9p: Add fscache support to 9p
This patch adds a persistent, read-only caching facility for 9p clients using the FS-Cache caching backend. When the fscache facility is enabled, each inode is associated with a corresponding vcookie which is an index into the FS-Cache indexing tree. The FS-Cache indexing tree is indexed at 3 levels: - session object associated with each mount. - inode/vcookie - actual data (pages) A cache tag is chosen randomly for each session. These tags can be read off /sys/fs/9p/caches and can be passed as a mount-time parameter to re-attach to the specified caching session. Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Abhishek Kulkarni
Eric Van Hensbergen
parent
637d020a02
commit
60e78d2c99
12 changed files with 1009 additions and 42 deletions
|
|
@ -8,3 +8,12 @@ config 9P_FS
|
|||
See <http://v9fs.sf.net> for more information.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
config 9P_FSCACHE
|
||||
bool "Enable 9P client caching support (EXPERIMENTAL)"
|
||||
depends on EXPERIMENTAL
|
||||
depends on 9P_FS=m && FSCACHE || 9P_FS=y && FSCACHE=y
|
||||
help
|
||||
Choose Y here to enable persistent, read-only local
|
||||
caching support for 9p clients using FS-Cache
|
||||
|
||||
|
|
|
|||
|
|
@ -8,5 +8,6 @@ obj-$(CONFIG_9P_FS) := 9p.o
|
|||
vfs_dir.o \
|
||||
vfs_dentry.o \
|
||||
v9fs.o \
|
||||
fid.o \
|
||||
fid.o
|
||||
|
||||
9p-$(CONFIG_9P_FSCACHE) += cache.o
|
||||
|
|
|
|||
474
fs/9p/cache.c
Normal file
474
fs/9p/cache.c
Normal file
|
|
@ -0,0 +1,474 @@
|
|||
/*
|
||||
* V9FS cache definitions.
|
||||
*
|
||||
* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2
|
||||
* as published by the Free Software Foundation.
|
||||
*
|
||||
* This program 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 General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to:
|
||||
* Free Software Foundation
|
||||
* 51 Franklin Street, Fifth Floor
|
||||
* Boston, MA 02111-1301 USA
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/jiffies.h>
|
||||
#include <linux/file.h>
|
||||
#include <linux/stat.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/fs.h>
|
||||
#include <net/9p/9p.h>
|
||||
|
||||
#include "v9fs.h"
|
||||
#include "cache.h"
|
||||
|
||||
#define CACHETAG_LEN 11
|
||||
|
||||
struct kmem_cache *vcookie_cache;
|
||||
|
||||
struct fscache_netfs v9fs_cache_netfs = {
|
||||
.name = "9p",
|
||||
.version = 0,
|
||||
};
|
||||
|
||||
static void init_once(void *foo)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = (struct v9fs_cookie *) foo;
|
||||
vcookie->fscache = NULL;
|
||||
vcookie->qid = NULL;
|
||||
inode_init_once(&vcookie->inode);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_init_vcookiecache - initialize a cache for vcookies to maintain
|
||||
* vcookie to inode mapping
|
||||
*
|
||||
* Returns 0 on success.
|
||||
*/
|
||||
|
||||
static int v9fs_init_vcookiecache(void)
|
||||
{
|
||||
vcookie_cache = kmem_cache_create("vcookie_cache",
|
||||
sizeof(struct v9fs_cookie),
|
||||
0, (SLAB_RECLAIM_ACCOUNT|
|
||||
SLAB_MEM_SPREAD),
|
||||
init_once);
|
||||
if (!vcookie_cache)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_destroy_vcookiecache - destroy the cache of vcookies
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_destroy_vcookiecache(void)
|
||||
{
|
||||
kmem_cache_destroy(vcookie_cache);
|
||||
}
|
||||
|
||||
int __v9fs_cache_register(void)
|
||||
{
|
||||
int ret;
|
||||
ret = v9fs_init_vcookiecache();
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return fscache_register_netfs(&v9fs_cache_netfs);
|
||||
}
|
||||
|
||||
void __v9fs_cache_unregister(void)
|
||||
{
|
||||
v9fs_destroy_vcookiecache();
|
||||
fscache_unregister_netfs(&v9fs_cache_netfs);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_random_cachetag - Generate a random tag to be associated
|
||||
* with a new cache session.
|
||||
*
|
||||
* The value of jiffies is used for a fairly randomly cache tag.
|
||||
*/
|
||||
|
||||
static
|
||||
int v9fs_random_cachetag(struct v9fs_session_info *v9ses)
|
||||
{
|
||||
v9ses->cachetag = kmalloc(CACHETAG_LEN, GFP_KERNEL);
|
||||
if (!v9ses->cachetag)
|
||||
return -ENOMEM;
|
||||
|
||||
return scnprintf(v9ses->cachetag, CACHETAG_LEN, "%lu", jiffies);
|
||||
}
|
||||
|
||||
static uint16_t v9fs_cache_session_get_key(const void *cookie_netfs_data,
|
||||
void *buffer, uint16_t bufmax)
|
||||
{
|
||||
struct v9fs_session_info *v9ses;
|
||||
uint16_t klen = 0;
|
||||
|
||||
v9ses = (struct v9fs_session_info *)cookie_netfs_data;
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "session %p buf %p size %u", v9ses,
|
||||
buffer, bufmax);
|
||||
|
||||
if (v9ses->cachetag)
|
||||
klen = strlen(v9ses->cachetag);
|
||||
|
||||
if (klen > bufmax)
|
||||
return 0;
|
||||
|
||||
memcpy(buffer, v9ses->cachetag, klen);
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "cache session tag %s", v9ses->cachetag);
|
||||
return klen;
|
||||
}
|
||||
|
||||
const struct fscache_cookie_def v9fs_cache_session_index_def = {
|
||||
.name = "9P.session",
|
||||
.type = FSCACHE_COOKIE_TYPE_INDEX,
|
||||
.get_key = v9fs_cache_session_get_key,
|
||||
};
|
||||
|
||||
void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
|
||||
{
|
||||
/* If no cache session tag was specified, we generate a random one. */
|
||||
if (!v9ses->cachetag)
|
||||
v9fs_random_cachetag(v9ses);
|
||||
|
||||
v9ses->fscache = fscache_acquire_cookie(v9fs_cache_netfs.primary_index,
|
||||
&v9fs_cache_session_index_def,
|
||||
v9ses);
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "session %p get cookie %p", v9ses,
|
||||
v9ses->fscache);
|
||||
}
|
||||
|
||||
void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses)
|
||||
{
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "session %p put cookie %p", v9ses,
|
||||
v9ses->fscache);
|
||||
fscache_relinquish_cookie(v9ses->fscache, 0);
|
||||
v9ses->fscache = NULL;
|
||||
}
|
||||
|
||||
|
||||
static uint16_t v9fs_cache_inode_get_key(const void *cookie_netfs_data,
|
||||
void *buffer, uint16_t bufmax)
|
||||
{
|
||||
const struct v9fs_cookie *vcookie = cookie_netfs_data;
|
||||
memcpy(buffer, &vcookie->qid->path, sizeof(vcookie->qid->path));
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get key %llu", &vcookie->inode,
|
||||
vcookie->qid->path);
|
||||
return sizeof(vcookie->qid->path);
|
||||
}
|
||||
|
||||
static void v9fs_cache_inode_get_attr(const void *cookie_netfs_data,
|
||||
uint64_t *size)
|
||||
{
|
||||
const struct v9fs_cookie *vcookie = cookie_netfs_data;
|
||||
*size = i_size_read(&vcookie->inode);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get attr %llu", &vcookie->inode,
|
||||
*size);
|
||||
}
|
||||
|
||||
static uint16_t v9fs_cache_inode_get_aux(const void *cookie_netfs_data,
|
||||
void *buffer, uint16_t buflen)
|
||||
{
|
||||
const struct v9fs_cookie *vcookie = cookie_netfs_data;
|
||||
memcpy(buffer, &vcookie->qid->version, sizeof(vcookie->qid->version));
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get aux %u", &vcookie->inode,
|
||||
vcookie->qid->version);
|
||||
return sizeof(vcookie->qid->version);
|
||||
}
|
||||
|
||||
static enum
|
||||
fscache_checkaux v9fs_cache_inode_check_aux(void *cookie_netfs_data,
|
||||
const void *buffer,
|
||||
uint16_t buflen)
|
||||
{
|
||||
const struct v9fs_cookie *vcookie = cookie_netfs_data;
|
||||
|
||||
if (buflen != sizeof(vcookie->qid->version))
|
||||
return FSCACHE_CHECKAUX_OBSOLETE;
|
||||
|
||||
if (memcmp(buffer, &vcookie->qid->version,
|
||||
sizeof(vcookie->qid->version)))
|
||||
return FSCACHE_CHECKAUX_OBSOLETE;
|
||||
|
||||
return FSCACHE_CHECKAUX_OKAY;
|
||||
}
|
||||
|
||||
static void v9fs_cache_inode_now_uncached(void *cookie_netfs_data)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = cookie_netfs_data;
|
||||
struct pagevec pvec;
|
||||
pgoff_t first;
|
||||
int loop, nr_pages;
|
||||
|
||||
pagevec_init(&pvec, 0);
|
||||
first = 0;
|
||||
|
||||
for (;;) {
|
||||
nr_pages = pagevec_lookup(&pvec, vcookie->inode.i_mapping,
|
||||
first,
|
||||
PAGEVEC_SIZE - pagevec_count(&pvec));
|
||||
if (!nr_pages)
|
||||
break;
|
||||
|
||||
for (loop = 0; loop < nr_pages; loop++)
|
||||
ClearPageFsCache(pvec.pages[loop]);
|
||||
|
||||
first = pvec.pages[nr_pages - 1]->index + 1;
|
||||
|
||||
pvec.nr = nr_pages;
|
||||
pagevec_release(&pvec);
|
||||
cond_resched();
|
||||
}
|
||||
}
|
||||
|
||||
const struct fscache_cookie_def v9fs_cache_inode_index_def = {
|
||||
.name = "9p.inode",
|
||||
.type = FSCACHE_COOKIE_TYPE_DATAFILE,
|
||||
.get_key = v9fs_cache_inode_get_key,
|
||||
.get_attr = v9fs_cache_inode_get_attr,
|
||||
.get_aux = v9fs_cache_inode_get_aux,
|
||||
.check_aux = v9fs_cache_inode_check_aux,
|
||||
.now_uncached = v9fs_cache_inode_now_uncached,
|
||||
};
|
||||
|
||||
void v9fs_cache_inode_get_cookie(struct inode *inode)
|
||||
{
|
||||
struct v9fs_cookie *vcookie;
|
||||
struct v9fs_session_info *v9ses;
|
||||
|
||||
if (!S_ISREG(inode->i_mode))
|
||||
return;
|
||||
|
||||
vcookie = v9fs_inode2cookie(inode);
|
||||
if (vcookie->fscache)
|
||||
return;
|
||||
|
||||
v9ses = v9fs_inode2v9ses(inode);
|
||||
vcookie->fscache = fscache_acquire_cookie(v9ses->fscache,
|
||||
&v9fs_cache_inode_index_def,
|
||||
vcookie);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get cookie %p", inode,
|
||||
vcookie->fscache);
|
||||
}
|
||||
|
||||
void v9fs_cache_inode_put_cookie(struct inode *inode)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
if (!vcookie->fscache)
|
||||
return;
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p put cookie %p", inode,
|
||||
vcookie->fscache);
|
||||
|
||||
fscache_relinquish_cookie(vcookie->fscache, 0);
|
||||
vcookie->fscache = NULL;
|
||||
}
|
||||
|
||||
void v9fs_cache_inode_flush_cookie(struct inode *inode)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
if (!vcookie->fscache)
|
||||
return;
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p flush cookie %p", inode,
|
||||
vcookie->fscache);
|
||||
|
||||
fscache_relinquish_cookie(vcookie->fscache, 1);
|
||||
vcookie->fscache = NULL;
|
||||
}
|
||||
|
||||
void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
struct p9_fid *fid;
|
||||
|
||||
if (!vcookie->fscache)
|
||||
return;
|
||||
|
||||
spin_lock(&vcookie->lock);
|
||||
fid = filp->private_data;
|
||||
if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
|
||||
v9fs_cache_inode_flush_cookie(inode);
|
||||
else
|
||||
v9fs_cache_inode_get_cookie(inode);
|
||||
|
||||
spin_unlock(&vcookie->lock);
|
||||
}
|
||||
|
||||
void v9fs_cache_inode_reset_cookie(struct inode *inode)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
struct v9fs_session_info *v9ses;
|
||||
struct fscache_cookie *old;
|
||||
|
||||
if (!vcookie->fscache)
|
||||
return;
|
||||
|
||||
old = vcookie->fscache;
|
||||
|
||||
spin_lock(&vcookie->lock);
|
||||
fscache_relinquish_cookie(vcookie->fscache, 1);
|
||||
|
||||
v9ses = v9fs_inode2v9ses(inode);
|
||||
vcookie->fscache = fscache_acquire_cookie(v9ses->fscache,
|
||||
&v9fs_cache_inode_index_def,
|
||||
vcookie);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p",
|
||||
inode, old, vcookie->fscache);
|
||||
|
||||
spin_unlock(&vcookie->lock);
|
||||
}
|
||||
|
||||
int __v9fs_fscache_release_page(struct page *page, gfp_t gfp)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
BUG_ON(!vcookie->fscache);
|
||||
|
||||
if (PageFsCache(page)) {
|
||||
if (fscache_check_page_write(vcookie->fscache, page)) {
|
||||
if (!(gfp & __GFP_WAIT))
|
||||
return 0;
|
||||
fscache_wait_on_page_write(vcookie->fscache, page);
|
||||
}
|
||||
|
||||
fscache_uncache_page(vcookie->fscache, page);
|
||||
ClearPageFsCache(page);
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
void __v9fs_fscache_invalidate_page(struct page *page)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
BUG_ON(!vcookie->fscache);
|
||||
|
||||
if (PageFsCache(page)) {
|
||||
fscache_wait_on_page_write(vcookie->fscache, page);
|
||||
BUG_ON(!PageLocked(page));
|
||||
fscache_uncache_page(vcookie->fscache, page);
|
||||
ClearPageFsCache(page);
|
||||
}
|
||||
}
|
||||
|
||||
static void v9fs_vfs_readpage_complete(struct page *page, void *data,
|
||||
int error)
|
||||
{
|
||||
if (!error)
|
||||
SetPageUptodate(page);
|
||||
|
||||
unlock_page(page);
|
||||
}
|
||||
|
||||
/**
|
||||
* __v9fs_readpage_from_fscache - read a page from cache
|
||||
*
|
||||
* Returns 0 if the pages are in cache and a BIO is submitted,
|
||||
* 1 if the pages are not in cache and -error otherwise.
|
||||
*/
|
||||
|
||||
int __v9fs_readpage_from_fscache(struct inode *inode, struct page *page)
|
||||
{
|
||||
int ret;
|
||||
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
|
||||
if (!vcookie->fscache)
|
||||
return -ENOBUFS;
|
||||
|
||||
ret = fscache_read_or_alloc_page(vcookie->fscache,
|
||||
page,
|
||||
v9fs_vfs_readpage_complete,
|
||||
NULL,
|
||||
GFP_KERNEL);
|
||||
switch (ret) {
|
||||
case -ENOBUFS:
|
||||
case -ENODATA:
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "page/inode not in cache %d", ret);
|
||||
return 1;
|
||||
case 0:
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "BIO submitted");
|
||||
return ret;
|
||||
default:
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "ret %d", ret);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* __v9fs_readpages_from_fscache - read multiple pages from cache
|
||||
*
|
||||
* Returns 0 if the pages are in cache and a BIO is submitted,
|
||||
* 1 if the pages are not in cache and -error otherwise.
|
||||
*/
|
||||
|
||||
int __v9fs_readpages_from_fscache(struct inode *inode,
|
||||
struct address_space *mapping,
|
||||
struct list_head *pages,
|
||||
unsigned *nr_pages)
|
||||
{
|
||||
int ret;
|
||||
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p pages %u", inode, *nr_pages);
|
||||
if (!vcookie->fscache)
|
||||
return -ENOBUFS;
|
||||
|
||||
ret = fscache_read_or_alloc_pages(vcookie->fscache,
|
||||
mapping, pages, nr_pages,
|
||||
v9fs_vfs_readpage_complete,
|
||||
NULL,
|
||||
mapping_gfp_mask(mapping));
|
||||
switch (ret) {
|
||||
case -ENOBUFS:
|
||||
case -ENODATA:
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "pages/inodes not in cache %d", ret);
|
||||
return 1;
|
||||
case 0:
|
||||
BUG_ON(!list_empty(pages));
|
||||
BUG_ON(*nr_pages != 0);
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "BIO submitted");
|
||||
return ret;
|
||||
default:
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "ret %d", ret);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* __v9fs_readpage_to_fscache - write a page to the cache
|
||||
*
|
||||
*/
|
||||
|
||||
void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page)
|
||||
{
|
||||
int ret;
|
||||
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
|
||||
ret = fscache_write_page(vcookie->fscache, page, GFP_KERNEL);
|
||||
P9_DPRINTK(P9_DEBUG_FSC, "ret = %d", ret);
|
||||
if (ret != 0)
|
||||
v9fs_uncache_page(inode, page);
|
||||
}
|
||||
176
fs/9p/cache.h
Normal file
176
fs/9p/cache.h
Normal file
|
|
@ -0,0 +1,176 @@
|
|||
/*
|
||||
* V9FS cache definitions.
|
||||
*
|
||||
* Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2
|
||||
* as published by the Free Software Foundation.
|
||||
*
|
||||
* This program 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 General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to:
|
||||
* Free Software Foundation
|
||||
* 51 Franklin Street, Fifth Floor
|
||||
* Boston, MA 02111-1301 USA
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _9P_CACHE_H
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
#include <linux/fscache.h>
|
||||
#include <linux/spinlock.h>
|
||||
|
||||
extern struct kmem_cache *vcookie_cache;
|
||||
|
||||
struct v9fs_cookie {
|
||||
spinlock_t lock;
|
||||
struct inode inode;
|
||||
struct fscache_cookie *fscache;
|
||||
struct p9_qid *qid;
|
||||
};
|
||||
|
||||
static inline struct v9fs_cookie *v9fs_inode2cookie(const struct inode *inode)
|
||||
{
|
||||
return container_of(inode, struct v9fs_cookie, inode);
|
||||
}
|
||||
|
||||
extern struct fscache_netfs v9fs_cache_netfs;
|
||||
extern const struct fscache_cookie_def v9fs_cache_session_index_def;
|
||||
extern const struct fscache_cookie_def v9fs_cache_inode_index_def;
|
||||
|
||||
extern void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses);
|
||||
extern void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses);
|
||||
|
||||
extern void v9fs_cache_inode_get_cookie(struct inode *inode);
|
||||
extern void v9fs_cache_inode_put_cookie(struct inode *inode);
|
||||
extern void v9fs_cache_inode_flush_cookie(struct inode *inode);
|
||||
extern void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp);
|
||||
extern void v9fs_cache_inode_reset_cookie(struct inode *inode);
|
||||
|
||||
extern int __v9fs_cache_register(void);
|
||||
extern void __v9fs_cache_unregister(void);
|
||||
|
||||
extern int __v9fs_fscache_release_page(struct page *page, gfp_t gfp);
|
||||
extern void __v9fs_fscache_invalidate_page(struct page *page);
|
||||
extern int __v9fs_readpage_from_fscache(struct inode *inode,
|
||||
struct page *page);
|
||||
extern int __v9fs_readpages_from_fscache(struct inode *inode,
|
||||
struct address_space *mapping,
|
||||
struct list_head *pages,
|
||||
unsigned *nr_pages);
|
||||
extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
|
||||
|
||||
|
||||
/**
|
||||
* v9fs_cache_register - Register v9fs file system with the cache
|
||||
*/
|
||||
static inline int v9fs_cache_register(void)
|
||||
{
|
||||
return __v9fs_cache_register();
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_cache_unregister - Unregister v9fs from the cache
|
||||
*/
|
||||
static inline void v9fs_cache_unregister(void)
|
||||
{
|
||||
__v9fs_cache_unregister();
|
||||
}
|
||||
|
||||
static inline int v9fs_fscache_release_page(struct page *page,
|
||||
gfp_t gfp)
|
||||
{
|
||||
return __v9fs_fscache_release_page(page, gfp);
|
||||
}
|
||||
|
||||
static inline void v9fs_fscache_invalidate_page(struct page *page)
|
||||
{
|
||||
__v9fs_fscache_invalidate_page(page);
|
||||
}
|
||||
|
||||
static inline int v9fs_readpage_from_fscache(struct inode *inode,
|
||||
struct page *page)
|
||||
{
|
||||
return __v9fs_readpage_from_fscache(inode, page);
|
||||
}
|
||||
|
||||
static inline int v9fs_readpages_from_fscache(struct inode *inode,
|
||||
struct address_space *mapping,
|
||||
struct list_head *pages,
|
||||
unsigned *nr_pages)
|
||||
{
|
||||
return __v9fs_readpages_from_fscache(inode, mapping, pages,
|
||||
nr_pages);
|
||||
}
|
||||
|
||||
static inline void v9fs_readpage_to_fscache(struct inode *inode,
|
||||
struct page *page)
|
||||
{
|
||||
if (PageFsCache(page))
|
||||
__v9fs_readpage_to_fscache(inode, page);
|
||||
}
|
||||
|
||||
static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
fscache_uncache_page(vcookie->fscache, page);
|
||||
BUG_ON(PageFsCache(page));
|
||||
}
|
||||
|
||||
static inline void v9fs_vcookie_set_qid(struct inode *inode,
|
||||
struct p9_qid *qid)
|
||||
{
|
||||
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
|
||||
spin_lock(&vcookie->lock);
|
||||
vcookie->qid = qid;
|
||||
spin_unlock(&vcookie->lock);
|
||||
}
|
||||
|
||||
#else /* CONFIG_9P_FSCACHE */
|
||||
|
||||
static inline int v9fs_cache_register(void)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static inline void v9fs_cache_unregister(void) {}
|
||||
|
||||
static inline int v9fs_fscache_release_page(struct page *page,
|
||||
gfp_t gfp) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
static inline void v9fs_fscache_invalidate_page(struct page *page) {}
|
||||
|
||||
static inline int v9fs_readpage_from_fscache(struct inode *inode,
|
||||
struct page *page)
|
||||
{
|
||||
return -ENOBUFS;
|
||||
}
|
||||
|
||||
static inline int v9fs_readpages_from_fscache(struct inode *inode,
|
||||
struct address_space *mapping,
|
||||
struct list_head *pages,
|
||||
unsigned *nr_pages)
|
||||
{
|
||||
return -ENOBUFS;
|
||||
}
|
||||
|
||||
static inline void v9fs_readpage_to_fscache(struct inode *inode,
|
||||
struct page *page)
|
||||
{}
|
||||
|
||||
static inline void v9fs_uncache_page(struct inode *inode, struct page *page)
|
||||
{}
|
||||
|
||||
static inline void v9fs_vcookie_set_qid(struct inode *inode,
|
||||
struct p9_qid *qid)
|
||||
{}
|
||||
|
||||
#endif /* CONFIG_9P_FSCACHE */
|
||||
#endif /* _9P_CACHE_H */
|
||||
196
fs/9p/v9fs.c
196
fs/9p/v9fs.c
|
|
@ -34,21 +34,25 @@
|
|||
#include <net/9p/transport.h>
|
||||
#include "v9fs.h"
|
||||
#include "v9fs_vfs.h"
|
||||
#include "cache.h"
|
||||
|
||||
static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
|
||||
static LIST_HEAD(v9fs_sessionlist);
|
||||
|
||||
/*
|
||||
* Option Parsing (code inspired by NFS code)
|
||||
* NOTE: each transport will parse its own options
|
||||
*/
|
||||
* Option Parsing (code inspired by NFS code)
|
||||
* NOTE: each transport will parse its own options
|
||||
*/
|
||||
|
||||
enum {
|
||||
/* Options that take integer arguments */
|
||||
Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
|
||||
/* String options */
|
||||
Opt_uname, Opt_remotename, Opt_trans,
|
||||
Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag,
|
||||
/* Options that take no arguments */
|
||||
Opt_nodevmap,
|
||||
/* Cache options */
|
||||
Opt_cache_loose,
|
||||
Opt_cache_loose, Opt_fscache,
|
||||
/* Access options */
|
||||
Opt_access,
|
||||
/* Error token */
|
||||
|
|
@ -63,8 +67,10 @@ static const match_table_t tokens = {
|
|||
{Opt_uname, "uname=%s"},
|
||||
{Opt_remotename, "aname=%s"},
|
||||
{Opt_nodevmap, "nodevmap"},
|
||||
{Opt_cache_loose, "cache=loose"},
|
||||
{Opt_cache, "cache=%s"},
|
||||
{Opt_cache_loose, "loose"},
|
||||
{Opt_fscache, "fscache"},
|
||||
{Opt_cachetag, "cachetag=%s"},
|
||||
{Opt_access, "access=%s"},
|
||||
{Opt_err, NULL}
|
||||
};
|
||||
|
|
@ -89,16 +95,16 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
|
|||
v9ses->afid = ~0;
|
||||
v9ses->debug = 0;
|
||||
v9ses->cache = 0;
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
v9ses->cachetag = NULL;
|
||||
#endif
|
||||
|
||||
if (!opts)
|
||||
return 0;
|
||||
|
||||
options = kstrdup(opts, GFP_KERNEL);
|
||||
if (!options) {
|
||||
P9_DPRINTK(P9_DEBUG_ERROR,
|
||||
"failed to allocate copy of option string\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
if (!options)
|
||||
goto fail_option_alloc;
|
||||
|
||||
while ((p = strsep(&options, ",")) != NULL) {
|
||||
int token;
|
||||
|
|
@ -143,16 +149,33 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
|
|||
case Opt_cache_loose:
|
||||
v9ses->cache = CACHE_LOOSE;
|
||||
break;
|
||||
case Opt_fscache:
|
||||
v9ses->cache = CACHE_FSCACHE;
|
||||
break;
|
||||
case Opt_cachetag:
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
v9ses->cachetag = match_strdup(&args[0]);
|
||||
#endif
|
||||
break;
|
||||
case Opt_cache:
|
||||
s = match_strdup(&args[0]);
|
||||
if (!s)
|
||||
goto fail_option_alloc;
|
||||
|
||||
if (strcmp(s, "loose") == 0)
|
||||
v9ses->cache = CACHE_LOOSE;
|
||||
else if (strcmp(s, "fscache") == 0)
|
||||
v9ses->cache = CACHE_FSCACHE;
|
||||
else
|
||||
v9ses->cache = CACHE_NONE;
|
||||
kfree(s);
|
||||
break;
|
||||
|
||||
case Opt_access:
|
||||
s = match_strdup(&args[0]);
|
||||
if (!s) {
|
||||
P9_DPRINTK(P9_DEBUG_ERROR,
|
||||
"failed to allocate copy"
|
||||
" of option argument\n");
|
||||
ret = -ENOMEM;
|
||||
break;
|
||||
}
|
||||
if (!s)
|
||||
goto fail_option_alloc;
|
||||
|
||||
v9ses->flags &= ~V9FS_ACCESS_MASK;
|
||||
if (strcmp(s, "user") == 0)
|
||||
v9ses->flags |= V9FS_ACCESS_USER;
|
||||
|
|
@ -173,6 +196,11 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
|
|||
}
|
||||
kfree(options);
|
||||
return ret;
|
||||
|
||||
fail_option_alloc:
|
||||
P9_DPRINTK(P9_DEBUG_ERROR,
|
||||
"failed to allocate copy of option argument\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -200,6 +228,10 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
|
|||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
spin_lock(&v9fs_sessionlist_lock);
|
||||
list_add(&v9ses->slist, &v9fs_sessionlist);
|
||||
spin_unlock(&v9fs_sessionlist_lock);
|
||||
|
||||
v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
|
||||
strcpy(v9ses->uname, V9FS_DEFUSER);
|
||||
strcpy(v9ses->aname, V9FS_DEFANAME);
|
||||
|
|
@ -249,6 +281,11 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
|
|||
else
|
||||
fid->uid = ~0;
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
/* register the session for caching */
|
||||
v9fs_cache_session_get_cookie(v9ses);
|
||||
#endif
|
||||
|
||||
return fid;
|
||||
|
||||
error:
|
||||
|
|
@ -268,8 +305,18 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
|
|||
v9ses->clnt = NULL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
if (v9ses->fscache) {
|
||||
v9fs_cache_session_put_cookie(v9ses);
|
||||
kfree(v9ses->cachetag);
|
||||
}
|
||||
#endif
|
||||
__putname(v9ses->uname);
|
||||
__putname(v9ses->aname);
|
||||
|
||||
spin_lock(&v9fs_sessionlist_lock);
|
||||
list_del(&v9ses->slist);
|
||||
spin_unlock(&v9fs_sessionlist_lock);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -286,25 +333,132 @@ void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
|
|||
|
||||
extern int v9fs_error_init(void);
|
||||
|
||||
static struct kobject *v9fs_kobj;
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
/**
|
||||
* v9fs_init - Initialize module
|
||||
* caches_show - list caches associated with a session
|
||||
*
|
||||
* Returns the size of buffer written.
|
||||
*/
|
||||
|
||||
static ssize_t caches_show(struct kobject *kobj,
|
||||
struct kobj_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
ssize_t n = 0, count = 0, limit = PAGE_SIZE;
|
||||
struct v9fs_session_info *v9ses;
|
||||
|
||||
spin_lock(&v9fs_sessionlist_lock);
|
||||
list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
|
||||
if (v9ses->cachetag) {
|
||||
n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
|
||||
if (n < 0) {
|
||||
count = n;
|
||||
break;
|
||||
}
|
||||
|
||||
count += n;
|
||||
limit -= n;
|
||||
}
|
||||
}
|
||||
|
||||
spin_unlock(&v9fs_sessionlist_lock);
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
|
||||
#endif /* CONFIG_9P_FSCACHE */
|
||||
|
||||
static struct attribute *v9fs_attrs[] = {
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
&v9fs_attr_cache.attr,
|
||||
#endif
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute_group v9fs_attr_group = {
|
||||
.attrs = v9fs_attrs,
|
||||
};
|
||||
|
||||
/**
|
||||
* v9fs_sysfs_init - Initialize the v9fs sysfs interface
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_sysfs_init(void)
|
||||
{
|
||||
v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
|
||||
if (!v9fs_kobj)
|
||||
return -ENOMEM;
|
||||
|
||||
if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
|
||||
kobject_put(v9fs_kobj);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_sysfs_cleanup(void)
|
||||
{
|
||||
sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
|
||||
kobject_put(v9fs_kobj);
|
||||
}
|
||||
|
||||
/**
|
||||
* init_v9fs - Initialize module
|
||||
*
|
||||
*/
|
||||
|
||||
static int __init init_v9fs(void)
|
||||
{
|
||||
int err;
|
||||
printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
|
||||
/* TODO: Setup list of registered trasnport modules */
|
||||
return register_filesystem(&v9fs_fs_type);
|
||||
err = register_filesystem(&v9fs_fs_type);
|
||||
if (err < 0) {
|
||||
printk(KERN_ERR "Failed to register filesystem\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
err = v9fs_cache_register();
|
||||
if (err < 0) {
|
||||
printk(KERN_ERR "Failed to register v9fs for caching\n");
|
||||
goto out_fs_unreg;
|
||||
}
|
||||
|
||||
err = v9fs_sysfs_init();
|
||||
if (err < 0) {
|
||||
printk(KERN_ERR "Failed to register with sysfs\n");
|
||||
goto out_sysfs_cleanup;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_sysfs_cleanup:
|
||||
v9fs_sysfs_cleanup();
|
||||
|
||||
out_fs_unreg:
|
||||
unregister_filesystem(&v9fs_fs_type);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_init - shutdown module
|
||||
* exit_v9fs - shutdown module
|
||||
*
|
||||
*/
|
||||
|
||||
static void __exit exit_v9fs(void)
|
||||
{
|
||||
v9fs_sysfs_cleanup();
|
||||
v9fs_cache_unregister();
|
||||
unregister_filesystem(&v9fs_fs_type);
|
||||
}
|
||||
|
||||
|
|
|
|||
13
fs/9p/v9fs.h
13
fs/9p/v9fs.h
|
|
@ -51,6 +51,7 @@ enum p9_session_flags {
|
|||
enum p9_cache_modes {
|
||||
CACHE_NONE,
|
||||
CACHE_LOOSE,
|
||||
CACHE_FSCACHE,
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -60,6 +61,8 @@ enum p9_cache_modes {
|
|||
* @debug: debug level
|
||||
* @afid: authentication handle
|
||||
* @cache: cache mode of type &p9_cache_modes
|
||||
* @cachetag: the tag of the cache associated with this session
|
||||
* @fscache: session cookie associated with FS-Cache
|
||||
* @options: copy of options string given by user
|
||||
* @uname: string user name to mount hierarchy as
|
||||
* @aname: mount specifier for remote hierarchy
|
||||
|
|
@ -68,7 +71,7 @@ enum p9_cache_modes {
|
|||
* @dfltgid: default numeric groupid to mount hierarchy as
|
||||
* @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
|
||||
* @clnt: reference to 9P network client instantiated for this session
|
||||
* @debugfs_dir: reference to debugfs_dir which can be used for add'l debug
|
||||
* @slist: reference to list of registered 9p sessions
|
||||
*
|
||||
* This structure holds state for each session instance established during
|
||||
* a sys_mount() .
|
||||
|
|
@ -84,6 +87,10 @@ struct v9fs_session_info {
|
|||
unsigned short debug;
|
||||
unsigned int afid;
|
||||
unsigned int cache;
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
char *cachetag;
|
||||
struct fscache_cookie *fscache;
|
||||
#endif
|
||||
|
||||
char *uname; /* user name to mount as */
|
||||
char *aname; /* name of remote hierarchy being mounted */
|
||||
|
|
@ -92,11 +99,9 @@ struct v9fs_session_info {
|
|||
unsigned int dfltgid; /* default gid for legacy support */
|
||||
u32 uid; /* if ACCESS_SINGLE, the uid that has access */
|
||||
struct p9_client *clnt; /* 9p client */
|
||||
struct dentry *debugfs_dir;
|
||||
struct list_head slist; /* list of sessions registered with v9fs */
|
||||
};
|
||||
|
||||
extern struct dentry *v9fs_debugfs_root;
|
||||
|
||||
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
|
||||
char *);
|
||||
void v9fs_session_close(struct v9fs_session_info *v9ses);
|
||||
|
|
|
|||
|
|
@ -44,7 +44,13 @@ extern const struct file_operations v9fs_dir_operations;
|
|||
extern const struct dentry_operations v9fs_dentry_operations;
|
||||
extern const struct dentry_operations v9fs_cached_dentry_operations;
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
struct inode *v9fs_alloc_inode(struct super_block *sb);
|
||||
void v9fs_destroy_inode(struct inode *inode);
|
||||
#endif
|
||||
|
||||
struct inode *v9fs_get_inode(struct super_block *sb, int mode);
|
||||
void v9fs_clear_inode(struct inode *inode);
|
||||
ino_t v9fs_qid2ino(struct p9_qid *qid);
|
||||
void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
|
||||
int v9fs_dir_release(struct inode *inode, struct file *filp);
|
||||
|
|
|
|||
|
|
@ -38,6 +38,7 @@
|
|||
|
||||
#include "v9fs.h"
|
||||
#include "v9fs_vfs.h"
|
||||
#include "cache.h"
|
||||
|
||||
/**
|
||||
* v9fs_vfs_readpage - read an entire page in from 9P
|
||||
|
|
@ -52,18 +53,31 @@ static int v9fs_vfs_readpage(struct file *filp, struct page *page)
|
|||
int retval;
|
||||
loff_t offset;
|
||||
char *buffer;
|
||||
struct inode *inode;
|
||||
|
||||
inode = page->mapping->host;
|
||||
P9_DPRINTK(P9_DEBUG_VFS, "\n");
|
||||
|
||||
BUG_ON(!PageLocked(page));
|
||||
|
||||
retval = v9fs_readpage_from_fscache(inode, page);
|
||||
if (retval == 0)
|
||||
return retval;
|
||||
|
||||
buffer = kmap(page);
|
||||
offset = page_offset(page);
|
||||
|
||||
retval = v9fs_file_readn(filp, buffer, NULL, PAGE_CACHE_SIZE, offset);
|
||||
if (retval < 0)
|
||||
if (retval < 0) {
|
||||
v9fs_uncache_page(inode, page);
|
||||
goto done;
|
||||
}
|
||||
|
||||
memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval);
|
||||
flush_dcache_page(page);
|
||||
SetPageUptodate(page);
|
||||
|
||||
v9fs_readpage_to_fscache(inode, page);
|
||||
retval = 0;
|
||||
|
||||
done:
|
||||
|
|
@ -72,6 +86,78 @@ static int v9fs_vfs_readpage(struct file *filp, struct page *page)
|
|||
return retval;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_vfs_readpages - read a set of pages from 9P
|
||||
*
|
||||
* @filp: file being read
|
||||
* @mapping: the address space
|
||||
* @pages: list of pages to read
|
||||
* @nr_pages: count of pages to read
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_vfs_readpages(struct file *filp, struct address_space *mapping,
|
||||
struct list_head *pages, unsigned nr_pages)
|
||||
{
|
||||
int ret = 0;
|
||||
struct inode *inode;
|
||||
|
||||
inode = mapping->host;
|
||||
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, filp);
|
||||
|
||||
ret = v9fs_readpages_from_fscache(inode, mapping, pages, &nr_pages);
|
||||
if (ret == 0)
|
||||
return ret;
|
||||
|
||||
ret = read_cache_pages(mapping, pages, (void *)v9fs_vfs_readpage, filp);
|
||||
P9_DPRINTK(P9_DEBUG_VFS, " = %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_release_page - release the private state associated with a page
|
||||
*
|
||||
* Returns 1 if the page can be released, false otherwise.
|
||||
*/
|
||||
|
||||
static int v9fs_release_page(struct page *page, gfp_t gfp)
|
||||
{
|
||||
if (PagePrivate(page))
|
||||
return 0;
|
||||
|
||||
return v9fs_fscache_release_page(page, gfp);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_invalidate_page - Invalidate a page completely or partially
|
||||
*
|
||||
* @page: structure to page
|
||||
* @offset: offset in the page
|
||||
*/
|
||||
|
||||
static void v9fs_invalidate_page(struct page *page, unsigned long offset)
|
||||
{
|
||||
if (offset == 0)
|
||||
v9fs_fscache_invalidate_page(page);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_launder_page - Writeback a dirty page
|
||||
* Since the writes go directly to the server, we simply return a 0
|
||||
* here to indicate success.
|
||||
*
|
||||
* Returns 0 on success.
|
||||
*/
|
||||
|
||||
static int v9fs_launder_page(struct page *page)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
const struct address_space_operations v9fs_addr_operations = {
|
||||
.readpage = v9fs_vfs_readpage,
|
||||
.readpages = v9fs_vfs_readpages,
|
||||
.releasepage = v9fs_release_page,
|
||||
.invalidatepage = v9fs_invalidate_page,
|
||||
.launder_page = v9fs_launder_page,
|
||||
};
|
||||
|
|
|
|||
|
|
@ -41,6 +41,7 @@
|
|||
#include "v9fs.h"
|
||||
#include "v9fs_vfs.h"
|
||||
#include "fid.h"
|
||||
#include "cache.h"
|
||||
|
||||
static const struct file_operations v9fs_cached_file_operations;
|
||||
|
||||
|
|
@ -86,6 +87,10 @@ int v9fs_file_open(struct inode *inode, struct file *file)
|
|||
/* enable cached file options */
|
||||
if(file->f_op == &v9fs_file_operations)
|
||||
file->f_op = &v9fs_cached_file_operations;
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
v9fs_cache_inode_set_cookie(inode, file);
|
||||
#endif
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
|
@ -238,8 +243,9 @@ v9fs_file_write(struct file *filp, const char __user * data,
|
|||
if (total > 0) {
|
||||
pg_start = origin >> PAGE_CACHE_SHIFT;
|
||||
pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
|
||||
invalidate_inode_pages2_range(inode->i_mapping, pg_start,
|
||||
pg_end);
|
||||
if (inode->i_mapping && inode->i_mapping->nrpages)
|
||||
invalidate_inode_pages2_range(inode->i_mapping,
|
||||
pg_start, pg_end);
|
||||
*offset += total;
|
||||
i_size_write(inode, i_size_read(inode) + total);
|
||||
inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
|
||||
|
|
|
|||
|
|
@ -40,6 +40,7 @@
|
|||
#include "v9fs.h"
|
||||
#include "v9fs_vfs.h"
|
||||
#include "fid.h"
|
||||
#include "cache.h"
|
||||
|
||||
static const struct inode_operations v9fs_dir_inode_operations;
|
||||
static const struct inode_operations v9fs_dir_inode_operations_ext;
|
||||
|
|
@ -197,6 +198,39 @@ v9fs_blank_wstat(struct p9_wstat *wstat)
|
|||
wstat->extension = NULL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
/**
|
||||
* v9fs_alloc_inode - helper function to allocate an inode
|
||||
* This callback is executed before setting up the inode so that we
|
||||
* can associate a vcookie with each inode.
|
||||
*
|
||||
*/
|
||||
|
||||
struct inode *v9fs_alloc_inode(struct super_block *sb)
|
||||
{
|
||||
struct v9fs_cookie *vcookie;
|
||||
vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
|
||||
GFP_KERNEL);
|
||||
if (!vcookie)
|
||||
return NULL;
|
||||
|
||||
vcookie->fscache = NULL;
|
||||
vcookie->qid = NULL;
|
||||
spin_lock_init(&vcookie->lock);
|
||||
return &vcookie->inode;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_destroy_inode - destroy an inode
|
||||
*
|
||||
*/
|
||||
|
||||
void v9fs_destroy_inode(struct inode *inode)
|
||||
{
|
||||
kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
|
||||
}
|
||||
#endif
|
||||
|
||||
/**
|
||||
* v9fs_get_inode - helper function to setup an inode
|
||||
* @sb: superblock
|
||||
|
|
@ -326,6 +360,21 @@ v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
|
|||
}
|
||||
*/
|
||||
|
||||
|
||||
/**
|
||||
* v9fs_clear_inode - release an inode
|
||||
* @inode: inode to release
|
||||
*
|
||||
*/
|
||||
void v9fs_clear_inode(struct inode *inode)
|
||||
{
|
||||
filemap_fdatawrite(inode->i_mapping);
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
v9fs_cache_inode_put_cookie(inode);
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_inode_from_fid - populate an inode by issuing a attribute request
|
||||
* @v9ses: session information
|
||||
|
|
@ -356,8 +405,14 @@ v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
|
|||
|
||||
v9fs_stat2inode(st, ret, sb);
|
||||
ret->i_ino = v9fs_qid2ino(&st->qid);
|
||||
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
v9fs_vcookie_set_qid(ret, &st->qid);
|
||||
v9fs_cache_inode_get_cookie(ret);
|
||||
#endif
|
||||
p9stat_free(st);
|
||||
kfree(st);
|
||||
|
||||
return ret;
|
||||
|
||||
error:
|
||||
|
|
@ -751,7 +806,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|||
P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
|
||||
err = -EPERM;
|
||||
v9ses = v9fs_inode2v9ses(dentry->d_inode);
|
||||
if (v9ses->cache == CACHE_LOOSE)
|
||||
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
|
||||
return simple_getattr(mnt, dentry, stat);
|
||||
|
||||
fid = v9fs_fid_lookup(dentry);
|
||||
|
|
|
|||
|
|
@ -44,20 +44,8 @@
|
|||
#include "v9fs_vfs.h"
|
||||
#include "fid.h"
|
||||
|
||||
static void v9fs_clear_inode(struct inode *);
|
||||
static const struct super_operations v9fs_super_ops;
|
||||
|
||||
/**
|
||||
* v9fs_clear_inode - release an inode
|
||||
* @inode: inode to release
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_clear_inode(struct inode *inode)
|
||||
{
|
||||
filemap_fdatawrite(inode->i_mapping);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_set_super - set the superblock
|
||||
* @s: super block
|
||||
|
|
@ -220,6 +208,10 @@ v9fs_umount_begin(struct super_block *sb)
|
|||
}
|
||||
|
||||
static const struct super_operations v9fs_super_ops = {
|
||||
#ifdef CONFIG_9P_FSCACHE
|
||||
.alloc_inode = v9fs_alloc_inode,
|
||||
.destroy_inode = v9fs_destroy_inode,
|
||||
#endif
|
||||
.statfs = simple_statfs,
|
||||
.clear_inode = v9fs_clear_inode,
|
||||
.show_options = generic_show_options,
|
||||
|
|
|
|||
|
|
@ -38,6 +38,8 @@
|
|||
* @P9_DEBUG_SLABS: memory management tracing
|
||||
* @P9_DEBUG_FCALL: verbose dump of protocol messages
|
||||
* @P9_DEBUG_FID: fid allocation/deallocation tracking
|
||||
* @P9_DEBUG_PKT: packet marshalling/unmarshalling
|
||||
* @P9_DEBUG_FSC: FS-cache tracing
|
||||
*
|
||||
* These flags are passed at mount time to turn on various levels of
|
||||
* verbosity and tracing which will be output to the system logs.
|
||||
|
|
@ -54,6 +56,7 @@ enum p9_debug_flags {
|
|||
P9_DEBUG_FCALL = (1<<8),
|
||||
P9_DEBUG_FID = (1<<9),
|
||||
P9_DEBUG_PKT = (1<<10),
|
||||
P9_DEBUG_FSC = (1<<11),
|
||||
};
|
||||
|
||||
#ifdef CONFIG_NET_9P_DEBUG
|
||||
|
|
|
|||
Loading…
Reference in a new issue