[PATCH v4 0/2] nilfs2: add support for FITRIM ioctl

[Andreas Rohner <andreas.rohner-hi6Y0CQ0nG0@public.gmane.org>]

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

---
v3->v4 (based on review by Ryusuke Konishi)
 * Fix integer overflow
 * Add comment
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  |  45 ++++++++++++++++
 fs/nilfs2/sufile.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/nilfs2/sufile.h |   1 +
 3 files changed, 198 insertions(+)

-- 
1.9.0

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