5.15-stable review patch. If anyone has any objections, please let me know.
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From: Amir Goldstein amir73il@gmail.com
[ Upstream commit 867a448d587e7fa845bceaf4ee1c632448f2a9fa ]
Add flags argument to fsnotify_alloc_group(), define and use the flag FSNOTIFY_GROUP_USER in inotify and fanotify instead of the helper fsnotify_alloc_user_group() to indicate user allocation.
Although the flag FSNOTIFY_GROUP_USER is currently not used after group allocation, we store the flags argument in the group struct for future use of other group flags.
Link: https://lore.kernel.org/r/20220422120327.3459282-5-amir73il@gmail.com Signed-off-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Jan Kara jack@suse.cz Signed-off-by: Chuck Lever chuck.lever@oracle.com --- fs/nfsd/filecache.c | 3 ++- fs/notify/dnotify/dnotify.c | 2 +- fs/notify/fanotify/fanotify_user.c | 3 ++- fs/notify/group.c | 21 +++++++++------------ fs/notify/inotify/inotify_user.c | 3 ++- include/linux/fsnotify_backend.h | 8 ++++++-- kernel/audit_fsnotify.c | 3 ++- kernel/audit_tree.c | 2 +- kernel/audit_watch.c | 2 +- 9 files changed, 26 insertions(+), 21 deletions(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c index 429ae485ebbbe..97ca256a76323 100644 --- a/fs/nfsd/filecache.c +++ b/fs/nfsd/filecache.c @@ -671,7 +671,8 @@ nfsd_file_cache_init(void) goto out_shrinker; }
- nfsd_file_fsnotify_group = fsnotify_alloc_group(&nfsd_file_fsnotify_ops); + nfsd_file_fsnotify_group = fsnotify_alloc_group(&nfsd_file_fsnotify_ops, + 0); if (IS_ERR(nfsd_file_fsnotify_group)) { pr_err("nfsd: unable to create fsnotify group: %ld\n", PTR_ERR(nfsd_file_fsnotify_group)); diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c index d5ebebb034ffe..6c586802c50e6 100644 --- a/fs/notify/dnotify/dnotify.c +++ b/fs/notify/dnotify/dnotify.c @@ -383,7 +383,7 @@ static int __init dnotify_init(void) SLAB_PANIC|SLAB_ACCOUNT); dnotify_mark_cache = KMEM_CACHE(dnotify_mark, SLAB_PANIC|SLAB_ACCOUNT);
- dnotify_group = fsnotify_alloc_group(&dnotify_fsnotify_ops); + dnotify_group = fsnotify_alloc_group(&dnotify_fsnotify_ops, 0); if (IS_ERR(dnotify_group)) panic("unable to allocate fsnotify group for dnotify\n"); return 0; diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 336ccec2abed3..f23326be0d371 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -1351,7 +1351,8 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags) f_flags |= O_NONBLOCK;
/* fsnotify_alloc_group takes a ref. Dropped in fanotify_release */ - group = fsnotify_alloc_user_group(&fanotify_fsnotify_ops); + group = fsnotify_alloc_group(&fanotify_fsnotify_ops, + FSNOTIFY_GROUP_USER); if (IS_ERR(group)) { return PTR_ERR(group); } diff --git a/fs/notify/group.c b/fs/notify/group.c index b7d4d64f87c29..18446b7b0d495 100644 --- a/fs/notify/group.c +++ b/fs/notify/group.c @@ -112,7 +112,8 @@ void fsnotify_put_group(struct fsnotify_group *group) EXPORT_SYMBOL_GPL(fsnotify_put_group);
static struct fsnotify_group *__fsnotify_alloc_group( - const struct fsnotify_ops *ops, gfp_t gfp) + const struct fsnotify_ops *ops, + int flags, gfp_t gfp) { struct fsnotify_group *group;
@@ -133,6 +134,7 @@ static struct fsnotify_group *__fsnotify_alloc_group( INIT_LIST_HEAD(&group->marks_list);
group->ops = ops; + group->flags = flags;
return group; } @@ -140,20 +142,15 @@ static struct fsnotify_group *__fsnotify_alloc_group( /* * Create a new fsnotify_group and hold a reference for the group returned. */ -struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) +struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops, + int flags) { - return __fsnotify_alloc_group(ops, GFP_KERNEL); -} -EXPORT_SYMBOL_GPL(fsnotify_alloc_group); + gfp_t gfp = (flags & FSNOTIFY_GROUP_USER) ? GFP_KERNEL_ACCOUNT : + GFP_KERNEL;
-/* - * Create a new fsnotify_group and hold a reference for the group returned. - */ -struct fsnotify_group *fsnotify_alloc_user_group(const struct fsnotify_ops *ops) -{ - return __fsnotify_alloc_group(ops, GFP_KERNEL_ACCOUNT); + return __fsnotify_alloc_group(ops, flags, gfp); } -EXPORT_SYMBOL_GPL(fsnotify_alloc_user_group); +EXPORT_SYMBOL_GPL(fsnotify_alloc_group);
int fsnotify_fasync(int fd, struct file *file, int on) { diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c index fdce87902b382..0d8e1bead23ea 100644 --- a/fs/notify/inotify/inotify_user.c +++ b/fs/notify/inotify/inotify_user.c @@ -648,7 +648,8 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events) struct fsnotify_group *group; struct inotify_event_info *oevent;
- group = fsnotify_alloc_user_group(&inotify_fsnotify_ops); + group = fsnotify_alloc_group(&inotify_fsnotify_ops, + FSNOTIFY_GROUP_USER); if (IS_ERR(group)) return group;
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index b1c72edd97845..f0bf557af0091 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -210,6 +210,9 @@ struct fsnotify_group { unsigned int priority; bool shutdown; /* group is being shut down, don't queue more events */
+#define FSNOTIFY_GROUP_USER 0x01 /* user allocated group */ + int flags; + /* stores all fastpath marks assoc with this group so they can be cleaned on unregister */ struct mutex mark_mutex; /* protect marks_list */ atomic_t user_waits; /* Number of tasks waiting for user @@ -543,8 +546,9 @@ static inline void fsnotify_update_flags(struct dentry *dentry) /* called from fsnotify listeners, such as fanotify or dnotify */
/* create a new group */ -extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops); -extern struct fsnotify_group *fsnotify_alloc_user_group(const struct fsnotify_ops *ops); +extern struct fsnotify_group *fsnotify_alloc_group( + const struct fsnotify_ops *ops, + int flags); /* get reference to a group */ extern void fsnotify_get_group(struct fsnotify_group *group); /* drop reference on a group from fsnotify_alloc_group */ diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c index 7a506b65e8630..8dee00959eb3d 100644 --- a/kernel/audit_fsnotify.c +++ b/kernel/audit_fsnotify.c @@ -182,7 +182,8 @@ static const struct fsnotify_ops audit_mark_fsnotify_ops = {
static int __init audit_fsnotify_init(void) { - audit_fsnotify_group = fsnotify_alloc_group(&audit_mark_fsnotify_ops); + audit_fsnotify_group = fsnotify_alloc_group(&audit_mark_fsnotify_ops, + 0); if (IS_ERR(audit_fsnotify_group)) { audit_fsnotify_group = NULL; audit_panic("cannot create audit fsnotify group"); diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c index 2cd7b5694422d..18ab4575ae009 100644 --- a/kernel/audit_tree.c +++ b/kernel/audit_tree.c @@ -1073,7 +1073,7 @@ static int __init audit_tree_init(void)
audit_tree_mark_cachep = KMEM_CACHE(audit_tree_mark, SLAB_PANIC);
- audit_tree_group = fsnotify_alloc_group(&audit_tree_ops); + audit_tree_group = fsnotify_alloc_group(&audit_tree_ops, 0); if (IS_ERR(audit_tree_group)) audit_panic("cannot initialize fsnotify group for rectree watches");
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c index fd7b30a2d9a4b..5cf22fe301493 100644 --- a/kernel/audit_watch.c +++ b/kernel/audit_watch.c @@ -492,7 +492,7 @@ static const struct fsnotify_ops audit_watch_fsnotify_ops = {
static int __init audit_watch_init(void) { - audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops); + audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops, 0); if (IS_ERR(audit_watch_group)) { audit_watch_group = NULL; audit_panic("cannot create audit fsnotify group");