Commit a78ce05d authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Eric Van Hensbergen
Browse files

fs/9p: Add v9fs_inode



Switch to the fscache code to v9fs_inode. We will later use
v9fs_inode in cache=loose mode to track the inode cache
validity timeout. Ie if we find an inode in cache older
that a specific jiffie range we will consider it stale
Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarVenkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent a1211908
......@@ -33,67 +33,11 @@
#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.
......@@ -133,9 +77,9 @@ static uint16_t v9fs_cache_session_get_key(const void *cookie_netfs_data,
}
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,
.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)
......@@ -163,33 +107,33 @@ void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses)
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);
const struct v9fs_inode *v9inode = cookie_netfs_data;
memcpy(buffer, &v9inode->fscache_key->path,
sizeof(v9inode->fscache_key->path));
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get key %llu", &v9inode->vfs_inode,
v9inode->fscache_key->path);
return sizeof(v9inode->fscache_key->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);
const struct v9fs_inode *v9inode = cookie_netfs_data;
*size = i_size_read(&v9inode->vfs_inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get attr %llu", &vcookie->inode,
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get attr %llu", &v9inode->vfs_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);
const struct v9fs_inode *v9inode = cookie_netfs_data;
memcpy(buffer, &v9inode->fscache_key->version,
sizeof(v9inode->fscache_key->version));
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get aux %u", &v9inode->vfs_inode,
v9inode->fscache_key->version);
return sizeof(v9inode->fscache_key->version);
}
static enum
......@@ -197,13 +141,13 @@ 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;
const struct v9fs_inode *v9inode = cookie_netfs_data;
if (buflen != sizeof(vcookie->qid->version))
if (buflen != sizeof(v9inode->fscache_key->version))
return FSCACHE_CHECKAUX_OBSOLETE;
if (memcmp(buffer, &vcookie->qid->version,
sizeof(vcookie->qid->version)))
if (memcmp(buffer, &v9inode->fscache_key->version,
sizeof(v9inode->fscache_key->version)))
return FSCACHE_CHECKAUX_OBSOLETE;
return FSCACHE_CHECKAUX_OKAY;
......@@ -211,7 +155,7 @@ fscache_checkaux v9fs_cache_inode_check_aux(void *cookie_netfs_data,
static void v9fs_cache_inode_now_uncached(void *cookie_netfs_data)
{
struct v9fs_cookie *vcookie = cookie_netfs_data;
struct v9fs_inode *v9inode = cookie_netfs_data;
struct pagevec pvec;
pgoff_t first;
int loop, nr_pages;
......@@ -220,7 +164,7 @@ static void v9fs_cache_inode_now_uncached(void *cookie_netfs_data)
first = 0;
for (;;) {
nr_pages = pagevec_lookup(&pvec, vcookie->inode.i_mapping,
nr_pages = pagevec_lookup(&pvec, v9inode->vfs_inode.i_mapping,
first,
PAGEVEC_SIZE - pagevec_count(&pvec));
if (!nr_pages)
......@@ -249,115 +193,114 @@ const struct fscache_cookie_def v9fs_cache_inode_index_def = {
void v9fs_cache_inode_get_cookie(struct inode *inode)
{
struct v9fs_cookie *vcookie;
struct v9fs_inode *v9inode;
struct v9fs_session_info *v9ses;
if (!S_ISREG(inode->i_mode))
return;
vcookie = v9fs_inode2cookie(inode);
if (vcookie->fscache)
v9inode = V9FS_I(inode);
if (v9inode->fscache)
return;
v9ses = v9fs_inode2v9ses(inode);
vcookie->fscache = fscache_acquire_cookie(v9ses->fscache,
v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
&v9fs_cache_inode_index_def,
vcookie);
v9inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p get cookie %p", inode,
vcookie->fscache);
v9inode->fscache);
}
void v9fs_cache_inode_put_cookie(struct inode *inode)
{
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
struct v9fs_inode *v9inode = V9FS_I(inode);
if (!vcookie->fscache)
if (!v9inode->fscache)
return;
P9_DPRINTK(P9_DEBUG_FSC, "inode %p put cookie %p", inode,
vcookie->fscache);
v9inode->fscache);
fscache_relinquish_cookie(vcookie->fscache, 0);
vcookie->fscache = NULL;
fscache_relinquish_cookie(v9inode->fscache, 0);
v9inode->fscache = NULL;
}
void v9fs_cache_inode_flush_cookie(struct inode *inode)
{
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
struct v9fs_inode *v9inode = V9FS_I(inode);
if (!vcookie->fscache)
if (!v9inode->fscache)
return;
P9_DPRINTK(P9_DEBUG_FSC, "inode %p flush cookie %p", inode,
vcookie->fscache);
v9inode->fscache);
fscache_relinquish_cookie(vcookie->fscache, 1);
vcookie->fscache = NULL;
fscache_relinquish_cookie(v9inode->fscache, 1);
v9inode->fscache = NULL;
}
void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp)
{
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
struct v9fs_inode *v9inode = V9FS_I(inode);
struct p9_fid *fid;
if (!vcookie->fscache)
if (!v9inode->fscache)
return;
spin_lock(&vcookie->lock);
spin_lock(&v9inode->fscache_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);
spin_unlock(&v9inode->fscache_lock);
}
void v9fs_cache_inode_reset_cookie(struct inode *inode)
{
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
struct v9fs_inode *v9inode = V9FS_I(inode);
struct v9fs_session_info *v9ses;
struct fscache_cookie *old;
if (!vcookie->fscache)
if (!v9inode->fscache)
return;
old = vcookie->fscache;
old = v9inode->fscache;
spin_lock(&vcookie->lock);
fscache_relinquish_cookie(vcookie->fscache, 1);
spin_lock(&v9inode->fscache_lock);
fscache_relinquish_cookie(v9inode->fscache, 1);
v9ses = v9fs_inode2v9ses(inode);
vcookie->fscache = fscache_acquire_cookie(v9ses->fscache,
v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
&v9fs_cache_inode_index_def,
vcookie);
v9inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p",
inode, old, vcookie->fscache);
inode, old, v9inode->fscache);
spin_unlock(&vcookie->lock);
spin_unlock(&v9inode->fscache_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);
struct v9fs_inode *v9inode = V9FS_I(inode);
BUG_ON(!vcookie->fscache);
BUG_ON(!v9inode->fscache);
return fscache_maybe_release_page(vcookie->fscache, page, gfp);
return fscache_maybe_release_page(v9inode->fscache, page, gfp);
}
void __v9fs_fscache_invalidate_page(struct page *page)
{
struct inode *inode = page->mapping->host;
struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
struct v9fs_inode *v9inode = V9FS_I(inode);
BUG_ON(!vcookie->fscache);
BUG_ON(!v9inode->fscache);
if (PageFsCache(page)) {
fscache_wait_on_page_write(vcookie->fscache, page);
fscache_wait_on_page_write(v9inode->fscache, page);
BUG_ON(!PageLocked(page));
fscache_uncache_page(vcookie->fscache, page);
fscache_uncache_page(v9inode->fscache, page);
}
}
......@@ -380,13 +323,13 @@ static void v9fs_vfs_readpage_complete(struct page *page, void *data,
int __v9fs_readpage_from_fscache(struct inode *inode, struct page *page)
{
int ret;
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
const struct v9fs_inode *v9inode = V9FS_I(inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
if (!vcookie->fscache)
if (!v9inode->fscache)
return -ENOBUFS;
ret = fscache_read_or_alloc_page(vcookie->fscache,
ret = fscache_read_or_alloc_page(v9inode->fscache,
page,
v9fs_vfs_readpage_complete,
NULL,
......@@ -418,13 +361,13 @@ int __v9fs_readpages_from_fscache(struct inode *inode,
unsigned *nr_pages)
{
int ret;
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
const struct v9fs_inode *v9inode = V9FS_I(inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p pages %u", inode, *nr_pages);
if (!vcookie->fscache)
if (!v9inode->fscache)
return -ENOBUFS;
ret = fscache_read_or_alloc_pages(vcookie->fscache,
ret = fscache_read_or_alloc_pages(v9inode->fscache,
mapping, pages, nr_pages,
v9fs_vfs_readpage_complete,
NULL,
......@@ -453,10 +396,10 @@ int __v9fs_readpages_from_fscache(struct inode *inode,
void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page)
{
int ret;
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
const struct v9fs_inode *v9inode = V9FS_I(inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
ret = fscache_write_page(vcookie->fscache, page, GFP_KERNEL);
ret = fscache_write_page(v9inode->fscache, page, GFP_KERNEL);
P9_DPRINTK(P9_DEBUG_FSC, "ret = %d", ret);
if (ret != 0)
v9fs_uncache_page(inode, page);
......@@ -467,8 +410,8 @@ void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page)
*/
void __v9fs_fscache_wait_on_page_write(struct inode *inode, struct page *page)
{
const struct v9fs_cookie *vcookie = v9fs_inode2cookie(inode);
const struct v9fs_inode *v9inode = V9FS_I(inode);
P9_DPRINTK(P9_DEBUG_FSC, "inode %p page %p", inode, page);
if (PageFsCache(page))
fscache_wait_on_page_write(vcookie->fscache, page);
fscache_wait_on_page_write(v9inode->fscache, page);
}
......@@ -25,20 +25,6 @@
#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;
......@@ -66,21 +52,6 @@ extern int __v9fs_readpages_from_fscache(struct inode *inode,
extern void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page);
extern void __v9fs_fscache_wait_on_page_write(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)
......@@ -117,18 +88,18 @@ static inline void v9fs_readpage_to_fscache(struct inode *inode,
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);
struct v9fs_inode *v9inode = V9FS_I(inode);
fscache_uncache_page(v9inode->fscache, page);
BUG_ON(PageFsCache(page));
}
static inline void v9fs_vcookie_set_qid(struct inode *inode,
static inline void v9fs_fscache_set_key(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);
struct v9fs_inode *v9inode = V9FS_I(inode);
spin_lock(&v9inode->fscache_lock);
v9inode->fscache_key = qid;
spin_unlock(&v9inode->fscache_lock);
}
static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
......@@ -139,13 +110,6 @@ static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
#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;
......@@ -174,10 +138,6 @@ static inline void v9fs_readpage_to_fscache(struct inode *inode,
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)
{}
static inline void v9fs_fscache_wait_on_page_write(struct inode *inode,
struct page *page)
{
......
......@@ -39,6 +39,7 @@
static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
static LIST_HEAD(v9fs_sessionlist);
struct kmem_cache *v9fs_inode_cache;
/*
* Option Parsing (code inspired by NFS code)
......@@ -481,6 +482,63 @@ static void v9fs_sysfs_cleanup(void)
kobject_put(v9fs_kobj);
}
static void v9fs_inode_init_once(void *foo)
{
struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
#ifdef CONFIG_9P_FSCACHE
v9inode->fscache = NULL;
v9inode->fscache_key = NULL;
#endif
inode_init_once(&v9inode->vfs_inode);
}
/**
* v9fs_init_inode_cache - initialize a cache for 9P
* Returns 0 on success.
*/
static int v9fs_init_inode_cache(void)
{
v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
sizeof(struct v9fs_inode),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
v9fs_inode_init_once);
if (!v9fs_inode_cache)
return -ENOMEM;
return 0;
}
/**
* v9fs_destroy_inode_cache - destroy the cache of 9P inode
*
*/
static void v9fs_destroy_inode_cache(void)
{
kmem_cache_destroy(v9fs_inode_cache);
}
static int v9fs_cache_register(void)
{
int ret;
ret = v9fs_init_inode_cache();
if (ret < 0)
return ret;
#ifdef CONFIG_9P_FSCACHE
return fscache_register_netfs(&v9fs_cache_netfs);
#else
return ret;
#endif
}
static void v9fs_cache_unregister(void)
{
v9fs_destroy_inode_cache();
#ifdef CONFIG_9P_FSCACHE
fscache_unregister_netfs(&v9fs_cache_netfs);
#endif
}
/**
* init_v9fs - Initialize module
*
......
......@@ -116,6 +116,20 @@ struct v9fs_session_info {
struct p9_fid *root_fid; /* Used for file system sync */
};
struct v9fs_inode {
#ifdef CONFIG_9P_FSCACHE
spinlock_t fscache_lock;
struct fscache_cookie *fscache;
struct p9_qid *fscache_key;
#endif
struct inode vfs_inode;
};
static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
{
return container_of(inode, struct v9fs_inode, vfs_inode);
}
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
char *);
extern void v9fs_session_close(struct v9fs_session_info *v9ses);
......@@ -129,16 +143,15 @@ extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd,
void *p);
extern struct inode *v9fs_inode(struct v9fs_session_info *v9ses,
struct p9_fid *fid,
struct super_block *sb);
extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
struct p9_fid *fid,
struct super_block *sb);
extern const struct inode_operations v9fs_dir_inode_operations_dotl;
extern const struct inode_operations v9fs_file_inode_operations_dotl;
extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
extern struct inode *v9fs_inode_dotl(struct v9fs_session_info *v9ses,
struct p9_fid *fid,
struct super_block *sb);
extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,
struct p9_fid *fid,
struct super_block *sb);
/* other default globals */
#define V9FS_PORT 564
......@@ -163,7 +176,7 @@ static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
}
/**
* v9fs_inode_from_fid - Helper routine to populate an inode by
* v9fs_get_inode_from_fid - Helper routine to populate an inode by
* issuing a attribute request
* @v9ses: session information
* @fid: fid to issue attribute request for
......@@ -171,11 +184,11 @@ static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
*
*/
static inline struct inode *
v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
struct super_block *sb)
v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
struct super_block *sb)
{
if (v9fs_proto_dotl(v9ses))
return v9fs_inode_dotl(v9ses, fid, sb);
return v9fs_inode_from_fid_dotl(v9ses, fid, sb);
else
return v9fs_inode(v9ses, fid, sb);
return v9fs_inode_from_fid(v9ses, fid, sb);
}
......@@ -47,12 +47,10 @@ extern const struct dentry_operations v9fs_dentry_operations;
extern const struct dentry_operations v9fs_cached_dentry_operations;
extern const struct file_operations v9fs_cached_file_operations;
extern const struct file_operations v9fs_cached_file_operations_dotl;
extern struct kmem_cache *v9fs_inode_cache;
#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);
int v9fs_init_inode(struct v9fs_session_info *v9ses,