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authorTheodore Ts'o <tytso@mit.edu>2008-08-02 21:10:38 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-08-02 21:10:38 -0400
commitbc965ab3f2b4b7bb898b11d61d25295c2053b8ac (patch)
tree7f8cbd4e5d9c2a4e63fb35d5444f77bfb667c00f /fs
parent0123c93998511978556b03d2bb023af92aa24d55 (diff)
downloadop-kernel-dev-bc965ab3f2b4b7bb898b11d61d25295c2053b8ac.zip
op-kernel-dev-bc965ab3f2b4b7bb898b11d61d25295c2053b8ac.tar.gz
ext4: Fix lack of credits BUG() when deleting a badly fragmented inode
The extents codepath for ext4_truncate() requests journal transaction credits in very small chunks, requesting only what is needed. This means there may not be enough credits left on the transaction handle after ext4_truncate() returns and then when ext4_delete_inode() tries finish up its work, it may not have enough transaction credits, causing a BUG() oops in the jbd2 core. Also, reserve an extra 2 blocks when starting an ext4_delete_inode() since we need to update the inode bitmap, as well as update the orphaned inode linked list. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/inode.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 37f834b..2697eaf 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -191,6 +191,7 @@ static int ext4_journal_test_restart(handle_t *handle, struct inode *inode)
void ext4_delete_inode (struct inode * inode)
{
handle_t *handle;
+ int err;
if (ext4_should_order_data(inode))
ext4_begin_ordered_truncate(inode, 0);
@@ -199,8 +200,9 @@ void ext4_delete_inode (struct inode * inode)
if (is_bad_inode(inode))
goto no_delete;
- handle = start_transaction(inode);
+ handle = ext4_journal_start(inode, blocks_for_truncate(inode)+3);
if (IS_ERR(handle)) {
+ ext4_std_error(inode->i_sb, PTR_ERR(handle));
/*
* If we're going to skip the normal cleanup, we still need to
* make sure that the in-core orphan linked list is properly
@@ -213,8 +215,34 @@ void ext4_delete_inode (struct inode * inode)
if (IS_SYNC(inode))
handle->h_sync = 1;
inode->i_size = 0;
+ err = ext4_mark_inode_dirty(handle, inode);
+ if (err) {
+ ext4_warning(inode->i_sb, __func__,
+ "couldn't mark inode dirty (err %d)", err);
+ goto stop_handle;
+ }
if (inode->i_blocks)
ext4_truncate(inode);
+
+ /*
+ * ext4_ext_truncate() doesn't reserve any slop when it
+ * restarts journal transactions; therefore there may not be
+ * enough credits left in the handle to remove the inode from
+ * the orphan list and set the dtime field.
+ */
+ if (handle->h_buffer_credits < 3) {
+ err = ext4_journal_extend(handle, 3);
+ if (err > 0)
+ err = ext4_journal_restart(handle, 3);
+ if (err != 0) {
+ ext4_warning(inode->i_sb, __func__,
+ "couldn't extend journal (err %d)", err);
+ stop_handle:
+ ext4_journal_stop(handle);
+ goto no_delete;
+ }
+ }
+
/*
* Kill off the orphan record which ext4_truncate created.
* AKPM: I think this can be inside the above `if'.
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