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Date: Mon, 18 Sep 2023 17:57:30 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Alexey Lyashkov <alexey.lyashkov@...il.com>
Cc: linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
Artem Blagodarenko <artem.blagodarenko@...il.com>
Subject: Re: [PATCH 4/5] remove an e2fsck context from bh emulation code.
On Aug 4, 2022, at 3:56 AM, Alexey Lyashkov <alexey.lyashkov@...il.com> wrote:
>
> In order to generalize a journal handing, remove a e2fsck context
> from generic structures like buffer_head, and device.
> But fast commit code want a e2fsck context as well, so move it pointer
> to journal struct.
Missing Signed-off-by: line.
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
> e2fsck/journal.c | 46 ++++++++++++++++++++---------------------
> lib/ext2fs/jfs_compat.h | 2 ++
> lib/support/jfs_user.h | 12 -----------
> 3 files changed, 25 insertions(+), 35 deletions(-)
>
> diff --git a/e2fsck/journal.c b/e2fsck/journal.c
> index 682d82a4..728f5a24 100644
> --- a/e2fsck/journal.c
> +++ b/e2fsck/journal.c
> @@ -58,7 +58,7 @@ int jbd2_journal_bmap(journal_t *journal, unsigned long block,
> return 0;
> }
>
> - retval= ext2fs_bmap2(inode->i_ctx->fs, inode->i_ino,
> + retval= ext2fs_bmap2(inode->i_fs, inode->i_ino,
> &inode->i_ext2, NULL, 0, (blk64_t) block,
> 0, &pblk);
> *phys = pblk;
> @@ -70,11 +70,12 @@ struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
> int blocksize)
> {
> struct buffer_head *bh;
> - int bufsize = sizeof(*bh) + kdev->k_ctx->fs->blocksize -
> + int bufsize = sizeof(*bh) + kdev->k_fs->blocksize -
> sizeof(bh->b_data);
> + errcode_t retval;
>
> - bh = e2fsck_allocate_memory(kdev->k_ctx, bufsize, "block buffer");
> - if (!bh)
> + retval = ext2fs_get_memzero(bufsize, &bh);
> + if (retval)
> return NULL;
>
> if (journal_enable_debug >= 3)
> @@ -82,11 +83,11 @@ struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
> jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
> blocknr, blocksize, bh_count);
>
> - bh->b_ctx = kdev->k_ctx;
> + bh->b_fs = kdev->k_fs;
> if (kdev->k_dev == K_DEV_FS)
> - bh->b_io = kdev->k_ctx->fs->io;
> + bh->b_io = kdev->k_fs->io;
> else
> - bh->b_io = kdev->k_ctx->fs->journal_io;
> + bh->b_io = kdev->k_fs->journal_io;
> bh->b_size = blocksize;
> bh->b_blocknr = blocknr;
>
> @@ -98,9 +99,9 @@ int sync_blockdev(kdev_t kdev)
> io_channel io;
>
> if (kdev->k_dev == K_DEV_FS)
> - io = kdev->k_ctx->fs->io;
> + io = kdev->k_fs->io;
> else
> - io = kdev->k_ctx->fs->journal_io;
> + io = kdev->k_fs->journal_io;
>
> return io_channel_flush(io) ? -EIO : 0;
> }
> @@ -120,7 +121,7 @@ void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
> bh->b_blocknr,
> 1, bh->b_data);
> if (retval) {
> - com_err(bh->b_ctx->device_name, retval,
> + com_err(bh->b_fs->device_name, retval,
> "while reading block %llu\n",
> bh->b_blocknr);
> bh->b_err = (int) retval;
> @@ -135,7 +136,7 @@ void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
> bh->b_blocknr,
> 1, bh->b_data);
> if (retval) {
> - com_err(bh->b_ctx->device_name, retval,
> + com_err(bh->b_fs->device_name, retval,
> "while writing block %llu\n",
> bh->b_blocknr);
> bh->b_err = (int) retval;
> @@ -223,7 +224,7 @@ static int process_journal_block(ext2_filsys fs,
> static int ext4_fc_replay_scan(journal_t *j, struct buffer_head *bh,
> int off, tid_t expected_tid)
> {
> - e2fsck_t ctx = j->j_fs_dev->k_ctx;
> + e2fsck_t ctx = j->j_ctx;
> struct e2fsck_fc_replay_state *state;
> int ret = JBD2_FC_REPLAY_CONTINUE;
> struct ext4_fc_add_range ext;
> @@ -796,7 +797,7 @@ static int ext4_fc_handle_del_range(e2fsck_t ctx, __u8 *val)
> static int ext4_fc_replay(journal_t *journal, struct buffer_head *bh,
> enum passtype pass, int off, tid_t expected_tid)
> {
> - e2fsck_t ctx = journal->j_fs_dev->k_ctx;
> + e2fsck_t ctx = journal->j_ctx;
> struct e2fsck_fc_replay_state *state = &ctx->fc_replay_state;
> int ret = JBD2_FC_REPLAY_CONTINUE;
> struct ext4_fc_tl tl;
> @@ -924,10 +925,11 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
> }
> dev_journal = dev_fs+1;
>
> - dev_fs->k_ctx = dev_journal->k_ctx = ctx;
> + dev_fs->k_fs = dev_journal->k_fs = ctx->fs;
> dev_fs->k_dev = K_DEV_FS;
> dev_journal->k_dev = K_DEV_JOURNAL;
>
> + journal->j_ctx = ctx;
> journal->j_dev = dev_journal;
> journal->j_fs_dev = dev_fs;
> journal->j_inode = NULL;
> @@ -945,7 +947,7 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
> goto errout;
> }
>
> - j_inode->i_ctx = ctx;
> + j_inode->i_fs = ctx->fs;
> j_inode->i_ino = sb->s_journal_inum;
>
> if ((retval = ext2fs_read_inode(ctx->fs,
> @@ -1186,9 +1188,8 @@ static errcode_t e2fsck_journal_fix_bad_inode(e2fsck_t ctx,
> }
>
> #define V1_SB_SIZE 0x0024
> -static void clear_v2_journal_fields(journal_t *journal)
> +static void clear_v2_journal_fields(e2fsck_t ctx, journal_t *journal)
> {
> - e2fsck_t ctx = journal->j_dev->k_ctx;
> struct problem_context pctx;
>
> clear_problem_context(&pctx);
> @@ -1203,9 +1204,8 @@ static void clear_v2_journal_fields(journal_t *journal)
> }
>
>
> -static errcode_t e2fsck_journal_load(journal_t *journal)
> +static errcode_t e2fsck_journal_load(e2fsck_t ctx, journal_t *journal)
> {
> - e2fsck_t ctx = journal->j_dev->k_ctx;
> journal_superblock_t *jsb;
> struct buffer_head *jbh = journal->j_sb_buffer;
> struct problem_context pctx;
> @@ -1231,14 +1231,14 @@ static errcode_t e2fsck_journal_load(journal_t *journal)
> jsb->s_feature_incompat ||
> jsb->s_feature_ro_compat ||
> jsb->s_nr_users)
> - clear_v2_journal_fields(journal);
> + clear_v2_journal_fields(ctx, journal);
> break;
>
> case JBD2_SUPERBLOCK_V2:
> journal->j_format_version = 2;
> if (ntohl(jsb->s_nr_users) > 1 &&
> uuid_is_null(ctx->fs->super->s_journal_uuid))
> - clear_v2_journal_fields(journal);
> + clear_v2_journal_fields(ctx, journal);
> if (ntohl(jsb->s_nr_users) > 1) {
> fix_problem(ctx, PR_0_JOURNAL_UNSUPP_MULTIFS, &pctx);
> return EXT2_ET_JOURNAL_UNSUPP_VERSION;
> @@ -1425,7 +1425,7 @@ errcode_t e2fsck_check_ext3_journal(e2fsck_t ctx)
> return retval;
> }
>
> - retval = e2fsck_journal_load(journal);
> + retval = e2fsck_journal_load(ctx, journal);
> if (retval) {
> if ((retval == EXT2_ET_CORRUPT_JOURNAL_SB) ||
> ((retval == EXT2_ET_UNSUPP_FEATURE) &&
> @@ -1543,7 +1543,7 @@ static errcode_t recover_ext3_journal(e2fsck_t ctx)
> if (retval)
> return retval;
>
> - retval = e2fsck_journal_load(journal);
> + retval = e2fsck_journal_load(ctx, journal);
> if (retval)
> goto errout;
>
> diff --git a/lib/ext2fs/jfs_compat.h b/lib/ext2fs/jfs_compat.h
> index e11cf494..bfafae12 100644
> --- a/lib/ext2fs/jfs_compat.h
> +++ b/lib/ext2fs/jfs_compat.h
> @@ -41,6 +41,7 @@ typedef struct kdev_s *kdev_t;
>
> struct buffer_head;
> struct inode;
> +struct e2fsck_struct;
>
> typedef unsigned int gfp_t;
> #define GFP_KERNEL 0
> @@ -98,6 +99,7 @@ struct journal_s
> struct jbd2_revoke_table_s *j_revoke_table[2];
> tid_t j_failed_commit;
> __u32 j_csum_seed;
> + struct e2fsck_struct * j_ctx;
> int (*j_fc_replay_callback)(struct journal_s *journal,
> struct buffer_head *bh,
> enum passtype pass, int off,
> diff --git a/lib/support/jfs_user.h b/lib/support/jfs_user.h
> index b9c2fa54..bb392811 100644
> --- a/lib/support/jfs_user.h
> +++ b/lib/support/jfs_user.h
> @@ -40,11 +40,7 @@
> #endif
>
> struct buffer_head {
> -#ifdef DEBUGFS
> ext2_filsys b_fs;
> -#else
> - e2fsck_t b_ctx;
> -#endif
> io_channel b_io;
> int b_size;
> int b_err;
> @@ -55,21 +51,13 @@ struct buffer_head {
> };
>
> struct inode {
> -#ifdef DEBUGFS
> ext2_filsys i_fs;
> -#else
> - e2fsck_t i_ctx;
> -#endif
> ext2_ino_t i_ino;
> struct ext2_inode i_ext2;
> };
>
> struct kdev_s {
> -#ifdef DEBUGFS
> ext2_filsys k_fs;
> -#else
> - e2fsck_t k_ctx;
> -#endif
> int k_dev;
> };
>
> --
> 2.31.1
>
Cheers, Andreas
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