From ddf92053e45c0e07dcb031b56512d52f98cde517 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 28 Jun 2019 19:27:32 -0700 Subject: [PATCH] xfs: split iop_unlock The iop_unlock method is called when comitting or cancelling a transaction. In the latter case, the transaction may or may not be aborted. While there is no known problem with the current code in practice, this implementation is limited in that any log item implementation that might want to differentiate between a commit and a cancellation must rely on the aborted state. The aborted bit is only set when the cancelled transaction is dirty, however. This means that there is no way to distinguish between a commit and a clean transaction cancellation. For example, intent log items currently rely on this distinction. The log item is either transferred to the CIL on commit or released on transaction cancel. There is currently no possibility for a clean intent log item in a transaction, but if that state is ever introduced a cancel of such a transaction will immediately result in memory leaks of the associated log item(s). This is an interface deficiency and landmine. To clean this up, replace the iop_unlock method with an iop_release method that is specific to transaction cancel. The existing iop_committing method occurs at the same time as iop_unlock in the commit path and there is no need for two separate callbacks here. Overload the iop_committing method with the current commit time iop_unlock implementations to eliminate the need for the latter and further simplify the interface. Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_bmap_item.c | 17 +++++++---------- fs/xfs/xfs_buf_item.c | 15 ++++++++++++--- fs/xfs/xfs_dquot_item.c | 19 +++++++++++-------- fs/xfs/xfs_extfree_item.c | 17 +++++++---------- fs/xfs/xfs_icreate_item.c | 10 +++------- fs/xfs/xfs_inode_item.c | 11 ++++++----- fs/xfs/xfs_log_cil.c | 2 -- fs/xfs/xfs_refcount_item.c | 17 +++++++---------- fs/xfs/xfs_rmap_item.c | 17 +++++++---------- fs/xfs/xfs_trace.h | 2 +- fs/xfs/xfs_trans.c | 7 +++---- fs/xfs/xfs_trans.h | 4 ++-- fs/xfs/xfs_trans_buf.c | 2 +- 13 files changed, 67 insertions(+), 73 deletions(-) diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c index b2395cb1674cdd..bb5fff120ef529 100644 --- a/fs/xfs/xfs_bmap_item.c +++ b/fs/xfs/xfs_bmap_item.c @@ -120,11 +120,10 @@ xfs_bui_item_unpin( * constructed and thus we free the BUI here directly. */ STATIC void -xfs_bui_item_unlock( +xfs_bui_item_release( struct xfs_log_item *lip) { - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) - xfs_bui_release(BUI_ITEM(lip)); + xfs_bui_release(BUI_ITEM(lip)); } /* @@ -134,7 +133,7 @@ static const struct xfs_item_ops xfs_bui_item_ops = { .iop_size = xfs_bui_item_size, .iop_format = xfs_bui_item_format, .iop_unpin = xfs_bui_item_unpin, - .iop_unlock = xfs_bui_item_unlock, + .iop_release = xfs_bui_item_release, }; /* @@ -201,15 +200,13 @@ xfs_bud_item_format( * BUD. */ STATIC void -xfs_bud_item_unlock( +xfs_bud_item_release( struct xfs_log_item *lip) { struct xfs_bud_log_item *budp = BUD_ITEM(lip); - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) { - xfs_bui_release(budp->bud_buip); - kmem_zone_free(xfs_bud_zone, budp); - } + xfs_bui_release(budp->bud_buip); + kmem_zone_free(xfs_bud_zone, budp); } /* @@ -243,7 +240,7 @@ xfs_bud_item_committed( static const struct xfs_item_ops xfs_bud_item_ops = { .iop_size = xfs_bud_item_size, .iop_format = xfs_bud_item_format, - .iop_unlock = xfs_bud_item_unlock, + .iop_release = xfs_bud_item_release, .iop_committed = xfs_bud_item_committed, }; diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c index b6c684ea56c151..e9da8274bf31bc 100644 --- a/fs/xfs/xfs_buf_item.c +++ b/fs/xfs/xfs_buf_item.c @@ -595,7 +595,7 @@ xfs_buf_item_put( * free the item. */ STATIC void -xfs_buf_item_unlock( +xfs_buf_item_release( struct xfs_log_item *lip) { struct xfs_buf_log_item *bip = BUF_ITEM(lip); @@ -610,7 +610,7 @@ xfs_buf_item_unlock( &lip->li_flags); #endif - trace_xfs_buf_item_unlock(bip); + trace_xfs_buf_item_release(bip); /* * The bli dirty state should match whether the blf has logged segments @@ -640,6 +640,14 @@ xfs_buf_item_unlock( xfs_buf_relse(bp); } +STATIC void +xfs_buf_item_committing( + struct xfs_log_item *lip, + xfs_lsn_t commit_lsn) +{ + return xfs_buf_item_release(lip); +} + /* * This is called to find out where the oldest active copy of the * buf log item in the on disk log resides now that the last log @@ -680,7 +688,8 @@ static const struct xfs_item_ops xfs_buf_item_ops = { .iop_format = xfs_buf_item_format, .iop_pin = xfs_buf_item_pin, .iop_unpin = xfs_buf_item_unpin, - .iop_unlock = xfs_buf_item_unlock, + .iop_release = xfs_buf_item_release, + .iop_committing = xfs_buf_item_committing, .iop_committed = xfs_buf_item_committed, .iop_push = xfs_buf_item_push, }; diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c index 98b0d732ef534a..334f6ca1cefccd 100644 --- a/fs/xfs/xfs_dquot_item.c +++ b/fs/xfs/xfs_dquot_item.c @@ -198,14 +198,8 @@ xfs_qm_dquot_logitem_push( return rval; } -/* - * Unlock the dquot associated with the log item. - * Clear the fields of the dquot and dquot log item that - * are specific to the current transaction. If the - * hold flags is set, do not unlock the dquot. - */ STATIC void -xfs_qm_dquot_logitem_unlock( +xfs_qm_dquot_logitem_release( struct xfs_log_item *lip) { struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot; @@ -221,6 +215,14 @@ xfs_qm_dquot_logitem_unlock( xfs_dqunlock(dqp); } +STATIC void +xfs_qm_dquot_logitem_committing( + struct xfs_log_item *lip, + xfs_lsn_t commit_lsn) +{ + return xfs_qm_dquot_logitem_release(lip); +} + /* * This is the ops vector for dquots */ @@ -229,7 +231,8 @@ static const struct xfs_item_ops xfs_dquot_item_ops = { .iop_format = xfs_qm_dquot_logitem_format, .iop_pin = xfs_qm_dquot_logitem_pin, .iop_unpin = xfs_qm_dquot_logitem_unpin, - .iop_unlock = xfs_qm_dquot_logitem_unlock, + .iop_release = xfs_qm_dquot_logitem_release, + .iop_committing = xfs_qm_dquot_logitem_committing, .iop_push = xfs_qm_dquot_logitem_push, .iop_error = xfs_dquot_item_error }; diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c index c1ab3a056bb85e..70df190079950d 100644 --- a/fs/xfs/xfs_extfree_item.c +++ b/fs/xfs/xfs_extfree_item.c @@ -130,11 +130,10 @@ xfs_efi_item_unpin( * constructed and thus we free the EFI here directly. */ STATIC void -xfs_efi_item_unlock( +xfs_efi_item_release( struct xfs_log_item *lip) { - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) - xfs_efi_release(EFI_ITEM(lip)); + xfs_efi_release(EFI_ITEM(lip)); } /* @@ -144,7 +143,7 @@ static const struct xfs_item_ops xfs_efi_item_ops = { .iop_size = xfs_efi_item_size, .iop_format = xfs_efi_item_format, .iop_unpin = xfs_efi_item_unpin, - .iop_unlock = xfs_efi_item_unlock, + .iop_release = xfs_efi_item_release, }; @@ -300,15 +299,13 @@ xfs_efd_item_format( * the transaction is cancelled, drop our reference to the EFI and free the EFD. */ STATIC void -xfs_efd_item_unlock( +xfs_efd_item_release( struct xfs_log_item *lip) { struct xfs_efd_log_item *efdp = EFD_ITEM(lip); - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) { - xfs_efi_release(efdp->efd_efip); - xfs_efd_item_free(efdp); - } + xfs_efi_release(efdp->efd_efip); + xfs_efd_item_free(efdp); } /* @@ -342,7 +339,7 @@ xfs_efd_item_committed( static const struct xfs_item_ops xfs_efd_item_ops = { .iop_size = xfs_efd_item_size, .iop_format = xfs_efd_item_format, - .iop_unlock = xfs_efd_item_unlock, + .iop_release = xfs_efd_item_release, .iop_committed = xfs_efd_item_committed, }; diff --git a/fs/xfs/xfs_icreate_item.c b/fs/xfs/xfs_icreate_item.c index cbaabc55f0c934..9aceb35dce2468 100644 --- a/fs/xfs/xfs_icreate_item.c +++ b/fs/xfs/xfs_icreate_item.c @@ -57,14 +57,10 @@ xfs_icreate_item_format( } STATIC void -xfs_icreate_item_unlock( +xfs_icreate_item_release( struct xfs_log_item *lip) { - struct xfs_icreate_item *icp = ICR_ITEM(lip); - - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) - kmem_zone_free(xfs_icreate_zone, icp); - return; + kmem_zone_free(xfs_icreate_zone, ICR_ITEM(lip)); } /* @@ -89,7 +85,7 @@ xfs_icreate_item_committed( static const struct xfs_item_ops xfs_icreate_item_ops = { .iop_size = xfs_icreate_item_size, .iop_format = xfs_icreate_item_format, - .iop_unlock = xfs_icreate_item_unlock, + .iop_release = xfs_icreate_item_release, .iop_committed = xfs_icreate_item_committed, }; diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index 957f3dca0d7a5d..e152b3bb32725c 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -566,7 +566,7 @@ xfs_inode_item_push( * Unlock the inode associated with the inode log item. */ STATIC void -xfs_inode_item_unlock( +xfs_inode_item_release( struct xfs_log_item *lip) { struct xfs_inode_log_item *iip = INODE_ITEM(lip); @@ -622,9 +622,10 @@ xfs_inode_item_committed( STATIC void xfs_inode_item_committing( struct xfs_log_item *lip, - xfs_lsn_t lsn) + xfs_lsn_t commit_lsn) { - INODE_ITEM(lip)->ili_last_lsn = lsn; + INODE_ITEM(lip)->ili_last_lsn = commit_lsn; + return xfs_inode_item_release(lip); } /* @@ -635,10 +636,10 @@ static const struct xfs_item_ops xfs_inode_item_ops = { .iop_format = xfs_inode_item_format, .iop_pin = xfs_inode_item_pin, .iop_unpin = xfs_inode_item_unpin, - .iop_unlock = xfs_inode_item_unlock, + .iop_release = xfs_inode_item_release, .iop_committed = xfs_inode_item_committed, .iop_push = xfs_inode_item_push, - .iop_committing = xfs_inode_item_committing, + .iop_committing = xfs_inode_item_committing, .iop_error = xfs_inode_item_error }; diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c index c856bfce5bf207..4cb459f21ad41f 100644 --- a/fs/xfs/xfs_log_cil.c +++ b/fs/xfs/xfs_log_cil.c @@ -1024,8 +1024,6 @@ xfs_log_commit_cil( xfs_trans_del_item(lip); if (lip->li_ops->iop_committing) lip->li_ops->iop_committing(lip, xc_commit_lsn); - if (lip->li_ops->iop_unlock) - lip->li_ops->iop_unlock(lip); } xlog_cil_push_background(log); diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c index 03a61886fe2aba..9f8fb23dcc8105 100644 --- a/fs/xfs/xfs_refcount_item.c +++ b/fs/xfs/xfs_refcount_item.c @@ -118,11 +118,10 @@ xfs_cui_item_unpin( * constructed and thus we free the CUI here directly. */ STATIC void -xfs_cui_item_unlock( +xfs_cui_item_release( struct xfs_log_item *lip) { - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) - xfs_cui_release(CUI_ITEM(lip)); + xfs_cui_release(CUI_ITEM(lip)); } /* @@ -132,7 +131,7 @@ static const struct xfs_item_ops xfs_cui_item_ops = { .iop_size = xfs_cui_item_size, .iop_format = xfs_cui_item_format, .iop_unpin = xfs_cui_item_unpin, - .iop_unlock = xfs_cui_item_unlock, + .iop_release = xfs_cui_item_release, }; /* @@ -205,15 +204,13 @@ xfs_cud_item_format( * CUD. */ STATIC void -xfs_cud_item_unlock( +xfs_cud_item_release( struct xfs_log_item *lip) { struct xfs_cud_log_item *cudp = CUD_ITEM(lip); - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) { - xfs_cui_release(cudp->cud_cuip); - kmem_zone_free(xfs_cud_zone, cudp); - } + xfs_cui_release(cudp->cud_cuip); + kmem_zone_free(xfs_cud_zone, cudp); } /* @@ -247,7 +244,7 @@ xfs_cud_item_committed( static const struct xfs_item_ops xfs_cud_item_ops = { .iop_size = xfs_cud_item_size, .iop_format = xfs_cud_item_format, - .iop_unlock = xfs_cud_item_unlock, + .iop_release = xfs_cud_item_release, .iop_committed = xfs_cud_item_committed, }; diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c index df9f2505c5f330..e907bd169de573 100644 --- a/fs/xfs/xfs_rmap_item.c +++ b/fs/xfs/xfs_rmap_item.c @@ -117,11 +117,10 @@ xfs_rui_item_unpin( * constructed and thus we free the RUI here directly. */ STATIC void -xfs_rui_item_unlock( +xfs_rui_item_release( struct xfs_log_item *lip) { - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) - xfs_rui_release(RUI_ITEM(lip)); + xfs_rui_release(RUI_ITEM(lip)); } /* @@ -131,7 +130,7 @@ static const struct xfs_item_ops xfs_rui_item_ops = { .iop_size = xfs_rui_item_size, .iop_format = xfs_rui_item_format, .iop_unpin = xfs_rui_item_unpin, - .iop_unlock = xfs_rui_item_unlock, + .iop_release = xfs_rui_item_release, }; /* @@ -226,15 +225,13 @@ xfs_rud_item_format( * RUD. */ STATIC void -xfs_rud_item_unlock( +xfs_rud_item_release( struct xfs_log_item *lip) { struct xfs_rud_log_item *rudp = RUD_ITEM(lip); - if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) { - xfs_rui_release(rudp->rud_ruip); - kmem_zone_free(xfs_rud_zone, rudp); - } + xfs_rui_release(rudp->rud_ruip); + kmem_zone_free(xfs_rud_zone, rudp); } /* @@ -268,7 +265,7 @@ xfs_rud_item_committed( static const struct xfs_item_ops xfs_rud_item_ops = { .iop_size = xfs_rud_item_size, .iop_format = xfs_rud_item_format, - .iop_unlock = xfs_rud_item_unlock, + .iop_release = xfs_rud_item_release, .iop_committed = xfs_rud_item_committed, }; diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 195a9cdb954e31..65c920554b96a0 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -475,7 +475,7 @@ DEFINE_BUF_ITEM_EVENT(xfs_buf_item_ordered); DEFINE_BUF_ITEM_EVENT(xfs_buf_item_pin); DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unpin); DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unpin_stale); -DEFINE_BUF_ITEM_EVENT(xfs_buf_item_unlock); +DEFINE_BUF_ITEM_EVENT(xfs_buf_item_release); DEFINE_BUF_ITEM_EVENT(xfs_buf_item_committed); DEFINE_BUF_ITEM_EVENT(xfs_buf_item_push); DEFINE_BUF_ITEM_EVENT(xfs_trans_get_buf); diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index 003d916904d296..261c51486d7abb 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -780,9 +780,8 @@ xfs_trans_free_items( xfs_trans_del_item(lip); if (abort) set_bit(XFS_LI_ABORTED, &lip->li_flags); - - if (lip->li_ops->iop_unlock) - lip->li_ops->iop_unlock(lip); + if (lip->li_ops->iop_release) + lip->li_ops->iop_release(lip); } } @@ -815,7 +814,7 @@ xfs_log_item_batch_insert( * * If we are called with the aborted flag set, it is because a log write during * a CIL checkpoint commit has failed. In this case, all the items in the - * checkpoint have already gone through iop_committed and iop_unlock, which + * checkpoint have already gone through iop_committed and iop_committing, which * means that checkpoint commit abort handling is treated exactly the same * as an iclog write error even though we haven't started any IO yet. Hence in * this case all we need to do is iop_committed processing, followed by an diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index fd35da161a2b16..522c1d565aa412 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -72,9 +72,9 @@ struct xfs_item_ops { void (*iop_pin)(xfs_log_item_t *); void (*iop_unpin)(xfs_log_item_t *, int remove); uint (*iop_push)(struct xfs_log_item *, struct list_head *); - void (*iop_unlock)(xfs_log_item_t *); + void (*iop_committing)(struct xfs_log_item *, xfs_lsn_t commit_lsn); + void (*iop_release)(struct xfs_log_item *); xfs_lsn_t (*iop_committed)(xfs_log_item_t *, xfs_lsn_t); - void (*iop_committing)(xfs_log_item_t *, xfs_lsn_t); void (*iop_error)(xfs_log_item_t *, xfs_buf_t *); }; diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c index a1764a1dbd996f..0cdd8a314d85bc 100644 --- a/fs/xfs/xfs_trans_buf.c +++ b/fs/xfs/xfs_trans_buf.c @@ -427,7 +427,7 @@ xfs_trans_brelse( /* * Mark the buffer as not needing to be unlocked when the buf item's - * iop_unlock() routine is called. The buffer must already be locked + * iop_committing() routine is called. The buffer must already be locked * and associated with the given transaction. */ /* ARGSUSED */