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| author | Takashi Sato | 2008-01-29 05:58:27 +0100 |
|---|---|---|
| committer | Theodore Ts'o | 2008-01-29 05:58:27 +0100 |
| commit | afc7cbca5bfd556c3e12d3acefbee5ab0cbd4670 (patch) | |
| tree | 90e6daf4a3f41433221d9cb8d7ce909cde0d62d1 /include/linux/ext4_fs.h | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog (diff) | |
| download | kernel-qcow2-linux-afc7cbca5bfd556c3e12d3acefbee5ab0cbd4670.tar.gz kernel-qcow2-linux-afc7cbca5bfd556c3e12d3acefbee5ab0cbd4670.tar.xz kernel-qcow2-linux-afc7cbca5bfd556c3e12d3acefbee5ab0cbd4670.zip | |
ext4: Support large blocksize up to PAGESIZE
This patch set supports large block size(>4k, <=64k) in ext4,
just enlarging the block size limit. But it is NOT possible to have 64kB
blocksize on ext4 without some changes to the directory handling
code. The reason is that an empty 64kB directory block would have a
rec_len == (__u16)2^16 == 0, and this would cause an error to be hit in
the filesystem. The proposed solution is treat 64k rec_len
with a an impossible value like rec_len = 0xffff to handle this.
The Patch-set consists of the following 2 patches.
[1/2] ext4: enlarge blocksize
- Allow blocksize up to pagesize
[2/2] ext4: fix rec_len overflow
- prevent rec_len from overflow with 64KB blocksize
Now on 64k page ppc64 box runs with this patch set we could create a 64k
block size ext4dev, and able to handle empty directory block.
Signed-off-by: Takashi Sato <sho@tnes.nec.co.jp>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Diffstat (limited to 'include/linux/ext4_fs.h')
| -rw-r--r-- | include/linux/ext4_fs.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h index 97dd409d5f4a..dfe4487fc739 100644 --- a/include/linux/ext4_fs.h +++ b/include/linux/ext4_fs.h @@ -73,8 +73,8 @@ * Macro-instructions used to manage several block sizes */ #define EXT4_MIN_BLOCK_SIZE 1024 -#define EXT4_MAX_BLOCK_SIZE 4096 -#define EXT4_MIN_BLOCK_LOG_SIZE 10 +#define EXT4_MAX_BLOCK_SIZE 65536 +#define EXT4_MIN_BLOCK_LOG_SIZE 10 #ifdef __KERNEL__ # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) #else |