fs/xfs/xfs_mount.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_MOUNT_H__
   7 #define __XFS_MOUNT_H__
   8
   9 struct xlog;
  10 struct xfs_inode;
  11 struct xfs_mru_cache;
  12 struct xfs_nameops;
  13 struct xfs_ail;
  14 struct xfs_quotainfo;
  15 struct xfs_dir_ops;
  16 struct xfs_da_geometry;
  17
  18 /* dynamic preallocation free space thresholds, 5% down to 1% */
  19 enum {
  20         XFS_LOWSP_1_PCNT = 0,
  21         XFS_LOWSP_2_PCNT,
  22         XFS_LOWSP_3_PCNT,
  23         XFS_LOWSP_4_PCNT,
  24         XFS_LOWSP_5_PCNT,
  25         XFS_LOWSP_MAX,
  26 };
  27
  28 /*
  29  * Error Configuration
  30  *
  31  * Error classes define the subsystem the configuration belongs to.
  32  * Error numbers define the errors that are configurable.
  33  */
  34 enum {
  35         XFS_ERR_METADATA,
  36         XFS_ERR_CLASS_MAX,
  37 };
  38 enum {
  39         XFS_ERR_DEFAULT,
  40         XFS_ERR_EIO,
  41         XFS_ERR_ENOSPC,
  42         XFS_ERR_ENODEV,
  43         XFS_ERR_ERRNO_MAX,
  44 };
  45
  46 #define XFS_ERR_RETRY_FOREVER   -1
  47
  48 /*
  49  * Although retry_timeout is in jiffies which is normally an unsigned long,
  50  * we limit the retry timeout to 86400 seconds, or one day.  So even a
  51  * signed 32-bit long is sufficient for a HZ value up to 24855.  Making it
  52  * signed lets us store the special "-1" value, meaning retry forever.
  53  */
  54 struct xfs_error_cfg {
  55         struct xfs_kobj kobj;
  56         int             max_retries;
  57         long            retry_timeout;  /* in jiffies, -1 = infinite */
  58 };
  59
  60 typedef struct xfs_mount {
  61         struct super_block      *m_super;
  62         xfs_tid_t               m_tid;          /* next unused tid for fs */
  63         struct xfs_ail          *m_ail;         /* fs active log item list */
  64
  65         struct xfs_sb           m_sb;           /* copy of fs superblock */
  66         spinlock_t              m_sb_lock;      /* sb counter lock */
  67         struct percpu_counter   m_icount;       /* allocated inodes counter */
  68         struct percpu_counter   m_ifree;        /* free inodes counter */
  69         struct percpu_counter   m_fdblocks;     /* free block counter */
  70
  71         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
  72         char                    *m_fsname;      /* filesystem name */
  73         int                     m_fsname_len;   /* strlen of fs name */
  74         char                    *m_rtname;      /* realtime device name */
  75         char                    *m_logname;     /* external log device name */
  76         int                     m_bsize;        /* fs logical block size */
  77         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
  78         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
  79         spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
  80         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
  81         uint                    m_readio_log;   /* min read size log bytes */
  82         uint                    m_readio_blocks; /* min read size blocks */
  83         uint                    m_writeio_log;  /* min write size log bytes */
  84         uint                    m_writeio_blocks; /* min write size blocks */
  85         struct xfs_da_geometry  *m_dir_geo;     /* directory block geometry */
  86         struct xfs_da_geometry  *m_attr_geo;    /* attribute block geometry */
  87         struct xlog             *m_log;         /* log specific stuff */
  88         int                     m_logbufs;      /* number of log buffers */
  89         int                     m_logbsize;     /* size of each log buffer */
  90         uint                    m_rsumlevels;   /* rt summary levels */
  91         uint                    m_rsumsize;     /* size of rt summary, bytes */
  92         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
  93         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
  94         struct xfs_inode        *m_rootip;      /* pointer to root directory */
  95         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
  96         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
  97         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
  98         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
  99         uint8_t                 m_blkbit_log;   /* blocklog + NBBY */
 100         uint8_t                 m_blkbb_log;    /* blocklog - BBSHIFT */
 101         uint8_t                 m_agno_log;     /* log #ag's */
 102         uint8_t                 m_agino_log;    /* #bits for agino in inum */
 103         uint                    m_inode_cluster_size;/* min inode buf size */
 104         uint                    m_blockmask;    /* sb_blocksize-1 */
 105         uint                    m_blockwsize;   /* sb_blocksize in words */
 106         uint                    m_blockwmask;   /* blockwsize-1 */
 107         uint                    m_alloc_mxr[2]; /* max alloc btree records */
 108         uint                    m_alloc_mnr[2]; /* min alloc btree records */
 109         uint                    m_bmap_dmxr[2]; /* max bmap btree records */
 110         uint                    m_bmap_dmnr[2]; /* min bmap btree records */
 111         uint                    m_inobt_mxr[2]; /* max inobt btree records */
 112         uint                    m_inobt_mnr[2]; /* min inobt btree records */
 113         uint                    m_rmap_mxr[2];  /* max rmap btree records */
 114         uint                    m_rmap_mnr[2];  /* min rmap btree records */
 115         uint                    m_refc_mxr[2];  /* max refc btree records */
 116         uint                    m_refc_mnr[2];  /* min refc btree records */
 117         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 118         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 119         uint                    m_in_maxlevels; /* max inobt btree levels. */
 120         uint                    m_rmap_maxlevels; /* max rmap btree levels */
 121         uint                    m_refc_maxlevels; /* max refcount btree level */
 122         xfs_extlen_t            m_ag_prealloc_blocks; /* reserved ag blocks */
 123         uint                    m_alloc_set_aside; /* space we can't use */
 124         uint                    m_ag_max_usable; /* max space per AG */
 125         struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
 126         spinlock_t              m_perag_lock;   /* lock for m_perag_tree */
 127         struct mutex            m_growlock;     /* growfs mutex */
 128         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 129         uint64_t                m_flags;        /* global mount flags */
 130         bool                    m_inotbt_nores; /* no per-AG finobt resv. */
 131         int                     m_ialloc_inos;  /* inodes in inode allocation */
 132         int                     m_ialloc_blks;  /* blocks in inode allocation */
 133         int                     m_ialloc_min_blks;/* min blocks in sparse inode
 134                                                    * allocation */
 135         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 136         uint                    m_qflags;       /* quota status flags */
 137         struct xfs_trans_resv   m_resv;         /* precomputed res values */
 138         uint64_t                m_maxicount;    /* maximum inode count */
 139         uint64_t                m_resblks;      /* total reserved blocks */
 140         uint64_t                m_resblks_avail;/* available reserved blocks */
 141         uint64_t                m_resblks_save; /* reserved blks @ remount,ro */
 142         int                     m_dalign;       /* stripe unit */
 143         int                     m_swidth;       /* stripe width */
 144         int                     m_sinoalign;    /* stripe unit inode alignment */
 145         uint8_t                 m_sectbb_log;   /* sectlog - BBSHIFT */
 146         const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
 147         const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
 148         const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
 149         uint                    m_chsize;       /* size of next field */
 150         atomic_t                m_active_trans; /* number trans frozen */
 151         struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 152         struct delayed_work     m_reclaim_work; /* background inode reclaim */
 153         struct delayed_work     m_eofblocks_work; /* background eof blocks
 154                                                      trimming */
 155         struct delayed_work     m_cowblocks_work; /* background cow blocks
 156                                                      trimming */
 157         bool                    m_update_sb;    /* sb needs update in mount */
 158         int64_t                 m_low_space[XFS_LOWSP_MAX];
 159                                                 /* low free space thresholds */
 160         struct xfs_kobj         m_kobj;
 161         struct xfs_kobj         m_error_kobj;
 162         struct xfs_kobj         m_error_meta_kobj;
 163         struct xfs_error_cfg    m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
 164         struct xstats           m_stats;        /* per-fs stats */
 165
 166         struct workqueue_struct *m_buf_workqueue;
 167         struct workqueue_struct *m_data_workqueue;
 168         struct workqueue_struct *m_unwritten_workqueue;
 169         struct workqueue_struct *m_cil_workqueue;
 170         struct workqueue_struct *m_reclaim_workqueue;
 171         struct workqueue_struct *m_log_workqueue;
 172         struct workqueue_struct *m_eofblocks_workqueue;
 173         struct workqueue_struct *m_sync_workqueue;
 174
 175         /*
 176          * Generation of the filesysyem layout.  This is incremented by each
 177          * growfs, and used by the pNFS server to ensure the client updates
 178          * its view of the block device once it gets a layout that might
 179          * reference the newly added blocks.  Does not need to be persistent
 180          * as long as we only allow file system size increments, but if we
 181          * ever support shrinks it would have to be persisted in addition
 182          * to various other kinds of pain inflicted on the pNFS server.
 183          */
 184         uint32_t                m_generation;
 185
 186         bool                    m_fail_unmount;
 187 #ifdef DEBUG
 188         /*
 189          * Frequency with which errors are injected.  Replaces xfs_etest; the
 190          * value stored in here is the inverse of the frequency with which the
 191          * error triggers.  1 = always, 2 = half the time, etc.
 192          */
 193         unsigned int            *m_errortag;
 194         struct xfs_kobj         m_errortag_kobj;
 195 #endif
 196 } xfs_mount_t;
 197
 198 /*
 199  * Flags for m_flags.
 200  */
 201 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 202                                                    must be synchronous except
 203                                                    for space allocations */
 204 #define XFS_MOUNT_UNMOUNTING    (1ULL << 1)     /* filesystem is unmounting */
 205 #define XFS_MOUNT_BAD_SUMMARY   (1ULL << 2)     /* summary counters are bad */
 206 #define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 207 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 208                                                    operations, typically for
 209                                                    disk errors in metadata */
 210 #define XFS_MOUNT_DISCARD       (1ULL << 5)     /* discard unused blocks */
 211 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 212                                                    allocations */
 213 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 214 #define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 215 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 216 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 217 #define XFS_MOUNT_SMALL_INUMS   (1ULL << 14)    /* user wants 32bit inodes */
 218 #define XFS_MOUNT_32BITINODES   (1ULL << 15)    /* inode32 allocator active */
 219 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 220 #define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 221 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 222                                                  * allocation */
 223 #define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 224 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 225 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 226                                                  * I/O size in stat() */
 227 #define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 228                                                    allocator */
 229 #define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 230
 231 #define XFS_MOUNT_DAX           (1ULL << 62)    /* TEST ONLY! */
 232
 233
 234 /*
 235  * Default minimum read and write sizes.
 236  */
 237 #define XFS_READIO_LOG_LARGE    16
 238 #define XFS_WRITEIO_LOG_LARGE   16
 239
 240 /*
 241  * Max and min values for mount-option defined I/O
 242  * preallocation sizes.
 243  */
 244 #define XFS_MAX_IO_LOG          30      /* 1G */
 245 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 246
 247 /*
 248  * Synchronous read and write sizes.  This should be
 249  * better for NFSv2 wsync filesystems.
 250  */
 251 #define XFS_WSYNC_READIO_LOG    15      /* 32k */
 252 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16k */
 253
 254 /*
 255  * Allow large block sizes to be reported to userspace programs if the
 256  * "largeio" mount option is used.
 257  *
 258  * If compatibility mode is specified, simply return the basic unit of caching
 259  * so that we don't get inefficient read/modify/write I/O from user apps.
 260  * Otherwise....
 261  *
 262  * If the underlying volume is a stripe, then return the stripe width in bytes
 263  * as the recommended I/O size. It is not a stripe and we've set a default
 264  * buffered I/O size, return that, otherwise return the compat default.
 265  */
 266 static inline unsigned long
 267 xfs_preferred_iosize(xfs_mount_t *mp)
 268 {
 269         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 270                 return PAGE_SIZE;
 271         return (mp->m_swidth ?
 272                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 273                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 274                         (1 << (int)max(mp->m_readio_log, mp->m_writeio_log)) :
 275                         PAGE_SIZE));
 276 }
 277
 278 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 279                                 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 280 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 281 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 282                 int lnnum);
 283 #define xfs_force_shutdown(m,f) \
 284         xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 285
 286 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 287 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 288 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 289 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 290 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 291 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 292
 293 /*
 294  * Flags for xfs_mountfs
 295  */
 296 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 297
 298 static inline xfs_agnumber_t
 299 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 300 {
 301         xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
 302         do_div(ld, mp->m_sb.sb_agblocks);
 303         return (xfs_agnumber_t) ld;
 304 }
 305
 306 static inline xfs_agblock_t
 307 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 308 {
 309         xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
 310         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 311 }
 312
 313 /* per-AG block reservation data structures*/
 314 enum xfs_ag_resv_type {
 315         XFS_AG_RESV_NONE = 0,
 316         XFS_AG_RESV_AGFL,
 317         XFS_AG_RESV_METADATA,
 318         XFS_AG_RESV_RMAPBT,
 319 };
 320
 321 struct xfs_ag_resv {
 322         /* number of blocks originally reserved here */
 323         xfs_extlen_t                    ar_orig_reserved;
 324         /* number of blocks reserved here */
 325         xfs_extlen_t                    ar_reserved;
 326         /* number of blocks originally asked for */
 327         xfs_extlen_t                    ar_asked;
 328 };
 329
 330 /*
 331  * Per-ag incore structure, copies of information in agf and agi, to improve the
 332  * performance of allocation group selection.
 333  */
 334 typedef struct xfs_perag {
 335         struct xfs_mount *pag_mount;    /* owner filesystem */
 336         xfs_agnumber_t  pag_agno;       /* AG this structure belongs to */
 337         atomic_t        pag_ref;        /* perag reference count */
 338         char            pagf_init;      /* this agf's entry is initialized */
 339         char            pagi_init;      /* this agi's entry is initialized */
 340         char            pagf_metadata;  /* the agf is preferred to be metadata */
 341         char            pagi_inodeok;   /* The agi is ok for inodes */
 342         uint8_t         pagf_levels[XFS_BTNUM_AGF];
 343                                         /* # of levels in bno & cnt btree */
 344         bool            pagf_agflreset; /* agfl requires reset before use */
 345         uint32_t        pagf_flcount;   /* count of blocks in freelist */
 346         xfs_extlen_t    pagf_freeblks;  /* total free blocks */
 347         xfs_extlen_t    pagf_longest;   /* longest free space */
 348         uint32_t        pagf_btreeblks; /* # of blocks held in AGF btrees */
 349         xfs_agino_t     pagi_freecount; /* number of free inodes */
 350         xfs_agino_t     pagi_count;     /* number of allocated inodes */
 351
 352         /*
 353          * Inode allocation search lookup optimisation.
 354          * If the pagino matches, the search for new inodes
 355          * doesn't need to search the near ones again straight away
 356          */
 357         xfs_agino_t     pagl_pagino;
 358         xfs_agino_t     pagl_leftrec;
 359         xfs_agino_t     pagl_rightrec;
 360         spinlock_t      pagb_lock;      /* lock for pagb_tree */
 361         struct rb_root  pagb_tree;      /* ordered tree of busy extents */
 362         unsigned int    pagb_gen;       /* generation count for pagb_tree */
 363         wait_queue_head_t pagb_wait;    /* woken when pagb_gen changes */
 364
 365         atomic_t        pagf_fstrms;    /* # of filestreams active in this AG */
 366
 367         spinlock_t      pag_ici_lock;   /* incore inode cache lock */
 368         struct radix_tree_root pag_ici_root;    /* incore inode cache root */
 369         int             pag_ici_reclaimable;    /* reclaimable inodes */
 370         struct mutex    pag_ici_reclaim_lock;   /* serialisation point */
 371         unsigned long   pag_ici_reclaim_cursor; /* reclaim restart point */
 372
 373         /* buffer cache index */
 374         spinlock_t      pag_buf_lock;   /* lock for pag_buf_hash */
 375         struct rhashtable pag_buf_hash;
 376
 377         /* for rcu-safe freeing */
 378         struct rcu_head rcu_head;
 379         int             pagb_count;     /* pagb slots in use */
 380
 381         /* Blocks reserved for all kinds of metadata. */
 382         struct xfs_ag_resv      pag_meta_resv;
 383         /* Blocks reserved for the reverse mapping btree. */
 384         struct xfs_ag_resv      pag_rmapbt_resv;
 385
 386         /* reference count */
 387         uint8_t                 pagf_refcount_level;
 388 } xfs_perag_t;
 389
 390 static inline struct xfs_ag_resv *
 391 xfs_perag_resv(
 392         struct xfs_perag        *pag,
 393         enum xfs_ag_resv_type   type)
 394 {
 395         switch (type) {
 396         case XFS_AG_RESV_METADATA:
 397                 return &pag->pag_meta_resv;
 398         case XFS_AG_RESV_RMAPBT:
 399                 return &pag->pag_rmapbt_resv;
 400         default:
 401                 return NULL;
 402         }
 403 }
 404
 405 int xfs_buf_hash_init(xfs_perag_t *pag);
 406 void xfs_buf_hash_destroy(xfs_perag_t *pag);
 407
 408 extern void     xfs_uuid_table_free(void);
 409 extern int      xfs_log_sbcount(xfs_mount_t *);
 410 extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
 411 extern int      xfs_mountfs(xfs_mount_t *mp);
 412 extern int      xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
 413                                      xfs_agnumber_t *maxagi);
 414 extern void     xfs_unmountfs(xfs_mount_t *);
 415
 416 extern int      xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
 417 extern int      xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
 418 extern int      xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
 419                                  bool reserved);
 420 extern int      xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
 421
 422 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 423 extern int      xfs_readsb(xfs_mount_t *, int);
 424 extern void     xfs_freesb(xfs_mount_t *);
 425 extern bool     xfs_fs_writable(struct xfs_mount *mp, int level);
 426 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
 427
 428 extern int      xfs_dev_is_read_only(struct xfs_mount *, char *);
 429
 430 extern void     xfs_set_low_space_thresholds(struct xfs_mount *);
 431
 432 int     xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
 433                         xfs_off_t count_fsb);
 434
 435 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
 436                 int error_class, int error);
 437 void xfs_force_summary_recalc(struct xfs_mount *mp);
 438
 439 #endif  /* __XFS_MOUNT_H__ */