VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Oleg Nesterov <oleg@redhat.com> 2013-04-30 15:28:15 -0700 committer: Linus Torvalds <torvalds@linux-foundation.org> 2013-04-30 17:04:06 -0700 commit: 528f827ee0bb508af5c9466562f474675540473e parent: acdedd99b0f3bff9b4bb2103a6b1268c03d1f963
Commit Summary:
coredump: introduce dump_interrupted()
Diffstat:
1 file changed, 17 insertions, 3 deletions
diff --git a/fs/coredump.c b/fs/coredump.c
index acc4448c28e7..aa8ac69a548f 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -418,6 +418,17 @@ static void coredump_finish(struct mm_struct *mm, bool core_dumped)
 	mm->core_state = NULL;
 }
 
+static bool dump_interrupted(void)
+{
+	/*
+	 * SIGKILL or freezing() interrupt the coredumping. Perhaps we
+	 * can do try_to_freeze() and check __fatal_signal_pending(),
+	 * but then we need to teach dump_write() to restart and clear
+	 * TIF_SIGPENDING.
+	 */
+	return signal_pending(current);
+}
+
 static void wait_for_dump_helpers(struct file *file)
 {
 	struct pipe_inode_info *pipe;
@@ -641,7 +652,7 @@ void do_coredump(siginfo_t *siginfo)
 		goto close_fail;
 	if (displaced)
 		put_files_struct(displaced);
-	core_dumped = binfmt->core_dump(&cprm);
+	core_dumped = !dump_interrupted() && binfmt->core_dump(&cprm);
 
 	if (ispipe && core_pipe_limit)
 		wait_for_dump_helpers(cprm.file);
@@ -669,7 +680,9 @@ fail:
  */
 int dump_write(struct file *file, const void *addr, int nr)
 {
-	return access_ok(VERIFY_READ, addr, nr) && file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+	return !dump_interrupted() &&
+		access_ok(VERIFY_READ, addr, nr) &&
+		file->f_op->write(file, addr, nr, &file->f_pos) == nr;
 }
 EXPORT_SYMBOL(dump_write);
 
@@ -678,7 +691,8 @@ int dump_seek(struct file *file, loff_t off)
 	int ret = 1;
 
 	if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
-		if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
+		if (dump_interrupted() ||
+		    file->f_op->llseek(file, off, SEEK_CUR) < 0)
 			return 0;
 	} else {
 		char *buf = (char *)get_zeroed_page(GFP_KERNEL);