diff options
Diffstat (limited to 'fs/xfs/xfs_trans.c')
-rw-r--r-- | fs/xfs/xfs_trans.c | 475 |
1 files changed, 4 insertions, 471 deletions
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index 1f35b2f..329b06a 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -1158,7 +1158,6 @@ xfs_trans_add_item( lidp->lid_item = lip; lidp->lid_flags = 0; - lidp->lid_size = 0; list_add_tail(&lidp->lid_trans, &tp->t_items); lip->li_desc = lidp; @@ -1210,219 +1209,6 @@ xfs_trans_free_items( } } -/* - * Unlock the items associated with a transaction. - * - * Items which were not logged should be freed. Those which were logged must - * still be tracked so they can be unpinned when the transaction commits. - */ -STATIC void -xfs_trans_unlock_items( - struct xfs_trans *tp, - xfs_lsn_t commit_lsn) -{ - struct xfs_log_item_desc *lidp, *next; - - list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) { - struct xfs_log_item *lip = lidp->lid_item; - - lip->li_desc = NULL; - - if (commit_lsn != NULLCOMMITLSN) - IOP_COMMITTING(lip, commit_lsn); - IOP_UNLOCK(lip); - - /* - * Free the descriptor if the item is not dirty - * within this transaction. - */ - if (!(lidp->lid_flags & XFS_LID_DIRTY)) - xfs_trans_free_item_desc(lidp); - } -} - -/* - * Total up the number of log iovecs needed to commit this - * transaction. The transaction itself needs one for the - * transaction header. Ask each dirty item in turn how many - * it needs to get the total. - */ -static uint -xfs_trans_count_vecs( - struct xfs_trans *tp) -{ - int nvecs; - struct xfs_log_item_desc *lidp; - - nvecs = 1; - - /* In the non-debug case we need to start bailing out if we - * didn't find a log_item here, return zero and let trans_commit - * deal with it. - */ - if (list_empty(&tp->t_items)) { - ASSERT(0); - return 0; - } - - list_for_each_entry(lidp, &tp->t_items, lid_trans) { - /* - * Skip items which aren't dirty in this transaction. - */ - if (!(lidp->lid_flags & XFS_LID_DIRTY)) - continue; - lidp->lid_size = IOP_SIZE(lidp->lid_item); - nvecs += lidp->lid_size; - } - - return nvecs; -} - -/* - * Fill in the vector with pointers to data to be logged - * by this transaction. The transaction header takes - * the first vector, and then each dirty item takes the - * number of vectors it indicated it needed in xfs_trans_count_vecs(). - * - * As each item fills in the entries it needs, also pin the item - * so that it cannot be flushed out until the log write completes. - */ -static void -xfs_trans_fill_vecs( - struct xfs_trans *tp, - struct xfs_log_iovec *log_vector) -{ - struct xfs_log_item_desc *lidp; - struct xfs_log_iovec *vecp; - uint nitems; - - /* - * Skip over the entry for the transaction header, we'll - * fill that in at the end. - */ - vecp = log_vector + 1; - - nitems = 0; - ASSERT(!list_empty(&tp->t_items)); - list_for_each_entry(lidp, &tp->t_items, lid_trans) { - /* Skip items which aren't dirty in this transaction. */ - if (!(lidp->lid_flags & XFS_LID_DIRTY)) - continue; - - /* - * The item may be marked dirty but not log anything. This can - * be used to get called when a transaction is committed. - */ - if (lidp->lid_size) - nitems++; - IOP_FORMAT(lidp->lid_item, vecp); - vecp += lidp->lid_size; - IOP_PIN(lidp->lid_item); - } - - /* - * Now that we've counted the number of items in this transaction, fill - * in the transaction header. Note that the transaction header does not - * have a log item. - */ - tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC; - tp->t_header.th_type = tp->t_type; - tp->t_header.th_num_items = nitems; - log_vector->i_addr = (xfs_caddr_t)&tp->t_header; - log_vector->i_len = sizeof(xfs_trans_header_t); - log_vector->i_type = XLOG_REG_TYPE_TRANSHDR; -} - -/* - * The committed item processing consists of calling the committed routine of - * each logged item, updating the item's position in the AIL if necessary, and - * unpinning each item. If the committed routine returns -1, then do nothing - * further with the item because it may have been freed. - * - * Since items are unlocked when they are copied to the incore log, it is - * possible for two transactions to be completing and manipulating the same - * item simultaneously. The AIL lock will protect the lsn field of each item. - * The value of this field can never go backwards. - * - * We unpin the items after repositioning them in the AIL, because otherwise - * they could be immediately flushed and we'd have to race with the flusher - * trying to pull the item from the AIL as we add it. - */ -static void -xfs_trans_item_committed( - struct xfs_log_item *lip, - xfs_lsn_t commit_lsn, - int aborted) -{ - xfs_lsn_t item_lsn; - struct xfs_ail *ailp; - - if (aborted) - lip->li_flags |= XFS_LI_ABORTED; - item_lsn = IOP_COMMITTED(lip, commit_lsn); - - /* item_lsn of -1 means the item needs no further processing */ - if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) - return; - - /* - * If the returned lsn is greater than what it contained before, update - * the location of the item in the AIL. If it is not, then do nothing. - * Items can never move backwards in the AIL. - * - * While the new lsn should usually be greater, it is possible that a - * later transaction completing simultaneously with an earlier one - * using the same item could complete first with a higher lsn. This - * would cause the earlier transaction to fail the test below. - */ - ailp = lip->li_ailp; - spin_lock(&ailp->xa_lock); - if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) { - /* - * This will set the item's lsn to item_lsn and update the - * position of the item in the AIL. - * - * xfs_trans_ail_update() drops the AIL lock. - */ - xfs_trans_ail_update(ailp, lip, item_lsn); - } else { - spin_unlock(&ailp->xa_lock); - } - - /* - * Now that we've repositioned the item in the AIL, unpin it so it can - * be flushed. Pass information about buffer stale state down from the - * log item flags, if anyone else stales the buffer we do not want to - * pay any attention to it. - */ - IOP_UNPIN(lip, 0); -} - -/* - * This is typically called by the LM when a transaction has been fully - * committed to disk. It needs to unpin the items which have - * been logged by the transaction and update their positions - * in the AIL if necessary. - * - * This also gets called when the transactions didn't get written out - * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then. - */ -STATIC void -xfs_trans_committed( - void *arg, - int abortflag) -{ - struct xfs_trans *tp = arg; - struct xfs_log_item_desc *lidp, *next; - - list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) { - xfs_trans_item_committed(lidp->lid_item, tp->t_lsn, abortflag); - xfs_trans_free_item_desc(lidp); - } - - xfs_trans_free(tp); -} - static inline void xfs_log_item_batch_insert( struct xfs_ail *ailp, @@ -1538,258 +1324,6 @@ xfs_trans_committed_bulk( } /* - * Called from the trans_commit code when we notice that the filesystem is in - * the middle of a forced shutdown. - * - * When we are called here, we have already pinned all the items in the - * transaction. However, neither IOP_COMMITTING or IOP_UNLOCK has been called - * so we can simply walk the items in the transaction, unpin them with an abort - * flag and then free the items. Note that unpinning the items can result in - * them being freed immediately, so we need to use a safe list traversal method - * here. - */ -STATIC void -xfs_trans_uncommit( - struct xfs_trans *tp, - uint flags) -{ - struct xfs_log_item_desc *lidp, *n; - - list_for_each_entry_safe(lidp, n, &tp->t_items, lid_trans) { - if (lidp->lid_flags & XFS_LID_DIRTY) - IOP_UNPIN(lidp->lid_item, 1); - } - - xfs_trans_unreserve_and_mod_sb(tp); - xfs_trans_unreserve_and_mod_dquots(tp); - - xfs_trans_free_items(tp, NULLCOMMITLSN, flags); - xfs_trans_free(tp); -} - -/* - * Format the transaction direct to the iclog. This isolates the physical - * transaction commit operation from the logical operation and hence allows - * other methods to be introduced without affecting the existing commit path. - */ -static int -xfs_trans_commit_iclog( - struct xfs_mount *mp, - struct xfs_trans *tp, - xfs_lsn_t *commit_lsn, - int flags) -{ - int shutdown; - int error; - int log_flags = 0; - struct xlog_in_core *commit_iclog; -#define XFS_TRANS_LOGVEC_COUNT 16 - struct xfs_log_iovec log_vector_fast[XFS_TRANS_LOGVEC_COUNT]; - struct xfs_log_iovec *log_vector; - uint nvec; - - - /* - * Ask each log item how many log_vector entries it will - * need so we can figure out how many to allocate. - * Try to avoid the kmem_alloc() call in the common case - * by using a vector from the stack when it fits. - */ - nvec = xfs_trans_count_vecs(tp); - if (nvec == 0) { - return ENOMEM; /* triggers a shutdown! */ - } else if (nvec <= XFS_TRANS_LOGVEC_COUNT) { - log_vector = log_vector_fast; - } else { - log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec * - sizeof(xfs_log_iovec_t), - KM_SLEEP); - } - - /* - * Fill in the log_vector and pin the logged items, and - * then write the transaction to the log. - */ - xfs_trans_fill_vecs(tp, log_vector); - - if (flags & XFS_TRANS_RELEASE_LOG_RES) - log_flags = XFS_LOG_REL_PERM_RESERV; - - error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn)); - - /* - * The transaction is committed incore here, and can go out to disk - * at any time after this call. However, all the items associated - * with the transaction are still locked and pinned in memory. - */ - *commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags); - - tp->t_commit_lsn = *commit_lsn; - trace_xfs_trans_commit_lsn(tp); - - if (nvec > XFS_TRANS_LOGVEC_COUNT) - kmem_free(log_vector); - - /* - * If we got a log write error. Unpin the logitems that we - * had pinned, clean up, free trans structure, and return error. - */ - if (error || *commit_lsn == -1) { - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); - xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT); - return XFS_ERROR(EIO); - } - - /* - * Once the transaction has committed, unused - * reservations need to be released and changes to - * the superblock need to be reflected in the in-core - * version. Do that now. - */ - xfs_trans_unreserve_and_mod_sb(tp); - - /* - * Tell the LM to call the transaction completion routine - * when the log write with LSN commit_lsn completes (e.g. - * when the transaction commit really hits the on-disk log). - * After this call we cannot reference tp, because the call - * can happen at any time and the call will free the transaction - * structure pointed to by tp. The only case where we call - * the completion routine (xfs_trans_committed) directly is - * if the log is turned off on a debug kernel or we're - * running in simulation mode (the log is explicitly turned - * off). - */ - tp->t_logcb.cb_func = xfs_trans_committed; - tp->t_logcb.cb_arg = tp; - - /* - * We need to pass the iclog buffer which was used for the - * transaction commit record into this function, and attach - * the callback to it. The callback must be attached before - * the items are unlocked to avoid racing with other threads - * waiting for an item to unlock. - */ - shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb)); - - /* - * Mark this thread as no longer being in a transaction - */ - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); - - /* - * Once all the items of the transaction have been copied - * to the in core log and the callback is attached, the - * items can be unlocked. - * - * This will free descriptors pointing to items which were - * not logged since there is nothing more to do with them. - * For items which were logged, we will keep pointers to them - * so they can be unpinned after the transaction commits to disk. - * This will also stamp each modified meta-data item with - * the commit lsn of this transaction for dependency tracking - * purposes. - */ - xfs_trans_unlock_items(tp, *commit_lsn); - - /* - * If we detected a log error earlier, finish committing - * the transaction now (unpin log items, etc). - * - * Order is critical here, to avoid using the transaction - * pointer after its been freed (by xfs_trans_committed - * either here now, or as a callback). We cannot do this - * step inside xfs_log_notify as was done earlier because - * of this issue. - */ - if (shutdown) - xfs_trans_committed(tp, XFS_LI_ABORTED); - - /* - * Now that the xfs_trans_committed callback has been attached, - * and the items are released we can finally allow the iclog to - * go to disk. - */ - return xfs_log_release_iclog(mp, commit_iclog); -} - -/* - * Walk the log items and allocate log vector structures for - * each item large enough to fit all the vectors they require. - * Note that this format differs from the old log vector format in - * that there is no transaction header in these log vectors. - */ -STATIC struct xfs_log_vec * -xfs_trans_alloc_log_vecs( - xfs_trans_t *tp) -{ - struct xfs_log_item_desc *lidp; - struct xfs_log_vec *lv = NULL; - struct xfs_log_vec *ret_lv = NULL; - - - /* Bail out if we didn't find a log item. */ - if (list_empty(&tp->t_items)) { - ASSERT(0); - return NULL; - } - - list_for_each_entry(lidp, &tp->t_items, lid_trans) { - struct xfs_log_vec *new_lv; - - /* Skip items which aren't dirty in this transaction. */ - if (!(lidp->lid_flags & XFS_LID_DIRTY)) - continue; - - /* Skip items that do not have any vectors for writing */ - lidp->lid_size = IOP_SIZE(lidp->lid_item); - if (!lidp->lid_size) - continue; - - new_lv = kmem_zalloc(sizeof(*new_lv) + - lidp->lid_size * sizeof(struct xfs_log_iovec), - KM_SLEEP); - - /* The allocated iovec region lies beyond the log vector. */ - new_lv->lv_iovecp = (struct xfs_log_iovec *)&new_lv[1]; - new_lv->lv_niovecs = lidp->lid_size; - new_lv->lv_item = lidp->lid_item; - if (!ret_lv) - ret_lv = new_lv; - else - lv->lv_next = new_lv; - lv = new_lv; - } - - return ret_lv; -} - -static int -xfs_trans_commit_cil( - struct xfs_mount *mp, - struct xfs_trans *tp, - xfs_lsn_t *commit_lsn, - int flags) -{ - struct xfs_log_vec *log_vector; - - /* - * Get each log item to allocate a vector structure for - * the log item to to pass to the log write code. The - * CIL commit code will format the vector and save it away. - */ - log_vector = xfs_trans_alloc_log_vecs(tp); - if (!log_vector) - return ENOMEM; - - xfs_log_commit_cil(mp, tp, log_vector, commit_lsn, flags); - - current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); - xfs_trans_free(tp); - return 0; -} - -/* * Commit the given transaction to the log. * * XFS disk error handling mechanism is not based on a typical @@ -1845,17 +1379,16 @@ xfs_trans_commit( xfs_trans_apply_sb_deltas(tp); xfs_trans_apply_dquot_deltas(tp); - if (mp->m_flags & XFS_MOUNT_DELAYLOG) - error = xfs_trans_commit_cil(mp, tp, &commit_lsn, flags); - else - error = xfs_trans_commit_iclog(mp, tp, &commit_lsn, flags); - + error = xfs_log_commit_cil(mp, tp, &commit_lsn, flags); if (error == ENOMEM) { xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); error = XFS_ERROR(EIO); goto out_unreserve; } + current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS); + xfs_trans_free(tp); + /* * If the transaction needs to be synchronous, then force the * log out now and wait for it. |