quota: Switch ->get_dqblk() and ->set_dqblk() to use bytes as space units
Currently ->get_dqblk() and ->set_dqblk() use struct fs_disk_quota which
tracks space limits and usage in 512-byte blocks. However VFS quotas
track usage in bytes (as some filesystems require that) and we need to
somehow pass this information. Upto now it wasn't a problem because we
didn't do any unit conversion (thus VFS quota routines happily stuck
number of bytes into d_bcount field of struct fd_disk_quota). Only if
you tried to use Q_XGETQUOTA or Q_XSETQLIM for VFS quotas (or Q_GETQUOTA
/ Q_SETQUOTA for XFS quotas), you got bogus results. Hardly anyone
tried this but reportedly some Samba users hit the problem in practice.
So when we want interfaces compatible we need to fix this.
We bite the bullet and define another quota structure used for passing
information from/to ->get_dqblk()/->set_dqblk. It's somewhat sad we have
to have more conversion routines in fs/quota/quota.c and another copying
of quota structure slows down getting of quota information by about 2%
but it seems cleaner than overloading e.g. units of d_bcount to bytes.
CC: stable@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 2aa4151..6f38563 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -118,17 +118,27 @@
return sb->s_qcop->set_info(sb, type, &info);
}
-static void copy_to_if_dqblk(struct if_dqblk *dst, struct fs_disk_quota *src)
+static inline qsize_t qbtos(qsize_t blocks)
+{
+ return blocks << QIF_DQBLKSIZE_BITS;
+}
+
+static inline qsize_t stoqb(qsize_t space)
+{
+ return (space + QIF_DQBLKSIZE - 1) >> QIF_DQBLKSIZE_BITS;
+}
+
+static void copy_to_if_dqblk(struct if_dqblk *dst, struct qc_dqblk *src)
{
memset(dst, 0, sizeof(*dst));
- dst->dqb_bhardlimit = src->d_blk_hardlimit;
- dst->dqb_bsoftlimit = src->d_blk_softlimit;
- dst->dqb_curspace = src->d_bcount;
+ dst->dqb_bhardlimit = stoqb(src->d_spc_hardlimit);
+ dst->dqb_bsoftlimit = stoqb(src->d_spc_softlimit);
+ dst->dqb_curspace = src->d_space;
dst->dqb_ihardlimit = src->d_ino_hardlimit;
dst->dqb_isoftlimit = src->d_ino_softlimit;
- dst->dqb_curinodes = src->d_icount;
- dst->dqb_btime = src->d_btimer;
- dst->dqb_itime = src->d_itimer;
+ dst->dqb_curinodes = src->d_ino_count;
+ dst->dqb_btime = src->d_spc_timer;
+ dst->dqb_itime = src->d_ino_timer;
dst->dqb_valid = QIF_ALL;
}
@@ -136,7 +146,7 @@
void __user *addr)
{
struct kqid qid;
- struct fs_disk_quota fdq;
+ struct qc_dqblk fdq;
struct if_dqblk idq;
int ret;
@@ -154,36 +164,36 @@
return 0;
}
-static void copy_from_if_dqblk(struct fs_disk_quota *dst, struct if_dqblk *src)
+static void copy_from_if_dqblk(struct qc_dqblk *dst, struct if_dqblk *src)
{
- dst->d_blk_hardlimit = src->dqb_bhardlimit;
- dst->d_blk_softlimit = src->dqb_bsoftlimit;
- dst->d_bcount = src->dqb_curspace;
+ dst->d_spc_hardlimit = qbtos(src->dqb_bhardlimit);
+ dst->d_spc_softlimit = qbtos(src->dqb_bsoftlimit);
+ dst->d_space = src->dqb_curspace;
dst->d_ino_hardlimit = src->dqb_ihardlimit;
dst->d_ino_softlimit = src->dqb_isoftlimit;
- dst->d_icount = src->dqb_curinodes;
- dst->d_btimer = src->dqb_btime;
- dst->d_itimer = src->dqb_itime;
+ dst->d_ino_count = src->dqb_curinodes;
+ dst->d_spc_timer = src->dqb_btime;
+ dst->d_ino_timer = src->dqb_itime;
dst->d_fieldmask = 0;
if (src->dqb_valid & QIF_BLIMITS)
- dst->d_fieldmask |= FS_DQ_BSOFT | FS_DQ_BHARD;
+ dst->d_fieldmask |= QC_SPC_SOFT | QC_SPC_HARD;
if (src->dqb_valid & QIF_SPACE)
- dst->d_fieldmask |= FS_DQ_BCOUNT;
+ dst->d_fieldmask |= QC_SPACE;
if (src->dqb_valid & QIF_ILIMITS)
- dst->d_fieldmask |= FS_DQ_ISOFT | FS_DQ_IHARD;
+ dst->d_fieldmask |= QC_INO_SOFT | QC_INO_HARD;
if (src->dqb_valid & QIF_INODES)
- dst->d_fieldmask |= FS_DQ_ICOUNT;
+ dst->d_fieldmask |= QC_INO_COUNT;
if (src->dqb_valid & QIF_BTIME)
- dst->d_fieldmask |= FS_DQ_BTIMER;
+ dst->d_fieldmask |= QC_SPC_TIMER;
if (src->dqb_valid & QIF_ITIME)
- dst->d_fieldmask |= FS_DQ_ITIMER;
+ dst->d_fieldmask |= QC_INO_TIMER;
}
static int quota_setquota(struct super_block *sb, int type, qid_t id,
void __user *addr)
{
- struct fs_disk_quota fdq;
+ struct qc_dqblk fdq;
struct if_dqblk idq;
struct kqid qid;
@@ -247,10 +257,78 @@
return ret;
}
+/*
+ * XFS defines BBTOB and BTOBB macros inside fs/xfs/ and we cannot move them
+ * out of there as xfsprogs rely on definitions being in that header file. So
+ * just define same functions here for quota purposes.
+ */
+#define XFS_BB_SHIFT 9
+
+static inline u64 quota_bbtob(u64 blocks)
+{
+ return blocks << XFS_BB_SHIFT;
+}
+
+static inline u64 quota_btobb(u64 bytes)
+{
+ return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
+}
+
+static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
+{
+ dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
+ dst->d_spc_softlimit = quota_bbtob(src->d_blk_softlimit);
+ dst->d_ino_hardlimit = src->d_ino_hardlimit;
+ dst->d_ino_softlimit = src->d_ino_softlimit;
+ dst->d_space = quota_bbtob(src->d_bcount);
+ dst->d_ino_count = src->d_icount;
+ dst->d_ino_timer = src->d_itimer;
+ dst->d_spc_timer = src->d_btimer;
+ dst->d_ino_warns = src->d_iwarns;
+ dst->d_spc_warns = src->d_bwarns;
+ dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
+ dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
+ dst->d_rt_space = quota_bbtob(src->d_rtbcount);
+ dst->d_rt_spc_timer = src->d_rtbtimer;
+ dst->d_rt_spc_warns = src->d_rtbwarns;
+ dst->d_fieldmask = 0;
+ if (src->d_fieldmask & FS_DQ_ISOFT)
+ dst->d_fieldmask |= QC_INO_SOFT;
+ if (src->d_fieldmask & FS_DQ_IHARD)
+ dst->d_fieldmask |= QC_INO_HARD;
+ if (src->d_fieldmask & FS_DQ_BSOFT)
+ dst->d_fieldmask |= QC_SPC_SOFT;
+ if (src->d_fieldmask & FS_DQ_BHARD)
+ dst->d_fieldmask |= QC_SPC_HARD;
+ if (src->d_fieldmask & FS_DQ_RTBSOFT)
+ dst->d_fieldmask |= QC_RT_SPC_SOFT;
+ if (src->d_fieldmask & FS_DQ_RTBHARD)
+ dst->d_fieldmask |= QC_RT_SPC_HARD;
+ if (src->d_fieldmask & FS_DQ_BTIMER)
+ dst->d_fieldmask |= QC_SPC_TIMER;
+ if (src->d_fieldmask & FS_DQ_ITIMER)
+ dst->d_fieldmask |= QC_INO_TIMER;
+ if (src->d_fieldmask & FS_DQ_RTBTIMER)
+ dst->d_fieldmask |= QC_RT_SPC_TIMER;
+ if (src->d_fieldmask & FS_DQ_BWARNS)
+ dst->d_fieldmask |= QC_SPC_WARNS;
+ if (src->d_fieldmask & FS_DQ_IWARNS)
+ dst->d_fieldmask |= QC_INO_WARNS;
+ if (src->d_fieldmask & FS_DQ_RTBWARNS)
+ dst->d_fieldmask |= QC_RT_SPC_WARNS;
+ if (src->d_fieldmask & FS_DQ_BCOUNT)
+ dst->d_fieldmask |= QC_SPACE;
+ if (src->d_fieldmask & FS_DQ_ICOUNT)
+ dst->d_fieldmask |= QC_INO_COUNT;
+ if (src->d_fieldmask & FS_DQ_RTBCOUNT)
+ dst->d_fieldmask |= QC_RT_SPACE;
+}
+
static int quota_setxquota(struct super_block *sb, int type, qid_t id,
void __user *addr)
{
struct fs_disk_quota fdq;
+ struct qc_dqblk qdq;
struct kqid qid;
if (copy_from_user(&fdq, addr, sizeof(fdq)))
@@ -260,13 +338,44 @@
qid = make_kqid(current_user_ns(), type, id);
if (!qid_valid(qid))
return -EINVAL;
- return sb->s_qcop->set_dqblk(sb, qid, &fdq);
+ copy_from_xfs_dqblk(&qdq, &fdq);
+ return sb->s_qcop->set_dqblk(sb, qid, &qdq);
+}
+
+static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
+ int type, qid_t id)
+{
+ memset(dst, 0, sizeof(*dst));
+ dst->d_version = FS_DQUOT_VERSION;
+ dst->d_id = id;
+ if (type == USRQUOTA)
+ dst->d_flags = FS_USER_QUOTA;
+ else if (type == PRJQUOTA)
+ dst->d_flags = FS_PROJ_QUOTA;
+ else
+ dst->d_flags = FS_GROUP_QUOTA;
+ dst->d_blk_hardlimit = quota_btobb(src->d_spc_hardlimit);
+ dst->d_blk_softlimit = quota_btobb(src->d_spc_softlimit);
+ dst->d_ino_hardlimit = src->d_ino_hardlimit;
+ dst->d_ino_softlimit = src->d_ino_softlimit;
+ dst->d_bcount = quota_btobb(src->d_space);
+ dst->d_icount = src->d_ino_count;
+ dst->d_itimer = src->d_ino_timer;
+ dst->d_btimer = src->d_spc_timer;
+ dst->d_iwarns = src->d_ino_warns;
+ dst->d_bwarns = src->d_spc_warns;
+ dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
+ dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
+ dst->d_rtbcount = quota_btobb(src->d_rt_space);
+ dst->d_rtbtimer = src->d_rt_spc_timer;
+ dst->d_rtbwarns = src->d_rt_spc_warns;
}
static int quota_getxquota(struct super_block *sb, int type, qid_t id,
void __user *addr)
{
struct fs_disk_quota fdq;
+ struct qc_dqblk qdq;
struct kqid qid;
int ret;
@@ -275,8 +384,11 @@
qid = make_kqid(current_user_ns(), type, id);
if (!qid_valid(qid))
return -EINVAL;
- ret = sb->s_qcop->get_dqblk(sb, qid, &fdq);
- if (!ret && copy_to_user(addr, &fdq, sizeof(fdq)))
+ ret = sb->s_qcop->get_dqblk(sb, qid, &qdq);
+ if (ret)
+ return ret;
+ copy_to_xfs_dqblk(&fdq, &qdq, type, id);
+ if (copy_to_user(addr, &fdq, sizeof(fdq)))
return -EFAULT;
return ret;
}