Lines Matching full:transaction
3 * linux/fs/jbd2/transaction.c
9 * Generic filesystem transaction handling code; part of the ext2fs
46 pr_emerg("JBD2: failed to create transaction cache\n"); in jbd2_journal_init_transaction_cache()
58 void jbd2_journal_free_transaction(transaction_t *transaction) in jbd2_journal_free_transaction() argument
60 if (unlikely(ZERO_OR_NULL_PTR(transaction))) in jbd2_journal_free_transaction()
62 kmem_cache_free(transaction_cache, transaction); in jbd2_journal_free_transaction()
68 * Simply initialise a new transaction. Initialize it in
70 * have an existing running transaction: we only make a new transaction
75 * new transaction and we can't block without protecting against other
81 transaction_t *transaction) in jbd2_get_transaction() argument
83 transaction->t_journal = journal; in jbd2_get_transaction()
84 transaction->t_state = T_RUNNING; in jbd2_get_transaction()
85 transaction->t_start_time = ktime_get(); in jbd2_get_transaction()
86 transaction->t_tid = journal->j_transaction_sequence++; in jbd2_get_transaction()
87 transaction->t_expires = jiffies + journal->j_commit_interval; in jbd2_get_transaction()
88 atomic_set(&transaction->t_updates, 0); in jbd2_get_transaction()
89 atomic_set(&transaction->t_outstanding_credits, in jbd2_get_transaction()
92 atomic_set(&transaction->t_outstanding_revokes, 0); in jbd2_get_transaction()
93 atomic_set(&transaction->t_handle_count, 0); in jbd2_get_transaction()
94 INIT_LIST_HEAD(&transaction->t_inode_list); in jbd2_get_transaction()
96 /* Set up the commit timer for the new transaction. */ in jbd2_get_transaction()
97 journal->j_commit_timer.expires = round_jiffies_up(transaction->t_expires); in jbd2_get_transaction()
101 journal->j_running_transaction = transaction; in jbd2_get_transaction()
102 transaction->t_max_wait = 0; in jbd2_get_transaction()
103 transaction->t_start = jiffies; in jbd2_get_transaction()
104 transaction->t_requested = 0; in jbd2_get_transaction()
120 static inline void update_t_max_wait(transaction_t *transaction, in update_t_max_wait() argument
125 if (time_after(transaction->t_start, ts)) { in update_t_max_wait()
126 newts = jbd2_time_diff(ts, transaction->t_start); in update_t_max_wait()
127 oldts = READ_ONCE(transaction->t_max_wait); in update_t_max_wait()
129 oldts = cmpxchg(&transaction->t_max_wait, oldts, newts); in update_t_max_wait()
134 * Wait until running transaction passes to T_FLUSH state and new transaction
136 * running transaction to exist and releases j_state_lock.
157 * Wait until running transaction transitions from T_SWITCH to T_FLUSH
158 * state and new transaction can thus be started. The function releases
190 /* Maximum number of blocks for user transaction payload */
198 * Wait until we can add credits for handle to the running transaction. Called
200 * transaction. Returns 1 if we had to wait, j_state_lock is dropped, and
217 * If the current transaction is locked down for commit, wait in add_transaction_credits()
235 * If the current transaction is already too large, in add_transaction_credits()
237 * attach this handle to a new transaction. in add_transaction_credits()
242 * Is the number of reserved credits in the current transaction too in add_transaction_credits()
265 * associated with a committing transaction creates a deadlock, in add_transaction_credits()
270 * in the new transaction. in add_transaction_credits()
290 /* We allow at most half of a transaction to be reserved */ in add_transaction_credits()
308 * to begin. Attach the handle to a transaction and set up the
309 * transaction's buffer credits.
315 transaction_t *transaction, *new_transaction = NULL; in start_this_handle() local
324 * Limit the number of reserved credits to 1/2 of maximum transaction in start_this_handle()
326 * transaction size per operation. in start_this_handle()
341 * transaction early if there are high chances we'll need it. If we in start_this_handle()
342 * guess wrong, we'll retry or free unused transaction. in start_this_handle()
374 * Wait on the journal's transaction barrier if necessary. Specifically in start_this_handle()
399 transaction = journal->j_running_transaction; in start_this_handle()
414 * transaction and we don't have to check for transaction size in start_this_handle()
416 * transaction is being switched to a committing one as it in start_this_handle()
419 if (transaction->t_state == T_SWITCH) { in start_this_handle()
428 * use and add the handle to the running transaction. in start_this_handle()
430 update_t_max_wait(transaction, ts); in start_this_handle()
431 handle->h_transaction = transaction; in start_this_handle()
435 atomic_inc(&transaction->t_updates); in start_this_handle()
436 atomic_inc(&transaction->t_handle_count); in start_this_handle()
439 atomic_read(&transaction->t_outstanding_credits), in start_this_handle()
447 * Ensure that no allocations done while the transaction is open are in start_this_handle()
521 * @journal: Journal to start transaction on.
524 * We make sure that the transaction can guarantee at least nblocks of
528 * stored in h_rsv_handle. It is not attached to any particular transaction
529 * and thus doesn't block transaction commit. If the caller uses this reserved
558 /* Get j_state_lock to pin running transaction if it exists */ in jbd2_journal_free_reserved()
573 * This attaches @handle to the running transaction (or creates one if there's
574 * not transaction running). Unlike jbd2_journal_start() this function cannot
639 * return code > 0 implies normal transaction-full status.
643 transaction_t *transaction = handle->h_transaction; in jbd2_journal_extend() local
650 journal = transaction->t_journal; in jbd2_journal_extend()
656 /* Don't extend a locked-down transaction! */ in jbd2_journal_extend()
657 if (transaction->t_state != T_RUNNING) { in jbd2_journal_extend()
659 "transaction not running\n", handle, nblocks); in jbd2_journal_extend()
670 &transaction->t_outstanding_credits); in jbd2_journal_extend()
674 "transaction too large\n", handle, nblocks); in jbd2_journal_extend()
675 atomic_sub(nblocks, &transaction->t_outstanding_credits); in jbd2_journal_extend()
680 transaction->t_tid, in jbd2_journal_extend()
699 transaction_t *transaction = handle->h_transaction; in stop_this_handle() local
700 journal_t *journal = transaction->t_journal; in stop_this_handle()
704 J_ASSERT(atomic_read(&transaction->t_updates) > 0); in stop_this_handle()
709 * transaction will really need as large sequences of transactions with in stop_this_handle()
720 &transaction->t_outstanding_revokes); in stop_this_handle()
727 &transaction->t_outstanding_credits); in stop_this_handle()
730 transaction); in stop_this_handle()
731 if (atomic_dec_and_test(&transaction->t_updates)) in stop_this_handle()
749 * Restart a handle for a multi-transaction filesystem
754 * handle's transaction so far and reattach the handle to a new
755 * transaction capable of guaranteeing the requested number of
762 transaction_t *transaction = handle->h_transaction; in jbd2__journal_restart() local
772 journal = transaction->t_journal; in jbd2__journal_restart()
773 tid = transaction->t_tid; in jbd2__journal_restart()
776 * First unlink the handle from its current transaction, and start the in jbd2__journal_restart()
822 * Note that the running transaction can get freed under us if in jbd2_journal_wait_updates()
823 * this transaction is getting committed in in jbd2_journal_wait_updates()
829 * lead to use-after-free of old freed transaction. in jbd2_journal_wait_updates()
831 transaction_t *transaction = journal->j_running_transaction; in jbd2_journal_wait_updates() local
833 if (!transaction) in jbd2_journal_wait_updates()
838 if (!atomic_read(&transaction->t_updates)) { in jbd2_journal_wait_updates()
850 * jbd2_journal_lock_updates () - establish a transaction barrier.
892 * Release a transaction barrier obtained with jbd2_journal_lock_updates().
937 * If the buffer is already part of the current transaction, then there
939 * transaction which we are still committing to disk, then we need to
943 * part of the transaction, that is).
951 transaction_t *transaction = handle->h_transaction; in do_get_write_access() local
957 journal = transaction->t_journal; in do_get_write_access()
1017 * The buffer is already part of this transaction if b_transaction or in do_get_write_access()
1020 if (jh->b_transaction == transaction || in do_get_write_access()
1021 jh->b_next_transaction == transaction) { in do_get_write_access()
1027 * this is the first time this transaction is touching this buffer, in do_get_write_access()
1038 JBUFFER_TRACE(jh, "no transaction"); in do_get_write_access()
1043 * visible before attaching it to the running transaction. in do_get_write_access()
1059 __jbd2_journal_file_buffer(jh, transaction, BJ_Reserved); in do_get_write_access()
1076 JBUFFER_TRACE(jh, "owned by older transaction"); in do_get_write_access()
1082 * committing transaction is currently writing this buffer out to disk in do_get_write_access()
1097 * Only do the copy if the currently-owning transaction still needs it. in do_get_write_access()
1098 * If buffer isn't on BJ_Metadata list, the committing transaction is in do_get_write_access()
1105 * committed_data record after the transaction, so we HAVE to force the in do_get_write_access()
1124 * before attaching it to the running transaction. Paired with barrier in do_get_write_access()
1128 jh->b_next_transaction = transaction; in do_get_write_access()
1147 /* Fast check whether buffer is already attached to the required transaction */
1162 * we see jh attached to the running transaction, we know it must stay in jbd2_write_access_granted()
1163 * so until the transaction is committed. Thus jh won't be freed and in jbd2_write_access_granted()
1165 * happen jh gets freed, reallocated, and attached to the transaction in jbd2_write_access_granted()
1185 * detect when jh went through free, realloc, attach to transaction in jbd2_write_access_granted()
1203 * @handle: transaction to add buffer modifications to
1253 * the bh is not already part of an existing transaction.
1261 * @handle: transaction to new buffer to
1268 transaction_t *transaction = handle->h_transaction; in jbd2_journal_get_create_access() local
1277 journal = transaction->t_journal; in jbd2_journal_get_create_access()
1282 * The buffer may already belong to this transaction due to pre-zeroing in jbd2_journal_get_create_access()
1284 * committing transaction's lists, but it HAS to be in Forget state in in jbd2_journal_get_create_access()
1285 * that case: the transaction must have deleted the buffer for it to be in jbd2_journal_get_create_access()
1289 J_ASSERT_JH(jh, (jh->b_transaction == transaction || in jbd2_journal_get_create_access()
1303 * the buffer so the transaction freeing it must have in jbd2_journal_get_create_access()
1307 /* first access by this transaction */ in jbd2_journal_get_create_access()
1312 __jbd2_journal_file_buffer(jh, transaction, BJ_Reserved); in jbd2_journal_get_create_access()
1315 /* first access by this transaction */ in jbd2_journal_get_create_access()
1318 JBUFFER_TRACE(jh, "set next transaction"); in jbd2_journal_get_create_access()
1320 jh->b_next_transaction = transaction; in jbd2_journal_get_create_access()
1342 * @handle: transaction
1358 * We never need to know which transaction the committed data is part
1360 * will be committed to a new transaction in due course, at which point
1423 * a running transaction will match the buffer in that transaction.
1460 * @handle: transaction to add buffer to.
1464 * transaction.
1470 * The buffer is placed on the transaction's metadata list and is marked
1471 * as belonging to the transaction.
1476 * current committing transaction (in which case we should have frozen
1478 * buffer: that only gets done when the old transaction finally
1483 transaction_t *transaction = handle->h_transaction; in jbd2_journal_dirty_metadata() local
1493 * of the running transaction. in jbd2_journal_dirty_metadata()
1505 if (data_race(jh->b_transaction != transaction && in jbd2_journal_dirty_metadata()
1506 jh->b_next_transaction != transaction)) { in jbd2_journal_dirty_metadata()
1508 J_ASSERT_JH(jh, jh->b_transaction == transaction || in jbd2_journal_dirty_metadata()
1509 jh->b_next_transaction == transaction); in jbd2_journal_dirty_metadata()
1513 /* If it's in our transaction it must be in BJ_Metadata list. */ in jbd2_journal_dirty_metadata()
1514 if (data_race(jh->b_transaction == transaction && in jbd2_journal_dirty_metadata()
1517 if (jh->b_transaction == transaction && in jbd2_journal_dirty_metadata()
1524 J_ASSERT_JH(jh, jh->b_transaction != transaction || in jbd2_journal_dirty_metadata()
1531 journal = transaction->t_journal; in jbd2_journal_dirty_metadata()
1538 * 'jh->b_next_transaction' during old transaction in jbd2_journal_dirty_metadata()
1549 * of the transaction. This needs to be done in jbd2_journal_dirty_metadata()
1550 * once a transaction -bzzz in jbd2_journal_dirty_metadata()
1562 * on the running transaction's metadata list there is nothing to do. in jbd2_journal_dirty_metadata()
1567 if (jh->b_transaction == transaction && jh->b_jlist == BJ_Metadata) { in jbd2_journal_dirty_metadata()
1589 * Metadata already on the current transaction list doesn't in jbd2_journal_dirty_metadata()
1590 * need to be filed. Metadata on another transaction's list must in jbd2_journal_dirty_metadata()
1594 if (jh->b_transaction != transaction) { in jbd2_journal_dirty_metadata()
1595 JBUFFER_TRACE(jh, "already on other transaction"); in jbd2_journal_dirty_metadata()
1598 (jh->b_next_transaction != transaction))) { in jbd2_journal_dirty_metadata()
1601 "transaction (%p, %u), " in jbd2_journal_dirty_metadata()
1606 transaction, transaction->t_tid, in jbd2_journal_dirty_metadata()
1618 * transaction's data buffer, ever. */ in jbd2_journal_dirty_metadata()
1627 __jbd2_journal_file_buffer(jh, transaction, BJ_Metadata); in jbd2_journal_dirty_metadata()
1638 * @handle: transaction handle
1642 * buffer. If the buffer is dirty in the current running transaction we
1655 transaction_t *transaction = handle->h_transaction; in jbd2_journal_forget() local
1664 journal = transaction->t_journal; in jbd2_journal_forget()
1684 /* keep track of whether or not this transaction modified us */ in jbd2_journal_forget()
1688 * The buffer's going from the transaction, we must drop in jbd2_journal_forget()
1693 if (jh->b_transaction == transaction) { in jbd2_journal_forget()
1697 * of this transaction, then we can just drop it from in jbd2_journal_forget()
1698 * the transaction immediately. */ in jbd2_journal_forget()
1702 JBUFFER_TRACE(jh, "belongs to current transaction: unfile"); in jbd2_journal_forget()
1705 * we only want to drop a reference if this transaction in jbd2_journal_forget()
1713 * However, the commit of this transaction is still in jbd2_journal_forget()
1726 __jbd2_journal_file_buffer(jh, transaction, BJ_Forget); in jbd2_journal_forget()
1736 * (committing) transaction, we can't drop it yet... */ in jbd2_journal_forget()
1737 JBUFFER_TRACE(jh, "belongs to older transaction"); in jbd2_journal_forget()
1738 /* ... but we CAN drop it from the new transaction through in jbd2_journal_forget()
1740 * the new transaction, so that not only the commit code in jbd2_journal_forget()
1743 * after the new transaction commits. */ in jbd2_journal_forget()
1749 jh->b_next_transaction = transaction; in jbd2_journal_forget()
1752 J_ASSERT(jh->b_next_transaction == transaction); in jbd2_journal_forget()
1755 * only drop a reference if this transaction modified in jbd2_journal_forget()
1764 * transaction, we can just drop it now if it has no in jbd2_journal_forget()
1769 JBUFFER_TRACE(jh, "belongs to none transaction"); in jbd2_journal_forget()
1785 * attach this buffer to current transaction so that the in jbd2_journal_forget()
1787 * transaction commits. in jbd2_journal_forget()
1790 __jbd2_journal_file_buffer(jh, transaction, BJ_Forget); in jbd2_journal_forget()
1805 * jbd2_journal_stop() - complete a transaction
1806 * @handle: transaction to complete.
1811 * buffer credits to the transaction and remove the handle. The only
1818 * transaction began.
1822 transaction_t *transaction = handle->h_transaction; in jbd2_journal_stop() local
1835 if (!transaction) { in jbd2_journal_stop()
1837 * Handle is already detached from the transaction so there is in jbd2_journal_stop()
1843 journal = transaction->t_journal; in jbd2_journal_stop()
1844 tid = transaction->t_tid; in jbd2_journal_stop()
1858 * Implement synchronous transaction batching. If the handle in jbd2_journal_stop()
1861 * transaction. Keep doing that while new threads continue to in jbd2_journal_stop()
1870 * and wait for the transaction to be committed than it is to in jbd2_journal_stop()
1872 * join the transaction. We achieve this by measuring how in jbd2_journal_stop()
1873 * long it takes to commit a transaction, and compare it with in jbd2_journal_stop()
1874 * how long this transaction has been running, and if run time in jbd2_journal_stop()
1898 transaction->t_start_time)); in jbd2_journal_stop()
1914 transaction->t_synchronous_commit = 1; in jbd2_journal_stop()
1918 * going! We also want to force a commit if the transaction is too in jbd2_journal_stop()
1922 time_after_eq(jiffies, transaction->t_expires)) { in jbd2_journal_stop()
1927 jbd2_debug(2, "transaction too old, requesting commit for " in jbd2_journal_stop()
1941 * Once stop_this_handle() drops t_updates, the transaction could start in jbd2_journal_stop()
1943 * dereference transaction pointer again after calling in jbd2_journal_stop()
1961 * transaction buffer lists.
1966 * Append a buffer to a transaction list, given the transaction's list head
1990 * Remove a buffer from a transaction list, given the transaction's list
2011 * Remove a buffer from the appropriate transaction list.
2024 transaction_t *transaction; in __jbd2_journal_temp_unlink_buffer() local
2028 transaction = jh->b_transaction; in __jbd2_journal_temp_unlink_buffer()
2029 if (transaction) in __jbd2_journal_temp_unlink_buffer()
2030 assert_spin_locked(&transaction->t_journal->j_list_lock); in __jbd2_journal_temp_unlink_buffer()
2034 J_ASSERT_JH(jh, transaction != NULL); in __jbd2_journal_temp_unlink_buffer()
2040 transaction->t_nr_buffers--; in __jbd2_journal_temp_unlink_buffer()
2041 J_ASSERT_JH(jh, transaction->t_nr_buffers >= 0); in __jbd2_journal_temp_unlink_buffer()
2042 list = &transaction->t_buffers; in __jbd2_journal_temp_unlink_buffer()
2045 list = &transaction->t_forget; in __jbd2_journal_temp_unlink_buffer()
2048 list = &transaction->t_shadow_list; in __jbd2_journal_temp_unlink_buffer()
2051 list = &transaction->t_reserved_list; in __jbd2_journal_temp_unlink_buffer()
2057 if (transaction && is_journal_aborted(transaction->t_journal)) in __jbd2_journal_temp_unlink_buffer()
2065 * the jh reference that belonged to the transaction.
2094 * running transaction's ->t_datalist via __jbd2_journal_unfile_buffer.
2108 * while the data is part of a transaction. Yes?
2154 * This buffer is no longer needed. If it is on an older transaction's
2155 * checkpoint list we need to record it on this transaction's forget list
2156 * to pin this buffer (and hence its checkpointing transaction) down until
2157 * this transaction commits. If the buffer isn't on a checkpoint list, we
2165 static int __dispose_buffer(struct journal_head *jh, transaction_t *transaction) in __dispose_buffer() argument
2171 JBUFFER_TRACE(jh, "on running+cp transaction"); in __dispose_buffer()
2179 __jbd2_journal_file_buffer(jh, transaction, BJ_Forget); in __dispose_buffer()
2182 JBUFFER_TRACE(jh, "on running transaction"); in __dispose_buffer()
2202 * attached to the current transaction: once the transaction commits,
2206 * previous, committing transaction!
2209 * transaction (and which therefore cannot be discarded immediately) are
2210 * not going to be reused in the new running transaction
2213 * allocated in one transaction and removed in the next will be marked
2215 * the next transaction to delete the block commits. This means that
2224 * transaction commit --- so it is always safe just to discard data
2231 * transaction.
2233 * We're outside-transaction here. Either or both of j_running_transaction
2239 transaction_t *transaction; in journal_unmap_buffer() local
2262 * transaction adding inode to orphan list (let's call it T) in journal_unmap_buffer()
2263 * is committed. Otherwise if the transaction changing the in journal_unmap_buffer()
2268 * transaction marking the buffer as freed in the filesystem in journal_unmap_buffer()
2273 * the buffer to BJ_Forget list of the newest transaction. in journal_unmap_buffer()
2281 * the transaction this buffer was modified in. in journal_unmap_buffer()
2283 transaction = jh->b_transaction; in journal_unmap_buffer()
2284 if (transaction == NULL) { in journal_unmap_buffer()
2285 /* First case: not on any transaction. If it in journal_unmap_buffer()
2290 JBUFFER_TRACE(jh, "not on any transaction: zap"); in journal_unmap_buffer()
2305 /* ... and once the current transaction has in journal_unmap_buffer()
2313 /* There is no currently-running transaction. So the in journal_unmap_buffer()
2316 * the committing transaction, if it exists. */ in journal_unmap_buffer()
2323 /* The orphan record's transaction has in journal_unmap_buffer()
2330 } else if (transaction == journal->j_committing_transaction) { in journal_unmap_buffer()
2331 JBUFFER_TRACE(jh, "on committing transaction"); in journal_unmap_buffer()
2349 * b_modified to not confuse transaction credit accounting, and in journal_unmap_buffer()
2350 * set j_next_transaction to the running transaction (if there in journal_unmap_buffer()
2364 /* Good, the buffer belongs to the running transaction. in journal_unmap_buffer()
2365 * We are writing our own transaction's data, not any in journal_unmap_buffer()
2370 J_ASSERT_JH(jh, transaction == journal->j_running_transaction); in journal_unmap_buffer()
2371 JBUFFER_TRACE(jh, "on running transaction"); in journal_unmap_buffer()
2372 may_free = __dispose_buffer(jh, transaction); in journal_unmap_buffer()
2380 * running transaction, journal_get_write_access() won't clear in journal_unmap_buffer()
2409 * Can return -EBUSY if buffers are part of the committing transaction and
2465 * File a buffer on the given transaction list.
2468 transaction_t *transaction, int jlist) in __jbd2_journal_file_buffer() argument
2475 assert_spin_locked(&transaction->t_journal->j_list_lock); in __jbd2_journal_file_buffer()
2478 J_ASSERT_JH(jh, jh->b_transaction == transaction || in __jbd2_journal_file_buffer()
2504 jh->b_transaction = transaction; in __jbd2_journal_file_buffer()
2512 transaction->t_nr_buffers++; in __jbd2_journal_file_buffer()
2513 list = &transaction->t_buffers; in __jbd2_journal_file_buffer()
2516 list = &transaction->t_forget; in __jbd2_journal_file_buffer()
2519 list = &transaction->t_shadow_list; in __jbd2_journal_file_buffer()
2522 list = &transaction->t_reserved_list; in __jbd2_journal_file_buffer()
2534 transaction_t *transaction, int jlist) in jbd2_journal_file_buffer() argument
2537 spin_lock(&transaction->t_journal->j_list_lock); in jbd2_journal_file_buffer()
2538 __jbd2_journal_file_buffer(jh, transaction, jlist); in jbd2_journal_file_buffer()
2539 spin_unlock(&transaction->t_journal->j_list_lock); in jbd2_journal_file_buffer()
2545 * dropping it from its current transaction entirely. If the buffer has
2546 * already started to be used by a subsequent transaction, refile the
2547 * buffer on that transaction's metadata list.
2552 * When this function returns true, there's no next transaction to refile to
2572 * It has been modified by a later transaction: add it to the new in __jbd2_journal_refile_buffer()
2573 * transaction's metadata list. in __jbd2_journal_refile_buffer()
2626 * File inode in the inode list of the handle's transaction
2631 transaction_t *transaction = handle->h_transaction; in jbd2_journal_file_inode() local
2636 journal = transaction->t_journal; in jbd2_journal_file_inode()
2639 transaction->t_tid); in jbd2_journal_file_inode()
2653 if (jinode->i_transaction == transaction || in jbd2_journal_file_inode()
2654 jinode->i_next_transaction == transaction) in jbd2_journal_file_inode()
2662 if (!transaction->t_need_data_flush) in jbd2_journal_file_inode()
2663 transaction->t_need_data_flush = 1; in jbd2_journal_file_inode()
2664 /* On some different transaction's list - should be in jbd2_journal_file_inode()
2670 jinode->i_next_transaction = transaction; in jbd2_journal_file_inode()
2673 /* Not on any transaction list... */ in jbd2_journal_file_inode()
2675 jinode->i_transaction = transaction; in jbd2_journal_file_inode()
2676 list_add(&jinode->i_list, &transaction->t_inode_list); in jbd2_journal_file_inode()
2699 * File truncate and transaction commit interact with each other in a
2700 * non-trivial way. If a transaction writing data block A is
2702 * written them. Otherwise if we crashed after the transaction with
2703 * write has committed but before the transaction with truncate has
2706 * part in case it is in the committing transaction.
2712 * committing the transaction after this function has been called but
2713 * before a transaction for truncate is started (and furthermore it
2715 * happens in the same transaction as write --- we don't have to write
2729 * enough that the transaction was not committing before we started in jbd2_journal_begin_ordered_truncate()
2730 * a transaction adding the inode to orphan list */ in jbd2_journal_begin_ordered_truncate()