[PATCH v3 0/2] nilfs2: add support for FITRIM ioctl

[Andreas Rohner]

Hi,

This patch adds support for the FITRIM ioctl, which allows user space
tools like fstrim to issue TRIM/DISCARD requests to the underlying
device. It takes a fstrim_range structure as a parameter and for every
clean segment in the specified range the function blkdev_issue_discard
is called. The range is truncated to file system block boundaries.

I tested it with a 32 bit and 64 bit kernel. On the 32 bit system
CONFIG_LBDAF was disabled so that sector_t was 32 bit.

Best regards,
Andreas Rohner

---
v2->v3 (based on review by Ryusuke Konishi)
* Fix integer overflow
* Round range to block boundary instead of sector boundary
* Move range check to nilfs_sufile_trim_fs()
v1->v2 (based on review by Ryusuke Konishi)
* Remove upper limit of minlen
* Add check for minlen
* Round range to sector boundary instead of segment boundary
* Fix minor bug
* Use kmap_atomic instead of kmap
* Move input checks to ioctl.c
* Use nilfs_sufile_segment_usages_in_block()
--
Andreas Rohner (2):
nilfs2: add nilfs_sufile_trim_fs to trim clean segs
nilfs2: add FITRIM ioctl support for nilfs2

fs/nilfs2/ioctl.c | 46 +++++++++++++++++
fs/nilfs2/sufile.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nilfs2/sufile.h | 1 +
3 files changed, 194 insertions(+)