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authorHarshad Shirwadkar <harshadshirwadkar@gmail.com>2020-10-15 23:37:55 +0300
committerTheodore Ts'o <tytso@mit.edu>2020-10-22 06:22:26 +0300
commit6866d7b3f2bb4f011041ba54c98b1584497fe2fd (patch)
tree4ae01bbb3dc62134eaaea5e8324da97bcb117224 /fs/jbd2
parent995a3ed67fc8c0e3301a770016fb66f1bbf15ec8 (diff)
downloadlinux-6866d7b3f2bb4f011041ba54c98b1584497fe2fd.tar.xz
ext4 / jbd2: add fast commit initialization
This patch adds fast commit area trackers in the journal_t structure. These are initialized via the jbd2_fc_init() routine that this patch adds. This patch also adds ext4/fast_commit.c and ext4/fast_commit.h files for fast commit code that will be added in subsequent patches in this series. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-4-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/journal.c53
1 files changed, 48 insertions, 5 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index c0600405e7a2..4497bfbac527 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1181,6 +1181,14 @@ static journal_t *journal_init_common(struct block_device *bdev,
if (!journal->j_wbuf)
goto err_cleanup;
+ if (journal->j_fc_wbufsize > 0) {
+ journal->j_fc_wbuf = kmalloc_array(journal->j_fc_wbufsize,
+ sizeof(struct buffer_head *),
+ GFP_KERNEL);
+ if (!journal->j_fc_wbuf)
+ goto err_cleanup;
+ }
+
bh = getblk_unmovable(journal->j_dev, start, journal->j_blocksize);
if (!bh) {
pr_err("%s: Cannot get buffer for journal superblock\n",
@@ -1194,11 +1202,23 @@ static journal_t *journal_init_common(struct block_device *bdev,
err_cleanup:
kfree(journal->j_wbuf);
+ kfree(journal->j_fc_wbuf);
jbd2_journal_destroy_revoke(journal);
kfree(journal);
return NULL;
}
+int jbd2_fc_init(journal_t *journal, int num_fc_blks)
+{
+ journal->j_fc_wbufsize = num_fc_blks;
+ journal->j_fc_wbuf = kmalloc_array(journal->j_fc_wbufsize,
+ sizeof(struct buffer_head *), GFP_KERNEL);
+ if (!journal->j_fc_wbuf)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL(jbd2_fc_init);
+
/* jbd2_journal_init_dev and jbd2_journal_init_inode:
*
* Create a journal structure assigned some fixed set of disk blocks to
@@ -1316,11 +1336,20 @@ static int journal_reset(journal_t *journal)
}
journal->j_first = first;
- journal->j_last = last;
- journal->j_head = first;
- journal->j_tail = first;
- journal->j_free = last - first;
+ if (jbd2_has_feature_fast_commit(journal) &&
+ journal->j_fc_wbufsize > 0) {
+ journal->j_fc_last = last;
+ journal->j_last = last - journal->j_fc_wbufsize;
+ journal->j_fc_first = journal->j_last + 1;
+ journal->j_fc_off = 0;
+ } else {
+ journal->j_last = last;
+ }
+
+ journal->j_head = journal->j_first;
+ journal->j_tail = journal->j_first;
+ journal->j_free = journal->j_last - journal->j_first;
journal->j_tail_sequence = journal->j_transaction_sequence;
journal->j_commit_sequence = journal->j_transaction_sequence - 1;
@@ -1665,9 +1694,18 @@ static int load_superblock(journal_t *journal)
journal->j_tail_sequence = be32_to_cpu(sb->s_sequence);
journal->j_tail = be32_to_cpu(sb->s_start);
journal->j_first = be32_to_cpu(sb->s_first);
- journal->j_last = be32_to_cpu(sb->s_maxlen);
journal->j_errno = be32_to_cpu(sb->s_errno);
+ if (jbd2_has_feature_fast_commit(journal) &&
+ journal->j_fc_wbufsize > 0) {
+ journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
+ journal->j_last = journal->j_fc_last - journal->j_fc_wbufsize;
+ journal->j_fc_first = journal->j_last + 1;
+ journal->j_fc_off = 0;
+ } else {
+ journal->j_last = be32_to_cpu(sb->s_maxlen);
+ }
+
return 0;
}
@@ -1728,6 +1766,9 @@ int jbd2_journal_load(journal_t *journal)
*/
journal->j_flags &= ~JBD2_ABORT;
+ if (journal->j_fc_wbufsize > 0)
+ jbd2_journal_set_features(journal, 0, 0,
+ JBD2_FEATURE_INCOMPAT_FAST_COMMIT);
/* OK, we've finished with the dynamic journal bits:
* reinitialise the dynamic contents of the superblock in memory
* and reset them on disk. */
@@ -1811,6 +1852,8 @@ int jbd2_journal_destroy(journal_t *journal)
jbd2_journal_destroy_revoke(journal);
if (journal->j_chksum_driver)
crypto_free_shash(journal->j_chksum_driver);
+ if (journal->j_fc_wbufsize > 0)
+ kfree(journal->j_fc_wbuf);
kfree(journal->j_wbuf);
kfree(journal);