mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 01:59:02 +00:00
b6fbe7bd5d
This patch series is extracted from http://ftp.de.debian.org/debian/pool/main/g/genext2fs/genext2fs_1.4.1-4.debian.tar.gz The patches are used in Debian for quite a long time, so I assume that this is solid material. At least, my Ubuntu host fsck.ext4 does not bark :-) The goal is to allow building filesystems with larger blocksizes instead of the current default of 1k. This should improve performance and lifetime when the filesystem is stored e.g. on a SD card (on Raspberry Pi/I2SE Duckbill for example) which uses internal flash memory. Writing to flash memory is slow because writing the data of one block results in erasing a whole erase block of the flash memory. Thus it is preferable to align the filesystem block size on a flash device with the erase blocksize, or at least bring it closer to the later one, to avoid unnecessary write amplification. Signed-off-by: Michael Heimpold <mhei@heimpold.de> SVN-Revision: 40921
45 lines
1.8 KiB
Diff
45 lines
1.8 KiB
Diff
Index: genext2fs/genext2fs.c
|
|
===================================================================
|
|
--- genext2fs.orig/genext2fs.c 2011-11-29 17:36:06.000000000 +0100
|
|
+++ genext2fs/genext2fs.c 2011-11-29 17:37:37.000000000 +0100
|
|
@@ -1779,7 +1779,8 @@
|
|
assert(nod->i_block[EXT2_DIND_BLOCK] != 0);
|
|
for(i = 0; i < BLOCKSIZE/4; i++)
|
|
if(nblk > EXT2_IND_BLOCK + BLOCKSIZE/4 + (BLOCKSIZE/4)*i )
|
|
- swap_block(get_blk(fs, ((uint32*)get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]))[i]));
|
|
+ if (((uint32*)get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]))[i])
|
|
+ swap_block(get_blk(fs, ((uint32*)get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]))[i]));
|
|
swap_block(get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]));
|
|
if(nblk <= EXT2_IND_BLOCK + BLOCKSIZE/4 + BLOCKSIZE/4 * BLOCKSIZE/4)
|
|
return;
|
|
@@ -1792,7 +1793,8 @@
|
|
(BLOCKSIZE/4)*(BLOCKSIZE/4) +
|
|
i*(BLOCKSIZE/4)*(BLOCKSIZE/4) +
|
|
j*(BLOCKSIZE/4)) )
|
|
- swap_block(get_blk(fs,b2[j]));
|
|
+ if (b2[j])
|
|
+ swap_block(get_blk(fs,b2[j]));
|
|
else {
|
|
done = 1;
|
|
break;
|
|
@@ -1825,7 +1827,8 @@
|
|
swap_block(get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]));
|
|
for(i = 0; i < BLOCKSIZE/4; i++)
|
|
if(nblk > EXT2_IND_BLOCK + BLOCKSIZE/4 + (BLOCKSIZE/4)*i )
|
|
- swap_block(get_blk(fs, ((uint32*)get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]))[i]));
|
|
+ if (((uint32*)get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]))[i])
|
|
+ swap_block(get_blk(fs, ((uint32*)get_blk(fs, nod->i_block[EXT2_DIND_BLOCK]))[i]));
|
|
if(nblk <= EXT2_IND_BLOCK + BLOCKSIZE/4 + BLOCKSIZE/4 * BLOCKSIZE/4)
|
|
return;
|
|
/* Adding support for triple indirection */
|
|
@@ -1839,7 +1842,8 @@
|
|
(BLOCKSIZE/4)*(BLOCKSIZE/4) +
|
|
i*(BLOCKSIZE/4)*(BLOCKSIZE/4) +
|
|
j*(BLOCKSIZE/4)) )
|
|
- swap_block(get_blk(fs,b2[j]));
|
|
+ if (b2[j])
|
|
+ swap_block(get_blk(fs,b2[j]));
|
|
else {
|
|
done = 1;
|
|
break;
|