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linux-sg2042/fs/xfs/xfs_inode.h

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/*
* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_INODE_H__
#define __XFS_INODE_H__
/*
* File incore extent information, present for each of data & attr forks.
*/
#define XFS_INLINE_EXTS 2
#define XFS_INLINE_DATA 32
typedef struct xfs_ifork {
int if_bytes; /* bytes in if_u1 */
int if_real_bytes; /* bytes allocated in if_u1 */
xfs_bmbt_block_t *if_broot; /* file's incore btree root */
short if_broot_bytes; /* bytes allocated for root */
unsigned char if_flags; /* per-fork flags */
unsigned char if_ext_max; /* max # of extent records */
xfs_extnum_t if_lastex; /* last if_extents used */
union {
xfs_bmbt_rec_t *if_extents; /* linear map file exts */
char *if_data; /* inline file data */
} if_u1;
union {
xfs_bmbt_rec_t if_inline_ext[XFS_INLINE_EXTS];
/* very small file extents */
char if_inline_data[XFS_INLINE_DATA];
/* very small file data */
xfs_dev_t if_rdev; /* dev number if special */
uuid_t if_uuid; /* mount point value */
} if_u2;
} xfs_ifork_t;
/*
* Flags for xfs_ichgtime().
*/
#define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */
#define XFS_ICHGTIME_ACC 0x2 /* data fork access timestamp */
#define XFS_ICHGTIME_CHG 0x4 /* inode field change timestamp */
/*
* Per-fork incore inode flags.
*/
#define XFS_IFINLINE 0x0001 /* Inline data is read in */
#define XFS_IFEXTENTS 0x0002 /* All extent pointers are read in */
#define XFS_IFBROOT 0x0004 /* i_broot points to the bmap b-tree root */
/*
* Flags for xfs_imap() and xfs_dilocate().
*/
#define XFS_IMAP_LOOKUP 0x1
/*
* Maximum number of extent pointers in if_u1.if_extents.
*/
#define XFS_MAX_INCORE_EXTENTS 32768
#ifdef __KERNEL__
struct bhv_desc;
struct cred;
struct ktrace;
struct vnode;
struct xfs_buf;
struct xfs_bmap_free;
struct xfs_bmbt_irec;
struct xfs_bmbt_block;
struct xfs_inode;
struct xfs_inode_log_item;
struct xfs_mount;
struct xfs_trans;
struct xfs_dquot;
#if defined(XFS_ILOCK_TRACE)
#define XFS_ILOCK_KTRACE_SIZE 32
extern ktrace_t *xfs_ilock_trace_buf;
extern void xfs_ilock_trace(struct xfs_inode *, int, unsigned int, inst_t *);
#else
#define xfs_ilock_trace(i,n,f,ra)
#endif
/*
* This structure is used to communicate which extents of a file
* were holes when a write started from xfs_write_file() to
* xfs_strat_read(). This is necessary so that we can know which
* blocks need to be zeroed when they are read in in xfs_strat_read()
* if they weren\'t allocated when the buffer given to xfs_strat_read()
* was mapped.
*
* We keep a list of these attached to the inode. The list is
* protected by the inode lock and the fact that the io lock is
* held exclusively by writers.
*/
typedef struct xfs_gap {
struct xfs_gap *xg_next;
xfs_fileoff_t xg_offset_fsb;
xfs_extlen_t xg_count_fsb;
} xfs_gap_t;
typedef struct dm_attrs_s {
__uint32_t da_dmevmask; /* DMIG event mask */
__uint16_t da_dmstate; /* DMIG state info */
__uint16_t da_pad; /* DMIG extra padding */
} dm_attrs_t;
typedef struct xfs_iocore {
void *io_obj; /* pointer to container
* inode or dcxvn structure */
struct xfs_mount *io_mount; /* fs mount struct ptr */
#ifdef DEBUG
mrlock_t *io_lock; /* inode IO lock */
mrlock_t *io_iolock; /* inode IO lock */
#endif
/* I/O state */
xfs_fsize_t io_new_size; /* sz when write completes */
/* Miscellaneous state. */
unsigned int io_flags; /* IO related flags */
/* DMAPI state */
dm_attrs_t io_dmattrs;
} xfs_iocore_t;
#define io_dmevmask io_dmattrs.da_dmevmask
#define io_dmstate io_dmattrs.da_dmstate
#define XFS_IO_INODE(io) ((xfs_inode_t *) ((io)->io_obj))
#define XFS_IO_DCXVN(io) ((dcxvn_t *) ((io)->io_obj))
/*
* Flags in the flags field
*/
#define XFS_IOCORE_RT 0x1
/*
* xfs_iocore prototypes
*/
extern void xfs_iocore_inode_init(struct xfs_inode *);
extern void xfs_iocore_inode_reinit(struct xfs_inode *);
/*
* This is the type used in the xfs inode hash table.
* An array of these is allocated for each mounted
* file system to hash the inodes for that file system.
*/
typedef struct xfs_ihash {
struct xfs_inode *ih_next;
rwlock_t ih_lock;
uint ih_version;
} xfs_ihash_t;
#define XFS_IHASH(mp,ino) ((mp)->m_ihash + (((uint)(ino)) % (mp)->m_ihsize))
/*
* This is the xfs inode cluster hash. This hash is used by xfs_iflush to
* find inodes that share a cluster and can be flushed to disk at the same
* time.
*/
typedef struct xfs_chashlist {
struct xfs_chashlist *chl_next;
struct xfs_inode *chl_ip;
xfs_daddr_t chl_blkno; /* starting block number of
* the cluster */
struct xfs_buf *chl_buf; /* the inode buffer */
} xfs_chashlist_t;
typedef struct xfs_chash {
xfs_chashlist_t *ch_list;
lock_t ch_lock;
} xfs_chash_t;
#define XFS_CHASH(mp,blk) ((mp)->m_chash + (((uint)blk) % (mp)->m_chsize))
/*
* This is the xfs in-core inode structure.
* Most of the on-disk inode is embedded in the i_d field.
*
* The extent pointers/inline file space, however, are managed
* separately. The memory for this information is pointed to by
* the if_u1 unions depending on the type of the data.
* This is used to linearize the array of extents for fast in-core
* access. This is used until the file's number of extents
* surpasses XFS_MAX_INCORE_EXTENTS, at which point all extent pointers
* are accessed through the buffer cache.
*
* Other state kept in the in-core inode is used for identification,
* locking, transactional updating, etc of the inode.
*
* Generally, we do not want to hold the i_rlock while holding the
* i_ilock. Hierarchy is i_iolock followed by i_rlock.
*
* xfs_iptr_t contains all the inode fields upto and including the
* i_mnext and i_mprev fields, it is used as a marker in the inode
* chain off the mount structure by xfs_sync calls.
*/
typedef struct {
struct xfs_ihash *ip_hash; /* pointer to hash header */
struct xfs_inode *ip_next; /* inode hash link forw */
struct xfs_inode *ip_mnext; /* next inode in mount list */
struct xfs_inode *ip_mprev; /* ptr to prev inode */
struct xfs_inode **ip_prevp; /* ptr to prev i_next */
struct xfs_mount *ip_mount; /* fs mount struct ptr */
} xfs_iptr_t;
typedef struct xfs_inode {
/* Inode linking and identification information. */
struct xfs_ihash *i_hash; /* pointer to hash header */
struct xfs_inode *i_next; /* inode hash link forw */
struct xfs_inode *i_mnext; /* next inode in mount list */
struct xfs_inode *i_mprev; /* ptr to prev inode */
struct xfs_inode **i_prevp; /* ptr to prev i_next */
struct xfs_mount *i_mount; /* fs mount struct ptr */
struct list_head i_reclaim; /* reclaim list */
struct bhv_desc i_bhv_desc; /* inode behavior descriptor*/
struct xfs_dquot *i_udquot; /* user dquot */
struct xfs_dquot *i_gdquot; /* group dquot */
/* Inode location stuff */
xfs_ino_t i_ino; /* inode number (agno/agino)*/
xfs_daddr_t i_blkno; /* blkno of inode buffer */
ushort i_len; /* len of inode buffer */
ushort i_boffset; /* off of inode in buffer */
/* Extent information. */
xfs_ifork_t *i_afp; /* attribute fork pointer */
xfs_ifork_t i_df; /* data fork */
/* Transaction and locking information. */
struct xfs_trans *i_transp; /* ptr to owning transaction*/
struct xfs_inode_log_item *i_itemp; /* logging information */
mrlock_t i_lock; /* inode lock */
mrlock_t i_iolock; /* inode IO lock */
sema_t i_flock; /* inode flush lock */
atomic_t i_pincount; /* inode pin count */
wait_queue_head_t i_ipin_wait; /* inode pinning wait queue */
#ifdef HAVE_REFCACHE
struct xfs_inode **i_refcache; /* ptr to entry in ref cache */
struct xfs_inode *i_release; /* inode to unref */
#endif
/* I/O state */
xfs_iocore_t i_iocore; /* I/O core */
/* Miscellaneous state. */
unsigned short i_flags; /* see defined flags below */
unsigned char i_update_core; /* timestamps/size is dirty */
unsigned char i_update_size; /* di_size field is dirty */
unsigned int i_gen; /* generation count */
unsigned int i_delayed_blks; /* count of delay alloc blks */
xfs_dinode_core_t i_d; /* most of ondisk inode */
xfs_chashlist_t *i_chash; /* cluster hash list header */
struct xfs_inode *i_cnext; /* cluster hash link forward */
struct xfs_inode *i_cprev; /* cluster hash link backward */
/* Trace buffers per inode. */
#ifdef XFS_BMAP_TRACE
struct ktrace *i_xtrace; /* inode extent list trace */
#endif
#ifdef XFS_BMBT_TRACE
struct ktrace *i_btrace; /* inode bmap btree trace */
#endif
#ifdef XFS_RW_TRACE
struct ktrace *i_rwtrace; /* inode read/write trace */
#endif
#ifdef XFS_ILOCK_TRACE
struct ktrace *i_lock_trace; /* inode lock/unlock trace */
#endif
#ifdef XFS_DIR2_TRACE
struct ktrace *i_dir_trace; /* inode directory trace */
#endif
} xfs_inode_t;
#endif /* __KERNEL__ */
/*
* Fork handling.
*/
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_PTR)
xfs_ifork_t *xfs_ifork_ptr(xfs_inode_t *ip, int w);
#define XFS_IFORK_PTR(ip,w) xfs_ifork_ptr(ip,w)
#else
#define XFS_IFORK_PTR(ip,w) ((w) == XFS_DATA_FORK ? &(ip)->i_df : (ip)->i_afp)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_Q)
int xfs_ifork_q(xfs_inode_t *ip);
#define XFS_IFORK_Q(ip) xfs_ifork_q(ip)
#else
#define XFS_IFORK_Q(ip) XFS_CFORK_Q(&(ip)->i_d)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_DSIZE)
int xfs_ifork_dsize(xfs_inode_t *ip);
#define XFS_IFORK_DSIZE(ip) xfs_ifork_dsize(ip)
#else
#define XFS_IFORK_DSIZE(ip) XFS_CFORK_DSIZE(&ip->i_d, ip->i_mount)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_ASIZE)
int xfs_ifork_asize(xfs_inode_t *ip);
#define XFS_IFORK_ASIZE(ip) xfs_ifork_asize(ip)
#else
#define XFS_IFORK_ASIZE(ip) XFS_CFORK_ASIZE(&ip->i_d, ip->i_mount)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_SIZE)
int xfs_ifork_size(xfs_inode_t *ip, int w);
#define XFS_IFORK_SIZE(ip,w) xfs_ifork_size(ip,w)
#else
#define XFS_IFORK_SIZE(ip,w) XFS_CFORK_SIZE(&ip->i_d, ip->i_mount, w)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_FORMAT)
int xfs_ifork_format(xfs_inode_t *ip, int w);
#define XFS_IFORK_FORMAT(ip,w) xfs_ifork_format(ip,w)
#else
#define XFS_IFORK_FORMAT(ip,w) XFS_CFORK_FORMAT(&ip->i_d, w)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_FMT_SET)
void xfs_ifork_fmt_set(xfs_inode_t *ip, int w, int n);
#define XFS_IFORK_FMT_SET(ip,w,n) xfs_ifork_fmt_set(ip,w,n)
#else
#define XFS_IFORK_FMT_SET(ip,w,n) XFS_CFORK_FMT_SET(&ip->i_d, w, n)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_NEXTENTS)
int xfs_ifork_nextents(xfs_inode_t *ip, int w);
#define XFS_IFORK_NEXTENTS(ip,w) xfs_ifork_nextents(ip,w)
#else
#define XFS_IFORK_NEXTENTS(ip,w) XFS_CFORK_NEXTENTS(&ip->i_d, w)
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_IFORK_NEXT_SET)
void xfs_ifork_next_set(xfs_inode_t *ip, int w, int n);
#define XFS_IFORK_NEXT_SET(ip,w,n) xfs_ifork_next_set(ip,w,n)
#else
#define XFS_IFORK_NEXT_SET(ip,w,n) XFS_CFORK_NEXT_SET(&ip->i_d, w, n)
#endif
#ifdef __KERNEL__
/*
* In-core inode flags.
*/
#define XFS_IGRIO 0x0001 /* inode used for guaranteed rate i/o */
#define XFS_IUIOSZ 0x0002 /* inode i/o sizes have been explicitly set */
#define XFS_IQUIESCE 0x0004 /* we have started quiescing for this inode */
#define XFS_IRECLAIM 0x0008 /* we have started reclaiming this inode */
#define XFS_ISTALE 0x0010 /* inode has been staled */
#define XFS_IRECLAIMABLE 0x0020 /* inode can be reclaimed */
#define XFS_INEW 0x0040
/*
* Flags for inode locking.
*/
#define XFS_IOLOCK_EXCL 0x001
#define XFS_IOLOCK_SHARED 0x002
#define XFS_ILOCK_EXCL 0x004
#define XFS_ILOCK_SHARED 0x008
#define XFS_IUNLOCK_NONOTIFY 0x010
#define XFS_EXTENT_TOKEN_RD 0x040
#define XFS_SIZE_TOKEN_RD 0x080
#define XFS_EXTSIZE_RD (XFS_EXTENT_TOKEN_RD|XFS_SIZE_TOKEN_RD)
#define XFS_WILLLEND 0x100 /* Always acquire tokens for lending */
#define XFS_EXTENT_TOKEN_WR (XFS_EXTENT_TOKEN_RD | XFS_WILLLEND)
#define XFS_SIZE_TOKEN_WR (XFS_SIZE_TOKEN_RD | XFS_WILLLEND)
#define XFS_EXTSIZE_WR (XFS_EXTSIZE_RD | XFS_WILLLEND)
#define XFS_LOCK_MASK \
(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL | \
XFS_ILOCK_SHARED | XFS_EXTENT_TOKEN_RD | XFS_SIZE_TOKEN_RD | \
XFS_WILLLEND)
/*
* Flags for xfs_iflush()
*/
#define XFS_IFLUSH_DELWRI_ELSE_SYNC 1
#define XFS_IFLUSH_DELWRI_ELSE_ASYNC 2
#define XFS_IFLUSH_SYNC 3
#define XFS_IFLUSH_ASYNC 4
#define XFS_IFLUSH_DELWRI 5
/*
* Flags for xfs_itruncate_start().
*/
#define XFS_ITRUNC_DEFINITE 0x1
#define XFS_ITRUNC_MAYBE 0x2
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ITOV)
struct vnode *xfs_itov(xfs_inode_t *ip);
#define XFS_ITOV(ip) xfs_itov(ip)
#else
#define XFS_ITOV(ip) BHV_TO_VNODE(XFS_ITOBHV(ip))
#endif
#define XFS_ITOV_NULL(ip) BHV_TO_VNODE_NULL(XFS_ITOBHV(ip))
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_ITOBHV)
struct bhv_desc *xfs_itobhv(xfs_inode_t *ip);
#define XFS_ITOBHV(ip) xfs_itobhv(ip)
#else
#define XFS_ITOBHV(ip) ((struct bhv_desc *)(&((ip)->i_bhv_desc)))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_BHVTOI)
xfs_inode_t *xfs_bhvtoi(struct bhv_desc *bhvp);
#define XFS_BHVTOI(bhvp) xfs_bhvtoi(bhvp)
#else
#define XFS_BHVTOI(bhvp) \
((xfs_inode_t *)((char *)(bhvp) - \
(char *)&(((xfs_inode_t *)0)->i_bhv_desc)))
#endif
#define BHV_IS_XFS(bdp) (BHV_OPS(bdp) == &xfs_vnodeops)
/*
* For multiple groups support: if S_ISGID bit is set in the parent
* directory, group of new file is set to that of the parent, and
* new subdirectory gets S_ISGID bit from parent.
*/
#define XFS_INHERIT_GID(pip, vfsp) \
(((vfsp)->vfs_flag & VFS_GRPID) || ((pip)->i_d.di_mode & S_ISGID))
/*
* xfs_iget.c prototypes.
*/
#define IGET_CREATE 1
void xfs_ihash_init(struct xfs_mount *);
void xfs_ihash_free(struct xfs_mount *);
void xfs_chash_init(struct xfs_mount *);
void xfs_chash_free(struct xfs_mount *);
xfs_inode_t *xfs_inode_incore(struct xfs_mount *, xfs_ino_t,
struct xfs_trans *);
void xfs_inode_lock_init(xfs_inode_t *, struct vnode *);
int xfs_iget(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
uint, uint, xfs_inode_t **, xfs_daddr_t);
void xfs_iput(xfs_inode_t *, uint);
void xfs_iput_new(xfs_inode_t *, uint);
void xfs_ilock(xfs_inode_t *, uint);
int xfs_ilock_nowait(xfs_inode_t *, uint);
void xfs_iunlock(xfs_inode_t *, uint);
void xfs_ilock_demote(xfs_inode_t *, uint);
void xfs_iflock(xfs_inode_t *);
int xfs_iflock_nowait(xfs_inode_t *);
uint xfs_ilock_map_shared(xfs_inode_t *);
void xfs_iunlock_map_shared(xfs_inode_t *, uint);
void xfs_ifunlock(xfs_inode_t *);
void xfs_ireclaim(xfs_inode_t *);
int xfs_finish_reclaim(xfs_inode_t *, int, int);
int xfs_finish_reclaim_all(struct xfs_mount *, int);
/*
* xfs_inode.c prototypes.
*/
int xfs_itobp(struct xfs_mount *, struct xfs_trans *,
xfs_inode_t *, xfs_dinode_t **, struct xfs_buf **,
xfs_daddr_t);
int xfs_iread(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
xfs_inode_t **, xfs_daddr_t);
int xfs_iread_extents(struct xfs_trans *, xfs_inode_t *, int);
int xfs_ialloc(struct xfs_trans *, xfs_inode_t *, mode_t,
xfs_nlink_t, xfs_dev_t, struct cred *, xfs_prid_t,
int, struct xfs_buf **, boolean_t *, xfs_inode_t **);
void xfs_xlate_dinode_core(xfs_caddr_t, struct xfs_dinode_core *,
int);
uint xfs_ip2xflags(struct xfs_inode *);
uint xfs_dic2xflags(struct xfs_dinode_core *);
int xfs_ifree(struct xfs_trans *, xfs_inode_t *,
struct xfs_bmap_free *);
void xfs_itruncate_start(xfs_inode_t *, uint, xfs_fsize_t);
int xfs_itruncate_finish(struct xfs_trans **, xfs_inode_t *,
xfs_fsize_t, int, int);
int xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
int xfs_igrow_start(xfs_inode_t *, xfs_fsize_t, struct cred *);
void xfs_igrow_finish(struct xfs_trans *, xfs_inode_t *,
xfs_fsize_t, int);
void xfs_idestroy_fork(xfs_inode_t *, int);
void xfs_idestroy(xfs_inode_t *);
void xfs_idata_realloc(xfs_inode_t *, int, int);
void xfs_iextract(xfs_inode_t *);
void xfs_iext_realloc(xfs_inode_t *, int, int);
void xfs_iroot_realloc(xfs_inode_t *, int, int);
void xfs_ipin(xfs_inode_t *);
void xfs_iunpin(xfs_inode_t *);
int xfs_iextents_copy(xfs_inode_t *, xfs_bmbt_rec_t *, int);
int xfs_iflush(xfs_inode_t *, uint);
void xfs_iflush_all(struct xfs_mount *);
int xfs_iaccess(xfs_inode_t *, mode_t, cred_t *);
uint xfs_iroundup(uint);
void xfs_ichgtime(xfs_inode_t *, int);
xfs_fsize_t xfs_file_last_byte(xfs_inode_t *);
void xfs_lock_inodes(xfs_inode_t **, int, int, uint);
#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
#ifdef DEBUG
void xfs_isize_check(struct xfs_mount *, xfs_inode_t *, xfs_fsize_t);
#else /* DEBUG */
#define xfs_isize_check(mp, ip, isize)
#endif /* DEBUG */
#if defined(DEBUG)
void xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
#else
#define xfs_inobp_check(mp, bp)
#endif /* DEBUG */
extern struct kmem_zone *xfs_chashlist_zone;
extern struct kmem_zone *xfs_ifork_zone;
extern struct kmem_zone *xfs_inode_zone;
extern struct kmem_zone *xfs_ili_zone;
extern struct vnodeops xfs_vnodeops;
#endif /* __KERNEL__ */
#endif /* __XFS_INODE_H__ */
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