From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Shapovalov Subject: [RFC] [PATCH 1/7] reiser4: block_alloc: add BA_SOME_SPACE flag for grabbing a fixed amount of space. Date: Sun, 17 Aug 2014 19:43:20 +0400 Message-ID: <1408290206-7427-2-git-send-email-intelfx100@gmail.com> References: <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:in-reply-to:references; bh=bWxj6zzt6njtHZiL4qOCYsIxycM4MUC0ZZeeZu0lTWE=; b=opKZDxGNKpG0VBBaP4kE4yv7z2k40uXYXG0+8AGXIM5UarPBlC6ascGCqrWccqEOvB caHSPD1h05n8Jc/ByI1IWnsWwFo3OUlvyvRsXHhZ2ohHywp+Zz6GfIUJeYL3XLxGE5tv gvAYELFyaMWJ62k4/Xz24Qa8TcAQzwO865+TMtuHSRGYHUAMUztOaFhqh4RHD3947MuY g/BsQepYhIK/tx94iSrv/clnG5jzxYVt6fn95mgrQwZuvQ08b/0DfMN4h5/lmoBXg3tc b4H6qarY5vY7w+fGCqYbVkTaSNwAYT8QHrR2ivnMYCQ0jc02XnJ5AvtD8Uc6WZ3r34jb OXbg== In-Reply-To: <1408290206-7427-1-git-send-email-intelfx100@gmail.com> 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 is used for FITRIM ioctl which will iteratively grab, allocate and trim disk space bit by bit to avoid starving the rest of system. Signed-off-by: Ivan Shapovalov --- fs/reiser4/block_alloc.c | 6 ++++++ fs/reiser4/block_alloc.h | 5 ++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/reiser4/block_alloc.c b/fs/reiser4/block_alloc.c index d3d730c..8797b43 100644 --- a/fs/reiser4/block_alloc.c +++ b/fs/reiser4/block_alloc.c @@ -276,6 +276,12 @@ reiser4_grab(reiser4_context * ctx, __u64 count, reiser4_ba_flags_t flags) free_blocks = sbinfo->blocks_free; + if (flags & BA_SOME_SPACE) { + /* Reserve 25% of all free space. */ + count = free_blocks; + do_div(count, 4); + } + if ((use_reserved && free_blocks < count) || (!use_reserved && free_blocks < count + sbinfo->blocks_reserved)) { ret = RETERR(-ENOSPC); diff --git a/fs/reiser4/block_alloc.h b/fs/reiser4/block_alloc.h index a4e98af..bfc6be9 100644 --- a/fs/reiser4/block_alloc.h +++ b/fs/reiser4/block_alloc.h @@ -79,7 +79,10 @@ enum reiser4_ba_flags { BA_FORCE = (1 << 5), /* use default start value for free blocks search. */ - BA_USE_DEFAULT_SEARCH_START = (1 << 6) + BA_USE_DEFAULT_SEARCH_START = (1 << 6), + + /* reserve some fixed amount of space */ + BA_SOME_SPACE = (1 << 7), }; typedef enum reiser4_ba_flags reiser4_ba_flags_t; -- 2.0.4