> The nobh option was only supported for writeback mode, but given that all
> write paths (except mmapped writed) actually create buffer heads, it
> effectively was a no-op already.
Thanks. Merged into my tree.
Honza
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
>
> Index: linux-2.6/fs/ext3/inode.c
> ===================================================================
> --- linux-2.6.orig/fs/ext3/inode.c 2010-06-07 09:56:07.519275527 +0200
> +++ linux-2.6/fs/ext3/inode.c 2010-06-07 09:56:35.267022978 +0200
> @@ -1625,10 +1625,7 @@ static int ext3_writeback_writepage(stru
> goto out_fail;
> }
>
> - if (test_opt(inode->i_sb, NOBH) && ext3_should_writeback_data(inode))
> - ret = nobh_writepage(page, ext3_get_block, wbc);
> - else
> - ret = block_write_full_page(page, ext3_get_block, wbc);
> + ret = block_write_full_page(page, ext3_get_block, wbc);
>
> err = ext3_journal_stop(handle);
> if (!ret)
> @@ -1922,17 +1919,6 @@ static int ext3_block_truncate_page(hand
> length = blocksize - (offset & (blocksize - 1));
> iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
>
> - /*
> - * For "nobh" option, we can only work if we don't need to
> - * read-in the page - otherwise we create buffers to do the IO.
> - */
> - if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
> - ext3_should_writeback_data(inode) && PageUptodate(page)) {
> - zero_user(page, offset, length);
> - set_page_dirty(page);
> - goto unlock;
> - }
> -
> if (!page_has_buffers(page))
> create_empty_buffers(page, blocksize, 0);
>
> Index: linux-2.6/fs/ext3/super.c
> ===================================================================
> --- linux-2.6.orig/fs/ext3/super.c 2010-06-07 09:56:07.529254714 +0200
> +++ linux-2.6/fs/ext3/super.c 2010-06-07 09:56:35.268023746 +0200
> @@ -661,9 +661,6 @@ static int ext3_show_options(struct seq_
> */
> seq_puts(seq, ",barrier=");
> seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
> - if (test_opt(sb, NOBH))
> - seq_puts(seq, ",nobh");
> -
> seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
> if (test_opt(sb, DATA_ERR_ABORT))
> seq_puts(seq, ",data_err=abort");
> @@ -1255,10 +1252,12 @@ set_qf_format:
> *n_blocks_count = option;
> break;
> case Opt_nobh:
> - set_opt(sbi->s_mount_opt, NOBH);
> + ext3_msg(sb, KERN_WARNING,
> + "warning: ignoring deprecated nobh option");
> break;
> case Opt_bh:
> - clear_opt(sbi->s_mount_opt, NOBH);
> + ext3_msg(sb, KERN_WARNING,
> + "warning: ignoring deprecated bh option");
> break;
> default:
> ext3_msg(sb, KERN_ERR,
> @@ -2001,14 +2000,6 @@ static int ext3_fill_super (struct super
> break;
> }
>
> - if (test_opt(sb, NOBH)) {
> - if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
> - ext3_msg(sb, KERN_WARNING,
> - "warning: ignoring nobh option - "
> - "it is supported only with writeback mode");
> - clear_opt(sbi->s_mount_opt, NOBH);
> - }
> - }
> /*
> * The journal_load will have done any necessary log recovery,
> * so we can safely mount the rest of the filesystem now.
> Index: linux-2.6/include/linux/ext3_fs.h
> ===================================================================
> --- linux-2.6.orig/include/linux/ext3_fs.h 2010-06-07 09:56:07.540254365 +0200
> +++ linux-2.6/include/linux/ext3_fs.h 2010-06-07 09:56:35.270022978 +0200
> @@ -400,7 +400,6 @@ struct ext3_inode {
> #define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
> #define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
> #define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
> -#define EXT3_MOUNT_NOBH 0x40000 /* No bufferheads */
> #define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
> #define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
> #define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
> --
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--
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
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