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From: Amir Goldstein <amir73il@gmail.com>
To: Jan Kara <jack@suse.cz>
Cc: Matthew Bobrowski <repnop@google.com>, linux-fsdevel@vger.kernel.org
Subject: [PATCH v3 02/16] inotify: move control flags from mask to mark flags
Date: Wed, 13 Apr 2022 12:09:21 +0300	[thread overview]
Message-ID: <20220413090935.3127107-3-amir73il@gmail.com> (raw)
In-Reply-To: <20220413090935.3127107-1-amir73il@gmail.com>

The inotify control flags in the mark mask (e.g. FS_IN_ONE_SHOT) are not
relevant to object interest mask, so move them to the mark flags.

This frees up some bits in the object interest mask.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/notify/fsnotify.c                 |  4 +--
 fs/notify/inotify/inotify.h          | 11 ++++++--
 fs/notify/inotify/inotify_fsnotify.c |  2 +-
 fs/notify/inotify/inotify_user.c     | 38 ++++++++++++++++++----------
 include/linux/fsnotify_backend.h     | 16 +++++++-----
 5 files changed, 45 insertions(+), 26 deletions(-)

diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 70a8516b78bc..6eee19d15e8c 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -253,7 +253,7 @@ static int fsnotify_handle_inode_event(struct fsnotify_group *group,
 	if (WARN_ON_ONCE(!inode && !dir))
 		return 0;
 
-	if ((inode_mark->mask & FS_EXCL_UNLINK) &&
+	if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) &&
 	    path && d_unlinked(path->dentry))
 		return 0;
 
@@ -581,7 +581,7 @@ static __init int fsnotify_init(void)
 {
 	int ret;
 
-	BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
+	BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
 
 	ret = init_srcu_struct(&fsnotify_mark_srcu);
 	if (ret)
diff --git a/fs/notify/inotify/inotify.h b/fs/notify/inotify/inotify.h
index 8f00151eb731..7d5df7a21539 100644
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -27,11 +27,18 @@ static inline struct inotify_event_info *INOTIFY_E(struct fsnotify_event *fse)
  * userspace.  There is at least one bit (FS_EVENT_ON_CHILD) which is
  * used only internally to the kernel.
  */
-#define INOTIFY_USER_MASK (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK)
+#define INOTIFY_USER_MASK (IN_ALL_EVENTS)
 
 static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
 {
-	return fsn_mark->mask & INOTIFY_USER_MASK;
+	__u32 mask = fsn_mark->mask & INOTIFY_USER_MASK;
+
+	if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK)
+		mask |= IN_EXCL_UNLINK;
+	if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
+		mask |= IN_ONESHOT;
+
+	return mask;
 }
 
 extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index d92d7b0adc9a..49cfe2ae6d23 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -122,7 +122,7 @@ int inotify_handle_inode_event(struct fsnotify_mark *inode_mark, u32 mask,
 		fsnotify_destroy_event(group, fsn_event);
 	}
 
-	if (inode_mark->mask & IN_ONESHOT)
+	if (inode_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
 		fsnotify_destroy_mark(inode_mark, group);
 
 	return 0;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 3ef57db0ec9d..d8907d32a05b 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -115,6 +115,21 @@ static inline __u32 inotify_arg_to_mask(struct inode *inode, u32 arg)
 	return mask;
 }
 
+#define INOTIFY_MARK_FLAGS \
+	(FSNOTIFY_MARK_FLAG_EXCL_UNLINK | FSNOTIFY_MARK_FLAG_IN_ONESHOT)
+
+static inline unsigned int inotify_arg_to_flags(u32 arg)
+{
+	unsigned int flags = 0;
+
+	if (arg & IN_EXCL_UNLINK)
+		flags |= FSNOTIFY_MARK_FLAG_EXCL_UNLINK;
+	if (arg & IN_ONESHOT)
+		flags |= FSNOTIFY_MARK_FLAG_IN_ONESHOT;
+
+	return flags;
+}
+
 static inline u32 inotify_mask_to_arg(__u32 mask)
 {
 	return mask & (IN_ALL_EVENTS | IN_ISDIR | IN_UNMOUNT | IN_IGNORED |
@@ -526,13 +541,10 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
 	struct fsnotify_mark *fsn_mark;
 	struct inotify_inode_mark *i_mark;
 	__u32 old_mask, new_mask;
-	__u32 mask;
-	int add = (arg & IN_MASK_ADD);
+	int replace = !(arg & IN_MASK_ADD);
 	int create = (arg & IN_MASK_CREATE);
 	int ret;
 
-	mask = inotify_arg_to_mask(inode, arg);
-
 	fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
 	if (!fsn_mark)
 		return -ENOENT;
@@ -545,10 +557,12 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
 
 	spin_lock(&fsn_mark->lock);
 	old_mask = fsn_mark->mask;
-	if (add)
-		fsn_mark->mask |= mask;
-	else
-		fsn_mark->mask = mask;
+	if (replace) {
+		fsn_mark->mask = 0;
+		fsn_mark->flags &= ~INOTIFY_MARK_FLAGS;
+	}
+	fsn_mark->mask |= inotify_arg_to_mask(inode, arg);
+	fsn_mark->flags |= inotify_arg_to_flags(arg);
 	new_mask = fsn_mark->mask;
 	spin_unlock(&fsn_mark->lock);
 
@@ -579,19 +593,17 @@ static int inotify_new_watch(struct fsnotify_group *group,
 			     u32 arg)
 {
 	struct inotify_inode_mark *tmp_i_mark;
-	__u32 mask;
 	int ret;
 	struct idr *idr = &group->inotify_data.idr;
 	spinlock_t *idr_lock = &group->inotify_data.idr_lock;
 
-	mask = inotify_arg_to_mask(inode, arg);
-
 	tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL);
 	if (unlikely(!tmp_i_mark))
 		return -ENOMEM;
 
 	fsnotify_init_mark(&tmp_i_mark->fsn_mark, group);
-	tmp_i_mark->fsn_mark.mask = mask;
+	tmp_i_mark->fsn_mark.mask = inotify_arg_to_mask(inode, arg);
+	tmp_i_mark->fsn_mark.flags = inotify_arg_to_flags(arg);
 	tmp_i_mark->wd = -1;
 
 	ret = inotify_add_to_idr(idr, idr_lock, tmp_i_mark);
@@ -845,9 +857,7 @@ static int __init inotify_user_setup(void)
 	BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT);
 	BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW);
 	BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED);
-	BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK);
 	BUILD_BUG_ON(IN_ISDIR != FS_ISDIR);
-	BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT);
 
 	BUILD_BUG_ON(HWEIGHT32(ALL_INOTIFY_BITS) != 22);
 
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 0805b74cae44..b1c72edd9784 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -55,7 +55,6 @@
 #define FS_ACCESS_PERM		0x00020000	/* access event in a permissions hook */
 #define FS_OPEN_EXEC_PERM	0x00040000	/* open/exec event in a permission hook */
 
-#define FS_EXCL_UNLINK		0x04000000	/* do not send events if object is unlinked */
 /*
  * Set on inode mark that cares about things that happen to its children.
  * Always set for dnotify and inotify.
@@ -66,7 +65,6 @@
 #define FS_RENAME		0x10000000	/* File was renamed */
 #define FS_DN_MULTISHOT		0x20000000	/* dnotify multishot */
 #define FS_ISDIR		0x40000000	/* event occurred against dir */
-#define FS_IN_ONESHOT		0x80000000	/* only send event once */
 
 #define FS_MOVE			(FS_MOVED_FROM | FS_MOVED_TO)
 
@@ -106,8 +104,7 @@
 			     FS_ERROR)
 
 /* Extra flags that may be reported with event or control handling of events */
-#define ALL_FSNOTIFY_FLAGS  (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
-			     FS_DN_MULTISHOT | FS_EVENT_ON_CHILD)
+#define ALL_FSNOTIFY_FLAGS  (FS_ISDIR | FS_EVENT_ON_CHILD | FS_DN_MULTISHOT)
 
 #define ALL_FSNOTIFY_BITS   (ALL_FSNOTIFY_EVENTS | ALL_FSNOTIFY_FLAGS)
 
@@ -473,9 +470,14 @@ struct fsnotify_mark {
 	struct fsnotify_mark_connector *connector;
 	/* Events types to ignore [mark->lock, group->mark_mutex] */
 	__u32 ignored_mask;
-#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY	0x01
-#define FSNOTIFY_MARK_FLAG_ALIVE		0x02
-#define FSNOTIFY_MARK_FLAG_ATTACHED		0x04
+	/* General fsnotify mark flags */
+#define FSNOTIFY_MARK_FLAG_ALIVE		0x0001
+#define FSNOTIFY_MARK_FLAG_ATTACHED		0x0002
+	/* inotify mark flags */
+#define FSNOTIFY_MARK_FLAG_EXCL_UNLINK		0x0010
+#define FSNOTIFY_MARK_FLAG_IN_ONESHOT		0x0020
+	/* fanotify mark flags */
+#define FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY	0x0100
 	unsigned int flags;		/* flags [mark->lock] */
 };
 
-- 
2.35.1


  parent reply	other threads:[~2022-04-13  9:09 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-13  9:09 [PATCH v3 00/16] Evictable fanotify marks Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 01/16] inotify: show inotify mask flags in proc fdinfo Amir Goldstein
2022-04-13  9:09 ` Amir Goldstein [this message]
2022-04-13  9:09 ` [PATCH v3 03/16] fsnotify: fix wrong lockdep annotations Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 04/16] fsnotify: pass flags argument to fsnotify_add_mark() via mark Amir Goldstein
2022-04-21 14:18   ` Jan Kara
2022-04-22 10:02     ` Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 05/16] fsnotify: pass flags argument to fsnotify_alloc_group() Amir Goldstein
2022-04-21 14:34   ` Jan Kara
2022-04-13  9:09 ` [PATCH v3 06/16] fsnotify: create helpers for group mark_mutex lock Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 07/16] inotify: use fsnotify group lock helpers Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 08/16] audit: " Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 09/16] nfsd: " Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 10/16] dnotify: " Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 11/16] fsnotify: allow adding an inode mark without pinning inode Amir Goldstein
2022-04-21 14:54   ` Jan Kara
2022-04-13  9:09 ` [PATCH v3 12/16] fanotify: create helper fanotify_mark_user_flags() Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 13/16] fanotify: factor out helper fanotify_mark_update_flags() Amir Goldstein
2022-04-21 15:00   ` Jan Kara
2022-04-13  9:09 ` [PATCH v3 14/16] fanotify: implement "evictable" inode marks Amir Goldstein
2022-04-21 15:40   ` Jan Kara
2022-04-22 10:47     ` Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 15/16] fanotify: use fsnotify group lock helpers Amir Goldstein
2022-04-13  9:09 ` [PATCH v3 16/16] fanotify: enable "evictable" inode marks Amir Goldstein
2022-04-21 15:41 ` [PATCH v3 00/16] Evictable fanotify marks Jan Kara

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