Hello Ming, > During running e4defrag, I am writing/reading data on file system. > Is it safe to use e4defrag? I mean if power failure happens, is there any possibility of data loss or defragging file corruption? # I have received same question from Peng and I already answered him. Anyway; The journal feature and kernel internal locks protect data corruption against power failure and R/W confliction on ext4, so you don't need to worry about that. For more detail about journal, please check the following web page. https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout#Journal_.28jbd2.29 Regards, Akira Fujita (2013/10/29 2:13), Ming Lei wrote: > Hi, > > I am using e4defrag to defrag running ext4 online. > During running e4defrag, I am writing/reading data on file system. > Is it safe to use e4defrag? I mean if power failure happens, is there any possibility of data loss or defragging file corruption? > If there is possibility of defragging file corruption after power failure, can fsck fix it? > > Thank you very much. > Peng > > -- > 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 > -- 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
