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Date: Mon, 19 Feb 2018 17:58:39 +0300
From: Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
To: linux-ext4@...r.kernel.org
Cc: Theodore Ts'o <tytso@....edu>,
Dmitry Monakhov <dmonakhov@...nvz.org>,
Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
Subject: [PATCH v2 4/5] dumpe2fs: add JSON output of journal
This patch adds JSON output of journal information
Signed-off-by: Viktor Prutyanov <viktor.prutyanov@...tuozzo.com>
---
lib/e2p/e2p.h | 2 ++
lib/e2p/ljs.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
misc/dumpe2fs.c | 20 +++++++++++++-------
3 files changed, 72 insertions(+), 7 deletions(-)
diff --git a/lib/e2p/e2p.h b/lib/e2p/e2p.h
index 88c08d73..cd3793e5 100644
--- a/lib/e2p/e2p.h
+++ b/lib/e2p/e2p.h
@@ -83,3 +83,5 @@ int e2p_string2os(char *str);
unsigned int e2p_percent(int percent, unsigned int base);
void fill_json_super(struct json_obj *obj, struct ext2_super_block * s);
+void e2p_fill_json_journal_super(struct json_obj *obj, char *journal_sb_buf,
+ int exp_block_size, int flags);
diff --git a/lib/e2p/ljs.c b/lib/e2p/ljs.c
index 2db700b0..c75610b8 100644
--- a/lib/e2p/ljs.c
+++ b/lib/e2p/ljs.c
@@ -111,3 +111,60 @@ void e2p_list_journal_super(FILE *f, char *journal_sb_buf,
fprintf(f, "Journal errno: %d\n",
(int) ntohl(jsb->s_errno));
}
+
+void e2p_fill_json_journal_super(struct json_obj *obj, char *journal_sb_buf,
+ int exp_block_size, int flags)
+{
+ journal_superblock_t *jsb = (journal_superblock_t *) journal_sb_buf;
+ __u32 *mask_ptr, mask, m;
+ unsigned int size;
+ int i, j, printed = 0;
+ unsigned int nr_users;
+ struct json_obj *journal_obj = json_obj_create_in_obj(obj, "journal");
+ struct json_list *features_list, *users_list;
+ char buf[64];
+
+ features_list = json_list_create_in_obj(journal_obj, "journal-features", JSON_VAL_STRING);
+ for (i=0, mask_ptr=&jsb->s_feature_compat; i <3; i++,mask_ptr++) {
+ mask = e2p_be32(*mask_ptr);
+ for (j=0,m=1; j < 32; j++, m<<=1) {
+ if (mask & m)
+ json_list_add_str(features_list, e2p_jrnl_feature2string(i, m));
+ }
+ }
+ size = (ntohl(jsb->s_blocksize) / 1024) * ntohl(jsb->s_maxlen);
+ if (size < 8192)
+ json_obj_add_fmt_buf_str(journal_obj, "journal-size", buf, sizeof(buf), "%uk", size);
+ else
+ json_obj_add_fmt_buf_str(journal_obj, "journal-size", buf, sizeof(buf), "%uM", size >> 10);
+ nr_users = (unsigned int) ntohl(jsb->s_nr_users);
+ if (exp_block_size != ntohl(jsb->s_blocksize))
+ json_obj_add_fmt_buf_str(journal_obj, "journal-block-size", buf, sizeof(buf), "%u",
+ (unsigned int)ntohl(jsb->s_blocksize));
+ json_obj_add_fmt_buf_str(journal_obj, "journal-length", buf, sizeof(buf), "%u",
+ (unsigned int)ntohl(jsb->s_maxlen));
+ if (ntohl(jsb->s_first) != 1)
+ json_obj_add_fmt_buf_str(journal_obj, "journal-first-block", buf, sizeof(buf), "%u",
+ (unsigned int)ntohl(jsb->s_first));
+ json_obj_add_fmt_buf_str(journal_obj, "journal-sequence", buf, sizeof(buf), "0x%08x", (unsigned int)ntohl(jsb->s_sequence));
+ json_obj_add_fmt_buf_str(journal_obj, "journal-start", buf, sizeof(buf), "%u", (unsigned int)ntohl(jsb->s_start));
+ if (nr_users != 1)
+ json_obj_add_fmt_buf_str(journal_obj, "journal-number-of-users", buf, sizeof(buf), "%u", nr_users);
+ if (jsb->s_feature_compat & e2p_be32(JFS_FEATURE_COMPAT_CHECKSUM))
+ json_obj_add_str(journal_obj, "journal-checksum-type", "crc32");
+ if ((jsb->s_feature_incompat &
+ e2p_be32(JFS_FEATURE_INCOMPAT_CSUM_V3)) ||
+ (jsb->s_feature_incompat &
+ e2p_be32(JFS_FEATURE_INCOMPAT_CSUM_V2))) {
+ json_obj_add_str(journal_obj, "journal-checksum-type", journal_checksum_type_str(jsb->s_checksum_type));
+ json_obj_add_fmt_buf_str(journal_obj, "journal-checksum", buf, sizeof(buf), "0x%08x", e2p_be32(jsb->s_checksum));
+ }
+ if ((nr_users > 1) ||
+ !e2p_is_null_uuid(&jsb->s_users[0])) {
+ users_list = json_list_create_in_obj(journal_obj, "journal-users", JSON_VAL_STRING);
+ for (i=0; i < nr_users; i++)
+ json_list_add_str(users_list, e2p_uuid2str(&jsb->s_users[i*16]));
+ }
+ if (jsb->s_errno != 0)
+ json_obj_add_fmt_buf_str(journal_obj, "journal-errno", buf, sizeof(buf), "%d", (int) ntohl(jsb->s_errno));
+}
diff --git a/misc/dumpe2fs.c b/misc/dumpe2fs.c
index 6896b6f1..58362ec2 100644
--- a/misc/dumpe2fs.c
+++ b/misc/dumpe2fs.c
@@ -607,7 +607,7 @@ static void list_bad_blocks(ext2_filsys fs, int dump)
ext2fs_badblocks_list_free(bb_list);
}
-static void print_inline_journal_information(ext2_filsys fs)
+static void print_inline_journal_information(ext2_filsys fs, struct json_obj *obj)
{
journal_superblock_t *jsb;
struct ext2_inode inode;
@@ -643,10 +643,13 @@ static void print_inline_journal_information(ext2_filsys fs)
_("Journal superblock magic number invalid!\n"));
exit(1);
}
- e2p_list_journal_super(stdout, buf, fs->blocksize, 0);
+ if (obj)
+ e2p_fill_json_journal_super(obj, buf, fs->blocksize, 0);
+ else
+ e2p_list_journal_super(stdout, buf, fs->blocksize, 0);
}
-static void print_journal_information(ext2_filsys fs)
+static void print_journal_information(ext2_filsys fs, struct json_obj *obj)
{
errcode_t retval;
char buf[1024];
@@ -668,7 +671,10 @@ static void print_journal_information(ext2_filsys fs)
_("Couldn't find journal superblock magic numbers"));
exit(1);
}
- e2p_list_journal_super(stdout, buf, fs->blocksize, 0);
+ if (obj)
+ e2p_fill_json_journal_super(obj, buf, fs->blocksize, 0);
+ else
+ e2p_list_journal_super(stdout, buf, fs->blocksize, 0);
}
static void parse_extended_opts(const char *opts, blk64_t *superblock,
@@ -762,7 +768,7 @@ int main (int argc, char ** argv)
int c;
int grp_only = 0;
int json = 0;
- struct json_obj *dump_obj;
+ struct json_obj *dump_obj = NULL;
#ifdef ENABLE_NLS
setlocale(LC_MESSAGES, "");
@@ -877,9 +883,9 @@ try_open_again:
ext2fs_close_free(&fs);
exit(0);
}
- if (!json && ext2fs_has_feature_journal(fs->super) &&
+ if (ext2fs_has_feature_journal(fs->super) &&
(fs->super->s_journal_inum != 0))
- print_inline_journal_information(fs);
+ print_inline_journal_information(fs, dump_obj);
if (!json)
list_bad_blocks(fs, 0);
if (header_only) {
--
2.14.1
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