2011/1/10 Pavel Machek <pavel@xxxxxx>: >> On 07/01/2011 22:59, Tony Luck wrote: >> > On Fri, Jan 7, 2011 at 12:30 PM, Marco Stornelli >> > <marco.stornelli@xxxxxxxxx> wrote: >> >> constraint). About the errors: pramfs does not maintain file data in the >> >> page caches for normal file I/O, so no writeback, the read/write >> >> operation are done with direct io and they are always sync. The data are >> >> write protected in hw when the arch provide this facility (x86 does). >> >> Inode contains a checksum and when there are problems they are marked as >> >> bad. Superblock contains checksum and there is a redundant superblock. >> > >> > But you can still get pramfs inconsistencies if the system crashes at an >> > inopportune moment. E.g. when making files you write the new inode to >> > pramfs, and then you insert the entry into the directory. A crash between >> > these two operations leaves an allocated inode that doesn't appear in >> > any directory. Without a fsck option, it will be hard to see that you have >> > this problem, and your only recovery option is to wipe *all* files by making >> > a new filesystem. >> >> Is it a problem if you lost some logs? However do you expect that fsck >> in this case will drop the inode? > > Ask it the other way around. > > What is persistent filesystem good for when it is only persistent > sometimes? > > You'd be better running ext2 over special block device, it is quite simple. > Ok I can work on it. However can an userspace tool prevent the insert of fs in linux next? Marco -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
