drivers/staging/lustre/lustre/llite/llite_internal.h

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 */

#ifndef LLITE_INTERNAL_H
#define LLITE_INTERNAL_H
#include <lustre_debug.h>
#include <uapi/linux/lustre/lustre_ver.h>
#include <lustre_disk.h>	/* for s2sbi */
#include <lustre_linkea.h>

/* for struct cl_lock_descr and struct cl_io */
#include <lustre_patchless_compat.h>
#include <lustre_compat.h>
#include <cl_object.h>
#include <lustre_lmv.h>
#include <lustre_mdc.h>
#include <lustre_intent.h>
#include <linux/compat.h>
#include <linux/namei.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include "vvp_internal.h"
#include "range_lock.h"

#ifndef FMODE_EXEC
#define FMODE_EXEC 0
#endif

#ifndef VM_FAULT_RETRY
#define VM_FAULT_RETRY 0
#endif

/** Only used on client-side for indicating the tail of dir hash/offset. */
#define LL_DIR_END_OFF	  0x7fffffffffffffffULL
#define LL_DIR_END_OFF_32BIT    0x7fffffffUL

/* 4UL * 1024 * 1024 */
#define LL_MAX_BLKSIZE_BITS 22

#define LL_IT2STR(it) ((it) ? ldlm_it2str((it)->it_op) : "0")
#define LUSTRE_FPRIVATE(file) ((file)->private_data)

struct ll_dentry_data {
	struct lookup_intent		*lld_it;
	unsigned int			lld_sa_generation;
	unsigned int			lld_invalid:1;
	unsigned int			lld_nfs_dentry:1;
	struct rcu_head			lld_rcu_head;
};

#define ll_d2d(de) ((struct ll_dentry_data *)((de)->d_fsdata))

#define LLI_INODE_MAGIC		 0x111d0de5
#define LLI_INODE_DEAD		  0xdeadd00d

struct ll_getname_data {
	struct dir_context ctx;
	char	    *lgd_name;      /* points to a buffer with NAME_MAX+1 size */
	struct lu_fid    lgd_fid;       /* target fid we are looking for */
	int	      lgd_found;     /* inode matched? */
};

struct ll_grouplock {
	struct lu_env	*lg_env;
	struct cl_io	*lg_io;
	struct cl_lock	*lg_lock;
	unsigned long	 lg_gid;
};

enum ll_file_flags {
	/* File data is modified. */
	LLIF_DATA_MODIFIED	= 0,
	/* File is being restored */
	LLIF_FILE_RESTORING	= 1,
	/* Xattr cache is attached to the file */
	LLIF_XATTR_CACHE	= 2,
};

struct ll_inode_info {
	__u32				lli_inode_magic;

	spinlock_t			lli_lock;
	unsigned long			lli_flags;
	struct posix_acl		*lli_posix_acl;

	/* identifying fields for both metadata and data stacks. */
	struct lu_fid		   lli_fid;
	/* master inode fid for stripe directory */
	struct lu_fid		   lli_pfid;

	/* We need all three because every inode may be opened in different
	 * modes
	 */
	struct obd_client_handle       *lli_mds_read_och;
	struct obd_client_handle       *lli_mds_write_och;
	struct obd_client_handle       *lli_mds_exec_och;
	__u64			   lli_open_fd_read_count;
	__u64			   lli_open_fd_write_count;
	__u64			   lli_open_fd_exec_count;
	/* Protects access to och pointers and their usage counters */
	struct mutex			lli_och_mutex;

	struct inode			lli_vfs_inode;

	/* the most recent timestamps obtained from mds */
	s64				lli_atime;
	s64				lli_mtime;
	s64				lli_ctime;
	spinlock_t			lli_agl_lock;

	/* Try to make the d::member and f::member are aligned. Before using
	 * these members, make clear whether it is directory or not.
	 */
	union {
		/* for directory */
		struct {
			/* serialize normal readdir and statahead-readdir. */
			struct mutex			lli_readdir_mutex;

			/* metadata statahead */
			/* since parent-child threads can share the same @file
			 * struct, "opendir_key" is the token when dir close for
			 * case of parent exit before child -- it is me should
			 * cleanup the dir readahead.
			 */
			void			       *lli_opendir_key;
			struct ll_statahead_info       *lli_sai;
			/* protect statahead stuff. */
			spinlock_t			lli_sa_lock;
			/* "opendir_pid" is the token when lookup/revalidate
			 * -- I am the owner of dir statahead.
			 */
			pid_t				lli_opendir_pid;
			/* stat will try to access statahead entries or start
			 * statahead if this flag is set, and this flag will be
			 * set upon dir open, and cleared when dir is closed,
			 * statahead hit ratio is too low, or start statahead
			 * thread failed.
			 */
			unsigned int			lli_sa_enabled:1;
			/* generation for statahead */
			unsigned int			lli_sa_generation;
			/* directory stripe information */
			struct lmv_stripe_md	       *lli_lsm_md;
			/* default directory stripe offset.  This is extracted
			 * from the "dmv" xattr in order to decide which MDT to
			 * create a subdirectory on.  The MDS itself fetches
			 * "dmv" and gets the rest of the default layout itself
			 * (count, hash, etc).
			 */
			__u32				lli_def_stripe_offset;
		};

		/* for non-directory */
		struct {
			struct mutex			lli_size_mutex;
			char			       *lli_symlink_name;
			/*
			 * struct rw_semaphore {
			 *    signed long	count;     // align d.d_def_acl
			 *    spinlock_t	wait_lock; // align d.d_sa_lock
			 *    struct list_head wait_list;
			 * }
			 */
			struct rw_semaphore		lli_trunc_sem;
			struct range_lock_tree		lli_write_tree;

			struct rw_semaphore		lli_glimpse_sem;
			unsigned long			lli_glimpse_time;
			struct list_head		lli_agl_list;
			__u64				lli_agl_index;

			/* for writepage() only to communicate to fsync */
			int				lli_async_rc;

			/*
			 * whenever a process try to read/write the file, the
			 * jobid of the process will be saved here, and it'll
			 * be packed into the write PRC when flush later.
			 *
			 * so the read/write statistics for jobid will not be
			 * accurate if the file is shared by different jobs.
			 */
			char				lli_jobid[LUSTRE_JOBID_SIZE];
		};
	};

	/* XXX: For following frequent used members, although they maybe special
	 *      used for non-directory object, it is some time-wasting to check
	 *      whether the object is directory or not before using them. On the
	 *      other hand, currently, sizeof(f) > sizeof(d), it cannot reduce
	 *      the "ll_inode_info" size even if moving those members into u.f.
	 *      So keep them out side.
	 *
	 *      In the future, if more members are added only for directory,
	 *      some of the following members can be moved into u.f.
	 */
	struct cl_object	       *lli_clob;

	/* mutex to request for layout lock exclusively. */
	struct mutex			lli_layout_mutex;
	/* Layout version, protected by lli_layout_lock */
	__u32				lli_layout_gen;
	spinlock_t			lli_layout_lock;

	struct rw_semaphore		lli_xattrs_list_rwsem;
	struct mutex			lli_xattrs_enq_lock;
	struct list_head		lli_xattrs;/* ll_xattr_entry->xe_list */
};

static inline __u32 ll_layout_version_get(struct ll_inode_info *lli)
{
	__u32 gen;

	spin_lock(&lli->lli_layout_lock);
	gen = lli->lli_layout_gen;
	spin_unlock(&lli->lli_layout_lock);

	return gen;
}

static inline void ll_layout_version_set(struct ll_inode_info *lli, __u32 gen)
{
	spin_lock(&lli->lli_layout_lock);
	lli->lli_layout_gen = gen;
	spin_unlock(&lli->lli_layout_lock);
}

int ll_xattr_cache_destroy(struct inode *inode);

int ll_xattr_cache_get(struct inode *inode, const char *name,
		       char *buffer, size_t size, __u64 valid);

int ll_init_security(struct dentry *dentry, struct inode *inode,
		     struct inode *dir);

/*
 * Locking to guarantee consistency of non-atomic updates to long long i_size,
 * consistency between file size and KMS.
 *
 * Implemented by ->lli_size_mutex and ->lsm_lock, nested in that order.
 */

void ll_inode_size_lock(struct inode *inode);
void ll_inode_size_unlock(struct inode *inode);

/* FIXME: replace the name of this with LL_I to conform to kernel stuff */
/* static inline struct ll_inode_info *LL_I(struct inode *inode) */
static inline struct ll_inode_info *ll_i2info(struct inode *inode)
{
	return container_of(inode, struct ll_inode_info, lli_vfs_inode);
}

/* default to about 64M of readahead on a given system. */
#define SBI_DEFAULT_READAHEAD_MAX	(64UL << (20 - PAGE_SHIFT))

/* default to read-ahead full files smaller than 2MB on the second read */
#define SBI_DEFAULT_READAHEAD_WHOLE_MAX (2UL << (20 - PAGE_SHIFT))

enum ra_stat {
	RA_STAT_HIT = 0,
	RA_STAT_MISS,
	RA_STAT_DISTANT_READPAGE,
	RA_STAT_MISS_IN_WINDOW,
	RA_STAT_FAILED_GRAB_PAGE,
	RA_STAT_FAILED_MATCH,
	RA_STAT_DISCARDED,
	RA_STAT_ZERO_LEN,
	RA_STAT_ZERO_WINDOW,
	RA_STAT_EOF,
	RA_STAT_MAX_IN_FLIGHT,
	RA_STAT_WRONG_GRAB_PAGE,
	RA_STAT_FAILED_REACH_END,
	_NR_RA_STAT,
};

struct ll_ra_info {
	atomic_t	      ra_cur_pages;
	unsigned long	     ra_max_pages;
	unsigned long	     ra_max_pages_per_file;
	unsigned long	     ra_max_read_ahead_whole_pages;
};

/* ra_io_arg will be filled in the beginning of ll_readahead with
 * ras_lock, then the following ll_read_ahead_pages will read RA
 * pages according to this arg, all the items in this structure are
 * counted by page index.
 */
struct ra_io_arg {
	unsigned long ria_start;  /* start offset of read-ahead*/
	unsigned long ria_end;    /* end offset of read-ahead*/
	unsigned long ria_reserved; /* reserved pages for read-ahead */
	unsigned long ria_end_min;  /* minimum end to cover current read */
	bool ria_eof;		    /* reach end of file */
	/* If stride read pattern is detected, ria_stoff means where
	 * stride read is started. Note: for normal read-ahead, the
	 * value here is meaningless, and also it will not be accessed
	 */
	pgoff_t ria_stoff;
	/* ria_length and ria_pages are the length and pages length in the
	 * stride I/O mode. And they will also be used to check whether
	 * it is stride I/O read-ahead in the read-ahead pages
	 */
	unsigned long ria_length;
	unsigned long ria_pages;
};

/* LL_HIST_MAX=32 causes an overflow */
#define LL_HIST_MAX 28
#define LL_HIST_START 12 /* buckets start at 2^12 = 4k */
#define LL_PROCESS_HIST_MAX 10
struct per_process_info {
	pid_t pid;
	struct obd_histogram pp_r_hist;
	struct obd_histogram pp_w_hist;
};

/* pp_extents[LL_PROCESS_HIST_MAX] will hold the combined process info */
struct ll_rw_extents_info {
	struct per_process_info pp_extents[LL_PROCESS_HIST_MAX + 1];
};

#define LL_OFFSET_HIST_MAX 100
struct ll_rw_process_info {
	pid_t		     rw_pid;
	int		       rw_op;
	loff_t		    rw_range_start;
	loff_t		    rw_range_end;
	loff_t		    rw_last_file_pos;
	loff_t		    rw_offset;
	size_t		    rw_smallest_extent;
	size_t		    rw_largest_extent;
	struct ll_file_data      *rw_last_file;
};

enum stats_track_type {
	STATS_TRACK_ALL = 0,  /* track all processes */
	STATS_TRACK_PID,      /* track process with this pid */
	STATS_TRACK_PPID,     /* track processes with this ppid */
	STATS_TRACK_GID,      /* track processes with this gid */
	STATS_TRACK_LAST,
};

/* flags for sbi->ll_flags */
#define LL_SBI_NOLCK	     0x01 /* DLM locking disabled (directio-only) */
#define LL_SBI_CHECKSUM	  0x02 /* checksum each page as it's written */
#define LL_SBI_FLOCK	     0x04
#define LL_SBI_USER_XATTR	0x08 /* support user xattr */
#define LL_SBI_ACL	       0x10 /* support ACL */
/* LL_SBI_RMT_CLIENT		 0x40	 remote client */
#define LL_SBI_MDS_CAPA		 0x80 /* support mds capa, obsolete */
#define LL_SBI_OSS_CAPA		0x100 /* support oss capa, obsolete */
#define LL_SBI_LOCALFLOCK       0x200 /* Local flocks support by kernel */
#define LL_SBI_LRU_RESIZE       0x400 /* lru resize support */
#define LL_SBI_LAZYSTATFS       0x800 /* lazystatfs mount option */
/*	LL_SBI_SOM_PREVIEW     0x1000    SOM preview mount option, obsolete */
#define LL_SBI_32BIT_API       0x2000 /* generate 32 bit inodes. */
#define LL_SBI_64BIT_HASH      0x4000 /* support 64-bits dir hash/offset */
#define LL_SBI_AGL_ENABLED     0x8000 /* enable agl */
#define LL_SBI_VERBOSE	0x10000 /* verbose mount/umount */
#define LL_SBI_LAYOUT_LOCK    0x20000 /* layout lock support */
#define LL_SBI_USER_FID2PATH  0x40000 /* allow fid2path by unprivileged users */
#define LL_SBI_XATTR_CACHE    0x80000 /* support for xattr cache */
#define LL_SBI_NOROOTSQUASH	0x100000 /* do not apply root squash */
#define LL_SBI_ALWAYS_PING	0x200000 /* always ping even if server
					  * suppress_pings */

#define LL_SBI_FLAGS {	\
	"nolck",	\
	"checksum",	\
	"flock",	\
	"user_xattr",	\
	"acl",		\
	"???",		\
	"???",		\
	"mds_capa",	\
	"oss_capa",	\
	"flock",	\
	"lru_resize",	\
	"lazy_statfs",	\
	"som",		\
	"32bit_api",	\
	"64bit_hash",	\
	"agl",		\
	"verbose",	\
	"layout",	\
	"user_fid2path",\
	"xattr_cache",	\
	"norootsquash",	\
	"always_ping",	\
}

/*
 * This is embedded into llite super-blocks to keep track of connect
 * flags (capabilities) supported by all imports given mount is
 * connected to.
 */
struct lustre_client_ocd {
	/*
	 * This is conjunction of connect_flags across all imports
	 * (LOVs) this mount is connected to. This field is updated by
	 * cl_ocd_update() under ->lco_lock.
	 */
	__u64			 lco_flags;
	struct mutex		 lco_lock;
	struct obd_export	*lco_md_exp;
	struct obd_export	*lco_dt_exp;
};

struct ll_sb_info {
	/* this protects pglist and ra_info.  It isn't safe to
	 * grab from interrupt contexts
	 */
	spinlock_t		  ll_lock;
	spinlock_t		  ll_pp_extent_lock; /* pp_extent entry*/
	spinlock_t		  ll_process_lock; /* ll_rw_process_info */
	struct obd_uuid	   ll_sb_uuid;
	struct obd_export	*ll_md_exp;
	struct obd_export	*ll_dt_exp;
	struct dentry		*ll_debugfs_entry;
	struct lu_fid	     ll_root_fid; /* root object fid */

	int		       ll_flags;
	unsigned int		  ll_umounting:1,
				  ll_xattr_cache_enabled:1,
				  ll_client_common_fill_super_succeeded:1;

	struct lustre_client_ocd  ll_lco;

	struct lprocfs_stats     *ll_stats; /* lprocfs stats counter */

	/*
	 * Used to track "unstable" pages on a client, and maintain a
	 * LRU list of clean pages. An "unstable" page is defined as
	 * any page which is sent to a server as part of a bulk request,
	 * but is uncommitted to stable storage.
	 */
	struct cl_client_cache    *ll_cache;

	struct lprocfs_stats     *ll_ra_stats;

	struct ll_ra_info	 ll_ra_info;
	unsigned int	      ll_namelen;
	const struct file_operations	*ll_fop;

	unsigned int		  ll_md_brw_pages; /* readdir pages per RPC */

	struct lu_site	   *ll_site;
	struct cl_device	 *ll_cl;
	/* Statistics */
	struct ll_rw_extents_info ll_rw_extents_info;
	int		       ll_extent_process_count;
	struct ll_rw_process_info ll_rw_process_info[LL_PROCESS_HIST_MAX];
	unsigned int	      ll_offset_process_count;
	struct ll_rw_process_info ll_rw_offset_info[LL_OFFSET_HIST_MAX];
	unsigned int	      ll_rw_offset_entry_count;
	int		       ll_stats_track_id;
	enum stats_track_type     ll_stats_track_type;
	int		       ll_rw_stats_on;

	/* metadata stat-ahead */
	unsigned int	      ll_sa_max;     /* max statahead RPCs */
	atomic_t		  ll_sa_total;   /* statahead thread started
						  * count
						  */
	atomic_t		  ll_sa_wrong;   /* statahead thread stopped for
						  * low hit ratio
						  */
	atomic_t		ll_sa_running;	/* running statahead thread
						 * count
						 */
	atomic_t		  ll_agl_total;  /* AGL thread started count */

	dev_t			  ll_sdev_orig; /* save s_dev before assign for
						 * clustered nfs
						 */
	/* root squash */
	struct root_squash_info	  ll_squash;
	struct path		 ll_mnt;

	__kernel_fsid_t		  ll_fsid;
	struct kobject		 ll_kobj; /* sysfs object */
	struct super_block	*ll_sb; /* struct super_block (for sysfs code)*/
	struct completion	 ll_kobj_unregister;
};

/*
 * per file-descriptor read-ahead data.
 */
struct ll_readahead_state {
	spinlock_t  ras_lock;
	/*
	 * index of the last page that read(2) needed and that wasn't in the
	 * cache. Used by ras_update() to detect seeks.
	 *
	 * XXX nikita: if access seeks into cached region, Lustre doesn't see
	 * this.
	 */
	unsigned long   ras_last_readpage;
	/*
	 * number of pages read after last read-ahead window reset. As window
	 * is reset on each seek, this is effectively a number of consecutive
	 * accesses. Maybe ->ras_accessed_in_window is better name.
	 *
	 * XXX nikita: window is also reset (by ras_update()) when Lustre
	 * believes that memory pressure evicts read-ahead pages. In that
	 * case, it probably doesn't make sense to expand window to
	 * PTLRPC_MAX_BRW_PAGES on the third access.
	 */
	unsigned long   ras_consecutive_pages;
	/*
	 * number of read requests after the last read-ahead window reset
	 * As window is reset on each seek, this is effectively the number
	 * on consecutive read request and is used to trigger read-ahead.
	 */
	unsigned long   ras_consecutive_requests;
	/*
	 * Parameters of current read-ahead window. Handled by
	 * ras_update(). On the initial access to the file or after a seek,
	 * window is reset to 0. After 3 consecutive accesses, window is
	 * expanded to PTLRPC_MAX_BRW_PAGES. Afterwards, window is enlarged by
	 * PTLRPC_MAX_BRW_PAGES chunks up to ->ra_max_pages.
	 */
	unsigned long   ras_window_start, ras_window_len;
	/*
	 * Optimal RPC size. It decides how many pages will be sent
	 * for each read-ahead.
	 */
	unsigned long	ras_rpc_size;
	/*
	 * Where next read-ahead should start at. This lies within read-ahead
	 * window. Read-ahead window is read in pieces rather than at once
	 * because: 1. lustre limits total number of pages under read-ahead by
	 * ->ra_max_pages (see ll_ra_count_get()), 2. client cannot read pages
	 * not covered by DLM lock.
	 */
	unsigned long   ras_next_readahead;
	/*
	 * Total number of ll_file_read requests issued, reads originating
	 * due to mmap are not counted in this total.  This value is used to
	 * trigger full file read-ahead after multiple reads to a small file.
	 */
	unsigned long   ras_requests;
	/*
	 * Page index with respect to the current request, these value
	 * will not be accurate when dealing with reads issued via mmap.
	 */
	unsigned long   ras_request_index;
	/*
	 * The following 3 items are used for detecting the stride I/O
	 * mode.
	 * In stride I/O mode,
	 * ...............|-----data-----|****gap*****|--------|******|....
	 *    offset      |-stride_pages-|-stride_gap-|
	 * ras_stride_offset = offset;
	 * ras_stride_length = stride_pages + stride_gap;
	 * ras_stride_pages = stride_pages;
	 * Note: all these three items are counted by pages.
	 */
	unsigned long   ras_stride_length;
	unsigned long   ras_stride_pages;
	pgoff_t	 ras_stride_offset;
	/*
	 * number of consecutive stride request count, and it is similar as
	 * ras_consecutive_requests, but used for stride I/O mode.
	 * Note: only more than 2 consecutive stride request are detected,
	 * stride read-ahead will be enable
	 */
	unsigned long   ras_consecutive_stride_requests;
};

extern struct kmem_cache *ll_file_data_slab;
struct lustre_handle;
struct ll_file_data {
	struct ll_readahead_state fd_ras;
	struct ll_grouplock fd_grouplock;
	__u64 lfd_pos;
	__u32 fd_flags;
	fmode_t fd_omode;
	/* openhandle if lease exists for this file.
	 * Borrow lli->lli_och_mutex to protect assignment
	 */
	struct obd_client_handle *fd_lease_och;
	struct obd_client_handle *fd_och;
	struct file *fd_file;
	/* Indicate whether need to report failure when close.
	 * true: failure is known, not report again.
	 * false: unknown failure, should report.
	 */
	bool fd_write_failed;
	rwlock_t fd_lock; /* protect lcc list */
	struct list_head fd_lccs; /* list of ll_cl_context */
};

extern struct dentry *llite_root;
extern struct kset *llite_kset;

static inline struct inode *ll_info2i(struct ll_inode_info *lli)
{
	return &lli->lli_vfs_inode;
}

__u32 ll_i2suppgid(struct inode *i);
void ll_i2gids(__u32 *suppgids, struct inode *i1, struct inode *i2);

static inline int ll_need_32bit_api(struct ll_sb_info *sbi)
{
#if BITS_PER_LONG == 32
	return 1;
#elif defined(CONFIG_COMPAT)
	return unlikely(in_compat_syscall() || (sbi->ll_flags & LL_SBI_32BIT_API));
#else
	return unlikely(sbi->ll_flags & LL_SBI_32BIT_API);
#endif
}

void ll_ras_enter(struct file *f);

/* llite/lcommon_misc.c */
int cl_init_ea_size(struct obd_export *md_exp, struct obd_export *dt_exp);
int cl_ocd_update(struct obd_device *host,
		  struct obd_device *watched,
		  enum obd_notify_event ev, void *owner, void *data);
int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
		     struct ll_grouplock *cg);
void cl_put_grouplock(struct ll_grouplock *cg);

/* llite/lproc_llite.c */
int ldebugfs_register_mountpoint(struct dentry *parent,
				 struct super_block *sb, char *osc, char *mdc);
void ldebugfs_unregister_mountpoint(struct ll_sb_info *sbi);
void ll_stats_ops_tally(struct ll_sb_info *sbi, int op, int count);
void lprocfs_llite_init_vars(struct lprocfs_static_vars *lvars);
void ll_rw_stats_tally(struct ll_sb_info *sbi, pid_t pid,
		       struct ll_file_data *file, loff_t pos,
		       size_t count, int rw);

enum {
	LPROC_LL_DIRTY_HITS,
	LPROC_LL_DIRTY_MISSES,
	LPROC_LL_READ_BYTES,
	LPROC_LL_WRITE_BYTES,
	LPROC_LL_BRW_READ,
	LPROC_LL_BRW_WRITE,
	LPROC_LL_IOCTL,
	LPROC_LL_OPEN,
	LPROC_LL_RELEASE,
	LPROC_LL_MAP,
	LPROC_LL_LLSEEK,
	LPROC_LL_FSYNC,
	LPROC_LL_READDIR,
	LPROC_LL_SETATTR,
	LPROC_LL_TRUNC,
	LPROC_LL_FLOCK,
	LPROC_LL_GETATTR,
	LPROC_LL_CREATE,
	LPROC_LL_LINK,
	LPROC_LL_UNLINK,
	LPROC_LL_SYMLINK,
	LPROC_LL_MKDIR,
	LPROC_LL_RMDIR,
	LPROC_LL_MKNOD,
	LPROC_LL_RENAME,
	LPROC_LL_STAFS,
	LPROC_LL_ALLOC_INODE,
	LPROC_LL_SETXATTR,
	LPROC_LL_GETXATTR,
	LPROC_LL_GETXATTR_HITS,
	LPROC_LL_LISTXATTR,
	LPROC_LL_REMOVEXATTR,
	LPROC_LL_INODE_PERM,
	LPROC_LL_FILE_OPCODES
};

/* llite/dir.c */
extern const struct file_operations ll_dir_operations;
extern const struct inode_operations ll_dir_inode_operations;
int ll_dir_read(struct inode *inode, __u64 *ppos, struct md_op_data *op_data,
		struct dir_context *ctx);
int ll_get_mdt_idx(struct inode *inode);
int ll_get_mdt_idx_by_fid(struct ll_sb_info *sbi, const struct lu_fid *fid);
struct page *ll_get_dir_page(struct inode *dir, struct md_op_data *op_data,
			     __u64 offset);
void ll_release_page(struct inode *inode, struct page *page, bool remove);

/* llite/namei.c */
extern const struct inode_operations ll_special_inode_operations;

struct inode *ll_iget(struct super_block *sb, ino_t hash,
		      struct lustre_md *lic);
int ll_test_inode_by_fid(struct inode *inode, void *opaque);
int ll_md_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
		       void *data, int flag);
struct dentry *ll_splice_alias(struct inode *inode, struct dentry *de);
void ll_update_times(struct ptlrpc_request *request, struct inode *inode);

/* llite/rw.c */
int ll_writepage(struct page *page, struct writeback_control *wbc);
int ll_writepages(struct address_space *mapping, struct writeback_control *wbc);
int ll_readpage(struct file *file, struct page *page);
void ll_readahead_init(struct inode *inode, struct ll_readahead_state *ras);
int vvp_io_write_commit(const struct lu_env *env, struct cl_io *io);
struct ll_cl_context *ll_cl_find(struct file *file);
void ll_cl_add(struct file *file, const struct lu_env *env, struct cl_io *io);
void ll_cl_remove(struct file *file, const struct lu_env *env);

extern const struct address_space_operations ll_aops;

/* llite/file.c */
extern const struct file_operations ll_file_operations;
extern const struct file_operations ll_file_operations_flock;
extern const struct file_operations ll_file_operations_noflock;
extern const struct inode_operations ll_file_inode_operations;
int ll_have_md_lock(struct inode *inode, __u64 *bits,
		    enum ldlm_mode l_req_mode);
enum ldlm_mode ll_take_md_lock(struct inode *inode, __u64 bits,
			       struct lustre_handle *lockh, __u64 flags,
			       enum ldlm_mode mode);
int ll_file_open(struct inode *inode, struct file *file);
int ll_file_release(struct inode *inode, struct file *file);
int ll_release_openhandle(struct inode *inode, struct lookup_intent *it);
int ll_md_real_close(struct inode *inode, fmode_t fmode);
int ll_getattr(const struct path *path, struct kstat *stat,
	       u32 request_mask, unsigned int flags);
struct posix_acl *ll_get_acl(struct inode *inode, int type);
int ll_migrate(struct inode *parent, struct file *file, int mdtidx,
	       const char *name, int namelen);
int ll_get_fid_by_name(struct inode *parent, const char *name,
		       int namelen, struct lu_fid *fid, struct inode **inode);
int ll_inode_permission(struct inode *inode, int mask);

int ll_lov_setstripe_ea_info(struct inode *inode, struct dentry *dentry,
			     __u64 flags, struct lov_user_md *lum,
			     int lum_size);
int ll_lov_getstripe_ea_info(struct inode *inode, const char *filename,
			     struct lov_mds_md **lmm, int *lmm_size,
			     struct ptlrpc_request **request);
int ll_dir_setstripe(struct inode *inode, struct lov_user_md *lump,
		     int set_default);
int ll_dir_getstripe(struct inode *inode, void **lmmp, int *lmm_size,
		     struct ptlrpc_request **request, u64 valid);
int ll_fsync(struct file *file, loff_t start, loff_t end, int data);
int ll_merge_attr(const struct lu_env *env, struct inode *inode);
int ll_fid2path(struct inode *inode, void __user *arg);
int ll_data_version(struct inode *inode, __u64 *data_version, int flags);
int ll_hsm_release(struct inode *inode);
int ll_hsm_state_set(struct inode *inode, struct hsm_state_set *hss);

/* llite/dcache.c */

extern const struct dentry_operations ll_d_ops;
void ll_intent_drop_lock(struct lookup_intent *it);
void ll_intent_release(struct lookup_intent *it);
void ll_invalidate_aliases(struct inode *inode);
void ll_lookup_finish_locks(struct lookup_intent *it, struct inode *inode);
int ll_revalidate_it_finish(struct ptlrpc_request *request,
			    struct lookup_intent *it, struct inode *inode);

/* llite/llite_lib.c */
extern struct super_operations lustre_super_operations;

void ll_lli_init(struct ll_inode_info *lli);
int ll_fill_super(struct super_block *sb, struct vfsmount *mnt);
void ll_put_super(struct super_block *sb);
void ll_kill_super(struct super_block *sb);
struct inode *ll_inode_from_resource_lock(struct ldlm_lock *lock);
void ll_dir_clear_lsm_md(struct inode *inode);
void ll_clear_inode(struct inode *inode);
int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import);
int ll_setattr(struct dentry *de, struct iattr *attr);
int ll_statfs(struct dentry *de, struct kstatfs *sfs);
int ll_statfs_internal(struct super_block *sb, struct obd_statfs *osfs,
		       __u64 max_age, __u32 flags);
int ll_update_inode(struct inode *inode, struct lustre_md *md);
int ll_read_inode2(struct inode *inode, void *opaque);
void ll_delete_inode(struct inode *inode);
int ll_iocontrol(struct inode *inode, struct file *file,
		 unsigned int cmd, unsigned long arg);
int ll_flush_ctx(struct inode *inode);
void ll_umount_begin(struct super_block *sb);
int ll_remount_fs(struct super_block *sb, int *flags, char *data);
int ll_show_options(struct seq_file *seq, struct dentry *dentry);
void ll_dirty_page_discard_warn(struct page *page, int ioret);
int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
		  struct super_block *sb, struct lookup_intent *it);
int ll_obd_statfs(struct inode *inode, void __user *arg);
int ll_get_max_mdsize(struct ll_sb_info *sbi, int *max_mdsize);
int ll_get_default_mdsize(struct ll_sb_info *sbi, int *default_mdsize);
int ll_set_default_mdsize(struct ll_sb_info *sbi, int default_mdsize);
int ll_process_config(struct lustre_cfg *lcfg);

enum {
	LUSTRE_OPC_MKDIR	= 0,
	LUSTRE_OPC_SYMLINK	= 1,
	LUSTRE_OPC_MKNOD	= 2,
	LUSTRE_OPC_CREATE	= 3,
	LUSTRE_OPC_ANY		= 5,
};

struct md_op_data *ll_prep_md_op_data(struct md_op_data *op_data,
				      struct inode *i1, struct inode *i2,
				      const char *name, size_t namelen,
				      u32 mode, __u32 opc, void *data);
void ll_finish_md_op_data(struct md_op_data *op_data);
int ll_get_obd_name(struct inode *inode, unsigned int cmd, unsigned long arg);
char *ll_get_fsname(struct super_block *sb, char *buf, int buflen);
void ll_compute_rootsquash_state(struct ll_sb_info *sbi);
void ll_open_cleanup(struct super_block *sb, struct ptlrpc_request *open_req);
ssize_t ll_copy_user_md(const struct lov_user_md __user *md,
			struct lov_user_md **kbuf);

/* Compute expected user md size when passing in a md from user space */
static inline ssize_t ll_lov_user_md_size(const struct lov_user_md *lum)
{
	switch (lum->lmm_magic) {
	case LOV_USER_MAGIC_V1:
		return sizeof(struct lov_user_md_v1);
	case LOV_USER_MAGIC_V3:
		return sizeof(struct lov_user_md_v3);
	case LOV_USER_MAGIC_SPECIFIC:
		if (lum->lmm_stripe_count > LOV_MAX_STRIPE_COUNT)
			return -EINVAL;

		return lov_user_md_size(lum->lmm_stripe_count,
					LOV_USER_MAGIC_SPECIFIC);
	}
	return -EINVAL;
}

/* llite/llite_nfs.c */
extern const struct export_operations lustre_export_operations;
__u32 get_uuid2int(const char *name, int len);
void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid);
struct inode *search_inode_for_lustre(struct super_block *sb,
				      const struct lu_fid *fid);
int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid);

/* llite/symlink.c */
extern const struct inode_operations ll_fast_symlink_inode_operations;

/**
 * IO arguments for various VFS I/O interfaces.
 */
struct vvp_io_args {
	/** normal/splice */
	union {
		struct {
			struct kiocb      *via_iocb;
			struct iov_iter   *via_iter;
		} normal;
	} u;
};

struct ll_cl_context {
	struct list_head	 lcc_list;
	void	   *lcc_cookie;
	const struct lu_env	*lcc_env;
	struct cl_io   *lcc_io;
	struct cl_page *lcc_page;
};

struct ll_thread_info {
	struct vvp_io_args   lti_args;
	struct ra_io_arg     lti_ria;
	struct ll_cl_context lti_io_ctx;
};

extern struct lu_context_key ll_thread_key;
static inline struct ll_thread_info *ll_env_info(const struct lu_env *env)
{
	struct ll_thread_info *lti;

	lti = lu_context_key_get(&env->le_ctx, &ll_thread_key);
	LASSERT(lti);
	return lti;
}

static inline struct vvp_io_args *ll_env_args(const struct lu_env *env)
{
	return &ll_env_info(env)->lti_args;
}

/* llite/llite_mmap.c */

int ll_teardown_mmaps(struct address_space *mapping, __u64 first, __u64 last);
int ll_file_mmap(struct file *file, struct vm_area_struct *vma);
void policy_from_vma(union ldlm_policy_data *policy, struct vm_area_struct *vma,
		     unsigned long addr, size_t count);
struct vm_area_struct *our_vma(struct mm_struct *mm, unsigned long addr,
			       size_t count);

static inline void ll_invalidate_page(struct page *vmpage)
{
	struct address_space *mapping = vmpage->mapping;
	loff_t offset = vmpage->index << PAGE_SHIFT;

	LASSERT(PageLocked(vmpage));
	if (!mapping)
		return;

	/*
	 * truncate_complete_page() calls
	 * a_ops->invalidatepage()->cl_page_delete()->vvp_page_delete().
	 */
	ll_teardown_mmaps(mapping, offset, offset + PAGE_SIZE);
	truncate_complete_page(mapping, vmpage);
}

#define    ll_s2sbi(sb)	(s2lsi(sb)->lsi_llsbi)

/* don't need an addref as the sb_info should be holding one */
static inline struct obd_export *ll_s2dtexp(struct super_block *sb)
{
	return ll_s2sbi(sb)->ll_dt_exp;
}

/* don't need an addref as the sb_info should be holding one */
static inline struct obd_export *ll_s2mdexp(struct super_block *sb)
{
	return ll_s2sbi(sb)->ll_md_exp;
}

static inline struct client_obd *sbi2mdc(struct ll_sb_info *sbi)
{
	struct obd_device *obd = sbi->ll_md_exp->exp_obd;

	if (!obd)
		LBUG();
	return &obd->u.cli;
}

/* FIXME: replace the name of this with LL_SB to conform to kernel stuff */
static inline struct ll_sb_info *ll_i2sbi(struct inode *inode)
{
	return ll_s2sbi(inode->i_sb);
}

static inline struct obd_export *ll_i2dtexp(struct inode *inode)
{
	return ll_s2dtexp(inode->i_sb);
}

static inline struct obd_export *ll_i2mdexp(struct inode *inode)
{
	return ll_s2mdexp(inode->i_sb);
}

static inline struct lu_fid *ll_inode2fid(struct inode *inode)
{
	struct lu_fid *fid;

	LASSERT(inode);
	fid = &ll_i2info(inode)->lli_fid;

	return fid;
}

static inline loff_t ll_file_maxbytes(struct inode *inode)
{
	struct cl_object *obj = ll_i2info(inode)->lli_clob;

	if (!obj)
		return MAX_LFS_FILESIZE;

	return min_t(loff_t, cl_object_maxbytes(obj), MAX_LFS_FILESIZE);
}

/* llite/xattr.c */
extern const struct xattr_handler *ll_xattr_handlers[];

#define XATTR_USER_T		1
#define XATTR_TRUSTED_T		2
#define XATTR_SECURITY_T	3
#define XATTR_ACL_ACCESS_T	4
#define XATTR_ACL_DEFAULT_T	5
#define XATTR_LUSTRE_T		6
#define XATTR_OTHER_T		7

ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size);
int ll_xattr_list(struct inode *inode, const char *name, int type,
		  void *buffer, size_t size, __u64 valid);
const struct xattr_handler *get_xattr_type(const char *name);

/**
 * Common IO arguments for various VFS I/O interfaces.
 */
int cl_sb_init(struct super_block *sb);
int cl_sb_fini(struct super_block *sb);

enum ras_update_flags {
	LL_RAS_HIT  = 0x1,
	LL_RAS_MMAP = 0x2
};
void ll_ra_count_put(struct ll_sb_info *sbi, unsigned long len);
void ll_ra_stats_inc(struct inode *inode, enum ra_stat which);

/* statahead.c */
#define LL_SA_RPC_MIN	   2
#define LL_SA_RPC_DEF	   32
#define LL_SA_RPC_MAX	   8192

#define LL_SA_CACHE_BIT	 5
#define LL_SA_CACHE_SIZE	(1 << LL_SA_CACHE_BIT)
#define LL_SA_CACHE_MASK	(LL_SA_CACHE_SIZE - 1)

/* per inode struct, for dir only */
struct ll_statahead_info {
	struct dentry	   *sai_dentry;
	atomic_t	    sai_refcount;   /* when access this struct, hold
					     * refcount
					     */
	unsigned int	    sai_max;	/* max ahead of lookup */
	__u64		   sai_sent;       /* stat requests sent count */
	__u64		   sai_replied;    /* stat requests which received
					    * reply
					    */
	__u64		   sai_index;      /* index of statahead entry */
	__u64		   sai_index_wait; /* index of entry which is the
					    * caller is waiting for
					    */
	__u64		   sai_hit;	/* hit count */
	__u64		   sai_miss;       /* miss count:
					    * for "ls -al" case, it includes
					    * hidden dentry miss;
					    * for "ls -l" case, it does not
					    * include hidden dentry miss.
					    * "sai_miss_hidden" is used for
					    * the later case.
					    */
	unsigned int	    sai_consecutive_miss; /* consecutive miss */
	unsigned int	    sai_miss_hidden;/* "ls -al", but first dentry
					     * is not a hidden one
					     */
	unsigned int	    sai_skip_hidden;/* skipped hidden dentry count */
	unsigned int	    sai_ls_all:1,   /* "ls -al", do stat-ahead for
					     * hidden entries
					     */
				sai_agl_valid:1,/* AGL is valid for the dir */
				sai_in_readpage:1;/* statahead is in readdir() */
	wait_queue_head_t	sai_waitq;      /* stat-ahead wait queue */
	struct ptlrpc_thread    sai_thread;     /* stat-ahead thread */
	struct ptlrpc_thread    sai_agl_thread; /* AGL thread */
	struct list_head	sai_interim_entries; /* entries which got async
						      * stat reply, but not
						      * instantiated
						      */
	struct list_head	sai_entries;	/* completed entries */
	struct list_head	sai_agls;	/* AGLs to be sent */
	struct list_head	sai_cache[LL_SA_CACHE_SIZE];
	spinlock_t		sai_cache_lock[LL_SA_CACHE_SIZE];
	atomic_t		sai_cache_count; /* entry count in cache */
};

int ll_statahead(struct inode *dir, struct dentry **dentry, bool unplug);
void ll_authorize_statahead(struct inode *dir, void *key);
void ll_deauthorize_statahead(struct inode *dir, void *key);

blkcnt_t dirty_cnt(struct inode *inode);

int cl_glimpse_size0(struct inode *inode, int agl);
int cl_glimpse_lock(const struct lu_env *env, struct cl_io *io,
		    struct inode *inode, struct cl_object *clob, int agl);

static inline int cl_glimpse_size(struct inode *inode)
{
	return cl_glimpse_size0(inode, 0);
}

static inline int cl_agl(struct inode *inode)
{
	return cl_glimpse_size0(inode, 1);
}

static inline int ll_glimpse_size(struct inode *inode)
{
	struct ll_inode_info *lli = ll_i2info(inode);
	int rc;

	down_read(&lli->lli_glimpse_sem);
	rc = cl_glimpse_size(inode);
	lli->lli_glimpse_time = cfs_time_current();
	up_read(&lli->lli_glimpse_sem);
	return rc;
}

/*
 * dentry may statahead when statahead is enabled and current process has opened
 * parent directory, and this dentry hasn't accessed statahead cache before
 */
static inline bool
dentry_may_statahead(struct inode *dir, struct dentry *dentry)
{
	struct ll_inode_info  *lli;
	struct ll_dentry_data *ldd;

	if (ll_i2sbi(dir)->ll_sa_max == 0)
		return false;

	lli = ll_i2info(dir);

	/*
	 * statahead is not allowed for this dir, there may be three causes:
	 * 1. dir is not opened.
	 * 2. statahead hit ratio is too low.
	 * 3. previous stat started statahead thread failed.
	 */
	if (!lli->lli_sa_enabled)
		return false;

	/* not the same process, don't statahead */
	if (lli->lli_opendir_pid != current_pid())
		return false;

	/*
	 * When stating a dentry, kernel may trigger 'revalidate' or 'lookup'
	 * multiple times, eg. for 'getattr', 'getxattr' and etc.
	 * For patchless client, lookup intent is not accurate, which may
	 * misguide statahead. For example:
	 * The 'revalidate' call for 'getattr' and 'getxattr' of a dentry will
	 * have the same intent -- IT_GETATTR, while one dentry should access
	 * statahead cache once, otherwise statahead windows is messed up.
	 * The solution is as following:
	 * Assign 'lld_sa_generation' with 'lli_sa_generation' when a dentry
	 * IT_GETATTR for the first time, and subsequent IT_GETATTR will
	 * bypass interacting with statahead cache by checking
	 * 'lld_sa_generation == lli->lli_sa_generation'.
	 */
	ldd = ll_d2d(dentry);
	if (ldd->lld_sa_generation == lli->lli_sa_generation)
		return false;

	return true;
}

/* llite ioctl register support routine */
enum llioc_iter {
	LLIOC_CONT = 0,
	LLIOC_STOP
};

#define LLIOC_MAX_CMD	   256

/*
 * Rules to write a callback function:
 *
 * Parameters:
 *  @magic: Dynamic ioctl call routine will feed this value with the pointer
 *      returned to ll_iocontrol_register.  Callback functions should use this
 *      data to check the potential collasion of ioctl cmd. If collasion is
 *      found, callback function should return LLIOC_CONT.
 *  @rcp: The result of ioctl command.
 *
 *  Return values:
 *      If @magic matches the pointer returned by ll_iocontrol_data, the
 *      callback should return LLIOC_STOP; return LLIOC_STOP otherwise.
 */
typedef enum llioc_iter (*llioc_callback_t)(struct inode *inode,
		struct file *file, unsigned int cmd, unsigned long arg,
		void *magic, int *rcp);

/* export functions */
/* Register ioctl block dynamatically for a regular file.
 *
 * @cmd: the array of ioctl command set
 * @count: number of commands in the @cmd
 * @cb: callback function, it will be called if an ioctl command is found to
 *      belong to the command list @cmd.
 *
 * Return value:
 *      A magic pointer will be returned if success;
 *      otherwise, NULL will be returned.
 * */
void *ll_iocontrol_register(llioc_callback_t cb, int count, unsigned int *cmd);
void ll_iocontrol_unregister(void *magic);

int cl_sync_file_range(struct inode *inode, loff_t start, loff_t end,
		       enum cl_fsync_mode mode, int ignore_layout);

/** direct write pages */
struct ll_dio_pages {
	/** page array to be written. we don't support
	 * partial pages except the last one.
	 */
	struct page **ldp_pages;
	/* offset of each page */
	loff_t       *ldp_offsets;
	/** if ldp_offsets is NULL, it means a sequential
	 * pages to be written, then this is the file offset
	 * of the first page.
	 */
	loff_t	ldp_start_offset;
	/** how many bytes are to be written. */
	size_t	ldp_size;
	/** # of pages in the array. */
	int	   ldp_nr;
};

ssize_t ll_direct_rw_pages(const struct lu_env *env, struct cl_io *io,
			   int rw, struct inode *inode,
			   struct ll_dio_pages *pv);

static inline int ll_file_nolock(const struct file *file)
{
	struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
	struct inode *inode = file_inode(file);

	return ((fd->fd_flags & LL_FILE_IGNORE_LOCK) ||
		(ll_i2sbi(inode)->ll_flags & LL_SBI_NOLCK));
}

static inline void ll_set_lock_data(struct obd_export *exp, struct inode *inode,
				    struct lookup_intent *it, __u64 *bits)
{
	if (!it->it_lock_set) {
		struct lustre_handle handle;

		/* If this inode is a remote object, it will get two
		 * separate locks in different namespaces, Master MDT,
		 * where the name entry is, will grant LOOKUP lock,
		 * remote MDT, where the object is, will grant
		 * UPDATE|PERM lock. The inode will be attached to both
		 * LOOKUP and PERM locks, so revoking either locks will
		 * case the dcache being cleared
		 */
		if (it->it_remote_lock_mode) {
			handle.cookie = it->it_remote_lock_handle;
			CDEBUG(D_DLMTRACE, "setting l_data to inode " DFID "%p for remote lock %#llx\n",
			       PFID(ll_inode2fid(inode)), inode,
			       handle.cookie);
			md_set_lock_data(exp, &handle, inode, NULL);
		}

		handle.cookie = it->it_lock_handle;

		CDEBUG(D_DLMTRACE, "setting l_data to inode " DFID "%p for lock %#llx\n",
		       PFID(ll_inode2fid(inode)), inode, handle.cookie);

		md_set_lock_data(exp, &handle, inode, &it->it_lock_bits);
		it->it_lock_set = 1;
	}

	if (bits)
		*bits = it->it_lock_bits;
}

static inline int d_lustre_invalid(const struct dentry *dentry)
{
	return ll_d2d(dentry)->lld_invalid;
}

/*
 * Mark dentry INVALID, if dentry refcount is zero (this is normally case for
 * ll_md_blocking_ast), unhash this dentry, and let dcache to reclaim it later;
 * else dput() of the last refcount will unhash this dentry and kill it.
 */
static inline void d_lustre_invalidate(struct dentry *dentry, int nested)
{
	CDEBUG(D_DENTRY, "invalidate dentry %pd (%p) parent %p inode %p refc %d\n",
	       dentry, dentry,
	       dentry->d_parent, d_inode(dentry), d_count(dentry));

	spin_lock_nested(&dentry->d_lock,
			 nested ? DENTRY_D_LOCK_NESTED : DENTRY_D_LOCK_NORMAL);
	ll_d2d(dentry)->lld_invalid = 1;
	/*
	 * We should be careful about dentries created by d_obtain_alias().
	 * These dentries are not put in the dentry tree, instead they are
	 * linked to sb->s_anon through dentry->d_hash.
	 * shrink_dcache_for_umount() shrinks the tree and sb->s_anon list.
	 * If we unhashed such a dentry, unmount would not be able to find
	 * it and busy inodes would be reported.
	 */
	if (d_count(dentry) == 0 && !(dentry->d_flags & DCACHE_DISCONNECTED))
		__d_drop(dentry);
	spin_unlock(&dentry->d_lock);
}

static inline void d_lustre_revalidate(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	LASSERT(ll_d2d(dentry));
	ll_d2d(dentry)->lld_invalid = 0;
	spin_unlock(&dentry->d_lock);
}

int ll_layout_conf(struct inode *inode, const struct cl_object_conf *conf);
int ll_layout_refresh(struct inode *inode, __u32 *gen);
int ll_layout_restore(struct inode *inode, loff_t start, __u64 length);

int ll_xattr_init(void);
void ll_xattr_fini(void);

int ll_page_sync_io(const struct lu_env *env, struct cl_io *io,
		    struct cl_page *page, enum cl_req_type crt);

int ll_getparent(struct file *file, struct getparent __user *arg);

/* lcommon_cl.c */
int cl_setattr_ost(struct cl_object *obj, const struct iattr *attr,
		   unsigned int attr_flags);

extern struct lu_env *cl_inode_fini_env;
extern u16 cl_inode_fini_refcheck;

int cl_file_inode_init(struct inode *inode, struct lustre_md *md);
void cl_inode_fini(struct inode *inode);

__u64 cl_fid_build_ino(const struct lu_fid *fid, int api32);
__u32 cl_fid_build_gen(const struct lu_fid *fid);

#endif /* LLITE_INTERNAL_H */