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authorWeston Andros Adamson <dros@primarydata.com>2014-07-11 10:20:45 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-07-12 16:51:41 -0400
commit17089a29a25a3bfe8d14520cd866b7d635ffe5ba (patch)
tree9f95e42cf5a06bd36089d7f81f47d23ba2b6530d
parent74adf83f5d7720925499b4938f930591f947b660 (diff)
downloadop-kernel-dev-17089a29a25a3bfe8d14520cd866b7d635ffe5ba.zip
op-kernel-dev-17089a29a25a3bfe8d14520cd866b7d635ffe5ba.tar.gz
nfs: mark nfs_page reqs with flag for extra ref
Change the use of PG_INODE_REF - set it when taking extra reference on subrequests and take care to only release once for each request. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/pagelist.c4
-rw-r--r--fs/nfs/write.c8
2 files changed, 9 insertions, 3 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index b6ee3a6..7368b21 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -251,8 +251,10 @@ nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
/* grab extra ref if head request has extra ref from
* the write/commit path to handle handoff between write
* and commit lists */
- if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags))
+ if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) {
+ set_bit(PG_INODE_REF, &req->wb_flags);
kref_get(&req->wb_kref);
+ }
}
}
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 98ff061..8e5745a 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -448,7 +448,9 @@ static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
set_page_private(req->wb_page, (unsigned long)req);
}
nfsi->npages++;
- set_bit(PG_INODE_REF, &req->wb_flags);
+ /* this a head request for a page group - mark it as having an
+ * extra reference so sub groups can follow suit */
+ WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
kref_get(&req->wb_kref);
spin_unlock(&inode->i_lock);
}
@@ -474,7 +476,9 @@ static void nfs_inode_remove_request(struct nfs_page *req)
nfsi->npages--;
spin_unlock(&inode->i_lock);
}
- nfs_release_request(req);
+
+ if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
+ nfs_release_request(req);
}
static void
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