/* * Device operations for the pnfs nfs4 file layout driver. * * Copyright (c) 2014, Primary Data, Inc. All rights reserved. * * Tao Peng <bergwolf@primarydata.com> */ #include <linux/nfs_fs.h>#include <linux/vmalloc.h>#include <linux/module.h>#include <linux/sunrpc/addr.h> #include "../internal.h"#include "../nfs4session.h"#include "flexfilelayout.h" #define NFSDBG_FACILITY		NFSDBG_PNFS_LD static unsigned int dataserver_timeo = NFS_DEF_TCP_RETRANS;static unsigned int dataserver_retrans; static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg); void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds){	if (!IS_ERR_OR_NULL(mirror_ds))		nfs4_put_deviceid_node(&mirror_ds->id_node);} void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds){	nfs4_print_deviceid(&mirror_ds->id_node.deviceid);	nfs4_pnfs_ds_put(mirror_ds->ds);	kfree(mirror_ds->ds_versions);	kfree_rcu(mirror_ds, id_node.rcu);} /* Decode opaque device data and construct new_ds using it */struct nfs4_ff_layout_ds *nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,			    gfp_t gfp_flags){	struct xdr_stream stream;	struct xdr_buf buf;	struct page *scratch;	struct list_head dsaddrs;	struct nfs4_pnfs_ds_addr *da;	struct nfs4_ff_layout_ds *new_ds = NULL;	struct nfs4_ff_ds_version *ds_versions = NULL;	u32 mp_count;	u32 version_count;	__be32 *p;	int i, ret = -ENOMEM; 	/* set up xdr stream */	scratch = alloc_page(gfp_flags);	if (!scratch)		goto out_err; 	new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);	if (!new_ds)		goto out_scratch; 	nfs4_init_deviceid_node(&new_ds->id_node,				server,				&pdev->dev_id);	INIT_LIST_HEAD(&dsaddrs); 	xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);	xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 	/* multipath count */	p = xdr_inline_decode(&stream, 4);	if (unlikely(!p))		goto out_err_drain_dsaddrs;	mp_count = be32_to_cpup(p);	dprintk("%s: multipath ds count %d\n", __func__, mp_count); 	for (i = 0; i < mp_count; i++) {		/* multipath ds */		da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,					    &stream, gfp_flags);		if (da)			list_add_tail(&da->da_node, &dsaddrs);	}	if (list_empty(&dsaddrs)) {		dprintk("%s: no suitable DS addresses found\n",			__func__);		ret = -ENOMEDIUM;		goto out_err_drain_dsaddrs;	} 	/* version count */	p = xdr_inline_decode(&stream, 4);	if (unlikely(!p))		goto out_err_drain_dsaddrs;	version_count = be32_to_cpup(p);	dprintk("%s: version count %d\n", __func__, version_count); 	ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),			      gfp_flags);	if (!ds_versions)		goto out_scratch; 	for (i = 0; i < version_count; i++) {		/* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +		 * tightly_coupled(4) */		p = xdr_inline_decode(&stream, 20);		if (unlikely(!p))			goto out_err_drain_dsaddrs;		ds_versions[i].version = be32_to_cpup(p++);		ds_versions[i].minor_version = be32_to_cpup(p++);		ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);		ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);		ds_versions[i].tightly_coupled = be32_to_cpup(p); 		if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)			ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;		if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)			ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE; 		/*		 * check for valid major/minor combination.		 * currently we support dataserver which talk:		 *   v3, v4.0, v4.1, v4.2		 */		if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||			(ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {			dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,				i, ds_versions[i].version,				ds_versions[i].minor_version);			ret = -EPROTONOSUPPORT;			goto out_err_drain_dsaddrs;		} 		dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",			__func__, i, ds_versions[i].version,			ds_versions[i].minor_version,			ds_versions[i].rsize,			ds_versions[i].wsize,			ds_versions[i].tightly_coupled);	} 	new_ds->ds_versions = ds_versions;	new_ds->ds_versions_cnt = version_count; 	new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);	if (!new_ds->ds)		goto out_err_drain_dsaddrs; 	/* If DS was already in cache, free ds addrs */	while (!list_empty(&dsaddrs)) {		da = list_first_entry(&dsaddrs,				      struct nfs4_pnfs_ds_addr,				      da_node);		list_del_init(&da->da_node);		kfree(da->da_remotestr);		kfree(da);	} 	__free_page(scratch);	return new_ds; out_err_drain_dsaddrs:	while (!list_empty(&dsaddrs)) {		da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,				      da_node);		list_del_init(&da->da_node);		kfree(da->da_remotestr);		kfree(da);	} 	kfree(ds_versions);out_scratch:	__free_page(scratch);out_err:	kfree(new_ds); 	dprintk("%s ERROR: returning %d\n", __func__, ret);	return NULL;} static void ff_layout_mark_devid_invalid(struct pnfs_layout_segment *lseg,		struct nfs4_deviceid_node *devid){	nfs4_delete_deviceid(devid->ld, devid->nfs_client, &devid->deviceid);	if (!ff_layout_has_available_ds(lseg))		pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,				lseg);} static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,				   struct nfs4_ff_layout_mirror *mirror,				   bool create){	if (mirror == NULL || IS_ERR(mirror->mirror_ds))		goto outerr;	if (mirror->mirror_ds == NULL) {		if (create) {			struct nfs4_deviceid_node *node;			struct pnfs_layout_hdr *lh = lseg->pls_layout;			struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV); 			node = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),					&mirror->devid, lh->plh_lc_cred,					GFP_KERNEL);			if (node)				mirror_ds = FF_LAYOUT_MIRROR_DS(node); 			/* check for race with another call to this function */			if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&			    mirror_ds != ERR_PTR(-ENODEV))				nfs4_put_deviceid_node(node);		} else			goto outerr;	} 	if (IS_ERR(mirror->mirror_ds))		goto outerr; 	if (mirror->mirror_ds->ds == NULL) {		struct nfs4_deviceid_node *devid;		devid = &mirror->mirror_ds->id_node;		ff_layout_mark_devid_invalid(lseg, devid);		return false;	}	return true;outerr:	pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);	return false;} static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,			    u64 offset, u64 length){	u64 end; 	end = max_t(u64, pnfs_end_offset(err->offset, err->length),		    pnfs_end_offset(offset, length));	err->offset = min_t(u64, err->offset, offset);	err->length = end - err->offset;} static intff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,		const struct nfs4_ff_layout_ds_err *e2){	int ret; 	if (e1->opnum != e2->opnum)		return e1->opnum < e2->opnum ? -1 : 1;	if (e1->status != e2->status)		return e1->status < e2->status ? -1 : 1;	ret = memcmp(e1->stateid.data, e2->stateid.data,			sizeof(e1->stateid.data));	if (ret != 0)		return ret;	ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));	if (ret != 0)		return ret;	if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)		return -1;	if (e1->offset > pnfs_end_offset(e2->offset, e2->length))		return 1;	/* If ranges overlap or are contiguous, they are the same */	return 0;} static voidff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,			      struct nfs4_ff_layout_ds_err *dserr){	struct nfs4_ff_layout_ds_err *err, *tmp;	struct list_head *head = &flo->error_list;	int match; 	/* Do insertion sort w/ merges */	list_for_each_entry_safe(err, tmp, &flo->error_list, list) {		match = ff_ds_error_match(err, dserr);		if (match < 0)			continue;		if (match > 0) {			/* Add entry "dserr" _before_ entry "err" */			head = &err->list;			break;		}		/* Entries match, so merge "err" into "dserr" */		extend_ds_error(dserr, err->offset, err->length);		list_replace(&err->list, &dserr->list);		kfree(err);		return;	} 	list_add_tail(&dserr->list, head);} int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,			     struct nfs4_ff_layout_mirror *mirror, u64 offset,			     u64 length, int status, enum nfs_opnum4 opnum,			     gfp_t gfp_flags){	struct nfs4_ff_layout_ds_err *dserr; 	if (status == 0)		return 0; 	if (mirror->mirror_ds == NULL)		return -EINVAL; 	dserr = kmalloc(sizeof(*dserr), gfp_flags);	if (!dserr)		return -ENOMEM; 	INIT_LIST_HEAD(&dserr->list);	dserr->offset = offset;	dserr->length = length;	dserr->status = status;	dserr->opnum = opnum;	nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);	memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,	       NFS4_DEVICEID4_SIZE); 	spin_lock(&flo->generic_hdr.plh_inode->i_lock);	ff_layout_add_ds_error_locked(flo, dserr);	spin_unlock(&flo->generic_hdr.plh_inode->i_lock); 	return 0;} static struct rpc_cred *ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode){	struct rpc_cred *cred, __rcu **pcred; 	if (iomode == IOMODE_READ)		pcred = &mirror->ro_cred;	else		pcred = &mirror->rw_cred; 	rcu_read_lock();	do {		cred = rcu_dereference(*pcred);		if (!cred)			break; 		cred = get_rpccred_rcu(cred);	} while(!cred);	rcu_read_unlock();	return cred;} struct nfs_fh *nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx){	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);	struct nfs_fh *fh = NULL; 	if (!ff_layout_mirror_valid(lseg, mirror, false)) {		pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",			__func__, mirror_idx);		goto out;	} 	/* FIXME: For now assume there is only 1 version available for the DS */	fh = &mirror->fh_versions[0];out:	return fh;} /** * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call * @lseg: the layout segment we're operating on * @ds_idx: index of the DS to use * @fail_return: return layout on connect failure? * * Try to prepare a DS connection to accept an RPC call. This involves * selecting a mirror to use and connecting the client to it if it's not * already connected. * * Since we only need a single functioning mirror to satisfy a read, we don't * want to return the layout if there is one. For writes though, any down * mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish * between the two cases. * * Returns a pointer to a connected DS object on success or NULL on failure. */struct nfs4_pnfs_ds *nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,			  bool fail_return){	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);	struct nfs4_pnfs_ds *ds = NULL;	struct nfs4_deviceid_node *devid;	struct inode *ino = lseg->pls_layout->plh_inode;	struct nfs_server *s = NFS_SERVER(ino);	unsigned int max_payload;	int status; 	if (!ff_layout_mirror_valid(lseg, mirror, true)) {		pr_err_ratelimited("NFS: %s: No data server for offset index %d\n",			__func__, ds_idx);		goto out;	} 	devid = &mirror->mirror_ds->id_node;	if (ff_layout_test_devid_unavailable(devid))		goto out_fail; 	ds = mirror->mirror_ds->ds;	/* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */	smp_rmb();	if (ds->ds_clp)		goto out; 	/* FIXME: For now we assume the server sent only one version of NFS	 * to use for the DS.	 */	status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,			     dataserver_retrans,			     mirror->mirror_ds->ds_versions[0].version,			     mirror->mirror_ds->ds_versions[0].minor_version); 	/* connect success, check rsize/wsize limit */	if (!status) {		max_payload =			nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),				       NULL);		if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)			mirror->mirror_ds->ds_versions[0].rsize = max_payload;		if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)			mirror->mirror_ds->ds_versions[0].wsize = max_payload;		goto out;	}out_fail:	ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),				 mirror, lseg->pls_range.offset,				 lseg->pls_range.length, NFS4ERR_NXIO,				 OP_ILLEGAL, GFP_NOIO);	if (fail_return || !ff_layout_has_available_ds(lseg))		pnfs_error_mark_layout_for_return(ino, lseg);	ds = NULL;out:	return ds;} struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,		      struct rpc_cred *mdscred){	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);	struct rpc_cred *cred; 	if (mirror) {		cred = ff_layout_get_mirror_cred(mirror, lseg->pls_range.iomode);		if (!cred)			cred = get_rpccred(mdscred);	} else {		cred = get_rpccred(mdscred);	}	return cred;} /*** Find or create a DS rpc client with th MDS server rpc client auth flavor* in the nfs_client cl_ds_clients list.*/struct rpc_clnt *nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,				 struct nfs_client *ds_clp, struct inode *inode){	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 	switch (mirror->mirror_ds->ds_versions[0].version) {	case 3:		/* For NFSv3 DS, flavor is set when creating DS connections */		return ds_clp->cl_rpcclient;	case 4:		return nfs4_find_or_create_ds_client(ds_clp, inode);	default:		BUG();	}} void ff_layout_free_ds_ioerr(struct list_head *head){	struct nfs4_ff_layout_ds_err *err; 	while (!list_empty(head)) {		err = list_first_entry(head,				struct nfs4_ff_layout_ds_err,				list);		list_del(&err->list);		kfree(err);	}} /* called with inode i_lock held */int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head){

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