From: Christoph Hellwig <hch@lst.de>
Date: Mon, 22 Apr 2024 17:01:17 +0000 (-0700)
Subject: libxfs: provide a kernel-compatible kasprintf
X-Git-Tag: v6.9.0~12^2~5
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b654d15510f4be85acdd71b521adb4bc1e052eaf;p=thirdparty%2Fxfsprogs-dev.git

libxfs: provide a kernel-compatible kasprintf

The kernel-like kasprintf will be used by the new metadir code, as well
as the rmap data structures in xfs_repair.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: tweak commit message]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---

diff --git a/include/kmem.h b/include/kmem.h
index 386b4a6b..8dfb2fb0 100644
--- a/include/kmem.h
+++ b/include/kmem.h
@@ -65,4 +65,7 @@ static inline void kfree(const void *ptr)
 	free((void *)ptr);
 }
 
+__attribute__((format(printf,2,3)))
+char *kasprintf(gfp_t gfp, const char *fmt, ...);
+
 #endif
diff --git a/libxfs/kmem.c b/libxfs/kmem.c
index a2a3935d..2e293518 100644
--- a/libxfs/kmem.c
+++ b/libxfs/kmem.c
@@ -104,3 +104,16 @@ krealloc(void *ptr, size_t new_size, int flags)
 	}
 	return ptr;
 }
+
+char *kasprintf(gfp_t gfp, const char *fmt, ...)
+{
+	va_list ap;
+	char *p;
+
+	va_start(ap, fmt);
+	if (vasprintf(&p, fmt, ap) < 0)
+		p = NULL;
+	va_end(ap);
+
+	return p;
+}