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authorFred Isaman <iisaman@netapp.com>2011-03-23 13:27:51 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-23 15:29:03 -0400
commita861a1e1c398fe34701569fd8ac9225dfe0a9a7e (patch)
treefe28b8cfa4b8a6066ee6f2feeaa2b61e9bfaa0c0 /fs/nfs/pnfs.h
parent425eb736cd905181a4dd4dc8d66342a7c7ab2f27 (diff)
downloadlinux-stericsson-a861a1e1c398fe34701569fd8ac9225dfe0a9a7e.tar.gz
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 'fs/nfs/pnfs.h')
-rw-r--r--fs/nfs/pnfs.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 6380b9405bcd..5370f1b9aa43 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -74,6 +74,13 @@ struct pnfs_layoutdriver_type {
/* test for nfs page cache coalescing */
int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
+ /* Returns true if layoutdriver wants to divert this request to
+ * driver's commit routine.
+ */
+ bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
+ struct list_head * (*choose_commit_list) (struct nfs_page *req);
+ int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);
+
/*
* Return PNFS_ATTEMPTED to indicate the layout code has attempted
* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
@@ -169,6 +176,51 @@ static inline int pnfs_enabled_sb(struct nfs_server *nfss)
return nfss->pnfs_curr_ld != NULL;
}
+static inline void
+pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
+{
+ if (lseg) {
+ struct pnfs_layoutdriver_type *ld;
+
+ ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
+ if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
+ set_bit(PG_PNFS_COMMIT, &req->wb_flags);
+ req->wb_commit_lseg = get_lseg(lseg);
+ }
+ }
+}
+
+static inline int
+pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
+{
+ if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
+ return PNFS_NOT_ATTEMPTED;
+ return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
+}
+
+static inline struct list_head *
+pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
+{
+ struct list_head *rv;
+
+ if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
+ struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
+
+ set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
+ rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
+ /* matched by ref taken when PG_PNFS_COMMIT is set */
+ put_lseg(req->wb_commit_lseg);
+ } else
+ rv = mds;
+ return rv;
+}
+
+static inline void pnfs_clear_request_commit(struct nfs_page *req)
+{
+ if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
+ put_lseg(req->wb_commit_lseg);
+}
+
#else /* CONFIG_NFS_V4_1 */
static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
@@ -252,6 +304,27 @@ pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino)
pgio->pg_test = NULL;
}
+static inline void
+pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
+{
+}
+
+static inline int
+pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
+{
+ return PNFS_NOT_ATTEMPTED;
+}
+
+static inline struct list_head *
+pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
+{
+ return mds;
+}
+
+static inline void pnfs_clear_request_commit(struct nfs_page *req)
+{
+}
+
#endif /* CONFIG_NFS_V4_1 */
#endif /* FS_NFS_PNFS_H */