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NFS: Reduce lock contention in nfs_page_find_head_request()

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Add a lockless check for whether or not the page might be carrying
an existing writeback before we grab the inode->i_lock.

Reported-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2017-07-17 09:30:13 -04:00
parent 6d17d653c9
commit 82749dd4ef
1 changed files with 5 additions and 3 deletions
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8
fs/nfs/write.c
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@ -190,9 +190,11 @@ static struct nfs_page *nfs_page_find_head_request(struct page *page)
struct inode *inode = page_file_mapping(page)->host;
struct nfs_page *req = NULL;
spin_lock(&inode->i_lock);
req = nfs_page_find_head_request_locked(NFS_I(inode), page);
spin_unlock(&inode->i_lock);
if (PagePrivate(page) || PageSwapCache(page)) {
spin_lock(&inode->i_lock);
req = nfs_page_find_head_request_locked(NFS_I(inode), page);
spin_unlock(&inode->i_lock);
}
return req;
}