linux-ext4 - [PATCH v5 12/20] ext4: add fast commit on-disk format structs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon,  9 Mar 2020 00:05:18 -0700
From:   Harshad Shirwadkar <harshadshirwadkar@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH v5 12/20] ext4: add fast commit on-disk format structs

Add structs representing on-disk format of the commit header and
tlvs in the commit header.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
 fs/ext4/ext4_jbd2.c |  1 +
 fs/ext4/ext4_jbd2.h | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index a29ae83df881..78c5431c7aad 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -4,6 +4,7 @@
  */
 
 #include "ext4_jbd2.h"
+#include "ext4_extents.h"
 
 #include <trace/events/ext4.h>
 
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index 401f142172e4..761148b99b35 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -526,7 +526,52 @@ static inline int ext4_should_dioread_nolock(struct inode *inode)
 	return 1;
 }
 
+/* Ext4 fast commit related info */
+
+/* Magic of fast commit header */
+#define EXT4_FC_MAGIC			0xE2540090
+
 #define EXT4_NUM_FC_BLKS		128
+
+struct ext4_fc_commit_hdr {
+	/* Fast commit magic, should be EXT4_FC_MAGIC */
+	__le32 fc_magic;
+	/* Features used by this fast commit block */
+	__u8 fc_features;
+	/* Number of TLVs in this fast commmit block */
+	__le16 fc_num_tlvs;
+	/* Inode number */
+	__le32 fc_ino;
+	/* Csum(hdr+contents) */
+	__le32 fc_csum;
+};
+
+/* Fast commit on disk tag length structure */
+struct ext4_fc_tl {
+	__le16 fc_tag;
+	__le16 fc_len;
+};
+
+/* On disk fast commit tlv value structure for dirent tags:
+ *  - EXT4_FC_TAG_CREATE_DENTRY
+ *  - EXT4_FC_TAG_ADD_DENTRY
+ *  - EXT4_FC_TAG_DEL_DENTRY
+ */
+struct ext4_fc_dentry_info {
+	__le32 fc_parent_ino;
+	__le32 fc_ino;
+	u8 fc_dname[0];
+};
+
+/*
+ * On disk fast commit tlv value structure for tag
+ * EXT4_FC_TAG_HOLE.
+ */
+struct ext4_fc_lrange {
+	__le32 fc_lblk;
+	__le32 fc_len;
+};
+
 void ext4_init_fast_commit(struct super_block *sb, journal_t *journal);
 void ext4_init_inode_fc_info(struct inode *inode);
 void ext4_fc_track_range(struct inode *inode, ext4_lblk_t start,
-- 
2.25.1.481.gfbce0eb801-goog