new helper: dump_emit()
dump_write() analog, takes core_dump_params instead of file,
keeps track of the amount written in cprm->written and checks for
cprm->limit. Start using it in binfmt_elf.c...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/coredump.c b/fs/coredump.c
index 42c3b84..319f973 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -693,6 +693,20 @@
}
EXPORT_SYMBOL(dump_write);
+int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
+{
+ struct file *file = cprm->file;
+ if (dump_interrupted() || !access_ok(VERIFY_READ, addr, nr))
+ return 0;
+ if (cprm->written + nr > cprm->limit)
+ return 0;
+ if (file->f_op->write(file, addr, nr, &file->f_pos) != nr)
+ return 0;
+ cprm->written += nr;
+ return 1;
+}
+EXPORT_SYMBOL(dump_emit);
+
int dump_seek(struct file *file, loff_t off)
{
int ret = 1;