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 #define xfs_daddr_to_agno(mp,d) \
  48         ((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
  49 #define xfs_daddr_to_agbno(mp,d) \
  50         ((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))
  51
  52 #else /* __KERNEL__ */
  53
  54 struct xlog;
  55 struct xfs_inode;
  56 struct xfs_mru_cache;
  57 struct xfs_nameops;
  58 struct xfs_ail;
  59 struct xfs_quotainfo;
  60
  61 #ifdef HAVE_PERCPU_SB
  62
  63 /*
  64  * Valid per-cpu incore superblock counters. Note that if you add new counters,
  65  * you may need to define new counter disabled bit field descriptors as there
  66  * are more possible fields in the superblock that can fit in a bitfield on a
  67  * 32 bit platform. The XFS_SBS_* values for the current current counters just
  68  * fit.
  69  */
  70 typedef struct xfs_icsb_cnts {
  71         uint64_t        icsb_fdblocks;
  72         uint64_t        icsb_ifree;
  73         uint64_t        icsb_icount;
  74         unsigned long   icsb_flags;
  75 } xfs_icsb_cnts_t;
  76
  77 #define XFS_ICSB_FLAG_LOCK      (1 << 0)        /* counter lock bit */
  78
  79 #define XFS_ICSB_LAZY_COUNT     (1 << 1)        /* accuracy not needed */
  80
  81 extern int      xfs_icsb_init_counters(struct xfs_mount *);
  82 extern void     xfs_icsb_reinit_counters(struct xfs_mount *);
  83 extern void     xfs_icsb_destroy_counters(struct xfs_mount *);
  84 extern void     xfs_icsb_sync_counters(struct xfs_mount *, int);
  85 extern void     xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
  86 extern int      xfs_icsb_modify_counters(struct xfs_mount *, xfs_sb_field_t,
  87                                                 int64_t, int);
  88
  89 #else
  90 #define xfs_icsb_init_counters(mp)              (0)
  91 #define xfs_icsb_destroy_counters(mp)           do { } while (0)
  92 #define xfs_icsb_reinit_counters(mp)            do { } while (0)
  93 #define xfs_icsb_sync_counters(mp, flags)       do { } while (0)
  94 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
  95 #define xfs_icsb_modify_counters(mp, field, delta, rsvd) \
  96         xfs_mod_incore_sb(mp, field, delta, rsvd)
  97 #endif
  98
  99 /* dynamic preallocation free space thresholds, 5% down to 1% */
 100 enum {
 101         XFS_LOWSP_1_PCNT = 0,
 102         XFS_LOWSP_2_PCNT,
 103         XFS_LOWSP_3_PCNT,
 104         XFS_LOWSP_4_PCNT,
 105         XFS_LOWSP_5_PCNT,
 106         XFS_LOWSP_MAX,
 107 };
 108
 109 typedef struct xfs_mount {
 110         struct super_block      *m_super;
 111         xfs_tid_t               m_tid;          /* next unused tid for fs */
 112         struct xfs_ail          *m_ail;         /* fs active log item list */
 113         xfs_sb_t                m_sb;           /* copy of fs superblock */
 114         spinlock_t              m_sb_lock;      /* sb counter lock */
 115         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
 116         char                    *m_fsname;      /* filesystem name */
 117         int                     m_fsname_len;   /* strlen of fs name */
 118         char                    *m_rtname;      /* realtime device name */
 119         char                    *m_logname;     /* external log device name */
 120         int                     m_bsize;        /* fs logical block size */
 121         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
 122         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
 123         spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
 124         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
 125         uint                    m_readio_log;   /* min read size log bytes */
 126         uint                    m_readio_blocks; /* min read size blocks */
 127         uint                    m_writeio_log;  /* min write size log bytes */
 128         uint                    m_writeio_blocks; /* min write size blocks */
 129         struct xlog             *m_log;         /* log specific stuff */
 130         int                     m_logbufs;      /* number of log buffers */
 131         int                     m_logbsize;     /* size of each log buffer */
 132         uint                    m_rsumlevels;   /* rt summary levels */
 133         uint                    m_rsumsize;     /* size of rt summary, bytes */
 134         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 135         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 136         struct xfs_inode        *m_rootip;      /* pointer to root directory */
 137         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 138         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 139         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 140         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 141         __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
 142         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
 143         __uint8_t               m_agno_log;     /* log #ag's */
 144         __uint8_t               m_agino_log;    /* #bits for agino in inum */
 145         __uint16_t              m_inode_cluster_size;/* min inode buf size */
 146         uint                    m_blockmask;    /* sb_blocksize-1 */
 147         uint                    m_blockwsize;   /* sb_blocksize in words */
 148         uint                    m_blockwmask;   /* blockwsize-1 */
 149         uint                    m_alloc_mxr[2]; /* max alloc btree records */
 150         uint                    m_alloc_mnr[2]; /* min alloc btree records */
 151         uint                    m_bmap_dmxr[2]; /* max bmap btree records */
 152         uint                    m_bmap_dmnr[2]; /* min bmap btree records */
 153         uint                    m_inobt_mxr[2]; /* max inobt btree records */
 154         uint                    m_inobt_mnr[2]; /* min inobt btree records */
 155         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 156         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 157         uint                    m_in_maxlevels; /* max inobt btree levels. */
 158         struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
 159         spinlock_t              m_perag_lock;   /* lock for m_perag_tree */
 160         struct mutex            m_growlock;     /* growfs mutex */
 161         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 162         uint                    m_dmevmask;     /* DMI events for this FS */
 163         __uint64_t              m_flags;        /* global mount flags */
 164         uint                    m_dir_node_ents; /* #entries in a dir danode */
 165         uint                    m_attr_node_ents; /* #entries in attr danode */
 166         int                     m_ialloc_inos;  /* inodes in inode allocation */
 167         int                     m_ialloc_blks;  /* blocks in inode allocation */
 168         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 169         uint                    m_qflags;       /* quota status flags */
 170         xfs_trans_reservations_t m_reservations;/* precomputed res values */
 171         __uint64_t              m_maxicount;    /* maximum inode count */
 172         __uint64_t              m_resblks;      /* total reserved blocks */
 173         __uint64_t              m_resblks_avail;/* available reserved blocks */
 174         __uint64_t              m_resblks_save; /* reserved blks @ remount,ro */
 175         int                     m_dalign;       /* stripe unit */
 176         int                     m_swidth;       /* stripe width */
 177         int                     m_sinoalign;    /* stripe unit inode alignment */
 178         int                     m_attr_magicpct;/* 37% of the blocksize */
 179         int                     m_dir_magicpct; /* 37% of the dir blocksize */
 180         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 181         const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
 182         int                     m_dirblksize;   /* directory block sz--bytes */
 183         int                     m_dirblkfsbs;   /* directory block sz--fsbs */
 184         xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */
 185         xfs_dablk_t             m_dirleafblk;   /* blockno of dir non-data v2 */
 186         xfs_dablk_t             m_dirfreeblk;   /* blockno of dirfreeindex v2 */
 187         uint                    m_chsize;       /* size of next field */
 188         struct xfs_chash        *m_chash;       /* fs private inode per-cluster
 189                                                  * hash table */
 190         atomic_t                m_active_trans; /* number trans frozen */
 191 #ifdef HAVE_PERCPU_SB
 192         xfs_icsb_cnts_t __percpu *m_sb_cnts;    /* per-cpu superblock counters */
 193         unsigned long           m_icsb_counters; /* disabled per-cpu counters */
 194         struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
 195         struct mutex            m_icsb_mutex;   /* balancer sync lock */
 196 #endif
 197         struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 198         struct delayed_work     m_reclaim_work; /* background inode reclaim */
 199         __int64_t               m_update_flags; /* sb flags we need to update
 200                                                    on the next remount,rw */
 201         struct shrinker         m_inode_shrink; /* inode reclaim shrinker */
 202         int64_t                 m_low_space[XFS_LOWSP_MAX];
 203                                                 /* low free space thresholds */
 204
 205         struct workqueue_struct *m_data_workqueue;
 206         struct workqueue_struct *m_unwritten_workqueue;
 207         struct workqueue_struct *m_cil_workqueue;
 208         struct workqueue_struct *m_reclaim_workqueue;
 209         struct workqueue_struct *m_log_workqueue;
 210 } xfs_mount_t;
 211
 212 /*
 213  * Flags for m_flags.
 214  */
 215 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 216                                                    must be synchronous except
 217                                                    for space allocations */
 218 #define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 219 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 220                                                    operations, typically for
 221                                                    disk errors in metadata */
 222 #define XFS_MOUNT_DISCARD       (1ULL << 5)     /* discard unused blocks */
 223 #define XFS_MOUNT_RETERR        (1ULL << 6)     /* return alignment errors to
 224                                                    user */
 225 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 226                                                    allocations */
 227 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 228 #define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 229 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 230 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 231 #define XFS_MOUNT_32BITINODES   (1ULL << 14)    /* do not create inodes above
 232                                                  * 32 bits in size */
 233 #define XFS_MOUNT_SMALL_INUMS   (1ULL << 15)    /* users wants 32bit inodes */
 234 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 235 #define XFS_MOUNT_BARRIER       (1ULL << 17)
 236 #define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 237 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 238                                                  * allocation */
 239 #define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 240 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 241 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 242                                                  * I/O size in stat() */
 243 #define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 244                                                    allocator */
 245 #define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 246
 247
 248 /*
 249  * Default minimum read and write sizes.
 250  */
 251 #define XFS_READIO_LOG_LARGE    16
 252 #define XFS_WRITEIO_LOG_LARGE   16
 253
 254 /*
 255  * Max and min values for mount-option defined I/O
 256  * preallocation sizes.
 257  */
 258 #define XFS_MAX_IO_LOG          30      /* 1G */
 259 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 260
 261 /*
 262  * Synchronous read and write sizes.  This should be
 263  * better for NFSv2 wsync filesystems.
 264  */
 265 #define XFS_WSYNC_READIO_LOG    15      /* 32k */
 266 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16k */
 267
 268 /*
 269  * Allow large block sizes to be reported to userspace programs if the
 270  * "largeio" mount option is used.
 271  *
 272  * If compatibility mode is specified, simply return the basic unit of caching
 273  * so that we don't get inefficient read/modify/write I/O from user apps.
 274  * Otherwise....
 275  *
 276  * If the underlying volume is a stripe, then return the stripe width in bytes
 277  * as the recommended I/O size. It is not a stripe and we've set a default
 278  * buffered I/O size, return that, otherwise return the compat default.
 279  */
 280 static inline unsigned long
 281 xfs_preferred_iosize(xfs_mount_t *mp)
 282 {
 283         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 284                 return PAGE_CACHE_SIZE;
 285         return (mp->m_swidth ?
 286                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 287                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 288                         (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 289                         PAGE_CACHE_SIZE));
 290 }
 291
 292 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 293                                 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 294 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 295 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 296                 int lnnum);
 297 #define xfs_force_shutdown(m,f) \
 298         xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 299
 300 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 301 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 302 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 303 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 304 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 305 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 306
 307 /*
 308  * Flags for xfs_mountfs
 309  */
 310 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 311
 312 static inline xfs_agnumber_t
 313 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 314 {
 315         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 316         do_div(ld, mp->m_sb.sb_agblocks);
 317         return (xfs_agnumber_t) ld;
 318 }
 319
 320 static inline xfs_agblock_t
 321 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 322 {
 323         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 324         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 325 }
 326
 327 /*
 328  * perag get/put wrappers for ref counting
 329  */
 330 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
 331 struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
 332                                         int tag);
 333 void    xfs_perag_put(struct xfs_perag *pag);
 334
 335 /*
 336  * Per-cpu superblock locking functions
 337  */
 338 #ifdef HAVE_PERCPU_SB
 339 static inline void
 340 xfs_icsb_lock(xfs_mount_t *mp)
 341 {
 342         mutex_lock(&mp->m_icsb_mutex);
 343 }
 344
 345 static inline void
 346 xfs_icsb_unlock(xfs_mount_t *mp)
 347 {
 348         mutex_unlock(&mp->m_icsb_mutex);
 349 }
 350 #else
 351 #define xfs_icsb_lock(mp)
 352 #define xfs_icsb_unlock(mp)
 353 #endif
 354
 355 /*
 356  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
 357  * xfs_growfs can specify a few fields which are more than int limit
 358  */
 359 typedef struct xfs_mod_sb {
 360         xfs_sb_field_t  msb_field;      /* Field to modify, see below */
 361         int64_t         msb_delta;      /* Change to make to specified field */
 362 } xfs_mod_sb_t;
 363
 364 extern int      xfs_log_sbcount(xfs_mount_t *);
 365 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
 366 extern int      xfs_mountfs(xfs_mount_t *mp);
 367
 368 extern void     xfs_unmountfs(xfs_mount_t *);
 369 extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
 370 extern int      xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 371                         uint, int);
 372 extern int      xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 373 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 374 extern int      xfs_readsb(xfs_mount_t *, int);
 375 extern void     xfs_freesb(xfs_mount_t *);
 376 extern int      xfs_fs_writable(xfs_mount_t *);
 377 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 378
 379 extern int      xfs_dev_is_read_only(struct xfs_mount *, char *);
 380
 381 extern void     xfs_set_low_space_thresholds(struct xfs_mount *);
 382
 383 #endif  /* __KERNEL__ */
 384
 385 extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
 386 extern int      xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
 387                                         xfs_agnumber_t *);
 388 extern void     xfs_sb_from_disk(struct xfs_mount *, struct xfs_dsb *);
 389 extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 390
 391 #endif  /* __XFS_MOUNT_H__ */