#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; struct rw_semaphore nf_rwsem; }; 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); int nfsd_file_cache_stats_open(struct inode *, struct file *); #endif /* _FS_NFSD_FILECACHE_H */