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Date: Fri, 10 Mar 2023 20:52:05 +0800
From: Zhihao Cheng <chengzhihao1@...wei.com>
To: <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.com>
CC: <linux-ext4@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<chengzhihao1@...wei.com>, <yi.zhang@...wei.com>
Subject: [PATCH 4/5] jbd2: factor out journal initialization from journal_get_superblock()
From: Zhang Yi <yi.zhang@...wei.com>
Current journal_get_superblock() couple journal superblock checking and
partial journal initialization, factor out initialization part from it
to make things clear.
Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
---
fs/jbd2/journal.c | 52 ++++++++++++++++++++---------------------------
1 file changed, 22 insertions(+), 30 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index b991d5c21d16..cd94d068b4e6 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1921,26 +1921,15 @@ static int journal_get_superblock(journal_t *journal)
printk(KERN_WARNING "JBD2: no valid journal superblock found\n");
goto out;
}
-
- switch(be32_to_cpu(sb->s_header.h_blocktype)) {
- case JBD2_SUPERBLOCK_V1:
- journal->j_format_version = 1;
- break;
- case JBD2_SUPERBLOCK_V2:
- journal->j_format_version = 2;
- break;
- default:
+ if (be32_to_cpu(sb->s_header.h_blocktype) != JBD2_SUPERBLOCK_V1 &&
+ be32_to_cpu(sb->s_header.h_blocktype) != JBD2_SUPERBLOCK_V2) {
printk(KERN_WARNING "JBD2: unrecognised superblock format ID\n");
goto out;
}
-
- if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
- journal->j_total_len = be32_to_cpu(sb->s_maxlen);
- else if (be32_to_cpu(sb->s_maxlen) > journal->j_total_len) {
+ if (be32_to_cpu(sb->s_maxlen) > journal->j_total_len) {
printk(KERN_WARNING "JBD2: journal file too short\n");
goto out;
}
-
if (be32_to_cpu(sb->s_first) == 0 ||
be32_to_cpu(sb->s_first) >= journal->j_total_len) {
printk(KERN_WARNING
@@ -1956,7 +1945,6 @@ static int journal_get_superblock(journal_t *journal)
"at the same time!\n");
goto out;
}
-
if (jbd2_journal_has_csum_v2or3_feature(journal) &&
jbd2_has_feature_checksum(journal)) {
/* Can't have checksum v1 and v2 on at the same time! */
@@ -1964,12 +1952,10 @@ static int journal_get_superblock(journal_t *journal)
"at the same time!\n");
goto out;
}
-
if (!jbd2_verify_csum_type(journal, sb)) {
printk(KERN_ERR "JBD2: Unknown checksum type\n");
goto out;
}
-
/* Load the checksum driver */
if (jbd2_journal_has_csum_v2or3_feature(journal)) {
journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
@@ -1979,25 +1965,14 @@ static int journal_get_superblock(journal_t *journal)
journal->j_chksum_driver = NULL;
goto out;
}
- }
-
- if (jbd2_journal_has_csum_v2or3(journal)) {
/* Check superblock checksum */
if (sb->s_checksum != jbd2_superblock_csum(journal, sb)) {
printk(KERN_ERR "JBD2: journal checksum error\n");
err = -EFSBADCRC;
goto out;
}
-
- /* Precompute checksum seed for all metadata */
- journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
- sizeof(sb->s_uuid));
}
-
- journal->j_revoke_records_per_block =
- journal_revoke_records_per_block(journal);
set_buffer_verified(bh);
-
return 0;
out:
@@ -2022,12 +1997,30 @@ static int load_superblock(journal_t *journal)
sb = journal->j_superblock;
+ switch (be32_to_cpu(sb->s_header.h_blocktype)) {
+ case JBD2_SUPERBLOCK_V1:
+ journal->j_format_version = 1;
+ break;
+ case JBD2_SUPERBLOCK_V2:
+ journal->j_format_version = 2;
+ break;
+ }
+
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_errno = be32_to_cpu(sb->s_errno);
journal->j_last = be32_to_cpu(sb->s_maxlen);
+ if (be32_to_cpu(sb->s_maxlen) < journal->j_total_len)
+ journal->j_total_len = be32_to_cpu(sb->s_maxlen);
+ /* Precompute checksum seed for all metadata */
+ if (jbd2_journal_has_csum_v2or3(journal))
+ journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
+ sizeof(sb->s_uuid));
+ journal->j_revoke_records_per_block =
+ journal_revoke_records_per_block(journal);
+
if (jbd2_has_feature_fast_commit(journal)) {
journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
num_fc_blocks = jbd2_journal_get_num_fc_blks(sb);
@@ -2223,8 +2216,7 @@ int jbd2_journal_check_used_features(journal_t *journal, unsigned long compat,
if (!compat && !ro && !incompat)
return 1;
/* Load journal superblock if it is not loaded yet. */
- if (journal->j_format_version == 0 &&
- journal_get_superblock(journal) != 0)
+ if (journal_get_superblock(journal))
return 0;
if (!jbd2_format_support_feature(journal))
return 0;
--
2.31.1
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