From 352fbedb211a1df3eebedd6b6aecddea44008525 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Mon, 5 May 2014 00:20:31 -0400 Subject: [PATCH] mke2fs: print extra information about existing ext2/3/4 file systems The basic idea is to provide a bit more context in this situation: % ./misc/mke2fs -t ext4 /dev/sdc3 mke2fs 1.42.9 (4-Feb-2014) /dev/sdc3 contains a ext4 file system Proceed anyway? (y,n) ... by adding this bit of context: % ./misc/mke2fs -t ext4 /dev/sdc3 mke2fs 1.42.9 (4-Feb-2014) /dev/sdc3 contains a ext4 file system last mounted on /SOX-backups on Mon May 5 08:59:53 2014 Proceed anyway? (y,n) Signed-off-by: "Theodore Ts'o" --- misc/util.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/misc/util.c b/misc/util.c index 15b4ce5..051183e 100644 --- a/misc/util.c +++ b/misc/util.c @@ -105,6 +105,42 @@ void proceed_question(int delay) signal(SIGALRM, SIG_IGN); } +static void print_ext2_info(const char *device) + +{ + struct ext2_super_block *sb; + ext2_filsys fs; + errcode_t retval; + time_t tm; + char buf[80]; + + retval = ext2fs_open2(device, 0, EXT2_FLAG_64BITS, 0, 0, + unix_io_manager, &fs); + if (retval) + return; + sb = fs->super; + + if (sb->s_mtime) { + tm = sb->s_mtime; + if (sb->s_last_mounted[0]) { + memset(buf, 0, sizeof(buf)); + strncpy(buf, sb->s_last_mounted, + sizeof(sb->s_last_mounted)); + printf(_("\tlast mounted on %s on %s"), buf, + ctime(&tm)); + } else + printf(_("\tlast mounted on %s"), ctime(&tm)); + } else if (sb->s_mkfs_time) { + tm = sb->s_mkfs_time; + printf(_("\tcreated on %s"), ctime(&tm)); + } else if (sb->s_wtime) { + tm = sb->s_wtime; + printf(_("\tlast modified on %s"), ctime(&tm)); + } + ext2fs_close(fs); +} + + /* * return 1 if the device looks plausible, creating the file if necessary */ @@ -168,6 +204,8 @@ int check_plausibility(const char *device, int flags, int *ret_is_dev) else printf(_("%s contains a %s file system\n"), device, fs_type); + if (strncmp(fs_type, "ext", 3) == 0) + print_ext2_info(device); free(fs_type); free(fs_label); return 0; -- 1.8.3.1