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| author | Weston Andros Adamson <dros@primarydata.com> | 2014-07-11 18:20:45 +0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2014-07-13 00:51:41 +0400 |
| commit | 17089a29a25a3bfe8d14520cd866b7d635ffe5ba (patch) | |
| tree | 9f95e42cf5a06bd36089d7f81f47d23ba2b6530d /fs/nfs | |
| parent | 74adf83f5d7720925499b4938f930591f947b660 (diff) | |
| download | linux-17089a29a25a3bfe8d14520cd866b7d635ffe5ba.tar.xz | |
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>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/pagelist.c | 4 | ||||
| -rw-r--r-- | fs/nfs/write.c | 8 |
2 files changed, 9 insertions, 3 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index b6ee3a6ee96d..7368b2130a41 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 98ff061ccaf3..8e5745a4deff 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 |