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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-02-04 01:19:38 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-03-08 14:58:30 +0900
commitae191838b0251d73b9d0a7254c6938406f5f6320 (patch)
tree5f2b08f5ab421c3644a988acc5ec7a1c65a631bd /include/linux/nilfs2_fs.h
parent4138ec23820012009aecc2b02856c62872dd3c34 (diff)
downloadlwn-ae191838b0251d73b9d0a7254c6938406f5f6320.tar.gz
lwn-ae191838b0251d73b9d0a7254c6938406f5f6320.zip
nilfs2: optimize rec_len functions
This is a similar change to those in ext2/ext3 codebase (commit 40a063f6691ce937 and a4ae3094869f18e2, respectively). The addition of 64k block capability in the rec_len_from_disk and rec_len_to_disk functions added a bit of math overhead which slows down file create workloads needlessly when the architecture cannot even support 64k blocks. This will cut the corner. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'include/linux/nilfs2_fs.h')
-rw-r--r--include/linux/nilfs2_fs.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index fdcd1bc7f61f..3a65e5aa2d76 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -326,17 +326,21 @@ static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
{
unsigned len = le16_to_cpu(dlen);
+#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
if (len == NILFS_MAX_REC_LEN)
return 1 << 16;
+#endif
return len;
}
static inline __le16 nilfs_rec_len_to_disk(unsigned len)
{
+#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
if (len == (1 << 16))
return cpu_to_le16(NILFS_MAX_REC_LEN);
else if (len > (1 << 16))
BUG();
+#endif
return cpu_to_le16(len);
}