ignore [mark->lock, group->mark_mutex] */
__u32 ignored_mask;
#define FSNOTIFY_MARK_FLAG_INODE 0x01
#define FSNOTIFY_MARK_FLAG_VFSMOUNT 0x02
#define FSNOTIFY_MARK_FLAG_OBJECT_PINNED 0x04
#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY 0x08
#define FSNOTIFY_MARK_FLAG_ALIVE 0x10
@ -353,7 +356,7 @@ extern void fsnotify_free_mark(struct fsnotify_mark *mark);
extern void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group);
/* run all the marks in a group, and clear all of the inode marks */
extern void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group);
/* run all the marks in a group, and clear all of the marks where mark->flags & flags is true*/
/* run all the marks in a group, and clear all of the marks attached to given object type */
extern void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group, unsigned int flags);
extern void fsnotify_connector_free(struct fsnotify_mark_connector **connp);
extern void fsnotify_get_mark(struct fsnotify_mark *mark);

25
kernel/audit_tree.c
View File

@ -172,10 +172,25 @@ static unsigned long inode_to_key(const struct inode *inode)
/*
* Function to return search key in our hash from chunk. Key 0 is special and
* should never be present in the hash.
*
* Must be called with chunk->mark.lock held to protect from connector
* becoming NULL.
*/
static unsigned long __chunk_to_key(struct audit_chunk *chunk)
{
if (!chunk->mark.connector)
return 0;
return (unsigned long)chunk->mark.connector->inode;
}
static unsigned long chunk_to_key(struct audit_chunk *chunk)
{
return (unsigned long)chunk->mark.inode;
unsigned long key;
spin_lock(&chunk->mark.lock);
key = __chunk_to_key(chunk);
spin_unlock(&chunk->mark.lock);
return key;
}
static inline struct list_head *chunk_hash(unsigned long key)
@ -187,7 +202,7 @@ static inline struct list_head *chunk_hash(unsigned long key)
/* hash_lock & entry->lock is held by caller */
static void insert_hash(struct audit_chunk *chunk)
{
unsigned long key = chunk_to_key(chunk);
unsigned long key = __chunk_to_key(chunk);
struct list_head *list;
if (!(chunk->mark.flags & FSNOTIFY_MARK_FLAG_ATTACHED))
@ -276,8 +291,8 @@ static void untag_chunk(struct node *p)
if (!new)
goto Fallback;
if (fsnotify_add_mark_locked(&new->mark, entry->group, entry->inode,
NULL, 1)) {
if (fsnotify_add_mark_locked(&new->mark, entry->group,
entry->connector->inode, NULL, 1)) {
fsnotify_put_mark(&new->mark);
goto Fallback;
}
@ -418,7 +433,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
}
if (fsnotify_add_mark_locked(chunk_entry, old_entry->group,
old_entry->inode, NULL, 1)) {
old_entry->connector->inode, NULL, 1)) {
spin_unlock(&old_entry->lock);
mutex_unlock(&old_entry->group->mark_mutex);
fsnotify_put_mark(chunk_entry);