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 vfs;
  57 struct 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
  67 extern struct vfsops xfs_vfsops;
  68 extern struct vnodeops xfs_vnodeops;
  69
  70 #define AIL_LOCK_T              lock_t
  71 #define AIL_LOCKINIT(x,y)       spinlock_init(x,y)
  72 #define AIL_LOCK_DESTROY(x)     spinlock_destroy(x)
  73 #define AIL_LOCK(mp,s)          s=mutex_spinlock(&(mp)->m_ail_lock)
  74 #define AIL_UNLOCK(mp,s)        mutex_spinunlock(&(mp)->m_ail_lock, s)
  75
  76
  77 /*
  78  * Prototypes and functions for the Data Migration subsystem.
  79  */
  80
  81 typedef int     (*xfs_send_data_t)(int, struct vnode *,
  82                         xfs_off_t, size_t, int, vrwlock_t *);
  83 typedef int     (*xfs_send_mmap_t)(struct vm_area_struct *, uint);
  84 typedef int     (*xfs_send_destroy_t)(struct vnode *, dm_right_t);
  85 typedef int     (*xfs_send_namesp_t)(dm_eventtype_t, struct vfs *,
  86                         struct vnode *,
  87                         dm_right_t, struct vnode *, dm_right_t,
  88                         char *, char *, mode_t, int, int);
  89 typedef void    (*xfs_send_unmount_t)(struct vfs *, struct vnode *,
  90                         dm_right_t, mode_t, int, int);
  91
  92 typedef struct xfs_dmops {
  93         xfs_send_data_t         xfs_send_data;
  94         xfs_send_mmap_t         xfs_send_mmap;
  95         xfs_send_destroy_t      xfs_send_destroy;
  96         xfs_send_namesp_t       xfs_send_namesp;
  97         xfs_send_unmount_t      xfs_send_unmount;
  98 } xfs_dmops_t;
  99
 100 #define XFS_SEND_DATA(mp, ev,vp,off,len,fl,lock) \
 101         (*(mp)->m_dm_ops.xfs_send_data)(ev,vp,off,len,fl,lock)
 102 #define XFS_SEND_MMAP(mp, vma,fl) \
 103         (*(mp)->m_dm_ops.xfs_send_mmap)(vma,fl)
 104 #define XFS_SEND_DESTROY(mp, vp,right) \
 105         (*(mp)->m_dm_ops.xfs_send_destroy)(vp,right)
 106 #define XFS_SEND_NAMESP(mp, ev,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 107         (*(mp)->m_dm_ops.xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 108 #define XFS_SEND_PREUNMOUNT(mp, vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
 109         (*(mp)->m_dm_ops.xfs_send_namesp)(DM_EVENT_PREUNMOUNT,vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl)
 110 #define XFS_SEND_UNMOUNT(mp, vfsp,vp,right,mode,rval,fl) \
 111         (*(mp)->m_dm_ops.xfs_send_unmount)(vfsp,vp,right,mode,rval,fl)
 112
 113
 114 /*
 115  * Prototypes and functions for the Quota Management subsystem.
 116  */
 117
 118 struct xfs_dquot;
 119 struct xfs_dqtrxops;
 120 struct xfs_quotainfo;
 121
 122 typedef int     (*xfs_qminit_t)(struct xfs_mount *, uint *, uint *);
 123 typedef int     (*xfs_qmmount_t)(struct xfs_mount *, uint, uint, int);
 124 typedef int     (*xfs_qmunmount_t)(struct xfs_mount *);
 125 typedef void    (*xfs_qmdone_t)(struct xfs_mount *);
 126 typedef void    (*xfs_dqrele_t)(struct xfs_dquot *);
 127 typedef int     (*xfs_dqattach_t)(struct xfs_inode *, uint);
 128 typedef void    (*xfs_dqdetach_t)(struct xfs_inode *);
 129 typedef int     (*xfs_dqpurgeall_t)(struct xfs_mount *, uint);
 130 typedef int     (*xfs_dqvopalloc_t)(struct xfs_mount *,
 131                         struct xfs_inode *, uid_t, gid_t, prid_t, uint,
 132                         struct xfs_dquot **, struct xfs_dquot **);
 133 typedef void    (*xfs_dqvopcreate_t)(struct xfs_trans *, struct xfs_inode *,
 134                         struct xfs_dquot *, struct xfs_dquot *);
 135 typedef int     (*xfs_dqvoprename_t)(struct xfs_inode **);
 136 typedef struct xfs_dquot * (*xfs_dqvopchown_t)(
 137                         struct xfs_trans *, struct xfs_inode *,
 138                         struct xfs_dquot **, struct xfs_dquot *);
 139 typedef int     (*xfs_dqvopchownresv_t)(struct xfs_trans *, struct xfs_inode *,
 140                         struct xfs_dquot *, struct xfs_dquot *, uint);
 141
 142 typedef struct xfs_qmops {
 143         xfs_qminit_t            xfs_qminit;
 144         xfs_qmdone_t            xfs_qmdone;
 145         xfs_qmmount_t           xfs_qmmount;
 146         xfs_qmunmount_t         xfs_qmunmount;
 147         xfs_dqrele_t            xfs_dqrele;
 148         xfs_dqattach_t          xfs_dqattach;
 149         xfs_dqdetach_t          xfs_dqdetach;
 150         xfs_dqpurgeall_t        xfs_dqpurgeall;
 151         xfs_dqvopalloc_t        xfs_dqvopalloc;
 152         xfs_dqvopcreate_t       xfs_dqvopcreate;
 153         xfs_dqvoprename_t       xfs_dqvoprename;
 154         xfs_dqvopchown_t        xfs_dqvopchown;
 155         xfs_dqvopchownresv_t    xfs_dqvopchownresv;
 156         struct xfs_dqtrxops     *xfs_dqtrxops;
 157 } xfs_qmops_t;
 158
 159 #define XFS_QM_INIT(mp, mnt, fl) \
 160         (*(mp)->m_qm_ops.xfs_qminit)(mp, mnt, fl)
 161 #define XFS_QM_MOUNT(mp, mnt, fl, mfsi_flags) \
 162         (*(mp)->m_qm_ops.xfs_qmmount)(mp, mnt, fl, mfsi_flags)
 163 #define XFS_QM_UNMOUNT(mp) \
 164         (*(mp)->m_qm_ops.xfs_qmunmount)(mp)
 165 #define XFS_QM_DONE(mp) \
 166         (*(mp)->m_qm_ops.xfs_qmdone)(mp)
 167 #define XFS_QM_DQRELE(mp, dq) \
 168         (*(mp)->m_qm_ops.xfs_dqrele)(dq)
 169 #define XFS_QM_DQATTACH(mp, ip, fl) \
 170         (*(mp)->m_qm_ops.xfs_dqattach)(ip, fl)
 171 #define XFS_QM_DQDETACH(mp, ip) \
 172         (*(mp)->m_qm_ops.xfs_dqdetach)(ip)
 173 #define XFS_QM_DQPURGEALL(mp, fl) \
 174         (*(mp)->m_qm_ops.xfs_dqpurgeall)(mp, fl)
 175 #define XFS_QM_DQVOPALLOC(mp, ip, uid, gid, prid, fl, dq1, dq2) \
 176         (*(mp)->m_qm_ops.xfs_dqvopalloc)(mp, ip, uid, gid, prid, fl, dq1, dq2)
 177 #define XFS_QM_DQVOPCREATE(mp, tp, ip, dq1, dq2) \
 178         (*(mp)->m_qm_ops.xfs_dqvopcreate)(tp, ip, dq1, dq2)
 179 #define XFS_QM_DQVOPRENAME(mp, ip) \
 180         (*(mp)->m_qm_ops.xfs_dqvoprename)(ip)
 181 #define XFS_QM_DQVOPCHOWN(mp, tp, ip, dqp, dq) \
 182         (*(mp)->m_qm_ops.xfs_dqvopchown)(tp, ip, dqp, dq)
 183 #define XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, dq1, dq2, fl) \
 184         (*(mp)->m_qm_ops.xfs_dqvopchownresv)(tp, ip, dq1, dq2, fl)
 185
 186
 187 /*
 188  * Prototypes and functions for I/O core modularization.
 189  */
 190
 191 typedef int             (*xfs_ioinit_t)(struct vfs *,
 192                                 struct xfs_mount_args *, int);
 193 typedef int             (*xfs_bmapi_t)(struct xfs_trans *, void *,
 194                                 xfs_fileoff_t, xfs_filblks_t, int,
 195                                 xfs_fsblock_t *, xfs_extlen_t,
 196                                 struct xfs_bmbt_irec *, int *,
 197                                 struct xfs_bmap_free *);
 198 typedef int             (*xfs_bmap_eof_t)(void *, xfs_fileoff_t, int, int *);
 199 typedef int             (*xfs_iomap_write_direct_t)(
 200                                 void *, xfs_off_t, size_t, int,
 201                                 struct xfs_bmbt_irec *, int *, int);
 202 typedef int             (*xfs_iomap_write_delay_t)(
 203                                 void *, xfs_off_t, size_t, int,
 204                                 struct xfs_bmbt_irec *, int *);
 205 typedef int             (*xfs_iomap_write_allocate_t)(
 206                                 void *, xfs_off_t, size_t,
 207                                 struct xfs_bmbt_irec *, int *);
 208 typedef int             (*xfs_iomap_write_unwritten_t)(
 209                                 void *, xfs_off_t, size_t);
 210 typedef uint            (*xfs_lck_map_shared_t)(void *);
 211 typedef void            (*xfs_lock_t)(void *, uint);
 212 typedef void            (*xfs_lock_demote_t)(void *, uint);
 213 typedef int             (*xfs_lock_nowait_t)(void *, uint);
 214 typedef void            (*xfs_unlk_t)(void *, unsigned int);
 215 typedef xfs_fsize_t     (*xfs_size_t)(void *);
 216 typedef xfs_fsize_t     (*xfs_iodone_t)(struct vfs *);
 217
 218 typedef struct xfs_ioops {
 219         xfs_ioinit_t                    xfs_ioinit;
 220         xfs_bmapi_t                     xfs_bmapi_func;
 221         xfs_bmap_eof_t                  xfs_bmap_eof_func;
 222         xfs_iomap_write_direct_t        xfs_iomap_write_direct;
 223         xfs_iomap_write_delay_t         xfs_iomap_write_delay;
 224         xfs_iomap_write_allocate_t      xfs_iomap_write_allocate;
 225         xfs_iomap_write_unwritten_t     xfs_iomap_write_unwritten;
 226         xfs_lock_t                      xfs_ilock;
 227         xfs_lck_map_shared_t            xfs_lck_map_shared;
 228         xfs_lock_demote_t               xfs_ilock_demote;
 229         xfs_lock_nowait_t               xfs_ilock_nowait;
 230         xfs_unlk_t                      xfs_unlock;
 231         xfs_size_t                      xfs_size_func;
 232         xfs_iodone_t                    xfs_iodone;
 233 } xfs_ioops_t;
 234
 235 #define XFS_IOINIT(vfsp, args, flags) \
 236         (*(mp)->m_io_ops.xfs_ioinit)(vfsp, args, flags)
 237 #define XFS_BMAPI(mp, trans,io,bno,len,f,first,tot,mval,nmap,flist)     \
 238         (*(mp)->m_io_ops.xfs_bmapi_func) \
 239                 (trans,(io)->io_obj,bno,len,f,first,tot,mval,nmap,flist)
 240 #define XFS_BMAP_EOF(mp, io, endoff, whichfork, eof) \
 241         (*(mp)->m_io_ops.xfs_bmap_eof_func) \
 242                 ((io)->io_obj, endoff, whichfork, eof)
 243 #define XFS_IOMAP_WRITE_DIRECT(mp, io, offset, count, flags, mval, nmap, found)\
 244         (*(mp)->m_io_ops.xfs_iomap_write_direct) \
 245                 ((io)->io_obj, offset, count, flags, mval, nmap, found)
 246 #define XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, flags, mval, nmap) \
 247         (*(mp)->m_io_ops.xfs_iomap_write_delay) \
 248                 ((io)->io_obj, offset, count, flags, mval, nmap)
 249 #define XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, mval, nmap) \
 250         (*(mp)->m_io_ops.xfs_iomap_write_allocate) \
 251                 ((io)->io_obj, offset, count, mval, nmap)
 252 #define XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count) \
 253         (*(mp)->m_io_ops.xfs_iomap_write_unwritten) \
 254                 ((io)->io_obj, offset, count)
 255 #define XFS_LCK_MAP_SHARED(mp, io) \
 256         (*(mp)->m_io_ops.xfs_lck_map_shared)((io)->io_obj)
 257 #define XFS_ILOCK(mp, io, mode) \
 258         (*(mp)->m_io_ops.xfs_ilock)((io)->io_obj, mode)
 259 #define XFS_ILOCK_NOWAIT(mp, io, mode) \
 260         (*(mp)->m_io_ops.xfs_ilock_nowait)((io)->io_obj, mode)
 261 #define XFS_IUNLOCK(mp, io, mode) \
 262         (*(mp)->m_io_ops.xfs_unlock)((io)->io_obj, mode)
 263 #define XFS_ILOCK_DEMOTE(mp, io, mode) \
 264         (*(mp)->m_io_ops.xfs_ilock_demote)((io)->io_obj, mode)
 265 #define XFS_SIZE(mp, io) \
 266         (*(mp)->m_io_ops.xfs_size_func)((io)->io_obj)
 267 #define XFS_IODONE(vfsp) \
 268         (*(mp)->m_io_ops.xfs_iodone)(vfsp)
 269
 270 #ifdef HAVE_PERCPU_SB
 271
 272 /*
 273  * Valid per-cpu incore superblock counters. Note that if you add new counters,
 274  * you may need to define new counter disabled bit field descriptors as there
 275  * are more possible fields in the superblock that can fit in a bitfield on a
 276  * 32 bit platform. The XFS_SBS_* values for the current current counters just
 277  * fit.
 278  */
 279 typedef struct xfs_icsb_cnts {
 280         uint64_t        icsb_fdblocks;
 281         uint64_t        icsb_ifree;
 282         uint64_t        icsb_icount;
 283         unsigned long   icsb_flags;
 284 } xfs_icsb_cnts_t;
 285
 286 #define XFS_ICSB_FLAG_LOCK      (1 << 0)        /* counter lock bit */
 287
 288 #define XFS_ICSB_SB_LOCKED      (1 << 0)        /* sb already locked */
 289 #define XFS_ICSB_LAZY_COUNT     (1 << 1)        /* accuracy not needed */
 290
 291 extern int      xfs_icsb_init_counters(struct xfs_mount *);
 292 extern void     xfs_icsb_sync_counters_lazy(struct xfs_mount *);
 293
 294 #else
 295 #define xfs_icsb_init_counters(mp)      (0)
 296 #define xfs_icsb_sync_counters_lazy(mp) do { } while (0)
 297 #endif
 298
 299 typedef struct xfs_mount {
 300         bhv_desc_t              m_bhv;          /* vfs xfs behavior */
 301         xfs_tid_t               m_tid;          /* next unused tid for fs */
 302         AIL_LOCK_T              m_ail_lock;     /* fs AIL mutex */
 303         xfs_ail_entry_t         m_ail;          /* fs active log item list */
 304         uint                    m_ail_gen;      /* fs AIL generation count */
 305         xfs_sb_t                m_sb;           /* copy of fs superblock */
 306         lock_t                  m_sb_lock;      /* sb counter mutex */
 307         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
 308         char                    *m_fsname;      /* filesystem name */
 309         int                     m_fsname_len;   /* strlen of fs name */
 310         char                    *m_rtname;      /* realtime device name */
 311         char                    *m_logname;     /* external log device name */
 312         int                     m_bsize;        /* fs logical block size */
 313         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
 314         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
 315         lock_t                  m_agirotor_lock;/* .. and lock protecting it */
 316         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
 317         uint                    m_ihsize;       /* size of next field */
 318         struct xfs_ihash        *m_ihash;       /* fs private inode hash table*/
 319         struct xfs_inode        *m_inodes;      /* active inode list */
 320         struct list_head        m_del_inodes;   /* inodes to reclaim */
 321         mutex_t                 m_ilock;        /* inode list mutex */
 322         uint                    m_ireclaims;    /* count of calls to reclaim*/
 323         uint                    m_readio_log;   /* min read size log bytes */
 324         uint                    m_readio_blocks; /* min read size blocks */
 325         uint                    m_writeio_log;  /* min write size log bytes */
 326         uint                    m_writeio_blocks; /* min write size blocks */
 327         struct log              *m_log;         /* log specific stuff */
 328         int                     m_logbufs;      /* number of log buffers */
 329         int                     m_logbsize;     /* size of each log buffer */
 330         uint                    m_rsumlevels;   /* rt summary levels */
 331         uint                    m_rsumsize;     /* size of rt summary, bytes */
 332         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 333         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 334         struct xfs_inode        *m_rootip;      /* pointer to root directory */
 335         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 336         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 337         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 338         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 339         __uint8_t               m_dircook_elog; /* log d-cookie entry bits */
 340         __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
 341         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
 342         __uint8_t               m_agno_log;     /* log #ag's */
 343         __uint8_t               m_agino_log;    /* #bits for agino in inum */
 344         __uint8_t               m_nreadaheads;  /* #readahead buffers */
 345         __uint16_t              m_inode_cluster_size;/* min inode buf size */
 346         uint                    m_blockmask;    /* sb_blocksize-1 */
 347         uint                    m_blockwsize;   /* sb_blocksize in words */
 348         uint                    m_blockwmask;   /* blockwsize-1 */
 349         uint                    m_alloc_mxr[2]; /* XFS_ALLOC_BLOCK_MAXRECS */
 350         uint                    m_alloc_mnr[2]; /* XFS_ALLOC_BLOCK_MINRECS */
 351         uint                    m_bmap_dmxr[2]; /* XFS_BMAP_BLOCK_DMAXRECS */
 352         uint                    m_bmap_dmnr[2]; /* XFS_BMAP_BLOCK_DMINRECS */
 353         uint                    m_inobt_mxr[2]; /* XFS_INOBT_BLOCK_MAXRECS */
 354         uint                    m_inobt_mnr[2]; /* XFS_INOBT_BLOCK_MINRECS */
 355         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 356         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 357         uint                    m_in_maxlevels; /* XFS_IN_MAXLEVELS */
 358         struct xfs_perag        *m_perag;       /* per-ag accounting info */
 359         struct rw_semaphore     m_peraglock;    /* lock for m_perag (pointer) */
 360         sema_t                  m_growlock;     /* growfs mutex */
 361         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 362         uint                    m_dmevmask;     /* DMI events for this FS */
 363         __uint64_t              m_flags;        /* global mount flags */
 364         uint                    m_attroffset;   /* inode attribute offset */
 365         uint                    m_dir_node_ents; /* #entries in a dir danode */
 366         uint                    m_attr_node_ents; /* #entries in attr danode */
 367         int                     m_ialloc_inos;  /* inodes in inode allocation */
 368         int                     m_ialloc_blks;  /* blocks in inode allocation */
 369         int                     m_litino;       /* size of inode union area */
 370         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 371         uint                    m_qflags;       /* quota status flags */
 372         xfs_trans_reservations_t m_reservations;/* precomputed res values */
 373         __uint64_t              m_maxicount;    /* maximum inode count */
 374         __uint64_t              m_maxioffset;   /* maximum inode offset */
 375         __uint64_t              m_resblks;      /* total reserved blocks */
 376         __uint64_t              m_resblks_avail;/* available reserved blocks */
 377 #if XFS_BIG_INUMS
 378         xfs_ino_t               m_inoadd;       /* add value for ino64_offset */
 379 #endif
 380         int                     m_dalign;       /* stripe unit */
 381         int                     m_swidth;       /* stripe width */
 382         int                     m_sinoalign;    /* stripe unit inode alignment */
 383         int                     m_attr_magicpct;/* 37% of the blocksize */
 384         int                     m_dir_magicpct; /* 37% of the dir blocksize */
 385         __uint8_t               m_mk_sharedro;  /* mark shared ro on unmount */
 386         __uint8_t               m_inode_quiesce;/* call quiesce on new inodes.
 387                                                    field governed by m_ilock */
 388         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 389         __uint8_t               m_dirversion;   /* 1 or 2 */
 390         xfs_dirops_t            m_dirops;       /* table of dir funcs */
 391         int                     m_dirblksize;   /* directory block sz--bytes */
 392         int                     m_dirblkfsbs;   /* directory block sz--fsbs */
 393         xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */
 394         xfs_dablk_t             m_dirleafblk;   /* blockno of dir non-data v2 */
 395         xfs_dablk_t             m_dirfreeblk;   /* blockno of dirfreeindex v2 */
 396         uint                    m_chsize;       /* size of next field */
 397         struct xfs_chash        *m_chash;       /* fs private inode per-cluster
 398                                                  * hash table */
 399         struct xfs_dmops        m_dm_ops;       /* vector of DMI ops */
 400         struct xfs_qmops        m_qm_ops;       /* vector of XQM ops */
 401         struct xfs_ioops        m_io_ops;       /* vector of I/O ops */
 402         atomic_t                m_active_trans; /* number trans frozen */
 403 #ifdef HAVE_PERCPU_SB
 404         xfs_icsb_cnts_t         *m_sb_cnts;     /* per-cpu superblock counters */
 405         unsigned long           m_icsb_counters; /* disabled per-cpu counters */
 406         struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
 407 #endif
 408 } xfs_mount_t;
 409
 410 /*
 411  * Flags for m_flags.
 412  */
 413 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 414                                                    must be synchronous except
 415                                                    for space allocations */
 416 #define XFS_MOUNT_INO64         (1ULL << 1)
 417                              /* (1ULL << 2)     -- currently unused */
 418                              /* (1ULL << 3)     -- currently unused */
 419 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 420                                                    operations, typically for
 421                                                    disk errors in metadata */
 422 #define XFS_MOUNT_RETERR        (1ULL << 6)     /* return alignment errors to
 423                                                    user */
 424 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 425                                                    allocations */
 426 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 427                              /* (1ULL << 9)     -- currently unused */
 428 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 429 #define XFS_MOUNT_SHARED        (1ULL << 11)    /* shared mount */
 430 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 431 #define XFS_MOUNT_OSYNCISOSYNC  (1ULL << 13)    /* o_sync is REALLY o_sync */
 432                                                 /* osyncisdsync is now default*/
 433 #define XFS_MOUNT_32BITINODES   (1ULL << 14)    /* do not create inodes above
 434                                                  * 32 bits in size */
 435                              /* (1ULL << 15)    -- currently unused */
 436 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 437 #define XFS_MOUNT_BARRIER       (1ULL << 17)
 438 #define XFS_MOUNT_IDELETE       (1ULL << 18)    /* delete empty inode clusters*/
 439 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 440                                                  * allocation */
 441 #define XFS_MOUNT_IHASHSIZE     (1ULL << 20)    /* inode hash table size */
 442 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 443 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 444                                                  * I/O size in stat() */
 445 #define XFS_MOUNT_NO_PERCPU_SB  (1ULL << 23)    /* don't use per-cpu superblock
 446                                                    counters */
 447
 448
 449 /*
 450  * Default minimum read and write sizes.
 451  */
 452 #define XFS_READIO_LOG_LARGE    16
 453 #define XFS_WRITEIO_LOG_LARGE   16
 454
 455 /*
 456  * Max and min values for mount-option defined I/O
 457  * preallocation sizes.
 458  */
 459 #define XFS_MAX_IO_LOG          30      /* 1G */
 460 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 461
 462 /*
 463  * Synchronous read and write sizes.  This should be
 464  * better for NFSv2 wsync filesystems.
 465  */
 466 #define XFS_WSYNC_READIO_LOG    15      /* 32K */
 467 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16K */
 468
 469 /*
 470  * Allow large block sizes to be reported to userspace programs if the
 471  * "largeio" mount option is used.
 472  *
 473  * If compatibility mode is specified, simply return the basic unit of caching
 474  * so that we don't get inefficient read/modify/write I/O from user apps.
 475  * Otherwise....
 476  *
 477  * If the underlying volume is a stripe, then return the stripe width in bytes
 478  * as the recommended I/O size. It is not a stripe and we've set a default
 479  * buffered I/O size, return that, otherwise return the compat default.
 480  */
 481 static inline unsigned long
 482 xfs_preferred_iosize(xfs_mount_t *mp)
 483 {
 484         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 485                 return PAGE_CACHE_SIZE;
 486         return (mp->m_swidth ?
 487                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 488                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 489                         (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 490                         PAGE_CACHE_SIZE));
 491 }
 492
 493 #define XFS_MAXIOFFSET(mp)      ((mp)->m_maxioffset)
 494
 495 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 496 #define xfs_force_shutdown(m,f) \
 497         VFS_FORCE_SHUTDOWN((XFS_MTOVFS(m)), f, __FILE__, __LINE__)
 498
 499 /*
 500  * Flags sent to xfs_force_shutdown.
 501  */
 502 #define XFS_METADATA_IO_ERROR   0x1
 503 #define XFS_LOG_IO_ERROR        0x2
 504 #define XFS_FORCE_UMOUNT        0x4
 505 #define XFS_CORRUPT_INCORE      0x8     /* Corrupt in-memory data structures */
 506 #define XFS_SHUTDOWN_REMOTE_REQ 0x10    /* Shutdown came from remote cell */
 507
 508 /*
 509  * Flags for xfs_mountfs
 510  */
 511 #define XFS_MFSI_SECOND         0x01    /* Secondary mount -- skip stuff */
 512 #define XFS_MFSI_CLIENT         0x02    /* Is a client -- skip lots of stuff */
 513 /*      XFS_MFSI_RRINODES       */
 514 #define XFS_MFSI_NOUNLINK       0x08    /* Skip unlinked inode processing in */
 515                                         /* log recovery */
 516 #define XFS_MFSI_NO_QUOTACHECK  0x10    /* Skip quotacheck processing */
 517 /*      XFS_MFSI_CONVERT_SUNIT  */
 518 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 519
 520 /*
 521  * Macros for getting from mount to vfs and back.
 522  */
 523 #define XFS_MTOVFS(mp)          xfs_mtovfs(mp)
 524 static inline struct vfs *xfs_mtovfs(xfs_mount_t *mp)
 525 {
 526         return bhvtovfs(&mp->m_bhv);
 527 }
 528
 529 #define XFS_BHVTOM(bdp) xfs_bhvtom(bdp)
 530 static inline xfs_mount_t *xfs_bhvtom(bhv_desc_t *bdp)
 531 {
 532         return (xfs_mount_t *)BHV_PDATA(bdp);
 533 }
 534
 535 #define XFS_VFSTOM(vfs) xfs_vfstom(vfs)
 536 static inline xfs_mount_t *xfs_vfstom(vfs_t *vfs)
 537 {
 538         return XFS_BHVTOM(bhv_lookup(VFS_BHVHEAD(vfs), &xfs_vfsops));
 539 }
 540
 541 #define XFS_DADDR_TO_AGNO(mp,d)         xfs_daddr_to_agno(mp,d)
 542 static inline xfs_agnumber_t
 543 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 544 {
 545         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 546         do_div(ld, mp->m_sb.sb_agblocks);
 547         return (xfs_agnumber_t) ld;
 548 }
 549
 550 #define XFS_DADDR_TO_AGBNO(mp,d)        xfs_daddr_to_agbno(mp,d)
 551 static inline xfs_agblock_t
 552 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 553 {
 554         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 555         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 556 }
 557
 558 /*
 559  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
 560  */
 561 typedef struct xfs_mod_sb {
 562         xfs_sb_field_t  msb_field;      /* Field to modify, see below */
 563         int             msb_delta;      /* Change to make to specified field */
 564 } xfs_mod_sb_t;
 565
 566 #define XFS_MOUNT_ILOCK(mp)     mutex_lock(&((mp)->m_ilock))
 567 #define XFS_MOUNT_IUNLOCK(mp)   mutex_unlock(&((mp)->m_ilock))
 568 #define XFS_SB_LOCK(mp)         mutex_spinlock(&(mp)->m_sb_lock)
 569 #define XFS_SB_UNLOCK(mp,s)     mutex_spinunlock(&(mp)->m_sb_lock,(s))
 570
 571 extern xfs_mount_t *xfs_mount_init(void);
 572 extern void     xfs_mod_sb(xfs_trans_t *, __int64_t);
 573 extern void     xfs_mount_free(xfs_mount_t *mp, int remove_bhv);
 574 extern int      xfs_mountfs(struct vfs *, xfs_mount_t *mp, int);
 575 extern void     xfs_mountfs_check_barriers(xfs_mount_t *mp);
 576
 577 extern int      xfs_unmountfs(xfs_mount_t *, struct cred *);
 578 extern void     xfs_unmountfs_close(xfs_mount_t *, struct cred *);
 579 extern int      xfs_unmountfs_writesb(xfs_mount_t *);
 580 extern int      xfs_unmount_flush(xfs_mount_t *, int);
 581 extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int, int);
 582 extern int      xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t,
 583                         int, int);
 584 extern int      xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 585                         uint, int);
 586 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 587 extern int      xfs_readsb(xfs_mount_t *, int);
 588 extern void     xfs_freesb(xfs_mount_t *);
 589 extern void     xfs_do_force_shutdown(bhv_desc_t *, int, char *, int);
 590 extern int      xfs_syncsub(xfs_mount_t *, int, int, int *);
 591 extern int      xfs_sync_inodes(xfs_mount_t *, int, int, int *);
 592 extern xfs_agnumber_t   xfs_initialize_perag(struct vfs *, xfs_mount_t *,
 593                                                 xfs_agnumber_t);
 594 extern void     xfs_xlatesb(void *, struct xfs_sb *, int, __int64_t);
 595
 596 extern struct xfs_dmops xfs_dmcore_stub;
 597 extern struct xfs_qmops xfs_qmcore_stub;
 598 extern struct xfs_ioops xfs_iocore_xfs;
 599
 600 extern int      xfs_init(void);
 601 extern void     xfs_cleanup(void);
 602
 603 #endif  /* __KERNEL__ */
 604
 605 #endif  /* __XFS_MOUNT_H__ */