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Message-ID: <alpine.LFD.2.00.1405071534070.2128@localhost.localdomain> Date: Wed, 7 May 2014 15:43:09 +0200 (CEST) From: Lukáš Czerner <lczerner@...hat.com> To: "Theodore Ts'o" <tytso@....edu> cc: Ext4 Developers List <linux-ext4@...r.kernel.org> Subject: Re: [PATCH -v2 2/3] mke2fs: print extra information about existing ext2/3/4 file systemsGjj On Wed, 7 May 2014, Theodore Ts'o wrote: > Date: Wed, 7 May 2014 08:39:13 -0400 > From: Theodore Ts'o <tytso@....edu> > To: Lukáš Czerner <lczerner@...hat.com> > Cc: Ext4 Developers List <linux-ext4@...r.kernel.org> > Subject: Re: [PATCH -v2 2/3] mke2fs: print extra information about existing > ext2/3/4 file systemsG > > On Wed, May 07, 2014 at 10:15:56AM +0200, Lukáš Czerner wrote: > > > Yes, that's a cut and paste typo, thanks for spotting it. It should > > > have been: > > > > > > } else if (sb->s_mkfs_time) { > > > tm = sb->s_mkfs_time; > > > printf(_("\tcreated on %s"), ctime(&tm)); > > > } else if (sb->s_mtime) { <======== > > > > But you're already checking for sb->s_mtime in the first condition, > > am I missing something ? > > The basic idea is to give one bit of context, and whatever would be > the most useful. In order of preference, it's: > > 1) Last mount directory (if available) and last mount time > 2) Time file system was created > 3) Time file system was written > > #2 or #3 is only needed if the file system was never mounted. > > #3 is only needed for those file systems that (a) were never mounted, > (b) was modified/filled via e2tools or debugfs. (Or Windows FS SDK > based hacks, etc.) > > - Ted > I understand that, but here is what is in your patch: + 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_mkfs_time) { + tm = sb->s_mtime; + printf(_("\tlast modified on %s"), ctime(&tm)); + } Now you're saying that the last condition should really be } else if (sb->s_mtime) { <======== But that does not make sense because it's the same as the first condition, so it would either never get there, or never be true. So it really should be } else if (sb->s_wtime) { so the whole thing should look like: + 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)); + } Also I wonder whether we need to use 'tm' variable, can't we use the sb->s_*time directly ? But that's nitpicking. Thanks! -Lukas
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