[PATCH v2 13/15] fcntl: remove FASYNC_MAGIC

[Ahelenia Ziemiańska]

We have largely moved away from this approach, and we have better
debugging instrumentation nowadays: kill it.

Link: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@xxxxxxxxx/
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
---
 Documentation/process/magic-number.rst                    | 1 -
 Documentation/translations/it_IT/process/magic-number.rst | 1 -
 Documentation/translations/zh_CN/process/magic-number.rst | 1 -
 Documentation/translations/zh_TW/process/magic-number.rst | 1 -
 fs/fcntl.c                                                | 6 ------
 include/linux/fs.h                                        | 3 ---
 6 files changed, 13 deletions(-)

diff --git a/Documentation/process/magic-number.rst b/Documentation/process/magic-number.rst
index e59c707ec785..6e432917a5a8 100644
--- a/Documentation/process/magic-number.rst
+++ b/Documentation/process/magic-number.rst
@@ -68,6 +68,5 @@ Changelog::
 ===================== ================ ======================== ==========================================
 Magic Name            Number           Structure                File
 ===================== ================ ======================== ==========================================
-FASYNC_MAGIC          0x4601           fasync_struct            ``include/linux/fs.h``
 CCB_MAGIC             0xf2691ad2       ccb                      ``drivers/scsi/ncr53c8xx.c``
 ===================== ================ ======================== ==========================================
diff --git a/Documentation/translations/it_IT/process/magic-number.rst b/Documentation/translations/it_IT/process/magic-number.rst
index 37a539867b6f..7d4c117ac626 100644
--- a/Documentation/translations/it_IT/process/magic-number.rst
+++ b/Documentation/translations/it_IT/process/magic-number.rst
@@ -74,6 +74,5 @@ Registro dei cambiamenti::
 ===================== ================ ======================== ==========================================
 Nome magico           Numero           Struttura                File
 ===================== ================ ======================== ==========================================
-FASYNC_MAGIC          0x4601           fasync_struct            ``include/linux/fs.h``
 CCB_MAGIC             0xf2691ad2       ccb                      ``drivers/scsi/ncr53c8xx.c``
 ===================== ================ ======================== ==========================================
diff --git a/Documentation/translations/zh_CN/process/magic-number.rst b/Documentation/translations/zh_CN/process/magic-number.rst
index 8a3a3e872c52..c17e3f20440a 100644
--- a/Documentation/translations/zh_CN/process/magic-number.rst
+++ b/Documentation/translations/zh_CN/process/magic-number.rst
@@ -57,6 +57,5 @@ Linux 魔术数
 ===================== ================ ======================== ==========================================
 魔术数名              数字             结构                     文件
 ===================== ================ ======================== ==========================================
-FASYNC_MAGIC          0x4601           fasync_struct            ``include/linux/fs.h``
 CCB_MAGIC             0xf2691ad2       ccb                      ``drivers/scsi/ncr53c8xx.c``
 ===================== ================ ======================== ==========================================
diff --git a/Documentation/translations/zh_TW/process/magic-number.rst b/Documentation/translations/zh_TW/process/magic-number.rst
index 7ace7834f7f9..e2eeb74e7192 100644
--- a/Documentation/translations/zh_TW/process/magic-number.rst
+++ b/Documentation/translations/zh_TW/process/magic-number.rst
@@ -60,6 +60,5 @@ Linux 魔術數
 ===================== ================ ======================== ==========================================
 魔術數名              數字             結構                     文件
 ===================== ================ ======================== ==========================================
-FASYNC_MAGIC          0x4601           fasync_struct            ``include/linux/fs.h``
 CCB_MAGIC             0xf2691ad2       ccb                      ``drivers/scsi/ncr53c8xx.c``
 ===================== ================ ======================== ==========================================
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 146c9ab0cd4b..e366a3804108 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -924,7 +924,6 @@ struct fasync_struct *fasync_insert_entry(int fd, struct file *filp, struct fasy
 	}
 
 	rwlock_init(&new->fa_lock);
-	new->magic = FASYNC_MAGIC;
 	new->fa_file = filp;
 	new->fa_fd = fd;
 	new->fa_next = *fapp;
@@ -988,11 +987,6 @@ static void kill_fasync_rcu(struct fasync_struct *fa, int sig, int band)
 		struct fown_struct *fown;
 		unsigned long flags;
 
-		if (fa->magic != FASYNC_MAGIC) {
-			printk(KERN_ERR "kill_fasync: bad magic number in "
-			       "fasync_struct!\n");
-			return;
-		}
 		read_lock_irqsave(&fa->fa_lock, flags);
 		if (fa->fa_file) {
 			fown = &fa->fa_file->f_owner;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e654435f1651..acfd5db5341a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1345,15 +1345,12 @@ static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
 
 struct fasync_struct {
 	rwlock_t		fa_lock;
-	int			magic;
 	int			fa_fd;
 	struct fasync_struct	*fa_next; /* singly linked list */
 	struct file		*fa_file;
 	struct rcu_head		fa_rcu;
 };
 
-#define FASYNC_MAGIC 0x4601
-
 /* SMP safe fasync helpers: */
 extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
 extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *);
-- 
2.30.2

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