1 files changed, 18 insertions, 3 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 2c8f7b204617..01c21b6c6d43 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -20,6 +20,7 @@
 #include "volumes.h"
 #include "check-integrity.h"
 #include "locking.h"
+#include "rcu-string.h"
 
 static struct kmem_cache *extent_state_cache;
 static struct kmem_cache *extent_buffer_cache;
@@ -1917,9 +1918,9 @@ int repair_io_failure(struct btrfs_mapping_tree *map_tree, u64 start,
                 return -EIO;
         }
 
-        printk(KERN_INFO "btrfs read error corrected: ino %lu off %llu (dev %s "
-                        "sector %llu)\n", page->mapping->host->i_ino, start,
-                        dev->name, sector);
+        printk_in_rcu(KERN_INFO "btrfs read error corrected: ino %lu off %llu "
+                      "(dev %s sector %llu)\n", page->mapping->host->i_ino,
+                      start, rcu_str_deref(dev->name), sector);
 
         bio_put(bio);
         return 0;
@@ -3323,6 +3324,7 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
                              writepage_t writepage, void *data,
                              void (*flush_fn)(void *))
 {
+        struct inode *inode = mapping->host;
         int ret = 0;
         int done = 0;
         int nr_to_write_done = 0;
@@ -3333,6 +3335,18 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
         int scanned = 0;
         int tag;
 
+        /*
+         * We have to hold onto the inode so that ordered extents can do their
+         * work when the IO finishes.  The alternative to this is failing to add
+         * an ordered extent if the igrab() fails there and that is a huge pain
+         * to deal with, so instead just hold onto the inode throughout the
+         * writepages operation.  If it fails here we are freeing up the inode
+         * anyway and we'd rather not waste our time writing out stuff that is
+         * going to be truncated anyway.
+         */
+        if (!igrab(inode))
+                return 0;
+
         pagevec_init(&pvec, 0);
         if (wbc->range_cyclic) {
                 index = mapping->writeback_index; /* Start from prev offset */
@@ -3427,6 +3441,7 @@ retry:
                 index = 0;
                 goto retry;
         }
+        btrfs_add_delayed_iput(inode);
         return ret;
 }