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-rw-r--r--include/linux/gfs2_ondisk.h30
1 files changed, 29 insertions, 1 deletions
diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
index a44a6a078f0..c3c19f926e6 100644
--- a/include/linux/gfs2_ondisk.h
+++ b/include/linux/gfs2_ondisk.h
@@ -170,6 +170,33 @@ struct gfs2_rgrp {
};
/*
+ * quota linked list: user quotas and group quotas form two separate
+ * singly linked lists. ll_next stores uids or gids of next quotas in the
+ * linked list.
+
+Given the uid/gid, how to calculate the quota file offsets for the corresponding
+gfs2_quota structures on disk:
+
+for user quotas, given uid,
+offset = uid * sizeof(struct gfs2_quota);
+
+for group quotas, given gid,
+offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota);
+
+
+ uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142
++-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
+| valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid |
++-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+
+next:12 next:12 next:17 next:5142 next:NULL next:NULL
+ | | | | |<-- user quota list |
+ \______|___________/ \______|___________/ group quota list -->|
+ | | |
+ \__________________/ \_______________________________________/
+
+*/
+
+/*
* quota structure
*/
@@ -177,7 +204,8 @@ struct gfs2_quota {
__be64 qu_limit;
__be64 qu_warn;
__be64 qu_value;
- __u8 qu_reserved[64];
+ __be32 qu_ll_next; /* location of next quota in list */
+ __u8 qu_reserved[60];
};
/*