Introduce a new function check_file_extent() to check file extent,
such as datasum, hole, size.
Signed-off-by: Lu Fengqi <lufq.f...@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
cmds-check.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)
diff --git a/cmds-check.c b/cmds-check.c
index ad261f2..28ee8b6 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -3885,6 +3885,9 @@ out:
#define INODE_REF_MISSING (1<<4) /* INODE_REF/INODE_EXTREF not found */
#define INODE_ITEM_MISSING (1<<5) /* INODE_ITEM not found */
#define INODE_ITEM_MISMATCH (1<<6) /* INODE_ITEM found but not match */
+#define FILE_EXTENT_ERROR (1<<7) /* bad file extent */
+#define ODD_CSUM_ITEM (1<<8) /* CSUM_ITEM ERROR */
+#define CSUM_ITEM_MISSING (1<<9) /* CSUM_ITEM not found */
/*
* Find DIR_ITEM/DIR_INDEX for the given key and check it with the specified
@@ -4461,6 +4464,97 @@ next:
return err;
}
+/*
+ * Check file extent datasum/hole, update the size of the file extents,
+ * check and update the last offset of the file extent.
+ *
+ * @root: the root of fs/file tree.
+ * @fkey: the key of the file extent.
+ * @nodatasum: INODE_NODATASUM feature.
+ * @size: the sum of all EXTENT_DATA items size for this inode.
+ * @end: the offset of the last extent.
+ *
+ * Return 0 if no error occurred.
+ */
+static int check_file_extent(struct btrfs_root *root, struct btrfs_key *fkey,
+ struct extent_buffer *node, int slot,
+ unsigned int nodatasum, u64 *size, u64 *end)
+{
+ struct btrfs_file_extent_item *fi;
+ u64 disk_bytenr;
+ u64 disk_num_bytes;
+ u64 extent_num_bytes;
+ u64 found;
+ unsigned int extent_type;
+ unsigned int is_hole;
+ int ret;
+ int err = 0;
+
+ fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item);
+
+ extent_type = btrfs_file_extent_type(node, fi);
+ /* Skip if file extent is inline */
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ extent_num_bytes = btrfs_file_extent_inline_len(node, slot, fi);
+ if (extent_num_bytes == 0)
+ err |= FILE_EXTENT_ERROR;
+ *size += extent_num_bytes;
+ return err;
+ }
+
+ /* Check extent type */
+ if (extent_type != BTRFS_FILE_EXTENT_REG &&
+ extent_type != BTRFS_FILE_EXTENT_PREALLOC) {
+ err |= FILE_EXTENT_ERROR;
+ error("root %llu EXTENT_DATA[%llu %llu] type bad",
+ root->objectid, fkey->objectid, fkey->offset);
+ return err;
+ }
+
+ /* Check REG_EXTENT/PREALLOC_EXTENT */
+ disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi);
+ disk_num_bytes = btrfs_file_extent_disk_num_bytes(node, fi);
+ extent_num_bytes = btrfs_file_extent_num_bytes(node, fi);
+ is_hole = (disk_bytenr == 0) && (disk_num_bytes == 0);
+
+ /* Check EXTENT_DATA datasum */
+ ret = count_csum_range(root, disk_bytenr, disk_num_bytes, &found);
+ if (found > 0 && nodatasum) {
+ err |= ODD_CSUM_ITEM;
+ error(
+ "root %llu EXTENT_DATA[%llu %llu] nodatasum shouldn't have
datasum",
+ root->objectid, fkey->objectid, fkey->offset);
+ } else if (extent_type == BTRFS_FILE_EXTENT_REG && !nodatasum &&
+ !is_hole &&
+ (ret < 0 || found == 0 || found < disk_num_bytes)) {
+ err |= CSUM_ITEM_MISSING;
+ error("root %llu EXTENT_DATA[%llu %llu] datasum missing",
+ root->objectid, fkey->objectid, fkey->offset);
+ } else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC && found > 0) {
+ err |= ODD_CSUM_ITEM;
+ error(
+ "root %llu EXTENT_DATA[%llu %llu] prealloc shouldn't have
datasum",
+ root->objectid, fkey->objectid, fkey->offset);
+ }
+
+ /* Check EXTENT_DATA hole */
+ if (no_holes && is_hole) {
+ err |= FILE_EXTENT_ERROR;
+ error("root %llu EXTENT_DATA[%llu %llu] shouldn't be hole",
+ root->objectid, fkey->objectid, fkey->offset);
+ } else if (!no_holes && *end != fkey->offset) {
+ err |= FILE_EXTENT_ERROR;
+ error("root %llu EXTENT_DATA[%llu %llu] interrupt",
+ root->objectid, fkey->objectid, fkey->offset);
+ }
+
+ *end += extent_num_bytes;
+ if (!is_hole)
+ *size += extent_num_bytes;
+
+ return err;
+}
+
static int all_backpointers_checked(struct extent_record *rec, int print_errs)
{
struct rb_node *n;
--
2.7.4
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