File 0014-diskdump-Introduce-read_pd.patch of Package crash

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File 0014-diskdump-Introduce-read_pd.patch of Package crash (Revision c3d53a101b11dec4f7af0ce808dd8415)

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From 881f33d97cee9895796829d0cc969b51dd34d831 Mon Sep 17 00:00:00 2001
From: Roman Bolshakov <r.bolshakov@yadro.com>
Date: Thu, 17 Jun 2021 02:27:35 +0300
Subject: [PATCH] diskdump: Introduce read_pd()

Standalone function for reading of page descriptors is needed later for
of expected core size and detection of incomplete dumps.

Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 diskdump.c | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/diskdump.c b/diskdump.c
index 0f94022..de3eeb2 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -510,6 +510,27 @@ arm_kdump_header_adjust(int header_version)
 }
 #endif  /* __i386__ && (ARM || MIPS) */
 
+/*
+ * Read page descriptor.
+ */
+static int
+read_pd(int fd, off_t offset, page_desc_t *pd)
+{
+	const off_t failed = (off_t)-1;
+
+	if (FLAT_FORMAT()) {
+		if (!read_flattened_format(fd, offset, pd, sizeof(*pd)))
+			return READ_ERROR;
+	} else {
+		if (lseek(fd, offset, SEEK_SET) == failed)
+			return SEEK_ERROR;
+		if (read(fd, pd, sizeof(*pd)) != sizeof(*pd))
+			return READ_ERROR;
+	}
+
+	return 0;
+}
+
 static int 
 read_dump_header(char *file)
 {
@@ -1130,15 +1151,9 @@ cache_page(physaddr_t paddr)
 			+ (off_t)(desc_pos - 1)*sizeof(page_desc_t);
 
 	/* read page descriptor */
-	if (FLAT_FORMAT()) {
-		if (!read_flattened_format(dd->dfd, seek_offset, &pd, sizeof(pd)))
-			return READ_ERROR;
-	} else {
-		if (lseek(dd->dfd, seek_offset, SEEK_SET) == failed)
-			return SEEK_ERROR;
-		if (read(dd->dfd, &pd, sizeof(pd)) != sizeof(pd))
-			return READ_ERROR;
-	}
+	ret = read_pd(dd->dfd, seek_offset, &pd);
+	if (ret)
+		return ret;
 
 	/* sanity check */
 	if (pd.size > block_size)
-- 
2.33.1

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File 0014-diskdump-Introduce-read_pd.patch of Package crash (Revision c3d53a101b11dec4f7af0ce808dd8415)

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