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// SPDX-License-Identifier: LGPL-2.1
/*
* CIFS filesystem cache interface
*
* Copyright (c) 2010 Novell, Inc.
* Author(s): Suresh Jayaraman <sjayaraman@suse.de>
*
*/
#include "fscache.h"
#include "cifsglob.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifsproto.h"
/*
* Key for fscache inode. [!] Contents must match comparisons in cifs_find_inode().
*/
struct cifs_fscache_inode_key {
__le64 uniqueid; /* server inode number */
__le64 createtime; /* creation time on server */
u8 type; /* S_IFMT file type */
} __packed;
static void cifs_fscache_fill_volume_coherency(
struct cifs_tcon *tcon,
struct cifs_fscache_volume_coherency_data *cd)
{
memset(cd, 0, sizeof(*cd));
cd->resource_id = cpu_to_le64(tcon->resource_id);
cd->vol_create_time = tcon->vol_create_time;
cd->vol_serial_number = cpu_to_le32(tcon->vol_serial_number);
}
int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
{
struct cifs_fscache_volume_coherency_data cd;
struct TCP_Server_Info *server = tcon->ses->server;
struct fscache_volume *vcookie;
const struct sockaddr *sa = (struct sockaddr *)&server->dstaddr;
size_t slen, i;
char *sharename;
char *key;
int ret = -ENOMEM;
if (tcon->fscache_acquired)
return 0;
mutex_lock(&tcon->fscache_lock);
if (tcon->fscache_acquired) {
mutex_unlock(&tcon->fscache_lock);
return 0;
}
tcon->fscache_acquired = true;
tcon->fscache = NULL;
switch (sa->sa_family) {
case AF_INET:
case AF_INET6:
break;
default:
mutex_unlock(&tcon->fscache_lock);
cifs_dbg(VFS, "Unknown network family '%d'\n", sa->sa_family);
return -EINVAL;
}
memset(&key, 0, sizeof(key));
sharename = extract_sharename(tcon->tree_name);
if (IS_ERR(sharename)) {
mutex_unlock(&tcon->fscache_lock);
cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
return PTR_ERR(sharename);
}
slen = strlen(sharename);
for (i = 0; i < slen; i++)
if (sharename[i] == '/')
sharename[i] = ';';
key = kasprintf(GFP_KERNEL, "cifs,%pISpc,%s", sa, sharename);
if (!key)
goto out;
cifs_fscache_fill_volume_coherency(tcon, &cd);
vcookie = fscache_acquire_volume(key,
NULL, /* preferred_cache */
&cd, sizeof(cd));
cifs_dbg(FYI, "%s: (%s/0x%p)\n", __func__, key, vcookie);
if (IS_ERR(vcookie)) {
if (vcookie != ERR_PTR(-EBUSY)) {
ret = PTR_ERR(vcookie);
goto out_2;
}
pr_err("Cache volume key already in use (%s)\n", key);
vcookie = NULL;
trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
netfs_trace_tcon_ref_see_fscache_collision);
} else {
trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
netfs_trace_tcon_ref_see_fscache_okay);
}
tcon->fscache = vcookie;
ret = 0;
out_2:
kfree(key);
out:
kfree(sharename);
mutex_unlock(&tcon->fscache_lock);
return ret;
}
void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon)
{
struct cifs_fscache_volume_coherency_data cd;
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, tcon->fscache);
cifs_fscache_fill_volume_coherency(tcon, &cd);
fscache_relinquish_volume(tcon->fscache, &cd, false);
tcon->fscache = NULL;
trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
netfs_trace_tcon_ref_see_fscache_relinq);
}
void cifs_fscache_get_inode_cookie(struct inode *inode)
{
struct cifs_fscache_inode_coherency_data cd;
struct cifs_fscache_inode_key key;
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);
key.uniqueid = cpu_to_le64(cifsi->uniqueid);
key.createtime = cpu_to_le64(cifsi->createtime);
key.type = (inode->i_mode & S_IFMT) >> 12;
cifs_fscache_fill_coherency(&cifsi->netfs.inode, &cd);
cifsi->netfs.cache =
fscache_acquire_cookie(tcon->fscache, 0,
&key, sizeof(key),
&cd, sizeof(cd),
i_size_read(&cifsi->netfs.inode));
if (cifsi->netfs.cache)
mapping_set_release_always(inode->i_mapping);
}
void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update)
{
if (update) {
struct cifs_fscache_inode_coherency_data cd;
loff_t i_size = i_size_read(inode);
cifs_fscache_fill_coherency(inode, &cd);
fscache_unuse_cookie(cifs_inode_cookie(inode), &cd, &i_size);
} else {
fscache_unuse_cookie(cifs_inode_cookie(inode), NULL, NULL);
}
}
void cifs_fscache_release_inode_cookie(struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct fscache_cookie *cookie = cifs_inode_cookie(inode);
if (cookie) {
cifs_dbg(FYI, "%s: (0x%p)\n", __func__, cookie);
fscache_relinquish_cookie(cookie, false);
cifsi->netfs.cache = NULL;
}
}
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