From: Andreas Dilger <adilger@dilger.ca>
To: Jan Kara <jack@suse.cz>
Cc: Ted Tso <tytso@mit.edu>, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 3/7] ext2fs: Update allocation info earlier in ext2fs_mkdir() and ext2fs_symlink()
Date: Fri, 14 Feb 2020 12:37:06 -0700 [thread overview]
Message-ID: <9D561ECB-5D6E-4979-9CCB-26B56898A286@dilger.ca> (raw)
In-Reply-To: <20200213101602.29096-4-jack@suse.cz>
[-- Attachment #1: Type: text/plain, Size: 2987 bytes --]
On Feb 13, 2020, at 3:15 AM, Jan Kara <jack@suse.cz> wrote:
>
> Currently, ext2fs_mkdir() and ext2fs_symlink() update allocation bitmaps
> and other information only close to the end of the function, in
> particular after calling to ext2fs_link(). When ext2fs_link() will
> support indexed directories, it will also need to allocate blocks and
> that would cause filesystem corruption in case allocation info isn't
> properly updated. So make sure ext2fs_mkdir() and ext2fs_symlink()
> update allocation info before calling into ext2fs_link().
>
> Signed-off-by: Jan Kara <jack@suse.cz>
I was wondering if this was done at the end of the function to avoid the
need to undo it if there was an error in the middle of the operation?
I suppose the worst that would happen in that case is an extra bit set
in the block bitmap until the next e2fsck, which is a relatively safe
side-effect... I'm not sure whether e2fsck would abort anyway in the
case either of these functions return an error?
In any case, this is better than what is there currently.
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
> ---
> lib/ext2fs/mkdir.c | 14 +++++++-------
> lib/ext2fs/symlink.c | 14 +++++++-------
> 2 files changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/lib/ext2fs/mkdir.c b/lib/ext2fs/mkdir.c
> index 2a63aad16715..947003ebf309 100644
> --- a/lib/ext2fs/mkdir.c
> +++ b/lib/ext2fs/mkdir.c
> @@ -143,6 +143,13 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
> }
> }
>
> + /*
> + * Update accounting....
> + */
> + if (!inline_data)
> + ext2fs_block_alloc_stats2(fs, blk, +1);
> + ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
> +
> /*
> * Link the directory into the filesystem hierarchy
> */
> @@ -175,13 +182,6 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
> goto cleanup;
> }
>
> - /*
> - * Update accounting....
> - */
> - if (!inline_data)
> - ext2fs_block_alloc_stats2(fs, blk, +1);
> - ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
> -
> cleanup:
> if (block)
> ext2fs_free_mem(&block);
> diff --git a/lib/ext2fs/symlink.c b/lib/ext2fs/symlink.c
> index 7f78c5f75549..3e07a539daf3 100644
> --- a/lib/ext2fs/symlink.c
> +++ b/lib/ext2fs/symlink.c
> @@ -162,6 +162,13 @@ need_block:
> goto cleanup;
> }
>
> + /*
> + * Update accounting....
> + */
> + if (!fastlink && !inlinelink)
> + ext2fs_block_alloc_stats2(fs, blk, +1);
> + ext2fs_inode_alloc_stats2(fs, ino, +1, 0);
> +
> /*
> * Link the symlink into the filesystem hierarchy
> */
> @@ -179,13 +186,6 @@ need_block:
> goto cleanup;
> }
>
> - /*
> - * Update accounting....
> - */
> - if (!fastlink && !inlinelink)
> - ext2fs_block_alloc_stats2(fs, blk, +1);
> - ext2fs_inode_alloc_stats2(fs, ino, +1, 0);
> -
> cleanup:
> if (block_buf)
> ext2fs_free_mem(&block_buf);
> --
> 2.16.4
>
Cheers, Andreas
[-- Attachment #2: Message signed with OpenPGP --]
[-- Type: application/pgp-signature, Size: 873 bytes --]
next prev parent reply other threads:[~2020-02-14 19:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 10:15 [PATCH 0/7 v2] e2fsprogs: Better handling of indexed directories Jan Kara
2020-02-13 10:15 ` [PATCH 1/7] e2fsck: Clarify overflow link count error message Jan Kara
2020-02-14 19:27 ` Andreas Dilger
2020-03-07 18:52 ` Theodore Y. Ts'o
2020-02-13 10:15 ` [PATCH 2/7] e2fsck: Fix indexed dir rehash failure with metadata_csum enabled Jan Kara
2020-02-14 19:28 ` Andreas Dilger
2020-03-07 23:17 ` Theodore Y. Ts'o
2020-03-16 9:30 ` Jan Kara
2020-02-13 10:15 ` [PATCH 3/7] ext2fs: Update allocation info earlier in ext2fs_mkdir() and ext2fs_symlink() Jan Kara
2020-02-14 19:37 ` Andreas Dilger [this message]
2020-03-08 0:02 ` Theodore Y. Ts'o
2020-03-08 2:20 ` Theodore Y. Ts'o
2020-03-15 16:15 ` Theodore Y. Ts'o
2020-03-16 9:32 ` Jan Kara
2020-02-13 10:15 ` [PATCH 4/7] ext2fs: Implement dir entry creation in htree directories Jan Kara
2020-03-15 16:43 ` Theodore Y. Ts'o
2020-02-13 10:16 ` [PATCH 5/7] tests: Modify f_large_dir test to excercise indexed dir handling Jan Kara
2020-02-18 20:29 ` Andreas Dilger
2020-03-15 16:43 ` Theodore Y. Ts'o
2020-02-13 10:16 ` [PATCH 6/7] tests: Add test to excercise indexed directories with metadata_csum Jan Kara
2020-02-18 20:34 ` Andreas Dilger
2020-02-13 10:16 ` [PATCH 7/7] tune2fs: Update dir checksums when clearing dir_index feature Jan Kara
2020-02-18 20:50 ` Andreas Dilger
2020-02-19 10:23 ` Jan Kara
2020-03-15 17:15 ` Theodore Y. Ts'o
2020-03-16 0:11 ` Andreas Dilger
2020-03-16 9:27 ` Jan Kara
2020-03-26 14:27 ` Jan Kara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9D561ECB-5D6E-4979-9CCB-26B56898A286@dilger.ca \
--to=adilger@dilger.ca \
--cc=jack@suse.cz \
--cc=linux-ext4@vger.kernel.org \
--cc=tytso@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).