/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  linux/include/linux/nfs_fs.h
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  OS-specific nfs filesystem definitions and declarations
 */
#ifndef _LINUX_NFS_FS_H
#define _LINUX_NFS_FS_H

#include <uapi/linux/nfs_fs.h>


/*
 * Enable dprintk() debugging support for nfs client.
 */
#ifdef CONFIG_NFS_DEBUG
# define NFS_DEBUG
#endif

#include <linux/in.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/rbtree.h>
#include <linux/refcount.h>
#include <linux/rwsem.h>
#include <linux/wait.h>

#include <linux/sunrpc/debug.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/clnt.h>

#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
#include <linux/nfs_xdr.h>
#include <linux/nfs_fs_sb.h>

#include <linux/mempool.h>

/*
 * These are the default flags for swap requests
 */
#define NFS_RPC_SWAPFLAGS               (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)

/*
 * NFSv3/v4 Access mode cache entry
 */
struct nfs_access_entry {
        struct rb_node          rb_node;
        struct list_head        lru;
        const struct cred *     cred;
        __u32                   mask;
        struct rcu_head         rcu_head;
};

struct nfs_lock_context {
        refcount_t count;
        struct list_head list;
        struct nfs_open_context *open_context;
        fl_owner_t lockowner;
        atomic_t io_count;
        struct rcu_head rcu_head;
};

struct nfs4_state;
struct nfs_open_context {
        struct nfs_lock_context lock_context;
        fl_owner_t flock_owner;
        struct dentry *dentry;
        const struct cred *cred;
        struct rpc_cred *ll_cred;       /* low-level cred - use to check for expiry */
        struct nfs4_state *state;
        fmode_t mode;

        unsigned long flags;
#define NFS_CONTEXT_RESEND_WRITES       (1)
#define NFS_CONTEXT_BAD                 (2)
#define NFS_CONTEXT_UNLOCK      (3)
        int error;

        struct list_head list;
        struct nfs4_threshold   *mdsthreshold;
        struct rcu_head rcu_head;
};

struct nfs_open_dir_context {
        struct list_head list;
        const struct cred *cred;
        unsigned long attr_gencount;
        __u64 dir_cookie;
        __u64 dup_cookie;
        signed char duped;
};

/*
 * NFSv4 delegation
 */
struct nfs_delegation;

struct posix_acl;

/*
 * nfs fs inode data in memory
 */
struct nfs_inode {
        /*
         * The 64bit 'inode number'
         */
        __u64 fileid;

        /*
         * NFS file handle
         */
        struct nfs_fh           fh;

        /*
         * Various flags
         */
        unsigned long           flags;                  /* atomic bit ops */
        unsigned long           cache_validity;         /* bit mask */

        /*
         * read_cache_jiffies is when we started read-caching this inode.
         * attrtimeo is for how long the cached information is assumed
         * to be valid. A successful attribute revalidation doubles
         * attrtimeo (up to acregmax/acdirmax), a failure resets it to
         * acregmin/acdirmin.
         *
         * We need to revalidate the cached attrs for this inode if
         *
         *      jiffies - read_cache_jiffies >= attrtimeo
         *
         * Please note the comparison is greater than or equal
         * so that zero timeout values can be specified.
         */
        unsigned long           read_cache_jiffies;
        unsigned long           attrtimeo;
        unsigned long           attrtimeo_timestamp;

        unsigned long           attr_gencount;
        /* "Generation counter" for the attribute cache. This is
         * bumped whenever we update the metadata on the
         * server.
         */
        unsigned long           cache_change_attribute;

        struct rb_root          access_cache;
        struct list_head        access_cache_entry_lru;
        struct list_head        access_cache_inode_lru;

        /*
         * This is the cookie verifier used for NFSv3 readdir
         * operations
         */
        __be32                  cookieverf[2];

        atomic_long_t           nrequests;
        struct nfs_mds_commit_info commit_info;

        /* Open contexts for shared mmap writes */
        struct list_head        open_files;

        /* Readers: in-flight sillydelete RPC calls */
        /* Writers: rmdir */
        struct rw_semaphore     rmdir_sem;
        struct mutex            commit_mutex;

#if IS_ENABLED(CONFIG_NFS_V4)
        struct nfs4_cached_acl  *nfs4_acl;
        /* NFSv4 state */
        struct list_head        open_states;
        struct nfs_delegation __rcu *delegation;
        struct rw_semaphore     rwsem;

        /* pNFS layout information */
        struct pnfs_layout_hdr *layout;
#endif /* CONFIG_NFS_V4*/
        /* how many bytes have been written/read and how many bytes queued up */
        __u64 write_io;
        __u64 read_io;
#ifdef CONFIG_NFS_FSCACHE
        struct fscache_cookie   *fscache;
#endif
        struct inode            vfs_inode;
};

struct nfs4_copy_state {
        struct list_head        copies;
        nfs4_stateid            stateid;
        struct completion       completion;
        uint64_t                count;
        struct nfs_writeverf    verf;
        int                     error;
        int                     flags;
        struct nfs4_state       *parent_state;
};

/*
 * Access bit flags
 */
#define NFS_ACCESS_READ        0x0001
#define NFS_ACCESS_LOOKUP      0x0002
#define NFS_ACCESS_MODIFY      0x0004
#define NFS_ACCESS_EXTEND      0x0008
#define NFS_ACCESS_DELETE      0x0010
#define NFS_ACCESS_EXECUTE     0x0020

/*
 * Cache validity bit flags
 */
#define NFS_INO_INVALID_DATA    BIT(1)          /* cached data is invalid */
#define NFS_INO_INVALID_ATIME   BIT(2)          /* cached atime is invalid */
#define NFS_INO_INVALID_ACCESS  BIT(3)          /* cached access cred invalid */
#define NFS_INO_INVALID_ACL     BIT(4)          /* cached acls are invalid */
#define NFS_INO_REVAL_PAGECACHE BIT(5)          /* must revalidate pagecache */
#define NFS_INO_REVAL_FORCED    BIT(6)          /* force revalidation ignoring a delegation */
#define NFS_INO_INVALID_LABEL   BIT(7)          /* cached label is invalid */
#define NFS_INO_INVALID_CHANGE  BIT(8)          /* cached change is invalid */
#define NFS_INO_INVALID_CTIME   BIT(9)          /* cached ctime is invalid */
#define NFS_INO_INVALID_MTIME   BIT(10)         /* cached mtime is invalid */
#define NFS_INO_INVALID_SIZE    BIT(11)         /* cached size is invalid */
#define NFS_INO_INVALID_OTHER   BIT(12)         /* other attrs are invalid */
#define NFS_INO_DATA_INVAL_DEFER        \
                                BIT(13)         /* Deferred cache invalidation */

#define NFS_INO_INVALID_ATTR    (NFS_INO_INVALID_CHANGE \
                | NFS_INO_INVALID_CTIME \
                | NFS_INO_INVALID_MTIME \
                | NFS_INO_INVALID_SIZE \
                | NFS_INO_INVALID_OTHER)        /* inode metadata is invalid */

/*
 * Bit offsets in flags field
 */
#define NFS_INO_ADVISE_RDPLUS   (0)             /* advise readdirplus */
#define NFS_INO_STALE           (1)             /* possible stale inode */
#define NFS_INO_ACL_LRU_SET     (2)             /* Inode is on the LRU list */
#define NFS_INO_INVALIDATING    (3)             /* inode is being invalidated */
#define NFS_INO_FSCACHE         (5)             /* inode can be cached by FS-Cache */
#define NFS_INO_FSCACHE_LOCK    (6)             /* FS-Cache cookie management lock */
#define NFS_INO_LAYOUTCOMMIT    (9)             /* layoutcommit required */
#define NFS_INO_LAYOUTCOMMITTING (10)           /* layoutcommit inflight */
#define NFS_INO_LAYOUTSTATS     (11)            /* layoutstats inflight */
#define NFS_INO_ODIRECT         (12)            /* I/O setting is O_DIRECT */

static inline struct nfs_inode *NFS_I(const struct inode *inode)
{
        return container_of(inode, struct nfs_inode, vfs_inode);
}

static inline struct nfs_server *NFS_SB(const struct super_block *s)
{
        return (struct nfs_server *)(s->s_fs_info);
}

static inline struct nfs_fh *NFS_FH(const struct inode *inode)
{
        return &NFS_I(inode)->fh;
}

static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
{
        return NFS_SB(inode->i_sb);
}

static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
{
        return NFS_SERVER(inode)->client;
}

static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
{
        return NFS_SERVER(inode)->nfs_client->rpc_ops;
}

static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
{
        struct nfs_server *nfss = NFS_SERVER(inode);
        return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
}

static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
{
        struct nfs_server *nfss = NFS_SERVER(inode);
        return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
}

static inline int NFS_STALE(const struct inode *inode)
{
        return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
}

static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
{
#ifdef CONFIG_NFS_FSCACHE
        return NFS_I(inode)->fscache;
#else
        return NULL;
#endif
}

static inline __u64 NFS_FILEID(const struct inode *inode)
{
        return NFS_I(inode)->fileid;
}

static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
{
        NFS_I(inode)->fileid = fileid;
}

static inline void nfs_mark_for_revalidate(struct inode *inode)
{
        struct nfs_inode *nfsi = NFS_I(inode);

        spin_lock(&inode->i_lock);
        nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE
                | NFS_INO_INVALID_ACCESS
                | NFS_INO_INVALID_ACL
                | NFS_INO_INVALID_CHANGE
                | NFS_INO_INVALID_CTIME;
        if (S_ISDIR(inode->i_mode))
                nfsi->cache_validity |= NFS_INO_INVALID_DATA;
        spin_unlock(&inode->i_lock);
}

static inline int nfs_server_capable(struct inode *inode, int cap)
{
        return NFS_SERVER(inode)->caps & cap;
}

static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
{
        dentry->d_time = verf;
}

/**
 * nfs_save_change_attribute - Returns the inode attribute change cookie
 * @dir - pointer to parent directory inode
 * The "change attribute" is updated every time we finish an operation
 * that will result in a metadata change on the server.
 */
static inline unsigned long nfs_save_change_attribute(struct inode *dir)
{
        return NFS_I(dir)->cache_change_attribute;
}

/**
 * nfs_verify_change_attribute - Detects NFS remote directory changes
 * @dir - pointer to parent directory inode
 * @chattr - previously saved change attribute
 * Return "false" if the verifiers doesn't match the change attribute.
 * This would usually indicate that the directory contents have changed on
 * the server, and that any dentries need revalidating.
 */
static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
{
        return chattr == NFS_I(dir)->cache_change_attribute;
}

/*
 * linux/fs/nfs/inode.c
 */
extern int nfs_sync_mapping(struct address_space *mapping);
extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
extern void nfs_zap_caches(struct inode *);
extern void nfs_invalidate_atime(struct inode *);
extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
                                struct nfs_fattr *, struct nfs4_label *);
struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_getattr(const struct path *, struct kstat *, u32, unsigned int);
extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
extern int nfs_permission(struct inode *, int);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_attribute_cache_expired(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_revalidate_mapping_rcu(struct inode *inode);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
                                struct nfs4_label *label);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
extern void nfs_file_clear_open_context(struct file *flip);
extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
extern u64 nfs_compat_user_ino64(u64 fileid);
extern void nfs_fattr_init(struct nfs_fattr *fattr);
extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
extern unsigned long nfs_inc_attr_generation_counter(void);

extern struct nfs_fattr *nfs_alloc_fattr(void);

static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
{
        kfree(fattr);
}

extern struct nfs_fh *nfs_alloc_fhandle(void);

static inline void nfs_free_fhandle(const struct nfs_fh *fh)
{
        kfree(fh);
}

#ifdef NFS_DEBUG
extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
{
        return _nfs_display_fhandle_hash(fh);
}
extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
#define nfs_display_fhandle(fh, caption)                        \
        do {                                                    \
                if (unlikely(nfs_debug & NFSDBG_FACILITY))      \
                        _nfs_display_fhandle(fh, caption);      \
        } while (0)
#else
static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
{
        return 0;
}
static inline void nfs_display_fhandle(const struct nfs_fh *fh,
                                       const char *caption)
{
}
#endif

/*
 * linux/fs/nfs/nfsroot.c
 */
extern int  nfs_root_data(char **root_device, char **root_data); /*__init*/
/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern __be32 root_nfs_parse_addr(char *name); /*__init*/

/*
 * linux/fs/nfs/file.c
 */
extern const struct file_operations nfs_file_operations;
#if IS_ENABLED(CONFIG_NFS_V4)
extern const struct file_operations nfs4_file_operations;
#endif /* CONFIG_NFS_V4 */
extern const struct address_space_operations nfs_file_aops;
extern const struct address_space_operations nfs_dir_aops;

static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
{
        return filp->private_data;
}

static inline const struct cred *nfs_file_cred(struct file *file)
{
        if (file != NULL) {
                struct nfs_open_context *ctx =
                        nfs_file_open_context(file);
                if (ctx)
                        return ctx->cred;
        }
        return NULL;
}

/*
 * linux/fs/nfs/direct.c
 */
extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
                        struct iov_iter *iter);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
                        struct iov_iter *iter);

/*
 * linux/fs/nfs/dir.c
 */
extern const struct file_operations nfs_dir_operations;
extern const struct dentry_operations nfs_dentry_operations;

extern void nfs_force_lookup_revalidate(struct inode *dir);
extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
                        struct nfs_fattr *fattr, struct nfs4_label *label);
extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
extern void nfs_access_zap_cache(struct inode *inode);

/*
 * linux/fs/nfs/symlink.c
 */
extern const struct inode_operations nfs_symlink_inode_operations;

/*
 * linux/fs/nfs/sysctl.c
 */
#ifdef CONFIG_SYSCTL
extern int nfs_register_sysctl(void);
extern void nfs_unregister_sysctl(void);
#else
#define nfs_register_sysctl() 0
#define nfs_unregister_sysctl() do { } while(0)
#endif

/*
 * linux/fs/nfs/namespace.c
 */
extern const struct inode_operations nfs_mountpoint_inode_operations;
extern const struct inode_operations nfs_referral_inode_operations;
extern int nfs_mountpoint_expiry_timeout;
extern void nfs_release_automount_timer(void);

/*
 * linux/fs/nfs/unlink.c
 */
extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);

/*
 * linux/fs/nfs/write.c
 */
extern int  nfs_congestion_kb;
extern int  nfs_writepage(struct page *page, struct writeback_control *wbc);
extern int  nfs_writepages(struct address_space *, struct writeback_control *);
extern int  nfs_flush_incompatible(struct file *file, struct page *page);
extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);

/*
 * Try to write back everything synchronously (but check the
 * return value!)
 */
extern int nfs_sync_inode(struct inode *inode);
extern int nfs_wb_all(struct inode *inode);
extern int nfs_wb_page(struct inode *inode, struct page *page);
extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
extern int  nfs_commit_inode(struct inode *, int);
extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail);
extern void nfs_commit_free(struct nfs_commit_data *data);

static inline int
nfs_have_writebacks(struct inode *inode)
{
        return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
}

/*
 * 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_async(struct nfs_open_context *, struct inode *,
                               struct page *);

/*
 * inline functions
 */

static inline loff_t nfs_size_to_loff_t(__u64 size)
{
        return min_t(u64, size, OFFSET_MAX);
}

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;
}

#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)


# undef ifdebug
# ifdef NFS_DEBUG
#  define ifdebug(fac)          if (unlikely(nfs_debug & NFSDBG_##fac))
#  define NFS_IFDEBUG(x)        x
# else
#  define ifdebug(fac)          if (0)
#  define NFS_IFDEBUG(x)
# endif
#endif