On Tue, May 06, 2014 at 11:32:12AM +0800, Younger Liu wrote: > Hi: > Analyze ext4 filesystem with "debugfs -R "stats" <device>", > Why does not free blocks number change after deleting a big file? > > The big file: > # stat test > file："test" > size：290554084 blocks：567496 IO block：4096 > > before deleting the file "test": > # debugfs -R "stats" /dev/sdb > ... > Inode count: 243593216 > Block count: 1948728320 > Reserved block count: 97436416 > Free blocks: 406830314 > Free inodes: 151667854 > ... > > deleting the file "test" > # debugfs -R "stats" /dev/sdb > ... > Inode count: 243593216 > Block count: 1948728320 > Reserved block count: 97436416 > Free blocks: 406830314 > Free inodes: 151667854 Hi, Seems that you are trying to do this on a mounted partition, and the super block are not dumped to disk after every write/flush. You could use statfs(2) instead of debugfs/stats command, or "mount -o remount /dev/sdb_X_" and after debugfs, this _must_ work only in case you don't have journal. For more information you could look into ext4_commit_super(). > ... > > Younger > thx. > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Respectfully Azat Khuzhin -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
