From a861a1e1c398fe34701569fd8ac9225dfe0a9a7e Mon Sep 17 00:00:00 2001 From: Fred Isaman Date: Wed, 23 Mar 2011 13:27:51 +0000 Subject: NFSv4.1: add generic layer hooks for pnfs COMMIT We create three major hooks for the pnfs code. pnfs_mark_request_commit() is called during writeback_done from nfs_mark_request_commit, which gives the driver an opportunity to claim it wants control over commiting a particular req. pnfs_choose_commit_list() is called from nfs_scan_list to choose which list a given req should be added to, based on where we intend to send it for COMMIT. It is up to the driver to have preallocated list headers for each destination it may need. pnfs_commit_list() is how the driver actually takes control, it is used instead of nfs_commit_list(). In order to pass information between the above functions, we create a union in nfs_page to hold a lseg (which is possible because the req is not on any list while in transition), and add some flags to indicate if we need to use the pnfs code. Signed-off-by: Fred Isaman Signed-off-by: Trond Myklebust --- fs/nfs/pagelist.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'fs/nfs/pagelist.c') diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index fd85618149a1..87a593c2b055 100644 --- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -398,6 +398,7 @@ int nfs_scan_list(struct nfs_inode *nfsi, pgoff_t idx_end; int found, i; int res; + struct list_head *list; res = 0; if (npages == 0) @@ -418,10 +419,10 @@ int nfs_scan_list(struct nfs_inode *nfsi, idx_start = req->wb_index + 1; if (nfs_set_page_tag_locked(req)) { kref_get(&req->wb_kref); - nfs_list_remove_request(req); radix_tree_tag_clear(&nfsi->nfs_page_tree, req->wb_index, tag); - nfs_list_add_request(req, dst); + list = pnfs_choose_commit_list(req, dst); + nfs_list_add_request(req, list); res++; if (res == INT_MAX) goto out; -- cgit v1.2.3