| #ifndef _FS_NFSD_FILECACHE_H |
| #define _FS_NFSD_FILECACHE_H |
| |
| #include <linux/fsnotify_backend.h> |
| |
| /* |
| * This is the fsnotify_mark container that nfsd attaches to the files that it |
| * is holding open. Note that we have a separate refcount here aside from the |
| * one in the fsnotify_mark. We only want a single fsnotify_mark attached to |
| * the inode, and for each nfsd_file to hold a reference to it. |
| * |
| * The fsnotify_mark is itself refcounted, but that's not sufficient to tell us |
| * how to put that reference. If there are still outstanding nfsd_files that |
| * reference the mark, then we would want to call fsnotify_put_mark on it. |
| * If there were not, then we'd need to call fsnotify_destroy_mark. Since we |
| * can't really tell the difference, we use the nfm_mark to keep track of how |
| * many nfsd_files hold references to the mark. When that counter goes to zero |
| * then we know to call fsnotify_destroy_mark on it. |
| */ |
| struct nfsd_file_mark { |
| struct fsnotify_mark nfm_mark; |
| refcount_t nfm_ref; |
| }; |
| |
| /* |
| * A representation of a file that has been opened by knfsd. These are hashed |
| * in the hashtable by inode pointer value. Note that this object doesn't |
| * hold a reference to the inode by itself, so the nf_inode pointer should |
| * never be dereferenced, only used for comparison. |
| */ |
| struct nfsd_file { |
| struct hlist_node nf_node; |
| struct list_head nf_lru; |
| struct rcu_head nf_rcu; |
| struct file *nf_file; |
| const struct cred *nf_cred; |
| struct net *nf_net; |
| #define NFSD_FILE_HASHED (0) |
| #define NFSD_FILE_PENDING (1) |
| #define NFSD_FILE_BREAK_READ (2) |
| #define NFSD_FILE_BREAK_WRITE (3) |
| #define NFSD_FILE_REFERENCED (4) |
| unsigned long nf_flags; |
| struct inode *nf_inode; |
| unsigned int nf_hashval; |
| refcount_t nf_ref; |
| unsigned char nf_may; |
| struct nfsd_file_mark *nf_mark; |
| }; |
| |
| int nfsd_file_cache_init(void); |
| void nfsd_file_cache_purge(struct net *); |
| void nfsd_file_cache_shutdown(void); |
| int nfsd_file_cache_start_net(struct net *net); |
| void nfsd_file_cache_shutdown_net(struct net *net); |
| void nfsd_file_put(struct nfsd_file *nf); |
| struct nfsd_file *nfsd_file_get(struct nfsd_file *nf); |
| void nfsd_file_close_inode_sync(struct inode *inode); |
| bool nfsd_file_is_cached(struct inode *inode); |
| __be32 nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| unsigned int may_flags, struct nfsd_file **nfp); |
| __be32 nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| unsigned int may_flags, struct nfsd_file **nfp); |
| int nfsd_file_cache_stats_open(struct inode *, struct file *); |
| #endif /* _FS_NFSD_FILECACHE_H */ |