--- /dev/null
+/*
+ * Device operations for the pnfs nfs4 file layout driver.
+ *
+ * Copyright (c) 2002
+ * The Regents of the University of Michigan
+ * All Rights Reserved
+ *
+ * Dean Hildebrand <dhildebz@umich.edu>
+ * Garth Goodson <Garth.Goodson@netapp.com>
+ *
+ * Permission is granted to use, copy, create derivative works, and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the University of Michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. If
+ * the above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * This software is provided as is, without representation or warranty
+ * of any kind either express or implied, including without limitation
+ * the implied warranties of merchantability, fitness for a particular
+ * purpose, or noninfringement. The Regents of the University of
+ * Michigan shall not be liable for any damages, including special,
+ * indirect, incidental, or consequential damages, with respect to any
+ * claim arising out of or in connection with the use of the software,
+ * even if it has been or is hereafter advised of the possibility of
+ * such damages.
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/vmalloc.h>
+
+#include "internal.h"
+#include "nfs4filelayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+/*
+ * Data server cache
+ *
+ * Data servers can be mapped to different device ids.
+ * nfs4_pnfs_ds reference counting
+ * - set to 1 on allocation
+ * - incremented when a device id maps a data server already in the cache.
+ * - decremented when deviceid is removed from the cache.
+ */
+DEFINE_SPINLOCK(nfs4_ds_cache_lock);
+static LIST_HEAD(nfs4_data_server_cache);
+
+/* Debug routines */
+void
+print_ds(struct nfs4_pnfs_ds *ds)
+{
+ if (ds == NULL) {
+ printk("%s NULL device\n", __func__);
+ return;
+ }
+ printk(" ip_addr %x port %hu\n"
+ " ref count %d\n"
+ " client %p\n"
+ " cl_exchange_flags %x\n",
+ ntohl(ds->ds_ip_addr), ntohs(ds->ds_port),
+ atomic_read(&ds->ds_count), ds->ds_clp,
+ ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
+}
+
+void
+print_ds_list(struct nfs4_file_layout_dsaddr *dsaddr)
+{
+ int i;
+
+ ifdebug(FACILITY) {
+ printk("%s dsaddr->ds_num %d\n", __func__,
+ dsaddr->ds_num);
+ for (i = 0; i < dsaddr->ds_num; i++)
+ print_ds(dsaddr->ds_list[i]);
+ }
+}
+
+void print_deviceid(struct nfs4_deviceid *id)
+{
+ u32 *p = (u32 *)id;
+
+ dprintk("%s: device id= [%x%x%x%x]\n", __func__,
+ p[0], p[1], p[2], p[3]);
+}
+
+/* nfs4_ds_cache_lock is held */
+static struct nfs4_pnfs_ds *
+_data_server_lookup_locked(u32 ip_addr, u32 port)
+{
+ struct nfs4_pnfs_ds *ds;
+
+ dprintk("_data_server_lookup: ip_addr=%x port=%hu\n",
+ ntohl(ip_addr), ntohs(port));
+
+ list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) {
+ if (ds->ds_ip_addr == ip_addr &&
+ ds->ds_port == port) {
+ return ds;
+ }
+ }
+ return NULL;
+}
+
+static void
+destroy_ds(struct nfs4_pnfs_ds *ds)
+{
+ dprintk("--> %s\n", __func__);
+ ifdebug(FACILITY)
+ print_ds(ds);
+
+ if (ds->ds_clp)
+ nfs_put_client(ds->ds_clp);
+ kfree(ds);
+}
+
+static void
+nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
+{
+ struct nfs4_pnfs_ds *ds;
+ int i;
+
+ print_deviceid(&dsaddr->deviceid.de_id);
+
+ for (i = 0; i < dsaddr->ds_num; i++) {
+ ds = dsaddr->ds_list[i];
+ if (ds != NULL) {
+ if (atomic_dec_and_lock(&ds->ds_count,
+ &nfs4_ds_cache_lock)) {
+ list_del_init(&ds->ds_node);
+ spin_unlock(&nfs4_ds_cache_lock);
+ destroy_ds(ds);
+ }
+ }
+ }
+ kfree(dsaddr->stripe_indices);
+ kfree(dsaddr);
+}
+
+void
+nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *device)
+{
+ struct nfs4_file_layout_dsaddr *dsaddr =
+ container_of(device, struct nfs4_file_layout_dsaddr, deviceid);
+
+ nfs4_fl_free_deviceid(dsaddr);
+}
+
+static struct nfs4_pnfs_ds *
+nfs4_pnfs_ds_add(struct inode *inode, u32 ip_addr, u32 port)
+{
+ struct nfs4_pnfs_ds *tmp_ds, *ds;
+
+ ds = kzalloc(sizeof(*tmp_ds), GFP_KERNEL);
+ if (!ds)
+ goto out;
+
+ spin_lock(&nfs4_ds_cache_lock);
+ tmp_ds = _data_server_lookup_locked(ip_addr, port);
+ if (tmp_ds == NULL) {
+ ds->ds_ip_addr = ip_addr;
+ ds->ds_port = port;
+ atomic_set(&ds->ds_count, 1);
+ INIT_LIST_HEAD(&ds->ds_node);
+ ds->ds_clp = NULL;
+ list_add(&ds->ds_node, &nfs4_data_server_cache);
+ dprintk("%s add new data server ip 0x%x\n", __func__,
+ ds->ds_ip_addr);
+ } else {
+ kfree(ds);
+ atomic_inc(&tmp_ds->ds_count);
+ dprintk("%s data server found ip 0x%x, inc'ed ds_count to %d\n",
+ __func__, tmp_ds->ds_ip_addr,
+ atomic_read(&tmp_ds->ds_count));
+ ds = tmp_ds;
+ }
+ spin_unlock(&nfs4_ds_cache_lock);
+out:
+ return ds;
+}
+
+/*
+ * Currently only support ipv4, and one multi-path address.
+ */
+static struct nfs4_pnfs_ds *
+decode_and_add_ds(__be32 **pp, struct inode *inode)
+{
+ struct nfs4_pnfs_ds *ds = NULL;
+ char *buf;
+ const char *ipend, *pstr;
+ u32 ip_addr, port;
+ int nlen, rlen, i;
+ int tmp[2];
+ __be32 *r_netid, *r_addr, *p = *pp;
+
+ /* r_netid */
+ nlen = be32_to_cpup(p++);
+ r_netid = p;
+ p += XDR_QUADLEN(nlen);
+
+ /* r_addr */
+ rlen = be32_to_cpup(p++);
+ r_addr = p;
+ p += XDR_QUADLEN(rlen);
+ *pp = p;
+
+ /* Check that netid is "tcp" */
+ if (nlen != 3 || memcmp((char *)r_netid, "tcp", 3)) {
+ dprintk("%s: ERROR: non ipv4 TCP r_netid\n", __func__);
+ goto out_err;
+ }
+
+ /* ipv6 length plus port is legal */
+ if (rlen > INET6_ADDRSTRLEN + 8) {
+ dprintk("%s Invalid address, length %d\n", __func__,
+ rlen);
+ goto out_err;
+ }
+ buf = kmalloc(rlen + 1, GFP_KERNEL);
+ buf[rlen] = '\0';
+ memcpy(buf, r_addr, rlen);
+
+ /* replace the port dots with dashes for the in4_pton() delimiter*/
+ for (i = 0; i < 2; i++) {
+ char *res = strrchr(buf, '.');
+ *res = '-';
+ }
+
+ /* Currently only support ipv4 address */
+ if (in4_pton(buf, rlen, (u8 *)&ip_addr, '-', &ipend) == 0) {
+ dprintk("%s: Only ipv4 addresses supported\n", __func__);
+ goto out_free;
+ }
+
+ /* port */
+ pstr = ipend;
+ sscanf(pstr, "-%d-%d", &tmp[0], &tmp[1]);
+ port = htons((tmp[0] << 8) | (tmp[1]));
+
+ ds = nfs4_pnfs_ds_add(inode, ip_addr, port);
+ dprintk("%s Decoded address and port %s\n", __func__, buf);
+out_free:
+ kfree(buf);
+out_err:
+ return ds;
+}
+
+/* Decode opaque device data and return the result */
+static struct nfs4_file_layout_dsaddr*
+decode_device(struct inode *ino, struct pnfs_device *pdev)
+{
+ int i, dummy;
+ u32 cnt, num;
+ u8 *indexp;
+ __be32 *p = (__be32 *)pdev->area, *indicesp;
+ struct nfs4_file_layout_dsaddr *dsaddr;
+
+ /* Get the stripe count (number of stripe index) */
+ cnt = be32_to_cpup(p++);
+ dprintk("%s stripe count %d\n", __func__, cnt);
+ if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) {
+ printk(KERN_WARNING "%s: stripe count %d greater than "
+ "supported maximum %d\n", __func__,
+ cnt, NFS4_PNFS_MAX_STRIPE_CNT);
+ goto out_err;
+ }
+
+ /* Check the multipath list count */
+ indicesp = p;
+ p += XDR_QUADLEN(cnt << 2);
+ num = be32_to_cpup(p++);
+ dprintk("%s ds_num %u\n", __func__, num);
+ if (num > NFS4_PNFS_MAX_MULTI_CNT) {
+ printk(KERN_WARNING "%s: multipath count %d greater than "
+ "supported maximum %d\n", __func__,
+ num, NFS4_PNFS_MAX_MULTI_CNT);
+ goto out_err;
+ }
+ dsaddr = kzalloc(sizeof(*dsaddr) +
+ (sizeof(struct nfs4_pnfs_ds *) * (num - 1)),
+ GFP_KERNEL);
+ if (!dsaddr)
+ goto out_err;
+
+ dsaddr->stripe_indices = kzalloc(sizeof(u8) * cnt, GFP_KERNEL);
+ if (!dsaddr->stripe_indices)
+ goto out_err_free;
+
+ dsaddr->stripe_count = cnt;
+ dsaddr->ds_num = num;
+
+ memcpy(&dsaddr->deviceid.de_id, &pdev->dev_id, sizeof(pdev->dev_id));
+
+ /* Go back an read stripe indices */
+ p = indicesp;
+ indexp = &dsaddr->stripe_indices[0];
+ for (i = 0; i < dsaddr->stripe_count; i++) {
+ *indexp = be32_to_cpup(p++);
+ if (*indexp >= num)
+ goto out_err_free;
+ indexp++;
+ }
+ /* Skip already read multipath list count */
+ p++;
+
+ for (i = 0; i < dsaddr->ds_num; i++) {
+ int j;
+
+ dummy = be32_to_cpup(p++); /* multipath count */
+ if (dummy > 1) {
+ printk(KERN_WARNING
+ "%s: Multipath count %d not supported, "
+ "skipping all greater than 1\n", __func__,
+ dummy);
+ }
+ for (j = 0; j < dummy; j++) {
+ if (j == 0) {
+ dsaddr->ds_list[i] = decode_and_add_ds(&p, ino);
+ if (dsaddr->ds_list[i] == NULL)
+ goto out_err_free;
+ } else {
+ u32 len;
+ /* skip extra multipath */
+ len = be32_to_cpup(p++);
+ p += XDR_QUADLEN(len);
+ len = be32_to_cpup(p++);
+ p += XDR_QUADLEN(len);
+ continue;
+ }
+ }
+ }
+ return dsaddr;
+
+out_err_free:
+ nfs4_fl_free_deviceid(dsaddr);
+out_err:
+ dprintk("%s ERROR: returning NULL\n", __func__);
+ return NULL;
+}
+
+/*
+ * Decode the opaque device specified in 'dev'
+ * and add it to the list of available devices.
+ * If the deviceid is already cached, nfs4_add_deviceid will return
+ * a pointer to the cached struct and throw away the new.
+ */
+static struct nfs4_file_layout_dsaddr*
+decode_and_add_device(struct inode *inode, struct pnfs_device *dev)
+{
+ struct nfs4_file_layout_dsaddr *dsaddr;
+ struct pnfs_deviceid_node *d;
+
+ dsaddr = decode_device(inode, dev);
+ if (!dsaddr) {
+ printk(KERN_WARNING "%s: Could not decode or add device\n",
+ __func__);
+ return NULL;
+ }
+
+ d = pnfs_add_deviceid(NFS_SERVER(inode)->nfs_client->cl_devid_cache,
+ &dsaddr->deviceid);
+
+ return container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
+}
+
+/*
+ * Retrieve the information for dev_id, add it to the list
+ * of available devices, and return it.
+ */
+struct nfs4_file_layout_dsaddr *
+get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id)
+{
+ struct pnfs_device *pdev = NULL;
+ u32 max_resp_sz;
+ int max_pages;
+ struct page **pages = NULL;
+ struct nfs4_file_layout_dsaddr *dsaddr = NULL;
+ int rc, i;
+ struct nfs_server *server = NFS_SERVER(inode);
+
+ /*
+ * Use the session max response size as the basis for setting
+ * GETDEVICEINFO's maxcount
+ */
+ max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
+ max_pages = max_resp_sz >> PAGE_SHIFT;
+ dprintk("%s inode %p max_resp_sz %u max_pages %d\n",
+ __func__, inode, max_resp_sz, max_pages);
+
+ pdev = kzalloc(sizeof(struct pnfs_device), GFP_KERNEL);
+ if (pdev == NULL)
+ return NULL;
+
+ pages = kzalloc(max_pages * sizeof(struct page *), GFP_KERNEL);
+ if (pages == NULL) {
+ kfree(pdev);
+ return NULL;
+ }
+ for (i = 0; i < max_pages; i++) {
+ pages[i] = alloc_page(GFP_KERNEL);
+ if (!pages[i])
+ goto out_free;
+ }
+
+ /* set pdev->area */
+ pdev->area = vmap(pages, max_pages, VM_MAP, PAGE_KERNEL);
+ if (!pdev->area)
+ goto out_free;
+
+ memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id));
+ pdev->layout_type = LAYOUT_NFSV4_1_FILES;
+ pdev->pages = pages;
+ pdev->pgbase = 0;
+ pdev->pglen = PAGE_SIZE * max_pages;
+ pdev->mincount = 0;
+
+ rc = nfs4_proc_getdeviceinfo(server, pdev);
+ dprintk("%s getdevice info returns %d\n", __func__, rc);
+ if (rc)
+ goto out_free;
+
+ /*
+ * Found new device, need to decode it and then add it to the
+ * list of known devices for this mountpoint.
+ */
+ dsaddr = decode_and_add_device(inode, pdev);
+out_free:
+ if (pdev->area != NULL)
+ vunmap(pdev->area);
+ for (i = 0; i < max_pages; i++)
+ __free_page(pages[i]);
+ kfree(pages);
+ kfree(pdev);
+ dprintk("<-- %s dsaddr %p\n", __func__, dsaddr);
+ return dsaddr;
+}
+
+struct nfs4_file_layout_dsaddr *
+nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id)
+{
+ struct pnfs_deviceid_node *d;
+
+ d = pnfs_find_get_deviceid(clp->cl_devid_cache, id);
+ return (d == NULL) ? NULL :
+ container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
+}
projects / mv-sheeva.git / blobdiff