[PATCH 5/13] BC: user interface (syscalls)

[Kirill Korotaev <dev@sw.ru>]

Add the following system calls for BC management:
 1. sys_get_bcid     - get current BC id
 2. sys_set_bcid     - change exec_ and fork_ BCs on current
 3. sys_set_bclimit  - set limits for resources consumtions 
 4. sys_get_bcstat   - return br_resource_parm on resource

Signed-off-by: Pavel Emelianov <xemul@sw.ru>
Signed-off-by: Kirill Korotaev <dev@sw.ru>

---

 arch/i386/kernel/syscall_table.S |    4 +
 arch/ia64/kernel/entry.S         |    4 +
 arch/sparc/kernel/entry.S        |    2 
 arch/sparc/kernel/systbls.S      |    6 +
 arch/sparc64/kernel/entry.S      |    2 
 arch/sparc64/kernel/systbls.S    |   10 ++-
 include/asm-i386/unistd.h        |    6 +
 include/asm-ia64/unistd.h        |    6 +
 include/asm-powerpc/systbl.h     |    4 +
 include/asm-powerpc/unistd.h     |    6 +
 include/asm-sparc/unistd.h       |    4 +
 include/asm-sparc64/unistd.h     |    4 +
 include/asm-x86_64/unistd.h      |   10 ++-
 kernel/bc/Makefile               |    1 
 kernel/bc/sys.c                  |  120 +++++++++++++++++++++++++++++++++++++++
 kernel/sys_ni.c                  |    6 +
 16 files changed, 186 insertions(+), 9 deletions(-)

--- ./arch/i386/kernel/syscall_table.S.bcsys	2006-09-05 11:47:31.000000000 +0400
+++ ./arch/i386/kernel/syscall_table.S	2006-09-05 12:47:21.000000000 +0400
@@ -318,3 +318,7 @@ ENTRY(sys_call_table)
 	.long sys_vmsplice
 	.long sys_move_pages
 	.long sys_getcpu
+	.long sys_get_bcid
+	.long sys_set_bcid		/* 320 */
+	.long sys_set_bclimit
+	.long sys_get_bcstat
--- ./arch/ia64/kernel/entry.S.bcsys	2006-09-05 11:47:31.000000000 +0400
+++ ./arch/ia64/kernel/entry.S	2006-09-05 12:47:21.000000000 +0400
@@ -1610,5 +1610,9 @@ sys_call_table:
 	data8 sys_sync_file_range		// 1300
 	data8 sys_tee
 	data8 sys_vmsplice
+	data8 sys_get_bcid
+	data8 sys_set_bcid
+	data8 sys_set_bclimit			// 1305
+	data8 sys_get_bcstat
 
 	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
--- ./arch/sparc/kernel/entry.S.bcsys	2006-07-10 12:39:10.000000000 +0400
+++ ./arch/sparc/kernel/entry.S	2006-09-05 12:47:21.000000000 +0400
@@ -37,7 +37,7 @@
 
 #define curptr      g6
 
-#define NR_SYSCALLS 300      /* Each OS is different... */
+#define NR_SYSCALLS 304      /* Each OS is different... */
 
 /* These are just handy. */
 #define _SV	save	%sp, -STACKFRAME_SZ, %sp
--- ./arch/sparc/kernel/systbls.S.bcsys	2006-07-10 12:39:10.000000000 +0400
+++ ./arch/sparc/kernel/systbls.S	2006-09-05 12:47:21.000000000 +0400
@@ -78,7 +78,8 @@ sys_call_table:
 /*285*/	.long sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, sys_fstatat64
 /*290*/	.long sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
 /*295*/	.long sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare
-/*300*/	.long sys_set_robust_list, sys_get_robust_list
+/*300*/	.long sys_set_robust_list, sys_get_robust_list, sys_get_bcid, sys_set_bcid, sys_set_bclimit
+/*305*/	.long sys_get_bcstat
 
 #ifdef CONFIG_SUNOS_EMUL
 	/* Now the SunOS syscall table. */
@@ -192,4 +193,7 @@ sunos_sys_table:
 	.long sunos_nosys, sunos_nosys, sunos_nosys
 	.long sunos_nosys, sunos_nosys, sunos_nosys
 
+	.long sunos_nosys, sunos_nosys, sunos_nosys,
+	.long sunos_nosys
+
 #endif
--- ./arch/sparc64/kernel/entry.S.bcsys	2006-07-10 12:39:10.000000000 +0400
+++ ./arch/sparc64/kernel/entry.S	2006-09-05 12:47:21.000000000 +0400
@@ -25,7 +25,7 @@
 
 #define curptr      g6
 
-#define NR_SYSCALLS 300      /* Each OS is different... */
+#define NR_SYSCALLS 304      /* Each OS is different... */
 
 	.text
 	.align		32
--- ./arch/sparc64/kernel/systbls.S.bcsys	2006-07-10 12:39:11.000000000 +0400
+++ ./arch/sparc64/kernel/systbls.S	2006-09-05 12:47:21.000000000 +0400
@@ -79,7 +79,8 @@ sys_call_table32:
 	.word sys_mkdirat, sys_mknodat, sys_fchownat, compat_sys_futimesat, compat_sys_fstatat64
 /*290*/	.word sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
 	.word sys_fchmodat, sys_faccessat, compat_sys_pselect6, compat_sys_ppoll, sys_unshare
-/*300*/	.word compat_sys_set_robust_list, compat_sys_get_robust_list
+/*300*/	.word compat_sys_set_robust_list, compat_sys_get_robust_list, sys_nis_syscall, sys_nis_syscall, sys_nis_syscall
+	.word sys_nis_syscall
 
 #endif /* CONFIG_COMPAT */
 
@@ -149,7 +150,9 @@ sys_call_table:
 	.word sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, sys_fstatat64
 /*290*/	.word sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
 	.word sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare
-/*300*/	.word sys_set_robust_list, sys_get_robust_list
+/*300*/	.word sys_set_robust_list, sys_get_robust_list, sys_get_bcid, sys_set_bcid, sys_set_bclimit
+	.word sys_get_bcstat
+
 
 #if defined(CONFIG_SUNOS_EMUL) || defined(CONFIG_SOLARIS_EMUL) || \
     defined(CONFIG_SOLARIS_EMUL_MODULE)
@@ -263,4 +266,7 @@ sunos_sys_table:
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
+
+	.word sunos_nosys, sunos_nosys, sunos_nosys
+	.word sunos_nosys
 #endif
--- ./include/asm-i386/unistd.h.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./include/asm-i386/unistd.h	2006-09-05 12:48:37.000000000 +0400
@@ -324,8 +324,12 @@
 #define __NR_vmsplice		316
 #define __NR_move_pages		317
 #define __NR_getcpu		318
+#define __NR_get_bcid		319
+#define __NR_set_bcid		320
+#define __NR_set_bclimit	321
+#define __NR_get_bcstat		322
 
-#define NR_syscalls 318
+#define NR_syscalls 323
 #include <linux/err.h>
 
 /*
--- ./include/asm-ia64/unistd.h.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./include/asm-ia64/unistd.h	2006-09-05 12:47:21.000000000 +0400
@@ -291,11 +291,15 @@
 #define __NR_sync_file_range		1300
 #define __NR_tee			1301
 #define __NR_vmsplice			1302
+#define __NR_get_bcid			1303
+#define __NR_set_bcid			1304
+#define __NR_set_bclimit		1305
+#define __NR_get_bcstat			1306
 
 #ifdef __KERNEL__
 
 
-#define NR_syscalls			279 /* length of syscall table */
+#define NR_syscalls			283 /* length of syscall table */
 
 #define __ARCH_WANT_SYS_RT_SIGACTION
 
--- ./include/asm-powerpc/systbl.h.bcsys	2006-07-10 12:39:19.000000000 +0400
+++ ./include/asm-powerpc/systbl.h	2006-09-05 12:47:21.000000000 +0400
@@ -304,3 +304,7 @@ SYSCALL_SPU(fchmodat)
 SYSCALL_SPU(faccessat)
 COMPAT_SYS_SPU(get_robust_list)
 COMPAT_SYS_SPU(set_robust_list)
+SYSCALL(sys_get_bcid)
+SYSCALL(sys_set_bcid)
+SYSCALL(sys_set_bclimit)
+SYSCALL(sys_get_bcstat)
--- ./include/asm-powerpc/unistd.h.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./include/asm-powerpc/unistd.h	2006-09-05 12:47:21.000000000 +0400
@@ -323,10 +323,14 @@
 #define __NR_faccessat		298
 #define __NR_get_robust_list	299
 #define __NR_set_robust_list	300
+#define __NR_get_bcid		301
+#define __NR_set_bcid		302
+#define __NR_set_bclimit	303
+#define __NR_get_bcstat		304
 
 #ifdef __KERNEL__
 
-#define __NR_syscalls		301
+#define __NR_syscalls		305
 
 #define __NR__exit __NR_exit
 #define NR_syscalls	__NR_syscalls
--- ./include/asm-sparc/unistd.h.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./include/asm-sparc/unistd.h	2006-09-05 12:47:21.000000000 +0400
@@ -318,6 +318,10 @@
 #define __NR_unshare		299
 #define __NR_set_robust_list	300
 #define __NR_get_robust_list	301
+#define __NR_get_bcid		302
+#define __NR_set_bcid		303
+#define __NR_set_bclimit	304
+#define __NR_get_bcstat		305
 
 #ifdef __KERNEL__
 /* WARNING: You MAY NOT add syscall numbers larger than 301, since
--- ./include/asm-sparc64/unistd.h.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./include/asm-sparc64/unistd.h	2006-09-05 12:47:21.000000000 +0400
@@ -320,6 +320,10 @@
 #define __NR_unshare		299
 #define __NR_set_robust_list	300
 #define __NR_get_robust_list	301
+#define __NR_get_bcid		302
+#define __NR_set_bcid		303
+#define __NR_set_bclimit	304
+#define __NR_get_bcstat		305
 
 #ifdef __KERNEL__
 /* WARNING: You MAY NOT add syscall numbers larger than 301, since
--- ./include/asm-x86_64/unistd.h.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./include/asm-x86_64/unistd.h	2006-09-05 12:49:03.000000000 +0400
@@ -619,8 +619,16 @@ __SYSCALL(__NR_sync_file_range, sys_sync
 __SYSCALL(__NR_vmsplice, sys_vmsplice)
 #define __NR_move_pages		279
 __SYSCALL(__NR_move_pages, sys_move_pages)
+#define __NR_get_bcid		280
+__SYSCALL(__NR_get_bcid, sys_get_bcid)
+#define __NR_set_bcid		281
+__SYSCALL(__NR_set_bcid, sys_set_bcid)
+#define __NR_set_bclimit	282
+__SYSCALL(__NR_set_bclimit, sys_set_bclimit)
+#define __NR_get_bcstat		283
+__SYSCALL(__NR_get_bcstat, sys_get_bcstat)
 
-#define __NR_syscall_max __NR_move_pages
+#define __NR_syscall_max __NR_get_bcstat
 #include <linux/err.h>
 
 #ifndef __NO_STUBS
--- ./kernel/bc/Makefile.bcsys	2006-09-05 12:24:39.000000000 +0400
+++ ./kernel/bc/Makefile	2006-09-05 12:49:28.000000000 +0400
@@ -6,3 +6,4 @@
 
 obj-y += beancounter.o
 obj-y += misc.o
+obj-y += sys.o
--- /dev/null	2006-07-18 14:52:43.075228448 +0400
+++ ./kernel/bc/sys.c	2006-09-05 12:47:21.000000000 +0400
@@ -0,0 +1,120 @@
+/*
+ *  kernel/bc/sys.c
+ *
+ *  Copyright (C) 2006 OpenVZ. SWsoft Inc
+ *
+ */
+
+#include <linux/sched.h>
+#include <asm/uaccess.h>
+
+#include <bc/beancounter.h>
+#include <bc/task.h>
+
+asmlinkage long sys_get_bcid(void)
+{
+	struct beancounter *bc;
+
+	bc = get_exec_bc();
+	return bc->bc_id;
+}
+
+asmlinkage long sys_set_bcid(bcid_t id)
+{
+	int error;
+	struct beancounter *bc;
+	struct task_beancounter *task_bc;
+
+	task_bc = &current->task_bc;
+
+	/* You may only set an bc as root */
+	error = -EPERM;
+	if (!capable(CAP_SETUID))
+		goto out;
+
+	/* Ok - set up a beancounter entry for this user */
+	error = -ENOMEM;
+	bc = beancounter_findcreate(id, BC_ALLOC);
+	if (bc == NULL)
+		goto out;
+
+	/* install bc */
+	put_beancounter(task_bc->exec_bc);
+	task_bc->exec_bc = bc;
+	put_beancounter(task_bc->fork_bc);
+	task_bc->fork_bc = get_beancounter(bc);
+	error = 0;
+out:
+	return error;
+}
+
+asmlinkage long sys_set_bclimit(bcid_t id, unsigned long resource,
+		unsigned long __user *limits)
+{
+	int error;
+	unsigned long flags;
+	struct beancounter *bc;
+	unsigned long new_limits[2];
+
+	error = -EPERM;
+	if(!capable(CAP_SYS_RESOURCE))
+		goto out;
+
+	error = -EINVAL;
+	if (resource >= BC_RESOURCES)
+		goto out;
+
+	error = -EFAULT;
+	if (copy_from_user(&new_limits, limits, sizeof(new_limits)))
+		goto out;
+
+	error = -EINVAL;
+	if (new_limits[0] > BC_MAXVALUE || new_limits[1] > BC_MAXVALUE ||
+			new_limits[0] > new_limits[1])
+		goto out;
+
+	error = -ENOENT;
+	bc = beancounter_findcreate(id, BC_LOOKUP);
+	if (bc == NULL)
+		goto out;
+
+	spin_lock_irqsave(&bc->bc_lock, flags);
+	bc->bc_parms[resource].barrier = new_limits[0];
+	bc->bc_parms[resource].limit = new_limits[1];
+	spin_unlock_irqrestore(&bc->bc_lock, flags);
+
+	put_beancounter(bc);
+	error = 0;
+out:
+	return error;
+}
+
+int sys_get_bcstat(bcid_t id, unsigned long resource,
+		struct bc_resource_parm __user *uparm)
+{
+	int error;
+	unsigned long flags;
+	struct beancounter *bc;
+	struct bc_resource_parm parm;
+
+	error = -EINVAL;
+	if (resource >= BC_RESOURCES)
+		goto out;
+
+	error = -ENOENT;
+	bc = beancounter_findcreate(id, BC_LOOKUP);
+	if (bc == NULL)
+		goto out;
+
+	spin_lock_irqsave(&bc->bc_lock, flags);
+	parm = bc->bc_parms[resource];
+	spin_unlock_irqrestore(&bc->bc_lock, flags);
+	put_beancounter(bc);
+
+	error = 0;
+	if (copy_to_user(uparm, &parm, sizeof(parm)))
+		error = -EFAULT;
+
+out:
+	return error;
+}
--- ./kernel/sys_ni.c.bcsys	2006-09-05 11:47:33.000000000 +0400
+++ ./kernel/sys_ni.c	2006-09-05 12:49:16.000000000 +0400
@@ -139,3 +139,9 @@ cond_syscall(compat_sys_move_pages);
 cond_syscall(sys_bdflush);
 cond_syscall(sys_ioprio_set);
 cond_syscall(sys_ioprio_get);
+
+/* user resources syscalls */
+cond_syscall(sys_set_bcid);
+cond_syscall(sys_get_bcid);
+cond_syscall(sys_set_bclimit);
+cond_syscall(sys_get_bcstat);