From b812a9f5896379b6cff2ac168ddb5b89037d8e78 Mon Sep 17 00:00:00 2001 From: Amir Goldstein Date: Sat, 23 Jun 2018 17:54:48 +0300 Subject: fsnotify: pass connp and object type to fsnotify_add_mark() 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 Signed-off-by: Jan Kara --- fs/notify/fanotify/fanotify_user.c | 19 +++++++++-------- fs/notify/fsnotify.h | 10 +++++++++ fs/notify/mark.c | 42 +++++++++++++++----------------------- include/linux/fsnotify_backend.h | 20 ++++++++++++------ 4 files changed, 52 insertions(+), 39 deletions(-) diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index ec4d8c59d0e3..81212b251189 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -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); diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h index 94cedf8264ba..caeee042d1cc 100644 --- a/fs/notify/fsnotify.h +++ b/fs/notify/fsnotify.h @@ -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); diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 7b595acd8ec9..7abb73b5beba 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -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; } diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index e7cd7fc6e3cf..8efb8663453d 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -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, -- cgit v1.2.3