fast_commit.h
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __FAST_COMMIT_H__
#define __FAST_COMMIT_H__
/* 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;
};
/*
* 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;
};
/*
* 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
};
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)
#define fc_for_each_tl(__start, __end, __tl) \
for (tl = (struct ext4_fc_tl *)start; \
(u8 *)tl < (u8 *)end; \
tl = (struct ext4_fc_tl *)((u8 *)tl + \
sizeof(struct ext4_fc_tl) + \
+ le16_to_cpu(tl->fc_len)))
#endif /* __FAST_COMMIT_H__ */