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Date: Thu, 10 Aug 2023 12:02:04 +0200
From: Jan Kara <jack@...e.cz>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, tytso@....edu,
adilger.kernel@...ger.ca, jack@...e.cz, yi.zhang@...wei.com,
yukuai3@...wei.com
Subject: Re: [PATCH v2 06/12] jbd2: cleanup load_superblock()
On Thu 10-08-23 16:54:11, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
>
> Rename load_superblock() to journal_load_superblock(), move getting and
> reading superblock from journal_init_common() and
> journal_get_superblock() to this function, and also rename
> journal_get_superblock() to journal_check_superblock(), make it a pure
> check helper to check superblock validity from disk.
>
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
Looks good. Feel free to add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/jbd2/journal.c | 85 +++++++++++++++++++----------------------------
> 1 file changed, 35 insertions(+), 50 deletions(-)
>
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 46ab47b4439e..a8d17070073b 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -1341,45 +1341,29 @@ static void journal_fail_superblock(journal_t *journal)
> }
>
> /*
> - * Read the superblock for a given journal, performing initial
> + * Check the superblock for a given journal, performing initial
> * validation of the format.
> */
> -static int journal_get_superblock(journal_t *journal)
> +static int journal_check_superblock(journal_t *journal)
> {
> - struct buffer_head *bh;
> - journal_superblock_t *sb;
> - int err;
> -
> - bh = journal->j_sb_buffer;
> -
> - J_ASSERT(bh != NULL);
> -
> - err = bh_read(bh, 0);
> - if (err < 0) {
> - printk(KERN_ERR
> - "JBD2: IO error reading journal superblock\n");
> - goto out;
> - }
> -
> - sb = journal->j_superblock;
> -
> - err = -EINVAL;
> + journal_superblock_t *sb = journal->j_superblock;
> + int err = -EINVAL;
>
> if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) ||
> sb->s_blocksize != cpu_to_be32(journal->j_blocksize)) {
> printk(KERN_WARNING "JBD2: no valid journal superblock found\n");
> - goto out;
> + return err;
> }
>
> 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;
> + return err;
> }
>
> if (be32_to_cpu(sb->s_maxlen) > journal->j_total_len) {
> printk(KERN_WARNING "JBD2: journal file too short\n");
> - goto out;
> + return err;
> }
>
> if (be32_to_cpu(sb->s_first) == 0 ||
> @@ -1387,7 +1371,7 @@ static int journal_get_superblock(journal_t *journal)
> printk(KERN_WARNING
> "JBD2: Invalid start block of journal: %u\n",
> be32_to_cpu(sb->s_first));
> - goto out;
> + return err;
> }
>
> /*
> @@ -1402,7 +1386,7 @@ static int journal_get_superblock(journal_t *journal)
> (sb->s_feature_incompat &
> ~cpu_to_be32(JBD2_KNOWN_INCOMPAT_FEATURES))) {
> printk(KERN_WARNING "JBD2: Unrecognised features on journal\n");
> - goto out;
> + return err;
> }
>
> if (jbd2_has_feature_csum2(journal) &&
> @@ -1410,7 +1394,7 @@ static int journal_get_superblock(journal_t *journal)
> /* Can't have checksum v2 and v3 at the same time! */
> printk(KERN_ERR "JBD2: Can't enable checksumming v2 and v3 "
> "at the same time!\n");
> - goto out;
> + return err;
> }
>
> if (jbd2_journal_has_csum_v2or3_feature(journal) &&
> @@ -1418,14 +1402,14 @@ static int journal_get_superblock(journal_t *journal)
> /* Can't have checksum v1 and v2 on at the same time! */
> printk(KERN_ERR "JBD2: Can't enable checksumming v1 and v2/3 "
> "at the same time!\n");
> - goto out;
> + return err;
> }
>
> /* Load the checksum driver */
> if (jbd2_journal_has_csum_v2or3_feature(journal)) {
> if (sb->s_checksum_type != JBD2_CRC32C_CHKSUM) {
> printk(KERN_ERR "JBD2: Unknown checksum type\n");
> - goto out;
> + return err;
> }
>
> journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
> @@ -1433,20 +1417,17 @@ static int journal_get_superblock(journal_t *journal)
> printk(KERN_ERR "JBD2: Cannot load crc32c driver.\n");
> err = PTR_ERR(journal->j_chksum_driver);
> journal->j_chksum_driver = NULL;
> - goto out;
> + return err;
> }
> /* Check superblock checksum */
> if (sb->s_checksum != jbd2_superblock_csum(journal, sb)) {
> printk(KERN_ERR "JBD2: journal checksum error\n");
> err = -EFSBADCRC;
> - goto out;
> + return err;
> }
> }
> - return 0;
>
> -out:
> - journal_fail_superblock(journal);
> - return err;
> + return 0;
> }
>
> static int journal_revoke_records_per_block(journal_t *journal)
> @@ -1468,17 +1449,31 @@ static int journal_revoke_records_per_block(journal_t *journal)
> * Load the on-disk journal superblock and read the key fields into the
> * journal_t.
> */
> -static int load_superblock(journal_t *journal)
> +static int journal_load_superblock(journal_t *journal)
> {
> int err;
> + struct buffer_head *bh;
> journal_superblock_t *sb;
> int num_fc_blocks;
>
> - err = journal_get_superblock(journal);
> - if (err)
> - return err;
> + bh = getblk_unmovable(journal->j_dev, journal->j_blk_offset,
> + journal->j_blocksize);
> + if (bh)
> + err = bh_read(bh, 0);
> + if (!bh || err < 0) {
> + pr_err("%s: Cannot read journal superblock\n", __func__);
> + brelse(bh);
> + return -EIO;
> + }
>
> - sb = journal->j_superblock;
> + journal->j_sb_buffer = bh;
> + sb = (journal_superblock_t *)bh->b_data;
> + journal->j_superblock = sb;
> + err = journal_check_superblock(journal);
> + if (err) {
> + journal_fail_superblock(journal);
> + return err;
> + }
>
> journal->j_tail_sequence = be32_to_cpu(sb->s_sequence);
> journal->j_tail = be32_to_cpu(sb->s_start);
> @@ -1524,7 +1519,6 @@ static journal_t *journal_init_common(struct block_device *bdev,
> static struct lock_class_key jbd2_trans_commit_key;
> journal_t *journal;
> int err;
> - struct buffer_head *bh;
> int n;
>
> journal = kzalloc(sizeof(*journal), GFP_KERNEL);
> @@ -1577,16 +1571,7 @@ static journal_t *journal_init_common(struct block_device *bdev,
> if (!journal->j_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",
> - __func__);
> - goto err_cleanup;
> - }
> - journal->j_sb_buffer = bh;
> - journal->j_superblock = (journal_superblock_t *)bh->b_data;
> -
> - err = load_superblock(journal);
> + err = journal_load_superblock(journal);
> if (err)
> goto err_cleanup;
>
> --
> 2.34.3
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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