Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __FAST_COMMIT_H__
4#define __FAST_COMMIT_H__
5
6/* Fast commit tags */
7#define EXT4_FC_TAG_ADD_RANGE 0x0001
8#define EXT4_FC_TAG_DEL_RANGE 0x0002
9#define EXT4_FC_TAG_CREAT 0x0003
10#define EXT4_FC_TAG_LINK 0x0004
11#define EXT4_FC_TAG_UNLINK 0x0005
12#define EXT4_FC_TAG_INODE 0x0006
13#define EXT4_FC_TAG_PAD 0x0007
14#define EXT4_FC_TAG_TAIL 0x0008
15#define EXT4_FC_TAG_HEAD 0x0009
16
17#define EXT4_FC_SUPPORTED_FEATURES 0x0
18
19/* On disk fast commit tlv value structures */
20
21/* Fast commit on disk tag length structure */
22struct ext4_fc_tl {
23 __le16 fc_tag;
24 __le16 fc_len;
25};
26
27/* Value structure for tag EXT4_FC_TAG_HEAD. */
28struct ext4_fc_head {
29 __le32 fc_features;
30 __le32 fc_tid;
31};
32
33/* Value structure for EXT4_FC_TAG_ADD_RANGE. */
34struct ext4_fc_add_range {
35 __le32 fc_ino;
36 __u8 fc_ex[12];
37};
38
39/* Value structure for tag EXT4_FC_TAG_DEL_RANGE. */
40struct ext4_fc_del_range {
41 __le32 fc_ino;
42 __le32 fc_lblk;
43 __le32 fc_len;
44};
45
46/*
47 * This is the value structure for tags EXT4_FC_TAG_CREAT, EXT4_FC_TAG_LINK
48 * and EXT4_FC_TAG_UNLINK.
49 */
50struct ext4_fc_dentry_info {
51 __le32 fc_parent_ino;
52 __le32 fc_ino;
53 u8 fc_dname[0];
54};
55
56/* Value structure for EXT4_FC_TAG_INODE and EXT4_FC_TAG_INODE_PARTIAL. */
57struct ext4_fc_inode {
58 __le32 fc_ino;
59 __u8 fc_raw_inode[0];
60};
61
62/* Value structure for tag EXT4_FC_TAG_TAIL. */
63struct ext4_fc_tail {
64 __le32 fc_tid;
65 __le32 fc_crc;
66};
67
68/*
69 * In memory list of dentry updates that are performed on the file
70 * system used by fast commit code.
71 */
72struct ext4_fc_dentry_update {
73 int fcd_op; /* Type of update create / unlink / link */
74 int fcd_parent; /* Parent inode number */
75 int fcd_ino; /* Inode number */
76 struct qstr fcd_name; /* Dirent name */
77 unsigned char fcd_iname[DNAME_INLINE_LEN]; /* Dirent name string */
78 struct list_head fcd_list;
79};
80
81/*
82 * Fast commit reason codes
83 */
84enum {
85 /*
86 * Commit status codes:
87 */
88 EXT4_FC_REASON_OK = 0,
89 EXT4_FC_REASON_INELIGIBLE,
90 EXT4_FC_REASON_ALREADY_COMMITTED,
91 EXT4_FC_REASON_FC_START_FAILED,
92 EXT4_FC_REASON_FC_FAILED,
93
94 /*
95 * Fast commit ineligiblity reasons:
96 */
97 EXT4_FC_REASON_XATTR = 0,
98 EXT4_FC_REASON_CROSS_RENAME,
99 EXT4_FC_REASON_JOURNAL_FLAG_CHANGE,
100 EXT4_FC_REASON_NOMEM,
101 EXT4_FC_REASON_SWAP_BOOT,
102 EXT4_FC_REASON_RESIZE,
103 EXT4_FC_REASON_RENAME_DIR,
104 EXT4_FC_REASON_FALLOC_RANGE,
105 EXT4_FC_REASON_INODE_JOURNAL_DATA,
106 EXT4_FC_COMMIT_FAILED,
107 EXT4_FC_REASON_MAX
108};
109
110struct ext4_fc_stats {
111 unsigned int fc_ineligible_reason_count[EXT4_FC_REASON_MAX];
112 unsigned long fc_num_commits;
113 unsigned long fc_ineligible_commits;
114 unsigned long fc_numblks;
115};
116
117#define EXT4_FC_REPLAY_REALLOC_INCREMENT 4
118
119/*
120 * Physical block regions added to different inodes due to fast commit
121 * recovery. These are set during the SCAN phase. During the replay phase,
122 * our allocator excludes these from its allocation. This ensures that
123 * we don't accidentally allocating a block that is going to be used by
124 * another inode.
125 */
126struct ext4_fc_alloc_region {
127 ext4_lblk_t lblk;
128 ext4_fsblk_t pblk;
129 int ino, len;
130};
131
132/*
133 * Fast commit replay state.
134 */
135struct ext4_fc_replay_state {
136 int fc_replay_num_tags;
137 int fc_replay_expected_off;
138 int fc_current_pass;
139 int fc_cur_tag;
140 int fc_crc;
141 struct ext4_fc_alloc_region *fc_regions;
142 int fc_regions_size, fc_regions_used, fc_regions_valid;
143 int *fc_modified_inodes;
144 int fc_modified_inodes_used, fc_modified_inodes_size;
145};
146
147#define region_last(__region) (((__region)->lblk) + ((__region)->len) - 1)
148
149#define fc_for_each_tl(__start, __end, __tl) \
150 for (tl = (struct ext4_fc_tl *)start; \
151 (u8 *)tl < (u8 *)end; \
152 tl = (struct ext4_fc_tl *)((u8 *)tl + \
153 sizeof(struct ext4_fc_tl) + \
154 + le16_to_cpu(tl->fc_len)))
155
156
157#endif /* __FAST_COMMIT_H__ */