Changeset 3d4fd2c in mainline for uspace/lib/ext4/libext4_ialloc.c

Timestamp:

2011-11-22T16:56:09Z (13 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

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

Children:

82d7816

Parents:

bf66ef4

Message:

deleting regular files (directories is not debugged)

File:

• uspace/lib/ext4/libext4_ialloc.c (modified) (1 diff)

uspace/lib/ext4/libext4_ialloc.c

@@ -36 +36 @@
  */
 
+#include <errno.h>
 #include "libext4.h"
+
+static uint32_t ext4_ialloc_inode2index_in_group(ext4_superblock_t *sb,
+                uint32_t inode)
+{
+        uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
+        return (inode - 1) % inodes_per_group;
+}
+
+static uint32_t ext4_ialloc_get_bgid_of_inode(ext4_superblock_t *sb,
+                uint32_t inode)
+{
+        uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
+        return (inode - 1) / inodes_per_group;
+
+}
+
+
+int ext4_ialloc_free_inode(ext4_filesystem_t *fs, ext4_inode_ref_t *inode_ref)
+{
+        int rc;
+        uint32_t block_group = ext4_ialloc_get_bgid_of_inode(
+                        fs->superblock, inode_ref->index);
+        uint32_t index_in_group = ext4_ialloc_inode2index_in_group(
+                        fs->superblock, inode_ref->index);
+
+        ext4_block_group_ref_t *bg_ref;
+        rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
+        if (rc != EOK) {
+                EXT4FS_DBG("error in loading bg_ref \%d", rc);
+                return rc;
+        }
+
+        uint32_t bitmap_block_addr = ext4_block_group_get_inode_bitmap(
+                        bg_ref->block_group, fs->superblock);
+        block_t *bitmap_block;
+        rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
+        if (rc != EOK) {
+                EXT4FS_DBG("error in loading bitmap \%d", rc);
+                return rc;
+        }
+
+        ext4_bitmap_free_bit(bitmap_block->data, index_in_group);
+        bitmap_block->dirty = true;
+
+        rc = block_put(bitmap_block);
+        if (rc != EOK) {
+                // Error in saving bitmap
+                ext4_filesystem_put_block_group_ref(bg_ref);
+                EXT4FS_DBG("error in saving bitmap \%d", rc);
+                return rc;
+        }
+
+        // Update superblock free inodes count
+        uint32_t sb_free_inodes = ext4_superblock_get_free_inodes_count(fs->superblock);
+        sb_free_inodes--;
+        ext4_superblock_set_free_inodes_count(fs->superblock, sb_free_inodes);
+
+        // Update block group free inodes count
+        uint32_t free_inodes = ext4_block_group_get_free_inodes_count(
+                        bg_ref->block_group, fs->superblock);
+        free_inodes++;
+        ext4_block_group_set_free_inodes_count(bg_ref->block_group,
+                        fs->superblock, free_inodes);
+        bg_ref->dirty = true;
+
+        rc = ext4_filesystem_put_block_group_ref(bg_ref);
+        if (rc != EOK) {
+                EXT4FS_DBG("error in saving bg_ref \%d", rc);
+                // TODO error
+                return rc;
+        }
+
+        return EOK;
+}