ext4: Make fsync sync new parent directories in no-journal mode

Add a new ext4 state to tell us when a file has been newly created; use
that state in ext4_sync_file in no-journal mode to tell us when we need
to sync the parent directory as well as the inode and data itself.  This
fixes a problem in which a panic or power failure may lose the entire
file even when using fsync, since the parent directory entry is lost.

Addresses-Google-Bug: #2480057

Signed-off-by: Frank Mayhar <fmayhar@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 124ef77..60bd310 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1180,6 +1180,7 @@ enum {
        EXT4_STATE_DA_ALLOC_CLOSE,      /* Alloc DA blks on close */
        EXT4_STATE_EXT_MIGRATE,         /* Inode is migrating */
        EXT4_STATE_DIO_UNWRITTEN,       /* need convert on dio done*/
+       EXT4_STATE_NEWENTRY,            /* File just added to dir */
 };
 
 #define EXT4_INODE_BIT_FNS(name, field)                                        \

diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 6ca7b6e..e187f87 100644 (file)
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -34,6 +34,29 @@
 
 #include <trace/events/ext4.h>
 
+/*
+ * If we're not journaling and this is a just-created file, we have to
+ * sync our parent directory (if it was freshly created) since
+ * otherwise it will only be written by writeback, leaving a huge
+ * window during which a crash may lose the file.  This may apply for
+ * the parent directory's parent as well, and so on recursively, if
+ * they are also freshly created.
+ */
+static void ext4_sync_parent(struct inode *inode)
+{
+       struct dentry *dentry = NULL;
+
+       while (inode && ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) {
+               ext4_clear_inode_state(inode, EXT4_STATE_NEWENTRY);
+               dentry = list_entry(inode->i_dentry.next,
+                                   struct dentry, d_alias);
+               if (!dentry || !dentry->d_parent || !dentry->d_parent->d_inode)
+                       break;
+               inode = dentry->d_parent->d_inode;
+               sync_mapping_buffers(inode->i_mapping);
+       }
+}
+
 /*
  * akpm: A new design for ext4_sync_file().
  *
@@ -67,8 +90,12 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
        if (ret < 0)
                return ret;
 
-       if (!journal)
-               return simple_fsync(file, dentry, datasync);
+       if (!journal) {
+               ret = simple_fsync(file, dentry, datasync);
+               if (!ret && !list_empty(&inode->i_dentry))
+                       ext4_sync_parent(inode);
+               return ret;
+       }
 
        /*
         * data=writeback,ordered:

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 83be743..a43e661 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1517,6 +1517,8 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
        de->rec_len = ext4_rec_len_to_disk(blocksize, blocksize);
        retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
        brelse(bh);
+       if (retval == 0)
+               ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
        return retval;
 }