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authorJan Kara <jack@suse.cz>2014-10-09 18:03:13 +0400
committerJan Kara <jack@suse.cz>2015-01-28 11:01:40 +0300
commit14bf61ffe6ac54afcd1e888a4407fe16054483db (patch)
treeb5af94fc8771e82735064a82a7df4ec4de66744e /fs/xfs/xfs_quotaops.c
parentb07ef35244424cbeda9844198607c7077099c82c (diff)
downloadlinux-14bf61ffe6ac54afcd1e888a4407fe16054483db.tar.xz
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>
Diffstat (limited to 'fs/xfs/xfs_quotaops.c')
-rw-r--r--fs/xfs/xfs_quotaops.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/xfs/xfs_quotaops.c b/fs/xfs/xfs_quotaops.c
index 7542bbeca6a1..801a84c1cdc3 100644
--- a/fs/xfs/xfs_quotaops.c
+++ b/fs/xfs/xfs_quotaops.c
@@ -131,7 +131,7 @@ STATIC int
xfs_fs_get_dqblk(
struct super_block *sb,
struct kqid qid,
- struct fs_disk_quota *fdq)
+ struct qc_dqblk *qdq)
{
struct xfs_mount *mp = XFS_M(sb);
@@ -141,14 +141,14 @@ xfs_fs_get_dqblk(
return -ESRCH;
return xfs_qm_scall_getquota(mp, from_kqid(&init_user_ns, qid),
- xfs_quota_type(qid.type), fdq);
+ xfs_quota_type(qid.type), qdq);
}
STATIC int
xfs_fs_set_dqblk(
struct super_block *sb,
struct kqid qid,
- struct fs_disk_quota *fdq)
+ struct qc_dqblk *qdq)
{
struct xfs_mount *mp = XFS_M(sb);
@@ -160,7 +160,7 @@ xfs_fs_set_dqblk(
return -ESRCH;
return xfs_qm_scall_setqlim(mp, from_kqid(&init_user_ns, qid),
- xfs_quota_type(qid.type), fdq);
+ xfs_quota_type(qid.type), qdq);
}
const struct quotactl_ops xfs_quotactl_operations = {