| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sun, 14 Feb 2010 22:50:45 +0900 From: Jari Sundell <sundell.software@...il.com> To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Extents in spare files on ext4 not being merged http://libtorrent.rakshasa.no/ticket/460#comment:49 Some users of rtorrent reported very high number of extents for files despite the use of posix_fallocate/fallocate on ext4. (3000+ for 250MB file, ) A test program showed that the file was contiguous on disk despite the high number of extents reported by filefrag. (Not sure what kernel versions they used) --- Opening file '/mnt/d1/part1.wmv'. Block size: 4096 File size: 196571350 Block/page count: 47992 1: log 0 bb78 phys 8800 bb77 Size of the file is 187.5 MB and filefrag reports 1505 extents. --- So for some reason the extents aren't getting merged when mmaped regions get sync'ed in a random order to disk. Jari Sundell -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists