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[24.5.85.70]) by smtp.gmail.com with ESMTPSA id c12sm10541220pfn.13.2018.04.20.16.09.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 20 Apr 2018 16:09:52 -0700 (PDT) From: Amir Goldstein To: Jan Kara Cc: linux-fsdevel@vger.kernel.org Subject: [PATCH v3 10/13] fsnotify: pass object and object type to fsnotify_add_mark() Date: Fri, 20 Apr 2018 16:10:58 -0700 Message-Id: <1524265861-6316-11-git-send-email-amir73il@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1524265861-6316-1-git-send-email-amir73il@gmail.com> References: <1524265861-6316-1-git-send-email-amir73il@gmail.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Instead of passing inode and vfsmount arguments to fsnotify_add_mark() and its _locked variant, pass an abstract fsnotify_obj and the object type. This is going to be used for adding a mark to a new type of object (super block object). Signed-off-by: Amir Goldstein --- fs/notify/fanotify/fanotify_user.c | 16 ++++++++------- fs/notify/mark.c | 42 +++++++++++++++----------------------- include/linux/fsnotify_backend.h | 18 +++++++++++----- 3 files changed, 39 insertions(+), 37 deletions(-) diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index c15de35c3ebc..42ec185be089 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -614,8 +614,8 @@ 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) + struct fsnotify_obj *obj, + unsigned int type) { struct fsnotify_mark *mark; int ret; @@ -628,7 +628,7 @@ 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, obj, type, 0); if (ret) { fsnotify_put_mark(mark); return ERR_PTR(ret); @@ -642,13 +642,14 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group, struct vfsmount *mnt, __u32 mask, unsigned int flags) { + struct fsnotify_obj *obj = &real_mount(mnt)->mnt_fsnotify; struct fsnotify_mark *fsn_mark; __u32 added; mutex_lock(&group->mark_mutex); - fsn_mark = fsnotify_find_mark(&real_mount(mnt)->mnt_fsnotify, group); + fsn_mark = fsnotify_find_mark(obj, group); if (!fsn_mark) { - fsn_mark = fanotify_add_new_mark(group, NULL, mnt); + fsn_mark = fanotify_add_new_mark(group, obj, FSNOTIFY_OBJ_TYPE_VFSMOUNT); if (IS_ERR(fsn_mark)) { mutex_unlock(&group->mark_mutex); return PTR_ERR(fsn_mark); @@ -667,6 +668,7 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group, struct inode *inode, __u32 mask, unsigned int flags) { + struct fsnotify_obj *obj = &inode->i_fsnotify; struct fsnotify_mark *fsn_mark; __u32 added; @@ -683,9 +685,9 @@ 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, group); + fsn_mark = fsnotify_find_mark(obj, group); if (!fsn_mark) { - fsn_mark = fanotify_add_new_mark(group, inode, NULL); + fsn_mark = fanotify_add_new_mark(group, obj, FSNOTIFY_OBJ_TYPE_INODE); if (IS_ERR(fsn_mark)) { mutex_unlock(&group->mark_mutex); return PTR_ERR(fsn_mark); diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 2cd2a872bd66..771178c46eeb 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(struct fsnotify_obj *obj, - 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(struct fsnotify_obj *obj, 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(obj)); + else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) + conn->mnt = &fsnotify_obj_mount(obj)->mnt; /* * cmpxchg() provides the barrier so that readers of obj->marks can see * only initialized structure @@ -502,27 +500,22 @@ static struct fsnotify_mark_connector *fsnotify_grab_connector( * 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, + struct fsnotify_obj *obj, unsigned int type, int allow_dups) { struct fsnotify_mark *lmark, *last = NULL; struct fsnotify_mark_connector *conn; - struct fsnotify_obj *obj; int cmp; int err = 0; - if (WARN_ON(!inode && !mnt)) + if (WARN_ON(!fsnotify_valid_obj_type(type))) return -EINVAL; - if (inode) - obj = &inode->i_fsnotify; - else - obj = &real_mount(mnt)->mnt_fsnotify; restart: spin_lock(&mark->lock); conn = fsnotify_grab_connector(obj); if (!conn) { spin_unlock(&mark->lock); - err = fsnotify_attach_connector_to_object(obj, inode, mnt); + err = fsnotify_attach_connector_to_object(obj, type); if (err) return err; goto restart; @@ -568,14 +561,13 @@ static int fsnotify_add_mark_list(struct fsnotify_mark *mark, * 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, + struct fsnotify_obj *obj, 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, obj, type, allow_dups); if (ret) goto err; @@ -612,14 +604,14 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct inode *inode, 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, struct fsnotify_obj *obj, + 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, obj, 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 15ea4661995d..b2826dd1e68c 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -211,6 +211,11 @@ 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; @@ -403,23 +408,26 @@ extern void fsnotify_init_mark(struct fsnotify_mark *mark, extern struct fsnotify_mark *fsnotify_find_mark(struct fsnotify_obj *obj, 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); +extern int fsnotify_add_mark(struct fsnotify_mark *mark, + struct fsnotify_obj *obj, unsigned int type, + int allow_dups); extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark, - struct inode *inode, struct vfsmount *mnt, + struct fsnotify_obj *obj, 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, + 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, + 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,