linux-ext4 - [PATCH 04/11] fanotify: Expose fanotify

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Date:   Thu, 20 May 2021 22:41:27 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     amir73il@...il.com
Cc:     Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com, "Darrick J . Wong" <djwong@...nel.org>,
        Theodore Ts'o <tytso@....edu>,
        Dave Chinner <david@...morbit.com>, jack@...e.com,
        dhowells@...hat.com, khazhy@...gle.com,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: [PATCH 04/11] fanotify: Expose fanotify_mark

FAN_ERROR will require an error structure to be stored per mark.
Therefore, wrap fsnotify_mark in a fanotify specific structure in
preparation for that.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 fs/notify/fanotify/fanotify.c      |  4 +++-
 fs/notify/fanotify/fanotify.h      | 10 ++++++++++
 fs/notify/fanotify/fanotify_user.c | 14 +++++++-------
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 711b36a9483e..34e2ee759b39 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -869,7 +869,9 @@ static void fanotify_freeing_mark(struct fsnotify_mark *mark,
 
 static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
 {
-	kmem_cache_free(fanotify_mark_cache, fsn_mark);
+	struct fanotify_mark *mark = FANOTIFY_MARK(fsn_mark);
+
+	kmem_cache_free(fanotify_mark_cache, mark);
 }
 
 const struct fsnotify_ops fanotify_fsnotify_ops = {
diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
index 4a5e555dc3d2..a399c5e2615d 100644
--- a/fs/notify/fanotify/fanotify.h
+++ b/fs/notify/fanotify/fanotify.h
@@ -129,6 +129,16 @@ static inline void fanotify_info_copy_name(struct fanotify_info *info,
 	       name->name);
 }
 
+struct fanotify_mark {
+	struct fsnotify_mark fsn_mark;
+	struct fanotify_error_event *error_event;
+};
+
+static inline struct fanotify_mark *FANOTIFY_MARK(struct fsnotify_mark *mark)
+{
+	return container_of(mark, struct fanotify_mark, fsn_mark);
+}
+
 /*
  * Common structure for fanotify events. Concrete structs are allocated in
  * fanotify_handle_event() and freed when the information is retrieved by
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 9cc6c8808ed5..00210535a78e 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -914,7 +914,7 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
 						   __kernel_fsid_t *fsid)
 {
 	struct ucounts *ucounts = group->fanotify_data.ucounts;
-	struct fsnotify_mark *mark;
+	struct fanotify_mark *mark;
 	int ret;
 
 	/*
@@ -926,20 +926,20 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
 	    !inc_ucount(ucounts->ns, ucounts->uid, UCOUNT_FANOTIFY_MARKS))
 		return ERR_PTR(-ENOSPC);
 
-	mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
+	mark = kmem_cache_zalloc(fanotify_mark_cache, GFP_KERNEL);
 	if (!mark) {
 		ret = -ENOMEM;
 		goto out_dec_ucounts;
 	}
 
-	fsnotify_init_mark(mark, group);
-	ret = fsnotify_add_mark_locked(mark, connp, type, 0, fsid);
+	fsnotify_init_mark(&mark->fsn_mark, group);
+	ret = fsnotify_add_mark_locked(&mark->fsn_mark, connp, type, 0, fsid);
 	if (ret) {
-		fsnotify_put_mark(mark);
+		fsnotify_put_mark(&mark->fsn_mark);
 		goto out_dec_ucounts;
 	}
 
-	return mark;
+	return &mark->fsn_mark;
 
 out_dec_ucounts:
 	if (!FAN_GROUP_FLAG(group, FAN_UNLIMITED_MARKS))
@@ -1477,7 +1477,7 @@ static int __init fanotify_user_setup(void)
 	BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 10);
 	BUILD_BUG_ON(HWEIGHT32(FANOTIFY_MARK_FLAGS) != 9);
 
-	fanotify_mark_cache = KMEM_CACHE(fsnotify_mark,
+	fanotify_mark_cache = KMEM_CACHE(fanotify_mark,
 					 SLAB_PANIC|SLAB_ACCOUNT);
 	fanotify_fid_event_cachep = KMEM_CACHE(fanotify_fid_event,
 					       SLAB_PANIC);
-- 
2.31.0