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Meta: Tune default QEMU disk size

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Having lots of small files in Base/ may require more inodes in the
ext2 filesystem than the format utility sets aside by default. Let's
make a more educated guess since we have a rough idea of how many
inodes we need by counting files and directories.
This commit is contained in:
Jean-Baptiste Boric 2021-08-07 11:02:39 +02:00 • committed by Gunnar Beutner
parent 23a8cd1021
commit f641cc6470
Notes: sideshowbarker 2024-07-18 07:02:52 +09:00
1 changed files with 23 additions and 11 deletions
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34
Meta/build-image-qemu.sh
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@ -33,16 +33,28 @@ PATH="$SCRIPT_DIR/../Toolchain/Local/i686/bin:$PATH"
disk_usage() {
# shellcheck disable=SC2003
if [ "$(uname -s)" = "Darwin" ]; then
expr "$(du -sk "$1" | cut -f1)" / 1024
expr "$(du -sk "$1" | cut -f1)"
else
expr "$(du -sk --apparent-size "$1" | cut -f1)" / 1024
expr "$(du -sk --apparent-size "$1" | cut -f1)"
fi
}
DISK_SIZE=$(($(disk_usage "$SERENITY_SOURCE_DIR/Base") + $(disk_usage Root) + 500))
DISK_SIZE=${DISK_SIZE:-600}
DISK_SIZE_BYTES=$((DISK_SIZE * 1024 * 1024))
unset DISK_SIZE
inode_usage() {
find "$1" | wc -l
}
INODE_SIZE=128
INODE_COUNT=$(($(inode_usage "$SERENITY_SOURCE_DIR/Base") + $(inode_usage Root)))
DISK_SIZE_BYTES=$((($(disk_usage "$SERENITY_SOURCE_DIR/Base") + $(disk_usage Root) + INODE_COUNT) * 1024))
# Try to use heuristics to guess a good disk size and inode count.
# The disk must notably fit:
# * Data blocks (for both files and directories),
# * Indirect/doubly indirect/triply indirect blocks,
# * Inodes and block bitmaps for each block group,
# * Plenty of extra free space and free inodes.
DISK_SIZE_BYTES=$(((DISK_SIZE_BYTES + (INODE_COUNT * INODE_SIZE * 2)) * 3))
INODE_COUNT=$((INODE_COUNT * 7))
USE_EXISTING=0
@ -85,15 +97,15 @@ if [ $USE_EXISTING -ne 1 ]; then
if [ "$(uname -s)" = "OpenBSD" ]; then
VND=$(vnconfig _disk_image)
(echo "e 0"; echo 83; echo n; echo 0; echo "*"; echo "quit") | fdisk -e "$VND"
newfs_ext2fs -D 128 "/dev/r${VND}i" || die "could not create filesystem"
newfs_ext2fs -D $INODE_SIZE -n $INODE_COUNT "/dev/r${VND}i" || die "could not create filesystem"
elif [ "$(uname -s)" = "FreeBSD" ]; then
MD=$(mdconfig _disk_image)
mke2fs -q -I 128 _disk_image || die "could not create filesystem"
mke2fs -q -I $INODE_SIZE -N $INODE_COUNT _disk_image || die "could not create filesystem"
else
if [ -x /sbin/mke2fs ]; then
/sbin/mke2fs -q -I 128 _disk_image || die "could not create filesystem"
/sbin/mke2fs -q -I $INODE_SIZE -N $INODE_COUNT _disk_image || die "could not create filesystem"
else
mke2fs -q -I 128 _disk_image || die "could not create filesystem"
mke2fs -q -I $INODE_SIZE -N $INODE_COUNT _disk_image || die "could not create filesystem"
fi
fi
echo "done"
@ -149,7 +161,7 @@ if [ $use_genext2fs = 1 ]; then
# regenerate new image, since genext2fs is unable to reuse the previously written image.
# genext2fs is very slow in generating big images, so I use a smaller image here. size can be updated
# if it's not enough.
# not using "-i 128" since it hangs. Serenity handles whatever default this uses instead.
# not using "-I $INODE_SIZE" since it hangs. Serenity handles whatever default this uses instead.
genext2fs -B 4096 -b $((DISK_SIZE_BYTES / 4096)) -d mnt _disk_image || die "try increasing image size (genext2fs -b)"
# if using docker with shared mount, file is created as root, so make it writable for users
chmod 0666 _disk_image