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Message-Id: <FD9BAC55-489C-4F98-B6DF-58939741ABD8@dilger.ca>
Date: Mon, 18 Sep 2023 18:04:07 -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 5/5] deduplicate a buffer_head / kernel device code.
On Aug 4, 2022, at 3:56 AM, Alexey Lyashkov <alexey.lyashkov@...il.com> wrote:
>
> move a buffer_head and device code into libsupport.
Missing Signed-off-by: line, but looks fine otherwise.
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
--
This patch was pushed before 1.47.0 was released, so debugfs/journal.c
is still missing the ext4_fc_replay*() code only in e2fsck/journal.c,
but at least it removes much of the duplication between these files.
We _might_ be able to merge the rest of this code into a single file with
something tricky, like having the fix_problem() calls handled via function
pointers in the journal context for e2fsck_journal_load() and similar,
and do nothing in the debugfs case. I haven't looked into that yet.
Cheers, Andreas
> ---
> debugfs/journal.c | 147 -----------------------------------------
> e2fsck/journal.c | 143 ---------------------------------------
> lib/support/jfs_user.c | 142 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 142 insertions(+), 290 deletions(-)
>
> diff --git a/debugfs/journal.c b/debugfs/journal.c
> index 202312fe..510a0acb 100644
> --- a/debugfs/journal.c
> +++ b/debugfs/journal.c
> @@ -26,8 +26,6 @@
> #include "uuid/uuid.h"
> #include "journal.h"
>
> -static int bh_count = 0;
> -
> #if EXT2_FLAT_INCLUDES
> #include "blkid.h"
> #else
> @@ -47,151 +45,6 @@ static int bh_count = 0;
> * to use the recovery.c file virtually unchanged from the kernel, so we
> * don't have to do much to keep kernel and user recovery in sync.
> */
> -int jbd2_journal_bmap(journal_t *journal, unsigned long block,
> - unsigned long long *phys)
> -{
> -#ifdef USE_INODE_IO
> - *phys = block;
> - return 0;
> -#else
> - struct inode *inode = journal->j_inode;
> - errcode_t retval;
> - blk64_t pblk;
> -
> - if (!inode) {
> - *phys = block;
> - return 0;
> - }
> -
> - retval = ext2fs_bmap2(inode->i_fs, inode->i_ino,
> - &inode->i_ext2, NULL, 0, (blk64_t) block,
> - 0, &pblk);
> - *phys = pblk;
> - return (int) retval;
> -#endif
> -}
> -
> -struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
> - int blocksize)
> -{
> - struct buffer_head *bh;
> - int bufsize = sizeof(*bh) + kdev->k_fs->blocksize -
> - sizeof(bh->b_data);
> - errcode_t retval;
> -
> - retval = ext2fs_get_memzero(bufsize, &bh);
> - if (retval)
> - return NULL;
> -
> - if (journal_enable_debug >= 3)
> - bh_count++;
> - jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
> - blocknr, blocksize, bh_count);
> -
> - bh->b_fs = kdev->k_fs;
> - if (kdev->k_dev == K_DEV_FS)
> - bh->b_io = kdev->k_fs->io;
> - else
> - bh->b_io = kdev->k_fs->journal_io;
> - bh->b_size = blocksize;
> - bh->b_blocknr = blocknr;
> -
> - return bh;
> -}
> -
> -int sync_blockdev(kdev_t kdev)
> -{
> - io_channel io;
> -
> - if (kdev->k_dev == K_DEV_FS)
> - io = kdev->k_fs->io;
> - else
> - io = kdev->k_fs->journal_io;
> -
> - return io_channel_flush(io) ? EIO : 0;
> -}
> -
> -void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
> - struct buffer_head *bhp[])
> -{
> - errcode_t retval;
> - struct buffer_head *bh;
> -
> - for (; nr > 0; --nr) {
> - bh = *bhp++;
> - if (rw == REQ_OP_READ && !bh->b_uptodate) {
> - jfs_debug(3, "reading block %llu/%p\n",
> - bh->b_blocknr, (void *) bh);
> - retval = io_channel_read_blk64(bh->b_io,
> - bh->b_blocknr,
> - 1, bh->b_data);
> - if (retval) {
> - com_err(bh->b_fs->device_name, retval,
> - "while reading block %llu\n",
> - bh->b_blocknr);
> - bh->b_err = (int) retval;
> - continue;
> - }
> - bh->b_uptodate = 1;
> - } else if (rw == REQ_OP_WRITE && bh->b_dirty) {
> - jfs_debug(3, "writing block %llu/%p\n",
> - bh->b_blocknr,
> - (void *) bh);
> - retval = io_channel_write_blk64(bh->b_io,
> - bh->b_blocknr,
> - 1, bh->b_data);
> - if (retval) {
> - com_err(bh->b_fs->device_name, retval,
> - "while writing block %llu\n",
> - bh->b_blocknr);
> - bh->b_err = (int) retval;
> - continue;
> - }
> - bh->b_dirty = 0;
> - bh->b_uptodate = 1;
> - } else {
> - jfs_debug(3, "no-op %s for block %llu\n",
> - rw == REQ_OP_READ ? "read" : "write",
> - bh->b_blocknr);
> - }
> - }
> -}
> -
> -void mark_buffer_dirty(struct buffer_head *bh)
> -{
> - bh->b_dirty = 1;
> -}
> -
> -static void mark_buffer_clean(struct buffer_head *bh)
> -{
> - bh->b_dirty = 0;
> -}
> -
> -void brelse(struct buffer_head *bh)
> -{
> - if (bh->b_dirty)
> - ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
> - jfs_debug(3, "freeing block %llu/%p (total %d)\n",
> - bh->b_blocknr, (void *) bh, --bh_count);
> - ext2fs_free_mem(&bh);
> -}
> -
> -int buffer_uptodate(struct buffer_head *bh)
> -{
> - return bh->b_uptodate;
> -}
> -
> -void mark_buffer_uptodate(struct buffer_head *bh, int val)
> -{
> - bh->b_uptodate = val;
> -}
> -
> -void wait_on_buffer(struct buffer_head *bh)
> -{
> - if (!bh->b_uptodate)
> - ll_rw_block(REQ_OP_READ, 0, 1, &bh);
> -}
> -
>
> static void ext2fs_clear_recover(ext2_filsys fs, int error)
> {
> diff --git a/e2fsck/journal.c b/e2fsck/journal.c
> index 728f5a24..9ff1dc94 100644
> --- a/e2fsck/journal.c
> +++ b/e2fsck/journal.c
> @@ -27,8 +27,6 @@
> #include "problem.h"
> #include "uuid/uuid.h"
>
> -static int bh_count = 0;
> -
> /*
> * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
> * This creates a larger static binary, and a smaller binary using
> @@ -42,147 +40,6 @@ static int bh_count = 0;
> * to use the recovery.c file virtually unchanged from the kernel, so we
> * don't have to do much to keep kernel and user recovery in sync.
> */
> -int jbd2_journal_bmap(journal_t *journal, unsigned long block,
> - unsigned long long *phys)
> -{
> -#ifdef USE_INODE_IO
> - *phys = block;
> - return 0;
> -#else
> - struct inode *inode = journal->j_inode;
> - errcode_t retval;
> - blk64_t pblk;
> -
> - if (!inode) {
> - *phys = block;
> - return 0;
> - }
> -
> - retval= ext2fs_bmap2(inode->i_fs, inode->i_ino,
> - &inode->i_ext2, NULL, 0, (blk64_t) block,
> - 0, &pblk);
> - *phys = pblk;
> - return -1 * ((int) retval);
> -#endif
> -}
> -
> -struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
> - int blocksize)
> -{
> - struct buffer_head *bh;
> - int bufsize = sizeof(*bh) + kdev->k_fs->blocksize -
> - sizeof(bh->b_data);
> - errcode_t retval;
> -
> - retval = ext2fs_get_memzero(bufsize, &bh);
> - if (retval)
> - return NULL;
> -
> - if (journal_enable_debug >= 3)
> - bh_count++;
> - jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
> - blocknr, blocksize, bh_count);
> -
> - bh->b_fs = kdev->k_fs;
> - if (kdev->k_dev == K_DEV_FS)
> - bh->b_io = kdev->k_fs->io;
> - else
> - bh->b_io = kdev->k_fs->journal_io;
> - bh->b_size = blocksize;
> - bh->b_blocknr = blocknr;
> -
> - return bh;
> -}
> -
> -int sync_blockdev(kdev_t kdev)
> -{
> - io_channel io;
> -
> - if (kdev->k_dev == K_DEV_FS)
> - io = kdev->k_fs->io;
> - else
> - io = kdev->k_fs->journal_io;
> -
> - return io_channel_flush(io) ? -EIO : 0;
> -}
> -
> -void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
> - struct buffer_head *bhp[])
> -{
> - errcode_t retval;
> - struct buffer_head *bh;
> -
> - for (; nr > 0; --nr) {
> - bh = *bhp++;
> - if (rw == REQ_OP_READ && !bh->b_uptodate) {
> - jfs_debug(3, "reading block %llu/%p\n",
> - bh->b_blocknr, (void *) bh);
> - retval = io_channel_read_blk64(bh->b_io,
> - bh->b_blocknr,
> - 1, bh->b_data);
> - if (retval) {
> - com_err(bh->b_fs->device_name, retval,
> - "while reading block %llu\n",
> - bh->b_blocknr);
> - bh->b_err = (int) retval;
> - continue;
> - }
> - bh->b_uptodate = 1;
> - } else if (rw == REQ_OP_WRITE && bh->b_dirty) {
> - jfs_debug(3, "writing block %llu/%p\n",
> - bh->b_blocknr,
> - (void *) bh);
> - retval = io_channel_write_blk64(bh->b_io,
> - bh->b_blocknr,
> - 1, bh->b_data);
> - if (retval) {
> - com_err(bh->b_fs->device_name, retval,
> - "while writing block %llu\n",
> - bh->b_blocknr);
> - bh->b_err = (int) retval;
> - continue;
> - }
> - bh->b_dirty = 0;
> - bh->b_uptodate = 1;
> - } else {
> - jfs_debug(3, "no-op %s for block %llu\n",
> - rw == REQ_OP_READ ? "read" : "write",
> - bh->b_blocknr);
> - }
> - }
> -}
> -
> -void mark_buffer_dirty(struct buffer_head *bh)
> -{
> - bh->b_dirty = 1;
> -}
> -
> -void brelse(struct buffer_head *bh)
> -{
> - if (bh->b_dirty)
> - ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
> - jfs_debug(3, "freeing block %llu/%p (total %d)\n",
> - bh->b_blocknr, (void *) bh, --bh_count);
> - ext2fs_free_mem(&bh);
> -}
> -
> -int buffer_uptodate(struct buffer_head *bh)
> -{
> - return bh->b_uptodate;
> -}
> -
> -void mark_buffer_uptodate(struct buffer_head *bh, int val)
> -{
> - bh->b_uptodate = val;
> -}
> -
> -void wait_on_buffer(struct buffer_head *bh)
> -{
> - if (!bh->b_uptodate)
> - ll_rw_block(REQ_OP_READ, 0, 1, &bh);
> -}
> -
> -
> static void e2fsck_clear_recover(e2fsck_t ctx, int error)
> {
> ext2fs_clear_feature_journal_needs_recovery(ctx->fs->super);
> diff --git a/lib/support/jfs_user.c b/lib/support/jfs_user.c
> index d8a2f842..26f0090b 100644
> --- a/lib/support/jfs_user.c
> +++ b/lib/support/jfs_user.c
> @@ -1,6 +1,8 @@
> #define DEBUGFS
> #include "jfs_user.h"
>
> +static int bh_count = 0;
> +
> /*
> * Define USE_INODE_IO to use the inode_io.c / fileio.c codepaths.
> * This creates a larger static binary, and a smaller binary using
> @@ -60,12 +62,116 @@ errcode_t ext2fs_journal_sb_csum_set(journal_t *j,
> return 0;
> }
>
> +void mark_buffer_dirty(struct buffer_head *bh)
> +{
> + bh->b_dirty = 1;
> +}
> +
> +int buffer_uptodate(struct buffer_head *bh)
> +{
> + return bh->b_uptodate;
> +}
> +
> +void mark_buffer_uptodate(struct buffer_head *bh, int val)
> +{
> + bh->b_uptodate = val;
> +}
> +
> +void wait_on_buffer(struct buffer_head *bh)
> +{
> + if (!bh->b_uptodate)
> + ll_rw_block(REQ_OP_READ, 0, 1, &bh);
> +}
>
> static void mark_buffer_clean(struct buffer_head * bh)
> {
> bh->b_dirty = 0;
> }
>
> +struct buffer_head *getblk(kdev_t kdev, unsigned long long blocknr,
> + int blocksize)
> +{
> + struct buffer_head *bh;
> + int bufsize = sizeof(*bh) + kdev->k_fs->blocksize -
> + sizeof(bh->b_data);
> + errcode_t retval;
> +
> + retval = ext2fs_get_memzero(bufsize, &bh);
> + if (retval)
> + return NULL;
> +
> + if (journal_enable_debug >= 3)
> + bh_count++;
> + jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
> + blocknr, blocksize, bh_count);
> +
> + bh->b_fs = kdev->k_fs;
> + if (kdev->k_dev == K_DEV_FS)
> + bh->b_io = kdev->k_fs->io;
> + else
> + bh->b_io = kdev->k_fs->journal_io;
> + bh->b_size = blocksize;
> + bh->b_blocknr = blocknr;
> +
> + return bh;
> +}
> +
> +void brelse(struct buffer_head *bh)
> +{
> + if (bh->b_dirty)
> + ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
> + jfs_debug(3, "freeing block %llu/%p (total %d)\n",
> + bh->b_blocknr, (void *) bh, --bh_count);
> + ext2fs_free_mem(&bh);
> +}
> +
> +void ll_rw_block(int rw, int op_flags EXT2FS_ATTR((unused)), int nr,
> + struct buffer_head *bhp[])
> +{
> + errcode_t retval;
> + struct buffer_head *bh;
> +
> + for (; nr > 0; --nr) {
> + bh = *bhp++;
> + if (rw == REQ_OP_READ && !bh->b_uptodate) {
> + jfs_debug(3, "reading block %llu/%p\n",
> + bh->b_blocknr, (void *) bh);
> + retval = io_channel_read_blk64(bh->b_io,
> + bh->b_blocknr,
> + 1, bh->b_data);
> + if (retval) {
> + com_err(bh->b_fs->device_name, retval,
> + "while reading block %llu\n",
> + bh->b_blocknr);
> + bh->b_err = (int) retval;
> + continue;
> + }
> + bh->b_uptodate = 1;
> + } else if (rw == REQ_OP_WRITE && bh->b_dirty) {
> + jfs_debug(3, "writing block %llu/%p\n",
> + bh->b_blocknr,
> + (void *) bh);
> + retval = io_channel_write_blk64(bh->b_io,
> + bh->b_blocknr,
> + 1, bh->b_data);
> + if (retval) {
> + com_err(bh->b_fs->device_name, retval,
> + "while writing block %llu\n",
> + bh->b_blocknr);
> + bh->b_err = (int) retval;
> + continue;
> + }
> + bh->b_dirty = 0;
> + bh->b_uptodate = 1;
> + } else {
> + jfs_debug(3, "no-op %s for block %llu\n",
> + rw == REQ_OP_READ ? "read" : "write",
> + bh->b_blocknr);
> + }
> + }
> +}
> +
> +
> void ext2fs_journal_release(ext2_filsys fs, journal_t *journal,
> int reset, int drop)
> {
> @@ -99,3 +205,39 @@ void ext2fs_journal_release(ext2_filsys fs, journal_t *journal,
> ext2fs_free_mem(&journal->j_fs_dev);
> ext2fs_free_mem(&journal);
> }
> +
> +int jbd2_journal_bmap(journal_t *journal, unsigned long block,
> + unsigned long long *phys)
> +{
> +#ifdef USE_INODE_IO
> + *phys = block;
> + return 0;
> +#else
> + struct inode *inode = journal->j_inode;
> + errcode_t retval;
> + blk64_t pblk;
> +
> + if (!inode) {
> + *phys = block;
> + return 0;
> + }
> +
> + retval = ext2fs_bmap2(inode->i_fs, inode->i_ino,
> + &inode->i_ext2, NULL, 0, (blk64_t) block,
> + 0, &pblk);
> + *phys = pblk;
> + return (int) retval;
> +#endif
> +}
> +
> +int sync_blockdev(kdev_t kdev)
> +{
> + io_channel io;
> +
> + if (kdev->k_dev == K_DEV_FS)
> + io = kdev->k_fs->io;
> + else
> + io = kdev->k_fs->journal_io;
> +
> + return io_channel_flush(io) ? EIO : 0;
> +}
> --
> 2.31.1
>
Cheers, Andreas
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