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authorEric W. Biederman <ebiederm@xmission.com>2018-03-22 21:30:56 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-03-22 21:30:56 -0500
commit1a5c1349d105df5196ad9025e271b02a4dc05aee (patch)
tree1269154b73e3821ce0815aca893280c03471fcdf /ipc/sem.c
parentmsg/security: Pass kern_ipc_perm not msg_queue into the msg_queue security hooks (diff)
downloadlinux-dev-1a5c1349d105df5196ad9025e271b02a4dc05aee.tar.xz
linux-dev-1a5c1349d105df5196ad9025e271b02a4dc05aee.zip
sem: Move struct sem and struct sem_array into ipc/sem.c
All of the users are now in ipc/sem.c so make the definitions local to that file to make code maintenance easier. AKA to prevent rebuilding the entire kernel when one of these files is changed. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'ipc/sem.c')
-rw-r--r--ipc/sem.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index 01f5c63670ae..d661c491b0a5 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -88,6 +88,40 @@
#include <linux/uaccess.h>
#include "util.h"
+/* One semaphore structure for each semaphore in the system. */
+struct sem {
+ int semval; /* current value */
+ /*
+ * PID of the process that last modified the semaphore. For
+ * Linux, specifically these are:
+ * - semop
+ * - semctl, via SETVAL and SETALL.
+ * - at task exit when performing undo adjustments (see exit_sem).
+ */
+ int sempid;
+ spinlock_t lock; /* spinlock for fine-grained semtimedop */
+ struct list_head pending_alter; /* pending single-sop operations */
+ /* that alter the semaphore */
+ struct list_head pending_const; /* pending single-sop operations */
+ /* that do not alter the semaphore*/
+ time_t sem_otime; /* candidate for sem_otime */
+} ____cacheline_aligned_in_smp;
+
+/* One sem_array data structure for each set of semaphores in the system. */
+struct sem_array {
+ struct kern_ipc_perm sem_perm; /* permissions .. see ipc.h */
+ time64_t sem_ctime; /* create/last semctl() time */
+ struct list_head pending_alter; /* pending operations */
+ /* that alter the array */
+ struct list_head pending_const; /* pending complex operations */
+ /* that do not alter semvals */
+ struct list_head list_id; /* undo requests on this array */
+ int sem_nsems; /* no. of semaphores in array */
+ int complex_count; /* pending complex operations */
+ unsigned int use_global_lock;/* >0: global lock required */
+
+ struct sem sems[];
+} __randomize_layout;
/* One queue for each sleeping process in the system. */
struct sem_queue {