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author | Anand V. Avati <avati@redhat.com> | 2012-08-19 08:53:23 -0400 |
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committer | Miklos Szeredi <mszeredi@suse.cz> | 2013-01-24 16:21:25 +0100 |
commit | 0b05b18381eea98c9c9ada95629bf659a88c9374 (patch) | |
tree | a6389eaffda03a2e28cb05be242e03ef839fcb91 /init | |
parent | ff7532ca2c631e7e96dcd305a967b610259dc0ea (diff) | |
download | op-kernel-dev-0b05b18381eea98c9c9ada95629bf659a88c9374.zip op-kernel-dev-0b05b18381eea98c9c9ada95629bf659a88c9374.tar.gz |
fuse: implement NFS-like readdirplus support
This patch implements readdirplus support in FUSE, similar to NFS.
The payload returned in the readdirplus call contains
'fuse_entry_out' structure thereby providing all the necessary inputs
for 'faking' a lookup() operation on the spot.
If the dentry and inode already existed (for e.g. in a re-run of ls -l)
then just the inode attributes timeout and dentry timeout are refreshed.
With a simple client->network->server implementation of a FUSE based
filesystem, the following performance observations were made:
Test: Performing a filesystem crawl over 20,000 files with
sh# time ls -lR /mnt
Without readdirplus:
Run 1: 18.1s
Run 2: 16.0s
Run 3: 16.2s
With readdirplus:
Run 1: 4.1s
Run 2: 3.8s
Run 3: 3.8s
The performance improvement is significant as it avoided 20,000 upcalls
calls (lookup). Cache consistency is no worse than what already is.
Signed-off-by: Anand V. Avati <avati@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'init')
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