1 files changed, 24 insertions, 4 deletions

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 953b430f92e3..acf1b1423327 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -172,10 +172,21 @@ static int try_to_extend_transaction(handle_t *handle, struct inode *inode)
  * so before we call here everything must be consistently dirtied against
  * this transaction.
  */
-static int ext3_journal_test_restart(handle_t *handle, struct inode *inode)
+static int truncate_restart_transaction(handle_t *handle, struct inode *inode)
 {
+        int ret;
+
         jbd_debug(2, "restarting handle %p\n", handle);
-        return ext3_journal_restart(handle, blocks_for_truncate(inode));
+        /*
+         * Drop truncate_mutex to avoid deadlock with ext3_get_blocks_handle
+         * At this moment, get_block can be called only for blocks inside
+         * i_size since page cache has been already dropped and writes are
+         * blocked by i_mutex. So we can safely drop the truncate_mutex.
+         */
+        mutex_unlock(&EXT3_I(inode)->truncate_mutex);
+        ret = ext3_journal_restart(handle, blocks_for_truncate(inode));
+        mutex_lock(&EXT3_I(inode)->truncate_mutex);
+        return ret;
 }
 
 /*
@@ -2075,7 +2086,7 @@ static void ext3_clear_blocks(handle_t *handle, struct inode *inode,
                         ext3_journal_dirty_metadata(handle, bh);
                 }
                 ext3_mark_inode_dirty(handle, inode);
-                ext3_journal_test_restart(handle, inode);
+                truncate_restart_transaction(handle, inode);
                 if (bh) {
                         BUFFER_TRACE(bh, "retaking write access");
                         ext3_journal_get_write_access(handle, bh);
@@ -2285,7 +2296,7 @@ static void ext3_free_branches(handle_t *handle, struct inode *inode,
                                 return;
                         if (try_to_extend_transaction(handle, inode)) {
                                 ext3_mark_inode_dirty(handle, inode);
-                                ext3_journal_test_restart(handle, inode);
+                                truncate_restart_transaction(handle, inode);
                         }
 
                         ext3_free_blocks(handle, inode, nr, 1);
@@ -2895,6 +2906,10 @@ static int ext3_do_update_inode(handle_t *handle,
         struct buffer_head *bh = iloc->bh;
         int err = 0, rc, block;
 
+again:
+        /* we can't allow multiple procs in here at once, its a bit racey */
+        lock_buffer(bh);
+
         /* For fields not not tracking in the in-memory inode,
          * initialise them to zero for new inodes. */
         if (ei->i_state & EXT3_STATE_NEW)
@@ -2954,16 +2969,20 @@ static int ext3_do_update_inode(handle_t *handle,
                                /* If this is the first large file
                                 * created, add a flag to the superblock.
                                 */
+                                unlock_buffer(bh);
                                 err = ext3_journal_get_write_access(handle,
                                                 EXT3_SB(sb)->s_sbh);
                                 if (err)
                                         goto out_brelse;
+
                                 ext3_update_dynamic_rev(sb);
                                 EXT3_SET_RO_COMPAT_FEATURE(sb,
                                         EXT3_FEATURE_RO_COMPAT_LARGE_FILE);
                                 handle->h_sync = 1;
                                 err = ext3_journal_dirty_metadata(handle,
                                                 EXT3_SB(sb)->s_sbh);
+                                /* get our lock and start over */
+                                goto again;
                         }
                 }
         }
@@ -2986,6 +3005,7 @@ static int ext3_do_update_inode(handle_t *handle,
                 raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize);
 
         BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
+        unlock_buffer(bh);
         rc = ext3_journal_dirty_metadata(handle, bh);
         if (!err)
                 err = rc;