[f2fs-dev,0/2,v5,RESEND] add ioctl/sysfs to donate file-backed pages

Message

Jaegeuk Kim Jan. 16, 2025, 10:51 p.m. UTC

If users clearly know which file-backed pages to reclaim in system view, they
can use this ioctl() to register in advance and reclaim all at once later.

Change log from v4:
 - fix range handling

Change log from v3:
 - cover partial range

Change log from v2:
 - add more boundary checks
 - de-register the range, if len is zero

Jaegeuk Kim (2):
  f2fs: register inodes which is able to donate pages
  f2fs: add a sysfs entry to request donate file-backed pages

 Documentation/ABI/testing/sysfs-fs-f2fs |  7 +++
 fs/f2fs/debug.c                         |  3 ++
 fs/f2fs/f2fs.h                          | 14 +++++-
 fs/f2fs/file.c                          | 65 +++++++++++++++++++++++++
 fs/f2fs/inode.c                         | 14 ++++++
 fs/f2fs/shrinker.c                      | 27 ++++++++++
 fs/f2fs/super.c                         |  1 +
 fs/f2fs/sysfs.c                         |  8 +++
 include/uapi/linux/f2fs.h               |  7 +++
 9 files changed, 145 insertions(+), 1 deletion(-)