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Message-Id: <000EC725-2B59-42E8-811E-0E41E6EBB306@dilger.ca>
Date: Mon, 20 Apr 2015 17:27:20 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Li Xi <pkuelelixi@...il.com>
Cc: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-api@...r.kernel.org, tytso@....edu, jack@...e.cz,
viro@...iv.linux.org.uk, hch@...radead.org, dmonakhov@...nvz.org
Subject: Re: [v13 3/5] ext4: adds project quota support
On Apr 19, 2015, at 7:39 PM, Li Xi <pkuelelixi@...il.com> wrote:
>
> This patch adds mount options for enabling/disabling project quota
> accounting and enforcement. A new specific inode is also used for
> project quota accounting.
>
> Signed-off-by: Li Xi <lixi@....com>
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> Reviewed-by: Jan Kara <jack@...e.cz>
> ---
> fs/ext4/ext4.h | 6 +++-
> fs/ext4/super.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++----
> 2 files changed, 55 insertions(+), 7 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 1446c4f..a7acf10 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1169,7 +1169,8 @@ struct ext4_super_block {
> __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
> __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
> __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
> - __le32 s_reserved[105]; /* Padding to the end of the block */
> + __le32 s_prj_quota_inum; /* inode for tracking project quota */
> + __le32 s_reserved[104]; /* Padding to the end of the block */
> __le32 s_checksum; /* crc32c(superblock) */
> };
>
> @@ -1184,7 +1185,7 @@ struct ext4_super_block {
> #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
>
> /* Number of quota types we support */
> -#define EXT4_MAXQUOTAS 2
> +#define EXT4_MAXQUOTAS 3
>
> /*
> * fourth extended-fs super-block data in memory
> @@ -1376,6 +1377,7 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
> ino == EXT4_BOOT_LOADER_INO ||
> ino == EXT4_JOURNAL_INO ||
> ino == EXT4_RESIZE_INO ||
> + ino == le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum) ||
This extra check isn't needed, since s_proj_quota_inum will be a regular
inode number and handled by the checks below.
Cheers, Andreas.
> (ino >= EXT4_FIRST_INO(sb) &&
> ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
> }
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 04c6cc3..476e46f 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1036,8 +1036,8 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
> }
>
> #ifdef CONFIG_QUOTA
> -#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
> -#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
> +static char *quotatypes[] = INITQFNAMES;
> +#define QTYPE2NAME(t) (quotatypes[t])
>
> static int ext4_write_dquot(struct dquot *dquot);
> static int ext4_acquire_dquot(struct dquot *dquot);
> @@ -3944,7 +3944,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> sb->s_qcop = &ext4_qctl_sysfile_operations;
> else
> sb->s_qcop = &ext4_qctl_operations;
> - sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
> + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
> #endif
> memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
>
> @@ -5040,6 +5040,46 @@ restore_opts:
> return err;
> }
>
> +static int ext4_statfs_project(struct super_block *sb,
> + kprojid_t projid, struct kstatfs *buf)
> +{
> + struct kqid qid;
> + struct dquot *dquot;
> + u64 limit;
> + u64 curblock;
> +
> + qid = make_kqid_projid(projid);
> + dquot = dqget(sb, qid);
> + if (!dquot)
> + return -ESRCH;
> + spin_lock(&dq_data_lock);
> +
> + limit = dquot->dq_dqb.dqb_bsoftlimit ?
> + dquot->dq_dqb.dqb_bsoftlimit :
> + dquot->dq_dqb.dqb_bhardlimit;
> + if (limit && buf->f_blocks * buf->f_bsize > limit) {
> + curblock = dquot->dq_dqb.dqb_curspace / buf->f_bsize;
> + buf->f_blocks = limit / buf->f_bsize;
> + buf->f_bfree = buf->f_bavail =
> + (buf->f_blocks > curblock) ?
> + (buf->f_blocks - curblock) : 0;
> + }
> +
> + limit = dquot->dq_dqb.dqb_isoftlimit ?
> + dquot->dq_dqb.dqb_isoftlimit :
> + dquot->dq_dqb.dqb_ihardlimit;
> + if (limit && buf->f_files > limit) {
> + buf->f_files = limit;
> + buf->f_ffree =
> + (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
> + (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
> + }
> +
> + spin_unlock(&dq_data_lock);
> + dqput(dquot);
> + return 0;
> +}
> +
> static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
> {
> struct super_block *sb = dentry->d_sb;
> @@ -5048,6 +5088,7 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
> ext4_fsblk_t overhead = 0, resv_blocks;
> u64 fsid;
> s64 bfree;
> + struct inode *inode = dentry->d_inode;
> resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
>
> if (!test_opt(sb, MINIX_DF))
> @@ -5072,6 +5113,9 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
> buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
> buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
>
> + if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT) &&
> + sb_has_quota_limits_enabled(sb, PRJQUOTA))
> + ext4_statfs_project(sb, EXT4_I(inode)->i_projid, buf);
> return 0;
> }
>
> @@ -5236,7 +5280,8 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
> struct inode *qf_inode;
> unsigned long qf_inums[EXT4_MAXQUOTAS] = {
> le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
> - le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
> + le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
> + le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
> };
>
> BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
> @@ -5264,7 +5309,8 @@ static int ext4_enable_quotas(struct super_block *sb)
> int type, err = 0;
> unsigned long qf_inums[EXT4_MAXQUOTAS] = {
> le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
> - le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
> + le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
> + le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
> };
>
> sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
> --
> 1.7.1
>
Cheers, Andreas
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