On Feb 12 22:34, Christian Franke via Cygwin wrote: > Corinna Vinschen via Cygwin wrote: > > On Feb 12 17:32, Cedric Blancher via Cygwin wrote: > > > Good afternoon! > > > > > > Is copying sparse files broken in 3.6.0-0.362.g68c13dc92f65.x86_64? > > > > > > cp --version > > > cp (GNU coreutils) 9.5 > > > Packaged by Cygwin (9.5-1 > > > > > > Checklist: > > > - Volume has FILE_SUPPORTS_SPARSE_FILES > > > - Cygwin mount has "sparse" option (mount Y: -o sparse,exec /cygdrive/y) > > Do all mount points below /cygdrive have 'sparse,exec' set? > > If not, this may not work because different mount options for individual > /cygdrive/s are not supported (AFIAK). > > > > > - source file has FILE_ATTRIBUTE_SPARSE_FILE set > > > > > > But cp --sparse=auto ... or any other combination of --sparse does > > > copy holes, i.e. turns 500GB of hole into 500GB of data (zero bytes). > > > > > > echo "hello sparse file\n" >testcase17_sparse_begins_with_data && dd > > > if=/dev/null of=testcase17_sparse_begins_with_data oflag=append bs=1 > > > count=1 seek=$((65536*512)) && echo "endoffile" > > > > > testcase17_sparse_begins_with_data > > Works for me: > > > > $ uname -r > > 3.6.0-0.362.g68c13dc92f65.x86_64 > > > > $ pwd > > /home/corinna/tmp > > > > $ mount | grep tmp > > C:/cygwin64/home/corinna/tmp on /home/corinna/tmp type ntfs > > (binary,sparse,user,bind) > > This mount is independent from /cygdrive. That may make the difference.
You're right! I didn't notice this. This: > - Cygwin mount has "sparse" option (mount Y: -o sparse,exec /cygdrive/y) doesn't work: $ cat /etc/fstab Y: /mnt/y binary,posix=0,sparse 0 0 none /mnt cygdrive binary,posix=0 0 0 $ mount [...] Y: on /mnt/y type ntfs (binary,posix=0,noumount,auto) As you can see, the options for drive Y are ignored and the options for the cygdrive prefix are used. This is even documented in a special note in https://cygwin.com/cygwin-ug-net/using.html#cygdrive Thanks for pointing this out, Christian! Corinna -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
