[Devel] [PATCH 2/3] c/r: kread/kwrite() to abort if CKPT_CTX_ERROR is set

[Oren Laadan]

This is useful particularly in restart to force a task that is
restoring to respond quickly to an error condition due to another
task, instead of only detecting it when it completes (or fails).
For example, when a restarting tasks activates the next task, and
then fails.

Signed-off-by: Oren Laadan <orenl at cs.columbia.edu>
---
 checkpoint/sys.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/checkpoint/sys.c b/checkpoint/sys.c
index dbee469..afcfa1e 100644
--- a/checkpoint/sys.c
+++ b/checkpoint/sys.c
@@ -65,6 +65,9 @@ int ckpt_kwrite(struct ckpt_ctx *ctx, void *addr, int count)
 	mm_segment_t fs;
 	int ret;
 
+	if (ckpt_test_ctx_error(ctx))
+		return ckpt_get_error(ctx);
+
 	fs = get_fs();
 	set_fs(KERNEL_DS);
 	ret = _ckpt_kwrite(ctx->file, addr, count);
@@ -102,6 +105,9 @@ int ckpt_kread(struct ckpt_ctx *ctx, void *addr, int count)
 	mm_segment_t fs;
 	int ret;
 
+	if (ckpt_test_ctx_error(ctx))
+		return ckpt_get_error(ctx);
+
 	fs = get_fs();
 	set_fs(KERNEL_DS);
 	ret = _ckpt_kread(ctx->file , addr, count);
-- 
1.6.3.3

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