tree a0f0ce2e044f8a75009e94d5f788b45a3948bbe3
parent ee12b630687d510f6f4b6d4acdc4e267fd4adeda
author Mingming Cao <cmm@us.ibm.com> 1219198563 -0400
committer Theodore Ts'o <tytso@mit.edu> 1219198563 -0400

ext4: journal credits reservation fixes for DIO, fallocate

DIO and fallocate credit calculation is different than writepage, as
they do start a new journal right for each call to ext4_get_blocks_wrap().
This patch uses the helper function in DIO and fallocate case, passing
a flag indicating that the modified data are contigous thus could account
less indirect/index blocks.

This patch also fixed the journal credit reservation for direct I/O
(DIO).  Previously the estimated credits for DIO only was calculated for
non-extent files, which was not enough if the file is extent-based.

Also fixed was fallocate double-counting credits for modifying the the
superblock.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>