Commit 0066373d authored by Jan Kara's avatar Jan Kara

quota_v2: Implement get_next_id() for V2 quota format

Implement functions to get id of next existing quota structure in quota
file for quota tree based formats and thus for V2 quota format.
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent be6257b2
......@@ -22,10 +22,9 @@ MODULE_LICENSE("GPL");
#define __QUOTA_QT_PARANOIA
static int get_index(struct qtree_mem_dqinfo *info, struct kqid qid, int depth)
static int __get_index(struct qtree_mem_dqinfo *info, qid_t id, int depth)
{
unsigned int epb = info->dqi_usable_bs >> 2;
qid_t id = from_kqid(&init_user_ns, qid);
depth = info->dqi_qtree_depth - depth - 1;
while (depth--)
......@@ -33,6 +32,13 @@ static int get_index(struct qtree_mem_dqinfo *info, struct kqid qid, int depth)
return id % epb;
}
static int get_index(struct qtree_mem_dqinfo *info, struct kqid qid, int depth)
{
qid_t id = from_kqid(&init_user_ns, qid);
return __get_index(info, id, depth);
}
/* Number of entries in one blocks */
static int qtree_dqstr_in_blk(struct qtree_mem_dqinfo *info)
{
......@@ -668,3 +674,60 @@ int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot)
return 0;
}
EXPORT_SYMBOL(qtree_release_dquot);
static int find_next_id(struct qtree_mem_dqinfo *info, qid_t *id,
unsigned int blk, int depth)
{
char *buf = getdqbuf(info->dqi_usable_bs);
__le32 *ref = (__le32 *)buf;
ssize_t ret;
unsigned int epb = info->dqi_usable_bs >> 2;
unsigned int level_inc = 1;
int i;
if (!buf)
return -ENOMEM;
for (i = depth; i < info->dqi_qtree_depth - 1; i++)
level_inc *= epb;
ret = read_blk(info, blk, buf);
if (ret < 0) {
quota_error(info->dqi_sb,
"Can't read quota tree block %u", blk);
goto out_buf;
}
for (i = __get_index(info, *id, depth); i < epb; i++) {
if (ref[i] == cpu_to_le32(0)) {
*id += level_inc;
continue;
}
if (depth == info->dqi_qtree_depth - 1) {
ret = 0;
goto out_buf;
}
ret = find_next_id(info, id, le32_to_cpu(ref[i]), depth + 1);
if (ret != -ENOENT)
break;
}
if (i == epb) {
ret = -ENOENT;
goto out_buf;
}
out_buf:
kfree(buf);
return ret;
}
int qtree_get_next_id(struct qtree_mem_dqinfo *info, struct kqid *qid)
{
qid_t id = from_kqid(&init_user_ns, *qid);
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);
return 0;
}
EXPORT_SYMBOL(qtree_get_next_id);
......@@ -304,6 +304,11 @@ static int v2_free_file_info(struct super_block *sb, int type)
return 0;
}
static int v2_get_next_id(struct super_block *sb, struct kqid *qid)
{
return qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid);
}
static const struct quota_format_ops v2_format_ops = {
.check_quota_file = v2_check_quota_file,
.read_file_info = v2_read_file_info,
......@@ -312,6 +317,7 @@ static const struct quota_format_ops v2_format_ops = {
.read_dqblk = v2_read_dquot,
.commit_dqblk = v2_write_dquot,
.release_dqblk = v2_release_dquot,
.get_next_id = v2_get_next_id,
};
static struct quota_format_type v2r0_quota_format = {
......
......@@ -15,6 +15,7 @@
#define QTREE_DEL_REWRITE 6
struct dquot;
struct kqid;
/* Operations */
struct qtree_fmt_operations {
......@@ -52,5 +53,6 @@ static inline int qtree_depth(struct qtree_mem_dqinfo *info)
entries *= epb;
return i;
}
int qtree_get_next_id(struct qtree_mem_dqinfo *info, struct kqid *qid);
#endif /* _LINUX_DQBLK_QTREE_H */
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment