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From d74f2e031418fb877c97c86a9c6b58eb30a4592c Mon Sep 17 00:00:00 2001
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From: Hongxu Jia <hongxu.jia@windriver.com>
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Date: Tue, 21 Jul 2020 18:25:03 -0700
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Subject: [PATCH 10/46] mke2fs: fix up check for hardlinks always false if
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inode > 0xFFFFFFFF
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Content-Type: text/plain
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While file has a large inode number (> 0xFFFFFFFF), mkfs.ext4 could
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not parse hardlink correctly.
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Prepare three hardlink files for mkfs.ext4
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$ ls -il rootfs_ota/a rootfs_ota/boot/b rootfs_ota/boot/c
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11026675846 -rw-r--r-- 3 hjia users 0 Jul 20 17:44 rootfs_ota/a
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11026675846 -rw-r--r-- 3 hjia users 0 Jul 20 17:44 rootfs_ota/boot/b
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11026675846 -rw-r--r-- 3 hjia users 0 Jul 20 17:44 rootfs_ota/boot/c
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$ truncate -s 1M rootfs_ota.ext4
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$ mkfs.ext4 -F -i 8192 rootfs_ota.ext4 -L otaroot -U fd5f8768-c779-4dc9-adde-165a3d863349 -d rootfs_ota
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$ mkdir mnt && sudo mount rootfs_ota.ext4 mnt
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$ ls -il mnt/a mnt/boot/b mnt/boot/c
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12 -rw-r--r-- 1 hjia users 0 Jul 20 17:44 mnt/a
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14 -rw-r--r-- 1 hjia users 0 Jul 20 17:44 mnt/boot/b
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15 -rw-r--r-- 1 hjia users 0 Jul 20 17:44 mnt/boot/c
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After applying this fix
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$ ls -il mnt/a mnt/boot/b mnt/boot/c
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12 -rw-r--r-- 3 hjia users 0 Jul 20 17:44 mnt/a
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12 -rw-r--r-- 3 hjia users 0 Jul 20 17:44 mnt/boot/b
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12 -rw-r--r-- 3 hjia users 0 Jul 20 17:44 mnt/boot/c
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Since commit [382ed4a1 e2fsck: use proper types for variables][1]
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applied, it used ext2_ino_t instead of ino_t for referencing inode
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numbers, but the type of is_hardlink's `ino' should not be instead,
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The ext2_ino_t is 32bit, if inode > 0xFFFFFFFF, its value will be
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truncated.
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Add a debug printf to show the value of inode, when it check for hardlink
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files, it will always return false if inode > 0xFFFFFFFF
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|--- a/misc/create_inode.c
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|+++ b/misc/create_inode.c
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|@@ -605,6 +605,7 @@ static int is_hardlink(struct hdlinks_s *hdlinks, dev_t dev, ext2_ino_t ino)
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| {
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| int i;
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|+ printf("%s %d, %lX, %lX\n", __FUNCTION__, __LINE__, hdlinks->hdl[i].src_ino, ino);
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| for (i = 0; i < hdlinks->count; i++) {
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| if (hdlinks->hdl[i].src_dev == dev &&
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| hdlinks->hdl[i].src_ino == ino)
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Here is debug message:
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is_hardlink 608, 2913DB886, 913DB886
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The length of ext2_ino_t is 32bit (typedef __u32 __bitwise ext2_ino_t;),
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and ino_t is 64bit on 64bit system (such as x86-64), recover `ino' to ino_t.
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[1] https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/commit/?id=382ed4a1c2b60acb9db7631e86dda207bde6076e
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Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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---
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misc/create_inode.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/misc/create_inode.c b/misc/create_inode.c
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index e8d1df6b..837f3875 100644
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--- a/misc/create_inode.c
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+++ b/misc/create_inode.c
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@@ -601,7 +601,7 @@ out:
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return err;
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}
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-static int is_hardlink(struct hdlinks_s *hdlinks, dev_t dev, ext2_ino_t ino)
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+static int is_hardlink(struct hdlinks_s *hdlinks, dev_t dev, ino_t ino)
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{
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int i;
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--
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2.35.1
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