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| author | David Howells <dhowells@redhat.com> | 2009-04-03 16:42:44 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2009-04-03 16:42:44 +0100 |
| commit | 545db45f0fc0d4203b045047798ce156972a3056 (patch) | |
| tree | 783db1091f5d6f21dafece81f6c94caf0aec98b8 /fs/nfs/fscache.h | |
| parent | 6a51091d0775cdc4a923f2172c61925ad416aa32 (diff) | |
| download | linux-545db45f0fc0d4203b045047798ce156972a3056.tar.gz linux-545db45f0fc0d4203b045047798ce156972a3056.tar.bz2 linux-545db45f0fc0d4203b045047798ce156972a3056.zip | |
NFS: FS-Cache page management
FS-Cache page management for NFS. This includes hooking the releasing and
invalidation of pages marked with PG_fscache (aka PG_private_2) and waiting for
completion of the write-to-cache flag (PG_fscache_write aka PG_owner_priv_2).
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
Diffstat (limited to 'fs/nfs/fscache.h')
| -rw-r--r-- | fs/nfs/fscache.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h index 8b4299a0ad61..e29613a8cbd2 100644 --- a/fs/nfs/fscache.h +++ b/fs/nfs/fscache.h @@ -83,6 +83,31 @@ extern void nfs_fscache_zap_inode_cookie(struct inode *); extern void nfs_fscache_set_inode_cookie(struct inode *, struct file *); extern void nfs_fscache_reset_inode_cookie(struct inode *); +extern void __nfs_fscache_invalidate_page(struct page *, struct inode *); +extern int nfs_fscache_release_page(struct page *, gfp_t); + +/* + * wait for a page to complete writing to the cache + */ +static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi, + struct page *page) +{ + if (PageFsCache(page)) + fscache_wait_on_page_write(nfsi->fscache, page); +} + +/* + * release the caching state associated with a page if undergoing complete page + * invalidation + */ +static inline void nfs_fscache_invalidate_page(struct page *page, + struct inode *inode) +{ + if (PageFsCache(page)) + __nfs_fscache_invalidate_page(page, inode); +} + + #else /* CONFIG_NFS_FSCACHE */ static inline int nfs_fscache_register(void) { return 0; } static inline void nfs_fscache_unregister(void) {} @@ -104,5 +129,14 @@ static inline void nfs_fscache_set_inode_cookie(struct inode *inode, struct file *filp) {} static inline void nfs_fscache_reset_inode_cookie(struct inode *inode) {} +static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp) +{ + return 1; /* True: may release page */ +} +static inline void nfs_fscache_invalidate_page(struct page *page, + struct inode *inode) {} +static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi, + struct page *page) {} + #endif /* CONFIG_NFS_FSCACHE */ #endif /* _NFS_FSCACHE_H */ |