diff options
author | merge <null@invalid> | 2009-01-22 13:55:32 +0000 |
---|---|---|
committer | Andy Green <agreen@octopus.localdomain> | 2009-01-22 13:55:32 +0000 |
commit | aa6f5ffbdba45aa8e19e5048648fc6c7b25376d3 (patch) | |
tree | fbb786d0ac6f8a774fd834e9ce951197e60fbffa /fs/xfs/xfs_trans_priv.h | |
parent | f2d78193eae5dccd3d588d2c8ea0866efc368332 (diff) |
MERGE-via-pending-tracking-hist-MERGE-via-stable-tracking-MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040-1232632141
pending-tracking-hist top was MERGE-via-stable-tracking-MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040-1232632141 / fdf777a63bcb59e0dfd78bfe2c6242e01f6d4eb9 ... parent commitmessage:
From: merge <null@invalid>
MERGE-via-stable-tracking-hist-MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040
stable-tracking-hist top was MERGE-via-mokopatches-tracking-fix-stray-endmenu-patch-1232632040 / 90463bfd2d5a3c8b52f6e6d71024a00e052b0ced ... parent commitmessage:
From: merge <null@invalid>
MERGE-via-mokopatches-tracking-hist-fix-stray-endmenu-patch
mokopatches-tracking-hist top was fix-stray-endmenu-patch / 3630e0be570de8057e7f8d2fe501ed353cdf34e6 ... parent commitmessage:
From: Andy Green <andy@openmoko.com>
fix-stray-endmenu.patch
Signed-off-by: Andy Green <andy@openmoko.com>
Diffstat (limited to 'fs/xfs/xfs_trans_priv.h')
-rw-r--r-- | fs/xfs/xfs_trans_priv.h | 98 |
1 files changed, 83 insertions, 15 deletions
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h index 3c748c456ed..73e2ad39743 100644 --- a/fs/xfs/xfs_trans_priv.h +++ b/fs/xfs/xfs_trans_priv.h @@ -44,25 +44,93 @@ xfs_log_busy_slot_t *xfs_trans_add_busy(xfs_trans_t *tp, xfs_extlen_t idx); /* - * From xfs_trans_ail.c + * AIL traversal cursor. + * + * Rather than using a generation number for detecting changes in the ail, use + * a cursor that is protected by the ail lock. The aild cursor exists in the + * struct xfs_ail, but other traversals can declare it on the stack and link it + * to the ail list. + * + * When an object is deleted from or moved int the AIL, the cursor list is + * searched to see if the object is a designated cursor item. If it is, it is + * deleted from the cursor so that the next time the cursor is used traversal + * will return to the start. + * + * This means a traversal colliding with a removal will cause a restart of the + * list scan, rather than any insertion or deletion anywhere in the list. The + * low bit of the item pointer is set if the cursor has been invalidated so + * that we can tell the difference between invalidation and reaching the end + * of the list to trigger traversal restarts. */ -void xfs_trans_update_ail(struct xfs_mount *mp, - struct xfs_log_item *lip, xfs_lsn_t lsn) - __releases(mp->m_ail_lock); -void xfs_trans_delete_ail(struct xfs_mount *mp, - struct xfs_log_item *lip) - __releases(mp->m_ail_lock); -struct xfs_log_item *xfs_trans_first_ail(struct xfs_mount *, int *); -struct xfs_log_item *xfs_trans_next_ail(struct xfs_mount *, - struct xfs_log_item *, int *, int *); +struct xfs_ail_cursor { + struct xfs_ail_cursor *next; + struct xfs_log_item *item; +}; +/* + * Private AIL structures. + * + * Eventually we need to drive the locking in here as well. + */ +struct xfs_ail { + struct xfs_mount *xa_mount; + struct list_head xa_ail; + uint xa_gen; + struct task_struct *xa_task; + xfs_lsn_t xa_target; + struct xfs_ail_cursor xa_cursors; + spinlock_t xa_lock; +}; /* - * AIL push thread support + * From xfs_trans_ail.c */ -long xfsaild_push(struct xfs_mount *, xfs_lsn_t *); -void xfsaild_wakeup(struct xfs_mount *, xfs_lsn_t); -int xfsaild_start(struct xfs_mount *); -void xfsaild_stop(struct xfs_mount *); +void xfs_trans_ail_update(struct xfs_ail *ailp, + struct xfs_log_item *lip, xfs_lsn_t lsn) + __releases(ailp->xa_lock); +void xfs_trans_ail_delete(struct xfs_ail *ailp, + struct xfs_log_item *lip) + __releases(ailp->xa_lock); +void xfs_trans_ail_push(struct xfs_ail *, xfs_lsn_t); +void xfs_trans_unlocked_item(struct xfs_ail *, + xfs_log_item_t *); + +xfs_lsn_t xfs_trans_ail_tail(struct xfs_ail *ailp); + +struct xfs_log_item *xfs_trans_ail_cursor_first(struct xfs_ail *ailp, + struct xfs_ail_cursor *cur, + xfs_lsn_t lsn); +struct xfs_log_item *xfs_trans_ail_cursor_next(struct xfs_ail *ailp, + struct xfs_ail_cursor *cur); +void xfs_trans_ail_cursor_done(struct xfs_ail *ailp, + struct xfs_ail_cursor *cur); + +long xfsaild_push(struct xfs_ail *, xfs_lsn_t *); +void xfsaild_wakeup(struct xfs_ail *, xfs_lsn_t); +int xfsaild_start(struct xfs_ail *); +void xfsaild_stop(struct xfs_ail *); +#if BITS_PER_LONG != 64 +static inline void +xfs_trans_ail_copy_lsn( + struct xfs_ail *ailp, + xfs_lsn_t *dst, + xfs_lsn_t *src) +{ + ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */ + spin_lock(&ailp->xa_lock); + *dst = *src; + spin_unlock(&ailp->xa_lock); +} +#else +static inline void +xfs_trans_ail_copy_lsn( + struct xfs_ail *ailp, + xfs_lsn_t *dst, + xfs_lsn_t *src) +{ + ASSERT(sizeof(xfs_lsn_t) == 8); + *dst = *src; +} +#endif #endif /* __XFS_TRANS_PRIV_H__ */ |