From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Shapovalov Subject: [PATCHv4 01/10] reiser4: block_alloc: add BA_SOME_SPACE flag for grabbing a fixed amount of space. Date: Sat, 13 Dec 2014 00:00:37 +0300 Message-ID: <1418418046-10933-2-git-send-email-intelfx100@gmail.com> References: <1418418046-10933-1-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=8d/awdCmZl7+u7Drxu2CMteR0EeJyQcDEj04gzFmyK0=; b=zS9MEtA7pQbpvTlS+TX34dAsZ1kDAnpzfyD+Newiey+s/UYJ3sbvcBF9g/UOm73i9H yJeh4mvjn/xWx/MR2sk3yGprpBjoFjb9gY2X+FXIeOnVDOQy/m2m6M6Eb6Rz5xPuF3F5 6S5ybiWX/QGCJuICJulBYxsCfD6B+BFSDZvNJWBOtP+LEG0JVdTjpGXg/Q/l94MHdC1x J9xqdREmpuHJHSTMPTkxCyvWFM0OULCSP+oOcgPVrQ11y9GE/RFgjMFLNr9BFuSIOId5 bNgCfKAwaQ6+HQATLx1Sp0jfORqOcHaypZVUDKTUkA5hXVd8sJhICp/KlOwq/c6hMymr gpBQ== In-Reply-To: <1418418046-10933-1-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: 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 | 22 ++++++++++++++++++---- fs/reiser4/block_alloc.h | 5 ++++- 2 files changed, 22 insertions(+), 5 deletions(-) diff --git a/fs/reiser4/block_alloc.c b/fs/reiser4/block_alloc.c index 324b11c..14dd378 100644 --- a/fs/reiser4/block_alloc.c +++ b/fs/reiser4/block_alloc.c @@ -264,7 +264,7 @@ int reiser4_check_block_counters(const struct super_block *super) static int reiser4_grab(reiser4_context * ctx, __u64 count, reiser4_ba_flags_t flags) { - __u64 free_blocks; + __s64 allowed_blocks; int ret = 0, use_reserved = flags & BA_RESERVED; reiser4_super_info_data *sbinfo; @@ -280,10 +280,24 @@ reiser4_grab(reiser4_context * ctx, __u64 count, reiser4_ba_flags_t flags) spin_lock_reiser4_super(sbinfo); - free_blocks = sbinfo->blocks_free; + allowed_blocks = use_reserved ? sbinfo->blocks_free + : sbinfo->blocks_free - sbinfo->blocks_reserved; - if ((use_reserved && free_blocks < count) || - (!use_reserved && free_blocks < count + sbinfo->blocks_reserved)) { + if (flags & BA_SOME_SPACE) { + /* Reserve 25% of all free space */ + if (allowed_blocks <= 0) { + /* No space at all */ + ret = RETERR(-ENOSPC); + goto unlock_and_ret; + } + + count = allowed_blocks >> 2; + if (count == 0) { + /* Less than 4 free blocks */ + count = allowed_blocks; + } + } else if (count > allowed_blocks) { + /* Not enough space */ ret = RETERR(-ENOSPC); goto unlock_and_ret; } 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; -- 2.1.3