165294c1fSJeff Layton #ifndef _FS_NFSD_FILECACHE_H 265294c1fSJeff Layton #define _FS_NFSD_FILECACHE_H 365294c1fSJeff Layton 465294c1fSJeff Layton #include <linux/fsnotify_backend.h> 565294c1fSJeff Layton 665294c1fSJeff Layton /* 765294c1fSJeff Layton * This is the fsnotify_mark container that nfsd attaches to the files that it 865294c1fSJeff Layton * is holding open. Note that we have a separate refcount here aside from the 965294c1fSJeff Layton * one in the fsnotify_mark. We only want a single fsnotify_mark attached to 1065294c1fSJeff Layton * the inode, and for each nfsd_file to hold a reference to it. 1165294c1fSJeff Layton * 1265294c1fSJeff Layton * The fsnotify_mark is itself refcounted, but that's not sufficient to tell us 1365294c1fSJeff Layton * how to put that reference. If there are still outstanding nfsd_files that 1465294c1fSJeff Layton * reference the mark, then we would want to call fsnotify_put_mark on it. 1565294c1fSJeff Layton * If there were not, then we'd need to call fsnotify_destroy_mark. Since we 1665294c1fSJeff Layton * can't really tell the difference, we use the nfm_mark to keep track of how 1765294c1fSJeff Layton * many nfsd_files hold references to the mark. When that counter goes to zero 1865294c1fSJeff Layton * then we know to call fsnotify_destroy_mark on it. 1965294c1fSJeff Layton */ 2065294c1fSJeff Layton struct nfsd_file_mark { 2165294c1fSJeff Layton struct fsnotify_mark nfm_mark; 22689827cdSTrond Myklebust refcount_t nfm_ref; 2365294c1fSJeff Layton }; 2465294c1fSJeff Layton 2565294c1fSJeff Layton /* 2665294c1fSJeff Layton * A representation of a file that has been opened by knfsd. These are hashed 2765294c1fSJeff Layton * in the hashtable by inode pointer value. Note that this object doesn't 2865294c1fSJeff Layton * hold a reference to the inode by itself, so the nf_inode pointer should 2965294c1fSJeff Layton * never be dereferenced, only used for comparison. 3065294c1fSJeff Layton */ 3165294c1fSJeff Layton struct nfsd_file { 32c4c649abSChuck Lever struct rhlist_head nf_rlist; 33c4c649abSChuck Lever void *nf_inode; 3465294c1fSJeff Layton struct file *nf_file; 3565294c1fSJeff Layton const struct cred *nf_cred; 365e113224STrond Myklebust struct net *nf_net; 3765294c1fSJeff Layton #define NFSD_FILE_HASHED (0) 3865294c1fSJeff Layton #define NFSD_FILE_PENDING (1) 3923ba98deSJeff Layton #define NFSD_FILE_REFERENCED (2) 404d1ea845SChuck Lever #define NFSD_FILE_GC (3) 4165294c1fSJeff Layton unsigned long nf_flags; 42689827cdSTrond Myklebust refcount_t nf_ref; 4365294c1fSJeff Layton unsigned char nf_may; 44c4c649abSChuck Lever 4565294c1fSJeff Layton struct nfsd_file_mark *nf_mark; 46c4c649abSChuck Lever struct list_head nf_lru; 47*80d39b50SYouzhong Yang struct list_head nf_gc; 48c4c649abSChuck Lever struct rcu_head nf_rcu; 49904940e9SChuck Lever ktime_t nf_birthtime; 5065294c1fSJeff Layton }; 5165294c1fSJeff Layton 5265294c1fSJeff Layton int nfsd_file_cache_init(void); 535e113224STrond Myklebust void nfsd_file_cache_purge(struct net *); 5465294c1fSJeff Layton void nfsd_file_cache_shutdown(void); 559542e6a6STrond Myklebust int nfsd_file_cache_start_net(struct net *net); 569542e6a6STrond Myklebust void nfsd_file_cache_shutdown_net(struct net *net); 5765294c1fSJeff Layton void nfsd_file_put(struct nfsd_file *nf); 5865294c1fSJeff Layton struct nfsd_file *nfsd_file_get(struct nfsd_file *nf); 5965294c1fSJeff Layton void nfsd_file_close_inode_sync(struct inode *inode); 6065294c1fSJeff Layton bool nfsd_file_is_cached(struct inode *inode); 614d1ea845SChuck Lever __be32 nfsd_file_acquire_gc(struct svc_rqst *rqstp, struct svc_fh *fhp, 624d1ea845SChuck Lever unsigned int may_flags, struct nfsd_file **nfp); 6365294c1fSJeff Layton __be32 nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp, 6465294c1fSJeff Layton unsigned int may_flags, struct nfsd_file **nfp); 650b3a551fSJeff Layton __be32 nfsd_file_acquire_opened(struct svc_rqst *rqstp, struct svc_fh *fhp, 660b3a551fSJeff Layton unsigned int may_flags, struct file *file, 670b3a551fSJeff Layton struct nfsd_file **nfp); 681342f9ddSChenXiaoSong int nfsd_file_cache_stats_show(struct seq_file *m, void *v); 6965294c1fSJeff Layton #endif /* _FS_NFSD_FILECACHE_H */ 70