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-rw-r--r--disk-io.h41
1 files changed, 25 insertions, 16 deletions
diff --git a/disk-io.h b/disk-io.h
index a73dede1..c404d3f4 100644
--- a/disk-io.h
+++ b/disk-io.h
@@ -29,21 +29,29 @@
#define BTRFS_SUPER_MIRROR_SHIFT 12
enum btrfs_open_ctree_flags {
- OPEN_CTREE_WRITES = (1 << 0),
- OPEN_CTREE_PARTIAL = (1 << 1),
- OPEN_CTREE_BACKUP_ROOT = (1 << 2),
- OPEN_CTREE_RECOVER_SUPER = (1 << 3),
- OPEN_CTREE_RESTORE = (1 << 4),
- OPEN_CTREE_NO_BLOCK_GROUPS = (1 << 5),
- OPEN_CTREE_EXCLUSIVE = (1 << 6),
- OPEN_CTREE_NO_DEVICES = (1 << 7),
+ /* Open filesystem for writes */
+ OPEN_CTREE_WRITES = (1U << 0),
+ /* Allow to open filesystem with some broken tree roots (eg log root) */
+ OPEN_CTREE_PARTIAL = (1U << 1),
+ /* If primary root pinters are invalid, try backup copies */
+ OPEN_CTREE_BACKUP_ROOT = (1U << 2),
+ /* Allow reading all superblock sopies if the primary is damaged */
+ OPEN_CTREE_RECOVER_SUPER = (1U << 3),
+ /* Restoring filesystem image */
+ OPEN_CTREE_RESTORE = (1U << 4),
+ /* Do not read block groups (extent tree) */
+ OPEN_CTREE_NO_BLOCK_GROUPS = (1U << 5),
+ /* Open all devices in O_EXCL mode */
+ OPEN_CTREE_EXCLUSIVE = (1U << 6),
+ /* Do not scan devices */
+ OPEN_CTREE_NO_DEVICES = (1U << 7),
/*
* Don't print error messages if bytenr or checksums do not match in
* tree block headers. Turn on by OPEN_CTREE_SUPPRESS_ERROR
*/
- OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS = (1 << 8),
- /* Return chunk root */
- __OPEN_CTREE_RETURN_CHUNK_ROOT = (1 << 9),
+ OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS = (1U << 8),
+ /* Return the chunk root */
+ __OPEN_CTREE_RETURN_CHUNK_ROOT = (1U << 9),
OPEN_CTREE_CHUNK_ROOT_ONLY = OPEN_CTREE_PARTIAL +
OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS +
__OPEN_CTREE_RETURN_CHUNK_ROOT,
@@ -53,18 +61,19 @@ enum btrfs_open_ctree_flags {
* Like split PARTIAL into SKIP_CSUM/SKIP_EXTENT
*/
- OPEN_CTREE_IGNORE_FSID_MISMATCH = (1 << 10),
+ /* Ignore UUID mismatches */
+ OPEN_CTREE_IGNORE_FSID_MISMATCH = (1U << 10),
/*
- * Allow open_ctree_fs_info() to return a incomplete fs_info with
+ * Allow open_ctree_fs_info() to return an incomplete fs_info with
* system chunks from super block only.
- * It's useful for chunk corruption case.
+ * It's useful when chunks are corrupted.
* Makes no sense for open_ctree variants returning btrfs_root.
*/
- OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1 << 11),
+ OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR = (1U << 11),
/* Allow to open a partially created filesystem */
- OPEN_CTREE_FS_PARTIAL = (1 << 12),
+ OPEN_CTREE_FS_PARTIAL = (1U << 12),
};
/*