Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  *  Device operations for the pnfs nfs4 file layout driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  Copyright (c) 2002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  The Regents of the University of Michigan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Dean Hildebrand <dhildebz@umich.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  Garth Goodson   <Garth.Goodson@netapp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *  Permission is granted to use, copy, create derivative works, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *  redistribute this software and such derivative works for any purpose,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *  so long as the name of the University of Michigan is not used in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *  any advertising or publicity pertaining to the use or distribution
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *  of this software without specific, written prior authorization. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *  the above copyright notice or any other identification of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *  University of Michigan is included in any copy of any portion of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *  this software, then the disclaimer below must also be included.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *  This software is provided as is, without representation or warranty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *  of any kind either express or implied, including without limitation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *  the implied warranties of merchantability, fitness for a particular
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *  purpose, or noninfringement.  The Regents of the University of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *  Michigan shall not be liable for any damages, including special,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *  indirect, incidental, or consequential damages, with respect to any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *  claim arising out of or in connection with the use of the software,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  *  even if it has been or is hereafter advised of the possibility of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *  such damages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/nfs_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include "../internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include "../nfs4session.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include "filelayout.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define NFSDBG_FACILITY		NFSDBG_PNFS_LD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct nfs4_pnfs_ds *ds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	nfs4_print_deviceid(&dsaddr->id_node.deviceid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	for (i = 0; i < dsaddr->ds_num; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		ds = dsaddr->ds_list[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		if (ds != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			nfs4_pnfs_ds_put(ds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	kfree(dsaddr->stripe_indices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	kfree_rcu(dsaddr, id_node.rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) /* Decode opaque device data and return the result */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) struct nfs4_file_layout_dsaddr *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		gfp_t gfp_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	u32 cnt, num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	u8 *indexp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	__be32 *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	u8 *stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	u8 max_stripe_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct nfs4_file_layout_dsaddr *dsaddr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct xdr_stream stream;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct xdr_buf buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct page *scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct list_head dsaddrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct nfs4_pnfs_ds_addr *da;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	/* set up xdr stream */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	scratch = alloc_page(gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	if (!scratch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	/* Get the stripe count (number of stripe index) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	p = xdr_inline_decode(&stream, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (unlikely(!p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		goto out_err_free_scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	cnt = be32_to_cpup(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	dprintk("%s stripe count  %d\n", __func__, cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		printk(KERN_WARNING "NFS: %s: stripe count %d greater than "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		       "supported maximum %d\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			cnt, NFS4_PNFS_MAX_STRIPE_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		goto out_err_free_scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	/* read stripe indices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	stripe_indices = kcalloc(cnt, sizeof(u8), gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (!stripe_indices)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		goto out_err_free_scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	p = xdr_inline_decode(&stream, cnt << 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (unlikely(!p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		goto out_err_free_stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	indexp = &stripe_indices[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	max_stripe_index = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	for (i = 0; i < cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		*indexp = be32_to_cpup(p++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		max_stripe_index = max(max_stripe_index, *indexp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		indexp++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	/* Check the multipath list count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	p = xdr_inline_decode(&stream, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (unlikely(!p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		goto out_err_free_stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	num = be32_to_cpup(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	dprintk("%s ds_num %u\n", __func__, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (num > NFS4_PNFS_MAX_MULTI_CNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		printk(KERN_WARNING "NFS: %s: multipath count %d greater than "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			"supported maximum %d\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			num, NFS4_PNFS_MAX_MULTI_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		goto out_err_free_stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	/* validate stripe indices are all < num */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (max_stripe_index >= num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		printk(KERN_WARNING "NFS: %s: stripe index %u >= num ds %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			__func__, max_stripe_index, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		goto out_err_free_stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	dsaddr = kzalloc(sizeof(*dsaddr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			(sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (!dsaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		goto out_err_free_stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	dsaddr->stripe_count = cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	dsaddr->stripe_indices = stripe_indices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	stripe_indices = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	dsaddr->ds_num = num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	INIT_LIST_HEAD(&dsaddrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	for (i = 0; i < dsaddr->ds_num; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		int j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		u32 mp_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		p = xdr_inline_decode(&stream, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (unlikely(!p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			goto out_err_free_deviceid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		mp_count = be32_to_cpup(p); /* multipath count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		for (j = 0; j < mp_count; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 						    &stream, gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			if (da)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				list_add_tail(&da->da_node, &dsaddrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		if (list_empty(&dsaddrs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			dprintk("%s: no suitable DS addresses found\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				__func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			goto out_err_free_deviceid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		dsaddr->ds_list[i] = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		if (!dsaddr->ds_list[i])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			goto out_err_drain_dsaddrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		/* If DS was already in cache, free ds addrs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		while (!list_empty(&dsaddrs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			da = list_first_entry(&dsaddrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 					      struct nfs4_pnfs_ds_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 					      da_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			list_del_init(&da->da_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			kfree(da->da_remotestr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			kfree(da);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	__free_page(scratch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	return dsaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) out_err_drain_dsaddrs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	while (!list_empty(&dsaddrs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				      da_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		list_del_init(&da->da_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		kfree(da->da_remotestr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		kfree(da);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) out_err_free_deviceid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	nfs4_fl_free_deviceid(dsaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/* stripe_indicies was part of dsaddr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	goto out_err_free_scratch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) out_err_free_stripe_indices:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	kfree(stripe_indices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) out_err_free_scratch:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	__free_page(scratch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	dprintk("%s ERROR: returning NULL\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	nfs4_put_deviceid_node(&dsaddr->id_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * Then: ((res + fsi) % dsaddr->stripe_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) u32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	u64 tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	tmp = offset - flseg->pattern_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	do_div(tmp, flseg->stripe_unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	tmp += flseg->first_stripe_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return do_div(tmp, flseg->dsaddr->stripe_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) u32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct nfs_fh *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	u32 i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (flseg->stripe_type == STRIPE_SPARSE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		if (flseg->num_fh == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		else if (flseg->num_fh == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			/* Use the MDS OPEN fh set in nfs_read_rpcsetup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			i = nfs4_fl_calc_ds_index(lseg, j);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		i = j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	return flseg->fh_array[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /* Upon return, either ds is connected, or ds is NULL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct nfs4_pnfs_ds *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	struct nfs4_pnfs_ds *ret = ds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	if (ds == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			__func__, ds_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		pnfs_generic_mark_devid_invalid(devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	smp_rmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (ds->ds_clp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		goto out_test_devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			     dataserver_retrans, 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			     s->nfs_client->cl_minorversion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	if (status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		nfs4_mark_deviceid_unavailable(devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) out_test_devid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (ret->ds_clp == NULL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	    filelayout_test_devid_unavailable(devid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) module_param(dataserver_retrans, uint, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) MODULE_PARM_DESC(dataserver_retrans, "The  number of times the NFSv4.1 client "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			"retries a request before it attempts further "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 			" recovery  action.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) module_param(dataserver_timeo, uint, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			"NFSv4.1  client  waits for a response from a "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			" data server before it retries an NFS request.");