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fadump: preserve file modification time to help with hardlinking

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With commit fa9201b2 ("fadump: isolate fadump initramfs image within
the default one"), initramfs image gets to hold two images, one for
production kernel boot purpose and the other for capture kernel boot.
Most files are common among the two images. Retain file modification
time to replace duplicate files with hardlinks and save space. Also,
avoid unnecessarily compressing fadump image that is decompressed
immediately anyway.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
This commit is contained in:
Hari Bathini 2022-10-31 15:42:21 +05:30 committed by Coiby Xu
parent 55b0dd03b3
commit f33c99e347
1 changed files with 6 additions and 4 deletions
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10
mkfadumprd
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@ -40,14 +40,16 @@ touch "$MKFADUMPRD_TMPDIR/fadump.initramfs"
ddebug "rebuild fadump initrd: $FADUMP_INITRD $DEFAULT_INITRD $KDUMP_KERNELVER"
# Don't use squash for capture image or default image as it negatively impacts
# compression ratio and increases the size of the initramfs image.
if ! $MKDUMPRD "$FADUMP_INITRD" -i "$MKFADUMPRD_TMPDIR/fadump.initramfs" /etc/fadump.initramfs --omit squash; then
# Don't compress the capture image as uncompressed image is needed immediately.
# Also, early microcode would not be needed here.
if ! $MKDUMPRD "$FADUMP_INITRD" -i "$MKFADUMPRD_TMPDIR/fadump.initramfs" /etc/fadump.initramfs --omit squash --no-compress --no-early-microcode; then
perror_exit "mkfadumprd: failed to build image with dump capture support"
fi
### Unpack the initramfs having dump capture capability
### Unpack the initramfs having dump capture capability retaining previous file modification time.
# This helps in saving space by hardlinking identical files.
mkdir -p "$MKFADUMPRD_TMPDIR/fadumproot"
if ! (pushd "$MKFADUMPRD_TMPDIR/fadumproot" > /dev/null && lsinitrd --unpack "$FADUMP_INITRD" &&
popd > /dev/null); then
if ! cpio -id --preserve-modification-time --quiet -D "$MKFADUMPRD_TMPDIR/fadumproot" < "$FADUMP_INITRD"; then
derror "mkfadumprd: failed to unpack '$MKFADUMPRD_TMPDIR'"
exit 1
fi