Changeset 5c83612b in mainline for uspace/lib/ext4/libext4_directory_index.c

Timestamp:

2012-02-18T12:51:36Z (12 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

a7d6185

Parents:

856a36b

Message:

adding directory entry using index tree (actually without splitting index block)

File:

• uspace/lib/ext4/libext4_directory_index.c (modified) (3 diffs)

uspace/lib/ext4/libext4_directory_index.c

@@ -38 +38 @@
 #include <byteorder.h>
 #include <errno.h>
+#include <string.h>
 #include "libext4.h"
 
@@ -451 +452 @@
 
 int ext4_directory_dx_add_entry(ext4_filesystem_t *fs,
-                ext4_inode_ref_t *parent, size_t name_size, const char *name)
-{
-        // TODO delete this command
-        return EXT4_ERR_BAD_DX_DIR;
-
-        EXT4FS_DBG("NOT REACHED");
-
+                ext4_inode_ref_t *parent, ext4_inode_ref_t *child,
+                size_t name_size, const char *name)
+{
         int rc;
 
@@ -489 +486 @@
         }
 
+
+        // Try to insert to existing data block
+        uint32_t leaf_block_idx = ext4_directory_dx_entry_get_block(dx_block->position);
+        uint32_t leaf_block_addr;
+        rc = ext4_filesystem_get_inode_data_block_index(fs, parent->inode, leaf_block_idx, &leaf_block_addr);
+        if (rc != EOK) {
+                return EXT4_ERR_BAD_DX_DIR;
+        }
+
+
+        block_t *target;
+        rc = block_get(&target, fs->device, leaf_block_addr, BLOCK_FLAGS_NONE);
+        if (rc != EOK) {
+                return EXT4_ERR_BAD_DX_DIR;
+        }
+
+        uint32_t block_size = ext4_superblock_get_block_size(fs->superblock);
+        uint16_t required_len = 8 + name_size + (4 - name_size % 4);
+
+        ext4_directory_entry_ll_t *de = target->data;
+        ext4_directory_entry_ll_t *stop = target->data + block_size;
+
+        EXT4FS_DBG("before while de = \%u, stop = \%u", (uint32_t)de, (uint32_t)stop);
+
+        while (de < stop) {
+
+                EXT4FS_DBG("before while de = \%u", (uint32_t)de);
+
+                uint32_t de_inode = ext4_directory_entry_ll_get_inode(de);
+                uint16_t de_rec_len = ext4_directory_entry_ll_get_entry_length(de);
+
+                if ((de_inode == 0) && (de_rec_len >= required_len)) {
+                        ext4_directory_write_entry(fs->superblock, de, de_rec_len,
+                                child, name, name_size);
+                                target->dirty = true;
+                                rc = block_put(target);
+                                if (rc != EOK) {
+                                        return EXT4_ERR_BAD_DX_DIR;
+                                }
+                                return EOK;
+                }
+
+                if (de_inode != 0) {
+                        uint16_t used_name_len = ext4_directory_entry_ll_get_name_length(
+                                        fs->superblock, de);
+
+                        uint16_t used_space = 8 + used_name_len;
+                        if ((used_name_len % 4) != 0) {
+                                used_space += 4 - (used_name_len % 4);
+                        }
+                        uint16_t free_space = de_rec_len - used_space;
+
+                        if (free_space >= required_len) {
+
+                                EXT4FS_DBG("rec_len = \%u, used_space = \%u, free space = \%u", de_rec_len, used_space, free_space);
+
+                                // Cut tail of current entry
+                                ext4_directory_entry_ll_set_entry_length(de, used_space);
+                                ext4_directory_entry_ll_t *new_entry = (void *)de + used_space;
+                                ext4_directory_write_entry(fs->superblock, new_entry,
+                                        free_space, child, name, name_size);
+                                target->dirty = true;
+                                rc = block_put(target);
+                                if (rc != EOK) {
+                                        return EXT4_ERR_BAD_DX_DIR;
+                                }
+                                return EOK;
+
+                        }
+
+                }
+
+                de = (void *)de + de_rec_len;
+        }
+
+
+        EXT4FS_DBG("ERRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR");
+        return EXT4_ERR_BAD_DX_DIR;
+
+        // if ENOSPC in block -> next code
+
+        ext4_directory_dx_entry_t *entries = ((ext4_directory_dx_node_t *) dx_block->block->data)->entries;
+        uint16_t limit = ext4_directory_dx_countlimit_get_limit((ext4_directory_dx_countlimit_t *)entries);
+        uint16_t count = ext4_directory_dx_countlimit_get_count((ext4_directory_dx_countlimit_t *)entries);
+
+        ext4_directory_dx_entry_t *root_entries = ((ext4_directory_dx_node_t *) dx_blocks[0].block->data)->entries;
+
+        if (limit == count) {
+                EXT4FS_DBG("need to split index block !!!");
+
+                unsigned int levels = dx_block - dx_blocks;
+
+                uint16_t root_limit = ext4_directory_dx_countlimit_get_limit((ext4_directory_dx_countlimit_t *)root_entries);
+                uint16_t root_count = ext4_directory_dx_countlimit_get_count((ext4_directory_dx_countlimit_t *)root_entries);
+
+                if ((levels > 0) && (root_limit == root_count)) {
+                        EXT4FS_DBG("Directory index is full");
+
+                        // ENOSPC - cleanup !!!
+                        return ENOSPC;
+                }
+
+
+        }
+
         // TODO
-        /*
-         * 1) try to write entry
-         * 2) split leaves if necessary
-         * 3) return
-         */
-
+        return EOK;
 
 }