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[188.193.20.102]) by smtp.gmail.com with ESMTPSA id cz28sm2111515edb.22.2021.02.24.10.54.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Feb 2021 10:54:00 -0800 (PST) From: Bodo Stroesser To: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, "Martin K. Petersen" , Matthew Wilcox Cc: Bodo Stroesser Subject: [PATCH 2/2] scsi: target: tcmu: Replace radix_tree with XArray Date: Wed, 24 Feb 2021 19:53:35 +0100 Message-Id: <20210224185335.13844-3-bostroesser@gmail.com> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20210224185335.13844-1-bostroesser@gmail.com> References: <20210224185335.13844-1-bostroesser@gmail.com> Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org An attempt from Matthew Wilcox to replace radix-tree usage by XArray in tcmu more than 1 year ago unfortunately got lost. I rebased that work on latest tcmu and tested it. Signed-off-by: Bodo Stroesser --- drivers/target/target_core_user.c | 34 ++++++++++++++++------------------ 1 file changed, 16 insertions(+), 18 deletions(-) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 1fbfb307d5e5..067e00e37673 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -14,7 +14,6 @@ #include #include #include -#include #include #include #include @@ -143,7 +142,7 @@ struct tcmu_dev { uint32_t dbi_max; uint32_t dbi_thresh; unsigned long *data_bitmap; - struct radix_tree_root data_blocks; + struct xarray data_blocks; struct xarray commands; @@ -500,13 +499,13 @@ static inline int tcmu_get_empty_block(struct tcmu_dev *udev, int prev_dbi, int *iov_cnt) { struct page *page; - int ret, dbi; + int dbi; dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh); if (dbi == udev->dbi_thresh) return -1; - page = radix_tree_lookup(&udev->data_blocks, dbi); + page = xa_load(&udev->data_blocks, dbi); if (!page) { if (atomic_add_return(1, &global_db_count) > tcmu_global_max_blocks) @@ -517,8 +516,7 @@ static inline int tcmu_get_empty_block(struct tcmu_dev *udev, if (!page) goto err_alloc; - ret = radix_tree_insert(&udev->data_blocks, dbi, page); - if (ret) + if (xa_store(&udev->data_blocks, dbi, page, GFP_KERNEL)) goto err_insert; } @@ -557,7 +555,7 @@ static int tcmu_get_empty_blocks(struct tcmu_dev *udev, static inline struct page * tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi) { - return radix_tree_lookup(&udev->data_blocks, dbi); + return xa_load(&udev->data_blocks, dbi); } static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd) @@ -1561,7 +1559,7 @@ static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name) timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0); timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0); - INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL); + xa_init(&udev->data_blocks); return &udev->se_dev; } @@ -1585,19 +1583,19 @@ static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd) return -EINVAL; } -static void tcmu_blocks_release(struct radix_tree_root *blocks, - int start, int end) +static void tcmu_blocks_release(struct xarray *blocks, unsigned long first, + unsigned long last) { - int i; + XA_STATE(xas, blocks, first); struct page *page; - for (i = start; i < end; i++) { - page = radix_tree_delete(blocks, i); - if (page) { - __free_page(page); - atomic_dec(&global_db_count); - } + xas_lock(&xas); + xas_for_each(&xas, page, last) { + xas_store(&xas, NULL); + __free_page(page); + atomic_dec(&global_db_count); } + xas_unlock(&xas); } static void tcmu_remove_all_queued_tmr(struct tcmu_dev *udev) @@ -2923,7 +2921,7 @@ static void find_free_blocks(void) unmap_mapping_range(udev->inode->i_mapping, off, 0, 1); /* Release the block pages */ - tcmu_blocks_release(&udev->data_blocks, start, end); + tcmu_blocks_release(&udev->data_blocks, start, end - 1); mutex_unlock(&udev->cmdr_lock); total_freed += end - start;