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fsnotify: pass connp and object type to fsnotify_add_mark()

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Instead of passing inode and vfsmount arguments to fsnotify_add_mark()
and its _locked variant, pass an abstract object pointer and the object
type.

The helpers fsnotify_obj_{inode,mount} are added to get the concrete
object pointer from abstract object pointer.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-06-23 17:54:48 +03:00 committed by Jan Kara
parent 9b6e543450
commit b812a9f589
4 changed files with 52 additions and 39 deletions
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19
fs/notify/fanotify/fanotify_user.c
View File

@ -615,8 +615,8 @@ static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
}
static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
struct inode *inode,
struct vfsmount *mnt)
fsnotify_connp_t *connp,
unsigned int type)
{
struct fsnotify_mark *mark;
int ret;
@ -629,7 +629,7 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
return ERR_PTR(-ENOMEM);
fsnotify_init_mark(mark, group);
ret = fsnotify_add_mark_locked(mark, inode, mnt, 0);
ret = fsnotify_add_mark_locked(mark, connp, type, 0);
if (ret) {
fsnotify_put_mark(mark);
return ERR_PTR(ret);
@ -643,14 +643,15 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
struct vfsmount *mnt, __u32 mask,
unsigned int flags)
{
fsnotify_connp_t *connp = &real_mount(mnt)->mnt_fsnotify_marks;
struct fsnotify_mark *fsn_mark;
__u32 added;
mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_mark(&real_mount(mnt)->mnt_fsnotify_marks,
group);
fsn_mark = fsnotify_find_mark(connp, group);
if (!fsn_mark) {
fsn_mark = fanotify_add_new_mark(group, NULL, mnt);
fsn_mark = fanotify_add_new_mark(group, connp,
FSNOTIFY_OBJ_TYPE_VFSMOUNT);
if (IS_ERR(fsn_mark)) {
mutex_unlock(&group->mark_mutex);
return PTR_ERR(fsn_mark);
@ -669,6 +670,7 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
struct inode *inode, __u32 mask,
unsigned int flags)
{
fsnotify_connp_t *connp = &inode->i_fsnotify_marks;
struct fsnotify_mark *fsn_mark;
__u32 added;
@ -685,9 +687,10 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
return 0;
mutex_lock(&group->mark_mutex);
fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
fsn_mark = fsnotify_find_mark(connp, group);
if (!fsn_mark) {
fsn_mark = fanotify_add_new_mark(group, inode, NULL);
fsn_mark = fanotify_add_new_mark(group, connp,
FSNOTIFY_OBJ_TYPE_INODE);
if (IS_ERR(fsn_mark)) {
mutex_unlock(&group->mark_mutex);
return PTR_ERR(fsn_mark);

10
fs/notify/fsnotify.h
View File

@ -9,6 +9,16 @@
#include "../mount.h"
static inline struct inode *fsnotify_obj_inode(fsnotify_connp_t *connp)
{
return container_of(connp, struct inode, i_fsnotify_marks);
}
static inline struct mount *fsnotify_obj_mount(fsnotify_connp_t *connp)
{
return container_of(connp, struct mount, mnt_fsnotify_marks);
}
/* destroy all events sitting in this groups notification queue */
extern void fsnotify_flush_notify(struct fsnotify_group *group);

42
fs/notify/mark.c
View File

@ -437,9 +437,9 @@ int fsnotify_compare_groups(struct fsnotify_group *a, struct fsnotify_group *b)
}
static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
struct inode *inode,
struct vfsmount *mnt)
unsigned int type)
{
struct inode *inode = NULL;
struct fsnotify_mark_connector *conn;
conn = kmem_cache_alloc(fsnotify_mark_connector_cachep, GFP_KERNEL);
@ -447,13 +447,11 @@ static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp,
return -ENOMEM;
spin_lock_init(&conn->lock);
INIT_HLIST_HEAD(&conn->list);
if (inode) {
conn->type = FSNOTIFY_OBJ_TYPE_INODE;
conn->inode = igrab(inode);
} else {
conn->type = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
conn->mnt = mnt;
}
conn->type = type;
if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
inode = conn->inode = igrab(fsnotify_obj_inode(connp));
else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
conn->mnt = &fsnotify_obj_mount(connp)->mnt;
/*
* cmpxchg() provides the barrier so that readers of *connp can see
* only initialized structure
@ -502,27 +500,22 @@ out:
* priority, highest number first, and then by the group's location in memory.
*/
static int fsnotify_add_mark_list(struct fsnotify_mark *mark,
struct inode *inode, struct vfsmount *mnt,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups)
{
struct fsnotify_mark *lmark, *last = NULL;
struct fsnotify_mark_connector *conn;
fsnotify_connp_t *connp;
int cmp;
int err = 0;
if (WARN_ON(!inode && !mnt))
if (WARN_ON(!fsnotify_valid_obj_type(type)))
return -EINVAL;
if (inode)
connp = &inode->i_fsnotify_marks;
else
connp = &real_mount(mnt)->mnt_fsnotify_marks;
restart:
spin_lock(&mark->lock);
conn = fsnotify_grab_connector(connp);
if (!conn) {
spin_unlock(&mark->lock);
err = fsnotify_attach_connector_to_object(connp, inode, mnt);
err = fsnotify_attach_connector_to_object(connp, type);
if (err)
return err;
goto restart;
@ -568,14 +561,13 @@ out_err:
* These marks may be used for the fsnotify backend to determine which
* event types should be delivered to which group.
*/
int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct inode *inode,
struct vfsmount *mnt, int allow_dups)
int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups)
{
struct fsnotify_group *group = mark->group;
int ret = 0;
BUG_ON(inode && mnt);
BUG_ON(!inode && !mnt);
BUG_ON(!mutex_is_locked(&group->mark_mutex));
/*
@ -592,7 +584,7 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct inode *inode,
fsnotify_get_mark(mark); /* for g_list */
spin_unlock(&mark->lock);
ret = fsnotify_add_mark_list(mark, inode, mnt, allow_dups);
ret = fsnotify_add_mark_list(mark, connp, type, allow_dups);
if (ret)
goto err;
@ -612,14 +604,14 @@ err:
return ret;
}
int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode,
struct vfsmount *mnt, int allow_dups)
int fsnotify_add_mark(struct fsnotify_mark *mark, fsnotify_connp_t *connp,
unsigned int type, int allow_dups)
{
int ret;
struct fsnotify_group *group = mark->group;
mutex_lock(&group->mark_mutex);
ret = fsnotify_add_mark_locked(mark, inode, mnt, allow_dups);
ret = fsnotify_add_mark_locked(mark, connp, type, allow_dups);
mutex_unlock(&group->mark_mutex);
return ret;
}

20
include/linux/fsnotify_backend.h
View File

@ -210,6 +210,11 @@ enum fsnotify_obj_type {
#define FSNOTIFY_OBJ_TYPE_VFSMOUNT_FL (1U << FSNOTIFY_OBJ_TYPE_VFSMOUNT)
#define FSNOTIFY_OBJ_ALL_TYPES_MASK ((1U << FSNOTIFY_OBJ_TYPE_COUNT) - 1)
static inline bool fsnotify_valid_obj_type(unsigned int type)
{
return (type < FSNOTIFY_OBJ_TYPE_COUNT);
}
struct fsnotify_iter_info {
struct fsnotify_mark *marks[FSNOTIFY_OBJ_TYPE_COUNT];
unsigned int report_mask;
@ -398,24 +403,27 @@ extern void fsnotify_init_mark(struct fsnotify_mark *mark,
/* Find mark belonging to given group in the list of marks */
extern struct fsnotify_mark *fsnotify_find_mark(fsnotify_connp_t *connp,
struct fsnotify_group *group);
/* attach the mark to the inode or vfsmount */
extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode,
struct vfsmount *mnt, int allow_dups);
/* attach the mark to the object */
extern int fsnotify_add_mark(struct fsnotify_mark *mark,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups);
extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
struct inode *inode, struct vfsmount *mnt,
fsnotify_connp_t *connp, unsigned int type,
int allow_dups);
/* attach the mark to the inode */
static inline int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
struct inode *inode,
int allow_dups)
{
return fsnotify_add_mark(mark, inode, NULL, allow_dups);
return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,
FSNOTIFY_OBJ_TYPE_INODE, allow_dups);
}
static inline int fsnotify_add_inode_mark_locked(struct fsnotify_mark *mark,
struct inode *inode,
int allow_dups)
{
return fsnotify_add_mark_locked(mark, inode, NULL, allow_dups);
return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,
FSNOTIFY_OBJ_TYPE_INODE, allow_dups);
}
/* given a group and a mark, flag mark to be freed when all references are dropped */
extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,