On 5/18/18 9:43 AM, Mike Fleetwood wrote:
(Sorry for the late reply, work commitments)
...
So after checking, GParted was modified to use the dumpe2fs command to read the superblock to get the file system size for mounted ext* file systems too. https://marc.info/?l=linux-ext4&m=134706477618732&w=2 I see that xfs_db doesn't allow reading the super block of mounted XFS file systems. So for the case of a mounted XFS on full fat block device I guess I'll wait and see how much overhead is subtracted from the statvfs f_blocks figure and make sure GParted accounts for that.
Actually you can, with -r: # mount /dev/sda1 /mnt/test # xfs_db -r -c "sb 0" -c "p dblocks" /dev/sda1 dblocks = 229771264 though I may be giving you rope to hang yourself here ;) It's generally a bit dicey to be reading a mounted block device for any filesystem, as there's no coordination with changes the filesystem may be making while it's mounted. The XFS_IOC_FSGEOMETRY would be a better choice for gathering geometry information for a mounted xfs filesystem. -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
