transaction.c (5804c19b80bf625c6a9925317f845e497434d6d3) transaction.c (b81c3758c1df0c308ba8b28934fcd63d9dba9c41)
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * linux/fs/jbd2/transaction.c
4 *
5 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
6 *
7 * Copyright 1998 Red Hat corp --- All Rights Reserved
8 *

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58void jbd2_journal_free_transaction(transaction_t *transaction)
59{
60 if (unlikely(ZERO_OR_NULL_PTR(transaction)))
61 return;
62 kmem_cache_free(transaction_cache, transaction);
63}
64
65/*
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * linux/fs/jbd2/transaction.c
4 *
5 * Written by Stephen C. Tweedie <sct@redhat.com>, 1998
6 *
7 * Copyright 1998 Red Hat corp --- All Rights Reserved
8 *

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58void jbd2_journal_free_transaction(transaction_t *transaction)
59{
60 if (unlikely(ZERO_OR_NULL_PTR(transaction)))
61 return;
62 kmem_cache_free(transaction_cache, transaction);
63}
64
65/*
66 * Base amount of descriptor blocks we reserve for each transaction.
67 */
68static int jbd2_descriptor_blocks_per_trans(journal_t *journal)
69{
70 int tag_space = journal->j_blocksize - sizeof(journal_header_t);
71 int tags_per_block;
72
73 /* Subtract UUID */
74 tag_space -= 16;
75 if (jbd2_journal_has_csum_v2or3(journal))
76 tag_space -= sizeof(struct jbd2_journal_block_tail);
77 /* Commit code leaves a slack space of 16 bytes at the end of block */
78 tags_per_block = (tag_space - 16) / journal_tag_bytes(journal);
79 /*
80 * Revoke descriptors are accounted separately so we need to reserve
81 * space for commit block and normal transaction descriptor blocks.
82 */
83 return 1 + DIV_ROUND_UP(journal->j_max_transaction_buffers,
84 tags_per_block);
85}
86
87/*
88 * jbd2_get_transaction: obtain a new transaction_t object.
89 *
90 * Simply initialise a new transaction. Initialize it in
91 * RUNNING state and add it to the current journal (which should not
92 * have an existing running transaction: we only make a new transaction
93 * once we have started to commit the old one).
94 *
95 * Preconditions:

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104{
105 transaction->t_journal = journal;
106 transaction->t_state = T_RUNNING;
107 transaction->t_start_time = ktime_get();
108 transaction->t_tid = journal->j_transaction_sequence++;
109 transaction->t_expires = jiffies + journal->j_commit_interval;
110 atomic_set(&transaction->t_updates, 0);
111 atomic_set(&transaction->t_outstanding_credits,
66 * jbd2_get_transaction: obtain a new transaction_t object.
67 *
68 * Simply initialise a new transaction. Initialize it in
69 * RUNNING state and add it to the current journal (which should not
70 * have an existing running transaction: we only make a new transaction
71 * once we have started to commit the old one).
72 *
73 * Preconditions:

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82{
83 transaction->t_journal = journal;
84 transaction->t_state = T_RUNNING;
85 transaction->t_start_time = ktime_get();
86 transaction->t_tid = journal->j_transaction_sequence++;
87 transaction->t_expires = jiffies + journal->j_commit_interval;
88 atomic_set(&transaction->t_updates, 0);
89 atomic_set(&transaction->t_outstanding_credits,
112 jbd2_descriptor_blocks_per_trans(journal) +
90 journal->j_transaction_overhead_buffers +
113 atomic_read(&journal->j_reserved_credits));
114 atomic_set(&transaction->t_outstanding_revokes, 0);
115 atomic_set(&transaction->t_handle_count, 0);
116 INIT_LIST_HEAD(&transaction->t_inode_list);
117 INIT_LIST_HEAD(&transaction->t_private_list);
118
119 /* Set up the commit timer for the new transaction. */
120 journal->j_commit_timer.expires = round_jiffies_up(transaction->t_expires);

--- 2645 unchanged lines hidden --- 		91 atomic_read(&journal->j_reserved_credits));
92 atomic_set(&transaction->t_outstanding_revokes, 0);
93 atomic_set(&transaction->t_handle_count, 0);
94 INIT_LIST_HEAD(&transaction->t_inode_list);
95 INIT_LIST_HEAD(&transaction->t_private_list);
96
97 /* Set up the commit timer for the new transaction. */
98 journal->j_commit_timer.expires = round_jiffies_up(transaction->t_expires);

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