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xfs: fix EFI transaction cancellation.

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XFS_EFI_CANCELED has not been set in the code base since
xfs_efi_cancel() was removed back in 2006 by commit
065d312e15 ("[XFS] Remove unused
iop_abort log item operation), and even then xfs_efi_cancel() was
never called. I haven't tracked it back further than that (beyond
git history), but it indicates that the handling of EFIs in
cancelled transactions has been broken for a long time.

Basically, when we get an IOP_UNPIN(lip, 1); call from
xfs_trans_uncommit() (i.e. remove == 1), if we don't free the log
item descriptor we leak it. Fix the behviour to be correct and kill
the XFS_EFI_CANCELED flag.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-12-20 11:57:24 +11:00 committed by Dave Chinner
parent 821eb21d97
commit 9c5f8414ef
2 changed files with 9 additions and 12 deletions
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20
fs/xfs/xfs_extfree_item.c
View File

@ -99,10 +99,11 @@ xfs_efi_item_pin(
}
/*
* While EFIs cannot really be pinned, the unpin operation is the
* last place at which the EFI is manipulated during a transaction.
* Here we coordinate with xfs_efi_cancel() to determine who gets to
* free the EFI.
* While EFIs cannot really be pinned, the unpin operation is the last place at
* which the EFI is manipulated during a transaction. If we are being asked to
* remove the EFI it's because the transaction has been cancelled and by
* definition that means the EFI cannot be in the AIL so remove it from the
* transaction and free it.
*/
STATIC void
xfs_efi_item_unpin(
@ -113,17 +114,14 @@ xfs_efi_item_unpin(
struct xfs_ail *ailp = lip->li_ailp;
spin_lock(&ailp->xa_lock);
if (efip->efi_flags & XFS_EFI_CANCELED) {
if (remove)
xfs_trans_del_item(lip);
/* xfs_trans_ail_delete() drops the AIL lock. */
xfs_trans_ail_delete(ailp, lip);
if (remove) {
ASSERT(!(lip->li_flags & XFS_LI_IN_AIL));
xfs_trans_del_item(lip);
xfs_efi_item_free(efip);
} else {
efip->efi_flags |= XFS_EFI_COMMITTED;
spin_unlock(&ailp->xa_lock);
}
spin_unlock(&ailp->xa_lock);
}
/*

1
fs/xfs/xfs_extfree_item.h
View File

@ -115,7 +115,6 @@ typedef struct xfs_efd_log_format_64 {
*/
#define XFS_EFI_RECOVERED 0x1
#define XFS_EFI_COMMITTED 0x2
#define XFS_EFI_CANCELED 0x4
/*
* This is the "extent free intention" log item. It is used