#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_log.h"
+#include "xfs_log_priv.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include <linux/kthread.h>
#include <linux/freezer.h>
-struct workqueue_struct *xfs_syncd_wq; /* sync workqueue */
-
/*
* The inode lookup is done in batches to keep the amount of lock traffic and
* radix tree lookups to a minimum. The batch size is a trade off between
return XFS_ERROR(last_error);
}
-STATIC int
-xfs_sync_inode_data(
- struct xfs_inode *ip,
- struct xfs_perag *pag,
- int flags)
-{
- struct inode *inode = VFS_I(ip);
- struct address_space *mapping = inode->i_mapping;
- int error = 0;
-
- if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
- return 0;
-
- if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)) {
- if (flags & SYNC_TRYLOCK)
- return 0;
- xfs_ilock(ip, XFS_IOLOCK_SHARED);
- }
-
- error = xfs_flush_pages(ip, 0, -1, (flags & SYNC_WAIT) ?
- 0 : XBF_ASYNC, FI_NONE);
- xfs_iunlock(ip, XFS_IOLOCK_SHARED);
- return error;
-}
-
-/*
- * Write out pagecache data for the whole filesystem.
- */
-STATIC int
-xfs_sync_data(
- struct xfs_mount *mp,
- int flags)
-{
- int error;
-
- ASSERT((flags & ~(SYNC_TRYLOCK|SYNC_WAIT)) == 0);
-
- error = xfs_inode_ag_iterator(mp, xfs_sync_inode_data, flags);
- if (error)
- return XFS_ERROR(error);
-
- xfs_log_force(mp, (flags & SYNC_WAIT) ? XFS_LOG_SYNC : 0);
- return 0;
-}
-
STATIC int
xfs_sync_fsdata(
struct xfs_mount *mp)
* Second stage of a quiesce. The data is already synced, now we have to take
* care of the metadata. New transactions are already blocked, so we need to
* wait for any remaining transactions to drain out before proceeding.
+ *
+ * Note: this stops background sync work - the callers must ensure it is started
+ * again when appropriate.
*/
void
xfs_quiesce_attr(
/* flush all pending changes from the AIL */
xfs_ail_push_all_sync(mp->m_ail);
+ /* stop background log work */
+ cancel_delayed_work_sync(&mp->m_log->l_work);
+
/*
* Just warn here till VFS can correctly support
* read-only remount without racing.
xfs_buf_unlock(mp->m_sb_bp);
}
-static void
-xfs_syncd_queue_sync(
- struct xfs_mount *mp)
-{
- queue_delayed_work(xfs_syncd_wq, &mp->m_sync_work,
- msecs_to_jiffies(xfs_syncd_centisecs * 10));
-}
-
-/*
- * Every sync period we need to unpin all items, reclaim inodes and sync
- * disk quotas. We might need to cover the log to indicate that the
- * filesystem is idle and not frozen.
- */
-STATIC void
-xfs_sync_worker(
- struct work_struct *work)
-{
- struct xfs_mount *mp = container_of(to_delayed_work(work),
- struct xfs_mount, m_sync_work);
- int error;
-
- /*
- * We shouldn't write/force the log if we are in the mount/unmount
- * process or on a read only filesystem. The workqueue still needs to be
- * active in both cases, however, because it is used for inode reclaim
- * during these times. Use the MS_ACTIVE flag to avoid doing anything
- * during mount. Doing work during unmount is avoided by calling
- * cancel_delayed_work_sync on this work queue before tearing down
- * the ail and the log in xfs_log_unmount.
- */
- if (!(mp->m_super->s_flags & MS_ACTIVE) &&
- !(mp->m_flags & XFS_MOUNT_RDONLY)) {
- /* dgc: errors ignored here */
- if (mp->m_super->s_writers.frozen == SB_UNFROZEN &&
- xfs_log_need_covered(mp))
- error = xfs_fs_log_dummy(mp);
- else
- xfs_log_force(mp, 0);
-
- /* start pushing all the metadata that is currently
- * dirty */
- xfs_ail_push_all(mp->m_ail);
- }
-
- /* queue us up again */
- xfs_syncd_queue_sync(mp);
-}
-
/*
* Queue a new inode reclaim pass if there are reclaimable inodes and there
* isn't a reclaim pass already in progress. By default it runs every 5s based
- * on the xfs syncd work default of 30s. Perhaps this should have it's own
+ * on the xfs periodic sync default of 30s. Perhaps this should have it's own
* tunable, but that can be done if this method proves to be ineffective or too
* aggressive.
*/
static void
-xfs_syncd_queue_reclaim(
+xfs_reclaim_work_queue(
struct xfs_mount *mp)
{
rcu_read_lock();
if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
- queue_delayed_work(xfs_syncd_wq, &mp->m_reclaim_work,
+ queue_delayed_work(mp->m_reclaim_workqueue, &mp->m_reclaim_work,
msecs_to_jiffies(xfs_syncd_centisecs / 6 * 10));
}
rcu_read_unlock();
* goes low. It scans as quickly as possible avoiding locked inodes or those
* already being flushed, and once done schedules a future pass.
*/
-STATIC void
+void
xfs_reclaim_worker(
struct work_struct *work)
{
struct xfs_mount, m_reclaim_work);
xfs_reclaim_inodes(mp, SYNC_TRYLOCK);
- xfs_syncd_queue_reclaim(mp);
-}
-
-/*
- * Flush delayed allocate data, attempting to free up reserved space
- * from existing allocations. At this point a new allocation attempt
- * has failed with ENOSPC and we are in the process of scratching our
- * heads, looking about for more room.
- *
- * Queue a new data flush if there isn't one already in progress and
- * wait for completion of the flush. This means that we only ever have one
- * inode flush in progress no matter how many ENOSPC events are occurring and
- * so will prevent the system from bogging down due to every concurrent
- * ENOSPC event scanning all the active inodes in the system for writeback.
- */
-void
-xfs_flush_inodes(
- struct xfs_inode *ip)
-{
- struct xfs_mount *mp = ip->i_mount;
-
- queue_work(xfs_syncd_wq, &mp->m_flush_work);
- flush_work(&mp->m_flush_work);
-}
-
-STATIC void
-xfs_flush_worker(
- struct work_struct *work)
-{
- struct xfs_mount *mp = container_of(work,
- struct xfs_mount, m_flush_work);
-
- xfs_sync_data(mp, SYNC_TRYLOCK);
- xfs_sync_data(mp, SYNC_TRYLOCK | SYNC_WAIT);
-}
-
-int
-xfs_syncd_init(
- struct xfs_mount *mp)
-{
- INIT_WORK(&mp->m_flush_work, xfs_flush_worker);
- INIT_DELAYED_WORK(&mp->m_sync_work, xfs_sync_worker);
- INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
-
- xfs_syncd_queue_sync(mp);
-
- return 0;
-}
-
-void
-xfs_syncd_stop(
- struct xfs_mount *mp)
-{
- cancel_delayed_work_sync(&mp->m_sync_work);
- cancel_delayed_work_sync(&mp->m_reclaim_work);
- cancel_work_sync(&mp->m_flush_work);
+ xfs_reclaim_work_queue(mp);
}
void
spin_unlock(&ip->i_mount->m_perag_lock);
/* schedule periodic background inode reclaim */
- xfs_syncd_queue_reclaim(ip->i_mount);
+ xfs_reclaim_work_queue(ip->i_mount);
trace_xfs_perag_set_reclaim(ip->i_mount, pag->pag_agno,
-1, _RET_IP_);
/*
* We could return EAGAIN here to make reclaim rescan the inode tree in
* a short while. However, this just burns CPU time scanning the tree
- * waiting for IO to complete and xfssyncd never goes back to the idle
- * state. Instead, return 0 to let the next scheduled background reclaim
- * attempt to reclaim the inode again.
+ * waiting for IO to complete and the reclaim work never goes back to
+ * the idle state. Instead, return 0 to let the next scheduled
+ * background reclaim attempt to reclaim the inode again.
*/
return 0;
}
int nr_to_scan)
{
/* kick background reclaimer and push the AIL */
- xfs_syncd_queue_reclaim(mp);
+ xfs_reclaim_work_queue(mp);
xfs_ail_push_all(mp->m_ail);
xfs_reclaim_inodes_ag(mp, SYNC_TRYLOCK | SYNC_WAIT, &nr_to_scan);
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