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xfs: always return -ENOSPC on project quota reservation failure 

XFS project quota treats project hierarchies as "mini filesysems" and
so rather than -EDQUOT, the intent is to return -ENOSPC when a quota
reservation fails, but this behavior is not consistent.

The only place we make a decision between -EDQUOT and -ENOSPC
returns based on quota type is in xfs_trans_dqresv().

This behavior is currently controlled by whether or not the
XFS_QMOPT_ENOSPC flag gets passed into the quota reservation.  However,
its use is not consistent; paths such as xfs_create() and xfs_symlink()
don't set the flag, so a reservation failure will return -EDQUOT for
project quota reservation failures rather than -ENOSPC for these sorts
of operations, even for project quota:

# mkdir mnt/project
# xfs_quota -x -c "project -s -p mnt/project 42" mnt
# xfs_quota -x -c 'limit -p isoft=2 ihard=3 42' mnt
# touch mnt/project/file{1,2,3}
touch: cannot touch ‘mnt/project/file3’: Disk quota exceeded

We can make this consistent by not requiring the flag to be set at the
top of the callchain; instead we can simply test whether we are
reserving a project quota with XFS_QM_ISPDQ in xfs_trans_dqresv and if
so, return -ENOSPC for that failure.  This removes the need for the
XFS_QMOPT_ENOSPC altogether and simplifies the code a fair bit.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Eric Sandeen 2020-05-21 13:06:59 -07:00 committed by Darrick J. Wong
parent c8d329f311
commit dcf1ccc99e
3 changed files with 8 additions and 18 deletions
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1
fs/xfs/libxfs/xfs_quota_defs.h
View File

@ -100,7 +100,6 @@ typedef uint16_t xfs_qwarncnt_t;
#define XFS_QMOPT_FORCE_RES 0x0000010 /* ignore quota limits */
#define XFS_QMOPT_SBVERSION 0x0000040 /* change superblock version num */
#define XFS_QMOPT_GQUOTA 0x0002000 /* group dquot requested */
#define XFS_QMOPT_ENOSPC 0x0004000 /* enospc instead of edquot (prj) */
/*
* flags to xfs_trans_mod_dquot to indicate which field needs to be

9
fs/xfs/xfs_qm.c
View File

@ -1808,7 +1808,7 @@ xfs_qm_vop_chown_reserve(
{
struct xfs_mount *mp = ip->i_mount;
uint64_t delblks;
unsigned int blkflags, prjflags = 0;
unsigned int blkflags;
struct xfs_dquot *udq_unres = NULL;
struct xfs_dquot *gdq_unres = NULL;
struct xfs_dquot *pdq_unres = NULL;
@ -1849,7 +1849,6 @@ xfs_qm_vop_chown_reserve(
if (XFS_IS_PQUOTA_ON(ip->i_mount) && pdqp &&
ip->i_d.di_projid != be32_to_cpu(pdqp->q_core.d_id)) {
prjflags = XFS_QMOPT_ENOSPC;
pdq_delblks = pdqp;
if (delblks) {
ASSERT(ip->i_pdquot);
@ -1859,8 +1858,7 @@ xfs_qm_vop_chown_reserve(
error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
udq_delblks, gdq_delblks, pdq_delblks,
ip->i_d.di_nblocks, 1,
flags | blkflags | prjflags);
ip->i_d.di_nblocks, 1, flags | blkflags);
if (error)
return error;
@ -1878,8 +1876,7 @@ xfs_qm_vop_chown_reserve(
ASSERT(udq_unres || gdq_unres || pdq_unres);
error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
udq_delblks, gdq_delblks, pdq_delblks,
(xfs_qcnt_t)delblks, 0,
flags | blkflags | prjflags);
(xfs_qcnt_t)delblks, 0, flags | blkflags);
if (error)
return error;
xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,

16
fs/xfs/xfs_trans_dquot.c
View File

@ -711,7 +711,7 @@ xfs_trans_dqresv(
error_return:
xfs_dqunlock(dqp);
if (flags & XFS_QMOPT_ENOSPC)
if (XFS_QM_ISPDQ(dqp))
return -ENOSPC;
return -EDQUOT;
}
@ -751,15 +751,13 @@ xfs_trans_reserve_quota_bydquots(
ASSERT(flags & XFS_QMOPT_RESBLK_MASK);
if (udqp) {
error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos,
(flags & ~XFS_QMOPT_ENOSPC));
error = xfs_trans_dqresv(tp, mp, udqp, nblks, ninos, flags);
if (error)
return error;
}
if (gdqp) {
error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos,
(flags & ~XFS_QMOPT_ENOSPC));
error = xfs_trans_dqresv(tp, mp, gdqp, nblks, ninos, flags);
if (error)
goto unwind_usr;
}
@ -804,16 +802,12 @@ xfs_trans_reserve_quota_nblks(
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
return 0;
if (XFS_IS_PQUOTA_ON(mp))
flags |= XFS_QMOPT_ENOSPC;
ASSERT(!xfs_is_quota_inode(&mp->m_sb, ip->i_ino));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT((flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
XFS_TRANS_DQ_RES_RTBLKS ||
(flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
XFS_TRANS_DQ_RES_BLKS);
ASSERT((flags & ~(XFS_QMOPT_FORCE_RES)) == XFS_TRANS_DQ_RES_RTBLKS ||
(flags & ~(XFS_QMOPT_FORCE_RES)) == XFS_TRANS_DQ_RES_BLKS);
/*
* Reserve nblks against these dquots, with trans as the mediator.