On Tuesday, October 29, 2013 09:59:56 Pavel Raiskup wrote: > > #define ST_IS_SPARSE(st) \ > > (ST_NBLOCKS (st) \ > > - < ((st).st_size / ST_NBLOCKSIZE + ((st).st_size % ST_NBLOCKSIZE != 0))) > > + < ((st).st_size / ST_NBLOCKSIZE \ > > + + ((st).st_size % ST_NBLOCKSIZE != 0 \ > > + && (st).st_size / ST_NBLOCKSIZE != 0))) > > May the st.st_size / ST_NBLOCKSIZE be greater than 1 and data still stored > in inode directly? Seems like on ext4 filesystem it is not possible [1] > but does anybody know about exception? > > [1] https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout#Inline_Data
Well, I now recalled somehow relevant Red Hat bug, sorry I have not mentioned it before: https://bugzilla.redhat.com/show_bug.cgi?id=757557 CC'ing fs-devel: The question is whether that ^^^^ is not a bug in filesystem — whether filesystem should not _always_ return to fstat() block count at least 1 if there are at least some data (even if these data are inlined in inode)? Just for catching the context, this thread starts here: http://lists.gnu.org/archive/html/bug-tar/2013-10/msg00030.html If that is not a bug in fs, is there possible to detect that particular file is completely sparse? Pavel
