607 lines
16 KiB
C
607 lines
16 KiB
C
/*
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* linux/include/linux/nfs_fs.h
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* OS-specific nfs filesystem definitions and declarations
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*/
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#ifndef _LINUX_NFS_FS_H
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#define _LINUX_NFS_FS_H
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#include <linux/magic.h>
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/* Default timeout values */
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#define NFS_DEF_UDP_TIMEO (11)
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#define NFS_DEF_UDP_RETRANS (3)
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#define NFS_DEF_TCP_TIMEO (600)
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#define NFS_DEF_TCP_RETRANS (2)
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#define NFS_MAX_UDP_TIMEOUT (60*HZ)
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#define NFS_MAX_TCP_TIMEOUT (600*HZ)
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#define NFS_DEF_ACREGMIN (3)
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#define NFS_DEF_ACREGMAX (60)
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#define NFS_DEF_ACDIRMIN (30)
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#define NFS_DEF_ACDIRMAX (60)
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/*
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* When flushing a cluster of dirty pages, there can be different
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* strategies:
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*/
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#define FLUSH_SYNC 1 /* file being synced, or contention */
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#define FLUSH_STABLE 4 /* commit to stable storage */
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#define FLUSH_LOWPRI 8 /* low priority background flush */
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#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
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#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
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#define FLUSH_INVALIDATE 64 /* Invalidate the page cache */
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#define FLUSH_NOWRITEPAGE 128 /* Don't call writepage() */
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#ifdef __KERNEL__
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#include <linux/in.h>
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#include <linux/kref.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/rbtree.h>
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#include <linux/rwsem.h>
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#include <linux/wait.h>
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#include <linux/sunrpc/debug.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs2.h>
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#include <linux/nfs3.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_xdr.h>
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#include <linux/nfs_fs_sb.h>
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#include <linux/mempool.h>
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/*
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* These are the default flags for swap requests
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*/
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#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
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/*
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* NFSv3/v4 Access mode cache entry
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*/
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struct nfs_access_entry {
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struct rb_node rb_node;
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struct list_head lru;
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unsigned long jiffies;
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struct rpc_cred * cred;
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int mask;
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};
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struct nfs4_state;
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struct nfs_open_context {
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atomic_t count;
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struct path path;
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struct rpc_cred *cred;
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struct nfs4_state *state;
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fl_owner_t lockowner;
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fmode_t mode;
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unsigned long flags;
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#define NFS_CONTEXT_ERROR_WRITE (0)
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int error;
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struct list_head list;
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__u64 dir_cookie;
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};
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/*
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* NFSv4 delegation
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*/
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struct nfs_delegation;
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struct posix_acl;
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/*
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* nfs fs inode data in memory
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*/
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struct nfs_inode {
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/*
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* The 64bit 'inode number'
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*/
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__u64 fileid;
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/*
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* NFS file handle
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*/
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struct nfs_fh fh;
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/*
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* Various flags
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*/
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unsigned long flags; /* atomic bit ops */
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unsigned long cache_validity; /* bit mask */
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/*
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* read_cache_jiffies is when we started read-caching this inode.
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* attrtimeo is for how long the cached information is assumed
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* to be valid. A successful attribute revalidation doubles
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* attrtimeo (up to acregmax/acdirmax), a failure resets it to
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* acregmin/acdirmin.
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*
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* We need to revalidate the cached attrs for this inode if
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*
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* jiffies - read_cache_jiffies >= attrtimeo
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*
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* Please note the comparison is greater than or equal
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* so that zero timeout values can be specified.
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*/
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unsigned long read_cache_jiffies;
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unsigned long attrtimeo;
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unsigned long attrtimeo_timestamp;
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__u64 change_attr; /* v4 only */
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unsigned long attr_gencount;
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/* "Generation counter" for the attribute cache. This is
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* bumped whenever we update the metadata on the
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* server.
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*/
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unsigned long cache_change_attribute;
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struct rb_root access_cache;
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struct list_head access_cache_entry_lru;
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struct list_head access_cache_inode_lru;
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#ifdef CONFIG_NFS_V3_ACL
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struct posix_acl *acl_access;
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struct posix_acl *acl_default;
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#endif
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/*
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* This is the cookie verifier used for NFSv3 readdir
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* operations
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*/
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__be32 cookieverf[2];
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/*
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* This is the list of dirty unwritten pages.
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*/
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struct radix_tree_root nfs_page_tree;
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unsigned long ncommit,
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npages;
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/* Open contexts for shared mmap writes */
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struct list_head open_files;
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/* Number of in-flight sillydelete RPC calls */
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atomic_t silly_count;
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/* List of deferred sillydelete requests */
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struct hlist_head silly_list;
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wait_queue_head_t waitqueue;
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#ifdef CONFIG_NFS_V4
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struct nfs4_cached_acl *nfs4_acl;
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/* NFSv4 state */
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struct list_head open_states;
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struct nfs_delegation *delegation;
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fmode_t delegation_state;
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struct rw_semaphore rwsem;
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#endif /* CONFIG_NFS_V4*/
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struct inode vfs_inode;
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};
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/*
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* Cache validity bit flags
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*/
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#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
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#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
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#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
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#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
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#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
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#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
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#define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
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/*
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* Bit offsets in flags field
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*/
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#define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
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#define NFS_INO_STALE (1) /* possible stale inode */
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#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
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#define NFS_INO_MOUNTPOINT (3) /* inode is remote mountpoint */
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static inline struct nfs_inode *NFS_I(const struct inode *inode)
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{
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return container_of(inode, struct nfs_inode, vfs_inode);
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}
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static inline struct nfs_server *NFS_SB(const struct super_block *s)
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{
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return (struct nfs_server *)(s->s_fs_info);
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}
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static inline struct nfs_fh *NFS_FH(const struct inode *inode)
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{
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return &NFS_I(inode)->fh;
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}
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static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
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{
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return NFS_SB(inode->i_sb);
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}
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static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
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{
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return NFS_SERVER(inode)->client;
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}
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static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
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{
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return NFS_SERVER(inode)->nfs_client->rpc_ops;
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}
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static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
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{
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return NFS_I(inode)->cookieverf;
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}
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static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
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{
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struct nfs_server *nfss = NFS_SERVER(inode);
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return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
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}
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static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
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{
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struct nfs_server *nfss = NFS_SERVER(inode);
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return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
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}
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static inline int NFS_STALE(const struct inode *inode)
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{
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return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
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}
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static inline __u64 NFS_FILEID(const struct inode *inode)
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{
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return NFS_I(inode)->fileid;
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}
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static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
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{
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NFS_I(inode)->fileid = fileid;
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}
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static inline void nfs_mark_for_revalidate(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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spin_lock(&inode->i_lock);
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nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
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if (S_ISDIR(inode->i_mode))
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nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
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spin_unlock(&inode->i_lock);
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}
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static inline int nfs_server_capable(struct inode *inode, int cap)
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{
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return NFS_SERVER(inode)->caps & cap;
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}
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static inline int NFS_USE_READDIRPLUS(struct inode *inode)
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{
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return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
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}
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static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
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{
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dentry->d_time = verf;
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}
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/**
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* nfs_save_change_attribute - Returns the inode attribute change cookie
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* @dir - pointer to parent directory inode
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* The "change attribute" is updated every time we finish an operation
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* that will result in a metadata change on the server.
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*/
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static inline unsigned long nfs_save_change_attribute(struct inode *dir)
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{
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return NFS_I(dir)->cache_change_attribute;
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}
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/**
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* nfs_verify_change_attribute - Detects NFS remote directory changes
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* @dir - pointer to parent directory inode
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* @chattr - previously saved change attribute
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* Return "false" if the verifiers doesn't match the change attribute.
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* This would usually indicate that the directory contents have changed on
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* the server, and that any dentries need revalidating.
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*/
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static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
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{
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return chattr == NFS_I(dir)->cache_change_attribute;
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}
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/*
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* linux/fs/nfs/inode.c
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*/
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extern int nfs_sync_mapping(struct address_space *mapping);
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extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
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extern void nfs_zap_caches(struct inode *);
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extern void nfs_invalidate_atime(struct inode *);
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extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
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struct nfs_fattr *);
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extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
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extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
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extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
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extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
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extern int nfs_permission(struct inode *, int);
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extern int nfs_open(struct inode *, struct file *);
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extern int nfs_release(struct inode *, struct file *);
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extern int nfs_attribute_timeout(struct inode *inode);
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extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
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extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
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extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
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extern int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping);
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extern int nfs_setattr(struct dentry *, struct iattr *);
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extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
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extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
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extern void put_nfs_open_context(struct nfs_open_context *ctx);
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extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
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extern u64 nfs_compat_user_ino64(u64 fileid);
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extern void nfs_fattr_init(struct nfs_fattr *fattr);
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/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
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extern __be32 root_nfs_parse_addr(char *name); /*__init*/
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extern unsigned long nfs_inc_attr_generation_counter(void);
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/*
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* linux/fs/nfs/file.c
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*/
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extern const struct inode_operations nfs_file_inode_operations;
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#ifdef CONFIG_NFS_V3
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extern const struct inode_operations nfs3_file_inode_operations;
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#endif /* CONFIG_NFS_V3 */
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extern const struct file_operations nfs_file_operations;
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extern const struct address_space_operations nfs_file_aops;
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static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
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{
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return filp->private_data;
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}
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static inline struct rpc_cred *nfs_file_cred(struct file *file)
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{
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if (file != NULL) {
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struct nfs_open_context *ctx =
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nfs_file_open_context(file);
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if (ctx)
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return ctx->cred;
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}
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return NULL;
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}
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/*
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* linux/fs/nfs/xattr.c
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*/
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#ifdef CONFIG_NFS_V3_ACL
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extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
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extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
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extern int nfs3_setxattr(struct dentry *, const char *,
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const void *, size_t, int);
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extern int nfs3_removexattr (struct dentry *, const char *name);
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#else
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# define nfs3_listxattr NULL
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# define nfs3_getxattr NULL
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# define nfs3_setxattr NULL
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# define nfs3_removexattr NULL
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#endif
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/*
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* linux/fs/nfs/direct.c
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*/
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extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
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unsigned long);
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extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
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const struct iovec *iov, unsigned long nr_segs,
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loff_t pos);
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extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
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const struct iovec *iov, unsigned long nr_segs,
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loff_t pos);
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/*
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* linux/fs/nfs/dir.c
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*/
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extern const struct inode_operations nfs_dir_inode_operations;
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#ifdef CONFIG_NFS_V3
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extern const struct inode_operations nfs3_dir_inode_operations;
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#endif /* CONFIG_NFS_V3 */
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extern const struct file_operations nfs_dir_operations;
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extern struct dentry_operations nfs_dentry_operations;
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extern void nfs_force_lookup_revalidate(struct inode *dir);
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extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
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extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
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extern void nfs_access_zap_cache(struct inode *inode);
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/*
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* linux/fs/nfs/symlink.c
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*/
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extern const struct inode_operations nfs_symlink_inode_operations;
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/*
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* linux/fs/nfs/sysctl.c
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*/
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#ifdef CONFIG_SYSCTL
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extern int nfs_register_sysctl(void);
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extern void nfs_unregister_sysctl(void);
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#else
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#define nfs_register_sysctl() 0
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#define nfs_unregister_sysctl() do { } while(0)
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#endif
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/*
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* linux/fs/nfs/namespace.c
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*/
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extern const struct inode_operations nfs_mountpoint_inode_operations;
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extern const struct inode_operations nfs_referral_inode_operations;
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extern int nfs_mountpoint_expiry_timeout;
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extern void nfs_release_automount_timer(void);
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/*
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* linux/fs/nfs/unlink.c
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*/
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extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry);
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extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
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extern void nfs_block_sillyrename(struct dentry *dentry);
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extern void nfs_unblock_sillyrename(struct dentry *dentry);
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/*
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* linux/fs/nfs/write.c
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*/
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extern int nfs_congestion_kb;
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extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
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extern int nfs_writepages(struct address_space *, struct writeback_control *);
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extern int nfs_flush_incompatible(struct file *file, struct page *page);
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extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
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extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
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extern void nfs_writedata_release(void *);
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/*
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* Try to write back everything synchronously (but check the
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* return value!)
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*/
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extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
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extern int nfs_wb_all(struct inode *inode);
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extern int nfs_wb_nocommit(struct inode *inode);
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extern int nfs_wb_page(struct inode *inode, struct page* page);
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extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
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#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
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extern int nfs_commit_inode(struct inode *, int);
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extern struct nfs_write_data *nfs_commitdata_alloc(void);
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extern void nfs_commit_free(struct nfs_write_data *wdata);
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extern void nfs_commitdata_release(void *wdata);
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#else
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static inline int
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nfs_commit_inode(struct inode *inode, int how)
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{
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return 0;
|
|
}
|
|
#endif
|
|
|
|
static inline int
|
|
nfs_have_writebacks(struct inode *inode)
|
|
{
|
|
return NFS_I(inode)->npages != 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate nfs_write_data structures
|
|
*/
|
|
extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
|
|
|
|
/*
|
|
* linux/fs/nfs/read.c
|
|
*/
|
|
extern int nfs_readpage(struct file *, struct page *);
|
|
extern int nfs_readpages(struct file *, struct address_space *,
|
|
struct list_head *, unsigned);
|
|
extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
|
|
extern void nfs_readdata_release(void *data);
|
|
|
|
/*
|
|
* Allocate nfs_read_data structures
|
|
*/
|
|
extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
|
|
|
|
/*
|
|
* linux/fs/nfs3proc.c
|
|
*/
|
|
#ifdef CONFIG_NFS_V3_ACL
|
|
extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
|
|
extern int nfs3_proc_setacl(struct inode *inode, int type,
|
|
struct posix_acl *acl);
|
|
extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
|
|
mode_t mode);
|
|
extern void nfs3_forget_cached_acls(struct inode *inode);
|
|
#else
|
|
static inline int nfs3_proc_set_default_acl(struct inode *dir,
|
|
struct inode *inode,
|
|
mode_t mode)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void nfs3_forget_cached_acls(struct inode *inode)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NFS_V3_ACL */
|
|
|
|
/*
|
|
* inline functions
|
|
*/
|
|
|
|
static inline loff_t nfs_size_to_loff_t(__u64 size)
|
|
{
|
|
if (size > (__u64) OFFSET_MAX - 1)
|
|
return OFFSET_MAX - 1;
|
|
return (loff_t) size;
|
|
}
|
|
|
|
static inline ino_t
|
|
nfs_fileid_to_ino_t(u64 fileid)
|
|
{
|
|
ino_t ino = (ino_t) fileid;
|
|
if (sizeof(ino_t) < sizeof(u64))
|
|
ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
|
|
return ino;
|
|
}
|
|
|
|
/* NFS root */
|
|
|
|
extern void * nfs_root_data(void);
|
|
|
|
#define nfs_wait_event(clnt, wq, condition) \
|
|
({ \
|
|
int __retval = wait_event_killable(wq, condition); \
|
|
__retval; \
|
|
})
|
|
|
|
#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
/*
|
|
* NFS debug flags
|
|
*/
|
|
#define NFSDBG_VFS 0x0001
|
|
#define NFSDBG_DIRCACHE 0x0002
|
|
#define NFSDBG_LOOKUPCACHE 0x0004
|
|
#define NFSDBG_PAGECACHE 0x0008
|
|
#define NFSDBG_PROC 0x0010
|
|
#define NFSDBG_XDR 0x0020
|
|
#define NFSDBG_FILE 0x0040
|
|
#define NFSDBG_ROOT 0x0080
|
|
#define NFSDBG_CALLBACK 0x0100
|
|
#define NFSDBG_CLIENT 0x0200
|
|
#define NFSDBG_MOUNT 0x0400
|
|
#define NFSDBG_ALL 0xFFFF
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/*
|
|
* Enable debugging support for nfs client.
|
|
* Requires RPC_DEBUG.
|
|
*/
|
|
#ifdef RPC_DEBUG
|
|
# define NFS_DEBUG
|
|
#endif
|
|
|
|
# undef ifdebug
|
|
# ifdef NFS_DEBUG
|
|
# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
|
|
# else
|
|
# define ifdebug(fac) if (0)
|
|
# endif
|
|
#endif /* __KERNEL */
|
|
|
|
#endif
|