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Date: Thu, 9 Jun 2022 19:32:03 +0200
From: Jan Kara <jack@...e.cz>
To: Christoph Hellwig <hch@....de>
Cc: Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.com>,
Dave Kleikamp <shaggy@...nel.org>, linux-ext4@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
jfs-discussion@...ts.sourceforge.net
Subject: Re: [PATCH 1/5] ext2: remove nobh support
On Wed 08-06-22 17:04:47, Christoph Hellwig wrote:
> The nobh mode is an obscure feature to save lowlevel for large memory
> 32-bit configurations while trading for much slower performance and
> has been long obsolete. Remove it.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
Yes, I agree. Let's just rip it out. Feel free to add:
Acked-by: Jan Kara <jack@...e.cz>
Honza
> ---
> Documentation/filesystems/ext2.rst | 2 --
> fs/ext2/ext2.h | 1 -
> fs/ext2/inode.c | 51 ++----------------------------
> fs/ext2/namei.c | 10 ++----
> fs/ext2/super.c | 6 ++--
> 5 files changed, 7 insertions(+), 63 deletions(-)
>
> diff --git a/Documentation/filesystems/ext2.rst b/Documentation/filesystems/ext2.rst
> index 154101cf0e4f5..92aae683e16a7 100644
> --- a/Documentation/filesystems/ext2.rst
> +++ b/Documentation/filesystems/ext2.rst
> @@ -59,8 +59,6 @@ acl Enable POSIX Access Control Lists support
> (requires CONFIG_EXT2_FS_POSIX_ACL).
> noacl Don't support POSIX ACLs.
>
> -nobh Do not attach buffer_heads to file pagecache.
> -
> quota, usrquota Enable user disk quota support
> (requires CONFIG_QUOTA).
>
> diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
> index d4f306aa5aceb..28de11a22e5f6 100644
> --- a/fs/ext2/ext2.h
> +++ b/fs/ext2/ext2.h
> @@ -795,7 +795,6 @@ extern const struct file_operations ext2_file_operations;
> /* inode.c */
> extern void ext2_set_file_ops(struct inode *inode);
> extern const struct address_space_operations ext2_aops;
> -extern const struct address_space_operations ext2_nobh_aops;
> extern const struct iomap_ops ext2_iomap_ops;
>
> /* namei.c */
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 84570c6265aae..2001e784fee11 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -908,25 +908,6 @@ static int ext2_write_end(struct file *file, struct address_space *mapping,
> return ret;
> }
>
> -static int
> -ext2_nobh_write_begin(struct file *file, struct address_space *mapping,
> - loff_t pos, unsigned len, struct page **pagep, void **fsdata)
> -{
> - int ret;
> -
> - ret = nobh_write_begin(mapping, pos, len, pagep, fsdata,
> - ext2_get_block);
> - if (ret < 0)
> - ext2_write_failed(mapping, pos + len);
> - return ret;
> -}
> -
> -static int ext2_nobh_writepage(struct page *page,
> - struct writeback_control *wbc)
> -{
> - return nobh_writepage(page, ext2_get_block, wbc);
> -}
> -
> static sector_t ext2_bmap(struct address_space *mapping, sector_t block)
> {
> return generic_block_bmap(mapping,block,ext2_get_block);
> @@ -978,21 +959,6 @@ const struct address_space_operations ext2_aops = {
> .error_remove_page = generic_error_remove_page,
> };
>
> -const struct address_space_operations ext2_nobh_aops = {
> - .dirty_folio = block_dirty_folio,
> - .invalidate_folio = block_invalidate_folio,
> - .read_folio = ext2_read_folio,
> - .readahead = ext2_readahead,
> - .writepage = ext2_nobh_writepage,
> - .write_begin = ext2_nobh_write_begin,
> - .write_end = nobh_write_end,
> - .bmap = ext2_bmap,
> - .direct_IO = ext2_direct_IO,
> - .writepages = ext2_writepages,
> - .migrate_folio = buffer_migrate_folio,
> - .error_remove_page = generic_error_remove_page,
> -};
> -
> static const struct address_space_operations ext2_dax_aops = {
> .writepages = ext2_dax_writepages,
> .direct_IO = noop_direct_IO,
> @@ -1298,13 +1264,10 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
>
> inode_dio_wait(inode);
>
> - if (IS_DAX(inode)) {
> + if (IS_DAX(inode))
> error = dax_zero_range(inode, newsize,
> PAGE_ALIGN(newsize) - newsize, NULL,
> &ext2_iomap_ops);
> - } else if (test_opt(inode->i_sb, NOBH))
> - error = nobh_truncate_page(inode->i_mapping,
> - newsize, ext2_get_block);
> else
> error = block_truncate_page(inode->i_mapping,
> newsize, ext2_get_block);
> @@ -1396,8 +1359,6 @@ void ext2_set_file_ops(struct inode *inode)
> inode->i_fop = &ext2_file_operations;
> if (IS_DAX(inode))
> inode->i_mapping->a_ops = &ext2_dax_aops;
> - else if (test_opt(inode->i_sb, NOBH))
> - inode->i_mapping->a_ops = &ext2_nobh_aops;
> else
> inode->i_mapping->a_ops = &ext2_aops;
> }
> @@ -1497,10 +1458,7 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
> } else if (S_ISDIR(inode->i_mode)) {
> inode->i_op = &ext2_dir_inode_operations;
> inode->i_fop = &ext2_dir_operations;
> - if (test_opt(inode->i_sb, NOBH))
> - inode->i_mapping->a_ops = &ext2_nobh_aops;
> - else
> - inode->i_mapping->a_ops = &ext2_aops;
> + inode->i_mapping->a_ops = &ext2_aops;
> } else if (S_ISLNK(inode->i_mode)) {
> if (ext2_inode_is_fast_symlink(inode)) {
> inode->i_link = (char *)ei->i_data;
> @@ -1510,10 +1468,7 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
> } else {
> inode->i_op = &ext2_symlink_inode_operations;
> inode_nohighmem(inode);
> - if (test_opt(inode->i_sb, NOBH))
> - inode->i_mapping->a_ops = &ext2_nobh_aops;
> - else
> - inode->i_mapping->a_ops = &ext2_aops;
> + inode->i_mapping->a_ops = &ext2_aops;
> }
> } else {
> inode->i_op = &ext2_special_inode_operations;
> diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
> index 5f6b7560eb3f3..5fd9a22d2b70c 100644
> --- a/fs/ext2/namei.c
> +++ b/fs/ext2/namei.c
> @@ -178,10 +178,7 @@ static int ext2_symlink (struct user_namespace * mnt_userns, struct inode * dir,
> /* slow symlink */
> inode->i_op = &ext2_symlink_inode_operations;
> inode_nohighmem(inode);
> - if (test_opt(inode->i_sb, NOBH))
> - inode->i_mapping->a_ops = &ext2_nobh_aops;
> - else
> - inode->i_mapping->a_ops = &ext2_aops;
> + inode->i_mapping->a_ops = &ext2_aops;
> err = page_symlink(inode, symname, l);
> if (err)
> goto out_fail;
> @@ -247,10 +244,7 @@ static int ext2_mkdir(struct user_namespace * mnt_userns,
>
> inode->i_op = &ext2_dir_inode_operations;
> inode->i_fop = &ext2_dir_operations;
> - if (test_opt(inode->i_sb, NOBH))
> - inode->i_mapping->a_ops = &ext2_nobh_aops;
> - else
> - inode->i_mapping->a_ops = &ext2_aops;
> + inode->i_mapping->a_ops = &ext2_aops;
>
> inode_inc_link_count(inode);
>
> diff --git a/fs/ext2/super.c b/fs/ext2/super.c
> index f6a19f6d9f6d5..a1c1263c07ab3 100644
> --- a/fs/ext2/super.c
> +++ b/fs/ext2/super.c
> @@ -296,9 +296,6 @@ static int ext2_show_options(struct seq_file *seq, struct dentry *root)
> seq_puts(seq, ",noacl");
> #endif
>
> - if (test_opt(sb, NOBH))
> - seq_puts(seq, ",nobh");
> -
> if (test_opt(sb, USRQUOTA))
> seq_puts(seq, ",usrquota");
>
> @@ -551,7 +548,8 @@ static int parse_options(char *options, struct super_block *sb,
> clear_opt (opts->s_mount_opt, OLDALLOC);
> break;
> case Opt_nobh:
> - set_opt (opts->s_mount_opt, NOBH);
> + ext2_msg(sb, KERN_INFO,
> + "nobh option not supported");
> break;
> #ifdef CONFIG_EXT2_FS_XATTR
> case Opt_user_xattr:
> --
> 2.30.2
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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