1 #ifndef _FS_NFSD_FILECACHE_H 2 #define _FS_NFSD_FILECACHE_H 3 4 #include <linux/fsnotify_backend.h> 5 6 /* 7 * Limit the time that the list_lru_one lock is held during 8 * an LRU scan. 9 */ 10 #define NFSD_FILE_GC_BATCH (16UL) 11 12 /* 13 * This is the fsnotify_mark container that nfsd attaches to the files that it 14 * is holding open. Note that we have a separate refcount here aside from the 15 * one in the fsnotify_mark. We only want a single fsnotify_mark attached to 16 * the inode, and for each nfsd_file to hold a reference to it. 17 * 18 * The fsnotify_mark is itself refcounted, but that's not sufficient to tell us 19 * how to put that reference. If there are still outstanding nfsd_files that 20 * reference the mark, then we would want to call fsnotify_put_mark on it. 21 * If there were not, then we'd need to call fsnotify_destroy_mark. Since we 22 * can't really tell the difference, we use the nfm_mark to keep track of how 23 * many nfsd_files hold references to the mark. When that counter goes to zero 24 * then we know to call fsnotify_destroy_mark on it. 25 */ 26 struct nfsd_file_mark { 27 struct fsnotify_mark nfm_mark; 28 refcount_t nfm_ref; 29 /* serializes nfsd_fsnotify_recalc_mask() against itself */ 30 struct mutex nfm_recalc_mutex; 31 }; 32 33 /* 34 * A representation of a file that has been opened by knfsd. These are hashed 35 * in the hashtable by inode pointer value. Note that this object doesn't 36 * hold a reference to the inode by itself, so the nf_inode pointer should 37 * never be dereferenced, only used for comparison. 38 */ 39 struct nfsd_file { 40 struct rhlist_head nf_rlist; 41 void *nf_inode; 42 struct file *nf_file; 43 const struct cred *nf_cred; 44 struct net *nf_net; 45 #define NFSD_FILE_HASHED (0) 46 #define NFSD_FILE_PENDING (1) 47 #define NFSD_FILE_REFERENCED (2) 48 #define NFSD_FILE_GC (3) 49 #define NFSD_FILE_RECENT (4) 50 unsigned long nf_flags; 51 refcount_t nf_ref; 52 unsigned char nf_may; 53 54 struct nfsd_file_mark *nf_mark; 55 struct list_head nf_lru; 56 struct list_head nf_gc; 57 struct rcu_head nf_rcu; 58 ktime_t nf_birthtime; 59 60 u32 nf_dio_mem_align; 61 u32 nf_dio_offset_align; 62 u32 nf_dio_read_offset_align; 63 }; 64 65 int nfsd_file_cache_init(void); 66 void nfsd_file_cache_purge(struct net *); 67 void nfsd_file_cache_shutdown(void); 68 int nfsd_file_cache_start_net(struct net *net); 69 void nfsd_file_cache_shutdown_net(struct net *net); 70 void nfsd_file_put(struct nfsd_file *nf); 71 struct net *nfsd_file_put_local(struct nfsd_file __rcu **nf); 72 struct nfsd_file *nfsd_file_get(struct nfsd_file *nf); 73 struct file *nfsd_file_file(struct nfsd_file *nf); 74 void nfsd_file_close_inode_sync(struct inode *inode); 75 void nfsd_file_close_export(struct net *net, const struct path *path); 76 void nfsd_file_net_dispose(struct nfsd_net *nn); 77 bool nfsd_file_is_cached(struct inode *inode); 78 __be32 nfsd_file_acquire_gc(struct svc_rqst *rqstp, struct svc_fh *fhp, 79 unsigned int may_flags, struct nfsd_file **nfp); 80 __be32 nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp, 81 unsigned int may_flags, struct nfsd_file **nfp); 82 __be32 nfsd_file_acquire_opened(struct svc_rqst *rqstp, struct svc_fh *fhp, 83 unsigned int may_flags, struct file *file, 84 struct nfsd_file **nfp); 85 __be32 nfsd_file_acquire_local(struct net *net, struct svc_cred *cred, 86 struct auth_domain *client, struct svc_fh *fhp, 87 unsigned int may_flags, struct nfsd_file **pnf); 88 __be32 nfsd_file_acquire_dir(struct svc_rqst *rqstp, struct svc_fh *fhp, 89 struct nfsd_file **pnf); 90 int nfsd_file_cache_stats_show(struct seq_file *m, void *v); 91 void nfsd_fsnotify_recalc_mask(struct nfsd_file *nf); 92 #endif /* _FS_NFSD_FILECACHE_H */ 93