Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-pa0-f53.google.com ([209.85.220.53]:56470 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753784AbbANQpp (ORCPT ); Wed, 14 Jan 2015 11:45:45 -0500 Received: by mail-pa0-f53.google.com with SMTP id kq14so11496927pab.12 for ; Wed, 14 Jan 2015 08:45:45 -0800 (PST) From: Tom Haynes To: Trond Myklebust Cc: Linux NFS Mailing list Subject: [PATCH v4 27/50] nfs41: send layoutreturn in last put_lseg Date: Wed, 14 Jan 2015 08:44:33 -0800 Message-Id: <1421253896-73106-28-git-send-email-loghyr@primarydata.com> In-Reply-To: <1421253896-73106-1-git-send-email-loghyr@primarydata.com> References: <1421253896-73106-1-git-send-email-loghyr@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Peng Tao If current lseg is the last lseg marked with NFS_LSEG_LAYOUTRETURN, send layoutreturn. Signed-off-by: Peng Tao Signed-off-by: Tom Haynes --- fs/nfs/pnfs.c | 38 +++++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 853b544..e9acfcf 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -50,6 +50,10 @@ static DEFINE_SPINLOCK(pnfs_spinlock); */ static LIST_HEAD(pnfs_modules_tbl); +static int +pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid, + enum pnfs_iomode iomode); + /* Return the registered pnfs layout driver module matching given id */ static struct pnfs_layoutdriver_type * find_pnfs_driver_locked(u32 id) @@ -337,6 +341,29 @@ pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); } +/* Return true if layoutreturn is needed */ +static bool +pnfs_layout_need_return(struct pnfs_layout_hdr *lo, + struct pnfs_layout_segment *lseg, + nfs4_stateid *stateid, enum pnfs_iomode *iomode) +{ + struct pnfs_layout_segment *s; + + if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) + return false; + + list_for_each_entry(s, &lo->plh_segs, pls_list) + if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) + return false; + + *stateid = lo->plh_stateid; + *iomode = lo->plh_return_iomode; + /* decreased in pnfs_send_layoutreturn() */ + lo->plh_block_lgets++; + lo->plh_return_iomode = 0; + return true; +} + void pnfs_put_lseg(struct pnfs_layout_segment *lseg) { @@ -352,11 +379,20 @@ pnfs_put_lseg(struct pnfs_layout_segment *lseg) lo = lseg->pls_layout; inode = lo->plh_inode; if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { + bool need_return; + nfs4_stateid stateid; + enum pnfs_iomode iomode; + pnfs_get_layout_hdr(lo); pnfs_layout_remove_lseg(lo, lseg); + need_return = pnfs_layout_need_return(lo, lseg, + &stateid, &iomode); spin_unlock(&inode->i_lock); pnfs_free_lseg(lseg); - pnfs_put_layout_hdr(lo); + if (need_return) + pnfs_send_layoutreturn(lo, stateid, iomode); + else + pnfs_put_layout_hdr(lo); } } EXPORT_SYMBOL_GPL(pnfs_put_lseg); -- 1.9.3