2  *  pNFS functions to call and manage layout drivers.
65 /* Return the registered pnfs layout driver module matching given id */
110  * When the server sends a list of layout types, we choose one in the order
143  * Try to set the server's pnfs module to the pnfs layout type specified by id.
144  * Currently only one pNFS layout driver per filesystem is supported.
146  * @ids array of layout types supported by MDS.
188 		printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "  in set_pnfs_layoutdriver()
215 		printk(KERN_ERR "NFS: %s Layout driver must provide "  in pnfs_register_layoutdriver()
248  * pNFS client layout cache
286 	dprintk("%s: freeing layout cache %p\n", __func__, lo);  in pnfs_detach_layout_hdr()
287 	nfsi->layout = NULL;  in pnfs_detach_layout_hdr()
305 			WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");  in pnfs_put_layout_hdr()
372  * Update the seqid of a layout stateid after receiving
390 	lo = NFS_I(inode)->layout;  in nfs4_layout_refresh_old_stateid()
414  * Mark a pnfs_layout_hdr and all associated layout segments as invalid
480 	dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,  in pnfs_layout_io_set_failed()
638  * Compare 2 layout stateid sequence ids, to see which is newer,
669  * @lo: layout header containing the lsegs
674  * Walk the list of lsegs in the layout header, and tear down any that should
744 	lo = nfsi->layout;  in pnfs_destroy_layout()
767 	lo = NFS_I(inode)->layout;  in pnfs_layout_add_bulk_destroy_list()
830 		dprintk("%s freeing layout for inode %lu\n", __func__,  in pnfs_layout_free_bulk_destroy_list()
1056 	lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);  in pnfs_alloc_init_layoutget_args()
1057 	if (!lgp->args.layout.pages) {  in pnfs_alloc_init_layoutget_args()
1061 	lgp->args.layout.pglen = max_pages * PAGE_SIZE;  in pnfs_alloc_init_layoutget_args()
1062 	lgp->res.layoutp = &lgp->args.layout;  in pnfs_alloc_init_layoutget_args()
1093 	size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;  in pnfs_layoutget_free()
1095 	nfs4_free_pages(lgp->args.layout.pages, max_pages);  in pnfs_layoutget_free()
1097 		pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);  in pnfs_layoutget_free()
1110 	list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {  in pnfs_clear_layoutcommit()
1187 	args->layout = lo;  in pnfs_init_layoutreturn_args()
1277  * when the layout segment list is empty.
1279  * Note that a pnfs_layout_hdr can exist with an empty layout segment
1297 	lo = nfsi->layout;  in _pnfs_return_layout()
1300 		dprintk("NFS: %s no layout to return\n", __func__);  in _pnfs_return_layout()
1330 		dprintk("NFS: %s no layout segments to return\n", __func__);  in _pnfs_return_layout()
1355 	lo = NFS_I(inode)->layout;  in pnfs_commit_and_return_layout()
1396 	lo = nfsi->layout;  in pnfs_roc()
1423 		/* Don't return layout if there is open file state */  in pnfs_roc()
1439 		 * doesn't invalidate the layout for us.  in pnfs_roc()
1507 		 * that we need to release the layout  in pnfs_roc_done()
1533 	struct pnfs_layout_hdr *lo = args->layout;  in pnfs_roc_release()
1565         lo = nfsi->layout;  in pnfs_wait_on_layoutreturn()
1575  * Compare two layout segments for sorting into layout cache.
1705 	dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);  in pnfs_find_alloc_layout()
1707 	if (nfsi->layout != NULL)  in pnfs_find_alloc_layout()
1713 	if (likely(nfsi->layout == NULL)) {	/* Won the race? */  in pnfs_find_alloc_layout()
1714 		nfsi->layout = new;  in pnfs_find_alloc_layout()
1719 	pnfs_get_layout_hdr(nfsi->layout);  in pnfs_find_alloc_layout()
1720 	return nfsi->layout;  in pnfs_find_alloc_layout()
1757  * lookup range in layout
1787  * when there are no layout segments. Note that in pnfs_update_layout iomode
1905  * Layout segment is retreived from the server if not cached.
1906  * The appropriate layout segment is referenced and returned to the caller.
1975 	 * If the layout segment list is empty, but there are outstanding  in pnfs_update_layout()
1997 	 * Choose a stateid for the LAYOUTGET. If we don't have a layout  in pnfs_update_layout()
2128 	dprintk("%s: inode %s/%llu pNFS layout segment %s for "  in pnfs_update_layout()
2278 		 * the "current stateid" value, the layout type, or the  in pnfs_parse_lgopen()
2300 		lo = NFS_I(lgp->args.inode)->layout;  in pnfs_parse_lgopen()
2315 			struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;  in nfs4_lgopen_release()
2326 	struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;  in pnfs_layout_process()
2335 	/* Inject layout blob into I/O device driver */  in pnfs_layout_process()
2341 		dprintk("%s: Could not allocate layout: error %ld\n",  in pnfs_layout_process()
2355 		/* We have a completely new layout */  in pnfs_layout_process()
2392  * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2393  * @lo: pointer to layout header
2395  * @return_range: describe layout segment ranges to be returned
2399  * to free the layout segment immediately, or else to mark it for return
2404  * - EBUSY: there are layout segment that are still in use.
2405  * - ENOENT: there are no layout segments that need to be returned.
2454 	lo = NFS_I(inode)->layout;  in pnfs_mark_layout_for_return()
2712 	 * Calculate how many bytes are left in the layout segment  in pnfs_generic_pg_test()
2764  * Called by non rpc-based layout drivers
2890  * Called by non rpc-based layout drivers
3026 	list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {  in pnfs_list_write_lseg()
3061 		nfsi->layout->plh_lwb = end_pos;  in pnfs_set_layoutcommit()
3065 	} else if (end_pos > nfsi->layout->plh_lwb)  in pnfs_set_layoutcommit()
3066 		nfsi->layout->plh_lwb = end_pos;  in pnfs_set_layoutcommit()
3073 		__func__, lseg, nfsi->layout->plh_lwb);  in pnfs_set_layoutcommit()
3092  * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3139 	end_pos = nfsi->layout->plh_lwb;  in pnfs_layoutcommit_inode()
3141 	nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);  in pnfs_layoutcommit_inode()
3142 	data->cred = get_cred(nfsi->layout->plh_lc_cred);  in pnfs_layoutcommit_inode()
3161 			if (end_pos > nfsi->layout->plh_lwb)  in pnfs_layoutcommit_inode()
3162 				nfsi->layout->plh_lwb = end_pos;  in pnfs_layoutcommit_inode()
3223 	if (!NFS_I(inode)->layout) {  in pnfs_report_layoutstat()
3227 	hdr = NFS_I(inode)->layout;  in pnfs_report_layoutstat()