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| author | John Crispin <john@openwrt.org> | 2014-06-02 12:43:46 +0000 |
|---|---|---|
| committer | John Crispin <john@openwrt.org> | 2014-06-02 12:43:46 +0000 |
| commit | b6fbe7bd5da6548323030ced25582d90c7a99cc7 (patch) | |
| tree | 3b6bfae0ed3612370256faadda43848af26c85c8 /tools/genext2fs/patches/400-byteswap_fix.patch | |
| parent | 7ba5188fe94b667cc17aeb010626c5d245a92aca (diff) | |
| download | upstream-b6fbe7bd5da6548323030ced25582d90c7a99cc7.tar.gz upstream-b6fbe7bd5da6548323030ced25582d90c7a99cc7.tar.bz2 upstream-b6fbe7bd5da6548323030ced25582d90c7a99cc7.zip | |
tools: genext2fs: add support for blocksize != 1024
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
Diffstat (limited to 'tools/genext2fs/patches/400-byteswap_fix.patch')
| -rw-r--r-- | tools/genext2fs/patches/400-byteswap_fix.patch | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tools/genext2fs/patches/400-byteswap_fix.patch b/tools/genext2fs/patches/400-byteswap_fix.patch new file mode 100644 index 0000000000..7b3c00b5ee --- /dev/null +++ b/tools/genext2fs/patches/400-byteswap_fix.patch @@ -0,0 +1,44 @@ +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; |