Package: linux-2.6 Version: 2.6.32-30 Severity: grave The FIEMAP ioctl allows userland to query how file extents are mapped to disk blocks. Some filesystems that implement delayed allocation (at least btrfs and ext4) will wrongly report that the file extents for which blocks have not been allocated are holes in the file (i.e. that no data has been written to them and they are treated as all-zeroes). Any program that relies on this information to optimise file copying may fail to copy data that was recently appended to a file on these types of filesystem.
See <http://lwn.net/Articles/429345/>. Ben. -- System Information: Debian Release: wheezy/sid APT prefers oldstable-proposed-updates APT policy: (500, 'oldstable-proposed-updates'), (500, 'unstable'), (1, 'experimental') Architecture: i386 (x86_64) Kernel: Linux 2.6.37-1-amd64 (SMP w/2 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash
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