btrfs: properly track when rescan worker is running

[cascardo/linux.git] / fs / xfs / xfs_buf.h

diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 4eb89bd..8bfb974 100644 (file)
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -183,6 +183,26 @@ typedef struct xfs_buf {
        unsigned int            b_page_count;   /* size of page array */
        unsigned int            b_offset;       /* page offset in first page */
        int                     b_error;        /* error code on I/O */
+
+       /*
+        * async write failure retry count. Initialised to zero on the first
+        * failure, then when it exceeds the maximum configured without a
+        * success the write is considered to be failed permanently and the
+        * iodone handler will take appropriate action.
+        *
+        * For retry timeouts, we record the jiffie of the first failure. This
+        * means that we can change the retry timeout for buffers already under
+        * I/O and thus avoid getting stuck in a retry loop with a long timeout.
+        *
+        * last_error is used to ensure that we are getting repeated errors, not
+        * different errors. e.g. a block device might change ENOSPC to EIO when
+        * a failure timeout occurs, so we want to re-initialise the error
+        * retry behaviour appropriately when that happens.
+        */
+       int                     b_retries;
+       unsigned long           b_first_retry_time; /* in jiffies */
+       int                     b_last_error;
+
        const struct xfs_buf_ops        *b_ops;
 
 #ifdef XFS_BUF_LOCK_TRACKING