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| author | Peter Korsgaard <jacmet@sunsite.dk> | 2010-12-30 23:10:21 +0100 |
|---|---|---|
| committer | Peter Korsgaard <jacmet@sunsite.dk> | 2010-12-30 23:10:21 +0100 |
| commit | eeea3ea6a88a8f1c7511abf0b429297a562e7d30 (patch) | |
| tree | 261405a6c1f2c42d9f876c7b473051fa2f58d8e6 /fs/ext2 | |
| parent | f3931ca1a159530026adc3964fbb173f8113aef6 (diff) | |
genext2fs.sh: improve number of blocks calculation
Closes #2929
Instead of just adding a fixed amount to the blocks used, try to
estimate the real space needed according to the filesystem structure
(bitmaps, inodes, blocks).
The side effect of this is that we no longer significantly overestimate
the size needed for small file systems.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Diffstat (limited to 'fs/ext2')
| -rwxr-xr-x | fs/ext2/genext2fs.sh | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/fs/ext2/genext2fs.sh b/fs/ext2/genext2fs.sh index b315ec30a..7a518aea7 100755 --- a/fs/ext2/genext2fs.sh +++ b/fs/ext2/genext2fs.sh @@ -10,24 +10,11 @@ while getopts x:d:D:b:i:N:m:g:e:zfqUPhVv f do case $f in b) CALC_BLOCKS=0 ;; - N) CALC_INODES=0 ;; + N) CALC_INODES=0; INODES=$OPTARG ;; d) TARGET_DIR=$OPTARG ;; esac done -# calculate needed blocks -if [ $CALC_BLOCKS -eq 1 ]; -then - BLOCKS=$(du -s -c -k $TARGET_DIR | grep total | sed -e "s/total//") - if [ $BLOCKS -ge 20000 ]; - then - BLOCKS=$(expr $BLOCKS + 16384) - else - BLOCKS=$(expr $BLOCKS + 2400) - fi - set -- $@ -b $BLOCKS -fi - # calculate needed inodes if [ $CALC_INODES -eq 1 ]; then @@ -36,4 +23,14 @@ then set -- $@ -N $INODES fi +# calculate needed blocks +if [ $CALC_BLOCKS -eq 1 ]; +then + # size ~= superblock, block+inode bitmaps, inodes (8 per block), blocks + # we scale inodes / blocks with 10% to compensate for bitmaps size + slack + BLOCKS=$(du -s -c -k $TARGET_DIR | grep total | sed -e "s/total//") + BLOCKS=$(expr 500 + \( $BLOCKS + $INODES / 8 \) \* 11 / 10) + set -- $@ -b $BLOCKS +fi + exec genext2fs $@ |