|From:||Theodore Ts'o <firstname.lastname@example.org>|
|To:||Ext4 Developers List <email@example.com>|
|Subject:||[PATCH v4 0/3] dioread_nolock patch|
|Date:||Fri, 15 Jan 2010 14:30:09 -0500|
|Cc:||Theodore Ts'o <firstname.lastname@example.org>|
I've worked with Jiaying to ready this patch for submission. It's currently a mount option for maximum safety, but after we do some benchmarking to make sure it doesn't degrade performance for buffered writes, we may want to make this the default. Once really nice side effect of this patch is that it effectively gives us "guarded mode" by default, since the blocks are marked as uninitialized and only converted to be initialized when the I/O has completed for both buffered and direct I/O writes now. This means that we could possibly change the default mode to be data=writeback if the extents feature is enabled, since data=ordered would only needed for safety when writing new old-style indirect blocks. The plan is to merge this for 2.6.34. I've looked this over pretty carefully, but another pair of eyes would be appreciated, especially if we make this the default. Beyond the advantages of being able to use data=writeback, I believe this should be a major win for database workloads. - Ted Theodore Ts'o (3): ext4: mechanical change on dio get_block code in prepare for it to be used by buffer write ext4: use ext4_get_block_write in buffer write ext4: Use direct_IO_no_locking in ext4 dio read. fs/ext4/ext4.h | 28 +++++--- fs/ext4/ext4_jbd2.h | 24 +++++++ fs/ext4/extents.c | 36 +++++----- fs/ext4/fsync.c | 2 +- fs/ext4/inode.c | 192 +++++++++++++++++++++++++++++++++----------------- fs/ext4/super.c | 32 +++++++-- 6 files changed, 217 insertions(+), 97 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to email@example.com More majordomo info at http://vger.kernel.org/majordomo-info.html
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