1 files changed, 16 insertions, 1 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e204d8aabe7d..0dd9150c0c04 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2495,6 +2495,20 @@ static int ext4_nonda_switch(struct super_block *sb)
         return 0;
 }
 
+/* We always reserve for an inode update; the superblock could be there too */
+static int ext4_da_write_credits(struct inode *inode, loff_t pos, unsigned len)
+{
+        if (likely(EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
+                                EXT4_FEATURE_RO_COMPAT_LARGE_FILE)))
+                return 1;
+
+        if (pos + len <= 0x7fffffffULL)
+                return 1;
+
+        /* We might need to update the superblock to set LARGE_FILE */
+        return 2;
+}
+
 static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
                                loff_t pos, unsigned len, unsigned flags,
                                struct page **pagep, void **fsdata)
@@ -2545,7 +2559,8 @@ retry_grab:
          * of file which has an already mapped buffer.
          */
 retry_journal:
-        handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, 1);
+        handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE,
+                                ext4_da_write_credits(inode, pos, len));
         if (IS_ERR(handle)) {
                 page_cache_release(page);
                 return PTR_ERR(handle);