~~~~~~~~~~~~~~~~~~~~~~~
[[llog]]
-LLOG Log ID
-^^^^^^^^^^^
-
-----
-struct llog_logid {
- struct ost_id lgl_oi;
- __u32 lgl_ogen;
-};
-----
-
-LLog Information
-^^^^^^^^^^^^^^^^
-
-----
-struct llogd_body {
- struct llog_logid lgd_logid;
- __u32 lgd_ctxt_idx;
- __u32 lgd_llh_flags;
- __u32 lgd_index;
- __u32 lgd_saved_index;
- __u32 lgd_len;
- __u64 lgd_cur_offset;
-};
-----
-
-The lgd_llh_flags are:
-----
-enum llog_flag {
- LLOG_F_ZAP_WHEN_EMPTY = 0x1,
- LLOG_F_IS_CAT = 0x2,
- LLOG_F_IS_PLAIN = 0x4,
-};
-----
-
-LLog Record Header
-^^^^^^^^^^^^^^^^^^
-
-----
-struct llog_rec_hdr {
- __u32 lrh_len;
- __u32 lrh_index;
- __u32 lrh_type;
- __u32 lrh_id;
-};
-----
-
-LLog Record Tail
-^^^^^^^^^^^^^^^^
-
-----
-struct llog_rec_tail {
- __u32 lrt_len;
- __u32 lrt_index;
-};
-----
-
-LLog Log Header Information
-^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-----
-struct llog_log_hdr {
- struct llog_rec_hdr llh_hdr;
- obd_time llh_timestamp;
- __u32 llh_count;
- __u32 llh_bitmap_offset;
- __u32 llh_size;
- __u32 llh_flags;
- __u32 llh_cat_idx;
- /* for a catalog the first plain slot is next to it */
- struct obd_uuid llh_tgtuuid;
- __u32 llh_reserved[LLOG_HEADER_SIZE/sizeof(__u32) - 23];
- __u32 llh_bitmap[LLOG_BITMAP_BYTES/sizeof(__u32)];
- struct llog_rec_tail llh_tail;
-};
-----
-
+The Lustre log (llog) file may contain a number of different types of
+data structures, including redo records for uncommitted distributed
+transactions such as unlink or ownership changes, configuration records
+for targets and clients, or ChangeLog records to track changes to the
+filesystem for external consumption, among others.