From c8db444820a1e37ebdca38a0210bca85f832214f Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Fri, 22 Nov 2013 19:39:06 -0800 Subject: [PATCH] block: Don't save/copy bvec array anymore Now that drivers have been converted to the bvec_iter primitives, they shouldn't be modifying the biovec anymore and thus saving it is unnecessary - code that was previously making a backup of the bvec array can now just save bio->bi_iter. Signed-off-by: Kent Overstreet Cc: Jens Axboe --- fs/bio.c | 54 +++++++++++++----------------------------------------- 1 file changed, 13 insertions(+), 41 deletions(-) diff --git a/fs/bio.c b/fs/bio.c index 6e42b68ab0ac..9cff939b1bc6 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -967,60 +967,33 @@ void bio_copy_data(struct bio *dst, struct bio *src) EXPORT_SYMBOL(bio_copy_data); struct bio_map_data { - struct bio_vec *iovecs; - struct sg_iovec *sgvecs; int nr_sgvecs; int is_our_pages; + struct sg_iovec sgvecs[]; }; static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio, struct sg_iovec *iov, int iov_count, int is_our_pages) { - memcpy(bmd->iovecs, bio->bi_io_vec, sizeof(struct bio_vec) * bio->bi_vcnt); memcpy(bmd->sgvecs, iov, sizeof(struct sg_iovec) * iov_count); bmd->nr_sgvecs = iov_count; bmd->is_our_pages = is_our_pages; bio->bi_private = bmd; } -static void bio_free_map_data(struct bio_map_data *bmd) -{ - kfree(bmd->iovecs); - kfree(bmd->sgvecs); - kfree(bmd); -} - static struct bio_map_data *bio_alloc_map_data(int nr_segs, unsigned int iov_count, gfp_t gfp_mask) { - struct bio_map_data *bmd; - if (iov_count > UIO_MAXIOV) return NULL; - bmd = kmalloc(sizeof(*bmd), gfp_mask); - if (!bmd) - return NULL; - - bmd->iovecs = kmalloc(sizeof(struct bio_vec) * nr_segs, gfp_mask); - if (!bmd->iovecs) { - kfree(bmd); - return NULL; - } - - bmd->sgvecs = kmalloc(sizeof(struct sg_iovec) * iov_count, gfp_mask); - if (bmd->sgvecs) - return bmd; - - kfree(bmd->iovecs); - kfree(bmd); - return NULL; + return kmalloc(sizeof(struct bio_map_data) + + sizeof(struct sg_iovec) * iov_count, gfp_mask); } -static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs, - struct sg_iovec *iov, int iov_count, +static int __bio_copy_iov(struct bio *bio, struct sg_iovec *iov, int iov_count, int to_user, int from_user, int do_free_page) { int ret = 0, i; @@ -1030,7 +1003,7 @@ static int __bio_copy_iov(struct bio *bio, struct bio_vec *iovecs, bio_for_each_segment_all(bvec, bio, i) { char *bv_addr = page_address(bvec->bv_page); - unsigned int bv_len = iovecs[i].bv_len; + unsigned int bv_len = bvec->bv_len; while (bv_len && iov_idx < iov_count) { unsigned int bytes; @@ -1090,14 +1063,14 @@ int bio_uncopy_user(struct bio *bio) * don't copy into a random user address space, just free. */ if (current->mm) - ret = __bio_copy_iov(bio, bmd->iovecs, bmd->sgvecs, - bmd->nr_sgvecs, bio_data_dir(bio) == READ, + ret = __bio_copy_iov(bio, bmd->sgvecs, bmd->nr_sgvecs, + bio_data_dir(bio) == READ, 0, bmd->is_our_pages); else if (bmd->is_our_pages) bio_for_each_segment_all(bvec, bio, i) __free_page(bvec->bv_page); } - bio_free_map_data(bmd); + kfree(bmd); bio_put(bio); return ret; } @@ -1211,7 +1184,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q, */ if ((!write_to_vm && (!map_data || !map_data->null_mapped)) || (map_data && map_data->from_user)) { - ret = __bio_copy_iov(bio, bio->bi_io_vec, iov, iov_count, 0, 1, 0); + ret = __bio_copy_iov(bio, iov, iov_count, 0, 1, 0); if (ret) goto cleanup; } @@ -1225,7 +1198,7 @@ cleanup: bio_put(bio); out_bmd: - bio_free_map_data(bmd); + kfree(bmd); return ERR_PTR(ret); } @@ -1542,16 +1515,15 @@ static void bio_copy_kern_endio(struct bio *bio, int err) bio_for_each_segment_all(bvec, bio, i) { char *addr = page_address(bvec->bv_page); - int len = bmd->iovecs[i].bv_len; if (read) - memcpy(p, addr, len); + memcpy(p, addr, bvec->bv_len); __free_page(bvec->bv_page); - p += len; + p += bvec->bv_len; } - bio_free_map_data(bmd); + kfree(bmd); bio_put(bio); } -- 2.20.1