Re: directory order of files
on reiserfs ls -U show soething like: one two four three On Fri, 29 Jun 2001, Edmund GRIMLEY EVANS wrote: > With Linux ext2, and some other systems, when you create files in a > new directory, the file system remembers their order: > > $ mkdir new > $ cd new > $ touch one two three four > $ ls -U > one two three four > > (1) Is there any standard that says a system should behave this way? > Is there any software that depends on this behaviour? > > (2) Are there Linux file systems that don't work this way? Maybe > someone with a mounted writable reiserfs could do a quick check. > > Please copy replies to me as I am not subscribed. Thanks. > > Edmund > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
On Fri, 29 Jun 2001, Alan Cox wrote: > > With Linux ext2, and some other systems, when you create files in a > > new directory, the file system remembers their order: > > No - it merely seems too. > > > $ touch one two three four > > $ ls -U > > one two three four > > Then try 'rm three; touch five' Moreover, it isn't true even for the case when we create a list of files in empty directory. Example: assuming that /tmp has 1Kb blocks, mkdir /tmp/A cd A touch `perl -e 'print "a"x255'` touch `perl -e 'print "b"x255'` touch `perl -e 'print "c"x255'` touch `perl -e 'print "d"x255'` touch A ls -U will give you (lots of a) (lots of b) (lots of c) A (lots of d). With 4Kb blocks you'll need 16 long names instead of 4 - the effect will be the same. The reason is quite simple - at some point you get no space for long name and it goes into the next directory block, but there's still enough for a short name, so it gets created in the first block. IOW, there's no warranties at all. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
Edmund GRIMLEY EVANS wrote: > > With Linux ext2, and some other systems, when you create files in a > new directory, the file system remembers their order: > > $ mkdir new > $ cd new > $ touch one two three four > $ ls -U > one two three four > > (1) Is there any standard that says a system should behave this way? > Is there any software that depends on this behaviour? Unix filesystem hierarchies are defined to be a partial ordering, not a full ordering. > > (2) Are there Linux file systems that don't work this way? Maybe > someone with a mounted writable reiserfs could do a quick check. > > Please copy replies to me as I am not subscribed. Thanks. bash-2.05# mkdir fu bash-2.05# cd fu bash-2.05# touch one two three four bash-2.05# ls -U one two four three Hans - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
> With Linux ext2, and some other systems, when you create files in a > new directory, the file system remembers their order: No - it merely seems too. > $ touch one two three four > $ ls -U > one two three four Then try 'rm three; touch five' > > (1) Is there any standard that says a system should behave this way? > Is there any software that depends on this behaviour? The order is arbitary. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
directory order of files
With Linux ext2, and some other systems, when you create files in a new directory, the file system remembers their order: $ mkdir new $ cd new $ touch one two three four $ ls -U one two three four (1) Is there any standard that says a system should behave this way? Is there any software that depends on this behaviour? (2) Are there Linux file systems that don't work this way? Maybe someone with a mounted writable reiserfs could do a quick check. Please copy replies to me as I am not subscribed. Thanks. Edmund - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
directory order of files
With Linux ext2, and some other systems, when you create files in a new directory, the file system remembers their order: $ mkdir new $ cd new $ touch one two three four $ ls -U one two three four (1) Is there any standard that says a system should behave this way? Is there any software that depends on this behaviour? (2) Are there Linux file systems that don't work this way? Maybe someone with a mounted writable reiserfs could do a quick check. Please copy replies to me as I am not subscribed. Thanks. Edmund - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
Edmund GRIMLEY EVANS wrote: With Linux ext2, and some other systems, when you create files in a new directory, the file system remembers their order: $ mkdir new $ cd new $ touch one two three four $ ls -U one two three four (1) Is there any standard that says a system should behave this way? Is there any software that depends on this behaviour? Unix filesystem hierarchies are defined to be a partial ordering, not a full ordering. (2) Are there Linux file systems that don't work this way? Maybe someone with a mounted writable reiserfs could do a quick check. Please copy replies to me as I am not subscribed. Thanks. bash-2.05# mkdir fu bash-2.05# cd fu bash-2.05# touch one two three four bash-2.05# ls -U one two four three Hans - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
on reiserfs ls -U show soething like: one two four three On Fri, 29 Jun 2001, Edmund GRIMLEY EVANS wrote: With Linux ext2, and some other systems, when you create files in a new directory, the file system remembers their order: $ mkdir new $ cd new $ touch one two three four $ ls -U one two three four (1) Is there any standard that says a system should behave this way? Is there any software that depends on this behaviour? (2) Are there Linux file systems that don't work this way? Maybe someone with a mounted writable reiserfs could do a quick check. Please copy replies to me as I am not subscribed. Thanks. Edmund - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
With Linux ext2, and some other systems, when you create files in a new directory, the file system remembers their order: No - it merely seems too. $ touch one two three four $ ls -U one two three four Then try 'rm three; touch five' (1) Is there any standard that says a system should behave this way? Is there any software that depends on this behaviour? The order is arbitary. - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: directory order of files
On Fri, 29 Jun 2001, Alan Cox wrote: With Linux ext2, and some other systems, when you create files in a new directory, the file system remembers their order: No - it merely seems too. $ touch one two three four $ ls -U one two three four Then try 'rm three; touch five' Moreover, it isn't true even for the case when we create a list of files in empty directory. Example: assuming that /tmp has 1Kb blocks, mkdir /tmp/A cd A touch `perl -e 'print ax255'` touch `perl -e 'print bx255'` touch `perl -e 'print cx255'` touch `perl -e 'print dx255'` touch A ls -U will give you (lots of a) (lots of b) (lots of c) A (lots of d). With 4Kb blocks you'll need 16 long names instead of 4 - the effect will be the same. The reason is quite simple - at some point you get no space for long name and it goes into the next directory block, but there's still enough for a short name, so it gets created in the first block. IOW, there's no warranties at all. - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
