From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Shapovalov Subject: [RFC] [PATCH 0/7] reiser4: batch discard support (FITRIM ioctl): initial implementation. Date: Sun, 17 Aug 2014 19:43:19 +0400 Message-ID: <1408290206-7427-1-git-send-email-intelfx100@gmail.com> Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id; bh=HO9sP/aqQ40lHWRQzmluk3S+ulaP+UPjoGbKMfnAcs0=; b=NX7Iwtridq+K7HpPs78erRKfk+4rhmpPG5uZpCjWIOOnqEBFV6cJgncVMxoEXHLDTo EbjzExQ16z/GoxOEoZLI+ZLvJBXdgpaFayNSa7XN9ujDM84G29pfiW894wPwIH4pRHjR qmJfCQ53rmBXnG0BzU0sCQ0qxtDXGH0tm4FPpGZFeOoLbxcaVLSjF6QNmtyQ3zg7r1EI RwT2A+DCrGBicrwS1yHKR0LM3ygEEIlD0SVOyiqvBRRiJ7PJaE3CP45BE8EMEZeGIuLy XHdo430I1vtvudTbg1+ILu9cmd2b2zmS9lyq046KzjelYgcCAhCRu/CvgRMk/XymIPjF lVAg== Sender: reiserfs-devel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: reiserfs-devel@vger.kernel.org Cc: edward.shishkin@gmail.com, Ivan Shapovalov This patch series implements FITRIM ioctl support in reiser4. The FITRIM ioctl is supposed to be applied to any directory inside the target filesystem. At least, this can be deduced from `fstrim` utility behavior on mainstream filesystems (e. g. ext2/3/4). The idea of implementation is per Edward's advices: FITRIM handler iteratively grabs a portion of disk space, sequentially allocates extents within grabbed space and commits the resulting atom. This way we avoid starving concurrent processes of the disk space. This process is repeated until the partition has been fully scanned and processed. Points I'm really uncertain of: - grabbing fixed amount of space (new BA_SOME_SPACE flag, grabs 25% of disk space) - creation of empty atoms (reiser4_create_atom()) - handling of empty atoms in commit_current_atom() Ivan Shapovalov (7): reiser4: block_alloc: add BA_SOME_SPACE flag for grabbing a fixed amount of space. reiser4: block_alloc: add a "forward" parameter to reiser4_blocknr_hint to allocate blocks only in forward direction. reiser4: txnmgr: free allocated but unneeded atom in atom_begin_and_assign_to_txnh(). reiser4: txnmgr: add reiser4_create_atom() which creates an empty atom without capturing any nodes. reiser4: txnmgr: call reiser4_post_write_back_hook() for empty atoms. reiser4: batch discard support: add a dummy FITRIM ioctl handler for directories. reiser4: batch discard support: actually implement the FITRIM ioctl handler. fs/reiser4/block_alloc.c | 6 ++ fs/reiser4/block_alloc.h | 10 ++- fs/reiser4/plugin/dir/dir.h | 2 + fs/reiser4/plugin/file_ops.c | 62 ++++++++++++++++++ fs/reiser4/plugin/object.c | 6 +- fs/reiser4/plugin/space/bitmap.c | 3 +- fs/reiser4/super_ops.c | 131 +++++++++++++++++++++++++++++++++++++++ fs/reiser4/txnmgr.c | 51 ++++++++++----- fs/reiser4/txnmgr.h | 2 + 9 files changed, 252 insertions(+), 21 deletions(-) -- 2.0.4