[RFC PATCH mtd-utils 073/110] fsck.ubifs: rebuild_fs: Build LPT
Zhihao Cheng
chengzhihao1 at huawei.com
Thu Jun 6 21:25:38 PDT 2024
This is the 10/12 step of rebuilding. All LEBs' properties can be
calculated in previous steps according to all nodes' position, then
construct LPT just like mkfs does, and write LPT on flash.
Signed-off-by: Zhihao Cheng <chengzhihao1 at huawei.com>
---
ubifs-utils/fsck.ubifs/fsck.ubifs.h | 2 +
ubifs-utils/fsck.ubifs/rebuild_fs.c | 149 ++++++++++++++++++++++++++++--------
ubifs-utils/libubifs/ubifs.h | 2 +
3 files changed, 119 insertions(+), 34 deletions(-)
diff --git a/ubifs-utils/fsck.ubifs/fsck.ubifs.h b/ubifs-utils/fsck.ubifs/fsck.ubifs.h
index bc1d7503..1d97aed3 100644
--- a/ubifs-utils/fsck.ubifs/fsck.ubifs.h
+++ b/ubifs-utils/fsck.ubifs/fsck.ubifs.h
@@ -186,6 +186,7 @@ struct scanned_file {
* @write_buf: write buffer for LEB @head_lnum
* @head_lnum: current writing LEB number
* @head_offs: current writing position in LEB @head_lnum
+ * @need_update_lpt: whether to update lpt while writing index nodes
*/
struct ubifs_rebuild_info {
unsigned long *used_lebs;
@@ -194,6 +195,7 @@ struct ubifs_rebuild_info {
void *write_buf;
int head_lnum;
int head_offs;
+ bool need_update_lpt;
};
/**
diff --git a/ubifs-utils/fsck.ubifs/rebuild_fs.c b/ubifs-utils/fsck.ubifs/rebuild_fs.c
index e1d1957f..085df2b9 100644
--- a/ubifs-utils/fsck.ubifs/rebuild_fs.c
+++ b/ubifs-utils/fsck.ubifs/rebuild_fs.c
@@ -489,6 +489,22 @@ lookup_valid_dent_node(struct ubifs_info *c, struct scanned_info *si,
return NULL;
}
+static void update_lpt(struct ubifs_info *c, struct scanned_node *sn,
+ bool deleted)
+{
+ int index = sn->lnum - c->main_first;
+ int pos = sn->offs + ALIGN(sn->len, 8);
+
+ set_bit(index, FSCK(c)->rebuild->used_lebs);
+ FSCK(c)->rebuild->lpts[index].end = max_t(int,
+ FSCK(c)->rebuild->lpts[index].end, pos);
+
+ if (deleted)
+ return;
+
+ FSCK(c)->rebuild->lpts[index].used += ALIGN(sn->len, 8);
+}
+
/**
* remove_del_nodes - remove deleted nodes from valid node tree.
* @c: UBIFS file-system description object
@@ -512,13 +528,7 @@ static void remove_del_nodes(struct ubifs_info *c, struct scanned_info *si)
valid_ino_node = lookup_valid_ino_node(c, si, del_ino_node);
if (valid_ino_node) {
- int lnum = del_ino_node->header.lnum - c->main_first;
- int pos = del_ino_node->header.offs +
- ALIGN(del_ino_node->header.len, 8);
-
- set_bit(lnum, FSCK(c)->rebuild->used_lebs);
- FSCK(c)->rebuild->lpts[lnum].end =
- max_t(int, FSCK(c)->rebuild->lpts[lnum].end, pos);
+ update_lpt(c, &del_ino_node->header, true);
rb_erase(&valid_ino_node->rb, &si->valid_inos);
kfree(valid_ino_node);
}
@@ -534,13 +544,7 @@ static void remove_del_nodes(struct ubifs_info *c, struct scanned_info *si)
valid_dent_node = lookup_valid_dent_node(c, si, del_dent_node);
if (valid_dent_node) {
- int lnum = del_dent_node->header.lnum - c->main_first;
- int pos = del_dent_node->header.offs +
- ALIGN(del_dent_node->header.len, 8);
-
- set_bit(lnum, FSCK(c)->rebuild->used_lebs);
- FSCK(c)->rebuild->lpts[lnum].end =
- max_t(int, FSCK(c)->rebuild->lpts[lnum].end, pos);
+ update_lpt(c, &del_dent_node->header, true);
rb_erase(&valid_dent_node->rb, &si->valid_dents);
kfree(valid_dent_node);
}
@@ -730,12 +734,12 @@ static void init_root_ino(struct ubifs_info *c, struct ubifs_ino_node *ino)
* get_free_leb - get a free LEB according to @FSCK(c)->rebuild->used_lebs.
* @c: UBIFS file-system description object
*
- * This function tries to find a free LEB, %0 is returned if found, otherwise
- * %ENOSPC is returned.
+ * This function tries to find a free LEB, lnum is returned if found, otherwise
+ * %-ENOSPC is returned.
*/
static int get_free_leb(struct ubifs_info *c)
{
- int lnum, err;
+ int lnum;
lnum = find_next_zero_bit(FSCK(c)->rebuild->used_lebs, c->main_lebs, 0);
if (lnum >= c->main_lebs) {
@@ -745,14 +749,7 @@ static int get_free_leb(struct ubifs_info *c)
set_bit(lnum, FSCK(c)->rebuild->used_lebs);
lnum += c->main_first;
- err = ubifs_leb_unmap(c, lnum);
- if (err)
- return err;
-
- FSCK(c)->rebuild->head_lnum = lnum;
- FSCK(c)->rebuild->head_offs = 0;
-
- return 0;
+ return lnum;
}
/**
@@ -780,6 +777,14 @@ static int flush_write_buf(struct ubifs_info *c)
if (err)
return err;
+ if (FSCK(c)->rebuild->need_update_lpt) {
+ int index = FSCK(c)->rebuild->head_lnum - c->main_first;
+
+ FSCK(c)->rebuild->lpts[index].free = c->leb_size - len;
+ FSCK(c)->rebuild->lpts[index].dirty = pad;
+ FSCK(c)->rebuild->lpts[index].flags = LPROPS_INDEX;
+ }
+
FSCK(c)->rebuild->head_lnum = -1;
return 0;
@@ -797,13 +802,20 @@ static int flush_write_buf(struct ubifs_info *c)
*/
static int reserve_space(struct ubifs_info *c, int len, int *lnum, int *offs)
{
- int err;
+ int err, new_lnum;
if (FSCK(c)->rebuild->head_lnum == -1) {
get_new:
- err = get_free_leb(c);
+ new_lnum = get_free_leb(c);
+ if (new_lnum < 0)
+ return new_lnum;
+
+ err = ubifs_leb_unmap(c, new_lnum);
if (err)
return err;
+
+ FSCK(c)->rebuild->head_lnum = new_lnum;
+ FSCK(c)->rebuild->head_offs = 0;
}
if (len > c->leb_size - FSCK(c)->rebuild->head_offs) {
@@ -921,15 +933,9 @@ static int parse_node_info(struct ubifs_info *c, struct scanned_node *sn,
union ubifs_key *key, char *name, int name_len,
struct list_head *idx_list, int *idx_cnt)
{
- int lnum, pos;
struct idx_entry *e;
- lnum = sn->lnum - c->main_first;
- pos = sn->offs + ALIGN(sn->len, 8);
-
- set_bit(lnum, FSCK(c)->rebuild->used_lebs);
- FSCK(c)->rebuild->lpts[lnum].end = max_t(int,
- FSCK(c)->rebuild->lpts[lnum].end, pos);
+ update_lpt(c, sn, idx_cnt == NULL);
if (idx_cnt == NULL)
/* Skip truncation node. */
@@ -1026,6 +1032,7 @@ static int build_tnc(struct ubifs_info *c, struct list_head *lower_idxs,
return -ENOMEM;
list_sort(c, lower_idxs, cmp_idx);
+ FSCK(c)->rebuild->need_update_lpt = true;
ubifs_assert(c, lower_cnt != 0);
@@ -1089,6 +1096,7 @@ static int build_tnc(struct ubifs_info *c, struct list_head *lower_idxs,
/* Flush the last index LEB */
err = flush_write_buf(c);
+ FSCK(c)->rebuild->need_update_lpt = false;
out:
list_for_each_entry_safe(e, tmp_e, lower_idxs, list) {
@@ -1239,6 +1247,71 @@ out_idx_list:
}
/**
+ * build_lpt - construct LPT and write it into flash.
+ * @c: UBIFS file-system description object
+ *
+ * This function builds LPT according to @FSCK(c)->rebuild->lpts and writes
+ * LPT into flash.
+ */
+static int build_lpt(struct ubifs_info *c)
+{
+ int i, len, free, dirty, lnum;
+ u8 hash_lpt[UBIFS_HASH_ARR_SZ];
+
+ memset(&c->lst, 0, sizeof(struct ubifs_lp_stats));
+ /* Set gc lnum. */
+ lnum = get_free_leb(c);
+ if (lnum < 0)
+ return lnum;
+ c->gc_lnum = lnum;
+
+ /* Update LPT. */
+ for (i = 0; i < c->main_lebs; i++) {
+ if (!test_bit(i, FSCK(c)->rebuild->used_lebs) ||
+ c->gc_lnum == i + c->main_first) {
+ free = c->leb_size;
+ dirty = 0;
+ } else if (FSCK(c)->rebuild->lpts[i].flags & LPROPS_INDEX) {
+ free = FSCK(c)->rebuild->lpts[i].free;
+ dirty = FSCK(c)->rebuild->lpts[i].dirty;
+ } else {
+ len = ALIGN(FSCK(c)->rebuild->lpts[i].end, c->min_io_size);
+ free = c->leb_size - len;
+ dirty = len - FSCK(c)->rebuild->lpts[i].used;
+
+ if (dirty == c->leb_size) {
+ free = c->leb_size;
+ dirty = 0;
+ }
+ }
+
+ FSCK(c)->rebuild->lpts[i].free = free;
+ FSCK(c)->rebuild->lpts[i].dirty = dirty;
+ c->lst.total_free += free;
+ c->lst.total_dirty += dirty;
+
+ if (free == c->leb_size)
+ c->lst.empty_lebs++;
+
+ if (!(FSCK(c)->rebuild->lpts[i].flags & LPROPS_INDEX)) {
+ int spc;
+
+ spc = free + dirty;
+ if (spc < c->dead_wm)
+ c->lst.total_dead += spc;
+ else
+ c->lst.total_dark += ubifs_calc_dark(c, spc);
+ c->lst.total_used += c->leb_size - spc;
+ } else {
+ c->lst.idx_lebs += 1;
+ }
+ }
+
+ /* Write LPT. */
+ return ubifs_create_lpt(c, FSCK(c)->rebuild->lpts, c->main_lebs, hash_lpt);
+}
+
+/**
* ubifs_rebuild_filesystem - Rebuild filesystem.
* @c: UBIFS file-system description object
*
@@ -1302,6 +1375,14 @@ int ubifs_rebuild_filesystem(struct ubifs_info *c)
* Step 9: Build TNC.
*/
err = traverse_files_and_nodes(c);
+ if (err) {
+ exit_code |= FSCK_ERROR;
+ goto out;
+ }
+
+ /* Step 10. Build LPT. */
+ log_out(c, "Build LPT");
+ err = build_lpt(c);
if (err)
exit_code |= FSCK_ERROR;
diff --git a/ubifs-utils/libubifs/ubifs.h b/ubifs-utils/libubifs/ubifs.h
index c9d582da..6f965555 100644
--- a/ubifs-utils/libubifs/ubifs.h
+++ b/ubifs-utils/libubifs/ubifs.h
@@ -338,6 +338,7 @@ enum {
* @flags: LEB properties flags (see above)
* @lnum: LEB number
* @end: the end postition of LEB calculated by the last node
+ * @used: amount of used space in bytes
* @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE)
* @hpos: heap position in heap of same-category lprops (other categories)
*/
@@ -347,6 +348,7 @@ struct ubifs_lprops {
int flags;
int lnum;
int end;
+ int used;
union {
struct list_head list;
int hpos;
--
2.13.6
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