From: Guo Xuenan <guoxuenan@huawei.com>
To: <xiang@kernel.org>, <linux-erofs@lists.ozlabs.org>
Cc: mpiglet@outlook.com
Subject: [PATCH v3 2/5] dump.erofs: add "-s" option to dump superblock information
Date: Wed, 15 Sep 2021 17:35:34 +0800 [thread overview]
Message-ID: <20210915093537.2579575-2-guoxuenan@huawei.com> (raw)
In-Reply-To: <20210915093537.2579575-1-guoxuenan@huawei.com>
From: Wang Qi <mpiglet@outlook.com>
Signed-off-by: Guo Xuenan <guoxuenan@huawei.com>
Signed-off-by: Wang Qi <mpiglet@outlook.com>
---
dump/Makefile.am | 3 +-
dump/main.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 78 insertions(+), 2 deletions(-)
diff --git a/dump/Makefile.am b/dump/Makefile.am
index 3d8a32c..0bb7b4e 100644
--- a/dump/Makefile.am
+++ b/dump/Makefile.am
@@ -3,6 +3,7 @@
AUTOMAKE_OPTIONS = foreign
bin_PROGRAMS = dump.erofs
+AM_CPPFLAGS = ${libuuid_CFLAGS}
dump_erofs_SOURCES = main.c
dump_erofs_CFLAGS = -Wall -Werror -I$(top_srcdir)/include
-dump_erofs_LDADD = $(top_builddir)/lib/liberofs.la
\ No newline at end of file
+dump_erofs_LDADD = $(top_builddir)/lib/liberofs.la ${libuuid_LIBS}
\ No newline at end of file
diff --git a/dump/main.c b/dump/main.c
index af8db4b..7ece596 100644
--- a/dump/main.c
+++ b/dump/main.c
@@ -13,15 +13,38 @@
#include "erofs/print.h"
#include "erofs/io.h"
+#ifdef HAVE_LIBUUID
+#include <uuid.h>
+#endif
+
+struct dumpcfg {
+ bool print_superblock;
+ bool print_version;
+};
+static struct dumpcfg dumpcfg;
+
static struct option long_options[] = {
{"help", no_argument, 0, 1},
{0, 0, 0, 0},
};
+struct feature {
+ bool compat;
+ __le32 flag;
+ const char *name;
+};
+
+static struct feature feature_lists[] = {
+ { true, EROFS_FEATURE_COMPAT_SB_CHKSUM, "sb_csum" },
+ { false, EROFS_FEATURE_INCOMPAT_LZ4_0PADDING, "0padding" },
+ { false, EROFS_FEATURE_INCOMPAT_BIG_PCLUSTER, "bigpcluster" },
+};
+
static void usage(void)
{
fputs("usage: [options] IMAGE\n\n"
"Dump erofs layout from IMAGE, and [options] are:\n"
+ "-s print information about superblock\n"
"-V print the version number of dump.erofs and exit.\n"
"--help display this help and exit.\n",
stderr);
@@ -35,9 +58,12 @@ static int dumpfs_parse_options_cfg(int argc, char **argv)
{
int opt;
- while ((opt = getopt_long(argc, argv, "V",
+ while ((opt = getopt_long(argc, argv, "sV",
long_options, NULL)) != -1) {
switch (opt) {
+ case 's':
+ dumpcfg.print_superblock = true;
+ break;
case 'V':
dumpfs_print_version();
exit(0);
@@ -63,6 +89,40 @@ static int dumpfs_parse_options_cfg(int argc, char **argv)
return 0;
}
+static void dumpfs_print_superblock(void)
+{
+ time_t time = sbi.build_time;
+ char uuid_str[37] = "not available";
+ int i = 0;
+
+ fprintf(stdout, "Filesystem magic number: 0x%04X\n",
+ EROFS_SUPER_MAGIC_V1);
+ fprintf(stdout, "Filesystem blocks: %lu\n",
+ sbi.blocks);
+ fprintf(stdout, "Filesystem inode metadata start block: %u\n",
+ sbi.meta_blkaddr);
+ fprintf(stdout, "Filesystem shared xattr metadata start block: %u\n",
+ sbi.xattr_blkaddr);
+ fprintf(stdout, "Filesystem root nid: %ld\n",
+ sbi.root_nid);
+ fprintf(stdout, "Filesystem inode count: %lu\n",
+ sbi.inos);
+ fprintf(stdout, "Filesystem created: %s",
+ ctime(&time));
+ fprintf(stdout, "Filesystem features: ");
+ for (; i < ARRAY_SIZE(feature_lists); i++) {
+ __le32 feature = feature_lists[i].compat ?
+ sbi.feature_compat : sbi.feature_incompat;
+ if (feature & feature_lists[i].flag)
+ fprintf(stdout, "%s ", feature_lists[i].name);
+ }
+#ifdef HAVE_LIBUUID
+ uuid_unparse_lower(sbi.uuid, uuid_str);
+#endif
+ fprintf(stdout, "\nFilesystem UUID: %s\n",
+ uuid_str);
+}
+
int main(int argc, char **argv)
{
int err = 0;
@@ -75,6 +135,21 @@ int main(int argc, char **argv)
goto exit;
}
+ err = dev_open_ro(cfg.c_img_path);
+ if (err) {
+ erofs_err("open image file failed");
+ goto exit;
+ }
+
+ err = erofs_read_superblock();
+ if (err) {
+ erofs_err("read superblock failed");
+ goto exit;
+ }
+
+ if (dumpcfg.print_superblock)
+ dumpfs_print_superblock();
+
exit:
erofs_exit_configure();
return err;
--
2.25.4
next prev parent reply other threads:[~2021-09-15 9:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-15 9:35 [PATCH v3 1/5] erofs-utils: introduce dump.erofs Guo Xuenan
2021-09-15 9:35 ` Guo Xuenan [this message]
2021-09-15 9:35 ` [PATCH v3 3/5] dump.erofs: add -S options for collecting statistics of the whole filesystem Guo Xuenan
2021-09-15 9:35 ` [PATCH v3 4/5] dump.erofs: add -i options to dump file information of specific inode number Guo Xuenan
2021-09-15 9:35 ` [PATCH v3 5/5] dump.erofs: add -I options to dump the layout of a particular inode on disk Guo Xuenan
2021-09-26 3:21 ` [PATCH v3 1/5] erofs-utils: introduce dump.erofs Gao Xiang
2021-09-28 2:33 ` Gao Xiang
2021-09-28 6:23 ` Qi Wang
2021-09-28 7:54 ` Gao Xiang
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