On 08/05/2013 10:42 AM, John R Pierce wrote:
On 8/5/2013 1:01 AM, KONDO Mitsumasa wrote:
When we open file, ext3 or ext4 file system seems to sequential search
inode for opening file in file directory.

no, ext3/4 uses H-tree structures to search directories over 1 block
long quite efficiently.

And the Linux dentry cache is rather aggressive, so most of the time, only the in-memory hash table will be consulted. (The dentry cache only gets flushed on severe memory pressure.)

--
Florian Weimer / Red Hat Product Security Team


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