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Message-Id: <8C896C64-232E-4B9F-B3A6-45F5B00F96FA@dilger.ca>
Date: Wed, 9 Jul 2014 14:33:45 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Azat Khuzhin <a3at.mail@...il.com>
Cc: darrick.wong@...cle.com, linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH 1/3 v3] journal: use consts instead of 1024 and add helper for journal with 1k blocksize
On Jul 9, 2014, at 1:39 PM, Azat Khuzhin <a3at.mail@...il.com> wrote:
> Use EXT2_MIN_BLOCK_SIZE/JFS_MIN_JOURNAL_BLOCKS instead of hardcoded 1024
> when it is okay, and also add a helper ext2fs_journal_sb_start() that
> will return start of journal sb with special case for fs with 1k block
> size.
>
> Signed-off-by: Azat Khuzhin <a3at.mail@...il.com>
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
> v2: missed htonl() (thanks to Andreas Dilger)
> v3: use SUPERBLOCK_OFFSET instead of EXT2_MIN_BLOCK_SIZE (thanks to Darrick J.
> Wong)
>
> e2fsck/journal.c | 5 ++---
> lib/ext2fs/ext2fs.h | 1 +
> lib/ext2fs/mkjournal.c | 28 ++++++++++++++++------------
> misc/tune2fs.c | 6 +++---
> 4 files changed, 22 insertions(+), 18 deletions(-)
>
> diff --git a/e2fsck/journal.c b/e2fsck/journal.c
> index a7b1150..6df0165 100644
> --- a/e2fsck/journal.c
> +++ b/e2fsck/journal.c
> @@ -443,8 +443,7 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
> if (ext_journal) {
> blk64_t maxlen;
>
> - if (ctx->fs->blocksize == 1024)
> - start = 1;
> + start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1;
> bh = getblk(dev_journal, start, ctx->fs->blocksize);
> if (!bh) {
> retval = EXT2_ET_NO_MEMORY;
> @@ -455,7 +454,7 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
> brelse(bh);
> goto errout;
> }
> - memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024,
> + memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET,
> sizeof(jsuper));
> brelse(bh);
> #ifdef WORDS_BIGENDIAN
> diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
> index 599c972..a759741 100644
> --- a/lib/ext2fs/ext2fs.h
> +++ b/lib/ext2fs/ext2fs.h
> @@ -1498,6 +1498,7 @@ extern errcode_t ext2fs_add_journal_inode(ext2_filsys fs, blk_t num_blocks,
> extern errcode_t ext2fs_add_journal_inode2(ext2_filsys fs, blk_t num_blocks,
> blk64_t goal, int flags);
> extern int ext2fs_default_journal_size(__u64 num_blocks);
> +extern int ext2fs_journal_sb_start(int blocksize);
>
> /* openfs.c */
> extern errcode_t ext2fs_open(const char *name, int flags, int superblock,
> diff --git a/lib/ext2fs/mkjournal.c b/lib/ext2fs/mkjournal.c
> index 884d9c0..0ad674d 100644
> --- a/lib/ext2fs/mkjournal.c
> +++ b/lib/ext2fs/mkjournal.c
> @@ -49,7 +49,7 @@ errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
> errcode_t retval;
> journal_superblock_t *jsb;
>
> - if (num_blocks < 1024)
> + if (num_blocks < JFS_MIN_JOURNAL_BLOCKS)
> return EXT2_ET_JOURNAL_TOO_SMALL;
>
> if ((retval = ext2fs_get_mem(fs->blocksize, &jsb)))
> @@ -75,10 +75,7 @@ errcode_t ext2fs_create_journal_superblock(ext2_filsys fs,
> if (fs->super->s_feature_incompat &
> EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
> jsb->s_nr_users = 0;
> - if (fs->blocksize == 1024)
> - jsb->s_first = htonl(3);
> - else
> - jsb->s_first = htonl(2);
> + jsb->s_first = htonl(ext2fs_journal_sb_start(fs->blocksize) + 1);
> }
>
> *ret_jsb = (char *) jsb;
> @@ -430,6 +427,13 @@ int ext2fs_default_journal_size(__u64 num_blocks)
> return 32768;
> }
>
> +int ext2fs_journal_sb_start(int blocksize)
> +{
> + if (blocksize == EXT2_MIN_BLOCK_SIZE)
> + return 2;
> + return 1;
> +}
> +
> /*
> * This function adds a journal device to a filesystem
> */
> @@ -437,7 +441,7 @@ errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
> {
> struct stat st;
> errcode_t retval;
> - char buf[1024];
> + char buf[SUPERBLOCK_SIZE];
> journal_superblock_t *jsb;
> int start;
> __u32 i, nr_users;
> @@ -450,10 +454,9 @@ errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
> return EXT2_ET_JOURNAL_NOT_BLOCK; /* Must be a block device */
>
> /* Get the journal superblock */
> - start = 1;
> - if (journal_dev->blocksize == 1024)
> - start++;
> - if ((retval = io_channel_read_blk64(journal_dev->io, start, -1024,
> + start = ext2fs_journal_sb_start(journal_dev->blocksize);
> + if ((retval = io_channel_read_blk64(journal_dev->io, start,
> + -SUPERBLOCK_SIZE,
> buf)))
> return retval;
>
> @@ -479,7 +482,8 @@ errcode_t ext2fs_add_journal_device(ext2_filsys fs, ext2_filsys journal_dev)
> }
>
> /* Writeback the journal superblock */
> - if ((retval = io_channel_write_blk64(journal_dev->io, start, -1024, buf)))
> + if ((retval = io_channel_write_blk64(journal_dev->io, start,
> + -SUPERBLOCK_SIZE, buf)))
> return retval;
>
> fs->super->s_journal_inum = 0;
> @@ -632,7 +636,7 @@ main(int argc, char **argv)
> exit(1);
> }
>
> - retval = ext2fs_add_journal_inode(fs, 1024, 0);
> + retval = ext2fs_add_journal_inode(fs, JFS_MIN_JOURNAL_BLOCKS, 0);
> if (retval) {
> com_err(argv[0], retval, "while adding journal to %s",
> device_name);
> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> index d95cc3d..0e7caf2 100644
> --- a/misc/tune2fs.c
> +++ b/misc/tune2fs.c
> @@ -187,7 +187,7 @@ static int remove_journal_device(ext2_filsys fs)
> {
> char *journal_path;
> ext2_filsys jfs;
> - char buf[1024];
> + char buf[SUPERBLOCK_SIZE];
> journal_superblock_t *jsb;
> int i, nr_users;
> errcode_t retval;
> @@ -230,7 +230,7 @@ static int remove_journal_device(ext2_filsys fs)
> }
>
> /* Get the journal superblock */
> - if ((retval = io_channel_read_blk64(jfs->io, 1, -1024, buf))) {
> + if ((retval = io_channel_read_blk64(jfs->io, 1, -SUPERBLOCK_SIZE, buf))) {
> com_err(program_name, retval, "%s",
> _("while reading journal superblock"));
> goto no_valid_journal;
> @@ -261,7 +261,7 @@ static int remove_journal_device(ext2_filsys fs)
> jsb->s_nr_users = htonl(nr_users);
>
> /* Write back the journal superblock */
> - if ((retval = io_channel_write_blk64(jfs->io, 1, -1024, buf))) {
> + if ((retval = io_channel_write_blk64(jfs->io, 1, -SUPERBLOCK_SIZE, buf))) {
> com_err(program_name, retval,
> "while writing journal superblock.");
> goto no_valid_journal;
> --
> 2.0.0
>
Cheers, Andreas
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