aa75f4d3da
This patch adds main fast commit commit path handlers. The overall
patch can be divided into two inter-related parts:
(A) Metadata updates tracking
This part consists of helper functions to track changes that need
to be committed during a commit operation. These updates are
maintained by Ext4 in different in-memory queues. Following are
the APIs and their short description that are implemented in this
patch:
- ext4_fc_track_link/unlink/creat() - Track unlink. link and creat
operations
- ext4_fc_track_range() - Track changed logical block offsets
inodes
- ext4_fc_track_inode() - Track inodes
- ext4_fc_mark_ineligible() - Mark file system fast commit
ineligible()
- ext4_fc_start_update() / ext4_fc_stop_update() /
ext4_fc_start_ineligible() / ext4_fc_stop_ineligible() These
functions are useful for co-ordinating inode updates with
commits.
(B) Main commit Path
This part consists of functions to convert updates tracked in
in-memory data structures into on-disk commits. Function
ext4_fc_commit() is the main entry point to commit path.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201015203802.3597742-6-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __FAST_COMMIT_H__
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#define __FAST_COMMIT_H__
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/* Number of blocks in journal area to allocate for fast commits */
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#define EXT4_NUM_FC_BLKS 256
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/* Fast commit tags */
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#define EXT4_FC_TAG_ADD_RANGE 0x0001
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#define EXT4_FC_TAG_DEL_RANGE 0x0002
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#define EXT4_FC_TAG_CREAT 0x0003
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#define EXT4_FC_TAG_LINK 0x0004
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#define EXT4_FC_TAG_UNLINK 0x0005
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#define EXT4_FC_TAG_INODE 0x0006
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#define EXT4_FC_TAG_PAD 0x0007
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#define EXT4_FC_TAG_TAIL 0x0008
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#define EXT4_FC_TAG_HEAD 0x0009
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#define EXT4_FC_SUPPORTED_FEATURES 0x0
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/* On disk fast commit tlv value structures */
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/* Fast commit on disk tag length structure */
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struct ext4_fc_tl {
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__le16 fc_tag;
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__le16 fc_len;
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};
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/* Value structure for tag EXT4_FC_TAG_HEAD. */
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struct ext4_fc_head {
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__le32 fc_features;
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__le32 fc_tid;
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};
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/* Value structure for EXT4_FC_TAG_ADD_RANGE. */
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struct ext4_fc_add_range {
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__le32 fc_ino;
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__u8 fc_ex[12];
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};
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/* Value structure for tag EXT4_FC_TAG_DEL_RANGE. */
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struct ext4_fc_del_range {
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__le32 fc_ino;
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__le32 fc_lblk;
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__le32 fc_len;
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};
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/*
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* This is the value structure for tags EXT4_FC_TAG_CREAT, EXT4_FC_TAG_LINK
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* and EXT4_FC_TAG_UNLINK.
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*/
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struct ext4_fc_dentry_info {
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__le32 fc_parent_ino;
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__le32 fc_ino;
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u8 fc_dname[0];
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};
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/* Value structure for EXT4_FC_TAG_INODE and EXT4_FC_TAG_INODE_PARTIAL. */
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struct ext4_fc_inode {
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__le32 fc_ino;
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__u8 fc_raw_inode[0];
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};
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/* Value structure for tag EXT4_FC_TAG_TAIL. */
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struct ext4_fc_tail {
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__le32 fc_tid;
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__le32 fc_crc;
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};
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/*
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* In memory list of dentry updates that are performed on the file
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* system used by fast commit code.
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*/
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struct ext4_fc_dentry_update {
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int fcd_op; /* Type of update create / unlink / link */
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int fcd_parent; /* Parent inode number */
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int fcd_ino; /* Inode number */
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struct qstr fcd_name; /* Dirent name */
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unsigned char fcd_iname[DNAME_INLINE_LEN]; /* Dirent name string */
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struct list_head fcd_list;
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};
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/*
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* Fast commit reason codes
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*/
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enum {
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/*
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* Commit status codes:
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*/
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EXT4_FC_REASON_OK = 0,
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EXT4_FC_REASON_INELIGIBLE,
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EXT4_FC_REASON_ALREADY_COMMITTED,
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EXT4_FC_REASON_FC_START_FAILED,
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EXT4_FC_REASON_FC_FAILED,
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/*
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* Fast commit ineligiblity reasons:
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*/
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EXT4_FC_REASON_XATTR = 0,
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EXT4_FC_REASON_CROSS_RENAME,
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EXT4_FC_REASON_JOURNAL_FLAG_CHANGE,
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EXT4_FC_REASON_MEM,
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EXT4_FC_REASON_SWAP_BOOT,
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EXT4_FC_REASON_RESIZE,
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EXT4_FC_REASON_RENAME_DIR,
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EXT4_FC_REASON_FALLOC_RANGE,
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EXT4_FC_COMMIT_FAILED,
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EXT4_FC_REASON_MAX
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};
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struct ext4_fc_stats {
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unsigned int fc_ineligible_reason_count[EXT4_FC_REASON_MAX];
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unsigned long fc_num_commits;
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unsigned long fc_ineligible_commits;
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unsigned long fc_numblks;
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};
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#endif /* __FAST_COMMIT_H__ */
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