03.01.2017 00:02, Jeff Mahoney пишет: > On 1/2/17 4:55 AM, Andrei Borzenkov wrote: >> I try to understand what exactly is trimmed in case of btrfs. Using >> installation in QEMU I see that host file size is about 9GB, allocated >> size in guest approximately matches it and used space in guest is 7.6GB. >> After some experimenting it looks like host size follows "Device >> allocated" value in "btrfs filesystem usage" which leads me to believe >> trim only considers space outside of allocated chunks. Is it correct? > > It should consider all available space. The code iterates over all > block groups and trims free space and then iterates over free dev > extents, which is all of the unallocated space. > > Which kernel version are you using? This stuff was broken for a while > but was fixed in 4.3. >
openSUSE TW 4.9.0-2-default.
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