mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull ext3 removal, quota & udf fixes from Jan Kara: "The biggest change in the pull is the removal of ext3 filesystem driver (~28k lines removed). Ext4 driver is a full featured replacement these days and both RH and SUSE use it for several years without issues. Also there are some workarounds in VM & block layer mainly for ext3 which we could eventually get rid of. Other larger change is addition of proper error handling for dquot_initialize(). The rest is small fixes and cleanups" [ I wasn't convinced about the ext3 removal and worried about things falling through the cracks for legacy users, but ext4 maintainers piped up and were all unanimously in favor of removal, and maintaining all legacy ext3 support inside ext4. - Linus ] * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: udf: Don't modify filesystem for read-only mounts quota: remove an unneeded condition ext4: memory leak on error in ext4_symlink() mm/Kconfig: NEED_BOUNCE_POOL: clean-up condition ext4: Improve ext4 Kconfig test block: Remove forced page bouncing under IO fs: Remove ext3 filesystem driver doc: Update doc about journalling layer jfs: Handle error from dquot_initialize() reiserfs: Handle error from dquot_initialize() ocfs2: Handle error from dquot_initialize() ext4: Handle error from dquot_initialize() ext2: Handle error from dquot_initalize() quota: Propagate error from ->acquire_dquot()
266 lines
5.8 KiB
C
266 lines
5.8 KiB
C
/* bounce buffer handling for block devices
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*
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* - Split from highmem.c
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/mm.h>
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#include <linux/export.h>
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#include <linux/swap.h>
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#include <linux/gfp.h>
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#include <linux/bio.h>
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#include <linux/pagemap.h>
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#include <linux/mempool.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/init.h>
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#include <linux/hash.h>
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#include <linux/highmem.h>
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#include <linux/bootmem.h>
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#include <linux/printk.h>
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#include <asm/tlbflush.h>
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#include <trace/events/block.h>
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#define POOL_SIZE 64
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#define ISA_POOL_SIZE 16
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static mempool_t *page_pool, *isa_page_pool;
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#if defined(CONFIG_HIGHMEM) || defined(CONFIG_NEED_BOUNCE_POOL)
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static __init int init_emergency_pool(void)
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{
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#if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG)
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if (max_pfn <= max_low_pfn)
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return 0;
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#endif
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page_pool = mempool_create_page_pool(POOL_SIZE, 0);
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BUG_ON(!page_pool);
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pr_info("pool size: %d pages\n", POOL_SIZE);
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return 0;
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}
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__initcall(init_emergency_pool);
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#endif
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#ifdef CONFIG_HIGHMEM
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/*
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* highmem version, map in to vec
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*/
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static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
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{
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unsigned long flags;
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unsigned char *vto;
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local_irq_save(flags);
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vto = kmap_atomic(to->bv_page);
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memcpy(vto + to->bv_offset, vfrom, to->bv_len);
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kunmap_atomic(vto);
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local_irq_restore(flags);
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}
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#else /* CONFIG_HIGHMEM */
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#define bounce_copy_vec(to, vfrom) \
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memcpy(page_address((to)->bv_page) + (to)->bv_offset, vfrom, (to)->bv_len)
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#endif /* CONFIG_HIGHMEM */
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/*
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* allocate pages in the DMA region for the ISA pool
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*/
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static void *mempool_alloc_pages_isa(gfp_t gfp_mask, void *data)
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{
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return mempool_alloc_pages(gfp_mask | GFP_DMA, data);
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}
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/*
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* gets called "every" time someone init's a queue with BLK_BOUNCE_ISA
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* as the max address, so check if the pool has already been created.
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*/
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int init_emergency_isa_pool(void)
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{
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if (isa_page_pool)
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return 0;
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isa_page_pool = mempool_create(ISA_POOL_SIZE, mempool_alloc_pages_isa,
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mempool_free_pages, (void *) 0);
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BUG_ON(!isa_page_pool);
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pr_info("isa pool size: %d pages\n", ISA_POOL_SIZE);
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return 0;
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}
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/*
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* Simple bounce buffer support for highmem pages. Depending on the
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* queue gfp mask set, *to may or may not be a highmem page. kmap it
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* always, it will do the Right Thing
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*/
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static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
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{
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unsigned char *vfrom;
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struct bio_vec tovec, *fromvec = from->bi_io_vec;
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struct bvec_iter iter;
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bio_for_each_segment(tovec, to, iter) {
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if (tovec.bv_page != fromvec->bv_page) {
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/*
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* fromvec->bv_offset and fromvec->bv_len might have
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* been modified by the block layer, so use the original
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* copy, bounce_copy_vec already uses tovec->bv_len
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*/
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vfrom = page_address(fromvec->bv_page) +
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tovec.bv_offset;
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bounce_copy_vec(&tovec, vfrom);
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flush_dcache_page(tovec.bv_page);
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}
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fromvec++;
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}
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}
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static void bounce_end_io(struct bio *bio, mempool_t *pool)
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{
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struct bio *bio_orig = bio->bi_private;
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struct bio_vec *bvec, *org_vec;
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int i;
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/*
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* free up bounce indirect pages used
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*/
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bio_for_each_segment_all(bvec, bio, i) {
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org_vec = bio_orig->bi_io_vec + i;
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if (bvec->bv_page == org_vec->bv_page)
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continue;
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dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
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mempool_free(bvec->bv_page, pool);
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}
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bio_orig->bi_error = bio->bi_error;
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bio_endio(bio_orig);
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bio_put(bio);
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}
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static void bounce_end_io_write(struct bio *bio)
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{
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bounce_end_io(bio, page_pool);
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}
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static void bounce_end_io_write_isa(struct bio *bio)
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{
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bounce_end_io(bio, isa_page_pool);
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}
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static void __bounce_end_io_read(struct bio *bio, mempool_t *pool)
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{
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struct bio *bio_orig = bio->bi_private;
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if (!bio->bi_error)
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copy_to_high_bio_irq(bio_orig, bio);
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bounce_end_io(bio, pool);
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}
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static void bounce_end_io_read(struct bio *bio)
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{
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__bounce_end_io_read(bio, page_pool);
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}
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static void bounce_end_io_read_isa(struct bio *bio)
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{
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__bounce_end_io_read(bio, isa_page_pool);
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}
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static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
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mempool_t *pool)
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{
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struct bio *bio;
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int rw = bio_data_dir(*bio_orig);
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struct bio_vec *to, from;
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struct bvec_iter iter;
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unsigned i;
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bio_for_each_segment(from, *bio_orig, iter)
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if (page_to_pfn(from.bv_page) > queue_bounce_pfn(q))
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goto bounce;
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return;
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bounce:
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bio = bio_clone_bioset(*bio_orig, GFP_NOIO, fs_bio_set);
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bio_for_each_segment_all(to, bio, i) {
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struct page *page = to->bv_page;
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if (page_to_pfn(page) <= queue_bounce_pfn(q))
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continue;
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to->bv_page = mempool_alloc(pool, q->bounce_gfp);
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inc_zone_page_state(to->bv_page, NR_BOUNCE);
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if (rw == WRITE) {
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char *vto, *vfrom;
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flush_dcache_page(page);
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vto = page_address(to->bv_page) + to->bv_offset;
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vfrom = kmap_atomic(page) + to->bv_offset;
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memcpy(vto, vfrom, to->bv_len);
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kunmap_atomic(vfrom);
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}
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}
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trace_block_bio_bounce(q, *bio_orig);
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bio->bi_flags |= (1 << BIO_BOUNCED);
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if (pool == page_pool) {
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bio->bi_end_io = bounce_end_io_write;
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if (rw == READ)
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bio->bi_end_io = bounce_end_io_read;
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} else {
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bio->bi_end_io = bounce_end_io_write_isa;
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if (rw == READ)
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bio->bi_end_io = bounce_end_io_read_isa;
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}
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bio->bi_private = *bio_orig;
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*bio_orig = bio;
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}
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void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
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{
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mempool_t *pool;
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/*
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* Data-less bio, nothing to bounce
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*/
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if (!bio_has_data(*bio_orig))
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return;
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/*
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* for non-isa bounce case, just check if the bounce pfn is equal
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* to or bigger than the highest pfn in the system -- in that case,
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* don't waste time iterating over bio segments
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*/
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if (!(q->bounce_gfp & GFP_DMA)) {
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if (queue_bounce_pfn(q) >= blk_max_pfn)
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return;
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pool = page_pool;
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} else {
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BUG_ON(!isa_page_pool);
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pool = isa_page_pool;
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}
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/*
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* slow path
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*/
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__blk_queue_bounce(q, bio_orig, pool);
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}
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EXPORT_SYMBOL(blk_queue_bounce);
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