This commit contains the basic code related to the new inode tree
including the common/helper functions, tree initialisation, and
a few functions for debugging.
Signed-off-by: Radek Pazdera <rpazdera@xxxxxxxxxx>
---
fs/ext4/namei.c | 729 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 729 insertions(+)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index c9b6c91..1f9ea5b 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -311,6 +311,49 @@ struct itree_frame {
struct itree_entry *at;
};
+/*
+ * The depth of the tree is limited for convenience, so we can allocate
+ * itree_frames statically on the stack.
+ *
+ * With three levels, the tree can take around 12 millions of entries
+ * in the worst case scenario of 255 characters per file name and each
+ * node of the tree only half-full. In a much more likely case of 20B
+ * per name and 75% average fullness, the tree capacity is roughly 0.5
+ * billion of entries.
+ *
+ * In case those limits are exceeded, the capacity of the tree can be
+ * increased by incrementing this constant.
+ */
+#define ITREE_MAX_DEPTH 3
+
+static int itree_init(handle_t *handle, struct inode *dir,
+ struct dx_hash_info *hinfo,
+ struct ext4_dir_entry_2 *dirents,
+ struct dentry *entry, struct inode *inode,
+ ext4_fsblk_t *root_block);
+
+static int itree_next_frame(struct inode *dir, u32 ino,
+ struct itree_frame *frames,
+ struct itree_frame *frame_in,
+ int allways);
+
+#define itree_leaf_for_each(le, de, head, blocksize) \
+ for (le = ((void *)head + sizeof(struct itree_leaf_head)), \
+ de = &(le->dirent); \
+ le < (struct itree_leaf_entry *)((void *)head + blocksize); \
+ le = itree_next_leaf_entry(le, blocksize), de = &(le->dirent))
+
+#define ITREE_DEBUG__
+#ifdef ITREE_DEBUG
+#define itree_debug(command) command
+static void itree_show_node(struct buffer_head *bh);
+static void itree_show_leaf(struct inode *dir, struct buffer_head *bh,
+ ext4_fsblk_t *block);
+static void itree_show(struct inode *dir, ext4_fsblk_t block);
+#else
+#define itree_debug(command)
+#endif
+
static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
static inline unsigned dx_get_hash(struct dx_entry *entry);
@@ -3391,3 +3434,689 @@ const struct inode_operations ext4_special_inode_operations = {
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
};
+
+/*
+ * TODO Add BUFFER_TRACEs where they should be
+ */
+
+static unsigned get_itree_node_limit(int blocksize)
+{
+ unsigned space = blocksize - sizeof(struct itree_node);
+ return space / sizeof(struct itree_entry);
+}
+
+static void ext4_free_itree_block(handle_t *handle, struct inode *inode,
+ ext4_fsblk_t block)
+{
+ int flags = EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
+ ext4_free_blocks(handle, inode, NULL, block, 1, flags);
+}
+
+static struct itree_leaf_head *itree_leaf_get_head(struct buffer_head *leaf)
+{
+ return (struct itree_leaf_head *)leaf->b_data;
+}
+
+static struct itree_leaf_entry *itree_leaf_get_entries(struct buffer_head *leaf)
+{
+ void *entries = (void *)leaf->b_data + sizeof(struct itree_leaf_head);
+ return (struct itree_leaf_entry *)entries;
+}
+
+static void itree_entry_get_key(struct itree_entry *entry,
+ struct itree_key *key)
+{
+ key->inode = le32_to_cpu(entry->inode);
+ key->hash = le32_to_cpu(entry->hash);
+}
+
+static void itree_leaf_entry_get_key(struct itree_leaf_entry *entry,
+ struct itree_key *key)
+{
+ key->inode = le32_to_cpu(entry->dirent.inode);
+ key->hash = le32_to_cpu(entry->hash);
+}
+
+static int itree_key_compare(struct itree_key *one, struct itree_key *two)
+{
+ if (one->inode < two->inode)
+ return -1;
+ if (one->inode > two->inode)
+ return 1;
+
+ if (one->hash < two->hash)
+ return -1;
+ if (one->hash > two->hash)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Returned buffer is locked. The caller is expected to mark it
+ * uptodate and unlock it after it is initialized.
+ */
+static struct buffer_head *ext4_new_itree_block(handle_t *handle,
+ struct inode *inode,
+ ext4_fsblk_t *block, int *err)
+{
+ struct buffer_head *bh;
+ ext4_fsblk_t new_blk;
+
+ new_blk = ext4_new_meta_blocks(handle, inode,
+ ext4_inode_to_goal_block(inode),
+ EXT4_MB_HINT_METADATA, NULL, err);
+ if (!new_blk)
+ return NULL;
+
+ bh = sb_getblk(inode->i_sb, new_blk);
+ if (!bh) {
+ *err = -ENOMEM;
+ goto fail;
+ }
+
+ lock_buffer(bh);
+
+ *err = ext4_journal_get_create_access(handle, bh);
+ if (*err) {
+ unlock_buffer(bh);
+ brelse(bh);
+ goto fail;
+ }
+
+ *block = new_blk;
+ return bh;
+
+fail:
+ ext4_free_itree_block(handle, inode, *block);
+ return NULL;
+}
+
+static u8 itree_get_fullness(int value, int value_max)
+{
+ int fullness = ((value * 255) / value_max) + 1;
+ return fullness > 255 ? 255 : fullness;
+}
+
+static u8 itree_get_leaf_fullness(struct itree_leaf_head *head, int blocksize)
+{
+ int value = le16_to_cpu(head->used_length);
+ int max = blocksize - sizeof(struct itree_leaf_head);
+
+ return itree_get_fullness(value, max);
+}
+
+static u8 itree_get_node_fullness(struct itree_node *node)
+{
+ int value = le16_to_cpu(node->count);
+ int max = le16_to_cpu(node->limit);
+
+ return itree_get_fullness(value, max);
+}
+
+static int itree_update_fullness(handle_t *handle, struct inode *dir,
+ struct itree_frame *frame, u8 fullness)
+{
+ struct buffer_head *bh = frame->bh;
+ struct itree_entry *entry = frame->at;
+ int err;
+
+ err = ext4_journal_get_write_access(handle, bh);
+ if (err)
+ return err;
+
+ entry->fullness = fullness;
+
+ err = ext4_handle_dirty_metadata(handle, dir, bh);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static struct itree_frame *itree_probe(struct itree_key *key, struct inode *dir,
+ ext4_fsblk_t itree_root_blk,
+ struct itree_frame *frame_in, int *err)
+{
+ struct itree_frame *frame = frame_in;
+ struct buffer_head *bh;
+ struct itree_node *node;
+ struct itree_entry *entries, *at, *p, *q, *m;
+ struct itree_key entry_key;
+ unsigned count, indirect;
+
+ bh = sb_bread(dir->i_sb, itree_root_blk);
+ if (!bh) {
+ *err = -EIO;
+ return NULL;
+ }
+
+ /* TODO Verify checksum */
+
+ node = (struct itree_node *)bh->b_data;
+ if (node->indirect_levels >= ITREE_MAX_DEPTH) {
+ ext4_warning(dir->i_sb, "Too many levels in itree.");
+ return NULL;
+ }
+
+ while (1) {
+ frame->bh = NULL;
+ node = (struct itree_node *)bh->b_data;
+ entries = node->entries;
+ count = le16_to_cpu(node->count);
+ indirect = node->indirect_levels;
+
+ if (key->inode < le32_to_cpu(entries[0].inode)) {
+ at = entries;
+ } else {
+ p = entries;
+ q = entries + count - 1;
+ while (p <= q) {
+ m = p + (q - p)/2;
+ itree_entry_get_key(m, &entry_key);
+ if (itree_key_compare(&entry_key, key) > 0)
+ q = m - 1;
+ else
+ p = m + 1;
+ }
+ at = p - 1;
+ }
+
+ while ((at->flags & ITREE_NODE_FL_CONT) && at > entries &&
+ le32_to_cpu(at->inode) == key->inode)
+ at--;
+
+ frame->bh = bh;
+ frame->entries = entries;
+ frame->at = at;
+
+ if (!indirect--)
+ return frame;
+
+ bh = sb_bread(dir->i_sb, le64_to_cpu(at->block));
+ if (!bh)
+ goto fail;
+
+ frame++;
+ }
+
+ return frame;
+
+fail:
+ while (frame >= frame_in) {
+ brelse(frame->bh);
+ frame--;
+ }
+ return NULL;
+}
+
+/*
+ * frames must be an array of at least two
+ */
+static void itree_release_frames(struct itree_frame *frames)
+{
+ int n;
+
+ for (n = 0; n < ITREE_MAX_DEPTH; n++)
+ if (frames[n].bh)
+ brelse(frames[n].bh);
+}
+
+static unsigned itree_leaf_entry_len(unsigned rec_len)
+{
+ return rec_len + ITREE_LE_HEAD_LEN;
+}
+
+static unsigned itree_leaf_entry_min_len(struct itree_leaf_entry *le)
+{
+ return itree_leaf_entry_len(EXT4_DIR_REC_LEN(le->dirent.name_len));
+}
+
+static int itree_leaf_entry_get_len(struct itree_leaf_entry *le,
+ long int blocksize)
+{
+ return sizeof(((struct itree_leaf_entry *)0)->hash) +
+ ext4_rec_len_from_disk(le->dirent.rec_len, blocksize);
+}
+
+static struct itree_leaf_entry
+*itree_next_leaf_entry(struct itree_leaf_entry *le, long int blocksize)
+{
+ BUG_ON(!itree_leaf_entry_get_len(le, blocksize));
+
+ return (struct itree_leaf_entry *)((void *)le +
+ itree_leaf_entry_get_len(le, blocksize));
+}
+
+struct itree_leaf_map {
+ struct itree_leaf_head *head;
+
+ struct itree_leaf_entry *first;
+ struct itree_leaf_entry *last;
+ struct itree_leaf_entry *at;
+ struct itree_leaf_entry *free;
+
+ struct itree_leaf_entry *before_split;
+ struct itree_leaf_entry *split_at;
+
+ int used_length1;
+ int used_length2;
+};
+
+static void scan_sorted_buf(struct itree_key *key, struct dentry *dentry,
+ struct buffer_head *bh, int blocksize,
+ struct itree_leaf_map *leaf_map)
+{
+ struct itree_leaf_head *lh;
+ struct itree_leaf_entry *le, *prev = 0;
+ struct ext4_dir_entry_2 *de;
+ struct itree_key le_key;
+ int rlen, req_rlen, min_rlen, size = 0;
+ int bufsize, len;
+
+ memset(leaf_map, 0, sizeof(struct itree_leaf_map));
+
+ lh = leaf_map->head = itree_leaf_get_head(bh);
+
+ req_rlen = itree_leaf_entry_len(EXT4_DIR_REC_LEN(dentry->d_name.len));
+ bufsize = blocksize - sizeof(struct itree_leaf_head);
+
+ le = itree_leaf_get_entries(bh);
+ leaf_map->first = leaf_map->at = le;
+
+ itree_leaf_for_each(le, de, lh, blocksize) {
+ itree_leaf_entry_get_key(le, &le_key);
+
+ if (le_key.inode && itree_key_compare(&le_key, key) <= 0)
+ leaf_map->at = le;
+
+ /* Identify a split point in case we'll need to split */
+ if (!leaf_map->split_at) {
+ rlen = itree_leaf_entry_get_len(le, blocksize);
+ if (size + rlen/2 >= bufsize/2) {
+ leaf_map->before_split = leaf_map->last;
+ leaf_map->split_at = le;
+ }
+ size += rlen;
+ }
+
+ if (le_key.inode) {
+ len = itree_leaf_entry_min_len(le);
+ if (!leaf_map->split_at)
+ leaf_map->used_length1 += len;
+ else
+ leaf_map->used_length2 += len;
+ }
+
+ /* XXX Maybe search for the smallest available free space? */
+ if (!leaf_map->free) {
+ min_rlen = 0;
+ if (le_key.inode) /* inode != 0 */
+ min_rlen = EXT4_DIR_REC_LEN(de->name_len);
+
+ rlen = ext4_rec_len_from_disk(de->rec_len, blocksize);
+ if ((rlen - min_rlen) >= req_rlen)
+ leaf_map->free = le;
+ }
+
+ prev = leaf_map->last;
+ leaf_map->last = le;
+ }
+
+ /*
+ * When adding at end of the block, we're probably adding a
+ * continuous sequence of inodes. Make the split at the end
+ * of the block.
+ */
+ if (leaf_map->at == leaf_map->last) {
+ leaf_map->before_split = prev;
+ leaf_map->split_at = leaf_map->last;
+
+ len = itree_leaf_entry_min_len(leaf_map->last);
+ if (leaf_map->used_length2)
+ leaf_map->used_length1 += leaf_map->used_length2 - len;
+ leaf_map->used_length2 = len;
+ }
+}
+
+static int itree_next_frame(struct inode *dir, u32 ino,
+ struct itree_frame *frames,
+ struct itree_frame *frame_in,
+ int always)
+{
+ int count, levels_crossed = 0;
+ struct itree_frame *frame = frame_in;
+ struct buffer_head *bh;
+ struct itree_node *node;
+ struct itree_entry *node_end, *at = NULL;
+
+ while (frame >= frames) {
+ bh = frame->bh;
+ node = (struct itree_node *)bh->b_data;
+ count = le16_to_cpu(node->count);
+ node_end = &(frame->entries[count]);
+
+ at = frame->at + 1;
+ if (at < node_end)
+ break;
+
+ if (frame == frames)
+ return 1;
+
+ levels_crossed++;
+ frame--;
+ }
+
+ if (!always && (at->inode > ino ||
+ !(at->flags & ITREE_NODE_FL_CONT)))
+ return 1;
+
+ frame->at = at;
+
+ while (levels_crossed--) {
+ bh = sb_bread(dir->i_sb, le64_to_cpu(frame->at->block));
+ if (!bh)
+ return -EIO;
+
+ /* TODO: Checksum */
+
+ frame++;
+ brelse(frame->bh);
+ frame->bh = bh;
+ node = (struct itree_node *)bh->b_data;
+ frame->entries = node->entries;
+ frame->at = node->entries;
+ }
+ return 0;
+}
+
+/*
+ * Arrange the dirents to the two new itree blocks in the order
+ * specified by the map. Returns 1 in case the split occured within
+ * a collision, otherwise 0.
+ */
+static int itree_arrange_dirents(struct ext4_dir_entry_2 *dirents,
+ struct dx_hash_info *hinfo,
+ void *leaf1, void *leaf2, int blocksize)
+{
+ struct dx_map_entry *map, *split_point;
+ struct ext4_dir_entry_2 *de;
+ struct itree_leaf_head *head1, *head2;
+ struct itree_leaf_entry *entry = NULL;
+ unsigned split, rec_len = 0;
+ void *from, *to, *buf_end;
+ void *data1, *data2;
+ int size1 = 0, size2 = 0, *size = &size1;
+ int count, retval;
+
+ head1 = (struct itree_leaf_head *)leaf1;
+ head2 = (struct itree_leaf_head *)leaf2;
+
+ data1 = leaf1 + sizeof(struct itree_leaf_head);
+ data2 = leaf2 + sizeof(struct itree_leaf_head);
+
+ map = (struct dx_map_entry *)(leaf2 + blocksize);
+ count = dx_make_map(dirents, blocksize, hinfo, map);
+ map -= count;
+ dx_sort_map(inode_order, map, count);
+
+ split = dx_map_split_point(map, count, blocksize);
+ split_point = map + split;
+
+ /* Did we split a collision? */
+ retval = (map[split - 1].inode == map[split].inode) &&
+ (map[split - 1].hash == map[split].hash);
+
+ from = (void *)dirents;
+ to = data1;
+ while (count--) {
+ entry = (struct itree_leaf_entry *)to;
+ entry->hash = cpu_to_le32(map->hash);
+
+ de = (struct ext4_dir_entry_2 *)(from + (map->offs<<2));
+ rec_len = EXT4_DIR_REC_LEN(de->name_len);
+ memcpy(&(entry->dirent), de, rec_len);
+ entry->dirent.rec_len = ext4_rec_len_to_disk(rec_len,
+ blocksize);
+
+ /*FIXME sizeof(leaf_entry_head!!)*/
+ *size += (rec_len + sizeof(__u32));
+
+ if (++map == split_point) {
+ buf_end = leaf1 + blocksize;
+ rec_len = buf_end - (void *)(&entry->dirent);
+ entry->dirent.rec_len = ext4_rec_len_to_disk(rec_len,
+ blocksize);
+ to = data2;
+ size = &size2;
+ } else {
+ to = itree_next_leaf_entry(entry, blocksize);
+ }
+ }
+
+ head1->used_length = cpu_to_le16(size1);
+ head2->used_length = cpu_to_le16(size2);
+
+ buf_end = leaf2 + blocksize;
+ rec_len = buf_end - (void *)(&(entry->dirent));
+ entry->dirent.rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
+
+ return retval;
+}
+
+static int itree_init(handle_t *handle, struct inode *dir,
+ struct dx_hash_info *hinfo,
+ struct ext4_dir_entry_2 *dirents,
+ struct dentry *dentry, struct inode *inode,
+ ext4_fsblk_t *root_block)
+{
+ struct buffer_head *bh, *bh1, *bh2, *target_bh;
+ struct itree_leaf_head *head1, *head2;
+ ext4_fsblk_t leaf_blk1, leaf_blk2;
+ struct itree_node *root;
+ struct itree_key key2, key;
+ char *leaf1, *leaf2;
+ int err, blocksize, continued = 0;
+ struct itree_leaf_entry *le;
+ struct itree_leaf_map leaf_map;
+
+ blocksize = dir->i_sb->s_blocksize;
+
+ bh = ext4_new_itree_block(handle, dir, root_block, &err);
+ if (!bh)
+ goto out;
+
+ root = (struct itree_node *)(bh->b_data);
+ root->checksum = 0;
+ root->indirect_levels = 0;
+ root->count = 0;
+ root->limit = cpu_to_le16(get_itree_node_limit(blocksize));
+
+ /* Initialize the two dirent leaf blocks. */
+ bh1 = ext4_new_itree_block(handle, dir, &leaf_blk1, &err);
+ if (!bh1)
+ goto free_bh;
+ head1 = (struct itree_leaf_head *)bh1->b_data;
+ leaf1 = bh1->b_data;
+
+ bh2 = ext4_new_itree_block(handle, dir, &leaf_blk2, &err);
+ if (!bh2)
+ goto free_bh1;
+ head2 = (struct itree_leaf_head *)bh2->b_data;
+ leaf2 = bh2->b_data;
+
+ continued = itree_arrange_dirents(dirents, hinfo, leaf1, leaf2,
+ blocksize);
+
+ le = itree_leaf_get_entries(bh2);
+ itree_leaf_entry_get_key(le, &key2);
+
+ root->count = cpu_to_le16(2);
+ root->entries[0].inode = 0;
+ root->entries[0].hash = 0;
+ root->entries[0].block = cpu_to_le64(leaf_blk1);
+ root->entries[0].fullness = itree_get_leaf_fullness(head1, blocksize);
+ root->entries[0].flags = 0;
+
+ root->entries[1].inode = cpu_to_le32(key2.inode);
+ root->entries[1].hash = cpu_to_le32(key2.hash);
+ root->entries[1].block = cpu_to_le64(leaf_blk2);
+ root->entries[1].fullness = itree_get_leaf_fullness(head2, blocksize);
+ root->entries[1].flags = 0;
+
+ if (continued)
+ root->entries[1].flags |= ITREE_NODE_FL_CONT;
+
+ ext4fs_dirhash(dentry->d_name.name, dentry->d_name.len, hinfo);
+ key.inode = inode->i_ino;
+ key.hash = hinfo->hash;
+
+ /* Insert the new entry to itree */
+ target_bh = itree_key_compare(&key, &key2) <= 0 ? bh1 : bh2;
+
+ scan_sorted_buf(&key, dentry, target_bh, blocksize, &leaf_map);
+ put_entry_to_sorted_buf(&key, dentry, inode, target_bh, blocksize,
+ &leaf_map);
+
+ /* TODO: Set checksums */
+
+ set_buffer_uptodate(bh2);
+ unlock_buffer(bh2);
+ err = ext4_handle_dirty_metadata(handle, dir, bh2);
+ if (err)
+ goto free_bh1;
+ brelse(bh2);
+
+ set_buffer_uptodate(bh1);
+ unlock_buffer(bh1);
+ err = ext4_handle_dirty_metadata(handle, dir, bh1);
+ if (err)
+ goto free_bh;
+ brelse(bh1);
+
+ set_buffer_uptodate(bh);
+ unlock_buffer(bh);
+ err = ext4_handle_dirty_metadata(handle, dir, bh);
+ if (err)
+ goto out;
+ brelse(bh);
+
+ return 0;
+
+/*free_bh2:
+ unlock_buffer(bh2);
+ brelse(bh2);
+ ext4_free_itree_block(handle, dir, leaf_blk2);*/
+free_bh1:
+ unlock_buffer(bh1);
+ brelse(bh1);
+ ext4_free_itree_block(handle, dir, leaf_blk1);
+free_bh:
+ unlock_buffer(bh);
+ brelse(bh);
+ ext4_free_itree_block(handle, dir, *root_block);
+out:
+ return err;
+}
+
+#ifdef ITREE_DEBUG
+static void itree_show_node(struct buffer_head *bh)
+{
+ struct itree_node *node = (struct itree_node *)bh->b_data;
+ struct itree_entry *e;
+ int n = 0, i;
+
+ static const char * const indent[] = {" ", " ",
+ " "};
+ i = node->indirect_levels;
+ BUG_ON(i < 0 || i > 2);
+
+ printk(KERN_DEBUG
+ "%s[itree node] count=%u, limit=%u, indirect=%u, checksum=%u\n",
+ indent[i], le16_to_cpu(node->count), le16_to_cpu(node->limit),
+ node->indirect_levels, le32_to_cpu(node->checksum));
+
+ for (e = node->entries; e < (node->entries + node->count); e++)
+ printk(KERN_DEBUG "%s [%d] inode=%u, hash=%u, "
+ "block=%llu, flags=%x, fullness=%u\n", indent[i], n++,
+ le32_to_cpu(e->inode), le32_to_cpu(e->hash),
+ le64_to_cpu(e->block), e->flags, e->fullness);
+}
+
+static void itree_show_leaf(struct inode *dir, struct buffer_head *bh,
+ ext4_fsblk_t *block)
+{
+ int blocksize = dir->i_sb->s_blocksize;
+ struct ext4_dir_entry_2 *de;
+ struct itree_leaf_entry *le;
+ struct itree_leaf_head *lh;
+ int num_entries = 0;
+ int size = 0, req_size = 0;
+ u32 first_inode, last_inode = 0;
+
+ lh = (struct itree_leaf_head *)bh->b_data;
+ le = (struct itree_leaf_entry *)(lh + 1);
+ first_inode = le32_to_cpu(le->dirent.inode);
+
+ itree_leaf_for_each(le, de, lh, blocksize) {
+ size += itree_leaf_entry_get_len(le, blocksize);
+ req_size += itree_leaf_entry_min_len(le);
+
+ num_entries++;
+ last_inode = le32_to_cpu(de->inode);
+ }
+
+ if (block)
+ printk(KERN_DEBUG " [itree leaf@%llu] ", *block);
+ else
+ printk(KERN_DEBUG " [itree leaf] ");
+ printk(KERN_DEBUG "checksum(%u), first_ino(%u), last_ino(%u), "
+ "entries(%u), fullness(%d%%), used_length(%u)\n",
+ le32_to_cpu(lh->checksum), first_inode, last_inode, num_entries,
+ (req_size*100)/size, le16_to_cpu(lh->used_length));
+
+ if (0) { /* Print entries */
+ printk(KERN_DEBUG " entries: ");
+ itree_leaf_for_each(le, de, lh, blocksize) {
+ le = container_of(de, struct itree_leaf_entry, dirent);
+ printk(KERN_DEBUG "%u:%u(%u), ",
+ le32_to_cpu(de->inode), le32_to_cpu(le->hash),
+ ext4_rec_len_from_disk(de->rec_len, blocksize));
+ }
+ printk(KERN_DEBUG "\n");
+ }
+}
+
+static void itree_show(struct inode *dir, ext4_fsblk_t block)
+{
+ struct buffer_head *bh, *leaf;
+ struct itree_node *node;
+ struct itree_entry *e;
+ int level;
+ ext4_fsblk_t next;
+
+ bh = sb_bread(dir->i_sb, block);
+ if (!bh)
+ return;
+
+ itree_show_node(bh);
+
+ node = (struct itree_node *)bh->b_data;
+ level = le16_to_cpu(node->indirect_levels);
+
+ for (e = node->entries; e < (node->entries + node->count); e++) {
+ next = le64_to_cpu(e->block);
+ if (level) {
+ itree_show(dir, next);
+ } else {
+ leaf = sb_bread(dir->i_sb, next);
+ if (!leaf)
+ return;
+ itree_show_leaf(dir, leaf, &next);
+ brelse(leaf);
+ }
+
+ }
+ brelse(bh);
+}
+#endif
--
1.7.11.7
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