From 3c0f26ff9d040c6193b33689bbc03103854dba4d Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 28 Nov 2017 12:40:35 -0600 Subject: tcmu: fix free block calculation The blocks_left calculation does not account for free blocks between 0 and thresh, so we could be queueing/waiting when there are enough blocks free. This has us add in the blocks between 0 and thresh as well as at the end from thresh to DATA_BLOCK_BITS. Signed-off-by: Mike Christie Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_user.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'drivers/target/target_core_user.c') diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 965f462eaa22..5d1daea51079 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -637,7 +637,7 @@ static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd, static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh) { - return DATA_BLOCK_SIZE * (thresh - bitmap_weight(bitmap, thresh)); + return thresh - bitmap_weight(bitmap, thresh); } /* @@ -677,8 +677,9 @@ static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, /* try to check and get the data blocks as needed */ space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh); - if (space < data_needed) { - unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh; + if ((space * DATA_BLOCK_SIZE) < data_needed) { + unsigned long blocks_left = DATA_BLOCK_BITS - udev->dbi_thresh + + space; unsigned long grow; if (blocks_left < blocks_needed) { -- cgit v1.2.3-59-g8ed1b