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ext4: improve credit estimate for EXT4_SINGLEDATA_TRANS_BLOCKS 

Estimate of 27 credits for allocation of a block in extent based inode
is unnecessarily high. We can easily argue 20 is enough.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
wifi-calibration
Jan Kara 2013-04-09 12:39:26 -04:00 committed by Theodore Ts'o
parent eabe0444df
commit f45a5ef91b
1 changed files with 4 additions and 2 deletions
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6
fs/ext4/ext4_jbd2.h
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@ -29,11 +29,13 @@
* block to complete the transaction.
*
* For extents-enabled fs we may have to allocate and modify up to
* 5 levels of tree + root which are stored in the inode. */
* 5 levels of tree, data block (for each of these we need bitmap + group
* summaries), root which is stored in the inode, sb
*/
#define EXT4_SINGLEDATA_TRANS_BLOCKS(sb) \
(EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS) \
? 27U : 8U)
? 20U : 8U)
/* Extended attribute operations touch at most two data buffers,
* two bitmap buffers, and two group summaries, in addition to the inode