linux-ext4 - Re: [PATCH e2fsprogs] e2fsck: update quota accounting after directory optimization

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Date: Wed, 27 Mar 2024 13:25:49 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: "Luis Henriques (SUSE)" <luis.henriques@...ux.dev>
Cc: Theodore Ts'o <tytso@....edu>,
 Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH e2fsprogs] e2fsck: update quota accounting after directory
 optimization

On Mar 27, 2024, at 9:43 AM, Luis Henriques (SUSE) <luis.henriques@...ux.dev> wrote:
> 
> In "Pass 3A: Optimizing directories", a directory may have it's size reduced.
> If that happens and quota is enabled in the filesystem, the quota information
> will be incorrect because it doesn't take the rehash into account.
> 
> This patch simply updates the quota data accordingly, after the directory is
> written and it's size has been updated.

Hi Luis,
thanks for the patch.  It looks reasonable, and might (partially) explain
why quota accounting occasionally reports inconsistencies by a few blocks
after running e2fsck.  You can add my Reviewed-by: to the patch.


Could you please include an e2fsck regression test for this, to confirm
that it is working and continues to work in the future?  It should be
possible to use something like the following to create a test case:

    # cd tests
    # make testnew
    # tune2fs -O quota,project f_testnew/image
    # mkdir /mnt/tmp
    # mount -t ext4 -o loop f_testnew/image /mnt/tmp
    # mkdir /mnt/tmp/subdir
    # chattr -p 1000 -P /mnt/tmp/subdir
    # touch /mnt/tmp/subdir/long-filenames-for-test-{1..1024}
    # rm /mnt/tmp/subdir/long-filenames-for-test-{1..1024..2}
    # umount /mnt/tmp
    # echo "directory optimization updates quota" > f_testnew/name
    # make testend
    # mv f_testnew f_quota_shrinkdir

and confirm in expect.[12] that the quota did not need to be repaired
afterward by e2fsck (i.e. there shouldn't be any error messages about
inconsistent quota).  Running this test with an unpatched e2fsck should
report that the quotas had to be fixed and the test should fail.


On a related note, it would be convenient if "make testnew" passed an
environment variable (e.g. $TESTNEW_OPTS) to mke2fs so more options
could be set at format time instead of using tune2fs afterward:

    # TESTNEW_OPTS="-O quota,project" make testnew

It isn't a big deal in this case, but might be useful in the future.

Cheers, Andreas

> Link: https://bugzilla.kernel.org/show_bug.cgi?id=218626
> Signed-off-by: Luis Henriques (SUSE) <luis.henriques@...ux.dev>
> ---
> e2fsck/rehash.c | 27 +++++++++++++++++++++------
> 1 file changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/e2fsck/rehash.c b/e2fsck/rehash.c
> index c1da7d52724e..4847d172e5fe 100644
> --- a/e2fsck/rehash.c
> +++ b/e2fsck/rehash.c
> @@ -987,14 +987,18 @@ errcode_t e2fsck_rehash_dir(e2fsck_t ctx, ext2_ino_t ino,
> {
> 	ext2_filsys 		fs = ctx->fs;
> 	errcode_t		retval;
> -	struct ext2_inode 	inode;
> +	struct ext2_inode_large	inode;
> 	char			*dir_buf = 0;
> 	struct fill_dir_struct	fd = { NULL, NULL, 0, 0, 0, NULL,
> 				       0, 0, 0, 0, 0, 0 };
> 	struct out_dir		outdir = { 0, 0, 0, 0 };
> -	struct name_cmp_ctx name_cmp_ctx = {0, NULL};
> +	struct name_cmp_ctx	name_cmp_ctx = {0, NULL};
> +	__u64			osize;
> 
> -	e2fsck_read_inode(ctx, ino, &inode, "rehash_dir");
> +	e2fsck_read_inode_full(ctx, ino, EXT2_INODE(&inode),
> +			       sizeof(inode), "rehash_dir");
> +
> +	osize = EXT2_I_SIZE(&inode);
> 
> 	if (ext2fs_has_feature_inline_data(fs->super) &&
> 	   (inode.i_flags & EXT4_INLINE_DATA_FL))
> @@ -1013,7 +1017,7 @@ errcode_t e2fsck_rehash_dir(e2fsck_t ctx, ext2_ino_t ino,
> 	fd.ino = ino;
> 	fd.ctx = ctx;
> 	fd.buf = dir_buf;
> -	fd.inode = &inode;
> +	fd.inode = EXT2_INODE(&inode);
> 	fd.dir = ino;
> 	if (!ext2fs_has_feature_dir_index(fs->super) ||
> 	    (inode.i_size / fs->blocksize) < 2)
> @@ -1092,14 +1096,25 @@ resort:
> 			goto errout;
> 	}
> 
> -	retval = write_directory(ctx, fs, &outdir, ino, &inode, fd.compress);
> +	retval = write_directory(ctx, fs, &outdir, ino, EXT2_INODE(&inode),
> +				 fd.compress);
> 	if (retval)
> 		goto errout;
> 
> +	if ((osize > EXT2_I_SIZE(&inode)) &&
> +	    (ino != quota_type2inum(PRJQUOTA, fs->super)) &&
> +	    (ino != fs->super->s_orphan_file_inum) &&
> +	    (ino == EXT2_ROOT_INO || ino >= EXT2_FIRST_INODE(ctx->fs->super)) &&
> +	    !(inode.i_flags & EXT4_EA_INODE_FL)) {
> +		quota_data_sub(ctx->qctx, &inode,
> +			       ino, osize - EXT2_I_SIZE(&inode));
> +	}
> +
> 	if (ctx->options & E2F_OPT_CONVERT_BMAP)
> 		retval = e2fsck_rebuild_extents_later(ctx, ino);
> 	else
> -		retval = e2fsck_check_rebuild_extents(ctx, ino, &inode, pctx);
> +		retval = e2fsck_check_rebuild_extents(ctx, ino,
> +						      EXT2_INODE(&inode), pctx);
> errout:
> 	ext2fs_free_mem(&dir_buf);
> 	ext2fs_free_mem(&fd.harray);
> 


Cheers, Andreas






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