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I don't need the entire thing and only interested if it can be coalesced into a single page, but that's better than duplicating the parsing. Signed-off-by: Pavel Begunkov --- io_uring/rsrc.c | 22 ++++++++++++---------- io_uring/rsrc.h | 4 ++++ 2 files changed, 16 insertions(+), 10 deletions(-) diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index adaae8630932..e51e5ddae728 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -626,11 +626,12 @@ static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, return ret; } -static bool io_do_coalesce_buffer(struct page ***pages, int *nr_pages, - struct io_imu_folio_data *data, int nr_folios) +static bool io_coalesce_buffer(struct page ***pages, int *nr_pages, + struct io_imu_folio_data *data) { struct page **page_array = *pages, **new_array = NULL; int nr_pages_left = *nr_pages, i, j; + int nr_folios = data->nr_folios; /* Store head pages only*/ new_array = kvmalloc_array(nr_folios, sizeof(struct page *), @@ -667,15 +668,14 @@ static bool io_do_coalesce_buffer(struct page ***pages, int *nr_pages, return true; } -static bool io_try_coalesce_buffer(struct page ***pages, int *nr_pages, - struct io_imu_folio_data *data) +bool io_check_coalesce_buffer(struct page **page_array, int nr_pages, + struct io_imu_folio_data *data) { - struct page **page_array = *pages; struct folio *folio = page_folio(page_array[0]); unsigned int count = 1, nr_folios = 1; int i; - if (*nr_pages <= 1) + if (nr_pages <= 1) return false; data->nr_pages_mid = folio_nr_pages(folio); @@ -687,7 +687,7 @@ static bool io_try_coalesce_buffer(struct page ***pages, int *nr_pages, * Check if pages are contiguous inside a folio, and all folios have * the same page count except for the head and tail. */ - for (i = 1; i < *nr_pages; i++) { + for (i = 1; i < nr_pages; i++) { if (page_folio(page_array[i]) == folio && page_array[i] == page_array[i-1] + 1) { count++; @@ -715,7 +715,8 @@ static bool io_try_coalesce_buffer(struct page ***pages, int *nr_pages, if (nr_folios == 1) data->nr_pages_head = count; - return io_do_coalesce_buffer(pages, nr_pages, data, nr_folios); + data->nr_folios = nr_folios; + return true; } static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx, @@ -729,7 +730,7 @@ static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx, size_t size; int ret, nr_pages, i; struct io_imu_folio_data data; - bool coalesced; + bool coalesced = false; if (!iov->iov_base) return NULL; @@ -749,7 +750,8 @@ static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx, } /* If it's huge page(s), try to coalesce them into fewer bvec entries */ - coalesced = io_try_coalesce_buffer(&pages, &nr_pages, &data); + if (io_check_coalesce_buffer(pages, nr_pages, &data)) + coalesced = io_coalesce_buffer(&pages, &nr_pages, &data); imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); if (!imu) diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h index 7a4668deaa1a..c8b093584461 100644 --- a/io_uring/rsrc.h +++ b/io_uring/rsrc.h @@ -40,6 +40,7 @@ struct io_imu_folio_data { /* For non-head/tail folios, has to be fully included */ unsigned int nr_pages_mid; unsigned int folio_shift; + unsigned int nr_folios; }; struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type); @@ -66,6 +67,9 @@ int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, unsigned int size, unsigned int type); +bool io_check_coalesce_buffer(struct page **page_array, int nr_pages, + struct io_imu_folio_data *data); + static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data, int index) { -- 2.47.1