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65294c1f JL |
1 | #ifndef _FS_NFSD_FILECACHE_H |
2 | #define _FS_NFSD_FILECACHE_H | |
3 | ||
4 | #include <linux/fsnotify_backend.h> | |
5 | ||
6 | /* | |
7 | * This is the fsnotify_mark container that nfsd attaches to the files that it | |
8 | * is holding open. Note that we have a separate refcount here aside from the | |
9 | * one in the fsnotify_mark. We only want a single fsnotify_mark attached to | |
10 | * the inode, and for each nfsd_file to hold a reference to it. | |
11 | * | |
12 | * The fsnotify_mark is itself refcounted, but that's not sufficient to tell us | |
13 | * how to put that reference. If there are still outstanding nfsd_files that | |
14 | * reference the mark, then we would want to call fsnotify_put_mark on it. | |
15 | * If there were not, then we'd need to call fsnotify_destroy_mark. Since we | |
16 | * can't really tell the difference, we use the nfm_mark to keep track of how | |
17 | * many nfsd_files hold references to the mark. When that counter goes to zero | |
18 | * then we know to call fsnotify_destroy_mark on it. | |
19 | */ | |
20 | struct nfsd_file_mark { | |
21 | struct fsnotify_mark nfm_mark; | |
689827cd | 22 | refcount_t nfm_ref; |
65294c1f JL |
23 | }; |
24 | ||
25 | /* | |
26 | * A representation of a file that has been opened by knfsd. These are hashed | |
27 | * in the hashtable by inode pointer value. Note that this object doesn't | |
28 | * hold a reference to the inode by itself, so the nf_inode pointer should | |
29 | * never be dereferenced, only used for comparison. | |
30 | */ | |
31 | struct nfsd_file { | |
c4c649ab CL |
32 | struct rhlist_head nf_rlist; |
33 | void *nf_inode; | |
65294c1f JL |
34 | struct file *nf_file; |
35 | const struct cred *nf_cred; | |
5e113224 | 36 | struct net *nf_net; |
65294c1f JL |
37 | #define NFSD_FILE_HASHED (0) |
38 | #define NFSD_FILE_PENDING (1) | |
23ba98de | 39 | #define NFSD_FILE_REFERENCED (2) |
4d1ea845 | 40 | #define NFSD_FILE_GC (3) |
65294c1f | 41 | unsigned long nf_flags; |
689827cd | 42 | refcount_t nf_ref; |
65294c1f | 43 | unsigned char nf_may; |
c4c649ab | 44 | |
65294c1f | 45 | struct nfsd_file_mark *nf_mark; |
c4c649ab CL |
46 | struct list_head nf_lru; |
47 | struct rcu_head nf_rcu; | |
904940e9 | 48 | ktime_t nf_birthtime; |
65294c1f JL |
49 | }; |
50 | ||
51 | int nfsd_file_cache_init(void); | |
5e113224 | 52 | void nfsd_file_cache_purge(struct net *); |
65294c1f | 53 | void nfsd_file_cache_shutdown(void); |
9542e6a6 TM |
54 | int nfsd_file_cache_start_net(struct net *net); |
55 | void nfsd_file_cache_shutdown_net(struct net *net); | |
65294c1f JL |
56 | void nfsd_file_put(struct nfsd_file *nf); |
57 | struct nfsd_file *nfsd_file_get(struct nfsd_file *nf); | |
58 | void nfsd_file_close_inode_sync(struct inode *inode); | |
59 | bool nfsd_file_is_cached(struct inode *inode); | |
4d1ea845 CL |
60 | __be32 nfsd_file_acquire_gc(struct svc_rqst *rqstp, struct svc_fh *fhp, |
61 | unsigned int may_flags, struct nfsd_file **nfp); | |
65294c1f JL |
62 | __be32 nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp, |
63 | unsigned int may_flags, struct nfsd_file **nfp); | |
0b3a551f JL |
64 | __be32 nfsd_file_acquire_opened(struct svc_rqst *rqstp, struct svc_fh *fhp, |
65 | unsigned int may_flags, struct file *file, | |
66 | struct nfsd_file **nfp); | |
1342f9dd | 67 | int nfsd_file_cache_stats_show(struct seq_file *m, void *v); |
65294c1f | 68 | #endif /* _FS_NFSD_FILECACHE_H */ |