jbd2: add errseq to detect client fs's bdev writeback error

[linux-2.6-microblaze.git] / include / linux / jbd2.h

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index beb3071..cea1aa7 100644 (file)
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -998,6 +998,13 @@ struct journal_s
         */
        struct block_device     *j_fs_dev;
 
+       /**
+        * @j_fs_dev_wb_err:
+        *
+        * Records the errseq of the client fs's backing block device.
+        */
+       errseq_t                j_fs_dev_wb_err;
+
        /**
         * @j_total_len: Total maximum capacity of the journal region on disk.
         */
@@ -1698,6 +1705,25 @@ static inline void jbd2_journal_abort_handle(handle_t *handle)
        handle->h_aborted = 1;
 }
 
+static inline void jbd2_init_fs_dev_write_error(journal_t *journal)
+{
+       struct address_space *mapping = journal->j_fs_dev->bd_inode->i_mapping;
+
+       /*
+        * Save the original wb_err value of client fs's bdev mapping which
+        * could be used to detect the client fs's metadata async write error.
+        */
+       errseq_check_and_advance(&mapping->wb_err, &journal->j_fs_dev_wb_err);
+}
+
+static inline int jbd2_check_fs_dev_write_error(journal_t *journal)
+{
+       struct address_space *mapping = journal->j_fs_dev->bd_inode->i_mapping;
+
+       return errseq_check(&mapping->wb_err,
+                           READ_ONCE(journal->j_fs_dev_wb_err));
+}
+
 #endif /* __KERNEL__   */
 
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