diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c index feb36d7551ae63ccf546bb7ca4083adc9733b761..c0f375087efc3256cf5196ff08cdd2068ce18834 100644 --- a/fs/xfs/xfs_extfree_item.c +++ b/fs/xfs/xfs_extfree_item.c @@ -50,9 +50,8 @@ xfs_efi_item_free( * Freeing the efi requires that we remove it from the AIL if it has already * been placed there. However, the EFI may not yet have been placed in the AIL * when called by xfs_efi_release() from EFD processing due to the ordering of - * committed vs unpin operations in bulk insert operations. Hence the - * test_and_clear_bit(XFS_EFI_COMMITTED) to ensure only the last caller frees - * the EFI. + * committed vs unpin operations in bulk insert operations. Hence the reference + * count to ensure only the last caller frees the EFI. */ STATIC void __xfs_efi_release( @@ -60,7 +59,7 @@ __xfs_efi_release( { struct xfs_ail *ailp = efip->efi_item.li_ailp; - if (!test_and_clear_bit(XFS_EFI_COMMITTED, &efip->efi_flags)) { + if (atomic_dec_and_test(&efip->efi_refcount)) { spin_lock(&ailp->xa_lock); /* xfs_trans_ail_delete() drops the AIL lock. */ xfs_trans_ail_delete(ailp, &efip->efi_item, @@ -126,8 +125,8 @@ xfs_efi_item_pin( * 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. Otherwise coordinate with xfs_efi_release() (via - * XFS_EFI_COMMITTED) to determine who gets to free the EFI. + * transaction and free it. Otherwise coordinate with xfs_efi_release() + * to determine who gets to free the EFI. */ STATIC void xfs_efi_item_unpin( @@ -171,19 +170,13 @@ xfs_efi_item_unlock( /* * The EFI is logged only once and cannot be moved in the log, so simply return - * the lsn at which it's been logged. For bulk transaction committed - * processing, the EFI may be processed but not yet unpinned prior to the EFD - * being processed. Set the XFS_EFI_COMMITTED flag so this case can be detected - * when processing the EFD. + * the lsn at which it's been logged. */ STATIC xfs_lsn_t xfs_efi_item_committed( struct xfs_log_item *lip, xfs_lsn_t lsn) { - struct xfs_efi_log_item *efip = EFI_ITEM(lip); - - set_bit(XFS_EFI_COMMITTED, &efip->efi_flags); return lsn; } @@ -241,6 +234,7 @@ xfs_efi_init( efip->efi_format.efi_nextents = nextents; efip->efi_format.efi_id = (__psint_t)(void*)efip; atomic_set(&efip->efi_next_extent, 0); + atomic_set(&efip->efi_refcount, 2); return efip; } @@ -310,8 +304,13 @@ xfs_efi_release(xfs_efi_log_item_t *efip, uint nextents) { ASSERT(atomic_read(&efip->efi_next_extent) >= nextents); - if (atomic_sub_and_test(nextents, &efip->efi_next_extent)) + if (atomic_sub_and_test(nextents, &efip->efi_next_extent)) { __xfs_efi_release(efip); + + /* recovery needs us to drop the EFI reference, too */ + if (test_bit(XFS_EFI_RECOVERED, &efip->efi_flags)) + __xfs_efi_release(efip); + } } static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip) diff --git a/fs/xfs/xfs_extfree_item.h b/fs/xfs/xfs_extfree_item.h index 375f68e42531a614138fa7a204e73c0e61baa14a..432222418c566f6d7f30bed9951289ea9c5f1d10 100644 --- a/fs/xfs/xfs_extfree_item.h +++ b/fs/xfs/xfs_extfree_item.h @@ -114,16 +114,20 @@ typedef struct xfs_efd_log_format_64 { * Define EFI flag bits. Manipulated by set/clear/test_bit operators. */ #define XFS_EFI_RECOVERED 1 -#define XFS_EFI_COMMITTED 2 /* - * This is the "extent free intention" log item. It is used - * to log the fact that some extents need to be free. It is - * used in conjunction with the "extent free done" log item - * described below. + * This is the "extent free intention" log item. It is used to log the fact + * that some extents need to be free. It is used in conjunction with the + * "extent free done" log item described below. + * + * The EFI is reference counted so that it is not freed prior to both the EFI + * and EFD being committed and unpinned. This ensures that when the last + * reference goes away the EFI will always be in the AIL as it has been + * unpinned, regardless of whether the EFD is processed before or after the EFI. */ typedef struct xfs_efi_log_item { xfs_log_item_t efi_item; + atomic_t efi_refcount; atomic_t efi_next_extent; unsigned long efi_flags; /* misc flags */ xfs_efi_log_format_t efi_format; diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index d1dba7ce75aefeb2af92ded16d8d944f452a7a1e..3ca3380c3afe4c57d50b09a8e8956b308c191f18 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -2948,6 +2948,7 @@ xlog_recover_process_efi( * This will pull the EFI from the AIL and * free the memory associated with it. */ + set_bit(XFS_EFI_RECOVERED, &efip->efi_flags); xfs_efi_release(efip, efip->efi_format.efi_nextents); return XFS_ERROR(EIO); }