LXR linux-bk/fs/xfs/linux-2.6/xfs

   1/*
   2 * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3 *
   4 * This program is free software; you can redistribute it and/or modify it
   5 * under the terms of version 2 of the GNU General Public License as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it would be useful, but
   9 * WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11 *
  12 * Further, this software is distributed without any warranty that it is
  13 * free of the rightful claim of any third person regarding infringement
  14 * or the like.  Any license provided herein, whether implied or
  15 * otherwise, applies only to this software file.  Patent licenses, if
  16 * any, provided herein do not apply to combinations of this program with
  17 * other software, or any other product whatsoever.
  18 *
  19 * You should have received a copy of the GNU General Public License along
  20 * with this program; if not, write the Free Software Foundation, Inc., 59
  21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22 *
  23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24 * Mountain View, CA  94043, or:
  25 *
  26 * http://www.sgi.com
  27 *
  28 * For further information regarding this notice, see:
  29 *
  30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31 */
  32#ifndef __XFS_VFS_H__
  33#define __XFS_VFS_H__
  34
  35#include <linux/vfs.h>
  36#include "xfs_fs.h"
  37
  38struct fid;
  39struct vfs;
  40struct cred;
  41struct vnode;
  42struct kstatfs;
  43struct seq_file;
  44struct super_block;
  45struct xfs_mount_args;
  46
  47typedef struct kstatfs xfs_statfs_t;
  48
  49typedef struct vfs_sync_work {
  50        struct list_head        w_list;
  51        struct vfs              *w_vfs;
  52        void                    *w_data;        /* syncer routine argument */
  53        void                    (*w_syncer)(struct vfs *, void *);
  54} vfs_sync_work_t;
  55
  56typedef struct vfs {
  57        u_int                   vfs_flag;       /* flags */
  58        xfs_fsid_t              vfs_fsid;       /* file system ID */
  59        xfs_fsid_t              *vfs_altfsid;   /* An ID fixed for life of FS */
  60        bhv_head_t              vfs_bh;         /* head of vfs behavior chain */
  61        struct super_block      *vfs_super;     /* generic superblock pointer */
  62        struct task_struct      *vfs_sync_task; /* generalised sync thread */
  63        vfs_sync_work_t         vfs_sync_work;  /* work item for VFS_SYNC */
  64        struct list_head        vfs_sync_list;  /* sync thread work item list */
  65        spinlock_t              vfs_sync_lock;  /* work item list lock */
  66        int                     vfs_sync_seq;   /* sync thread generation no. */
  67        wait_queue_head_t       vfs_wait_single_sync_task;
  68        wait_queue_head_t       vfs_wait_sync_task;
  69} vfs_t;
  70
  71#define vfs_fbhv                vfs_bh.bh_first /* 1st on vfs behavior chain */
  72
  73#define bhvtovfs(bdp)           ( (struct vfs *)BHV_VOBJ(bdp) )
  74#define bhvtovfsops(bdp)        ( (struct vfsops *)BHV_OPS(bdp) )
  75#define VFS_BHVHEAD(vfs)        ( &(vfs)->vfs_bh )
  76#define VFS_REMOVEBHV(vfs, bdp) ( bhv_remove(VFS_BHVHEAD(vfs), bdp) )
  77
  78#define VFS_POSITION_BASE       BHV_POSITION_BASE       /* chain bottom */
  79#define VFS_POSITION_TOP        BHV_POSITION_TOP        /* chain top */
  80#define VFS_POSITION_INVALID    BHV_POSITION_INVALID    /* invalid pos. num */
  81
  82typedef enum {
  83        VFS_BHV_UNKNOWN,        /* not specified */
  84        VFS_BHV_XFS,            /* xfs */
  85        VFS_BHV_DM,             /* data migration */
  86        VFS_BHV_QM,             /* quota manager */
  87        VFS_BHV_IO,             /* IO path */
  88        VFS_BHV_END             /* housekeeping end-of-range */
  89} vfs_bhv_t;
  90
  91#define VFS_POSITION_XFS        (BHV_POSITION_BASE)
  92#define VFS_POSITION_DM         (VFS_POSITION_BASE+10)
  93#define VFS_POSITION_QM         (VFS_POSITION_BASE+20)
  94#define VFS_POSITION_IO         (VFS_POSITION_BASE+30)
  95
  96#define VFS_RDONLY              0x0001  /* read-only vfs */
  97#define VFS_GRPID               0x0002  /* group-ID assigned from directory */
  98#define VFS_DMI                 0x0004  /* filesystem has the DMI enabled */
  99#define VFS_UMOUNT              0x0008  /* unmount in progress */
 100#define VFS_END                 0x0008  /* max flag */
 101
 102#define SYNC_ATTR               0x0001  /* sync attributes */
 103#define SYNC_CLOSE              0x0002  /* close file system down */
 104#define SYNC_DELWRI             0x0004  /* look at delayed writes */
 105#define SYNC_WAIT               0x0008  /* wait for i/o to complete */
 106#define SYNC_BDFLUSH            0x0010  /* BDFLUSH is calling -- don't block */
 107#define SYNC_FSDATA             0x0020  /* flush fs data (e.g. superblocks) */
 108#define SYNC_REFCACHE           0x0040  /* prune some of the nfs ref cache */
 109#define SYNC_REMOUNT            0x0080  /* remount readonly, no dummy LRs */
 110
 111typedef int     (*vfs_mount_t)(bhv_desc_t *,
 112                                struct xfs_mount_args *, struct cred *);
 113typedef int     (*vfs_parseargs_t)(bhv_desc_t *, char *,
 114                                struct xfs_mount_args *, int);
 115typedef int     (*vfs_showargs_t)(bhv_desc_t *, struct seq_file *);
 116typedef int     (*vfs_unmount_t)(bhv_desc_t *, int, struct cred *);
 117typedef int     (*vfs_mntupdate_t)(bhv_desc_t *, int *,
 118                                struct xfs_mount_args *);
 119typedef int     (*vfs_root_t)(bhv_desc_t *, struct vnode **);
 120typedef int     (*vfs_statvfs_t)(bhv_desc_t *, xfs_statfs_t *, struct vnode *);
 121typedef int     (*vfs_sync_t)(bhv_desc_t *, int, struct cred *);
 122typedef int     (*vfs_vget_t)(bhv_desc_t *, struct vnode **, struct fid *);
 123typedef int     (*vfs_dmapiops_t)(bhv_desc_t *, caddr_t);
 124typedef int     (*vfs_quotactl_t)(bhv_desc_t *, int, int, caddr_t);
 125typedef void    (*vfs_init_vnode_t)(bhv_desc_t *,
 126                                struct vnode *, bhv_desc_t *, int);
 127typedef void    (*vfs_force_shutdown_t)(bhv_desc_t *, int, char *, int);
 128typedef void    (*vfs_freeze_t)(bhv_desc_t *);
 129
 130typedef struct vfsops {
 131        bhv_position_t          vf_position;    /* behavior chain position */
 132        vfs_mount_t             vfs_mount;      /* mount file system */
 133        vfs_parseargs_t         vfs_parseargs;  /* parse mount options */
 134        vfs_showargs_t          vfs_showargs;   /* unparse mount options */
 135        vfs_unmount_t           vfs_unmount;    /* unmount file system */
 136        vfs_mntupdate_t         vfs_mntupdate;  /* update file system options */
 137        vfs_root_t              vfs_root;       /* get root vnode */
 138        vfs_statvfs_t           vfs_statvfs;    /* file system statistics */
 139        vfs_sync_t              vfs_sync;       /* flush files */
 140        vfs_vget_t              vfs_vget;       /* get vnode from fid */
 141        vfs_dmapiops_t          vfs_dmapiops;   /* data migration */
 142        vfs_quotactl_t          vfs_quotactl;   /* disk quota */
 143        vfs_init_vnode_t        vfs_init_vnode; /* initialize a new vnode */
 144        vfs_force_shutdown_t    vfs_force_shutdown;     /* crash and burn */
 145        vfs_freeze_t            vfs_freeze;     /* freeze fs for snapshot */
 146} vfsops_t;
 147
 148/*
 149 * VFS's.  Operates on vfs structure pointers (starts at bhv head).
 150 */
 151#define VHEAD(v)                        ((v)->vfs_fbhv)
 152#define VFS_MOUNT(v, ma,cr, rv)         ((rv) = vfs_mount(VHEAD(v), ma,cr))
 153#define VFS_PARSEARGS(v, o,ma,f, rv)    ((rv) = vfs_parseargs(VHEAD(v), o,ma,f))
 154#define VFS_SHOWARGS(v, m, rv)          ((rv) = vfs_showargs(VHEAD(v), m))
 155#define VFS_UNMOUNT(v, f, cr, rv)       ((rv) = vfs_unmount(VHEAD(v), f,cr))
 156#define VFS_MNTUPDATE(v, fl, args, rv)  ((rv) = vfs_mntupdate(VHEAD(v), fl, args))
 157#define VFS_ROOT(v, vpp, rv)            ((rv) = vfs_root(VHEAD(v), vpp))
 158#define VFS_STATVFS(v, sp,vp, rv)       ((rv) = vfs_statvfs(VHEAD(v), sp,vp))
 159#define VFS_SYNC(v, flag,cr, rv)        ((rv) = vfs_sync(VHEAD(v), flag,cr))
 160#define VFS_VGET(v, vpp,fidp, rv)       ((rv) = vfs_vget(VHEAD(v), vpp,fidp))
 161#define VFS_DMAPIOPS(v, p, rv)          ((rv) = vfs_dmapiops(VHEAD(v), p))
 162#define VFS_QUOTACTL(v, c,id,p, rv)     ((rv) = vfs_quotactl(VHEAD(v), c,id,p))
 163#define VFS_INIT_VNODE(v, vp,b,ul)      ( vfs_init_vnode(VHEAD(v), vp,b,ul) )
 164#define VFS_FORCE_SHUTDOWN(v, fl,f,l)   ( vfs_force_shutdown(VHEAD(v), fl,f,l) )
 165#define VFS_FREEZE(v)                   ( vfs_freeze(VHEAD(v)) )
 166
 167/*
 168 * PVFS's.  Operates on behavior descriptor pointers.
 169 */
 170#define PVFS_MOUNT(b, ma,cr, rv)        ((rv) = vfs_mount(b, ma,cr))
 171#define PVFS_PARSEARGS(b, o,ma,f, rv)   ((rv) = vfs_parseargs(b, o,ma,f))
 172#define PVFS_SHOWARGS(b, m, rv)         ((rv) = vfs_showargs(b, m))
 173#define PVFS_UNMOUNT(b, f,cr, rv)       ((rv) = vfs_unmount(b, f,cr))
 174#define PVFS_MNTUPDATE(b, fl, args, rv) ((rv) = vfs_mntupdate(b, fl, args))
 175#define PVFS_ROOT(b, vpp, rv)           ((rv) = vfs_root(b, vpp))
 176#define PVFS_STATVFS(b, sp,vp, rv)      ((rv) = vfs_statvfs(b, sp,vp))
 177#define PVFS_SYNC(b, flag,cr, rv)       ((rv) = vfs_sync(b, flag,cr))
 178#define PVFS_VGET(b, vpp,fidp, rv)      ((rv) = vfs_vget(b, vpp,fidp))
 179#define PVFS_DMAPIOPS(b, p, rv)         ((rv) = vfs_dmapiops(b, p))
 180#define PVFS_QUOTACTL(b, c,id,p, rv)    ((rv) = vfs_quotactl(b, c,id,p))
 181#define PVFS_INIT_VNODE(b, vp,b2,ul)    ( vfs_init_vnode(b, vp,b2,ul) )
 182#define PVFS_FORCE_SHUTDOWN(b, fl,f,l)  ( vfs_force_shutdown(b, fl,f,l) )
 183#define PVFS_FREEZE(b)                  ( vfs_freeze(b) )
 184
 185extern int vfs_mount(bhv_desc_t *, struct xfs_mount_args *, struct cred *);
 186extern int vfs_parseargs(bhv_desc_t *, char *, struct xfs_mount_args *, int);
 187extern int vfs_showargs(bhv_desc_t *, struct seq_file *);
 188extern int vfs_unmount(bhv_desc_t *, int, struct cred *);
 189extern int vfs_mntupdate(bhv_desc_t *, int *, struct xfs_mount_args *);
 190extern int vfs_root(bhv_desc_t *, struct vnode **);
 191extern int vfs_statvfs(bhv_desc_t *, xfs_statfs_t *, struct vnode *);
 192extern int vfs_sync(bhv_desc_t *, int, struct cred *);
 193extern int vfs_vget(bhv_desc_t *, struct vnode **, struct fid *);
 194extern int vfs_dmapiops(bhv_desc_t *, caddr_t);
 195extern int vfs_quotactl(bhv_desc_t *, int, int, caddr_t);
 196extern void vfs_init_vnode(bhv_desc_t *, struct vnode *, bhv_desc_t *, int);
 197extern void vfs_force_shutdown(bhv_desc_t *, int, char *, int);
 198extern void vfs_freeze(bhv_desc_t *);
 199
 200typedef struct bhv_vfsops {
 201        struct vfsops           bhv_common;
 202        void *                  bhv_custom;
 203} bhv_vfsops_t;
 204
 205#define vfs_bhv_lookup(v, id)   ( bhv_lookup_range(&(v)->vfs_bh, (id), (id)) )
 206#define vfs_bhv_custom(b)       ( ((bhv_vfsops_t *)BHV_OPS(b))->bhv_custom )
 207#define vfs_bhv_set_custom(b,o) ( (b)->bhv_custom = (void *)(o))
 208#define vfs_bhv_clr_custom(b)   ( (b)->bhv_custom = NULL )
 209
 210extern vfs_t *vfs_allocate(void);
 211extern void vfs_deallocate(vfs_t *);
 212extern void vfs_insertops(vfs_t *, bhv_vfsops_t *);
 213extern void vfs_insertbhv(vfs_t *, bhv_desc_t *, vfsops_t *, void *);
 214
 215extern void bhv_insert_all_vfsops(struct vfs *);
 216extern void bhv_remove_all_vfsops(struct vfs *, int);
 217extern void bhv_remove_vfsops(struct vfs *, int);
 218
 219#define fs_frozen(vfsp)         ((vfsp)->vfs_super->s_frozen)
 220#define fs_check_frozen(vfsp, level) \
 221        vfs_check_frozen(vfsp->vfs_super, level);
 222
 223#endif  /* __XFS_VFS_H__ */
 224