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| /linux/fs/ext4/ |
| H A D | ext4_jbd2.h | diff 744692dc059845b2a3022119871846e74d4f6e11 Thu Mar 04 22:14:02 CET 2010 Jiaying Zhang <jiayingz@google.com> ext4: use ext4_get_block_write in buffer write
Allocate uninitialized extent before ext4 buffer write and
convert the extent to initialized after io completes.
The purpose is to make sure an extent can only be marked
initialized after it has been written with new data so
we can safely drop the i_mutex lock in ext4 DIO read without
exposing stale data. This helps to improve multi-thread DIO
read performance on high-speed disks.
Skip the nobh and data=journal mount cases to make things simple for now.
Signed-off-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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