* GPL HEADER END
*/
/*
- * Copyright (c) 2013, Intel Corporation.
+ * Copyright (c) 2013, 2014, Intel Corporation.
* Use is subject to license terms.
*
* Author: di wang <di.wang@intel.com>
*/
+/* There are several reasons to restrict the linkEA size:
+ *
+ * 1. Under DNE mode, if we do not restrict the linkEA size, and if there
+ * are too many cross-MDTs hard links to the same object, then it will
+ * casue the llog overflow.
+ *
+ * 2. Some backend has limited size for EA. For example, if without large
+ * EA enabled, the ldiskfs will make all EAs to share one (4K) EA block.
+ *
+ * 3. Too many entries in linkEA will seriously affect linkEA performance
+ * because we only support to locate linkEA entry consecutively. */
+#define MAX_LINKEA_SIZE 4096
+
struct linkea_data {
/**
* Buffer to keep link EA body.
int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf);
int linkea_init(struct linkea_data *ldata);
+int linkea_init_with_rec(struct linkea_data *ldata);
void linkea_entry_unpack(const struct link_ea_entry *lee, int *reclen,
struct lu_name *lname, struct lu_fid *pfid);
+int linkea_entry_pack(struct link_ea_entry *lee, const struct lu_name *lname,
+ const struct lu_fid *pfid);
int linkea_add_buf(struct linkea_data *ldata, const struct lu_name *lname,
const struct lu_fid *pfid);
void linkea_del_buf(struct linkea_data *ldata, const struct lu_name *lname);
+int linkea_links_new(struct linkea_data *ldata, struct lu_buf *buf,
+ const struct lu_name *cname, const struct lu_fid *pfid);
+int linkea_overflow_shrink(struct linkea_data *ldata);
int linkea_links_find(struct linkea_data *ldata, const struct lu_name *lname,
const struct lu_fid *pfid);
-#define LINKEA_NEXT_ENTRY(ldata) \
- (struct link_ea_entry *)((char *)ldata.ld_lee + ldata.ld_reclen)
+static inline void linkea_first_entry(struct linkea_data *ldata)
+{
+ LASSERT(ldata != NULL);
+ LASSERT(ldata->ld_leh != NULL);
+
+ if (ldata->ld_leh->leh_reccount == 0)
+ ldata->ld_lee = NULL;
+ else
+ ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1);
+}
+
+static inline void linkea_next_entry(struct linkea_data *ldata)
+{
+ LASSERT(ldata != NULL);
+ LASSERT(ldata->ld_leh != NULL);
-#define LINKEA_FIRST_ENTRY(ldata) \
- (struct link_ea_entry *)(ldata.ld_leh + 1)
+ if (ldata->ld_lee != NULL) {
+ ldata->ld_lee = (struct link_ea_entry *)((char *)ldata->ld_lee +
+ ldata->ld_reclen);
+ if ((char *)ldata->ld_lee >= ((char *)ldata->ld_leh +
+ ldata->ld_leh->leh_len))
+ ldata->ld_lee = NULL;
+ }
+}