In Q_XSETQLIMIT use sb->s_user_ns to detect when we are dealing with
the filesystems notion of id 0.
For the dquot hashfn translate the qid into sb->s_user_ns to remove
extraneous bits before hashing.
When dealing with generic quota files in quota_tree.c, quota_v1.c, and
quota_v2.c before writing quotas to the file encode them in
sb->s_user_ns, and decode ids read from the file from sb->s_user_ns.
One complication comes up in qtree_get_next_id, as it is possible in
principle for id's to be present in the quota file that do not have a
mapping in the filesystems user namespace. If that is the case the
code is modified to skip the unmapped ids.
Inspired-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
---
fs/quota/dquot.c | 4 ++--
fs/quota/quota.c | 2 +-
fs/quota/quota_tree.c | 23 ++++++++++++++---------
fs/quota/quota_v1.c | 6 ++++--
fs/quota/quota_v2.c | 10 ++++++----
5 files changed, 27 insertions(+), 18 deletions(-)
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 74706b6aa747..9b39925f34f4 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -252,7 +252,7 @@ static int __dquot_initialize(struct inode *inode, int type);
static inline unsigned int
hashfn(const struct super_block *sb, struct kqid qid)
{
- unsigned int id = from_kqid(&init_user_ns, qid);
+ unsigned int id = from_kqid(sb->s_user_ns, qid);
int type = qid.type;
unsigned long tmp;
@@ -748,7 +748,7 @@ void dqput(struct dquot *dquot)
if (!atomic_read(&dquot->dq_count)) {
quota_error(dquot->dq_sb, "trying to free free dquot of %s %d",
quotatypes[dquot->dq_id.type],
- from_kqid(&init_user_ns, dquot->dq_id));
+ from_kqid(dquot->dq_sb->s_user_ns, dquot->dq_id));
BUG();
}
#endif
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 73f6f4cf0a21..35df08ee9c97 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -584,7 +584,7 @@ static int quota_setxquota(struct super_block *sb, int type, qid_t id,
if (!qid_has_mapping(sb->s_user_ns, qid))
return -EINVAL;
/* Are we actually setting timer / warning limits for all users? */
- if (from_kqid(&init_user_ns, qid) == 0 &&
+ if (from_kqid(sb->s_user_ns, qid) == 0 &&
fdq.d_fieldmask & (FS_DQ_WARNS_MASK | FS_DQ_TIMER_MASK)) {
struct qc_info qinfo;
int ret;
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
index 0738972e8d3f..4f8f6bdc698c 100644
--- a/fs/quota/quota_tree.c
+++ b/fs/quota/quota_tree.c
@@ -34,7 +34,7 @@ static int __get_index(struct qtree_mem_dqinfo *info, qid_t id, int depth)
static int get_index(struct qtree_mem_dqinfo *info, struct kqid qid, int depth)
{
- qid_t id = from_kqid(&init_user_ns, qid);
+ qid_t id = from_kqid(info->dqi_sb->s_user_ns, qid);
return __get_index(info, id, depth);
}
@@ -554,7 +554,7 @@ static loff_t find_block_dqentry(struct qtree_mem_dqinfo *info,
if (i == qtree_dqstr_in_blk(info)) {
quota_error(dquot->dq_sb,
"Quota for id %u referenced but not present",
- from_kqid(&init_user_ns, dquot->dq_id));
+ from_kqid(dquot->dq_sb->s_user_ns, dquot->dq_id));
ret = -EIO;
goto out_buf;
} else {
@@ -624,7 +624,7 @@ int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
if (offset < 0)
quota_error(sb,"Can't read quota structure "
"for id %u",
- from_kqid(&init_user_ns,
+ from_kqid(sb->s_user_ns,
dquot->dq_id));
dquot->dq_off = 0;
set_bit(DQ_FAKE_B, &dquot->dq_flags);
@@ -643,7 +643,7 @@ int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
if (ret >= 0)
ret = -EIO;
quota_error(sb, "Error while reading quota structure for id %u",
- from_kqid(&init_user_ns, dquot->dq_id));
+ from_kqid(sb->s_user_ns, dquot->dq_id));
set_bit(DQ_FAKE_B, &dquot->dq_flags);
memset(&dquot->dq_dqb, 0, sizeof(struct mem_dqblk));
kfree(ddquot);
@@ -721,13 +721,18 @@ out_buf:
int qtree_get_next_id(struct qtree_mem_dqinfo *info, struct kqid *qid)
{
- qid_t id = from_kqid(&init_user_ns, *qid);
+ qid_t id = from_kqid(info->dqi_sb->s_user_ns, *qid);
+ struct kqid next_id;
int ret;
- ret = find_next_id(info, &id, QT_TREEOFF, 0);
- if (ret < 0)
- return ret;
- *qid = make_kqid(&init_user_ns, qid->type, id);
+ do {
+ ret = find_next_id(info, &id, QT_TREEOFF, 0);
+ if (ret < 0)
+ return ret;
+ next_id = make_kqid(info->dqi_sb->s_user_ns, qid->type, id);
+ } while (!qid_valid(next_id)); /* Loop until a mapped id is found */
+
+ *qid = next_id;
return 0;
}
EXPORT_SYMBOL(qtree_get_next_id);
diff --git a/fs/quota/quota_v1.c b/fs/quota/quota_v1.c
index 8fe79beced5c..087e7743b996 100644
--- a/fs/quota/quota_v1.c
+++ b/fs/quota/quota_v1.c
@@ -54,6 +54,7 @@ static void v1_mem2disk_dqblk(struct v1_disk_dqblk *d, struct mem_dqblk *m)
static int v1_read_dqblk(struct dquot *dquot)
{
+ struct user_namespace *dq_user_ns = dquot->dq_sb->s_user_ns;
int type = dquot->dq_id.type;
struct v1_disk_dqblk dqblk;
@@ -64,7 +65,7 @@ static int v1_read_dqblk(struct dquot *dquot)
memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
dquot->dq_sb->s_op->quota_read(dquot->dq_sb, type, (char *)&dqblk,
sizeof(struct v1_disk_dqblk),
- v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
+ v1_dqoff(from_kqid(dq_user_ns, dquot->dq_id));
v1_disk2mem_dqblk(&dquot->dq_dqb, &dqblk);
if (dquot->dq_dqb.dqb_bhardlimit == 0 &&
@@ -79,6 +80,7 @@ static int v1_read_dqblk(struct dquot *dquot)
static int v1_commit_dqblk(struct dquot *dquot)
{
+ struct user_namespace *dq_user_ns = dquot->dq_sb->s_user_ns;
short type = dquot->dq_id.type;
ssize_t ret;
struct v1_disk_dqblk dqblk;
@@ -95,7 +97,7 @@ static int v1_commit_dqblk(struct dquot *dquot)
if (sb_dqopt(dquot->dq_sb)->files[type])
ret = dquot->dq_sb->s_op->quota_write(dquot->dq_sb, type,
(char *)&dqblk, sizeof(struct v1_disk_dqblk),
- v1_dqoff(from_kqid(&init_user_ns, dquot->dq_id)));
+ v1_dqoff(from_kquid(dq_user_ns, dquot->dq_id)));
if (ret != sizeof(struct v1_disk_dqblk)) {
quota_error(dquot->dq_sb, "dquota write failed");
if (ret >= 0)
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index ca71bf881ad1..4ecf91611a87 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -199,6 +199,7 @@ static void v2r0_disk2memdqb(struct dquot *dquot, void *dp)
static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
{
+ struct user_namespace *dq_user_ns = dquot->dq_sb->s_user_ns;
struct v2r0_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
struct qtree_mem_dqinfo *info =
@@ -212,7 +213,7 @@ static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot)
d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit));
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
d->dqb_btime = cpu_to_le64(m->dqb_btime);
- d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
+ d->dqb_id = cpu_to_le32(from_kqid(dq_user_ns, dquot->dq_qid));
if (qtree_entry_unused(info, dp))
d->dqb_itime = cpu_to_le64(1);
}
@@ -225,7 +226,7 @@ static int v2r0_is_id(void *dp, struct dquot *dquot)
if (qtree_entry_unused(info, dp))
return 0;
- return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
+ return qid_eq(make_kqid(dquot->dq_sb->s_user_ns, quot->dq_id.type,
le32_to_cpu(d->dqb_id)),
dquot->dq_id);
}
@@ -252,6 +253,7 @@ static void v2r1_disk2memdqb(struct dquot *dquot, void *dp)
static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
{
+ struct user_namespace *dq_user_ns = dquot->dq_sb->s_user_ns;
struct v2r1_disk_dqblk *d = dp;
struct mem_dqblk *m = &dquot->dq_dqb;
struct qtree_mem_dqinfo *info =
@@ -265,7 +267,7 @@ static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot)
d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit));
d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
d->dqb_btime = cpu_to_le64(m->dqb_btime);
- d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
+ d->dqb_id = cpu_to_le32(from_kqid(dq_user_ns, dquot->dq_id));
if (qtree_entry_unused(info, dp))
d->dqb_itime = cpu_to_le64(1);
}
@@ -278,7 +280,7 @@ static int v2r1_is_id(void *dp, struct dquot *dquot)
if (qtree_entry_unused(info, dp))
return 0;
- return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
+ return qid_eq(make_kqid(dquot->dq_sb->s_user_ns, dquot->dq_id.type,
le32_to_cpu(d->dqb_id)),
dquot->dq_id);
}
--
2.8.3
--
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