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authorFred Isaman <iisaman@netapp.com>2011-03-23 16:27:51 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-23 22:29:03 +0300
commita861a1e1c398fe34701569fd8ac9225dfe0a9a7e (patch)
treefe28b8cfa4b8a6066ee6f2feeaa2b61e9bfaa0c0 /include/linux/nfs_page.h
parent425eb736cd905181a4dd4dc8d66342a7c7ab2f27 (diff)
downloadlinux-a861a1e1c398fe34701569fd8ac9225dfe0a9a7e.tar.xz
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 <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux/nfs_page.h')
-rw-r--r--include/linux/nfs_page.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 92d54c81f51e..8023e4e25133 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -33,11 +33,15 @@ enum {
PG_CLEAN,
PG_NEED_COMMIT,
PG_NEED_RESCHED,
+ PG_PNFS_COMMIT,
};
struct nfs_inode;
struct nfs_page {
- struct list_head wb_list; /* Defines state of page: */
+ union {
+ struct list_head wb_list; /* Defines state of page: */
+ struct pnfs_layout_segment *wb_commit_lseg; /* Used when PG_PNFS_COMMIT set */
+ };
struct page *wb_page; /* page to read in/write out */
struct nfs_open_context *wb_context; /* File state context info */
struct nfs_lock_context *wb_lock_context; /* lock context info */