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_ail;
  13 struct xfs_quotainfo;
  14 struct xfs_da_geometry;
  15
  16 /* dynamic preallocation free space thresholds, 5% down to 1% */
  17 enum {
  18         XFS_LOWSP_1_PCNT = 0,
  19         XFS_LOWSP_2_PCNT,
  20         XFS_LOWSP_3_PCNT,
  21         XFS_LOWSP_4_PCNT,
  22         XFS_LOWSP_5_PCNT,
  23         XFS_LOWSP_MAX,
  24 };
  25
  26 /*
  27  * Error Configuration
  28  *
  29  * Error classes define the subsystem the configuration belongs to.
  30  * Error numbers define the errors that are configurable.
  31  */
  32 enum {
  33         XFS_ERR_METADATA,
  34         XFS_ERR_CLASS_MAX,
  35 };
  36 enum {
  37         XFS_ERR_DEFAULT,
  38         XFS_ERR_EIO,
  39         XFS_ERR_ENOSPC,
  40         XFS_ERR_ENODEV,
  41         XFS_ERR_ERRNO_MAX,
  42 };
  43
  44 #define XFS_ERR_RETRY_FOREVER   -1
  45
  46 /*
  47  * Although retry_timeout is in jiffies which is normally an unsigned long,
  48  * we limit the retry timeout to 86400 seconds, or one day.  So even a
  49  * signed 32-bit long is sufficient for a HZ value up to 24855.  Making it
  50  * signed lets us store the special "-1" value, meaning retry forever.
  51  */
  52 struct xfs_error_cfg {
  53         struct xfs_kobj kobj;
  54         int             max_retries;
  55         long            retry_timeout;  /* in jiffies, -1 = infinite */
  56 };
  57
  58 typedef struct xfs_mount {
  59         struct super_block      *m_super;
  60
  61         /*
  62          * Bitsets of per-fs metadata that have been checked and/or are sick.
  63          * Callers must hold m_sb_lock to access these two fields.
  64          */
  65         uint8_t                 m_fs_checked;
  66         uint8_t                 m_fs_sick;
  67         /*
  68          * Bitsets of rt metadata that have been checked and/or are sick.
  69          * Callers must hold m_sb_lock to access this field.
  70          */
  71         uint8_t                 m_rt_checked;
  72         uint8_t                 m_rt_sick;
  73
  74         struct xfs_ail          *m_ail;         /* fs active log item list */
  75
  76         struct xfs_sb           m_sb;           /* copy of fs superblock */
  77         spinlock_t              m_sb_lock;      /* sb counter lock */
  78         struct percpu_counter   m_icount;       /* allocated inodes counter */
  79         struct percpu_counter   m_ifree;        /* free inodes counter */
  80         struct percpu_counter   m_fdblocks;     /* free block counter */
  81         /*
  82          * Count of data device blocks reserved for delayed allocations,
  83          * including indlen blocks.  Does not include allocated CoW staging
  84          * extents or anything related to the rt device.
  85          */
  86         struct percpu_counter   m_delalloc_blks;
  87
  88         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
  89         char                    *m_rtname;      /* realtime device name */
  90         char                    *m_logname;     /* external log device name */
  91         int                     m_bsize;        /* fs logical block size */
  92         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
  93         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
  94         spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
  95         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
  96         uint                    m_allocsize_log;/* min write size log bytes */
  97         uint                    m_allocsize_blocks; /* min write size blocks */
  98         struct xfs_da_geometry  *m_dir_geo;     /* directory block geometry */
  99         struct xfs_da_geometry  *m_attr_geo;    /* attribute block geometry */
 100         struct xlog             *m_log;         /* log specific stuff */
 101         struct xfs_ino_geometry m_ino_geo;      /* inode geometry */
 102         int                     m_logbufs;      /* number of log buffers */
 103         int                     m_logbsize;     /* size of each log buffer */
 104         uint                    m_rsumlevels;   /* rt summary levels */
 105         uint                    m_rsumsize;     /* size of rt summary, bytes */
 106         /*
 107          * Optional cache of rt summary level per bitmap block with the
 108          * invariant that m_rsum_cache[bbno] <= the minimum i for which
 109          * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
 110          * inode lock.
 111          */
 112         uint8_t                 *m_rsum_cache;
 113         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
 114         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
 115         struct xfs_inode        *m_rootip;      /* pointer to root directory */
 116         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
 117         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
 118         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
 119         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
 120         uint8_t                 m_blkbit_log;   /* blocklog + NBBY */
 121         uint8_t                 m_blkbb_log;    /* blocklog - BBSHIFT */
 122         uint8_t                 m_agno_log;     /* log #ag's */
 123         uint                    m_blockmask;    /* sb_blocksize-1 */
 124         uint                    m_blockwsize;   /* sb_blocksize in words */
 125         uint                    m_blockwmask;   /* blockwsize-1 */
 126         uint                    m_alloc_mxr[2]; /* max alloc btree records */
 127         uint                    m_alloc_mnr[2]; /* min alloc btree records */
 128         uint                    m_bmap_dmxr[2]; /* max bmap btree records */
 129         uint                    m_bmap_dmnr[2]; /* min bmap btree records */
 130         uint                    m_rmap_mxr[2];  /* max rmap btree records */
 131         uint                    m_rmap_mnr[2];  /* min rmap btree records */
 132         uint                    m_refc_mxr[2];  /* max refc btree records */
 133         uint                    m_refc_mnr[2];  /* min refc btree records */
 134         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
 135         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
 136         uint                    m_rmap_maxlevels; /* max rmap btree levels */
 137         uint                    m_refc_maxlevels; /* max refcount btree level */
 138         xfs_extlen_t            m_ag_prealloc_blocks; /* reserved ag blocks */
 139         uint                    m_alloc_set_aside; /* space we can't use */
 140         uint                    m_ag_max_usable; /* max space per AG */
 141         struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
 142         spinlock_t              m_perag_lock;   /* lock for m_perag_tree */
 143         struct mutex            m_growlock;     /* growfs mutex */
 144         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 145         uint64_t                m_flags;        /* global mount flags */
 146         bool                    m_finobt_nores; /* no per-AG finobt resv. */
 147         uint                    m_qflags;       /* quota status flags */
 148         struct xfs_trans_resv   m_resv;         /* precomputed res values */
 149         uint64_t                m_resblks;      /* total reserved blocks */
 150         uint64_t                m_resblks_avail;/* available reserved blocks */
 151         uint64_t                m_resblks_save; /* reserved blks @ remount,ro */
 152         int                     m_dalign;       /* stripe unit */
 153         int                     m_swidth;       /* stripe width */
 154         uint8_t                 m_sectbb_log;   /* sectlog - BBSHIFT */
 155         atomic_t                m_active_trans; /* number trans frozen */
 156         struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 157         struct delayed_work     m_reclaim_work; /* background inode reclaim */
 158         struct delayed_work     m_eofblocks_work; /* background eof blocks
 159                                                      trimming */
 160         struct delayed_work     m_cowblocks_work; /* background cow blocks
 161                                                      trimming */
 162         bool                    m_update_sb;    /* sb needs update in mount */
 163         int64_t                 m_low_space[XFS_LOWSP_MAX];
 164                                                 /* low free space thresholds */
 165         struct xfs_kobj         m_kobj;
 166         struct xfs_kobj         m_error_kobj;
 167         struct xfs_kobj         m_error_meta_kobj;
 168         struct xfs_error_cfg    m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
 169         struct xstats           m_stats;        /* per-fs stats */
 170         struct ratelimit_state  m_flush_inodes_ratelimit;
 171
 172         struct workqueue_struct *m_buf_workqueue;
 173         struct workqueue_struct *m_unwritten_workqueue;
 174         struct workqueue_struct *m_cil_workqueue;
 175         struct workqueue_struct *m_reclaim_workqueue;
 176         struct workqueue_struct *m_eofblocks_workqueue;
 177         struct workqueue_struct *m_sync_workqueue;
 178
 179         /*
 180          * Generation of the filesysyem layout.  This is incremented by each
 181          * growfs, and used by the pNFS server to ensure the client updates
 182          * its view of the block device once it gets a layout that might
 183          * reference the newly added blocks.  Does not need to be persistent
 184          * as long as we only allow file system size increments, but if we
 185          * ever support shrinks it would have to be persisted in addition
 186          * to various other kinds of pain inflicted on the pNFS server.
 187          */
 188         uint32_t                m_generation;
 189
 190         bool                    m_always_cow;
 191         bool                    m_fail_unmount;
 192 #ifdef DEBUG
 193         /*
 194          * Frequency with which errors are injected.  Replaces xfs_etest; the
 195          * value stored in here is the inverse of the frequency with which the
 196          * error triggers.  1 = always, 2 = half the time, etc.
 197          */
 198         unsigned int            *m_errortag;
 199         struct xfs_kobj         m_errortag_kobj;
 200 #endif
 201 } xfs_mount_t;
 202
 203 #define M_IGEO(mp)              (&(mp)->m_ino_geo)
 204
 205 /*
 206  * Flags for m_flags.
 207  */
 208 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 209                                                    must be synchronous except
 210                                                    for space allocations */
 211 #define XFS_MOUNT_UNMOUNTING    (1ULL << 1)     /* filesystem is unmounting */
 212 #define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 213 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 214                                                    operations, typically for
 215                                                    disk errors in metadata */
 216 #define XFS_MOUNT_DISCARD       (1ULL << 5)     /* discard unused blocks */
 217 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 218                                                    allocations */
 219 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 220 #define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 221 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 222 #define XFS_MOUNT_ALLOCSIZE     (1ULL << 12)    /* specified allocation size */
 223 #define XFS_MOUNT_SMALL_INUMS   (1ULL << 14)    /* user wants 32bit inodes */
 224 #define XFS_MOUNT_32BITINODES   (1ULL << 15)    /* inode32 allocator active */
 225 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 226 #define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 227 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 228                                                  * allocation */
 229 #define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 230 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 231 #define XFS_MOUNT_LARGEIO       (1ULL << 22)    /* report large preferred
 232                                                  * I/O size in stat() */
 233 #define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 234                                                    allocator */
 235 #define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 236
 237 #define XFS_MOUNT_DAX           (1ULL << 62)    /* TEST ONLY! */
 238
 239 /*
 240  * Max and min values for mount-option defined I/O
 241  * preallocation sizes.
 242  */
 243 #define XFS_MAX_IO_LOG          30      /* 1G */
 244 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 245
 246 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 247                                 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 248 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 249 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 250                 int lnnum);
 251 #define xfs_force_shutdown(m,f) \
 252         xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 253
 254 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 255 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 256 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 257 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 258 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 259 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 260
 261 /*
 262  * Flags for xfs_mountfs
 263  */
 264 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 265
 266 static inline xfs_agnumber_t
 267 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 268 {
 269         xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
 270         do_div(ld, mp->m_sb.sb_agblocks);
 271         return (xfs_agnumber_t) ld;
 272 }
 273
 274 static inline xfs_agblock_t
 275 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 276 {
 277         xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
 278         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 279 }
 280
 281 /* per-AG block reservation data structures*/
 282 struct xfs_ag_resv {
 283         /* number of blocks originally reserved here */
 284         xfs_extlen_t                    ar_orig_reserved;
 285         /* number of blocks reserved here */
 286         xfs_extlen_t                    ar_reserved;
 287         /* number of blocks originally asked for */
 288         xfs_extlen_t                    ar_asked;
 289 };
 290
 291 /*
 292  * Per-ag incore structure, copies of information in agf and agi, to improve the
 293  * performance of allocation group selection.
 294  */
 295 typedef struct xfs_perag {
 296         struct xfs_mount *pag_mount;    /* owner filesystem */
 297         xfs_agnumber_t  pag_agno;       /* AG this structure belongs to */
 298         atomic_t        pag_ref;        /* perag reference count */
 299         char            pagf_init;      /* this agf's entry is initialized */
 300         char            pagi_init;      /* this agi's entry is initialized */
 301         char            pagf_metadata;  /* the agf is preferred to be metadata */
 302         char            pagi_inodeok;   /* The agi is ok for inodes */
 303         uint8_t         pagf_levels[XFS_BTNUM_AGF];
 304                                         /* # of levels in bno & cnt btree */
 305         bool            pagf_agflreset; /* agfl requires reset before use */
 306         uint32_t        pagf_flcount;   /* count of blocks in freelist */
 307         xfs_extlen_t    pagf_freeblks;  /* total free blocks */
 308         xfs_extlen_t    pagf_longest;   /* longest free space */
 309         uint32_t        pagf_btreeblks; /* # of blocks held in AGF btrees */
 310         xfs_agino_t     pagi_freecount; /* number of free inodes */
 311         xfs_agino_t     pagi_count;     /* number of allocated inodes */
 312
 313         /*
 314          * Inode allocation search lookup optimisation.
 315          * If the pagino matches, the search for new inodes
 316          * doesn't need to search the near ones again straight away
 317          */
 318         xfs_agino_t     pagl_pagino;
 319         xfs_agino_t     pagl_leftrec;
 320         xfs_agino_t     pagl_rightrec;
 321
 322         /*
 323          * Bitsets of per-ag metadata that have been checked and/or are sick.
 324          * Callers should hold pag_state_lock before accessing this field.
 325          */
 326         uint16_t        pag_checked;
 327         uint16_t        pag_sick;
 328         spinlock_t      pag_state_lock;
 329
 330         spinlock_t      pagb_lock;      /* lock for pagb_tree */
 331         struct rb_root  pagb_tree;      /* ordered tree of busy extents */
 332         unsigned int    pagb_gen;       /* generation count for pagb_tree */
 333         wait_queue_head_t pagb_wait;    /* woken when pagb_gen changes */
 334
 335         atomic_t        pagf_fstrms;    /* # of filestreams active in this AG */
 336
 337         spinlock_t      pag_ici_lock;   /* incore inode cache lock */
 338         struct radix_tree_root pag_ici_root;    /* incore inode cache root */
 339         int             pag_ici_reclaimable;    /* reclaimable inodes */
 340         struct mutex    pag_ici_reclaim_lock;   /* serialisation point */
 341         unsigned long   pag_ici_reclaim_cursor; /* reclaim restart point */
 342
 343         /* buffer cache index */
 344         spinlock_t      pag_buf_lock;   /* lock for pag_buf_hash */
 345         struct rhashtable pag_buf_hash;
 346
 347         /* for rcu-safe freeing */
 348         struct rcu_head rcu_head;
 349         int             pagb_count;     /* pagb slots in use */
 350
 351         /* Blocks reserved for all kinds of metadata. */
 352         struct xfs_ag_resv      pag_meta_resv;
 353         /* Blocks reserved for the reverse mapping btree. */
 354         struct xfs_ag_resv      pag_rmapbt_resv;
 355
 356         /* reference count */
 357         uint8_t                 pagf_refcount_level;
 358
 359         /*
 360          * Unlinked inode information.  This incore information reflects
 361          * data stored in the AGI, so callers must hold the AGI buffer lock
 362          * or have some other means to control concurrency.
 363          */
 364         struct rhashtable       pagi_unlinked_hash;
 365 } xfs_perag_t;
 366
 367 static inline struct xfs_ag_resv *
 368 xfs_perag_resv(
 369         struct xfs_perag        *pag,
 370         enum xfs_ag_resv_type   type)
 371 {
 372         switch (type) {
 373         case XFS_AG_RESV_METADATA:
 374                 return &pag->pag_meta_resv;
 375         case XFS_AG_RESV_RMAPBT:
 376                 return &pag->pag_rmapbt_resv;
 377         default:
 378                 return NULL;
 379         }
 380 }
 381
 382 int xfs_buf_hash_init(xfs_perag_t *pag);
 383 void xfs_buf_hash_destroy(xfs_perag_t *pag);
 384
 385 extern void     xfs_uuid_table_free(void);
 386 extern int      xfs_log_sbcount(xfs_mount_t *);
 387 extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
 388 extern int      xfs_mountfs(xfs_mount_t *mp);
 389 extern int      xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
 390                                      xfs_agnumber_t *maxagi);
 391 extern void     xfs_unmountfs(xfs_mount_t *);
 392
 393 extern int      xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
 394 extern int      xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
 395 extern int      xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
 396                                  bool reserved);
 397 extern int      xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
 398
 399 extern struct xfs_buf *xfs_getsb(xfs_mount_t *);
 400 extern int      xfs_readsb(xfs_mount_t *, int);
 401 extern void     xfs_freesb(xfs_mount_t *);
 402 extern bool     xfs_fs_writable(struct xfs_mount *mp, int level);
 403 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
 404
 405 extern int      xfs_dev_is_read_only(struct xfs_mount *, char *);
 406
 407 extern void     xfs_set_low_space_thresholds(struct xfs_mount *);
 408
 409 int     xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
 410                         xfs_off_t count_fsb);
 411
 412 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
 413                 int error_class, int error);
 414 void xfs_force_summary_recalc(struct xfs_mount *mp);
 415 void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
 416
 417 #endif  /* __XFS_MOUNT_H__ */