long retry_timeout; /* in jiffies, -1 = infinite */
};
+/*
+ * The struct xfsmount layout is optimised to separate read-mostly variables
+ * from variables that are frequently modified. We put the read-mostly variables
+ * first, then place all the other variables at the end.
+ *
+ * Typically, read-mostly variables are those that are set at mount time and
+ * never changed again, or only change rarely as a result of things like sysfs
+ * knobs being tweaked.
+ */
typedef struct xfs_mount {
+ struct xfs_sb m_sb; /* copy of fs superblock */
struct super_block *m_super;
-
- /*
- * Bitsets of per-fs metadata that have been checked and/or are sick.
- * Callers must hold m_sb_lock to access these two fields.
- */
- uint8_t m_fs_checked;
- uint8_t m_fs_sick;
- /*
- * Bitsets of rt metadata that have been checked and/or are sick.
- * Callers must hold m_sb_lock to access this field.
- */
- uint8_t m_rt_checked;
- uint8_t m_rt_sick;
-
struct xfs_ail *m_ail; /* fs active log item list */
-
- struct xfs_sb m_sb; /* copy of fs superblock */
- spinlock_t m_sb_lock; /* sb counter lock */
- struct percpu_counter m_icount; /* allocated inodes counter */
- struct percpu_counter m_ifree; /* free inodes counter */
- struct percpu_counter m_fdblocks; /* free block counter */
- /*
- * Count of data device blocks reserved for delayed allocations,
- * including indlen blocks. Does not include allocated CoW staging
- * extents or anything related to the rt device.
- */
- struct percpu_counter m_delalloc_blks;
-
struct xfs_buf *m_sb_bp; /* buffer for superblock */
char *m_rtname; /* realtime device name */
char *m_logname; /* external log device name */
- int m_bsize; /* fs logical block size */
- xfs_agnumber_t m_agfrotor; /* last ag where space found */
- xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
- spinlock_t m_agirotor_lock;/* .. and lock protecting it */
- xfs_agnumber_t m_maxagi; /* highest inode alloc group */
- uint m_allocsize_log;/* min write size log bytes */
- uint m_allocsize_blocks; /* min write size blocks */
struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
struct xlog *m_log; /* log specific stuff */
- struct xfs_ino_geometry m_ino_geo; /* inode geometry */
- int m_logbufs; /* number of log buffers */
- int m_logbsize; /* size of each log buffer */
- uint m_rsumlevels; /* rt summary levels */
- uint m_rsumsize; /* size of rt summary, bytes */
- /*
- * Optional cache of rt summary level per bitmap block with the
- * invariant that m_rsum_cache[bbno] <= the minimum i for which
- * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
- * inode lock.
- */
- uint8_t *m_rsum_cache;
struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
struct xfs_inode *m_rsumip; /* pointer to summary inode */
struct xfs_inode *m_rootip; /* pointer to root directory */
xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
+ /*
+ * Optional cache of rt summary level per bitmap block with the
+ * invariant that m_rsum_cache[bbno] <= the minimum i for which
+ * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
+ * inode lock.
+ */
+ uint8_t *m_rsum_cache;
+ struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
+ struct workqueue_struct *m_buf_workqueue;
+ struct workqueue_struct *m_unwritten_workqueue;
+ struct workqueue_struct *m_cil_workqueue;
+ struct workqueue_struct *m_reclaim_workqueue;
+ struct workqueue_struct *m_eofblocks_workqueue;
+ struct workqueue_struct *m_sync_workqueue;
+
+ int m_bsize; /* fs logical block size */
uint8_t m_blkbit_log; /* blocklog + NBBY */
uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
uint8_t m_agno_log; /* log #ag's */
+ uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
uint m_blockmask; /* sb_blocksize-1 */
uint m_blockwsize; /* sb_blocksize in words */
uint m_blockwmask; /* blockwsize-1 */
xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
uint m_alloc_set_aside; /* space we can't use */
uint m_ag_max_usable; /* max space per AG */
- struct radix_tree_root m_perag_tree; /* per-ag accounting info */
- spinlock_t m_perag_lock; /* lock for m_perag_tree */
- struct mutex m_growlock; /* growfs mutex */
+ int m_dalign; /* stripe unit */
+ int m_swidth; /* stripe width */
+ xfs_agnumber_t m_maxagi; /* highest inode alloc group */
+ uint m_allocsize_log;/* min write size log bytes */
+ uint m_allocsize_blocks; /* min write size blocks */
+ int m_logbufs; /* number of log buffers */
+ int m_logbsize; /* size of each log buffer */
+ uint m_rsumlevels; /* rt summary levels */
+ uint m_rsumsize; /* size of rt summary, bytes */
int m_fixedfsid[2]; /* unchanged for life of FS */
- uint64_t m_flags; /* global mount flags */
- bool m_finobt_nores; /* no per-AG finobt resv. */
uint m_qflags; /* quota status flags */
+ uint64_t m_flags; /* global mount flags */
+ int64_t m_low_space[XFS_LOWSP_MAX];
+ struct xfs_ino_geometry m_ino_geo; /* inode geometry */
struct xfs_trans_resv m_resv; /* precomputed res values */
+ /* low free space thresholds */
+ bool m_always_cow;
+ bool m_fail_unmount;
+ bool m_finobt_nores; /* no per-AG finobt resv. */
+ bool m_update_sb; /* sb needs update in mount */
+
+ /*
+ * Bitsets of per-fs metadata that have been checked and/or are sick.
+ * Callers must hold m_sb_lock to access these two fields.
+ */
+ uint8_t m_fs_checked;
+ uint8_t m_fs_sick;
+ /*
+ * Bitsets of rt metadata that have been checked and/or are sick.
+ * Callers must hold m_sb_lock to access this field.
+ */
+ uint8_t m_rt_checked;
+ uint8_t m_rt_sick;
+
+ /*
+ * End of read-mostly variables. Frequently written variables and locks
+ * should be placed below this comment from now on. The first variable
+ * here is marked as cacheline aligned so they it is separated from
+ * the read-mostly variables.
+ */
+
+ spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */
+ struct percpu_counter m_icount; /* allocated inodes counter */
+ struct percpu_counter m_ifree; /* free inodes counter */
+ struct percpu_counter m_fdblocks; /* free block counter */
+ /*
+ * Count of data device blocks reserved for delayed allocations,
+ * including indlen blocks. Does not include allocated CoW staging
+ * extents or anything related to the rt device.
+ */
+ struct percpu_counter m_delalloc_blks;
+
+ struct radix_tree_root m_perag_tree; /* per-ag accounting info */
+ spinlock_t m_perag_lock; /* lock for m_perag_tree */
uint64_t m_resblks; /* total reserved blocks */
uint64_t m_resblks_avail;/* available reserved blocks */
uint64_t m_resblks_save; /* reserved blks @ remount,ro */
- int m_dalign; /* stripe unit */
- int m_swidth; /* stripe width */
- uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
atomic_t m_active_trans; /* number trans frozen */
- struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
struct delayed_work m_reclaim_work; /* background inode reclaim */
struct delayed_work m_eofblocks_work; /* background eof blocks
trimming */
struct delayed_work m_cowblocks_work; /* background cow blocks
trimming */
- bool m_update_sb; /* sb needs update in mount */
- int64_t m_low_space[XFS_LOWSP_MAX];
- /* low free space thresholds */
struct xfs_kobj m_kobj;
struct xfs_kobj m_error_kobj;
struct xfs_kobj m_error_meta_kobj;
struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
struct xstats m_stats; /* per-fs stats */
+ xfs_agnumber_t m_agfrotor; /* last ag where space found */
+ xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
+ spinlock_t m_agirotor_lock;/* .. and lock protecting it */
/*
* Workqueue item so that we can coalesce multiple inode flush attempts
* into a single flush.
*/
struct work_struct m_flush_inodes_work;
- struct workqueue_struct *m_buf_workqueue;
- struct workqueue_struct *m_unwritten_workqueue;
- struct workqueue_struct *m_cil_workqueue;
- struct workqueue_struct *m_reclaim_workqueue;
- struct workqueue_struct *m_eofblocks_workqueue;
- struct workqueue_struct *m_sync_workqueue;
/*
* Generation of the filesysyem layout. This is incremented by each
* to various other kinds of pain inflicted on the pNFS server.
*/
uint32_t m_generation;
+ struct mutex m_growlock; /* growfs mutex */
- bool m_always_cow;
- bool m_fail_unmount;
#ifdef DEBUG
/*
* Frequency with which errors are injected. Replaces xfs_etest; the