![Suresh Jayaraman](/assets/img/avatar_default.png)
Define inode-level data storage objects (managed by cifsInodeInfo structs). Each inode-level object is created in a super-block level object and is itself a data storage object in to which pages from the inode are stored. The inode object is keyed by UniqueId. The coherency data being used is LastWriteTime, LastChangeTime and end of file reported by the server. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
301 lines
7.3 KiB
C
301 lines
7.3 KiB
C
/*
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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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uint16_t 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->addr.sockAddr;
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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 = server->addr.sockAddr.sin_family;
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key->port = server->addr.sockAddr.sin_port;
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key->addr[0].ipv4_addr = server->addr.sockAddr.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 = server->addr.sockAddr6.sin6_family;
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key->port = server->addr.sockAddr6.sin6_port;
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key->addr[0].ipv6_addr = server->addr.sockAddr6.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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cERROR(1, "CIFS: Unknown network family '%d'", 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 cifsTconInfo *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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cFYI(1, "CIFS: couldn't extract sharename\n");
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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 cifsTconInfo *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 cifsTconInfo *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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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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};
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