diff options
Diffstat (limited to 'fs/nfs/nfs4filelayoutdev.c')
| -rw-r--r-- | fs/nfs/nfs4filelayoutdev.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c new file mode 100644 index 00000000000..51fe64ace55 --- /dev/null +++ b/fs/nfs/nfs4filelayoutdev.c @@ -0,0 +1,448 @@ +/* + * 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); +} |