368 строки
14 KiB
C
368 строки
14 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_MOUNT_H__
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#define __XFS_MOUNT_H__
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struct xlog;
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struct xfs_inode;
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struct xfs_mru_cache;
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struct xfs_nameops;
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struct xfs_ail;
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struct xfs_quotainfo;
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struct xfs_dir_ops;
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struct xfs_da_geometry;
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/* dynamic preallocation free space thresholds, 5% down to 1% */
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enum {
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XFS_LOWSP_1_PCNT = 0,
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XFS_LOWSP_2_PCNT,
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XFS_LOWSP_3_PCNT,
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XFS_LOWSP_4_PCNT,
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XFS_LOWSP_5_PCNT,
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XFS_LOWSP_MAX,
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};
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typedef struct xfs_mount {
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struct super_block *m_super;
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xfs_tid_t m_tid; /* next unused tid for fs */
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struct xfs_ail *m_ail; /* fs active log item list */
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struct xfs_sb m_sb; /* copy of fs superblock */
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spinlock_t m_sb_lock; /* sb counter lock */
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struct percpu_counter m_icount; /* allocated inodes counter */
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struct percpu_counter m_ifree; /* free inodes counter */
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struct percpu_counter m_fdblocks; /* free block counter */
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struct xfs_buf *m_sb_bp; /* buffer for superblock */
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char *m_fsname; /* filesystem name */
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int m_fsname_len; /* strlen of fs name */
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char *m_rtname; /* realtime device name */
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char *m_logname; /* external log device name */
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int m_bsize; /* fs logical block size */
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xfs_agnumber_t m_agfrotor; /* last ag where space found */
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xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
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spinlock_t m_agirotor_lock;/* .. and lock protecting it */
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xfs_agnumber_t m_maxagi; /* highest inode alloc group */
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uint m_readio_log; /* min read size log bytes */
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uint m_readio_blocks; /* min read size blocks */
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uint m_writeio_log; /* min write size log bytes */
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uint m_writeio_blocks; /* min write size blocks */
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struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
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struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
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struct xlog *m_log; /* log specific stuff */
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int m_logbufs; /* number of log buffers */
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int m_logbsize; /* size of each log buffer */
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uint m_rsumlevels; /* rt summary levels */
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uint m_rsumsize; /* size of rt summary, bytes */
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struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
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struct xfs_inode *m_rsumip; /* pointer to summary inode */
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struct xfs_inode *m_rootip; /* pointer to root directory */
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struct xfs_quotainfo *m_quotainfo; /* disk quota information */
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xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
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xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
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xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
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__uint8_t m_blkbit_log; /* blocklog + NBBY */
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__uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
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__uint8_t m_agno_log; /* log #ag's */
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__uint8_t m_agino_log; /* #bits for agino in inum */
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uint m_inode_cluster_size;/* min inode buf size */
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uint m_blockmask; /* sb_blocksize-1 */
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uint m_blockwsize; /* sb_blocksize in words */
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uint m_blockwmask; /* blockwsize-1 */
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uint m_alloc_mxr[2]; /* max alloc btree records */
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uint m_alloc_mnr[2]; /* min alloc btree records */
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uint m_bmap_dmxr[2]; /* max bmap btree records */
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uint m_bmap_dmnr[2]; /* min bmap btree records */
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uint m_inobt_mxr[2]; /* max inobt btree records */
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uint m_inobt_mnr[2]; /* min inobt btree records */
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uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
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uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
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uint m_in_maxlevels; /* max inobt btree levels. */
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struct radix_tree_root m_perag_tree; /* per-ag accounting info */
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spinlock_t m_perag_lock; /* lock for m_perag_tree */
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struct mutex m_growlock; /* growfs mutex */
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int m_fixedfsid[2]; /* unchanged for life of FS */
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uint m_dmevmask; /* DMI events for this FS */
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__uint64_t m_flags; /* global mount flags */
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int m_ialloc_inos; /* inodes in inode allocation */
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int m_ialloc_blks; /* blocks in inode allocation */
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int m_ialloc_min_blks;/* min blocks in sparse inode
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* allocation */
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int m_inoalign_mask;/* mask sb_inoalignmt if used */
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uint m_qflags; /* quota status flags */
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struct xfs_trans_resv m_resv; /* precomputed res values */
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__uint64_t m_maxicount; /* maximum inode count */
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__uint64_t m_resblks; /* total reserved blocks */
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__uint64_t m_resblks_avail;/* available reserved blocks */
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__uint64_t m_resblks_save; /* reserved blks @ remount,ro */
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int m_dalign; /* stripe unit */
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int m_swidth; /* stripe width */
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int m_sinoalign; /* stripe unit inode alignment */
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__uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
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const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
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const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
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const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
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uint m_chsize; /* size of next field */
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atomic_t m_active_trans; /* number trans frozen */
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struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
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struct delayed_work m_reclaim_work; /* background inode reclaim */
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struct delayed_work m_eofblocks_work; /* background eof blocks
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trimming */
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bool m_update_sb; /* sb needs update in mount */
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int64_t m_low_space[XFS_LOWSP_MAX];
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/* low free space thresholds */
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struct xfs_kobj m_kobj;
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struct xstats m_stats; /* per-fs stats */
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struct workqueue_struct *m_buf_workqueue;
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struct workqueue_struct *m_data_workqueue;
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struct workqueue_struct *m_unwritten_workqueue;
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struct workqueue_struct *m_cil_workqueue;
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struct workqueue_struct *m_reclaim_workqueue;
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struct workqueue_struct *m_log_workqueue;
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struct workqueue_struct *m_eofblocks_workqueue;
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/*
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* Generation of the filesysyem layout. This is incremented by each
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* growfs, and used by the pNFS server to ensure the client updates
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* its view of the block device once it gets a layout that might
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* reference the newly added blocks. Does not need to be persistent
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* as long as we only allow file system size increments, but if we
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* ever support shrinks it would have to be persisted in addition
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* to various other kinds of pain inflicted on the pNFS server.
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*/
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__uint32_t m_generation;
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#ifdef DEBUG
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/*
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* DEBUG mode instrumentation to test and/or trigger delayed allocation
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* block killing in the event of failed writes. When enabled, all
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* buffered writes are forced to fail. All delalloc blocks in the range
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* of the write (including pre-existing delalloc blocks!) are tossed as
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* part of the write failure error handling sequence.
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*/
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bool m_fail_writes;
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#endif
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} xfs_mount_t;
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/*
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* Flags for m_flags.
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*/
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#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
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must be synchronous except
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for space allocations */
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#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
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#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
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operations, typically for
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disk errors in metadata */
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#define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
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#define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
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allocations */
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#define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
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#define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
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#define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
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#define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
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#define XFS_MOUNT_SMALL_INUMS (1ULL << 14) /* user wants 32bit inodes */
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#define XFS_MOUNT_32BITINODES (1ULL << 15) /* inode32 allocator active */
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#define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
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#define XFS_MOUNT_BARRIER (1ULL << 17)
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#define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
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#define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
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* allocation */
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#define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
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#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
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#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
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* I/O size in stat() */
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#define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
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allocator */
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#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
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#define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */
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/*
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* Default minimum read and write sizes.
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*/
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#define XFS_READIO_LOG_LARGE 16
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#define XFS_WRITEIO_LOG_LARGE 16
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/*
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* Max and min values for mount-option defined I/O
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* preallocation sizes.
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*/
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#define XFS_MAX_IO_LOG 30 /* 1G */
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#define XFS_MIN_IO_LOG PAGE_SHIFT
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/*
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* Synchronous read and write sizes. This should be
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* better for NFSv2 wsync filesystems.
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*/
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#define XFS_WSYNC_READIO_LOG 15 /* 32k */
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#define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
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/*
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* Allow large block sizes to be reported to userspace programs if the
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* "largeio" mount option is used.
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*
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* If compatibility mode is specified, simply return the basic unit of caching
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* so that we don't get inefficient read/modify/write I/O from user apps.
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* Otherwise....
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*
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* If the underlying volume is a stripe, then return the stripe width in bytes
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* as the recommended I/O size. It is not a stripe and we've set a default
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* buffered I/O size, return that, otherwise return the compat default.
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*/
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static inline unsigned long
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xfs_preferred_iosize(xfs_mount_t *mp)
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{
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if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
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return PAGE_SIZE;
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return (mp->m_swidth ?
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(mp->m_swidth << mp->m_sb.sb_blocklog) :
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((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
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(1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
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PAGE_SIZE));
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}
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#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
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((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
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#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
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void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
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int lnnum);
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#define xfs_force_shutdown(m,f) \
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xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
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#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
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#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
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#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
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#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
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#define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
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#define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
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/*
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* Flags for xfs_mountfs
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*/
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#define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
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static inline xfs_agnumber_t
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xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
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{
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xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
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do_div(ld, mp->m_sb.sb_agblocks);
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return (xfs_agnumber_t) ld;
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}
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static inline xfs_agblock_t
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xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
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{
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xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
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return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
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}
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#ifdef DEBUG
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static inline bool
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xfs_mp_fail_writes(struct xfs_mount *mp)
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{
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return mp->m_fail_writes;
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}
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#else
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static inline bool
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xfs_mp_fail_writes(struct xfs_mount *mp)
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{
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return 0;
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}
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#endif
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/*
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* Per-ag incore structure, copies of information in agf and agi, to improve the
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* performance of allocation group selection.
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*/
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typedef struct xfs_perag {
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struct xfs_mount *pag_mount; /* owner filesystem */
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xfs_agnumber_t pag_agno; /* AG this structure belongs to */
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atomic_t pag_ref; /* perag reference count */
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char pagf_init; /* this agf's entry is initialized */
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char pagi_init; /* this agi's entry is initialized */
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char pagf_metadata; /* the agf is preferred to be metadata */
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char pagi_inodeok; /* The agi is ok for inodes */
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__uint8_t pagf_levels[XFS_BTNUM_AGF];
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/* # of levels in bno & cnt btree */
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__uint32_t pagf_flcount; /* count of blocks in freelist */
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xfs_extlen_t pagf_freeblks; /* total free blocks */
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xfs_extlen_t pagf_longest; /* longest free space */
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__uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
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xfs_agino_t pagi_freecount; /* number of free inodes */
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xfs_agino_t pagi_count; /* number of allocated inodes */
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/*
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* Inode allocation search lookup optimisation.
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* If the pagino matches, the search for new inodes
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* doesn't need to search the near ones again straight away
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*/
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xfs_agino_t pagl_pagino;
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xfs_agino_t pagl_leftrec;
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xfs_agino_t pagl_rightrec;
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spinlock_t pagb_lock; /* lock for pagb_tree */
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struct rb_root pagb_tree; /* ordered tree of busy extents */
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atomic_t pagf_fstrms; /* # of filestreams active in this AG */
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spinlock_t pag_ici_lock; /* incore inode cache lock */
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struct radix_tree_root pag_ici_root; /* incore inode cache root */
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int pag_ici_reclaimable; /* reclaimable inodes */
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struct mutex pag_ici_reclaim_lock; /* serialisation point */
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unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
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/* buffer cache index */
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spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
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struct rb_root pag_buf_tree; /* ordered tree of active buffers */
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/* for rcu-safe freeing */
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struct rcu_head rcu_head;
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int pagb_count; /* pagb slots in use */
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} xfs_perag_t;
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extern void xfs_uuid_table_free(void);
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extern int xfs_log_sbcount(xfs_mount_t *);
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extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
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extern int xfs_mountfs(xfs_mount_t *mp);
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extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
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xfs_agnumber_t *maxagi);
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extern void xfs_unmountfs(xfs_mount_t *);
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extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
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extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
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extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
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bool reserved);
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extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
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extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
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extern int xfs_readsb(xfs_mount_t *, int);
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extern void xfs_freesb(xfs_mount_t *);
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extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
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extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
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extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
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extern void xfs_set_low_space_thresholds(struct xfs_mount *);
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int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
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xfs_off_t count_fsb);
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#endif /* __XFS_MOUNT_H__ */
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