* if snum1 is larger than 0 we put items into the new node s1
* if snum2 is larger than 0 we put items into the new node s2
* Note that all *num* count new items being created.
- *
- * It would be easier to read balance_leaf() if each of these summary
- * lines was a separate procedure rather than being inlined. I think
- * that there are many passages here and in balance_leaf_when_delete() in
- * which two calls to one procedure can replace two passages, and it
- * might save cache space and improve software maintenance costs to do so.
- *
- * Vladimir made the perceptive comment that we should offload most of
- * the decision making in this function into fix_nodes/check_balance, and
- * then create some sort of structure in tb that says what actions should
- * be performed by do_balance.
- *
- * -Hans
*/
+static void balance_leaf_when_delete_del(struct tree_balance *tb)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int item_pos = PATH_LAST_POSITION(tb->tb_path);
+ struct buffer_info bi;
+#ifdef CONFIG_REISERFS_CHECK
+ struct item_head *ih = item_head(tbS0, item_pos);
+#endif
+
+ RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0],
+ "vs-12013: mode Delete, insert size %d, ih to be deleted %h",
+ -tb->insert_size[0], ih);
+
+ buffer_info_init_tbS0(tb, &bi);
+ leaf_delete_items(&bi, 0, item_pos, 1, -1);
+
+ if (!item_pos && tb->CFL[0]) {
+ if (B_NR_ITEMS(tbS0)) {
+ replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
+ } else {
+ if (!PATH_H_POSITION(tb->tb_path, 1))
+ replace_key(tb, tb->CFL[0], tb->lkey[0],
+ PATH_H_PPARENT(tb->tb_path, 0), 0);
+ }
+ }
+
+ RFALSE(!item_pos && !tb->CFL[0],
+ "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0],
+ tb->L[0]);
+}
+
+/* cut item in S[0] */
+static void balance_leaf_when_delete_cut(struct tree_balance *tb)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int item_pos = PATH_LAST_POSITION(tb->tb_path);
+ struct item_head *ih = item_head(tbS0, item_pos);
+ int pos_in_item = tb->tb_path->pos_in_item;
+ struct buffer_info bi;
+ buffer_info_init_tbS0(tb, &bi);
+
+ if (is_direntry_le_ih(ih)) {
+ /*
+ * UFS unlink semantics are such that you can only
+ * delete one directory entry at a time.
+ *
+ * when we cut a directory tb->insert_size[0] means
+ * number of entries to be cut (always 1)
+ */
+ tb->insert_size[0] = -1;
+ leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
+ -tb->insert_size[0]);
+
+ RFALSE(!item_pos && !pos_in_item && !tb->CFL[0],
+ "PAP-12030: can not change delimiting key. CFL[0]=%p",
+ tb->CFL[0]);
+
+ if (!item_pos && !pos_in_item && tb->CFL[0])
+ replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
+ } else {
+ leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
+ -tb->insert_size[0]);
+
+ RFALSE(!ih_item_len(ih),
+ "PAP-12035: cut must leave non-zero dynamic "
+ "length of item");
+ }
+}
+
+static int balance_leaf_when_delete_left(struct tree_balance *tb)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int n = B_NR_ITEMS(tbS0);
+
+ /* L[0] must be joined with S[0] */
+ if (tb->lnum[0] == -1) {
+ /* R[0] must be also joined with S[0] */
+ if (tb->rnum[0] == -1) {
+ if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
+ /*
+ * all contents of all the
+ * 3 buffers will be in L[0]
+ */
+ if (PATH_H_POSITION(tb->tb_path, 1) == 0 &&
+ 1 < B_NR_ITEMS(tb->FR[0]))
+ replace_key(tb, tb->CFL[0],
+ tb->lkey[0], tb->FR[0], 1);
+
+ leaf_move_items(LEAF_FROM_S_TO_L, tb, n, -1,
+ NULL);
+ leaf_move_items(LEAF_FROM_R_TO_L, tb,
+ B_NR_ITEMS(tb->R[0]), -1,
+ NULL);
+
+ reiserfs_invalidate_buffer(tb, tbS0);
+ reiserfs_invalidate_buffer(tb, tb->R[0]);
+
+ return 0;
+ }
+
+ /* all contents of all the 3 buffers will be in R[0] */
+ leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, NULL);
+ leaf_move_items(LEAF_FROM_L_TO_R, tb,
+ B_NR_ITEMS(tb->L[0]), -1, NULL);
+
+ /* right_delimiting_key is correct in R[0] */
+ replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
+
+ reiserfs_invalidate_buffer(tb, tbS0);
+ reiserfs_invalidate_buffer(tb, tb->L[0]);
+
+ return -1;
+ }
+
+ RFALSE(tb->rnum[0] != 0,
+ "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]);
+ /* all contents of L[0] and S[0] will be in L[0] */
+ leaf_shift_left(tb, n, -1);
+
+ reiserfs_invalidate_buffer(tb, tbS0);
+
+ return 0;
+ }
+
+ /*
+ * a part of contents of S[0] will be in L[0] and
+ * the rest part of S[0] will be in R[0]
+ */
+
+ RFALSE((tb->lnum[0] + tb->rnum[0] < n) ||
+ (tb->lnum[0] + tb->rnum[0] > n + 1),
+ "PAP-12050: rnum(%d) and lnum(%d) and item "
+ "number(%d) in S[0] are not consistent",
+ tb->rnum[0], tb->lnum[0], n);
+ RFALSE((tb->lnum[0] + tb->rnum[0] == n) &&
+ (tb->lbytes != -1 || tb->rbytes != -1),
+ "PAP-12055: bad rbytes (%d)/lbytes (%d) "
+ "parameters when items are not split",
+ tb->rbytes, tb->lbytes);
+ RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) &&
+ (tb->lbytes < 1 || tb->rbytes != -1),
+ "PAP-12060: bad rbytes (%d)/lbytes (%d) "
+ "parameters when items are split",
+ tb->rbytes, tb->lbytes);
+
+ leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
+ leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
+
+ reiserfs_invalidate_buffer(tb, tbS0);
+
+ return 0;
+}
+
/*
* Balance leaf node in case of delete or cut: insert_size[0] < 0
*
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
int item_pos = PATH_LAST_POSITION(tb->tb_path);
- int pos_in_item = tb->tb_path->pos_in_item;
struct buffer_info bi;
int n;
struct item_head *ih;
/* Delete or truncate the item */
- switch (flag) {
- case M_DELETE: /* delete item in S[0] */
-
- RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0],
- "vs-12013: mode Delete, insert size %d, ih to be deleted %h",
- -tb->insert_size[0], ih);
-
- leaf_delete_items(&bi, 0, item_pos, 1, -1);
-
- if (!item_pos && tb->CFL[0]) {
- if (B_NR_ITEMS(tbS0)) {
- replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0,
- 0);
- } else {
- if (!PATH_H_POSITION(tb->tb_path, 1))
- replace_key(tb, tb->CFL[0], tb->lkey[0],
- PATH_H_PPARENT(tb->tb_path,
- 0), 0);
- }
- }
-
- RFALSE(!item_pos && !tb->CFL[0],
- "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0],
- tb->L[0]);
+ BUG_ON(flag != M_DELETE && flag != M_CUT);
+ if (flag == M_DELETE)
+ balance_leaf_when_delete_del(tb);
+ else /* M_CUT */
+ balance_leaf_when_delete_cut(tb);
- break;
-
- case M_CUT:{ /* cut item in S[0] */
- if (is_direntry_le_ih(ih)) {
-
- /*
- * UFS unlink semantics are such that you
- * can only delete one directory entry at
- * a time.
- */
-
- /*
- * when we cut a directory tb->insert_size[0]
- * means number of entries to be cut (always 1)
- */
- tb->insert_size[0] = -1;
- leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
- -tb->insert_size[0]);
-
- RFALSE(!item_pos && !pos_in_item && !tb->CFL[0],
- "PAP-12030: can not change delimiting key. CFL[0]=%p",
- tb->CFL[0]);
-
- if (!item_pos && !pos_in_item && tb->CFL[0]) {
- replace_key(tb, tb->CFL[0], tb->lkey[0],
- tbS0, 0);
- }
- } else {
- leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
- -tb->insert_size[0]);
-
- RFALSE(!ih_item_len(ih),
- "PAP-12035: cut must leave non-zero dynamic length of item");
- }
- break;
- }
-
- default:
- print_cur_tb("12040");
- reiserfs_panic(tb->tb_sb, "PAP-12040",
- "unexpected mode: %s(%d)",
- (flag ==
- M_PASTE) ? "PASTE" : ((flag ==
- M_INSERT) ? "INSERT" :
- "UNKNOWN"), flag);
- }
/*
* the rule is that no shifting occurs unless by shifting
* a node can be freed
*/
n = B_NR_ITEMS(tbS0);
- /* L[0] takes part in balancing */
- if (tb->lnum[0]) {
- /* L[0] must be joined with S[0] */
- if (tb->lnum[0] == -1) {
- /* R[0] must be also joined with S[0] */
- if (tb->rnum[0] == -1) {
- if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
- /*
- * all contents of all the 3 buffers
- * will be in L[0]
- */
- if (PATH_H_POSITION(tb->tb_path, 1) == 0
- && 1 < B_NR_ITEMS(tb->FR[0]))
- replace_key(tb, tb->CFL[0],
- tb->lkey[0],
- tb->FR[0], 1);
-
- leaf_move_items(LEAF_FROM_S_TO_L, tb, n,
- -1, NULL);
- leaf_move_items(LEAF_FROM_R_TO_L, tb,
- B_NR_ITEMS(tb->R[0]),
- -1, NULL);
-
- reiserfs_invalidate_buffer(tb, tbS0);
- reiserfs_invalidate_buffer(tb,
- tb->R[0]);
-
- return 0;
- }
- /*
- * all contents of all the 3 buffers will
- * be in R[0]
- */
- leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1,
- NULL);
- leaf_move_items(LEAF_FROM_L_TO_R, tb,
- B_NR_ITEMS(tb->L[0]), -1, NULL);
- /* right_delimiting_key is correct in R[0] */
- replace_key(tb, tb->CFR[0], tb->rkey[0],
- tb->R[0], 0);
- reiserfs_invalidate_buffer(tb, tbS0);
- reiserfs_invalidate_buffer(tb, tb->L[0]);
-
- return -1;
- }
-
- RFALSE(tb->rnum[0] != 0,
- "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]);
- /* all contents of L[0] and S[0] will be in L[0] */
- leaf_shift_left(tb, n, -1);
-
- reiserfs_invalidate_buffer(tb, tbS0);
-
- return 0;
- }
-
- /*
- * a part of contents of S[0] will be in L[0] and the
- * rest part of S[0] will be in R[0]
- */
-
- RFALSE((tb->lnum[0] + tb->rnum[0] < n) ||
- (tb->lnum[0] + tb->rnum[0] > n + 1),
- "PAP-12050: rnum(%d) and lnum(%d) and item number(%d) in S[0] are not consistent",
- tb->rnum[0], tb->lnum[0], n);
- RFALSE((tb->lnum[0] + tb->rnum[0] == n) &&
- (tb->lbytes != -1 || tb->rbytes != -1),
- "PAP-12055: bad rbytes (%d)/lbytes (%d) parameters when items are not split",
- tb->rbytes, tb->lbytes);
- RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) &&
- (tb->lbytes < 1 || tb->rbytes != -1),
- "PAP-12060: bad rbytes (%d)/lbytes (%d) parameters when items are split",
- tb->rbytes, tb->lbytes);
-
- leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
- leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
-
- reiserfs_invalidate_buffer(tb, tbS0);
-
- return 0;
- }
+ /* L[0] takes part in balancing */
+ if (tb->lnum[0])
+ return balance_leaf_when_delete_left(tb);
if (tb->rnum[0] == -1) {
/* all contents of R[0] and S[0] will be in R[0] */
|| buffer_journal_dirty(tb->S_new[i])
|| buffer_dirty(tb->S_new[i]),
"PAP-12247: S_new[%d] : (%b)",
- i, format_bh(tb->S_new[i]));
+ i, tb->S_new[i]);
}
}
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
- buffer_info_init_tbS0(tb, &bi);
- leaf_insert_into_buf(&bi, tb->item_pos, ih,
- body, tb->zeroes_num);
-
- /*
- * If we insert the first key
- * change the delimiting key
- */
- if (tb->item_pos == 0) {
- if (tb->CFL[0]) /* can be 0 in reiserfsck */
- replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
- }
+ buffer_info_init_tbS0(tb, &bi);
+ leaf_insert_into_buf(&bi, tb->item_pos, ih, body, tb->zeroes_num);
+
+ /* If we insert the first key change the delimiting key */
+ if (tb->item_pos == 0) {
+ if (tb->CFL[0]) /* can be 0 in reiserfsck */
+ replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
+
+ }
+}
+
+static void balance_leaf_finish_node_paste_dirent(struct tree_balance *tb,
+ struct item_head *ih,
+ const char *body)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ struct item_head *pasted = item_head(tbS0, tb->item_pos);
+ struct buffer_info bi;
+
+ if (tb->pos_in_item >= 0 && tb->pos_in_item <= ih_entry_count(pasted)) {
+ RFALSE(!tb->insert_size[0],
+ "PAP-12260: insert_size is 0 already");
+
+ /* prepare space */
+ buffer_info_init_tbS0(tb, &bi);
+ leaf_paste_in_buffer(&bi, tb->item_pos, tb->pos_in_item,
+ tb->insert_size[0], body, tb->zeroes_num);
+
+ /* paste entry */
+ leaf_paste_entries(&bi, tb->item_pos, tb->pos_in_item, 1,
+ (struct reiserfs_de_head *)body,
+ body + DEH_SIZE, tb->insert_size[0]);
+
+ if (!tb->item_pos && !tb->pos_in_item) {
+ RFALSE(!tb->CFL[0] || !tb->L[0],
+ "PAP-12270: CFL[0]/L[0] must be specified");
+ if (tb->CFL[0])
+ replace_key(tb, tb->CFL[0], tb->lkey[0],
+ tbS0, 0);
+ }
+
+ tb->insert_size[0] = 0;
+ }
}
static void balance_leaf_finish_node_paste(struct tree_balance *tb,
{
struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
struct buffer_info bi;
- struct item_head *pasted;
-
- pasted = item_head(tbS0, tb->item_pos);
- /* when directory, may be new entry already pasted */
- if (is_direntry_le_ih(pasted)) {
- if (tb->pos_in_item >= 0 && tb->pos_in_item <= ih_entry_count(pasted)) {
-
- RFALSE(!tb->insert_size[0],
- "PAP-12260: insert_size is 0 already");
-
- /* prepare space */
- buffer_info_init_tbS0(tb, &bi);
- leaf_paste_in_buffer(&bi, tb->item_pos, tb->pos_in_item,
- tb->insert_size[0], body,
- tb->zeroes_num);
-
- /* paste entry */
- leaf_paste_entries(&bi, tb->item_pos, tb->pos_in_item, 1,
- (struct reiserfs_de_head *)body,
- body + DEH_SIZE,
- tb->insert_size[0]);
- if (!tb->item_pos && !tb->pos_in_item) {
- RFALSE(!tb->CFL[0] || !tb->L[0],
- "PAP-12270: CFL[0]/L[0] must be specified");
- if (tb->CFL[0])
- replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
- }
- tb->insert_size[0] = 0;
- }
- } else { /* regular object */
- if (tb->pos_in_item == ih_item_len(pasted)) {
-
- RFALSE(tb->insert_size[0] <= 0,
- "PAP-12275: insert size must not be %d",
- tb->insert_size[0]);
- buffer_info_init_tbS0(tb, &bi);
- leaf_paste_in_buffer(&bi, tb->item_pos, tb->pos_in_item,
- tb->insert_size[0], body, tb->zeroes_num);
-
- if (is_indirect_le_ih(pasted)) {
-#if 0
- RFALSE(tb->
- insert_size[0] !=
- UNFM_P_SIZE,
- "PAP-12280: insert_size for indirect item must be %d, not %d",
- UNFM_P_SIZE,
- tb->
- insert_size[0]);
-#endif
- set_ih_free_space(pasted, 0);
- }
- tb->insert_size[0] = 0;
- }
+ struct item_head *pasted = item_head(tbS0, tb->item_pos);
+
+ /* when directory, may be new entry already pasted */
+ if (is_direntry_le_ih(pasted)) {
+ balance_leaf_finish_node_paste_dirent(tb, ih, body);
+ return;
+ }
+
+ /* regular object */
+
+ if (tb->pos_in_item == ih_item_len(pasted)) {
+ RFALSE(tb->insert_size[0] <= 0,
+ "PAP-12275: insert size must not be %d",
+ tb->insert_size[0]);
+ buffer_info_init_tbS0(tb, &bi);
+ leaf_paste_in_buffer(&bi, tb->item_pos,
+ tb->pos_in_item, tb->insert_size[0], body,
+ tb->zeroes_num);
+
+ if (is_indirect_le_ih(pasted))
+ set_ih_free_space(pasted, 0);
+
+ tb->insert_size[0] = 0;
+ }
#ifdef CONFIG_REISERFS_CHECK
- else {
- if (tb->insert_size[0]) {
- print_cur_tb("12285");
- reiserfs_panic(tb->tb_sb,
- "PAP-12285",
- "insert_size "
- "must be 0 "
- "(%d)",
- tb->insert_size[0]);
- }
- }
-#endif /* CONFIG_REISERFS_CHECK */
-
- }
+ else if (tb->insert_size[0]) {
+ print_cur_tb("12285");
+ reiserfs_panic(tb->tb_sb, "PAP-12285",
+ "insert_size must be 0 (%d)", tb->insert_size[0]);
+ }
+#endif
}
/*
/* Balance internal level of the tree. */
for (h = 1; h < MAX_HEIGHT && tb->insert_size[h]; h++)
- child_pos =
- balance_internal(tb, h, child_pos, insert_key, insert_ptr);
+ child_pos = balance_internal(tb, h, child_pos, insert_key,
+ insert_ptr);
do_balance_completed(tb);
-
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff