linux-ext4 - [PATCH] e2fsprogs: Apple Darwin, fix case of device with not 512 bytes block size

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Date:   Sun, 19 Mar 2017 22:29:26 +0300
From:   Fedor Uporov <thisisadrgreenthumb@...il.com>
To:     linux-ext4@...r.kernel.org
Subject: [PATCH] e2fsprogs: Apple Darwin, fix case of device with not 512
 bytes block size

Signed-off-by: Fedor Uporov <thisisadrgreenthumb@...il.com>
---
 lib/blkid/getsize.c  | 11 +++++++----
 lib/ext2fs/getsize.c |  9 ++++++---
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/lib/blkid/getsize.c b/lib/blkid/getsize.c
index 8e8eb4c..3d26338 100644
--- a/lib/blkid/getsize.c
+++ b/lib/blkid/getsize.c
@@ -78,12 +78,15 @@ blkid_loff_t blkid_get_dev_size(int fd)
 	unsigned long long size64;
 	blkid_loff_t high, low;
 
-#ifdef DKIOCGETBLOCKCOUNT	/* For Apple Darwin */
-	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {
+#if defined DKIOCGETBLOCKCOUNT && defined DKIOCGETBLOCKSIZE	/* For Apple Darwin */
+	unsigned int size;
+
+	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0 &&
+	    ioctl(fd, DKIOCGETBLOCKSIZE, &size) >= 0) {
 		if (sizeof(blkid_loff_t) < sizeof(unsigned long long) &&
-		    (size64 << 9) > 0xFFFFFFFF)
+		    (size64 * size) > 0xFFFFFFFF)
 			return 0; /* EFBIG */
-		return (blkid_loff_t)size64 << 9;
+		return (blkid_loff_t)size64 * size;
 	}
 #endif
 
diff --git a/lib/ext2fs/getsize.c b/lib/ext2fs/getsize.c
index 89c33d4..68480c6 100644
--- a/lib/ext2fs/getsize.c
+++ b/lib/ext2fs/getsize.c
@@ -151,9 +151,12 @@ errcode_t ext2fs_get_device_size2(const char *file, int blocksize,
 	if (fd < 0)
 		return errno;
 
-#ifdef DKIOCGETBLOCKCOUNT	/* For Apple Darwin */
-	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0) {
-		*retblocks = size64 / (blocksize / 512);
+#if defined DKIOCGETBLOCKCOUNT && defined DKIOCGETBLOCKSIZE	/* For Apple Darwin */
+	unsigned int size;
+
+	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size64) >= 0 &&
+	    ioctl(fd, DKIOCGETBLOCKSIZE, &size) >= 0) {
+		*retblocks = size64 * size / blocksize;
 		goto out;
 	}
 #endif
-- 
2.1.4