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-rw-r--r--lib/ext2fs/fast_commit.h190
1 files changed, 190 insertions, 0 deletions
diff --git a/lib/ext2fs/fast_commit.h b/lib/ext2fs/fast_commit.h
new file mode 100644
index 0000000..4ad38f1
--- /dev/null
+++ b/lib/ext2fs/fast_commit.h
@@ -0,0 +1,190 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __FAST_COMMIT_H__
+#define __FAST_COMMIT_H__
+
+#include "jfs_compat.h"
+
+/*
+ * Note this file is present in e2fsprogs/lib/ext2fs/fast_commit.h and
+ * linux/fs/ext4/fast_commit.h. These file should always be byte identical.
+ */
+
+/* Fast commit tags */
+#define EXT4_FC_TAG_ADD_RANGE 0x0001
+#define EXT4_FC_TAG_DEL_RANGE 0x0002
+#define EXT4_FC_TAG_CREAT 0x0003
+#define EXT4_FC_TAG_LINK 0x0004
+#define EXT4_FC_TAG_UNLINK 0x0005
+#define EXT4_FC_TAG_INODE 0x0006
+#define EXT4_FC_TAG_PAD 0x0007
+#define EXT4_FC_TAG_TAIL 0x0008
+#define EXT4_FC_TAG_HEAD 0x0009
+
+#define EXT4_FC_SUPPORTED_FEATURES 0x0
+
+/* On disk fast commit tlv value structures */
+
+/* Fast commit on disk tag length structure */
+struct ext4_fc_tl {
+ __le16 fc_tag;
+ __le16 fc_len;
+};
+
+/* Value structure for tag EXT4_FC_TAG_HEAD. */
+struct ext4_fc_head {
+ __le32 fc_features;
+ __le32 fc_tid;
+};
+
+/* Value structure for EXT4_FC_TAG_ADD_RANGE. */
+struct ext4_fc_add_range {
+ __le32 fc_ino;
+ __u8 fc_ex[12];
+};
+
+/* Value structure for tag EXT4_FC_TAG_DEL_RANGE. */
+struct ext4_fc_del_range {
+ __le32 fc_ino;
+ __le32 fc_lblk;
+ __le32 fc_len;
+};
+
+/*
+ * This is the value structure for tags EXT4_FC_TAG_CREAT, EXT4_FC_TAG_LINK
+ * and EXT4_FC_TAG_UNLINK.
+ */
+struct ext4_fc_dentry_info {
+ __le32 fc_parent_ino;
+ __le32 fc_ino;
+ __u8 fc_dname[0];
+};
+
+/* Value structure for EXT4_FC_TAG_INODE and EXT4_FC_TAG_INODE_PARTIAL. */
+struct ext4_fc_inode {
+ __le32 fc_ino;
+ __u8 fc_raw_inode[0];
+};
+
+/* Value structure for tag EXT4_FC_TAG_TAIL. */
+struct ext4_fc_tail {
+ __le32 fc_tid;
+ __le32 fc_crc;
+};
+
+/*
+ * Fast commit reason codes
+ */
+enum {
+ /*
+ * Commit status codes:
+ */
+ EXT4_FC_REASON_OK = 0,
+ EXT4_FC_REASON_INELIGIBLE,
+ EXT4_FC_REASON_ALREADY_COMMITTED,
+ EXT4_FC_REASON_FC_START_FAILED,
+ EXT4_FC_REASON_FC_FAILED,
+
+ /*
+ * Fast commit ineligiblity reasons:
+ */
+ EXT4_FC_REASON_XATTR = 0,
+ EXT4_FC_REASON_CROSS_RENAME,
+ EXT4_FC_REASON_JOURNAL_FLAG_CHANGE,
+ EXT4_FC_REASON_NOMEM,
+ EXT4_FC_REASON_SWAP_BOOT,
+ EXT4_FC_REASON_RESIZE,
+ EXT4_FC_REASON_RENAME_DIR,
+ EXT4_FC_REASON_FALLOC_RANGE,
+ EXT4_FC_REASON_INODE_JOURNAL_DATA,
+ EXT4_FC_COMMIT_FAILED,
+ EXT4_FC_REASON_MAX
+};
+
+#ifdef __KERNEL__
+/*
+ * In memory list of dentry updates that are performed on the file
+ * system used by fast commit code.
+ */
+struct ext4_fc_dentry_update {
+ int fcd_op; /* Type of update create / unlink / link */
+ int fcd_parent; /* Parent inode number */
+ int fcd_ino; /* Inode number */
+ struct qstr fcd_name; /* Dirent name */
+ unsigned char fcd_iname[DNAME_INLINE_LEN]; /* Dirent name string */
+ struct list_head fcd_list;
+};
+
+struct ext4_fc_stats {
+ unsigned int fc_ineligible_reason_count[EXT4_FC_REASON_MAX];
+ unsigned long fc_num_commits;
+ unsigned long fc_ineligible_commits;
+ unsigned long fc_numblks;
+};
+
+#define EXT4_FC_REPLAY_REALLOC_INCREMENT 4
+
+/*
+ * Physical block regions added to different inodes due to fast commit
+ * recovery. These are set during the SCAN phase. During the replay phase,
+ * our allocator excludes these from its allocation. This ensures that
+ * we don't accidentally allocating a block that is going to be used by
+ * another inode.
+ */
+struct ext4_fc_alloc_region {
+ ext4_lblk_t lblk;
+ ext4_fsblk_t pblk;
+ int ino, len;
+};
+
+/*
+ * Fast commit replay state.
+ */
+struct ext4_fc_replay_state {
+ int fc_replay_num_tags;
+ int fc_replay_expected_off;
+ int fc_current_pass;
+ int fc_cur_tag;
+ int fc_crc;
+ struct ext4_fc_alloc_region *fc_regions;
+ int fc_regions_size, fc_regions_used, fc_regions_valid;
+ int *fc_modified_inodes;
+ int fc_modified_inodes_used, fc_modified_inodes_size;
+};
+
+#define region_last(__region) (((__region)->lblk) + ((__region)->len) - 1)
+#endif
+
+static inline const char *tag2str(__u16 tag)
+{
+ switch (tag) {
+ case EXT4_FC_TAG_LINK:
+ return "ADD_ENTRY";
+ case EXT4_FC_TAG_UNLINK:
+ return "DEL_ENTRY";
+ case EXT4_FC_TAG_ADD_RANGE:
+ return "ADD_RANGE";
+ case EXT4_FC_TAG_CREAT:
+ return "CREAT_DENTRY";
+ case EXT4_FC_TAG_DEL_RANGE:
+ return "DEL_RANGE";
+ case EXT4_FC_TAG_INODE:
+ return "INODE";
+ case EXT4_FC_TAG_PAD:
+ return "PAD";
+ case EXT4_FC_TAG_TAIL:
+ return "TAIL";
+ case EXT4_FC_TAG_HEAD:
+ return "HEAD";
+ default:
+ return "ERROR";
+ }
+}
+
+/* Get length of a particular tlv */
+static inline int ext4_fc_tag_len(struct ext4_fc_tl *tl)
+{
+ return le16_to_cpu(tl->fc_len);
+}
+
+#endif /* __FAST_COMMIT_H__ */