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authorJan Kara <jack@suse.cz>2013-04-09 12:39:26 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-04-09 12:39:26 -0400
commitf45a5ef91bef7e02149a216ed6dc3fcdd8b38268 (patch)
treef42e693444d3f2456a7c0a002cffdc1f31f6eeea
parenteabe0444df90b0cdfa7fdc4f0b4b253f0a498ff7 (diff)
downloadlinux-f45a5ef91bef7e02149a216ed6dc3fcdd8b38268.tar.bz2
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>
-rw-r--r--fs/ext4/ext4_jbd2.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index aeed0bac693b..c8c6885406db 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -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