linux/fs/xfs/xfs_mount.h
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   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
  21typedef 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#include "xfs_sync.h"
  55
  56struct xlog;
  57struct xfs_inode;
  58struct xfs_mru_cache;
  59struct xfs_nameops;
  60struct xfs_ail;
  61struct xfs_quotainfo;
  62
  63#ifdef HAVE_PERCPU_SB
  64
  65/*
  66 * Valid per-cpu incore superblock counters. Note that if you add new counters,
  67 * you may need to define new counter disabled bit field descriptors as there
  68 * are more possible fields in the superblock that can fit in a bitfield on a
  69 * 32 bit platform. The XFS_SBS_* values for the current current counters just
  70 * fit.
  71 */
  72typedef struct xfs_icsb_cnts {
  73        uint64_t        icsb_fdblocks;
  74        uint64_t        icsb_ifree;
  75        uint64_t        icsb_icount;
  76        unsigned long   icsb_flags;
  77} xfs_icsb_cnts_t;
  78
  79#define XFS_ICSB_FLAG_LOCK      (1 << 0)        /* counter lock bit */
  80
  81#define XFS_ICSB_LAZY_COUNT     (1 << 1)        /* accuracy not needed */
  82
  83extern int      xfs_icsb_init_counters(struct xfs_mount *);
  84extern void     xfs_icsb_reinit_counters(struct xfs_mount *);
  85extern void     xfs_icsb_destroy_counters(struct xfs_mount *);
  86extern void     xfs_icsb_sync_counters(struct xfs_mount *, int);
  87extern void     xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
  88extern int      xfs_icsb_modify_counters(struct xfs_mount *, xfs_sb_field_t,
  89                                                int64_t, int);
  90
  91#else
  92#define xfs_icsb_init_counters(mp)              (0)
  93#define xfs_icsb_destroy_counters(mp)           do { } while (0)
  94#define xfs_icsb_reinit_counters(mp)            do { } while (0)
  95#define xfs_icsb_sync_counters(mp, flags)       do { } while (0)
  96#define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
  97#define xfs_icsb_modify_counters(mp, field, delta, rsvd) \
  98        xfs_mod_incore_sb(mp, field, delta, rsvd)
  99#endif
 100
 101/* dynamic preallocation free space thresholds, 5% down to 1% */
 102enum {
 103        XFS_LOWSP_1_PCNT = 0,
 104        XFS_LOWSP_2_PCNT,
 105        XFS_LOWSP_3_PCNT,
 106        XFS_LOWSP_4_PCNT,
 107        XFS_LOWSP_5_PCNT,
 108        XFS_LOWSP_MAX,
 109};
 110
 111typedef struct xfs_mount {
 112        struct super_block      *m_super;
 113        xfs_tid_t               m_tid;          /* next unused tid for fs */
 114        struct xfs_ail          *m_ail;         /* fs active log item list */
 115        xfs_sb_t                m_sb;           /* copy of fs superblock */
 116        spinlock_t              m_sb_lock;      /* sb counter lock */
 117        struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
 118        char                    *m_fsname;      /* filesystem name */
 119        int                     m_fsname_len;   /* strlen of fs name */
 120        char                    *m_rtname;      /* realtime device name */
 121        char                    *m_logname;     /* external log device name */
 122        int                     m_bsize;        /* fs logical block size */
 123        xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
 124        xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
 125        spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
 126        xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
 127        uint                    m_readio_log;   /* min read size log bytes */
 128        uint                    m_readio_blocks; /* min read size blocks */
 129        uint                    m_writeio_log;  /* min write size log bytes */
 130        uint                    m_writeio_blocks; /* min write size blocks */
 131        struct xlog             *m_log;         /* log specific stuff */
 132        int                     m_logbufs;      /* number of log buffers */
 133        int                     m_logbsize;     /* size of each log buffer */
 134        uint                    m_rsumlevels;   /* rt summary levels */
 135        uint                    m_rsumsize;     /* size of rt summary, bytes */
 136        struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 137        struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 138        struct xfs_inode        *m_rootip;      /* pointer to root directory */
 139        struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 140        xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 141        xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 142        xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 143        __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
 144        __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
 145        __uint8_t               m_agno_log;     /* log #ag's */
 146        __uint8_t               m_agino_log;    /* #bits for agino in inum */
 147        __uint16_t              m_inode_cluster_size;/* min inode buf size */
 148        uint                    m_blockmask;    /* sb_blocksize-1 */
 149        uint                    m_blockwsize;   /* sb_blocksize in words */
 150        uint                    m_blockwmask;   /* blockwsize-1 */
 151        uint                    m_alloc_mxr[2]; /* max alloc btree records */
 152        uint                    m_alloc_mnr[2]; /* min alloc btree records */
 153        uint                    m_bmap_dmxr[2]; /* max bmap btree records */
 154        uint                    m_bmap_dmnr[2]; /* min bmap btree records */
 155        uint                    m_inobt_mxr[2]; /* max inobt btree records */
 156        uint                    m_inobt_mnr[2]; /* min inobt btree records */
 157        uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 158        uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 159        uint                    m_in_maxlevels; /* max inobt btree levels. */
 160        struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
 161        spinlock_t              m_perag_lock;   /* lock for m_perag_tree */
 162        struct mutex            m_growlock;     /* growfs mutex */
 163        int                     m_fixedfsid[2]; /* unchanged for life of FS */
 164        uint                    m_dmevmask;     /* DMI events for this FS */
 165        __uint64_t              m_flags;        /* global mount flags */
 166        uint                    m_dir_node_ents; /* #entries in a dir danode */
 167        uint                    m_attr_node_ents; /* #entries in attr danode */
 168        int                     m_ialloc_inos;  /* inodes in inode allocation */
 169        int                     m_ialloc_blks;  /* blocks in inode allocation */
 170        int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 171        uint                    m_qflags;       /* quota status flags */
 172        xfs_trans_reservations_t m_reservations;/* precomputed res values */
 173        __uint64_t              m_maxicount;    /* maximum inode count */
 174        __uint64_t              m_resblks;      /* total reserved blocks */
 175        __uint64_t              m_resblks_avail;/* available reserved blocks */
 176        __uint64_t              m_resblks_save; /* reserved blks @ remount,ro */
 177        int                     m_dalign;       /* stripe unit */
 178        int                     m_swidth;       /* stripe width */
 179        int                     m_sinoalign;    /* stripe unit inode alignment */
 180        int                     m_attr_magicpct;/* 37% of the blocksize */
 181        int                     m_dir_magicpct; /* 37% of the dir blocksize */
 182        __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 183        const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
 184        int                     m_dirblksize;   /* directory block sz--bytes */
 185        int                     m_dirblkfsbs;   /* directory block sz--fsbs */
 186        xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */
 187        xfs_dablk_t             m_dirleafblk;   /* blockno of dir non-data v2 */
 188        xfs_dablk_t             m_dirfreeblk;   /* blockno of dirfreeindex v2 */
 189        uint                    m_chsize;       /* size of next field */
 190        struct xfs_chash        *m_chash;       /* fs private inode per-cluster
 191                                                 * hash table */
 192        atomic_t                m_active_trans; /* number trans frozen */
 193#ifdef HAVE_PERCPU_SB
 194        xfs_icsb_cnts_t __percpu *m_sb_cnts;    /* per-cpu superblock counters */
 195        unsigned long           m_icsb_counters; /* disabled per-cpu counters */
 196        struct notifier_block   m_icsb_notifier; /* hotplug cpu notifier */
 197        struct mutex            m_icsb_mutex;   /* balancer sync lock */
 198#endif
 199        struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 200        struct delayed_work     m_sync_work;    /* background sync work */
 201        struct delayed_work     m_reclaim_work; /* background inode reclaim */
 202        struct work_struct      m_flush_work;   /* background inode flush */
 203        __int64_t               m_update_flags; /* sb flags we need to update
 204                                                   on the next remount,rw */
 205        struct shrinker         m_inode_shrink; /* inode reclaim shrinker */
 206        int64_t                 m_low_space[XFS_LOWSP_MAX];
 207                                                /* low free space thresholds */
 208
 209        struct workqueue_struct *m_data_workqueue;
 210        struct workqueue_struct *m_unwritten_workqueue;
 211        struct workqueue_struct *m_cil_workqueue;
 212} xfs_mount_t;
 213
 214/*
 215 * Flags for m_flags.
 216 */
 217#define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 218                                                   must be synchronous except
 219                                                   for space allocations */
 220#define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 221#define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 222                                                   operations, typically for
 223                                                   disk errors in metadata */
 224#define XFS_MOUNT_DISCARD       (1ULL << 5)     /* discard unused blocks */
 225#define XFS_MOUNT_RETERR        (1ULL << 6)     /* return alignment errors to
 226                                                   user */
 227#define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 228                                                   allocations */
 229#define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 230#define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 231#define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 232#define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 233#define XFS_MOUNT_32BITINODES   (1ULL << 14)    /* do not create inodes above
 234                                                 * 32 bits in size */
 235#define XFS_MOUNT_SMALL_INUMS   (1ULL << 15)    /* users wants 32bit inodes */
 236#define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 237#define XFS_MOUNT_BARRIER       (1ULL << 17)
 238#define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 239#define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 240                                                 * allocation */
 241#define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 242#define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 243#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 244                                                 * I/O size in stat() */
 245#define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 246                                                   allocator */
 247#define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 248
 249
 250/*
 251 * Default minimum read and write sizes.
 252 */
 253#define XFS_READIO_LOG_LARGE    16
 254#define XFS_WRITEIO_LOG_LARGE   16
 255
 256/*
 257 * Max and min values for mount-option defined I/O
 258 * preallocation sizes.
 259 */
 260#define XFS_MAX_IO_LOG          30      /* 1G */
 261#define XFS_MIN_IO_LOG          PAGE_SHIFT
 262
 263/*
 264 * Synchronous read and write sizes.  This should be
 265 * better for NFSv2 wsync filesystems.
 266 */
 267#define XFS_WSYNC_READIO_LOG    15      /* 32k */
 268#define XFS_WSYNC_WRITEIO_LOG   14      /* 16k */
 269
 270/*
 271 * Allow large block sizes to be reported to userspace programs if the
 272 * "largeio" mount option is used.
 273 *
 274 * If compatibility mode is specified, simply return the basic unit of caching
 275 * so that we don't get inefficient read/modify/write I/O from user apps.
 276 * Otherwise....
 277 *
 278 * If the underlying volume is a stripe, then return the stripe width in bytes
 279 * as the recommended I/O size. It is not a stripe and we've set a default
 280 * buffered I/O size, return that, otherwise return the compat default.
 281 */
 282static inline unsigned long
 283xfs_preferred_iosize(xfs_mount_t *mp)
 284{
 285        if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 286                return PAGE_CACHE_SIZE;
 287        return (mp->m_swidth ?
 288                (mp->m_swidth << mp->m_sb.sb_blocklog) :
 289                ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 290                        (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 291                        PAGE_CACHE_SIZE));
 292}
 293
 294#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 295                                ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 296#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 297void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 298                int lnnum);
 299#define xfs_force_shutdown(m,f) \
 300        xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 301
 302#define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 303#define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 304#define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 305#define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 306#define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 307#define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 308
 309/*
 310 * Flags for xfs_mountfs
 311 */
 312#define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 313
 314static inline xfs_agnumber_t
 315xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 316{
 317        xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 318        do_div(ld, mp->m_sb.sb_agblocks);
 319        return (xfs_agnumber_t) ld;
 320}
 321
 322static inline xfs_agblock_t
 323xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 324{
 325        xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 326        return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 327}
 328
 329/*
 330 * perag get/put wrappers for ref counting
 331 */
 332struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
 333struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
 334                                        int tag);
 335void    xfs_perag_put(struct xfs_perag *pag);
 336
 337/*
 338 * Per-cpu superblock locking functions
 339 */
 340#ifdef HAVE_PERCPU_SB
 341static inline void
 342xfs_icsb_lock(xfs_mount_t *mp)
 343{
 344        mutex_lock(&mp->m_icsb_mutex);
 345}
 346
 347static inline void
 348xfs_icsb_unlock(xfs_mount_t *mp)
 349{
 350        mutex_unlock(&mp->m_icsb_mutex);
 351}
 352#else
 353#define xfs_icsb_lock(mp)
 354#define xfs_icsb_unlock(mp)
 355#endif
 356
 357/*
 358 * This structure is for use by the xfs_mod_incore_sb_batch() routine.
 359 * xfs_growfs can specify a few fields which are more than int limit
 360 */
 361typedef struct xfs_mod_sb {
 362        xfs_sb_field_t  msb_field;      /* Field to modify, see below */
 363        int64_t         msb_delta;      /* Change to make to specified field */
 364} xfs_mod_sb_t;
 365
 366extern int      xfs_log_sbcount(xfs_mount_t *);
 367extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
 368extern int      xfs_mountfs(xfs_mount_t *mp);
 369
 370extern void     xfs_unmountfs(xfs_mount_t *);
 371extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
 372extern int      xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
 373                        uint, int);
 374extern int      xfs_mount_log_sb(xfs_mount_t *, __int64_t);
 375extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 376extern int      xfs_readsb(xfs_mount_t *, int);
 377extern void     xfs_freesb(xfs_mount_t *);
 378extern int      xfs_fs_writable(xfs_mount_t *);
 379extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 380
 381extern int      xfs_dev_is_read_only(struct xfs_mount *, char *);
 382
 383extern void     xfs_set_low_space_thresholds(struct xfs_mount *);
 384
 385#endif  /* __KERNEL__ */
 386
 387extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
 388extern int      xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
 389                                        xfs_agnumber_t *);
 390extern void     xfs_sb_from_disk(struct xfs_mount *, struct xfs_dsb *);
 391extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
 392
 393#endif  /* __XFS_MOUNT_H__ */
 394
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