Changeset f62c901 in mainline

Timestamp:

2025-05-23T21:37:48Z (6 days ago)

Author:

Miroslav Cimerman <mc@…>

Children:

d91d076

Parents:

61f28c4

git-author:

Miroslav Cimerman <mc@…> (2025-05-23 21:34:00)

git-committer:

Miroslav Cimerman <mc@…> (2025-05-23 21:37:48)

Message:

ext4: write: sparse/unallocated block helper fcn

File:

• uspace/lib/ext4/src/ops.c (modified) (6 diffs)

uspace/lib/ext4/src/ops.c

@@ -64 +64 @@
 static bool ext4_is_dots(const uint8_t *, size_t);
 static errno_t ext4_instance_get(service_id_t, ext4_instance_t **);
+static errno_t handle_sparse_or_unallocated_fblock(ext4_filesystem_t *,
+    ext4_inode_ref_t *, uint32_t, uint32_t, uint32_t *, int *);
 
 /* Forward declarations of ext4 libfs operations. */
@@ -158 +160 @@
 }
 
-/*
- * Ext4 libfs operations.
- */
-
 /** Get instance from internal table by service_id.
  *
@@ -170 +168 @@
  *
  */
-errno_t ext4_instance_get(service_id_t service_id, ext4_instance_t **inst)
+static errno_t ext4_instance_get(service_id_t service_id, ext4_instance_t **inst)
 {
         fibril_mutex_lock(&instance_list_mutex);
@@ -190 +188 @@
         return EINVAL;
 }
+
+/*
+ * Ext4 libfs operations.
+ */
 
 /** Get root node of filesystem specified by service_id.
@@ -1322 +1324 @@
         }
 
-        /* Check for sparse file */
+        /* Handle sparse or unallocated block */
         if (fblock == 0) {
-                if ((ext4_superblock_has_feature_incompatible(fs->superblock,
-                    EXT4_FEATURE_INCOMPAT_EXTENTS)) &&
-                    (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
-                        uint32_t last_iblock =
-                            ext4_inode_get_size(fs->superblock, inode_ref->inode) /
-                            block_size;
-
-                        while (last_iblock < iblock) {
-                                rc = ext4_extent_append_block(inode_ref, &last_iblock,
-                                    &fblock, true);
-                                if (rc != EOK) {
-                                        async_answer_0(&call, rc);
-                                        goto exit;
-                                }
-                        }
-
-                        rc = ext4_extent_append_block(inode_ref, &last_iblock,
-                            &fblock, false);
-                        if (rc != EOK) {
-                                async_answer_0(&call, rc);
-                                goto exit;
-                        }
-                } else {
-                        rc = ext4_balloc_alloc_block(inode_ref, &fblock);
-                        if (rc != EOK) {
-                                async_answer_0(&call, rc);
-                                goto exit;
-                        }
-
-                        rc = ext4_filesystem_set_inode_data_block_index(inode_ref,
-                            iblock, fblock);
-                        if (rc != EOK) {
-                                ext4_balloc_free_block(inode_ref, fblock);
-                                async_answer_0(&call, rc);
-                                goto exit;
-                        }
+                rc = handle_sparse_or_unallocated_fblock(fs, inode_ref,
+                    block_size, iblock, &fblock, &flags);
+                if (rc != EOK) {
+                        async_answer_0(&call, rc);
+                        goto exit;
                 }
-
-                flags = BLOCK_FLAGS_NOREAD;
-                inode_ref->dirty = true;
         }
 
@@ -1404 +1372 @@
         rc2 = ext4_node_put(fn);
         return rc == EOK ? rc2 : rc;
+}
+
+/** Handle sparse or unallocated block.
+ *
+ * @param fs            Filesystem handle
+ * @param inode_ref     I-node reference
+ * @param block_size    Filesystem block size
+ * @param iblock        Logical block
+ * @param fblock        Place to store allocated block address
+ * @param flags         BLOCK_FLAGS to update
+ *
+ * @return Error code
+ *
+ */
+static errno_t handle_sparse_or_unallocated_fblock(ext4_filesystem_t *fs,
+    ext4_inode_ref_t *inode_ref, uint32_t block_size, uint32_t iblock,
+    uint32_t *fblock, int *flags)
+{
+        errno_t rc;
+
+        /* Check for sparse file */
+        if ((ext4_superblock_has_feature_incompatible(fs->superblock,
+            EXT4_FEATURE_INCOMPAT_EXTENTS)) &&
+            (ext4_inode_has_flag(inode_ref->inode, EXT4_INODE_FLAG_EXTENTS))) {
+                uint32_t last_iblock =
+                    ext4_inode_get_size(fs->superblock, inode_ref->inode) /
+                    block_size;
+
+                while (last_iblock < iblock) {
+                        rc = ext4_extent_append_block(inode_ref, &last_iblock,
+                            fblock, true);
+                        if (rc != EOK)
+                                return rc;
+                }
+
+                rc = ext4_extent_append_block(inode_ref, &last_iblock, fblock,
+                    false);
+                if (rc != EOK)
+                        return rc;
+        } else { /* Allocate new block */
+                rc = ext4_balloc_alloc_block(inode_ref, fblock);
+                if (rc != EOK)
+                        return rc;
+
+                rc = ext4_filesystem_set_inode_data_block_index(inode_ref,
+                    iblock, *fblock);
+                if (rc != EOK) {
+                        ext4_balloc_free_block(inode_ref, *fblock);
+                        return rc;
+                }
+        }
+
+        *flags = BLOCK_FLAGS_NOREAD;
+        inode_ref->dirty = true;
+
+        return EOK;
 }