reiserfs: balance_leaf refactor, format balance_leaf_paste_left
Break up balance_leaf_paste_left into:
balance_leaf_paste_left_shift
balance_leaf_paste_left_shift_dirent
balance_leaf_paste_left_whole
and keep balance_leaf_paste_left as a handler to select which is appropriate.
Also reformat to adhere to CodingStyle.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/reiserfs/do_balan.c b/fs/reiserfs/do_balan.c
index cca685d..843c402 100644
--- a/fs/reiserfs/do_balan.c
+++ b/fs/reiserfs/do_balan.c
@@ -355,164 +355,247 @@
}
}
+static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb,
+ struct item_head *ih,
+ const char *body)
+{
+ int n = B_NR_ITEMS(tb->L[0]);
+ struct buffer_info bi;
+
+ RFALSE(tb->zeroes_num,
+ "PAP-12090: invalid parameter in case of a directory");
+
+ /* directory item */
+ if (tb->lbytes > tb->pos_in_item) {
+ /* new directory entry falls into L[0] */
+ struct item_head *pasted;
+ int ret, l_pos_in_item = tb->pos_in_item;
+
+ /*
+ * Shift lnum[0] - 1 items in whole.
+ * Shift lbytes - 1 entries from given directory item
+ */
+ ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1);
+ if (ret && !tb->item_pos) {
+ pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
+ l_pos_in_item += ih_entry_count(pasted) -
+ (tb->lbytes - 1);
+ }
+
+ /* Append given directory entry to directory item */
+ buffer_info_init_left(tb, &bi);
+ leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
+ l_pos_in_item, tb->insert_size[0],
+ body, tb->zeroes_num);
+
+ /*
+ * previous string prepared space for pasting new entry,
+ * following string pastes this entry
+ */
+
+ /*
+ * when we have merge directory item, pos_in_item
+ * has been changed too
+ */
+
+ /* paste new directory entry. 1 is entry number */
+ leaf_paste_entries(&bi, n + tb->item_pos - ret,
+ l_pos_in_item, 1,
+ (struct reiserfs_de_head *) body,
+ body + DEH_SIZE, tb->insert_size[0]);
+ tb->insert_size[0] = 0;
+ } else {
+ /* new directory item doesn't fall into L[0] */
+ /*
+ * Shift lnum[0]-1 items in whole. Shift lbytes
+ * directory entries from directory item number lnum[0]
+ */
+ leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
+ }
+
+ /* Calculate new position to append in item body */
+ tb->pos_in_item -= tb->lbytes;
+}
+
+static void balance_leaf_paste_left_shift(struct tree_balance *tb,
+ struct item_head *ih,
+ const char *body)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int n = B_NR_ITEMS(tb->L[0]);
+ struct buffer_info bi;
+
+ if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
+ balance_leaf_paste_left_shift_dirent(tb, ih, body);
+ return;
+ }
+
+ RFALSE(tb->lbytes <= 0,
+ "PAP-12095: there is nothing to shift to L[0]. "
+ "lbytes=%d", tb->lbytes);
+ RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
+ "PAP-12100: incorrect position to paste: "
+ "item_len=%d, pos_in_item=%d",
+ ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
+
+ /* appended item will be in L[0] in whole */
+ if (tb->lbytes >= tb->pos_in_item) {
+ struct item_head *tbS0_pos_ih, *tbL0_ih;
+ struct item_head *tbS0_0_ih;
+ struct reiserfs_key *left_delim_key;
+ int ret, l_n, version, temp_l;
+
+ tbS0_pos_ih = item_head(tbS0, tb->item_pos);
+ tbS0_0_ih = item_head(tbS0, 0);
+
+ /*
+ * this bytes number must be appended
+ * to the last item of L[h]
+ */
+ l_n = tb->lbytes - tb->pos_in_item;
+
+ /* Calculate new insert_size[0] */
+ tb->insert_size[0] -= l_n;
+
+ RFALSE(tb->insert_size[0] <= 0,
+ "PAP-12105: there is nothing to paste into "
+ "L[0]. insert_size=%d", tb->insert_size[0]);
+
+ ret = leaf_shift_left(tb, tb->lnum[0],
+ ih_item_len(tbS0_pos_ih));
+
+ tbL0_ih = item_head(tb->L[0], n + tb->item_pos - ret);
+
+ /* Append to body of item in L[0] */
+ buffer_info_init_left(tb, &bi);
+ leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
+ ih_item_len(tbL0_ih), l_n, body,
+ min_t(int, l_n, tb->zeroes_num));
+
+ /*
+ * 0-th item in S0 can be only of DIRECT type
+ * when l_n != 0
+ */
+ temp_l = l_n;
+
+ RFALSE(ih_item_len(tbS0_0_ih),
+ "PAP-12106: item length must be 0");
+ RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
+ leaf_key(tb->L[0], n + tb->item_pos - ret)),
+ "PAP-12107: items must be of the same file");
+
+ if (is_indirect_le_ih(tbL0_ih)) {
+ int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
+ temp_l = l_n << shift;
+ }
+ /* update key of first item in S0 */
+ version = ih_version(tbS0_0_ih);
+ add_le_key_k_offset(version, &tbS0_0_ih->ih_key, temp_l);
+
+ /* update left delimiting key */
+ left_delim_key = internal_key(tb->CFL[0], tb->lkey[0]);
+ add_le_key_k_offset(version, left_delim_key, temp_l);
+
+ /*
+ * Calculate new body, position in item and
+ * insert_size[0]
+ */
+ if (l_n > tb->zeroes_num) {
+ body += (l_n - tb->zeroes_num);
+ tb->zeroes_num = 0;
+ } else
+ tb->zeroes_num -= l_n;
+ tb->pos_in_item = 0;
+
+ RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
+ leaf_key(tb->L[0],
+ B_NR_ITEMS(tb->L[0]) - 1)) ||
+ !op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size) ||
+ !op_is_left_mergeable(left_delim_key, tbS0->b_size),
+ "PAP-12120: item must be merge-able with left "
+ "neighboring item");
+ } else {
+ /* only part of the appended item will be in L[0] */
+
+ /* Calculate position in item for append in S[0] */
+ tb->pos_in_item -= tb->lbytes;
+
+ RFALSE(tb->pos_in_item <= 0,
+ "PAP-12125: no place for paste. pos_in_item=%d",
+ tb->pos_in_item);
+
+ /*
+ * Shift lnum[0] - 1 items in whole.
+ * Shift lbytes - 1 byte from item number lnum[0]
+ */
+ leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
+ }
+}
+
+
+/* appended item will be in L[0] in whole */
+static void balance_leaf_paste_left_whole(struct tree_balance *tb,
+ struct item_head *ih,
+ const char *body)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int n = B_NR_ITEMS(tb->L[0]);
+ struct buffer_info bi;
+ struct item_head *pasted;
+ int ret;
+
+ /* if we paste into first item of S[0] and it is left mergable */
+ if (!tb->item_pos &&
+ op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) {
+ /*
+ * then increment pos_in_item by the size of the
+ * last item in L[0]
+ */
+ pasted = item_head(tb->L[0], n - 1);
+ if (is_direntry_le_ih(pasted))
+ tb->pos_in_item += ih_entry_count(pasted);
+ else
+ tb->pos_in_item += ih_item_len(pasted);
+ }
+
+ /*
+ * Shift lnum[0] - 1 items in whole.
+ * Shift lbytes - 1 byte from item number lnum[0]
+ */
+ ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
+
+ /* Append to body of item in L[0] */
+ buffer_info_init_left(tb, &bi);
+ leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, tb->pos_in_item,
+ tb->insert_size[0], body, tb->zeroes_num);
+
+ /* if appended item is directory, paste entry */
+ pasted = item_head(tb->L[0], n + tb->item_pos - ret);
+ if (is_direntry_le_ih(pasted))
+ leaf_paste_entries(&bi, n + tb->item_pos - ret,
+ tb->pos_in_item, 1,
+ (struct reiserfs_de_head *)body,
+ body + DEH_SIZE, tb->insert_size[0]);
+
+ /*
+ * if appended item is indirect item, put unformatted node
+ * into un list
+ */
+ if (is_indirect_le_ih(pasted))
+ set_ih_free_space(pasted, 0);
+
+ tb->insert_size[0] = 0;
+ tb->zeroes_num = 0;
+}
+
static void balance_leaf_paste_left(struct tree_balance *tb,
struct item_head *ih, const char *body)
{
- struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
- int ret_val;
- struct buffer_info bi;
- int n = B_NR_ITEMS(tb->L[0]);
-
- if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
- /* we must shift the part of the appended item */
- if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
-
- RFALSE(tb->zeroes_num,
- "PAP-12090: invalid parameter in case of a directory");
- /* directory item */
- if (tb->lbytes > tb->pos_in_item) {
- /* new directory entry falls into L[0] */
- struct item_head *pasted;
- int l_pos_in_item = tb->pos_in_item;
-
- /* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 entries from given directory item */
- ret_val = leaf_shift_left(tb, tb->lnum[0], tb->lbytes-1);
- if (ret_val && !tb->item_pos) {
- pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
- l_pos_in_item += ih_entry_count(pasted) - (tb->lbytes -1);
- }
-
- /* Append given directory entry to directory item */
- buffer_info_init_left(tb, &bi);
- leaf_paste_in_buffer(&bi, n + tb->item_pos - ret_val, l_pos_in_item, tb->insert_size[0], body, tb->zeroes_num);
-
- /* previous string prepared space for pasting new entry, following string pastes this entry */
-
- /* when we have merge directory item, pos_in_item has been changed too */
-
- /* paste new directory entry. 1 is entry number */
- leaf_paste_entries(&bi, n + tb->item_pos - ret_val, l_pos_in_item,
- 1, (struct reiserfs_de_head *) body,
- body + DEH_SIZE, tb->insert_size[0]);
- tb->insert_size[0] = 0;
- } else {
- /* new directory item doesn't fall into L[0] */
- /* Shift lnum[0]-1 items in whole. Shift lbytes directory entries from directory item number lnum[0] */
- leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
- }
- /* Calculate new position to append in item body */
- tb->pos_in_item -= tb->lbytes;
- } else {
- /* regular object */
- RFALSE(tb->lbytes <= 0, "PAP-12095: there is nothing to shift to L[0]. lbytes=%d", tb->lbytes);
- RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
- "PAP-12100: incorrect position to paste: item_len=%d, pos_in_item=%d",
- ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
-
- if (tb->lbytes >= tb->pos_in_item) {
- /* appended item will be in L[0] in whole */
- int l_n;
-
- /* this bytes number must be appended to the last item of L[h] */
- l_n = tb->lbytes - tb->pos_in_item;
-
- /* Calculate new insert_size[0] */
- tb->insert_size[0] -= l_n;
-
- RFALSE(tb->insert_size[0] <= 0,
- "PAP-12105: there is nothing to paste into L[0]. insert_size=%d",
- tb->insert_size[0]);
- ret_val = leaf_shift_left(tb, tb->lnum[0], ih_item_len
- (item_head(tbS0, tb->item_pos)));
- /* Append to body of item in L[0] */
- buffer_info_init_left(tb, &bi);
- leaf_paste_in_buffer
- (&bi, n + tb->item_pos - ret_val, ih_item_len
- (item_head(tb->L[0], n + tb->item_pos - ret_val)),
- l_n, body,
- tb->zeroes_num > l_n ? l_n : tb->zeroes_num);
- /* 0-th item in S0 can be only of DIRECT type when l_n != 0 */
- {
- int version;
- int temp_l = l_n;
-
- RFALSE(ih_item_len(item_head(tbS0, 0)),
- "PAP-12106: item length must be 0");
- RFALSE(comp_short_le_keys(leaf_key(tbS0, 0), leaf_key
- (tb->L[0], n + tb->item_pos - ret_val)),
- "PAP-12107: items must be of the same file");
- if (is_indirect_le_ih(item_head(tb->L[0], n + tb->item_pos - ret_val))) {
- temp_l = l_n << (tb->tb_sb-> s_blocksize_bits - UNFM_P_SHIFT);
- }
- /* update key of first item in S0 */
- version = ih_version(item_head(tbS0, 0));
- set_le_key_k_offset(version, leaf_key(tbS0, 0),
- le_key_k_offset(version,leaf_key(tbS0, 0)) + temp_l);
- /* update left delimiting key */
- set_le_key_k_offset(version, internal_key(tb->CFL[0], tb->lkey[0]),
- le_key_k_offset(version, internal_key(tb->CFL[0], tb->lkey[0])) + temp_l);
- }
-
- /* Calculate new body, position in item and insert_size[0] */
- if (l_n > tb->zeroes_num) {
- body += (l_n - tb->zeroes_num);
- tb->zeroes_num = 0;
- } else
- tb->zeroes_num -= l_n;
- tb->pos_in_item = 0;
-
- RFALSE(comp_short_le_keys(leaf_key(tbS0, 0), leaf_key(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1))
- || !op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)
- || !op_is_left_mergeable(internal_key(tb->CFL[0], tb->lkey[0]), tbS0->b_size),
- "PAP-12120: item must be merge-able with left neighboring item");
- } else { /* only part of the appended item will be in L[0] */
-
- /* Calculate position in item for append in S[0] */
- tb->pos_in_item -= tb->lbytes;
-
- RFALSE(tb->pos_in_item <= 0, "PAP-12125: no place for paste. pos_in_item=%d", tb->pos_in_item);
-
- /* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */
- leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
- }
- }
- } else { /* appended item will be in L[0] in whole */
-
- struct item_head *pasted;
-
- if (!tb->item_pos && op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) { /* if we paste into first item of S[0] and it is left mergable */
- /* then increment pos_in_item by the size of the last item in L[0] */
- pasted = item_head(tb->L[0], n - 1);
- if (is_direntry_le_ih(pasted))
- tb->pos_in_item += ih_entry_count(pasted);
- else
- tb->pos_in_item += ih_item_len(pasted);
- }
-
- /* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */
- ret_val = leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
- /* Append to body of item in L[0] */
- buffer_info_init_left(tb, &bi);
- leaf_paste_in_buffer(&bi, n + tb->item_pos - ret_val,
- tb->pos_in_item,
- tb->insert_size[0],
- body, tb->zeroes_num);
-
- /* if appended item is directory, paste entry */
- pasted = item_head(tb->L[0], n + tb->item_pos - ret_val);
- if (is_direntry_le_ih(pasted))
- leaf_paste_entries(&bi, n + tb->item_pos - ret_val,
- tb->pos_in_item, 1,
- (struct reiserfs_de_head *) body,
- body + DEH_SIZE,
- tb->insert_size[0]);
- /* if appended item is indirect item, put unformatted node into un list */
- if (is_indirect_le_ih(pasted))
- set_ih_free_space(pasted, 0);
- tb->insert_size[0] = 0;
- tb->zeroes_num = 0;
- }
-
+ /* we must shift the part of the appended item */
+ if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1)
+ balance_leaf_paste_left_shift(tb, ih, body);
+ else
+ balance_leaf_paste_left_whole(tb, ih, body);
}
/* Shift lnum[0] items from S[0] to the left neighbor L[0] */