#include <linux/kthread.h>
#include <linux/freezer.h>
-/*
- * xfs_sync flushes any pending I/O to file system vfsp.
- *
- * This routine is called by vfs_sync() to make sure that things make it
- * out to disk eventually, on sync() system calls to flush out everything,
- * and when the file system is unmounted. For the vfs_sync() case, all
- * we really need to do is sync out the log to make all of our meta-data
- * updates permanent (except for timestamps). For calls from pflushd(),
- * dirty pages are kept moving by calling pdflush() on the inodes
- * containing them. We also flush the inodes that we can lock without
- * sleeping and the superblock if we can lock it without sleeping from
- * vfs_sync() so that items at the tail of the log are always moving out.
- *
- * Flags:
- * SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
- * to sleep if we can help it. All we really need
- * to do is ensure that the log is synced at least
- * periodically. We also push the inodes and
- * superblock if we can lock them without sleeping
- * and they are not pinned.
- * SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not
- * set, then we really want to lock each inode and flush
- * it.
- * SYNC_WAIT - All the flushes that take place in this call should
- * be synchronous.
- * SYNC_DELWRI - This tells us to push dirty pages associated with
- * inodes. SYNC_WAIT and SYNC_BDFLUSH are used to
- * determine if they should be flushed sync, async, or
- * delwri.
- * SYNC_CLOSE - This flag is passed when the system is being
- * unmounted. We should sync and invalidate everything.
- * SYNC_FSDATA - This indicates that the caller would like to make
- * sure the superblock is safe on disk. We can ensure
- * this by simply making sure the log gets flushed
- * if SYNC_BDFLUSH is set, and by actually writing it
- * out otherwise.
- * SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete
- * before we return (including direct I/O). Forms the drain
- * side of the write barrier needed to safely quiesce the
- * filesystem.
- *
- */
-int
-xfs_sync(
- xfs_mount_t *mp,
- int flags)
-{
- int error;
-
- /*
- * Get the Quota Manager to flush the dquots.
- *
- * If XFS quota support is not enabled or this filesystem
- * instance does not use quotas XFS_QM_DQSYNC will always
- * return zero.
- */
- error = XFS_QM_DQSYNC(mp, flags);
- if (error) {
- /*
- * If we got an IO error, we will be shutting down.
- * So, there's nothing more for us to do here.
- */
- ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(error);
- }
-
- if (flags & SYNC_IOWAIT)
- xfs_filestream_flush(mp);
-
- return xfs_syncsub(mp, flags);
-}
-
/*
* Sync all the inodes in the given AG according to the
* direction given by the flags.
}
/*
- * xfs sync routine for internal use
+ * xfs_sync flushes any pending I/O to file system vfsp.
*
- * This routine supports all of the flags defined for the generic vfs_sync
- * interface as explained above under xfs_sync.
+ * This routine is called by vfs_sync() to make sure that things make it
+ * out to disk eventually, on sync() system calls to flush out everything,
+ * and when the file system is unmounted. For the vfs_sync() case, all
+ * we really need to do is sync out the log to make all of our meta-data
+ * updates permanent (except for timestamps). For calls from pflushd(),
+ * dirty pages are kept moving by calling pdflush() on the inodes
+ * containing them. We also flush the inodes that we can lock without
+ * sleeping and the superblock if we can lock it without sleeping from
+ * vfs_sync() so that items at the tail of the log are always moving out.
+ *
+ * Flags:
+ * SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want
+ * to sleep if we can help it. All we really need
+ * to do is ensure that the log is synced at least
+ * periodically. We also push the inodes and
+ * superblock if we can lock them without sleeping
+ * and they are not pinned.
+ * SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not
+ * set, then we really want to lock each inode and flush
+ * it.
+ * SYNC_WAIT - All the flushes that take place in this call should
+ * be synchronous.
+ * SYNC_DELWRI - This tells us to push dirty pages associated with
+ * inodes. SYNC_WAIT and SYNC_BDFLUSH are used to
+ * determine if they should be flushed sync, async, or
+ * delwri.
+ * SYNC_CLOSE - This flag is passed when the system is being
+ * unmounted. We should sync and invalidate everything.
+ * SYNC_FSDATA - This indicates that the caller would like to make
+ * sure the superblock is safe on disk. We can ensure
+ * this by simply making sure the log gets flushed
+ * if SYNC_BDFLUSH is set, and by actually writing it
+ * out otherwise.
+ * SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete
+ * before we return (including direct I/O). Forms the drain
+ * side of the write barrier needed to safely quiesce the
+ * filesystem.
*
*/
-STATIC int
-xfs_syncsub(
+int
+xfs_sync(
xfs_mount_t *mp,
int flags)
{
- int error = 0;
+ int error;
int last_error = 0;
uint log_flags = XFS_LOG_FORCE;
+ /*
+ * Get the Quota Manager to flush the dquots.
+ *
+ * If XFS quota support is not enabled or this filesystem
+ * instance does not use quotas XFS_QM_DQSYNC will always
+ * return zero.
+ */
+ error = XFS_QM_DQSYNC(mp, flags);
+ if (error) {
+ /*
+ * If we got an IO error, we will be shutting down.
+ * So, there's nothing more for us to do here.
+ */
+ ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(error);
+ }
+
+ if (flags & SYNC_IOWAIT)
+ xfs_filestream_flush(mp);
+
/*
* Sync out the log. This ensures that the log is periodically
* flushed even if there is not enough activity to fill it up.
projects / linux-beck.git / commitdiff