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|
/*
* fs/cifs/fscache.c - CIFS filesystem cache interface
*
* Copyright (c) 2010 Novell, Inc.
* Author(s): Suresh Jayaraman <sjayaraman@suse.de>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "fscache.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
/*
* Key layout of CIFS server cache index object
*/
struct cifs_server_key {
struct {
uint16_t family; /* address family */
__be16 port; /* IP port */
} hdr;
union {
struct in_addr ipv4_addr;
struct in6_addr ipv6_addr;
};
} __packed;
/*
* Get a cookie for a server object keyed by {IPaddress,port,family} tuple
*/
void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
{
const struct sockaddr *sa = (struct sockaddr *) &server->dstaddr;
const struct sockaddr_in *addr = (struct sockaddr_in *) sa;
const struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) sa;
struct cifs_server_key key;
uint16_t key_len = sizeof(key.hdr);
memset(&key, 0, sizeof(key));
/*
* Should not be a problem as sin_family/sin6_family overlays
* sa_family field
*/
key.hdr.family = sa->sa_family;
switch (sa->sa_family) {
case AF_INET:
key.hdr.port = addr->sin_port;
key.ipv4_addr = addr->sin_addr;
key_len += sizeof(key.ipv4_addr);
break;
case AF_INET6:
key.hdr.port = addr6->sin6_port;
key.ipv6_addr = addr6->sin6_addr;
key_len += sizeof(key.ipv6_addr);
break;
default:
cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family);
server->fscache = NULL;
return;
}
server->fscache =
fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
&cifs_fscache_server_index_def,
&key, key_len,
NULL, 0,
server, 0, true);
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
__func__, server, server->fscache);
}
void cifs_fscache_release_client_cookie(struct TCP_Server_Info *server)
{
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
__func__, server, server->fscache);
fscache_relinquish_cookie(server->fscache, NULL, false);
server->fscache = NULL;
}
void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
{
struct TCP_Server_Info *server = tcon->ses->server;
char *sharename;
struct cifs_fscache_super_auxdata auxdata;
sharename = extract_sharename(tcon->treeName);
if (IS_ERR(sharename)) {
cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
tcon->fscache = NULL;
return;
}
memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
tcon->fscache =
fscache_acquire_cookie(server->fscache,
&cifs_fscache_super_index_def,
sharename, strlen(sharename),
&auxdata, sizeof(auxdata),
tcon, 0, true);
kfree(sharename);
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
__func__, server->fscache, tcon->fscache);
}
void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
{
struct cifs_fscache_super_auxdata auxdata;
memset(&auxdata, 0, sizeof(auxdata));
auxdata.resource_id = tcon->resource_id;
auxdata.vol_create_time = tcon->vol_create_time;
auxdata.vol_serial_number = tcon->vol_serial_number;
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
fscache_relinquish_cookie(tcon->fscache, &auxdata, false);
tcon->fscache = NULL;
}
static void cifs_fscache_acquire_inode_cookie(struct cifsInodeInfo *cifsi,
struct cifs_tcon *tcon)
{
struct cifs_fscache_inode_auxdata auxdata;
memset(&auxdata, 0, sizeof(auxdata));
auxdata.eof = cifsi->server_eof;
auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
cifsi->fscache =
fscache_acquire_cookie(tcon->fscache,
&cifs_fscache_inode_object_def,
&cifsi->uniqueid, sizeof(cifsi->uniqueid),
&auxdata, sizeof(auxdata),
cifsi, cifsi->vfs_inode.i_size, true);
}
static void cifs_fscache_enable_inode_cookie(struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
if (cifsi->fscache)
return;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE))
return;
cifs_fscache_acquire_inode_cookie(cifsi, tcon);
cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
__func__, tcon->fscache, cifsi->fscache);
}
void cifs_fscache_release_inode_cookie(struct inode *inode)
{
struct cifs_fscache_inode_auxdata auxdata;
struct cifsInodeInfo *cifsi = CIFS_I(inode);
if (cifsi->fscache) {
memset(&auxdata, 0, sizeof(auxdata));
auxdata.eof = cifsi->server_eof;
auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
fscache_relinquish_cookie(cifsi->fscache, &auxdata, false);
cifsi->fscache = NULL;
}
}
static void cifs_fscache_disable_inode_cookie(struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
if (cifsi->fscache) {
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cifsi->fscache);
fscache_uncache_all_inode_pages(cifsi->fscache, inode);
fscache_relinquish_cookie(cifsi->fscache, NULL, true);
cifsi->fscache = NULL;
}
}
void cifs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
{
if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
cifs_fscache_disable_inode_cookie(inode);
else
cifs_fscache_enable_inode_cookie(inode);
}
void cifs_fscache_reset_inode_cookie(struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct fscache_cookie *old = cifsi->fscache;
if (cifsi->fscache) {
/* retire the current fscache cache and get a new one */
fscache_relinquish_cookie(cifsi->fscache, NULL, true);
cifs_fscache_acquire_inode_cookie(cifsi, tcon);
cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
__func__, cifsi->fscache, old);
}
}
int cifs_fscache_release_page(struct page *page, gfp_t gfp)
{
if (PageFsCache(page)) {
struct inode *inode = page->mapping->host;
struct cifsInodeInfo *cifsi = CIFS_I(inode);
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
__func__, page, cifsi->fscache);
if (!fscache_maybe_release_page(cifsi->fscache, page, gfp))
return 0;
}
return 1;
}
static void cifs_readpage_from_fscache_complete(
|