Commit 7f8e05f6 authored by David Howells's avatar David Howells

NFS: Store pages from an NFS inode into a local cache

Store pages from an NFS inode into the cache data storage object associated
with that inode.
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarSteve Dickson <steved@redhat.com>
Acked-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Tested-by: default avatarDaire Byrne <Daire.Byrne@framestore.com>
parent 9a9fc1c0
...@@ -493,3 +493,31 @@ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx, ...@@ -493,3 +493,31 @@ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx,
return ret; return ret;
} }
/*
* Store a newly fetched page in fscache
* - PG_fscache must be set on the page
*/
void __nfs_readpage_to_fscache(struct inode *inode, struct page *page, int sync)
{
int ret;
dfprintk(FSCACHE,
"NFS: readpage_to_fscache(fsc:%p/p:%p(i:%lx f:%lx)/%d)\n",
NFS_I(inode)->fscache, page, page->index, page->flags, sync);
ret = fscache_write_page(NFS_I(inode)->fscache, page, GFP_KERNEL);
dfprintk(FSCACHE,
"NFS: readpage_to_fscache: p:%p(i:%lu f:%lx) ret %d\n",
page, page->index, page->flags, ret);
if (ret != 0) {
fscache_uncache_page(NFS_I(inode)->fscache, page);
nfs_add_fscache_stats(inode,
NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL, 1);
nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
} else {
nfs_add_fscache_stats(inode,
NFSIOS_FSCACHE_PAGES_WRITTEN_OK, 1);
}
}
...@@ -91,6 +91,7 @@ extern int __nfs_readpage_from_fscache(struct nfs_open_context *, ...@@ -91,6 +91,7 @@ extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
extern int __nfs_readpages_from_fscache(struct nfs_open_context *, extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
struct inode *, struct address_space *, struct inode *, struct address_space *,
struct list_head *, unsigned *); struct list_head *, unsigned *);
extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
/* /*
* wait for a page to complete writing to the cache * wait for a page to complete writing to the cache
...@@ -140,6 +141,19 @@ static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx, ...@@ -140,6 +141,19 @@ static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
return -ENOBUFS; return -ENOBUFS;
} }
/*
* Store a page newly fetched from the server in an inode data storage object
* in the cache.
*/
static inline void nfs_readpage_to_fscache(struct inode *inode,
struct page *page,
int sync)
{
if (PageFsCache(page))
__nfs_readpage_to_fscache(inode, page, sync);
}
#else /* CONFIG_NFS_FSCACHE */ #else /* CONFIG_NFS_FSCACHE */
static inline int nfs_fscache_register(void) { return 0; } static inline int nfs_fscache_register(void) { return 0; }
static inline void nfs_fscache_unregister(void) {} static inline void nfs_fscache_unregister(void) {}
...@@ -184,6 +198,8 @@ static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx, ...@@ -184,6 +198,8 @@ static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
{ {
return -ENOBUFS; return -ENOBUFS;
} }
static inline void nfs_readpage_to_fscache(struct inode *inode,
struct page *page, int sync) {}
#endif /* CONFIG_NFS_FSCACHE */ #endif /* CONFIG_NFS_FSCACHE */
#endif /* _NFS_FSCACHE_H */ #endif /* _NFS_FSCACHE_H */
...@@ -140,6 +140,11 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode, ...@@ -140,6 +140,11 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
static void nfs_readpage_release(struct nfs_page *req) static void nfs_readpage_release(struct nfs_page *req)
{ {
struct inode *d_inode = req->wb_context->path.dentry->d_inode;
if (PageUptodate(req->wb_page))
nfs_readpage_to_fscache(d_inode, req->wb_page, 0);
unlock_page(req->wb_page); unlock_page(req->wb_page);
dprintk("NFS: read done (%s/%Ld %d@%Ld)\n", dprintk("NFS: read done (%s/%Ld %d@%Ld)\n",
......
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