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Date: Thu, 12 Mar 2015 11:01:54 -0400
From: Andreas Dilger <adilger@...ger.ca>
To: Konstantin Khlebnikov <koct9i@...il.com>
Cc: Li Xi <pkuelelixi@...il.com>,
"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>,
Дмитрий Монахов
<dmonakhov@...nvz.org>
Subject: Re: [v9 3/5] ext4: adds project quota support
Ted, I was looking at ext2_fs.h in the upstream e2fsprogs and see that
all of the reserved inodes have already been used. The last reserved
inode was "EXT4_REPLICA_INO", so there is no space for the project
quota inode.
This patch is using inode #9 which conflicts with EXT2_EXCLUDE_INO,
while the patch from Konstantin is using inode #11 which is not reserved
and conflicts with lost+found on most filesystems.
What is the best road forward here? Should a new inode be allocated
and stored into the superblock?
Cheers, Andreas
> On Mar 11, 2015, at 03:40, Konstantin Khlebnikov <koct9i@...il.com> wrote:
>
>> On Wed, Mar 11, 2015 at 6:03 AM, 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 | 8 +++-
>> fs/ext4/super.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++-------
>> 2 files changed, 93 insertions(+), 14 deletions(-)
>>
>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
>> index 7acb2da..3443456 100644
>> --- a/fs/ext4/ext4.h
>> +++ b/fs/ext4/ext4.h
>> @@ -208,6 +208,7 @@ struct ext4_io_submit {
>> #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
>> #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
>> #define EXT4_JOURNAL_INO 8 /* Journal inode */
>> +#define EXT4_PRJ_QUOTA_INO 9 /* Project quota inode */
>
> This special inode is reserved for: EXT2_EXCLUDE_INO 9 /* The
> "exclude" inode, for snapshots */
> I'm not sure if it's ok to use it for project quota.
>
>>
>> /* First non-reserved inode for old ext4 filesystems */
>> #define EXT4_GOOD_OLD_FIRST_INO 11
>> @@ -987,6 +988,7 @@ struct ext4_inode_info {
>> #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
>> #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
>> #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
>> +#define EXT4_MOUNT_PRJQUOTA 0x2000000 /* Project quota support */
>> #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
>> #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
>> #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
>> @@ -1169,7 +1171,8 @@ 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 +1187,7 @@ 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 +1379,7 @@ 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 == EXT4_PRJ_QUOTA_INO ||
>> (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..e057daa 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);
>> @@ -1135,7 +1135,8 @@ enum {
>> Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
>> Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
>> Opt_data_err_abort, Opt_data_err_ignore,
>> - Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
>> + Opt_usrjquota, Opt_grpjquota, Opt_prjjquota,
>> + Opt_offusrjquota, Opt_offgrpjquota, Opt_offprjjquota,
>> Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
>> Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
>> Opt_usrquota, Opt_grpquota, Opt_i_version,
>> @@ -1190,6 +1191,8 @@ static const match_table_t tokens = {
>> {Opt_usrjquota, "usrjquota=%s"},
>> {Opt_offgrpjquota, "grpjquota="},
>> {Opt_grpjquota, "grpjquota=%s"},
>> + {Opt_prjjquota, "prjjquota"},
>> + {Opt_offprjjquota, "offprjjquota"},
>> {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
>> {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
>> {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
>> @@ -1412,11 +1415,14 @@ static const struct mount_opts {
>> {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
>> MOPT_SET | MOPT_Q},
>> {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
>> - EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
>> + EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
>> + MOPT_CLEAR | MOPT_Q},
>> {Opt_usrjquota, 0, MOPT_Q},
>> {Opt_grpjquota, 0, MOPT_Q},
>> + {Opt_prjjquota, 0, MOPT_Q},
>> {Opt_offusrjquota, 0, MOPT_Q},
>> {Opt_offgrpjquota, 0, MOPT_Q},
>> + {Opt_offprjjquota, 0, MOPT_Q},
>> {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
>> {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
>> {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
>> @@ -1433,16 +1439,25 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
>> kuid_t uid;
>> kgid_t gid;
>> int arg = 0;
>> -
>> #ifdef CONFIG_QUOTA
>> + char *prj_qf_name = "aquota.project";
>
> If you already have inode numer in super-block why do you need this name here?
> Modern journalled quota is stored in special inodes and invisible from
> user-space.
>
>> + substring_t prj_qf_string = {
>> + .from = prj_qf_name,
>> + .to = &prj_qf_name[strlen(prj_qf_name)],
>> + };
>> +
>> if (token == Opt_usrjquota)
>> return set_qf_name(sb, USRQUOTA, &args[0]);
>> else if (token == Opt_grpjquota)
>> return set_qf_name(sb, GRPQUOTA, &args[0]);
>> + else if (token == Opt_prjjquota)
>> + return set_qf_name(sb, PRJQUOTA, &prj_qf_string);
>> else if (token == Opt_offusrjquota)
>> return clear_qf_name(sb, USRQUOTA);
>> else if (token == Opt_offgrpjquota)
>> return clear_qf_name(sb, GRPQUOTA);
>> + else if (token == Opt_offprjjquota)
>> + return clear_qf_name(sb, PRJQUOTA);
>> #endif
>> switch (token) {
>> case Opt_noacl:
>> @@ -1668,19 +1683,28 @@ static int parse_options(char *options, struct super_block *sb,
>> }
>> #ifdef CONFIG_QUOTA
>> if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
>> - (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
>> + (test_opt(sb, USRQUOTA) ||
>> + test_opt(sb, GRPQUOTA) ||
>> + test_opt(sb, PRJQUOTA))) {
>> ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
>> "feature is enabled");
>> return 0;
>> }
>> - if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
>> + if (sbi->s_qf_names[USRQUOTA] ||
>> + sbi->s_qf_names[GRPQUOTA] ||
>> + sbi->s_qf_names[PRJQUOTA]) {
>> if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
>> clear_opt(sb, USRQUOTA);
>>
>> if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
>> clear_opt(sb, GRPQUOTA);
>>
>> - if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
>> + if (test_opt(sb, PRJQUOTA) && sbi->s_qf_names[PRJQUOTA])
>> + clear_opt(sb, PRJQUOTA);
>> +
>> + if (test_opt(sb, GRPQUOTA) ||
>> + test_opt(sb, USRQUOTA) ||
>> + test_opt(sb, PRJQUOTA)) {
>> ext4_msg(sb, KERN_ERR, "old and new quota "
>> "format mixing");
>> return 0;
>> @@ -1740,6 +1764,9 @@ static inline void ext4_show_quota_options(struct seq_file *seq,
>>
>> if (sbi->s_qf_names[GRPQUOTA])
>> seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
>> +
>> + if (sbi->s_qf_names[PRJQUOTA])
>> + seq_printf(seq, ",prjjquota=%s", sbi->s_qf_names[PRJQUOTA]);
>> #endif
>> }
>>
>> @@ -3944,7 +3971,7 @@ 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 +5067,46 @@ 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 +5115,7 @@ 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 +5140,9 @@ 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;
>> }
>>
>> @@ -5152,7 +5223,9 @@ static int ext4_mark_dquot_dirty(struct dquot *dquot)
>>
>> /* Are we journaling quotas? */
>> if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
>> - sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
>> + sbi->s_qf_names[USRQUOTA] ||
>> + sbi->s_qf_names[GRPQUOTA] ||
>> + sbi->s_qf_names[PRJQUOTA]) {
>> dquot_mark_dquot_dirty(dquot);
>> return ext4_write_dquot(dquot);
>> } else {
>> @@ -5236,7 +5309,8 @@ 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 +5338,8 @@ 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
>>
>> --
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