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Message-Id: <20210120212641.526556-14-user@harshads-520.kir.corp.google.com>
Date: Wed, 20 Jan 2021 13:26:39 -0800
From: Harshad Shirwadkar <harshadshirwadkar@...il.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu, Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH v3 13/15] debugfs: add fast commit support to logdump
From: Harshad Shirwadkar <harshadshirwadkar@...il.com>
Add fast commit support for debugfs logdump. The debugfs output looks
like this:
debugfs 1.46-WIP (20-Mar-2020)
debugfs: logdump
Journal starts at block 1, transaction 2
Found expected sequence 2, type 1 (descriptor block) at block 1
Found expected sequence 2, type 2 (commit block) at block 10
No magic number at block 11: end of journal.
*** Fast Commit Area ***
tag HEAD, features 0x0, tid 3
tag INODE, inode 14
tag ADD_RANGE, inode 14, lblk 0, pblk 1091, len 1
tag DEL_RANGE, inode 14, lblk 1, len 1
tag CREAT_DENTRY, parent 12, ino 14, name "new"
tag DEL_ENTRY, parent 12, ino 13, name "old"
tag INODE, inode 13
tag ADD_RANGE, inode 13, lblk 0, pblk 1603, len 16
tag ADD_RANGE, inode 13, lblk 16, pblk 1092, len 240
tag CREAT_DENTRY, parent 12, ino 13, name "data"
tag INODE, inode 14
tag INODE, inode 13
tag TAIL, tid 3
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
---
debugfs/logdump.c | 122 ++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 117 insertions(+), 5 deletions(-)
diff --git a/debugfs/logdump.c b/debugfs/logdump.c
index 16889954..dbcc2fd3 100644
--- a/debugfs/logdump.c
+++ b/debugfs/logdump.c
@@ -33,6 +33,7 @@ extern char *optarg;
#include "debugfs.h"
#include "blkid/blkid.h"
#include "jfs_user.h"
+#include "ext2fs/fast_commit.h"
#include <uuid/uuid.h>
enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
@@ -65,6 +66,9 @@ static void dump_metadata_block(FILE *, struct journal_source *,
unsigned int, unsigned int, unsigned int,
int, tid_t);
+static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
+ int transaction, int *fc_done, int dump_old);
+
static void do_hexdump (FILE *, char *, int);
#define WRAP(jsb, blocknr) \
@@ -353,6 +357,7 @@ static void dump_journal(char *cmdname, FILE *out_file,
journal_header_t *header;
tid_t transaction;
unsigned int blocknr = 0;
+ int fc_done;
/* First, check to see if there's an ext2 superblock header */
retval = read_journal_block(cmdname, source, 0, buf, 2048);
@@ -410,7 +415,7 @@ static void dump_journal(char *cmdname, FILE *out_file,
if (!blocknr) {
/* Empty journal, nothing to do. */
if (!dump_old)
- return;
+ goto fc;
else
blocknr = 1;
}
@@ -420,7 +425,7 @@ static void dump_journal(char *cmdname, FILE *out_file,
((ext2_loff_t) blocknr) * blocksize,
buf, blocksize);
if (retval)
- return;
+ break;
header = (journal_header_t *) buf;
@@ -431,7 +436,7 @@ static void dump_journal(char *cmdname, FILE *out_file,
if (magic != JBD2_MAGIC_NUMBER) {
fprintf (out_file, "No magic number at block %u: "
"end of journal.\n", blocknr);
- return;
+ break;
}
if (sequence != transaction) {
@@ -439,7 +444,7 @@ static void dump_journal(char *cmdname, FILE *out_file,
"block %u: end of journal.\n",
sequence, transaction, blocknr);
if (!dump_old)
- return;
+ break;
}
if (dump_descriptors) {
@@ -473,9 +478,25 @@ static void dump_journal(char *cmdname, FILE *out_file,
default:
fprintf (out_file, "Unexpected block type %u at "
"block %u.\n", blocktype, blocknr);
- return;
+ break;
}
}
+
+fc:
+ blocknr = be32_to_cpu(jsb->s_maxlen) - jbd_get_num_fc_blks(jsb) + 1;
+ while (blocknr <= be32_to_cpu(jsb->s_maxlen)) {
+ retval = read_journal_block(cmdname, source,
+ ((ext2_loff_t) blocknr) * blocksize,
+ buf, blocksize);
+ if (retval)
+ return;
+
+ dump_fc_block(out_file, buf, blocksize, transaction, &fc_done,
+ dump_old);
+ if (!dump_old && fc_done)
+ break;
+ blocknr++;
+ }
}
static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
@@ -496,6 +517,97 @@ static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
return sz - sizeof(__u32);
}
+static void dump_fc_block(FILE *out_file, char *buf, int blocksize,
+ int transaction, int *fc_done, int dump_old)
+{
+ struct ext4_fc_tl *tl;
+ struct ext4_fc_head *head;
+ struct ext4_fc_add_range *add_range;
+ struct ext4_fc_del_range *del_range;
+ struct ext4_fc_dentry_info *dentry_info;
+ struct ext4_fc_tail *tail;
+ struct ext3_extent *ex;
+
+ *fc_done = 0;
+ fc_for_each_tl(buf, buf + blocksize, tl) {
+ switch (le16_to_cpu(tl->fc_tag)) {
+ case EXT4_FC_TAG_ADD_RANGE:
+ add_range =
+ (struct ext4_fc_add_range *)ext4_fc_tag_val(tl);
+ ex = (struct ext3_extent *)add_range->fc_ex;
+ fprintf(out_file,
+ "tag %s, inode %d, lblk %d, pblk %ld, len %d\n",
+ tag2str(tl->fc_tag),
+ le32_to_cpu(add_range->fc_ino),
+ le32_to_cpu(ex->ee_block),
+ le32_to_cpu(ex->ee_start) +
+ (((__u64) le16_to_cpu(ex->ee_start_hi)) << 32),
+ le16_to_cpu(ex->ee_len) > EXT_INIT_MAX_LEN ?
+ le16_to_cpu(ex->ee_len) - EXT_INIT_MAX_LEN :
+ le16_to_cpu(ex->ee_len));
+ break;
+ case EXT4_FC_TAG_DEL_RANGE:
+ del_range =
+ (struct ext4_fc_del_range *)ext4_fc_tag_val(tl);
+ fprintf(out_file, "tag %s, inode %d, lblk %d, len %d\n",
+ tag2str(tl->fc_tag),
+ le32_to_cpu(del_range->fc_ino),
+ le32_to_cpu(del_range->fc_lblk),
+ le32_to_cpu(del_range->fc_len));
+ break;
+ case EXT4_FC_TAG_LINK:
+ case EXT4_FC_TAG_UNLINK:
+ case EXT4_FC_TAG_CREAT:
+ dentry_info =
+ (struct ext4_fc_dentry_info *)
+ ext4_fc_tag_val(tl);
+ fprintf(out_file,
+ "tag %s, parent %d, ino %d, name \"%s\"\n",
+ tag2str(tl->fc_tag),
+ le32_to_cpu(dentry_info->fc_parent_ino),
+ le32_to_cpu(dentry_info->fc_ino),
+ dentry_info->fc_dname);
+ break;
+ case EXT4_FC_TAG_INODE:
+ fprintf(out_file, "tag %s, inode %d\n",
+ tag2str(tl->fc_tag),
+ le32_to_cpu(((struct ext4_fc_inode *)
+ ext4_fc_tag_val(tl))->fc_ino));
+ break;
+ case EXT4_FC_TAG_PAD:
+ fprintf(out_file, "tag %s\n", tag2str(tl->fc_tag));
+ break;
+ case EXT4_FC_TAG_TAIL:
+ tail = (struct ext4_fc_tail *)ext4_fc_tag_val(tl);
+ fprintf(out_file, "tag %s, tid %d\n",
+ tag2str(tl->fc_tag),
+ le32_to_cpu(tail->fc_tid));
+ if (!dump_old &&
+ le32_to_cpu(tail->fc_tid) < transaction) {
+ *fc_done = 1;
+ return;
+ }
+ break;
+ case EXT4_FC_TAG_HEAD:
+ fprintf(out_file, "\n*** Fast Commit Area ***\n");
+ head = (struct ext4_fc_head *)ext4_fc_tag_val(tl);
+ fprintf(out_file, "tag %s, features 0x%x, tid %d\n",
+ tag2str(tl->fc_tag),
+ le32_to_cpu(head->fc_features),
+ le32_to_cpu(head->fc_tid));
+ if (!dump_old &&
+ le32_to_cpu(head->fc_tid) < transaction) {
+ *fc_done = 1;
+ return;
+ }
+ break;
+ default:
+ *fc_done = 1;
+ break;
+ }
+ }
+}
+
static void dump_descriptor_block(FILE *out_file,
struct journal_source *source,
char *buf,
--
2.30.0.284.gd98b1dd5eaa7-goog
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