334 lines
8.0 KiB
C
334 lines
8.0 KiB
C
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/*
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* fs/cifs/cache.c - CIFS filesystem cache index structure definitions
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*
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* Copyright (c) 2010 Novell, Inc.
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* Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "fscache.h"
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#include "cifs_debug.h"
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/*
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* CIFS filesystem definition for FS-Cache
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*/
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struct fscache_netfs cifs_fscache_netfs = {
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.name = "cifs",
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.version = 0,
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};
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/*
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* Register CIFS for caching with FS-Cache
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*/
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int cifs_fscache_register(void)
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{
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return fscache_register_netfs(&cifs_fscache_netfs);
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}
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/*
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* Unregister CIFS for caching
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*/
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void cifs_fscache_unregister(void)
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{
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fscache_unregister_netfs(&cifs_fscache_netfs);
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}
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/*
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* Key layout of CIFS server cache index object
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*/
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struct cifs_server_key {
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uint16_t family; /* address family */
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__be16 port; /* IP port */
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union {
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struct in_addr ipv4_addr;
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struct in6_addr ipv6_addr;
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} addr[0];
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};
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/*
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* Server object keyed by {IPaddress,port,family} tuple
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*/
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static uint16_t cifs_server_get_key(const void *cookie_netfs_data,
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void *buffer, uint16_t maxbuf)
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{
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const struct TCP_Server_Info *server = cookie_netfs_data;
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const struct sockaddr *sa = (struct sockaddr *) &server->dstaddr;
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const struct sockaddr_in *addr = (struct sockaddr_in *) sa;
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const struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) sa;
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struct cifs_server_key *key = buffer;
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uint16_t key_len = sizeof(struct cifs_server_key);
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memset(key, 0, key_len);
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/*
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* Should not be a problem as sin_family/sin6_family overlays
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* sa_family field
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*/
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switch (sa->sa_family) {
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case AF_INET:
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key->family = sa->sa_family;
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key->port = addr->sin_port;
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key->addr[0].ipv4_addr = addr->sin_addr;
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key_len += sizeof(key->addr[0].ipv4_addr);
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break;
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case AF_INET6:
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key->family = sa->sa_family;
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key->port = addr6->sin6_port;
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key->addr[0].ipv6_addr = addr6->sin6_addr;
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key_len += sizeof(key->addr[0].ipv6_addr);
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break;
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default:
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cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family);
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key_len = 0;
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break;
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}
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return key_len;
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}
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/*
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* Server object for FS-Cache
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*/
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const struct fscache_cookie_def cifs_fscache_server_index_def = {
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.name = "CIFS.server",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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.get_key = cifs_server_get_key,
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};
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/*
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* Auxiliary data attached to CIFS superblock within the cache
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*/
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struct cifs_fscache_super_auxdata {
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u64 resource_id; /* unique server resource id */
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};
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static char *extract_sharename(const char *treename)
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{
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const char *src;
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char *delim, *dst;
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int len;
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/* skip double chars at the beginning */
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src = treename + 2;
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/* share name is always preceded by '\\' now */
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delim = strchr(src, '\\');
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if (!delim)
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return ERR_PTR(-EINVAL);
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delim++;
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len = strlen(delim);
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/* caller has to free the memory */
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dst = kstrndup(delim, len, GFP_KERNEL);
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if (!dst)
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return ERR_PTR(-ENOMEM);
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return dst;
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}
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/*
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* Superblock object currently keyed by share name
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*/
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static uint16_t cifs_super_get_key(const void *cookie_netfs_data, void *buffer,
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uint16_t maxbuf)
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{
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const struct cifs_tcon *tcon = cookie_netfs_data;
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char *sharename;
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uint16_t len;
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sharename = extract_sharename(tcon->treeName);
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if (IS_ERR(sharename)) {
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cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
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sharename = NULL;
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return 0;
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}
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len = strlen(sharename);
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if (len > maxbuf)
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return 0;
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memcpy(buffer, sharename, len);
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kfree(sharename);
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return len;
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}
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static uint16_t
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cifs_fscache_super_get_aux(const void *cookie_netfs_data, void *buffer,
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uint16_t maxbuf)
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{
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struct cifs_fscache_super_auxdata auxdata;
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const struct cifs_tcon *tcon = cookie_netfs_data;
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memset(&auxdata, 0, sizeof(auxdata));
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auxdata.resource_id = tcon->resource_id;
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if (maxbuf > sizeof(auxdata))
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maxbuf = sizeof(auxdata);
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memcpy(buffer, &auxdata, maxbuf);
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return maxbuf;
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}
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static enum
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fscache_checkaux cifs_fscache_super_check_aux(void *cookie_netfs_data,
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const void *data,
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uint16_t datalen)
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{
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struct cifs_fscache_super_auxdata auxdata;
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const struct cifs_tcon *tcon = cookie_netfs_data;
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if (datalen != sizeof(auxdata))
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return FSCACHE_CHECKAUX_OBSOLETE;
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memset(&auxdata, 0, sizeof(auxdata));
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auxdata.resource_id = tcon->resource_id;
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if (memcmp(data, &auxdata, datalen) != 0)
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return FSCACHE_CHECKAUX_OBSOLETE;
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return FSCACHE_CHECKAUX_OKAY;
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}
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/*
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* Superblock object for FS-Cache
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*/
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const struct fscache_cookie_def cifs_fscache_super_index_def = {
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.name = "CIFS.super",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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.get_key = cifs_super_get_key,
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.get_aux = cifs_fscache_super_get_aux,
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.check_aux = cifs_fscache_super_check_aux,
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};
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/*
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* Auxiliary data attached to CIFS inode within the cache
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*/
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struct cifs_fscache_inode_auxdata {
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struct timespec last_write_time;
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struct timespec last_change_time;
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u64 eof;
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};
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static uint16_t cifs_fscache_inode_get_key(const void *cookie_netfs_data,
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void *buffer, uint16_t maxbuf)
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{
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const struct cifsInodeInfo *cifsi = cookie_netfs_data;
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uint16_t keylen;
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/* use the UniqueId as the key */
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keylen = sizeof(cifsi->uniqueid);
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if (keylen > maxbuf)
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keylen = 0;
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else
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memcpy(buffer, &cifsi->uniqueid, keylen);
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return keylen;
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}
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static void
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cifs_fscache_inode_get_attr(const void *cookie_netfs_data, uint64_t *size)
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{
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const struct cifsInodeInfo *cifsi = cookie_netfs_data;
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*size = cifsi->vfs_inode.i_size;
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}
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static uint16_t
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cifs_fscache_inode_get_aux(const void *cookie_netfs_data, void *buffer,
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uint16_t maxbuf)
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{
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struct cifs_fscache_inode_auxdata auxdata;
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const struct cifsInodeInfo *cifsi = cookie_netfs_data;
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memset(&auxdata, 0, sizeof(auxdata));
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auxdata.eof = cifsi->server_eof;
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auxdata.last_write_time = cifsi->vfs_inode.i_mtime;
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auxdata.last_change_time = cifsi->vfs_inode.i_ctime;
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if (maxbuf > sizeof(auxdata))
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maxbuf = sizeof(auxdata);
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memcpy(buffer, &auxdata, maxbuf);
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return maxbuf;
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}
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static enum
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fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
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const void *data,
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uint16_t datalen)
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{
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struct cifs_fscache_inode_auxdata auxdata;
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struct cifsInodeInfo *cifsi = cookie_netfs_data;
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if (datalen != sizeof(auxdata))
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return FSCACHE_CHECKAUX_OBSOLETE;
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memset(&auxdata, 0, sizeof(auxdata));
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auxdata.eof = cifsi->server_eof;
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auxdata.last_write_time = cifsi->vfs_inode.i_mtime;
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auxdata.last_change_time = cifsi->vfs_inode.i_ctime;
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if (memcmp(data, &auxdata, datalen) != 0)
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return FSCACHE_CHECKAUX_OBSOLETE;
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return FSCACHE_CHECKAUX_OKAY;
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}
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static void cifs_fscache_inode_now_uncached(void *cookie_netfs_data)
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{
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struct cifsInodeInfo *cifsi = cookie_netfs_data;
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struct pagevec pvec;
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pgoff_t first;
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int loop, nr_pages;
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pagevec_init(&pvec, 0);
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first = 0;
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cifs_dbg(FYI, "%s: cifs inode 0x%p now uncached\n", __func__, cifsi);
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for (;;) {
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nr_pages = pagevec_lookup(&pvec,
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cifsi->vfs_inode.i_mapping, first,
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PAGEVEC_SIZE - pagevec_count(&pvec));
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if (!nr_pages)
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break;
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for (loop = 0; loop < nr_pages; loop++)
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ClearPageFsCache(pvec.pages[loop]);
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first = pvec.pages[nr_pages - 1]->index + 1;
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pvec.nr = nr_pages;
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pagevec_release(&pvec);
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cond_resched();
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}
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}
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const struct fscache_cookie_def cifs_fscache_inode_object_def = {
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.name = "CIFS.uniqueid",
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.type = FSCACHE_COOKIE_TYPE_DATAFILE,
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.get_key = cifs_fscache_inode_get_key,
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.get_attr = cifs_fscache_inode_get_attr,
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.get_aux = cifs_fscache_inode_get_aux,
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.check_aux = cifs_fscache_inode_check_aux,
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.now_uncached = cifs_fscache_inode_now_uncached,
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};
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