c72758f337
To support devices with physical block sizes bigger than 512 bytes we need to ensure proper alignment. This patch adds support for exposing I/O topology characteristics as devices are stacked. logical_block_size is the smallest unit the device can address. physical_block_size indicates the smallest I/O the device can write without incurring a read-modify-write penalty. The io_min parameter is the smallest preferred I/O size reported by the device. In many cases this is the same as the physical block size. However, the io_min parameter can be scaled up when stacking (RAID5 chunk size > physical block size). The io_opt characteristic indicates the optimal I/O size reported by the device. This is usually the stripe width for arrays. The alignment_offset parameter indicates the number of bytes the start of the device/partition is offset from the device's natural alignment. Partition tools and MD/DM utilities can use this to pad their offsets so filesystems start on proper boundaries. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com> |
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| .. | ||
| debugfs-kmemtrace | ||
| debugfs-pktcdvd | ||
| ima_policy | ||
| procfs-diskstats | ||
| sysfs-block | ||
| sysfs-bus-css | ||
| sysfs-bus-pci | ||
| sysfs-bus-umc | ||
| sysfs-bus-usb | ||
| sysfs-bus-usb-devices-usbsevseg | ||
| sysfs-c2port | ||
| sysfs-class | ||
| sysfs-class-bdi | ||
| sysfs-class-pktcdvd | ||
| sysfs-class-regulator | ||
| sysfs-class-usb_host | ||
| sysfs-class-uwb_rc | ||
| sysfs-dev | ||
| sysfs-devices | ||
| sysfs-devices-memory | ||
| sysfs-firmware-acpi | ||
| sysfs-firmware-memmap | ||
| sysfs-firmware-sgi_uv | ||
| sysfs-fs-ext4 | ||
| sysfs-gpio | ||
| sysfs-ibft | ||
| sysfs-kernel-mm | ||
| sysfs-kernel-mm-hugepages | ||
| sysfs-kernel-slab | ||
| sysfs-kernel-uids | ||
| sysfs-ocfs2 | ||
| sysfs-power | ||
| sysfs-profiling | ||
| sysfs-wusb_cbaf | ||