On Jun 23, 2003 10:24 +0530, Satish Singhal wrote: > I intend to write a snapshot module for Ext2/3 file-systems. > For that i need to make sure that FS is in consistent state before taking > snapshot. > > For ex. in case of UFS, the superblock has a fs_clean flag which is set to > be FSSTABLE to tell that its in consistent state. (otherwise its set to > FSACTIVE) > > I m not able to find any such information for Ext2/Ext3. > (The superblock does have a s_state flag, but that just tells whether > file-system was cleanly unmounted or not.) > > Pls, let me know if you have any clue/info on this aspect. See ext3_sync_super_lockfs(), ext3_unlockfs(), and the LVM VFS-locking patch. These are used to put the filesystem into a stable state for a short time until the snapshot is created. Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/ _______________________________________________ Ext3-users@redhat.com https://www.redhat.com/mailman/listinfo/ext3-users
