[Patch] btrfs: use file_remove_suid() after i_mutex is held

[Amerigo Wang]

file_remove_suid() should be called with i_mutex held,
file_update_time() too. So move them after mutex_lock().

Plus, check the return value of kmalloc().

Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>

---
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 7c3cd24..cd36301 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -944,14 +944,17 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 	if (count == 0)
 		goto out_nolock;
 
+	mutex_lock(&inode->i_mutex);
+
 	err = file_remove_suid(file);
 	if (err)
-		goto out_nolock;
+		goto out;
 	file_update_time(file);
 
 	pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
+	if (!pages)
+		goto out;
 
-	mutex_lock(&inode->i_mutex);
 	BTRFS_I(inode)->sequence++;
 	first_index = pos >> PAGE_CACHE_SHIFT;
 	last_index = (pos + count) >> PAGE_CACHE_SHIFT;
--
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