Mercurial > illumos > illumos-gate
changeset 13283:4f8f71d21b9f
184 zfs_putpage() optimization
Reviewed by: eric.schrock@delphix.com
Reviewed by: george.wilson@delphix.com
Approved by: gwr@nexenta.com
| author | Garrett D'Amore <garrett@nexenta.com> |
|---|---|
| date | Mon, 07 Feb 2011 14:16:27 -0800 |
| parents | 3f73413df1b2 |
| children | fcadd752253e |
| files | usr/src/uts/common/fs/zfs/zfs_vnops.c |
| diffstat | 1 files changed, 9 insertions(+), 0 deletions(-) [+] |
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--- a/usr/src/uts/common/fs/zfs/zfs_vnops.c Sat Feb 05 21:07:28 2011 -0500 +++ b/usr/src/uts/common/fs/zfs/zfs_vnops.c Mon Feb 07 14:16:27 2011 -0800 @@ -4193,6 +4193,15 @@ ZFS_VERIFY_ZP(zp); /* + * There's nothing to do if no data is cached. + */ + if (!vn_has_cached_data(vp)) { + ASSERT(len == 0); + ZFS_EXIT(zfsvfs); + return (0); + } + + /* * Align this request to the file block size in case we kluster. * XXX - this can result in pretty aggresive locking, which can * impact simultanious read/write access. One option might be