Changeset 1e65444 in mainline for uspace/lib/ext4/libext4_filesystem.c

Timestamp:

2011-11-09T17:52:33Z (14 years ago)

Author:

Frantisek Princ <frantisek.princ@…>

Branches:

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

Children:

2b9e142

Parents:

35f48f2

Message:

more functional file writing - indirect blocks too

File:

• uspace/lib/ext4/libext4_filesystem.c (modified) (2 diffs)

uspace/lib/ext4/libext4_filesystem.c

@@ -364 +364 @@
 
 int ext4_filesystem_set_inode_data_block_index(ext4_filesystem_t *fs,
-                ext4_inode_t *inode, aoff64_t iblock, uint32_t fblock)
-{
-
-//      int rc;
-//      uint32_t offset_in_block;
-//      uint32_t current_block;
-//      aoff64_t block_offset_in_level;
-//      int i;
-//      int level;
-//      block_t *block;
+                ext4_inode_ref_t *inode_ref, aoff64_t iblock, uint32_t fblock)
+{
+
+        int rc;
+        uint32_t offset_in_block;
+        uint32_t current_block, new_block_addr;
+        uint32_t block_size;
+        aoff64_t block_offset_in_level;
+        int i;
+        int level;
+        block_t *block, *new_block;
 
         /* Handle inode using extents */
         if (ext4_superblock_has_feature_compatible(fs->superblock, EXT4_FEATURE_INCOMPAT_EXTENTS) &&
-                        ext4_inode_has_flag(inode, EXT4_INODE_FLAG_EXTENTS)) {
+                        ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS)) {
                 // TODO
                 return ENOTSUP;
@@ -385 +386 @@
         /* Handle simple case when we are dealing with direct reference */
         if (iblock < EXT4_INODE_DIRECT_BLOCK_COUNT) {
-                ext4_inode_set_direct_block(inode, (uint32_t)iblock, fblock);
+                ext4_inode_set_direct_block(inode_ref->inode, (uint32_t)iblock, fblock);
+                inode_ref->dirty = true;
                 return EOK;
         }
 
-//      /* Determine the indirection level needed to get the desired block */
-//      level = -1;
-//      for (i = 1; i < 4; i++) {
-//              if (iblock < fs->inode_block_limits[i]) {
-//                      level = i;
-//                      break;
-//              }
-//      }
-//
-//      if (level == -1) {
-//              return EIO;
-//      }
-//
-//      /* Compute offsets for the topmost level */
-//      block_offset_in_level = iblock - fs->inode_block_limits[level-1];
-//      current_block = ext4_inode_get_indirect_block(inode, level-1);
-//      offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
-//
-//      /* Navigate through other levels, until we find the block number
-//       * or find null reference meaning we are dealing with sparse file
-//       */
-//      while (level > 0) {
-//              rc = block_get(&block, fs->device, current_block, 0);
-//              if (rc != EOK) {
-//                      return rc;
-//              }
-//
-//              current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
-//
-//              rc = block_put(block);
-//              if (rc != EOK) {
-//                      return rc;
-//              }
-//
-//              if (current_block == 0) {
-//                      /* This is a sparse file */
-//                      *fblock = 0;
-//                      return EOK;
-//              }
-//
-//              level -= 1;
-//
-//              /* If we are on the last level, break here as
-//               * there is no next level to visit
-//               */
-//              if (level == 0) {
-//                      break;
-//              }
-//
-//              /* Visit the next level */
-//              block_offset_in_level %= fs->inode_blocks_per_level[level];
-//              offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
-//      }
-//
-//      *fblock = current_block;
-//
-//      return EOK;
-//
-//
+        /* Determine the indirection level needed to get the desired block */
+        level = -1;
+        for (i = 1; i < 4; i++) {
+                if (iblock < fs->inode_block_limits[i]) {
+                        level = i;
+                        break;
+                }
+        }
+
+        if (level == -1) {
+                return EIO;
+        }
+
+        block_size = ext4_superblock_get_block_size(fs->superblock);
+
+        /* Compute offsets for the topmost level */
+        block_offset_in_level = iblock - fs->inode_block_limits[level-1];
+        current_block = ext4_inode_get_indirect_block(inode_ref->inode, level-1);
+        offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
+
+        if (current_block == 0) {
+                rc = ext4_bitmap_alloc_block(fs, inode_ref, &new_block_addr);
+                if (rc != EOK) {
+                        // TODO error
+                }
+                EXT4FS_DBG("AAA: new addr \%u, level = \%u", new_block_addr, level);
+
+                ext4_inode_set_indirect_block(inode_ref->inode, level - 1, new_block_addr);
+
+                inode_ref->dirty = true;
+
+                rc = block_get(&new_block, fs->device, new_block_addr, BLOCK_FLAGS_NOREAD);
+                if (rc != EOK) {
+                        EXT4FS_DBG("block load error");
+                        // TODO error
+                }
+
+                memset(new_block->data, 0, block_size);
+                new_block->dirty = true;
+
+                rc = block_put(new_block);
+                if (rc != EOK) {
+                        EXT4FS_DBG("block put error");
+                }
+
+                current_block = new_block_addr;
+        }
+
+        /* Navigate through other levels, until we find the block number
+         * or find null reference meaning we are dealing with sparse file
+         */
+        while (level > 0) {
+
+                rc = block_get(&block, fs->device, current_block, 0);
+                if (rc != EOK) {
+                        return rc;
+                }
+
+                current_block = uint32_t_le2host(((uint32_t*)block->data)[offset_in_block]);
+
+                if (current_block == 0) {
+                        if (level > 1) {
+
+                                rc = ext4_bitmap_alloc_block(fs, inode_ref, &new_block_addr);
+                                if (rc != EOK) {
+                                        // TODO error
+                                }
+
+                                rc = block_get(&new_block, fs->device, new_block_addr, BLOCK_FLAGS_NOREAD);
+                                if (rc != EOK) {
+                                        // TODO error
+                                }
+                                memset(new_block->data, 0, block_size);
+                                new_block->dirty = true;
+
+                                block_put(new_block);
+
+                                ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(new_block_addr);
+                                block->dirty = true;
+                                current_block = new_block_addr;
+                        } else {
+                                ((uint32_t*)block->data)[offset_in_block] = host2uint32_t_le(fblock);
+                                block->dirty = true;
+                        }
+                }
+
+                rc = block_put(block);
+                if (rc != EOK) {
+                        return rc;
+                }
+
+                level -= 1;
+
+                /* If we are on the last level, break here as
+                 * there is no next level to visit
+                 */
+                if (level == 0) {
+                        break;
+                }
+
+                /* Visit the next level */
+                block_offset_in_level %= fs->inode_blocks_per_level[level];
+                offset_in_block = block_offset_in_level / fs->inode_blocks_per_level[level-1];
+        }
 
         return EOK;