This is a note to let you know that I've just added the patch titled f2fs: choose hardlimit when softlimit is larger than hardlimit in f2fs_statfs_project() to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: f2fs-choose-hardlimit-when-softlimit-is-larger-than-.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 4a2869ce8e18dbe8954fa070a2a66e9f1871fc2f Author: Chengguang Xu <cgxu519@xxxxxxxxxxxx> Date: Mon Nov 25 11:20:36 2019 +0800 f2fs: choose hardlimit when softlimit is larger than hardlimit in f2fs_statfs_project() [ Upstream commit 909110c060f22e65756659ec6fa957ae75777e00 ] Setting softlimit larger than hardlimit seems meaningless for disk quota but currently it is allowed. In this case, there may be a bit of comfusion for users when they run df comamnd to directory which has project quota. For example, we set 20M softlimit and 10M hardlimit of block usage limit for project quota of test_dir(project id 123). [root@hades f2fs]# repquota -P -a *** Report for project quotas on device /dev/nvme0n1p8 Block grace time: 7days; Inode grace time: 7days Block limits File limits Project used soft hard grace used soft hard grace ---------------------------------------------------------------------- 0 -- 4 0 0 1 0 0 123 +- 10248 20480 10240 2 0 0 The result of df command as below: [root@hades f2fs]# df -h /mnt/f2fs/test Filesystem Size Used Avail Use% Mounted on /dev/nvme0n1p8 20M 11M 10M 51% /mnt/f2fs Even though it looks like there is another 10M free space to use, if we write new data to diretory test(inherit project id), the write will fail with errno(-EDQUOT). After this patch, the df result looks like below. [root@hades f2fs]# df -h /mnt/f2fs/test Filesystem Size Used Avail Use% Mounted on /dev/nvme0n1p8 10M 10M 0 100% /mnt/f2fs Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx> Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 1443cee15863..a2af155567b8 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1213,9 +1213,13 @@ static int f2fs_statfs_project(struct super_block *sb, return PTR_ERR(dquot); spin_lock(&dquot->dq_dqb_lock); - limit = (dquot->dq_dqb.dqb_bsoftlimit ? - dquot->dq_dqb.dqb_bsoftlimit : - dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits; + limit = 0; + if (dquot->dq_dqb.dqb_bsoftlimit) + limit = dquot->dq_dqb.dqb_bsoftlimit; + if (dquot->dq_dqb.dqb_bhardlimit && + (!limit || dquot->dq_dqb.dqb_bhardlimit < limit)) + limit = dquot->dq_dqb.dqb_bhardlimit; + if (limit && buf->f_blocks > limit) { curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits; buf->f_blocks = limit; @@ -1224,9 +1228,13 @@ static int f2fs_statfs_project(struct super_block *sb, (buf->f_blocks - curblock) : 0; } - limit = dquot->dq_dqb.dqb_isoftlimit ? - dquot->dq_dqb.dqb_isoftlimit : - dquot->dq_dqb.dqb_ihardlimit; + limit = 0; + if (dquot->dq_dqb.dqb_isoftlimit) + limit = dquot->dq_dqb.dqb_isoftlimit; + if (dquot->dq_dqb.dqb_ihardlimit && + (!limit || dquot->dq_dqb.dqb_ihardlimit < limit)) + limit = dquot->dq_dqb.dqb_ihardlimit; + if (limit && buf->f_files > limit) { buf->f_files = limit; buf->f_ffree =