fs/xfs/xfs_mount.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_MOUNT_H__
  19 #define __XFS_MOUNT_H__
  20
  21 typedef struct xfs_trans_reservations {
  22         uint    tr_write;       /* extent alloc trans */
  23         uint    tr_itruncate;   /* truncate trans */
  24         uint    tr_rename;      /* rename trans */
  25         uint    tr_link;        /* link trans */
  26         uint    tr_remove;      /* unlink trans */
  27         uint    tr_symlink;     /* symlink trans */
  28         uint    tr_create;      /* create trans */
  29         uint    tr_mkdir;       /* mkdir trans */
  30         uint    tr_ifree;       /* inode free trans */
  31         uint    tr_ichange;     /* inode update trans */
  32         uint    tr_growdata;    /* fs data section grow trans */
  33         uint    tr_swrite;      /* sync write inode trans */
  34         uint    tr_addafork;    /* cvt inode to attributed trans */
  35         uint    tr_writeid;     /* write setuid/setgid file */
  36         uint    tr_attrinval;   /* attr fork buffer invalidation */
  37         uint    tr_attrset;     /* set/create an attribute */
  38         uint    tr_attrrm;      /* remove an attribute */
  39         uint    tr_clearagi;    /* clear bad agi unlinked ino bucket */
  40         uint    tr_growrtalloc; /* grow realtime allocations */
  41         uint    tr_growrtzero;  /* grow realtime zeroing */
  42         uint    tr_growrtfree;  /* grow realtime freeing */
  43 } xfs_trans_reservations_t;
  44
  45 #ifndef __KERNEL__
  46 /*
  47  * Moved here from xfs_ag.h to avoid reordering header files
  48  */
  49 #define XFS_DADDR_TO_AGNO(mp,d) \
  50         ((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
  51 #define XFS_DADDR_TO_AGBNO(mp,d) \
  52         ((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))
  53 #else
  54 struct cred;
  55 struct log;
  56 struct bhv_vfs;
  57 struct bhv_vnode;
  58 struct xfs_mount_args;
  59 struct xfs_ihash;
  60 struct xfs_chash;
  61 struct xfs_inode;
  62 struct xfs_perag;
  63 struct xfs_iocore;
  64 struct xfs_bmbt_irec;
  65 struct xfs_bmap_free;
  66 struct xfs_extdelta;
  67 struct xfs_swapext;
  68
  69 extern struct bhv_vfsops xfs_vfsops;
  70 extern struct bhv_vnodeops xfs_vnodeops;
  71
  72 #define AIL_LOCK_T              lock_t
  73 #define AIL_LOCKINIT(x,y)       spinlock_init(x,y)
  74 #define AIL_LOCK_DESTROY(x)     spinlock_destroy(x)
  75 #define AIL_LOCK(mp,s)          s=mutex_spinlock(&(mp)->m_ail_lock)
  76 #define AIL_UNLOCK(mp,s)        mutex_spinunlock(&(mp)->m_ail_lock, s)
  77
  78
  79 /*
  80  * Prototypes and functions for the Data Migration subsystem.
  81  */
  82
  83 typedef int     (*xfs_send_data_t)(int, struct bhv_vnode *,
  84                         xfs_off_t, size_t, int, bhv_vrwlock_t *);
  85 typedef int     (*xfs_send_mmap_t)(struct vm_area_struct *, uint);
  86 typedef int     (*xfs_send_destroy_t)(struct bhv_vnode *, dm_right_t);
  87 typedef int     (*xfs_send_namesp_t)(dm_eventtype_t, struct bhv_vfs *,
  88                         struct bhv_vnode *,
  89                         dm_right_t, struct bhv_vnode *, dm_right_t,
  90                         char *, char *, mode_t, int, int);
  91 typedef void    (*xfs_send_unmount_t)(struct bhv_vfs *, struct bhv_vnode *,
  92                         dm_right_t, mode_t, int, int);
  93
  94 typedef struct xfs_dmops {
  95         xfs_send_data_t         xfs_send_data;
  96         xfs_send_mmap_t         xfs_send_mmap;
  97         xfs_send_destroy_t      xfs_send_destroy;
  98         xfs_send_namesp_t       xfs_send_namesp;
  99         xfs_send_unmount_t      xfs_send_unmount;
 100 } xfs_dmops_t;
 101
 102 #define XFS_SEND_DATA(mp, ev,vp,off,len,fl,lock) \
 103         (*(mp)->m_dm_ops.xfs_send_data)(ev,vp,off,len,fl,lock)
 104 #define XFS_SEND_MMAP(mp, vma,fl) \
 105         (*(mp)->m_dm_ops.xfs_send_mmap)(vma,fl)
 106 #define XFS_SEND_DESTROY(mp, vp,right) \
 107         (*(mp)->m_dm_ops.xfs_send_destroy)(vp,right)
 108 #define XFS_SEND_NAMESP(mp, ev,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 109         (*(mp)->m_dm_ops.xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 110 #define XFS_SEND_PREUNMOUNT(mp, vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 111         (*(mp)->m_dm_ops.xfs_send_namesp)(DM_EVENT_PREUNMOUNT,vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 112 #define XFS_SEND_UNMOUNT(mp, vfsp,vp,right,mode,rval,fl) \
 113         (*(mp)->m_dm_ops.xfs_send_unmount)(vfsp,vp,right,mode,rval,fl)
 114
 115
 116 /*
 117  * Prototypes and functions for the Quota Management subsystem.
 118  */
 119
 120 struct xfs_dquot;
 121 struct xfs_dqtrxops;
 122 struct xfs_quotainfo;
 123
 124 typedef int     (*xfs_qminit_t)(struct xfs_mount *, uint *, uint *);
 125 typedef int     (*xfs_qmmount_t)(struct xfs_mount *, uint, uint, int);
 126 typedef int     (*xfs_qmunmount_t)(struct xfs_mount *);
 127 typedef void    (*xfs_qmdone_t)(struct xfs_mount *);
 128 typedef void    (*xfs_dqrele_t)(struct xfs_dquot *);
 129 typedef int     (*xfs_dqattach_t)(struct xfs_inode *, uint);
 130 typedef void    (*xfs_dqdetach_t)(struct xfs_inode *);
 131 typedef int     (*xfs_dqpurgeall_t)(struct xfs_mount *, uint);
 132 typedef int     (*xfs_dqvopalloc_t)(struct xfs_mount *,
 133                         struct xfs_inode *, uid_t, gid_t, prid_t, uint,
 134                         struct xfs_dquot **, struct xfs_dquot **);
 135 typedef void    (*xfs_dqvopcreate_t)(struct xfs_trans *, struct xfs_inode *,
 136                         struct xfs_dquot *, struct xfs_dquot *);
 137 typedef int     (*xfs_dqvoprename_t)(struct xfs_inode **);
 138 typedef struct xfs_dquot * (*xfs_dqvopchown_t)(
 139                         struct xfs_trans *, struct xfs_inode *,
 140                         struct xfs_dquot **, struct xfs_dquot *);
 141 typedef int     (*xfs_dqvopchownresv_t)(struct xfs_trans *, struct xfs_inode *,
 142                         struct xfs_dquot *, struct xfs_dquot *, uint);
 143
 144 typedef struct xfs_qmops {
 145         xfs_qminit_t            xfs_qminit;
 146         xfs_qmdone_t            xfs_qmdone;
 147         xfs_qmmount_t           xfs_qmmount;
 148         xfs_qmunmount_t         xfs_qmunmount;
 149         xfs_dqrele_t            xfs_dqrele;
 150         xfs_dqattach_t          xfs_dqattach;
 151         xfs_dqdetach_t          xfs_dqdetach;
 152         xfs_dqpurgeall_t        xfs_dqpurgeall;
 153         xfs_dqvopalloc_t        xfs_dqvopalloc;
 154         xfs_dqvopcreate_t       xfs_dqvopcreate;
 155         xfs_dqvoprename_t       xfs_dqvoprename;
 156         xfs_dqvopchown_t        xfs_dqvopchown;
 157         xfs_dqvopchownresv_t    xfs_dqvopchownresv;
 158         struct xfs_dqtrxops     *xfs_dqtrxops;
 159 } xfs_qmops_t;
 160
 161 #define XFS_QM_INIT(mp, mnt, fl) \
 162         (*(mp)->m_qm_ops.xfs_qminit)(mp, mnt, fl)
 163 #define XFS_QM_MOUNT(mp, mnt, fl, mfsi_flags) \
 164         (*(mp)->m_qm_ops.xfs_qmmount)(mp, mnt, fl, mfsi_flags)
 165 #define XFS_QM_UNMOUNT(mp) \
 166         (*(mp)->m_qm_ops.xfs_qmunmount)(mp)
 167 #define XFS_QM_DONE(mp) \
 168         (*(mp)->m_qm_ops.xfs_qmdone)(mp)
 169 #define XFS_QM_DQRELE(mp, dq) \
 170         (*(mp)->m_qm_ops.xfs_dqrele)(dq)
 171 #define XFS_QM_DQATTACH(mp, ip, fl) \
 172         (*(mp)->m_qm_ops.xfs_dqattach)(ip, fl)
 173 #define XFS_QM_DQDETACH(mp, ip) \
 174         (*(mp)->m_qm_ops.xfs_dqdetach)(ip)
 175 #define XFS_QM_DQPURGEALL(mp, fl) \
 176         (*(mp)->m_qm_ops.xfs_dqpurgeall)(mp, fl)
 177 #define XFS_QM_DQVOPALLOC(mp, ip, uid, gid, prid, fl, dq1, dq2) \
 178         (*(mp)->m_qm_ops.xfs_dqvopalloc)(mp, ip, uid, gid, prid, fl, dq1, dq2)
 179 #define XFS_QM_DQVOPCREATE(mp, tp, ip, dq1, dq2) \
 180         (*(mp)->m_qm_ops.xfs_dqvopcreate)(tp, ip, dq1, dq2)
 181 #define XFS_QM_DQVOPRENAME(mp, ip) \
 182         (*(mp)->m_qm_ops.xfs_dqvoprename)(ip)
 183 #define XFS_QM_DQVOPCHOWN(mp, tp, ip, dqp, dq) \
 184         (*(mp)->m_qm_ops.xfs_dqvopchown)(tp, ip, dqp, dq)
 185 #define XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, dq1, dq2, fl) \
 186         (*(mp)->m_qm_ops.xfs_dqvopchownresv)(tp, ip, dq1, dq2, fl)
 187
 188
 189 /*
 190  * Prototypes and functions for I/O core modularization.
 191  */
 192
 193 typedef int             (*xfs_ioinit_t)(struct bhv_vfs *,
 194                                 struct xfs_mount_args *, int);
 195 typedef int             (*xfs_bmapi_t)(struct xfs_trans *, void *,
 196                                 xfs_fileoff_t, xfs_filblks_t, int,
 197                                 xfs_fsblock_t *, xfs_extlen_t,
 198                                 struct xfs_bmbt_irec *, int *,
 199                                 struct xfs_bmap_free *, struct xfs_extdelta *);
 200 typedef int             (*xfs_bunmapi_t)(struct xfs_trans *,
 201                                 void *, xfs_fileoff_t,
 202                                 xfs_filblks_t, int, xfs_extnum_t,
 203                                 xfs_fsblock_t *, struct xfs_bmap_free *,
 204                                 struct xfs_extdelta *, int *);
 205 typedef int             (*xfs_bmap_eof_t)(void *, xfs_fileoff_t, int, int *);
 206 typedef int             (*xfs_iomap_write_direct_t)(
 207                                 void *, xfs_off_t, size_t, int,
 208                                 struct xfs_bmbt_irec *, int *, int);
 209 typedef int             (*xfs_iomap_write_delay_t)(
 210                                 void *, xfs_off_t, size_t, int,
 211                                 struct xfs_bmbt_irec *, int *);
 212 typedef int             (*xfs_iomap_write_allocate_t)(
 213                                 void *, xfs_off_t, size_t,
 214                                 struct xfs_bmbt_irec *, int *);
 215 typedef int             (*xfs_iomap_write_unwritten_t)(
 216                                 void *, xfs_off_t, size_t);
 217 typedef uint            (*xfs_lck_map_shared_t)(void *);
 218 typedef void            (*xfs_lock_t)(void *, uint);
 219 typedef void            (*xfs_lock_demote_t)(void *, uint);
 220 typedef int             (*xfs_lock_nowait_t)(void *, uint);
 221 typedef void            (*xfs_unlk_t)(void *, unsigned int);
 222 typedef xfs_fsize_t     (*xfs_size_t)(void *);
 223 typedef xfs_fsize_t     (*xfs_iodone_t)(struct bhv_vfs *);
 224 typedef int             (*xfs_swap_extents_t)(void *, void *,
 225                                 struct xfs_swapext*);
 226
 227 typedef struct xfs_ioops {
 228         xfs_ioinit_t                    xfs_ioinit;
 229         xfs_bmapi_t                     xfs_bmapi_func;
 230         xfs_bunmapi_t                   xfs_bunmapi_func;
 231         xfs_bmap_eof_t                  xfs_bmap_eof_func;
 232         xfs_iomap_write_direct_t        xfs_iomap_write_direct;
 233         xfs_iomap_write_delay_t         xfs_iomap_write_delay;
 234         xfs_iomap_write_allocate_t      xfs_iomap_write_allocate;
 235         xfs_iomap_write_unwritten_t     xfs_iomap_write_unwritten;
 236         xfs_lock_t                      xfs_ilock;
 237         xfs_lck_map_shared_t            xfs_lck_map_shared;
 238         xfs_lock_demote_t               xfs_ilock_demote;
 239         xfs_lock_nowait_t               xfs_ilock_nowait;
 240         xfs_unlk_t                      xfs_unlock;
 241         xfs_size_t                      xfs_size_func;
 242         xfs_iodone_t                    xfs_iodone;
 243         xfs_swap_extents_t              xfs_swap_extents_func;
 244 } xfs_ioops_t;
 245
 246 #define XFS_IOINIT(vfsp, args, flags) \
 247         (*(mp)->m_io_ops.xfs_ioinit)(vfsp, args, flags)
 248 #define XFS_BMAPI(mp, trans,io,bno,len,f,first,tot,mval,nmap,flist,delta) \
 249         (*(mp)->m_io_ops.xfs_bmapi_func) \
 250                 (trans,(io)->io_obj,bno,len,f,first,tot,mval,nmap,flist,delta)
 251 #define XFS_BUNMAPI(mp, trans,io,bno,len,f,nexts,first,flist,delta,done) \
 252         (*(mp)->m_io_ops.xfs_bunmapi_func) \
 253                 (trans,(io)->io_obj,bno,len,f,nexts,first,flist,delta,done)
 254 #define XFS_BMAP_EOF(mp, io, endoff, whichfork, eof) \
 255         (*(mp)->m_io_ops.xfs_bmap_eof_func) \
 256                 ((io)->io_obj, endoff, whichfork, eof)
 257 #define XFS_IOMAP_WRITE_DIRECT(mp, io, offset, count, flags, mval, nmap, found)\
 258         (*(mp)->m_io_ops.xfs_iomap_write_direct) \
 259                 ((io)->io_obj, offset, count, flags, mval, nmap, found)
 260 #define XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, flags, mval, nmap) \
 261         (*(mp)->m_io_ops.xfs_iomap_write_delay) \
 262                 ((io)->io_obj, offset, count, flags, mval, nmap)
 263 #define XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, mval, nmap) \
 264         (*(mp)->m_io_ops.xfs_iomap_write_allocate) \
 265                 ((io)->io_obj, offset, count, mval, nmap)
 266 #define XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count) \
 267         (*(mp)->m_io_ops.xfs_iomap_write_unwritten) \
 268                 ((io)->io_obj, offset, count)
 269 #define XFS_LCK_MAP_SHARED(mp, io) \
 270         (*(mp)->m_io_ops.xfs_lck_map_shared)((io)->io_obj)
 271 #define XFS_ILOCK(mp, io, mode) \
 272         (*(mp)->m_io_ops.xfs_ilock)((io)->io_obj, mode)
 273 #define XFS_ILOCK_NOWAIT(mp, io, mode) \
 274         (*(mp)->m_io_ops.xfs_ilock_nowait)((io)->io_obj, mode)
 275 #define XFS_IUNLOCK(mp, io, mode) \
 276         (*(mp)->m_io_ops.xfs_unlock)((io)->io_obj, mode)
 277 #define XFS_ILOCK_DEMOTE(mp, io, mode) \
 278         (*(mp)->m_io_ops.xfs_ilock_demote)((io)->io_obj, mode)
 279 #define XFS_SIZE(mp, io) \
 280         (*(mp)->m_io_ops.xfs_size_func)((io)->io_obj)
 281 #define XFS_IODONE(vfsp) \
 282         (*(mp)->m_io_ops.xfs_iodone)(vfsp)
 283 #define XFS_SWAP_EXTENTS(mp, io, tio, sxp) \
 284         (*(mp)->m_io_ops.xfs_swap_extents_func) \
 285                 ((io)->io_obj, (tio)->io_obj, sxp)
 286
 287 #ifdef HAVE_PERCPU_SB
 288
 289 /*
 290  * Valid per-cpu incore superblock counters. Note that if you add new counters,
 291  * you may need to define new counter disabled bit field descriptors as there
 292  * are more possible fields in the superblock that can fit in a bitfield on a
 293  * 32 bit platform. The XFS_SBS_* values for the current current counters just
 294  * fit.
 295  */
 296 typedef struct xfs_icsb_cnts {
 297         uint64_t        icsb_fdblocks;
 298         uint64_t        icsb_ifree;
 299         uint64_t        icsb_icount;
 300         unsigned long   icsb_flags;
 301 } xfs_icsb_cnts_t;
 302
 303 #define XFS_ICSB_FLAG_LOCK      (1 << 0)        /* counter lock bit */
 304
 305 #define XFS_ICSB_SB_LOCKED      (1 << 0)        /* sb already locked */
 306 #define XFS_ICSB_LAZY_COUNT     (1 << 1)        /* accuracy not needed */
 307
 308 extern int      xfs_icsb_init_counters(struct xfs_mount *);
 309 extern void     xfs_icsb_sync_counters_lazy(struct xfs_mount *);
 310
 311 #else
 312 #define xfs_icsb_init_counters(mp)      (0)
 313 #define xfs_icsb_sync_counters_lazy(mp) do { } while (0)
 314 #endif
 315
 316 typedef struct xfs_mount {
 317         bhv_desc_t              m_bhv;          /* vfs xfs behavior */
 318         xfs_tid_t               m_tid;          /* next unused tid for fs */
 319         AIL_LOCK_T              m_ail_lock;     /* fs AIL mutex */
 320         xfs_ail_entry_t         m_ail;          /* fs active log item list */
 321         uint                    m_ail_gen;      /* fs AIL generation count */
 322         xfs_sb_t                m_sb;           /* copy of fs superblock */
 323         lock_t                  m_sb_lock;      /* sb counter mutex */
 324         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
 325         char                    *m_fsname;      /* filesystem name */
 326         int                     m_fsname_len;   /* strlen of fs name */
 327         char                    *m_rtname;      /* realtime device name */
 328         char                    *m_logname;     /* external log device name */
 329         int                     m_bsize;        /* fs logical block size */
 330         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
 331         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
 332         lock_t                  m_agirotor_lock;/* .. and lock protecting it */
 333         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
 334         uint                    m_ihsize;       /* size of next field */
 335         struct xfs_ihash        *m_ihash;       /* fs private inode hash table*/
 336         struct xfs_inode        *m_inodes;      /* active inode list */
 337         struct list_head        m_del_inodes;   /* inodes to reclaim */
 338         mutex_t                 m_ilock;        /* inode list mutex */
 339         uint                    m_ireclaims;    /* count of calls to reclaim*/
 340         uint                    m_readio_log;   /* min read size log bytes */
 341         uint                    m_readio_blocks; /* min read size blocks */
 342         uint                    m_writeio_log;  /* min write size log bytes */
 343         uint                    m_writeio_blocks; /* min write size blocks */
 344         struct log              *m_log;         /* log specific stuff */
 345         int                     m_logbufs;      /* number of log buffers */
 346         int                     m_logbsize;     /* size of each log buffer */
 347         uint                    m_rsumlevels;   /* rt summary levels */
 348         uint                    m_rsumsize;     /* size of rt summary, bytes */
 349         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 350         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 351         struct xfs_inode        *m_rootip;      /* pointer to root directory */
 352         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 353         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 354         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 355         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 356         __uint8_t               m_dircook_elog; /* log d-cookie entry bits */
 357         __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
 358         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
 359         __uint8_t               m_agno_log;     /* log #ag's */
 360         __uint8_t               m_agino_log;    /* #bits for agino in inum */
 361         __uint8_t               m_nreadaheads;  /* #readahead buffers */
 362         __uint16_t              m_inode_cluster_size;/* min inode buf size */
 363         uint                    m_blockmask;    /* sb_blocksize-1 */
 364         uint                    m_blockwsize;   /* sb_blocksize in words */
 365         uint                    m_blockwmask;   /* blockwsize-1 */
 366         uint                    m_alloc_mxr[2]; /* XFS_ALLOC_BLOCK_MAXRECS */
 367         uint                    m_alloc_mnr[2]; /* XFS_ALLOC_BLOCK_MINRECS */
 368         uint                    m_bmap_dmxr[2]; /* XFS_BMAP_BLOCK_DMAXRECS */
 369         uint                    m_bmap_dmnr[2]; /* XFS_BMAP_BLOCK_DMINRECS */
 370         uint                    m_inobt_mxr[2]; /* XFS_INOBT_BLOCK_MAXRECS */
 371         uint                    m_inobt_mnr[2]; /* XFS_INOBT_BLOCK_MINRECS */
 372         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 373         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 374         uint                    m_in_maxlevels; /* XFS_IN_MAXLEVELS */
 375         struct xfs_perag        *m_perag;       /* per-ag accounting info */
 376         struct rw_semaphore     m_peraglock;    /* lock for m_perag (pointer) */
 377         sema_t                  m_growlock;     /* growfs mutex */
 378         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 379         uint                    m_dmevmask;     /* DMI events for this FS */
 380         __uint64_t              m_flags;        /* global mount flags */
 381         uint                    m_attroffset;   /* inode attribute offset */
 382         uint                    m_dir_node_ents; /* #entries in a dir danode */
 383         uint                    m_attr_node_ents; /* #entries in attr danode */
 384         int                     m_ialloc_inos;  /* inodes in inode allocation */
 385         int                     m_ialloc_blks;  /* blocks in inode allocation */
 386         int                     m_litino;       /* size of inode union area */
 387         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 388         uint                    m_qflags;       /* quota status flags */
 389         xfs_trans_reservations_t m_reservations;/* precomputed res values */
 390         __uint64_t              m_maxicount;    /* maximum inode count */
 391         __uint64_t              m_maxioffset;   /* maximum inode offset */
 392         __uint64_t              m_resblks;      /* total reserved blocks */
 393         __uint64_t              m_resblks_avail;/* available reserved blocks */
 394 #if XFS_BIG_INUMS
 395         xfs_ino_t               m_inoadd;       /* add value for ino64_offset */
 396 #endif
 397         int                     m_dalign;       /* stripe unit */
 398         int                     m_swidth;       /* stripe width */
 399         int                     m_sinoalign;    /* stripe unit inode alignment */
 400         int                     m_attr_magicpct;/* 37% of the blocksize */
 401         int                     m_dir_magicpct; /* 37% of the dir blocksize */
 402         __uint8_t               m_mk_sharedro;  /* mark shared ro on unmount */
 403         __uint8_t               m_inode_quiesce;/* call quiesce on new inodes.
 404                                                    field governed by m_ilock */
 405         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 406         int                     m_dirblksize;   /* directory block sz--bytes */
 407         int                     m_dirblkfsbs;   /* directory block sz--fsbs */
 408         xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */
 409         xfs_dablk_t             m_dirleafblk;   /* blockno of dir non-data v2 */
 410         xfs_dablk_t             m_dirfreeblk;   /* blockno of dirfreeindex v2 */
 411         uint                    m_chsize;       /* size of next field */
 412         struct xfs_chash        *m_chash;       /* fs private inode per-cluster
 413                                                  * hash table */
 414         struct xfs_dmops        m_dm_ops;       /* vector of DMI ops */
 415         struct xfs_qmops        m_qm_ops;       /* vector of XQM ops */
 416         struct xfs_ioops        m_io_ops;       /* vector of I/O ops */
 417         atomic_t                m_active_trans; /* number trans frozen */
 418 #ifdef HAVE_PERCPU_SB
 419         xfs_icsb_cnts_t         *m_sb_cnts;     /* per-cpu superblock counters */
 420         unsigned long           m_icsb_counters; /* disabled per-cpu counters */
 421         struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
 422 #endif
 423 } xfs_mount_t;
 424
 425 /*
 426  * Flags for m_flags.
 427  */
 428 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 429                                                    must be synchronous except
 430                                                    for space allocations */
 431 #define XFS_MOUNT_INO64         (1ULL << 1)
 432                              /* (1ULL << 2)     -- currently unused */
 433                              /* (1ULL << 3)     -- currently unused */
 434 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 435                                                    operations, typically for
 436                                                    disk errors in metadata */
 437 #define XFS_MOUNT_RETERR        (1ULL << 6)     /* return alignment errors to
 438                                                    user */
 439 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 440                                                    allocations */
 441 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 442                              /* (1ULL << 9)     -- currently unused */
 443 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 444 #define XFS_MOUNT_SHARED        (1ULL << 11)    /* shared mount */
 445 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 446 #define XFS_MOUNT_OSYNCISOSYNC  (1ULL << 13)    /* o_sync is REALLY o_sync */
 447                                                 /* osyncisdsync is now default*/
 448 #define XFS_MOUNT_32BITINODES   (1ULL << 14)    /* do not create inodes above
 449                                                  * 32 bits in size */
 450                              /* (1ULL << 15)    -- currently unused */
 451 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 452 #define XFS_MOUNT_BARRIER       (1ULL << 17)
 453 #define XFS_MOUNT_IDELETE       (1ULL << 18)    /* delete empty inode clusters*/
 454 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 455                                                  * allocation */
 456 #define XFS_MOUNT_IHASHSIZE     (1ULL << 20)    /* inode hash table size */
 457 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 458 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 459                                                  * I/O size in stat() */
 460 #define XFS_MOUNT_NO_PERCPU_SB  (1ULL << 23)    /* don't use per-cpu superblock
 461                                                    counters */
 462
 463
 464 /*
 465  * Default minimum read and write sizes.
 466  */
 467 #define XFS_READIO_LOG_LARGE    16
 468 #define XFS_WRITEIO_LOG_LARGE   16
 469
 470 /*
 471  * Max and min values for mount-option defined I/O
 472  * preallocation sizes.
 473  */
 474 #define XFS_MAX_IO_LOG          30      /* 1G */
 475 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 476
 477 /*
 478  * Synchronous read and write sizes.  This should be
 479  * better for NFSv2 wsync filesystems.
 480  */
 481 #define XFS_WSYNC_READIO_LOG    15      /* 32K */
 482 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16K */
 483
 484 /*
 485  * Allow large block sizes to be reported to userspace programs if the
 486  * "largeio" mount option is used.
 487  *
 488  * If compatibility mode is specified, simply return the basic unit of caching
 489  * so that we don't get inefficient read/modify/write I/O from user apps.
 490  * Otherwise....
 491  *
 492  * If the underlying volume is a stripe, then return the stripe width in bytes
 493  * as the recommended I/O size. It is not a stripe and we've set a default
 494  * buffered I/O size, return that, otherwise return the compat default.
 495  */
 496 static inline unsigned long
 497 xfs_preferred_iosize(xfs_mount_t *mp)
 498 {
 499         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 500                 return PAGE_CACHE_SIZE;
 501         return (mp->m_swidth ?
 502                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 503                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 504                         (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 505                         PAGE_CACHE_SIZE));
 506 }
 507
 508 #define XFS_MAXIOFFSET(mp)      ((mp)->m_maxioffset)
 509
 510 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 511 #define xfs_force_shutdown(m,f) \
 512         bhv_vfs_force_shutdown((XFS_MTOVFS(m)), f, __FILE__, __LINE__)
 513
 514 /*
 515  * Flags for xfs_mountfs
 516  */
 517 #define XFS_MFSI_SECOND         0x01    /* Secondary mount -- skip stuff */
 518 #define XFS_MFSI_CLIENT         0x02    /* Is a client -- skip lots of stuff */
 519 /*      XFS_MFSI_RRINODES       */
 520 #define XFS_MFSI_NOUNLINK       0x08    /* Skip unlinked inode processing in */
 521                                         /* log recovery */
 522 #define XFS_MFSI_NO_QUOTACHECK  0x10    /* Skip quotacheck processing */
 523 /*      XFS_MFSI_CONVERT_SUNIT  */
 524 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 525
 526 /*
 527  * Macros for getting from mount to vfs and back.
 528  */
 529 #define XFS_MTOVFS(mp)          xfs_mtovfs(mp)
 530 static inline struct bhv_vfs *xfs_mtovfs(xfs_mount_t *mp)
 531 {
 532         return bhvtovfs(&mp->m_bhv);
 533 }
 534
 535 #define XFS_BHVTOM(bdp) xfs_bhvtom(bdp)
 536 static inline xfs_mount_t *xfs_bhvtom(bhv_desc_t *bdp)
 537 {
 538         return (xfs_mount_t *)BHV_PDATA(bdp);
 539 }
 540
 541 #define XFS_VFSTOM(vfs) xfs_vfstom(vfs)
 542 static inline xfs_mount_t *xfs_vfstom(bhv_vfs_t *vfs)
 543 {
 544         return XFS_BHVTOM(bhv_lookup(VFS_BHVHEAD(vfs), &xfs_vfsops));
 545 }
 546
 547 #define XFS_DADDR_TO_AGNO(mp,d)         xfs_daddr_to_agno(mp,d)
 548 static inline xfs_agnumber_t
 549 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 550 {
 551         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 552         do_div(ld, mp->m_sb.sb_agblocks);
 553         return (xfs_agnumber_t) ld;
 554 }
 555
 556 #define XFS_DADDR_TO_AGBNO(mp,d)        xfs_daddr_to_agbno(mp,d)
 557 static inline xfs_agblock_t
 558 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 559 {
 560         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 561         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 562 }
 563
 564 /*
 565  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
 566  */
 567 typedef struct xfs_mod_sb {
 568         xfs_sb_field_t  msb_field;      /* Field to modify, see below */
 569         int             msb_delta;      /* Change to make to specified field */
 570 } xfs_mod_sb_t;
 571
 572 #define XFS_MOUNT_ILOCK(mp)     mutex_lock(&((mp)->m_ilock))
 573 #define XFS_MOUNT_IUNLOCK(mp)   mutex_unlock(&((mp)->m_ilock))
 574 #define XFS_SB_LOCK(mp)         mutex_spinlock(&(mp)->m_sb_lock)
 575 #define XFS_SB_UNLOCK(mp,s)     mutex_spinunlock(&(mp)->m_sb_lock,(s))
 576
 577 extern xfs_mount_t *xfs_mount_init(void);
 578 extern void     xfs_mod_sb(xfs_trans_t *, __int64_t);
 579 extern void     xfs_mount_free(xfs_mount_t *mp, int remove_bhv);
 580 extern int      xfs_mountfs(struct bhv_vfs *, xfs_mount_t *mp, int);
 581 extern void     xfs_mountfs_check_barriers(xfs_mount_t *mp);
 582
 583 extern int      xfs_unmountfs(xfs_mount_t *, struct cred *);
 584 extern void     xfs_unmountfs_close(xfs_mount_t *, struct cred *);
 585 extern int      xfs_unmountfs_writesb(xfs_mount_t *);
 586 extern int      xfs_unmount_flush(xfs_mount_t *, int);
 587 extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int, int);
 588 extern int      xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t,
 589                         int, int);
 590 extern int      xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 591                         uint, int);
 592 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 593 extern int      xfs_readsb(xfs_mount_t *, int);
 594 extern void     xfs_freesb(xfs_mount_t *);
 595 extern void     xfs_do_force_shutdown(bhv_desc_t *, int, char *, int);
 596 extern int      xfs_syncsub(xfs_mount_t *, int, int, int *);
 597 extern int      xfs_sync_inodes(xfs_mount_t *, int, int, int *);
 598 extern xfs_agnumber_t   xfs_initialize_perag(struct bhv_vfs *, xfs_mount_t *,
 599                                                 xfs_agnumber_t);
 600 extern void     xfs_xlatesb(void *, struct xfs_sb *, int, __int64_t);
 601
 602 extern struct xfs_dmops xfs_dmcore_stub;
 603 extern struct xfs_qmops xfs_qmcore_stub;
 604 extern struct xfs_ioops xfs_iocore_xfs;
 605
 606 extern int      xfs_init(void);
 607 extern void     xfs_cleanup(void);
 608
 609 #endif  /* __KERNEL__ */
 610
 611 #endif  /* __XFS_MOUNT_H__ */