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 struct xlog;
  22 struct xfs_inode;
  23 struct xfs_mru_cache;
  24 struct xfs_nameops;
  25 struct xfs_ail;
  26 struct xfs_quotainfo;
  27 struct xfs_dir_ops;
  28 struct xfs_da_geometry;
  29
  30 /* dynamic preallocation free space thresholds, 5% down to 1% */
  31 enum {
  32         XFS_LOWSP_1_PCNT = 0,
  33         XFS_LOWSP_2_PCNT,
  34         XFS_LOWSP_3_PCNT,
  35         XFS_LOWSP_4_PCNT,
  36         XFS_LOWSP_5_PCNT,
  37         XFS_LOWSP_MAX,
  38 };
  39
  40 typedef struct xfs_mount {
  41         struct super_block      *m_super;
  42         xfs_tid_t               m_tid;          /* next unused tid for fs */
  43         struct xfs_ail          *m_ail;         /* fs active log item list */
  44
  45         struct xfs_sb           m_sb;           /* copy of fs superblock */
  46         spinlock_t              m_sb_lock;      /* sb counter lock */
  47         struct percpu_counter   m_icount;       /* allocated inodes counter */
  48         struct percpu_counter   m_ifree;        /* free inodes counter */
  49         struct percpu_counter   m_fdblocks;     /* free block counter */
  50
  51         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */
  52         char                    *m_fsname;      /* filesystem name */
  53         int                     m_fsname_len;   /* strlen of fs name */
  54         char                    *m_rtname;      /* realtime device name */
  55         char                    *m_logname;     /* external log device name */
  56         int                     m_bsize;        /* fs logical block size */
  57         xfs_agnumber_t          m_agfrotor;     /* last ag where space found */
  58         xfs_agnumber_t          m_agirotor;     /* last ag dir inode alloced */
  59         spinlock_t              m_agirotor_lock;/* .. and lock protecting it */
  60         xfs_agnumber_t          m_maxagi;       /* highest inode alloc group */
  61         uint                    m_readio_log;   /* min read size log bytes */
  62         uint                    m_readio_blocks; /* min read size blocks */
  63         uint                    m_writeio_log;  /* min write size log bytes */
  64         uint                    m_writeio_blocks; /* min write size blocks */
  65         struct xfs_da_geometry  *m_dir_geo;     /* directory block geometry */
  66         struct xfs_da_geometry  *m_attr_geo;    /* attribute block geometry */
  67         struct xlog             *m_log;         /* log specific stuff */
  68         int                     m_logbufs;      /* number of log buffers */
  69         int                     m_logbsize;     /* size of each log buffer */
  70         uint                    m_rsumlevels;   /* rt summary levels */
  71         uint                    m_rsumsize;     /* size of rt summary, bytes */
  72         struct xfs_inode        *m_rbmip;       /* pointer to bitmap inode */
  73         struct xfs_inode        *m_rsumip;      /* pointer to summary inode */
  74         struct xfs_inode        *m_rootip;      /* pointer to root directory */
  75         struct xfs_quotainfo    *m_quotainfo;   /* disk quota information */
  76         xfs_buftarg_t           *m_ddev_targp;  /* saves taking the address */
  77         xfs_buftarg_t           *m_logdev_targp;/* ptr to log device */
  78         xfs_buftarg_t           *m_rtdev_targp; /* ptr to rt device */
  79         __uint8_t               m_blkbit_log;   /* blocklog + NBBY */
  80         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
  81         __uint8_t               m_agno_log;     /* log #ag's */
  82         __uint8_t               m_agino_log;    /* #bits for agino in inum */
  83         uint                    m_inode_cluster_size;/* min inode buf size */
  84         uint                    m_blockmask;    /* sb_blocksize-1 */
  85         uint                    m_blockwsize;   /* sb_blocksize in words */
  86         uint                    m_blockwmask;   /* blockwsize-1 */
  87         uint                    m_alloc_mxr[2]; /* max alloc btree records */
  88         uint                    m_alloc_mnr[2]; /* min alloc btree records */
  89         uint                    m_bmap_dmxr[2]; /* max bmap btree records */
  90         uint                    m_bmap_dmnr[2]; /* min bmap btree records */
  91         uint                    m_inobt_mxr[2]; /* max inobt btree records */
  92         uint                    m_inobt_mnr[2]; /* min inobt btree records */
  93         uint                    m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
  94         uint                    m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
  95         uint                    m_in_maxlevels; /* max inobt btree levels. */
  96         struct radix_tree_root  m_perag_tree;   /* per-ag accounting info */
  97         spinlock_t              m_perag_lock;   /* lock for m_perag_tree */
  98         struct mutex            m_growlock;     /* growfs mutex */
  99         int                     m_fixedfsid[2]; /* unchanged for life of FS */
 100         uint                    m_dmevmask;     /* DMI events for this FS */
 101         __uint64_t              m_flags;        /* global mount flags */
 102         int                     m_ialloc_inos;  /* inodes in inode allocation */
 103         int                     m_ialloc_blks;  /* blocks in inode allocation */
 104         int                     m_ialloc_min_blks;/* min blocks in sparse inode
 105                                                    * allocation */
 106         int                     m_inoalign_mask;/* mask sb_inoalignmt if used */
 107         uint                    m_qflags;       /* quota status flags */
 108         struct xfs_trans_resv   m_resv;         /* precomputed res values */
 109         __uint64_t              m_maxicount;    /* maximum inode count */
 110         __uint64_t              m_resblks;      /* total reserved blocks */
 111         __uint64_t              m_resblks_avail;/* available reserved blocks */
 112         __uint64_t              m_resblks_save; /* reserved blks @ remount,ro */
 113         int                     m_dalign;       /* stripe unit */
 114         int                     m_swidth;       /* stripe width */
 115         int                     m_sinoalign;    /* stripe unit inode alignment */
 116         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
 117         const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
 118         const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
 119         const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
 120         uint                    m_chsize;       /* size of next field */
 121         atomic_t                m_active_trans; /* number trans frozen */
 122         struct xfs_mru_cache    *m_filestream;  /* per-mount filestream data */
 123         struct delayed_work     m_reclaim_work; /* background inode reclaim */
 124         struct delayed_work     m_eofblocks_work; /* background eof blocks
 125                                                      trimming */
 126         bool                    m_update_sb;    /* sb needs update in mount */
 127         int64_t                 m_low_space[XFS_LOWSP_MAX];
 128                                                 /* low free space thresholds */
 129         struct xfs_kobj         m_kobj;
 130         struct xstats           m_stats;        /* per-fs stats */
 131
 132         struct workqueue_struct *m_buf_workqueue;
 133         struct workqueue_struct *m_data_workqueue;
 134         struct workqueue_struct *m_unwritten_workqueue;
 135         struct workqueue_struct *m_cil_workqueue;
 136         struct workqueue_struct *m_reclaim_workqueue;
 137         struct workqueue_struct *m_log_workqueue;
 138         struct workqueue_struct *m_eofblocks_workqueue;
 139
 140         /*
 141          * Generation of the filesysyem layout.  This is incremented by each
 142          * growfs, and used by the pNFS server to ensure the client updates
 143          * its view of the block device once it gets a layout that might
 144          * reference the newly added blocks.  Does not need to be persistent
 145          * as long as we only allow file system size increments, but if we
 146          * ever support shrinks it would have to be persisted in addition
 147          * to various other kinds of pain inflicted on the pNFS server.
 148          */
 149         __uint32_t              m_generation;
 150
 151 #ifdef DEBUG
 152         /*
 153          * DEBUG mode instrumentation to test and/or trigger delayed allocation
 154          * block killing in the event of failed writes. When enabled, all
 155          * buffered writes are forced to fail. All delalloc blocks in the range
 156          * of the write (including pre-existing delalloc blocks!) are tossed as
 157          * part of the write failure error handling sequence.
 158          */
 159         bool                    m_fail_writes;
 160 #endif
 161 } xfs_mount_t;
 162
 163 /*
 164  * Flags for m_flags.
 165  */
 166 #define XFS_MOUNT_WSYNC         (1ULL << 0)     /* for nfs - all metadata ops
 167                                                    must be synchronous except
 168                                                    for space allocations */
 169 #define XFS_MOUNT_WAS_CLEAN     (1ULL << 3)
 170 #define XFS_MOUNT_FS_SHUTDOWN   (1ULL << 4)     /* atomic stop of all filesystem
 171                                                    operations, typically for
 172                                                    disk errors in metadata */
 173 #define XFS_MOUNT_DISCARD       (1ULL << 5)     /* discard unused blocks */
 174 #define XFS_MOUNT_NOALIGN       (1ULL << 7)     /* turn off stripe alignment
 175                                                    allocations */
 176 #define XFS_MOUNT_ATTR2         (1ULL << 8)     /* allow use of attr2 format */
 177 #define XFS_MOUNT_GRPID         (1ULL << 9)     /* group-ID assigned from directory */
 178 #define XFS_MOUNT_NORECOVERY    (1ULL << 10)    /* no recovery - dirty fs */
 179 #define XFS_MOUNT_DFLT_IOSIZE   (1ULL << 12)    /* set default i/o size */
 180 #define XFS_MOUNT_SMALL_INUMS   (1ULL << 14)    /* user wants 32bit inodes */
 181 #define XFS_MOUNT_32BITINODES   (1ULL << 15)    /* inode32 allocator active */
 182 #define XFS_MOUNT_NOUUID        (1ULL << 16)    /* ignore uuid during mount */
 183 #define XFS_MOUNT_BARRIER       (1ULL << 17)
 184 #define XFS_MOUNT_IKEEP         (1ULL << 18)    /* keep empty inode clusters*/
 185 #define XFS_MOUNT_SWALLOC       (1ULL << 19)    /* turn on stripe width
 186                                                  * allocation */
 187 #define XFS_MOUNT_RDONLY        (1ULL << 20)    /* read-only fs */
 188 #define XFS_MOUNT_DIRSYNC       (1ULL << 21)    /* synchronous directory ops */
 189 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22)    /* don't report large preferred
 190                                                  * I/O size in stat() */
 191 #define XFS_MOUNT_FILESTREAMS   (1ULL << 24)    /* enable the filestreams
 192                                                    allocator */
 193 #define XFS_MOUNT_NOATTR2       (1ULL << 25)    /* disable use of attr2 format */
 194
 195 #define XFS_MOUNT_DAX           (1ULL << 62)    /* TEST ONLY! */
 196
 197
 198 /*
 199  * Default minimum read and write sizes.
 200  */
 201 #define XFS_READIO_LOG_LARGE    16
 202 #define XFS_WRITEIO_LOG_LARGE   16
 203
 204 /*
 205  * Max and min values for mount-option defined I/O
 206  * preallocation sizes.
 207  */
 208 #define XFS_MAX_IO_LOG          30      /* 1G */
 209 #define XFS_MIN_IO_LOG          PAGE_SHIFT
 210
 211 /*
 212  * Synchronous read and write sizes.  This should be
 213  * better for NFSv2 wsync filesystems.
 214  */
 215 #define XFS_WSYNC_READIO_LOG    15      /* 32k */
 216 #define XFS_WSYNC_WRITEIO_LOG   14      /* 16k */
 217
 218 /*
 219  * Allow large block sizes to be reported to userspace programs if the
 220  * "largeio" mount option is used.
 221  *
 222  * If compatibility mode is specified, simply return the basic unit of caching
 223  * so that we don't get inefficient read/modify/write I/O from user apps.
 224  * Otherwise....
 225  *
 226  * If the underlying volume is a stripe, then return the stripe width in bytes
 227  * as the recommended I/O size. It is not a stripe and we've set a default
 228  * buffered I/O size, return that, otherwise return the compat default.
 229  */
 230 static inline unsigned long
 231 xfs_preferred_iosize(xfs_mount_t *mp)
 232 {
 233         if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
 234                 return PAGE_CACHE_SIZE;
 235         return (mp->m_swidth ?
 236                 (mp->m_swidth << mp->m_sb.sb_blocklog) :
 237                 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
 238                         (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
 239                         PAGE_CACHE_SIZE));
 240 }
 241
 242 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp)  \
 243                                 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
 244 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
 245 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 246                 int lnnum);
 247 #define xfs_force_shutdown(m,f) \
 248         xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
 249
 250 #define SHUTDOWN_META_IO_ERROR  0x0001  /* write attempt to metadata failed */
 251 #define SHUTDOWN_LOG_IO_ERROR   0x0002  /* write attempt to the log failed */
 252 #define SHUTDOWN_FORCE_UMOUNT   0x0004  /* shutdown from a forced unmount */
 253 #define SHUTDOWN_CORRUPT_INCORE 0x0008  /* corrupt in-memory data structures */
 254 #define SHUTDOWN_REMOTE_REQ     0x0010  /* shutdown came from remote cell */
 255 #define SHUTDOWN_DEVICE_REQ     0x0020  /* failed all paths to the device */
 256
 257 /*
 258  * Flags for xfs_mountfs
 259  */
 260 #define XFS_MFSI_QUIET          0x40    /* Be silent if mount errors found */
 261
 262 static inline xfs_agnumber_t
 263 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
 264 {
 265         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 266         do_div(ld, mp->m_sb.sb_agblocks);
 267         return (xfs_agnumber_t) ld;
 268 }
 269
 270 static inline xfs_agblock_t
 271 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 272 {
 273         xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
 274         return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
 275 }
 276
 277 #ifdef DEBUG
 278 static inline bool
 279 xfs_mp_fail_writes(struct xfs_mount *mp)
 280 {
 281         return mp->m_fail_writes;
 282 }
 283 #else
 284 static inline bool
 285 xfs_mp_fail_writes(struct xfs_mount *mp)
 286 {
 287         return 0;
 288 }
 289 #endif
 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         __uint32_t      pagf_flcount;   /* count of blocks in freelist */
 306         xfs_extlen_t    pagf_freeblks;  /* total free blocks */
 307         xfs_extlen_t    pagf_longest;   /* longest free space */
 308         __uint32_t      pagf_btreeblks; /* # of blocks held in AGF btrees */
 309         xfs_agino_t     pagi_freecount; /* number of free inodes */
 310         xfs_agino_t     pagi_count;     /* number of allocated inodes */
 311
 312         /*
 313          * Inode allocation search lookup optimisation.
 314          * If the pagino matches, the search for new inodes
 315          * doesn't need to search the near ones again straight away
 316          */
 317         xfs_agino_t     pagl_pagino;
 318         xfs_agino_t     pagl_leftrec;
 319         xfs_agino_t     pagl_rightrec;
 320         spinlock_t      pagb_lock;      /* lock for pagb_tree */
 321         struct rb_root  pagb_tree;      /* ordered tree of busy extents */
 322
 323         atomic_t        pagf_fstrms;    /* # of filestreams active in this AG */
 324
 325         spinlock_t      pag_ici_lock;   /* incore inode cache lock */
 326         struct radix_tree_root pag_ici_root;    /* incore inode cache root */
 327         int             pag_ici_reclaimable;    /* reclaimable inodes */
 328         struct mutex    pag_ici_reclaim_lock;   /* serialisation point */
 329         unsigned long   pag_ici_reclaim_cursor; /* reclaim restart point */
 330
 331         /* buffer cache index */
 332         spinlock_t      pag_buf_lock;   /* lock for pag_buf_tree */
 333         struct rb_root  pag_buf_tree;   /* ordered tree of active buffers */
 334
 335         /* for rcu-safe freeing */
 336         struct rcu_head rcu_head;
 337         int             pagb_count;     /* pagb slots in use */
 338 } xfs_perag_t;
 339
 340 extern void     xfs_uuid_table_free(void);
 341 extern int      xfs_log_sbcount(xfs_mount_t *);
 342 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
 343 extern int      xfs_mountfs(xfs_mount_t *mp);
 344 extern int      xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
 345                                      xfs_agnumber_t *maxagi);
 346 extern void     xfs_unmountfs(xfs_mount_t *);
 347
 348 extern int      xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
 349 extern int      xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
 350 extern int      xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
 351                                  bool reserved);
 352 extern int      xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
 353
 354 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
 355 extern int      xfs_readsb(xfs_mount_t *, int);
 356 extern void     xfs_freesb(xfs_mount_t *);
 357 extern bool     xfs_fs_writable(struct xfs_mount *mp, int level);
 358 extern int      xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
 359
 360 extern int      xfs_dev_is_read_only(struct xfs_mount *, char *);
 361
 362 extern void     xfs_set_low_space_thresholds(struct xfs_mount *);
 363
 364 int     xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
 365                         xfs_off_t count_fsb);
 366
 367 #endif  /* __XFS_MOUNT_H__ */