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SubjectRe: [RFC][PATCH 2/2] first callers of process_deny_checkpoint()
Quoting Dave Hansen (dave@linux.vnet.ibm.com):
>
> These are just a few simple examples of things we know we can't
> checkpoint now. There are plenty more, but this should give
> everyone an idea how this will look in practice.
>
>
> Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
> ---
>
> linux-2.6.git-dave/fs/aio.c | 7 +++++++
> linux-2.6.git-dave/ipc/mqueue.c | 3 +++
> linux-2.6.git-dave/net/socket.c | 5 +++++
> 3 files changed, 15 insertions(+)
>
> diff -puN fs/aio.c~no-checkpointing-for-sockets fs/aio.c
> --- linux-2.6.git/fs/aio.c~no-checkpointing-for-sockets 2008-10-09 11:56:58.000000000 -0700
> +++ linux-2.6.git-dave/fs/aio.c 2008-10-09 11:56:58.000000000 -0700
> @@ -19,6 +19,7 @@
>
> #define DEBUG 0
>
> +#include <linux/checkpoint.h>
> #include <linux/sched.h>
> #include <linux/fs.h>
> #include <linux/file.h>
> @@ -1663,6 +1664,8 @@ asmlinkage long sys_io_submit(aio_contex
> if (unlikely(!access_ok(VERIFY_READ, iocbpp, (nr*sizeof(*iocbpp)))))
> return -EFAULT;
>
> + process_deny_checkpointing(current);
> +
> ctx = lookup_ioctx(ctx_id);
> if (unlikely(!ctx)) {
> pr_debug("EINVAL: io_submit: invalid context id\n");
> @@ -1742,6 +1745,8 @@ asmlinkage long sys_io_cancel(aio_contex
> if (unlikely(!ctx))
> return -EINVAL;
>
> + process_deny_checkpointing(current);
> +
> spin_lock_irq(&ctx->ctx_lock);
> ret = -EAGAIN;
> kiocb = lookup_kiocb(ctx, iocb, key);
> @@ -1796,6 +1801,8 @@ asmlinkage long sys_io_getevents(aio_con
> struct kioctx *ioctx = lookup_ioctx(ctx_id);
> long ret = -EINVAL;
>
> + process_deny_checkpointing(current);

Hmm, I don't know too much about aio, but is it possible to succeed with
io_getevents if we didn't first do a submit? It looks like the contexts
are looked up out of current->mm, so I don't think we need this call
here.

Otherwise, this is neat.

-serge

> +
> if (likely(ioctx)) {
> if (likely(min_nr <= nr && min_nr >= 0 && nr >= 0))
> ret = read_events(ioctx, min_nr, nr, events, timeout);
> diff -puN ipc/mqueue.c~no-checkpointing-for-sockets ipc/mqueue.c
> --- linux-2.6.git/ipc/mqueue.c~no-checkpointing-for-sockets 2008-10-09 11:56:58.000000000 -0700
> +++ linux-2.6.git-dave/ipc/mqueue.c 2008-10-09 11:56:58.000000000 -0700
> @@ -14,6 +14,7 @@
> */
>
> #include <linux/capability.h>
> +#include <linux/checkpoint.h>
> #include <linux/init.h>
> #include <linux/pagemap.h>
> #include <linux/file.h>
> @@ -655,6 +656,8 @@ asmlinkage long sys_mq_open(const char _
> char *name;
> int fd, error;
>
> + process_deny_checkpointing(current);
> +
> error = audit_mq_open(oflag, mode, u_attr);
> if (error != 0)
> return error;
> diff -puN net/socket.c~no-checkpointing-for-sockets net/socket.c
> --- linux-2.6.git/net/socket.c~no-checkpointing-for-sockets 2008-10-09 11:56:58.000000000 -0700
> +++ linux-2.6.git-dave/net/socket.c 2008-10-09 11:56:58.000000000 -0700
> @@ -87,6 +87,7 @@
> #include <linux/audit.h>
> #include <linux/wireless.h>
> #include <linux/nsproxy.h>
> +#include <linux/checkpoint.h>
>
> #include <asm/uaccess.h>
> #include <asm/unistd.h>
> @@ -1236,6 +1237,8 @@ asmlinkage long sys_socket(int family, i
> if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
> flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
>
> + process_deny_checkpointing(current);
> +
> retval = sock_create(family, type, protocol, &sock);
> if (retval < 0)
> goto out;
> @@ -2130,6 +2133,8 @@ asmlinkage long sys_socketcall(int call,
> a0 = a[0];
> a1 = a[1];
>
> + process_deny_checkpointing(current);
> +
> switch (call) {
> case SYS_SOCKET:
> err = sys_socket(a0, a1, a[2]);
> _
> _______________________________________________
> Containers mailing list
> Containers@lists.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/containers


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