/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2012, 2017, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/osd/osd_io.c * * body operations * * Author: Nikita Danilov * Author: Alex Zhuravlev * */ /* prerequisite for linux/xattr.h */ #include /* prerequisite for linux/xattr.h */ #include #include #include /* * struct OBD_{ALLOC,FREE}*() * OBD_FAIL_CHECK */ #include #include "osd_internal.h" /* ext_depth() */ #include static inline bool osd_use_page_cache(struct osd_device *d) { /* do not use pagecache if write and read caching are disabled */ if (d->od_writethrough_cache + d->od_read_cache == 0) return false; /* use pagecache by default */ return true; } static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf, int rw, int line, int pages) { int blocks, i; LASSERTF(iobuf->dr_elapsed_valid == 0, "iobuf %p, reqs %d, rw %d, line %d\n", iobuf, atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw, iobuf->dr_init_at); LASSERT(pages <= PTLRPC_MAX_BRW_PAGES); init_waitqueue_head(&iobuf->dr_wait); atomic_set(&iobuf->dr_numreqs, 0); iobuf->dr_npages = 0; iobuf->dr_error = 0; iobuf->dr_dev = d; iobuf->dr_frags = 0; iobuf->dr_elapsed = ktime_set(0, 0); /* must be counted before, so assert */ iobuf->dr_rw = rw; iobuf->dr_init_at = line; blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits); if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) { LASSERT(iobuf->dr_pg_buf.lb_len >= pages * sizeof(iobuf->dr_pages[0])); return 0; } /* start with 1MB for 4K blocks */ i = 256; while (i <= PTLRPC_MAX_BRW_PAGES && i < pages) i <<= 1; CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n", (unsigned)(pages * sizeof(iobuf->dr_pages[0])), i, pages); pages = i; blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits); iobuf->dr_max_pages = 0; CDEBUG(D_OTHER, "realloc %u for %u blocks\n", (unsigned)(blocks * sizeof(iobuf->dr_blocks[0])), blocks); lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0])); iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf; if (unlikely(iobuf->dr_blocks == NULL)) return -ENOMEM; lu_buf_realloc(&iobuf->dr_pg_buf, pages * sizeof(iobuf->dr_pages[0])); iobuf->dr_pages = iobuf->dr_pg_buf.lb_buf; if (unlikely(iobuf->dr_pages == NULL)) return -ENOMEM; lu_buf_realloc(&iobuf->dr_lnb_buf, pages * sizeof(iobuf->dr_lnbs[0])); iobuf->dr_lnbs = iobuf->dr_lnb_buf.lb_buf; if (unlikely(iobuf->dr_lnbs == NULL)) return -ENOMEM; iobuf->dr_max_pages = pages; return 0; } #define osd_init_iobuf(dev, iobuf, rw, pages) \ __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages) static void osd_iobuf_add_page(struct osd_iobuf *iobuf, struct niobuf_local *lnb) { LASSERT(iobuf->dr_npages < iobuf->dr_max_pages); iobuf->dr_pages[iobuf->dr_npages] = lnb->lnb_page; iobuf->dr_lnbs[iobuf->dr_npages] = lnb; iobuf->dr_npages++; } void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf) { int rw = iobuf->dr_rw; if (iobuf->dr_elapsed_valid) { iobuf->dr_elapsed_valid = 0; LASSERT(iobuf->dr_dev == d); LASSERT(iobuf->dr_frags > 0); lprocfs_oh_tally(&d->od_brw_stats. hist[BRW_R_DIO_FRAGS+rw], iobuf->dr_frags); lprocfs_oh_tally_log2(&d->od_brw_stats.hist[BRW_R_IO_TIME+rw], ktime_to_ms(iobuf->dr_elapsed)); } } #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG static void dio_complete_routine(struct bio *bio) { int error = bio->bi_status; #else static void dio_complete_routine(struct bio *bio, int error) { #endif struct osd_iobuf *iobuf = bio->bi_private; int iter; struct bio_vec *bvl; /* CAVEAT EMPTOR: possibly in IRQ context * DO NOT record procfs stats here!!! */ if (unlikely(iobuf == NULL)) { CERROR("***** bio->bi_private is NULL! This should never " "happen. Normally, I would crash here, but instead I " "will dump the bio contents to the console. Please " "report this to , along " "with any interesting messages leading up to this point " "(like SCSI errors, perhaps). Because bi_private is " "NULL, I can't wake up the thread that initiated this " "IO - you will probably have to reboot this node.\n"); CERROR("bi_next: %p, bi_flags: %lx, " __stringify(bi_opf) ": %x, bi_vcnt: %d, bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, bi_private: %p\n", bio->bi_next, (unsigned long)bio->bi_flags, (unsigned int)bio->bi_opf, bio->bi_vcnt, bio_idx(bio), bio_sectors(bio) << 9, bio->bi_end_io, atomic_read(&bio->__bi_cnt), bio->bi_private); return; } /* the check is outside of the cycle for performance reason -bzzz */ if (!bio_data_dir(bio)) { bio_for_each_segment_all(bvl, bio, iter) { if (likely(error == 0)) SetPageUptodate(bvl_to_page(bvl)); LASSERT(PageLocked(bvl_to_page(bvl))); } atomic_dec(&iobuf->dr_dev->od_r_in_flight); } else { atomic_dec(&iobuf->dr_dev->od_w_in_flight); } /* any real error is good enough -bzzz */ if (error != 0 && iobuf->dr_error == 0) iobuf->dr_error = error; /* * set dr_elapsed before dr_numreqs turns to 0, otherwise * it's possible that service thread will see dr_numreqs * is zero, but dr_elapsed is not set yet, leading to lost * data in this processing and an assertion in a subsequent * call to OSD. */ if (atomic_read(&iobuf->dr_numreqs) == 1) { ktime_t now = ktime_get(); iobuf->dr_elapsed = ktime_sub(now, iobuf->dr_start_time); iobuf->dr_elapsed_valid = 1; } if (atomic_dec_and_test(&iobuf->dr_numreqs)) wake_up(&iobuf->dr_wait); /* Completed bios used to be chained off iobuf->dr_bios and freed in * filter_clear_dreq(). It was then possible to exhaust the biovec-256 * mempool when serious on-disk fragmentation was encountered, * deadlocking the OST. The bios are now released as soon as complete * so the pool cannot be exhausted while IOs are competing. bug 10076 */ bio_put(bio); } static void record_start_io(struct osd_iobuf *iobuf, int size) { struct osd_device *osd = iobuf->dr_dev; struct obd_histogram *h = osd->od_brw_stats.hist; iobuf->dr_frags++; atomic_inc(&iobuf->dr_numreqs); if (iobuf->dr_rw == 0) { atomic_inc(&osd->od_r_in_flight); lprocfs_oh_tally(&h[BRW_R_RPC_HIST], atomic_read(&osd->od_r_in_flight)); lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size); } else if (iobuf->dr_rw == 1) { atomic_inc(&osd->od_w_in_flight); lprocfs_oh_tally(&h[BRW_W_RPC_HIST], atomic_read(&osd->od_w_in_flight)); lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size); } else { LBUG(); } } static void osd_submit_bio(int rw, struct bio *bio) { LASSERTF(rw == 0 || rw == 1, "%x\n", rw); #ifdef HAVE_SUBMIT_BIO_2ARGS submit_bio(rw ? WRITE : READ, bio); #else bio->bi_opf |= rw; submit_bio(bio); #endif } static int can_be_merged(struct bio *bio, sector_t sector) { if (bio == NULL) return 0; return bio_end_sector(bio) == sector ? 1 : 0; } #if IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) /* * This function will change the data written, thus it should only be * used when checking data integrity feature */ static void bio_integrity_fault_inject(struct bio *bio) { struct bio_vec *bvec; int i; void *kaddr; char *addr; bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; kaddr = kmap(page); addr = kaddr; *addr = ~(*addr); kunmap(page); break; } } static int bio_dif_compare(__u16 *expected_guard_buf, void *bio_prot_buf, unsigned int sectors, int tuple_size) { __u16 *expected_guard; __u16 *bio_guard; int i; expected_guard = expected_guard_buf; for (i = 0; i < sectors; i++) { bio_guard = (__u16 *)bio_prot_buf; if (*bio_guard != *expected_guard) { CERROR("unexpected guard tags on sector %d " "expected guard %u, bio guard " "%u, sectors %u, tuple size %d\n", i, *expected_guard, *bio_guard, sectors, tuple_size); return -EIO; } expected_guard++; bio_prot_buf += tuple_size; } return 0; } static int osd_bio_integrity_compare(struct bio *bio, struct block_device *bdev, struct osd_iobuf *iobuf, int index) { struct blk_integrity *bi = bdev_get_integrity(bdev); struct bio_integrity_payload *bip = bio->bi_integrity; struct niobuf_local *lnb; unsigned short sector_size = blk_integrity_interval(bi); void *bio_prot_buf = page_address(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; struct bio_vec *bv; sector_t sector = bio_start_sector(bio); unsigned int i, sectors, total; __u16 *expected_guard; int rc; total = 0; bio_for_each_segment_all(bv, bio, i) { lnb = iobuf->dr_lnbs[index]; expected_guard = lnb->lnb_guards; sectors = bv->bv_len / sector_size; if (lnb->lnb_guard_rpc) { rc = bio_dif_compare(expected_guard, bio_prot_buf, sectors, bi->tuple_size); if (rc) return rc; } sector += sectors; bio_prot_buf += sectors * bi->tuple_size; total += sectors * bi->tuple_size; LASSERT(total <= bip_size(bio->bi_integrity)); index++; } return 0; } static int osd_bio_integrity_handle(struct osd_device *osd, struct bio *bio, struct osd_iobuf *iobuf, int start_page_idx, bool fault_inject, bool integrity_enabled) { struct super_block *sb = osd_sb(osd); integrity_gen_fn *generate_fn = NULL; integrity_vrfy_fn *verify_fn = NULL; int rc; ENTRY; if (!integrity_enabled) RETURN(0); rc = osd_get_integrity_profile(osd, &generate_fn, &verify_fn); if (rc) RETURN(rc); rc = bio_integrity_prep_fn(bio, generate_fn, verify_fn); if (rc) RETURN(rc); /* Verify and inject fault only when writing */ if (iobuf->dr_rw == 1) { if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_CMP))) { rc = osd_bio_integrity_compare(bio, sb->s_bdev, iobuf, start_page_idx); if (rc) RETURN(rc); } if (unlikely(fault_inject)) bio_integrity_fault_inject(bio); } RETURN(0); } #ifdef HAVE_BIO_INTEGRITY_PREP_FN # ifdef HAVE_BIO_ENDIO_USES_ONE_ARG static void dio_integrity_complete_routine(struct bio *bio) # else static void dio_integrity_complete_routine(struct bio *bio, int error) # endif { struct osd_bio_private *bio_private = bio->bi_private; bio->bi_private = bio_private->obp_iobuf; osd_dio_complete_routine(bio, error); OBD_FREE_PTR(bio_private); } #endif /* HAVE_BIO_INTEGRITY_PREP_FN */ #else /* !CONFIG_BLK_DEV_INTEGRITY */ #define osd_bio_integrity_handle(osd, bio, iobuf, start_page_idx, \ fault_inject, integrity_enabled) 0 #endif /* CONFIG_BLK_DEV_INTEGRITY */ static int osd_bio_init(struct bio *bio, struct osd_iobuf *iobuf, bool integrity_enabled, int start_page_idx, struct osd_bio_private **pprivate) { ENTRY; *pprivate = NULL; #ifdef HAVE_BIO_INTEGRITY_PREP_FN if (integrity_enabled) { struct osd_bio_private *bio_private = NULL; OBD_ALLOC_GFP(bio_private, sizeof(*bio_private), GFP_NOIO); if (bio_private == NULL) RETURN(-ENOMEM); bio->bi_end_io = dio_integrity_complete_routine; bio->bi_private = bio_private; bio_private->obp_start_page_idx = start_page_idx; bio_private->obp_iobuf = iobuf; *pprivate = bio_private; } else #endif { bio->bi_end_io = dio_complete_routine; bio->bi_private = iobuf; } RETURN(0); } static int osd_do_bio(struct osd_device *osd, struct inode *inode, struct osd_iobuf *iobuf) { int blocks_per_page = PAGE_SIZE >> inode->i_blkbits; struct page **pages = iobuf->dr_pages; int npages = iobuf->dr_npages; sector_t *blocks = iobuf->dr_blocks; int total_blocks = npages * blocks_per_page; struct super_block *sb = inode->i_sb; int sector_bits = sb->s_blocksize_bits - 9; unsigned int blocksize = sb->s_blocksize; struct block_device *bdev = sb->s_bdev; struct osd_bio_private *bio_private = NULL; struct bio *bio = NULL; int bio_start_page_idx; struct page *page; unsigned int page_offset; sector_t sector; int nblocks; int block_idx; int page_idx; int i; int rc = 0; bool fault_inject; bool integrity_enabled; DECLARE_PLUG(plug); ENTRY; fault_inject = OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT); LASSERT(iobuf->dr_npages == npages); integrity_enabled = bdev_integrity_enabled(bdev, iobuf->dr_rw); osd_brw_stats_update(osd, iobuf); iobuf->dr_start_time = ktime_get(); blk_start_plug(&plug); for (page_idx = 0, block_idx = 0; page_idx < npages; page_idx++, block_idx += blocks_per_page) { page = pages[page_idx]; LASSERT(block_idx + blocks_per_page <= total_blocks); for (i = 0, page_offset = 0; i < blocks_per_page; i += nblocks, page_offset += blocksize * nblocks) { nblocks = 1; if (blocks[block_idx + i] == 0) { /* hole */ LASSERTF(iobuf->dr_rw == 0, "page_idx %u, block_idx %u, i %u\n", page_idx, block_idx, i); memset(kmap(page) + page_offset, 0, blocksize); kunmap(page); continue; } sector = (sector_t)blocks[block_idx + i] << sector_bits; /* Additional contiguous file blocks? */ while (i + nblocks < blocks_per_page && (sector + (nblocks << sector_bits)) == ((sector_t)blocks[block_idx + i + nblocks] << sector_bits)) nblocks++; if (bio != NULL && can_be_merged(bio, sector) && bio_add_page(bio, page, blocksize * nblocks, page_offset) != 0) continue; /* added this frag OK */ if (bio != NULL) { struct request_queue *q = bio_get_queue(bio); unsigned int bi_size = bio_sectors(bio) << 9; /* Dang! I have to fragment this I/O */ CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) " "sectors %d(%d) psg %d(%d) hsg %d(%d)\n", bi_size, bio->bi_vcnt, bio->bi_max_vecs, bio_sectors(bio), queue_max_sectors(q), bio->bi_phys_segments, queue_max_phys_segments(q), 0, queue_max_hw_segments(q)); rc = osd_bio_integrity_handle(osd, bio, iobuf, bio_start_page_idx, fault_inject, integrity_enabled); if (rc) { bio_put(bio); goto out; } record_start_io(iobuf, bi_size); osd_submit_bio(iobuf->dr_rw, bio); } bio_start_page_idx = page_idx; /* allocate new bio */ bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES, (npages - page_idx) * blocks_per_page)); if (bio == NULL) { CERROR("Can't allocate bio %u*%u = %u pages\n", (npages - page_idx), blocks_per_page, (npages - page_idx) * blocks_per_page); rc = -ENOMEM; goto out; } bio_set_dev(bio, bdev); bio_set_sector(bio, sector); bio->bi_opf = iobuf->dr_rw ? WRITE : READ; rc = osd_bio_init(bio, iobuf, integrity_enabled, bio_start_page_idx, &bio_private); if (rc) { bio_put(bio); goto out; } rc = bio_add_page(bio, page, blocksize * nblocks, page_offset); LASSERT(rc != 0); } } if (bio != NULL) { rc = osd_bio_integrity_handle(osd, bio, iobuf, bio_start_page_idx, fault_inject, integrity_enabled); if (rc) { bio_put(bio); goto out; } record_start_io(iobuf, bio_sectors(bio) << 9); osd_submit_bio(iobuf->dr_rw, bio); rc = 0; } out: blk_finish_plug(&plug); /* in order to achieve better IO throughput, we don't wait for writes * completion here. instead we proceed with transaction commit in * parallel and wait for IO completion once transaction is stopped * see osd_trans_stop() for more details -bzzz */ if (iobuf->dr_rw == 0 || fault_inject) { wait_event(iobuf->dr_wait, atomic_read(&iobuf->dr_numreqs) == 0); osd_fini_iobuf(osd, iobuf); } if (rc == 0) { rc = iobuf->dr_error; } else { if (bio_private) OBD_FREE_PTR(bio_private); } RETURN(rc); } static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages, struct niobuf_local *lnb) { ENTRY; *nrpages = 0; while (len > 0) { int poff = offset & (PAGE_SIZE - 1); int plen = PAGE_SIZE - poff; if (plen > len) plen = len; lnb->lnb_file_offset = offset; lnb->lnb_page_offset = poff; lnb->lnb_len = plen; /* lnb->lnb_flags = rnb->rnb_flags; */ lnb->lnb_flags = 0; lnb->lnb_page = NULL; lnb->lnb_rc = 0; lnb->lnb_guard_rpc = 0; lnb->lnb_guard_disk = 0; LASSERTF(plen <= len, "plen %u, len %lld\n", plen, (long long) len); offset += plen; len -= plen; lnb++; (*nrpages)++; } RETURN(0); } static struct page *osd_get_page(const struct lu_env *env, struct dt_object *dt, loff_t offset, gfp_t gfp_mask) { struct osd_thread_info *oti = osd_oti_get(env); struct inode *inode = osd_dt_obj(dt)->oo_inode; struct osd_device *d = osd_obj2dev(osd_dt_obj(dt)); struct page *page; int cur = oti->oti_dio_pages_used; LASSERT(inode); if (osd_use_page_cache(d)) { page = find_or_create_page(inode->i_mapping, offset >> PAGE_SHIFT, gfp_mask); if (likely(page)) LASSERT(!test_bit(PG_private_2, &page->flags)); else lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1); } else { LASSERT(oti->oti_dio_pages); if (unlikely(!oti->oti_dio_pages[cur])) { LASSERT(cur < PTLRPC_MAX_BRW_PAGES); page = alloc_page(gfp_mask); if (!page) return NULL; oti->oti_dio_pages[cur] = page; } page = oti->oti_dio_pages[cur]; LASSERT(!test_bit(PG_private_2, &page->flags)); set_bit(PG_private_2, &page->flags); oti->oti_dio_pages_used++; LASSERT(!PageLocked(page)); lock_page(page); LASSERT(!page->mapping); LASSERT(!PageWriteback(page)); ClearPageUptodate(page); page->index = offset >> PAGE_SHIFT; } return page; } /* * there are following "locks": * journal_start * i_mutex * page lock * * osd write path: * - lock page(s) * - journal_start * - truncate_sem * * ext4 vmtruncate: * - lock pages, unlock * - journal_start * - lock partial page * - i_data_sem * */ /** * Unlock and release pages loaded by osd_bufs_get() * * Unlock \a npages pages from \a lnb and drop the refcount on them. * * \param env thread execution environment * \param dt dt object undergoing IO (OSD object + methods) * \param lnb array of pages undergoing IO * \param npages number of pages in \a lnb * * \retval 0 always */ static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt, struct niobuf_local *lnb, int npages) { struct osd_thread_info *oti = osd_oti_get(env); struct pagevec pvec; int i; ll_pagevec_init(&pvec, 0); for (i = 0; i < npages; i++) { struct page *page = lnb[i].lnb_page; if (page == NULL) continue; LASSERT(PageLocked(page)); /* if the page isn't cached, then reset uptodate * to prevent reuse */ if (test_bit(PG_private_2, &page->flags)) { clear_bit(PG_private_2, &page->flags); ClearPageUptodate(page); unlock_page(page); oti->oti_dio_pages_used--; } else { unlock_page(page); if (pagevec_add(&pvec, page) == 0) pagevec_release(&pvec); } dt_object_put(env, dt); lnb[i].lnb_page = NULL; } LASSERTF(oti->oti_dio_pages_used == 0, "%d\n", oti->oti_dio_pages_used); /* Release any partial pagevec */ pagevec_release(&pvec); RETURN(0); } /** * Load and lock pages undergoing IO * * Pages as described in the \a lnb array are fetched (from disk or cache) * and locked for IO by the caller. * * DLM locking protects us from write and truncate competing for same region, * but partial-page truncate can leave dirty pages in the cache for ldiskfs. * It's possible the writeout on a such a page is in progress when we access * it. It's also possible that during this writeout we put new (partial) data * into the page, but won't be able to proceed in filter_commitrw_write(). * Therefore, just wait for writeout completion as it should be rare enough. * * \param env thread execution environment * \param dt dt object undergoing IO (OSD object + methods) * \param pos byte offset of IO start * \param len number of bytes of IO * \param lnb array of extents undergoing IO * \param rw read or write operation, and other flags * \param capa capabilities * * \retval pages (zero or more) loaded successfully * \retval -ENOMEM on memory/page allocation error */ static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt, loff_t pos, ssize_t len, struct niobuf_local *lnb, enum dt_bufs_type rw) { struct osd_thread_info *oti = osd_oti_get(env); struct osd_object *obj = osd_dt_obj(dt); int npages, i, rc = 0; gfp_t gfp_mask; LASSERT(obj->oo_inode); if (!osd_use_page_cache(osd_obj2dev(obj))) { if (unlikely(!oti->oti_dio_pages)) { OBD_ALLOC(oti->oti_dio_pages, sizeof(struct page *) * PTLRPC_MAX_BRW_PAGES); if (!oti->oti_dio_pages) return -ENOMEM; } } osd_map_remote_to_local(pos, len, &npages, lnb); /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */ gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) : GFP_HIGHUSER; for (i = 0; i < npages; i++, lnb++) { lnb->lnb_page = osd_get_page(env, dt, lnb->lnb_file_offset, gfp_mask); if (lnb->lnb_page == NULL) GOTO(cleanup, rc = -ENOMEM); wait_on_page_writeback(lnb->lnb_page); BUG_ON(PageWriteback(lnb->lnb_page)); lu_object_get(&dt->do_lu); } RETURN(i); cleanup: if (i > 0) osd_bufs_put(env, dt, lnb - i, i); return rc; } #ifndef HAVE_LDISKFS_MAP_BLOCKS #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */ #define ldiskfs_ext_pblock(ex) ext_pblock((ex)) #endif struct bpointers { sector_t *blocks; unsigned long start; int num; int init_num; int create; }; static long ldiskfs_ext_find_goal(struct inode *inode, struct ldiskfs_ext_path *path, unsigned long block, int *aflags) { struct ldiskfs_inode_info *ei = LDISKFS_I(inode); unsigned long bg_start; unsigned long colour; int depth; if (path) { struct ldiskfs_extent *ex; depth = path->p_depth; /* try to predict block placement */ if ((ex = path[depth].p_ext)) return ldiskfs_ext_pblock(ex) + (block - le32_to_cpu(ex->ee_block)); /* it looks index is empty * try to find starting from index itself */ if (path[depth].p_bh) return path[depth].p_bh->b_blocknr; } /* OK. use inode's group */ bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) + le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block); colour = (current->pid % 16) * (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16); return bg_start + colour + block; } static unsigned long new_blocks(handle_t *handle, struct inode *inode, struct ldiskfs_ext_path *path, unsigned long block, unsigned long *count, int *err) { struct ldiskfs_allocation_request ar; unsigned long pblock; int aflags; /* find neighbour allocated blocks */ ar.lleft = block; *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft); if (*err) return 0; ar.lright = block; *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright); if (*err) return 0; /* allocate new block */ ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags); ar.inode = inode; ar.logical = block; ar.len = *count; ar.flags = LDISKFS_MB_HINT_DATA; pblock = ldiskfs_mb_new_blocks(handle, &ar, err); *count = ar.len; return pblock; } static int ldiskfs_ext_new_extent_cb(struct inode *inode, struct ldiskfs_ext_path *path, struct ldiskfs_ext_cache *cex, #ifdef HAVE_EXT_PREPARE_CB_EXTENT struct ldiskfs_extent *ex, #endif void *cbdata) { struct bpointers *bp = cbdata; struct ldiskfs_extent nex; unsigned long pblock = 0; unsigned long tgen; int err, i; unsigned long count; handle_t *handle; #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */ if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) { #else if ((cex->ec_len != 0) && (cex->ec_start != 0)) { #endif err = EXT_CONTINUE; goto map; } if (bp->create == 0) { i = 0; if (cex->ec_block < bp->start) i = bp->start - cex->ec_block; if (i >= cex->ec_len) CERROR("nothing to do?! i = %d, e_num = %u\n", i, cex->ec_len); for (; i < cex->ec_len && bp->num; i++) { *(bp->blocks) = 0; bp->blocks++; bp->num--; bp->start++; } return EXT_CONTINUE; } tgen = LDISKFS_I(inode)->i_ext_generation; count = ldiskfs_ext_calc_credits_for_insert(inode, path); handle = osd_journal_start(inode, LDISKFS_HT_MISC, count + LDISKFS_ALLOC_NEEDED + 1); if (IS_ERR(handle)) { return PTR_ERR(handle); } if (tgen != LDISKFS_I(inode)->i_ext_generation) { /* the tree has changed. so path can be invalid at moment */ ldiskfs_journal_stop(handle); return EXT_REPEAT; } /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not * protected by i_data_sem as whole. so we patch it to store * generation to path and now verify the tree hasn't changed */ down_write((&LDISKFS_I(inode)->i_data_sem)); /* validate extent, make sure the extent tree does not changed */ if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) { /* cex is invalid, try again */ up_write(&LDISKFS_I(inode)->i_data_sem); ldiskfs_journal_stop(handle); return EXT_REPEAT; } count = cex->ec_len; pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err); if (!pblock) goto out; BUG_ON(count > cex->ec_len); /* insert new extent */ nex.ee_block = cpu_to_le32(cex->ec_block); ldiskfs_ext_store_pblock(&nex, pblock); nex.ee_len = cpu_to_le16(count); err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0); if (err) { /* free data blocks we just allocated */ /* not a good idea to call discard here directly, * but otherwise we'd need to call it every free() */ ldiskfs_discard_preallocations(inode); #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */ ldiskfs_free_blocks(handle, inode, NULL, ldiskfs_ext_pblock(&nex), le16_to_cpu(nex.ee_len), 0); #else ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex), le16_to_cpu(nex.ee_len), 0); #endif goto out; } /* * Putting len of the actual extent we just inserted, * we are asking ldiskfs_ext_walk_space() to continue * scaning after that block */ cex->ec_len = le16_to_cpu(nex.ee_len); cex->ec_start = ldiskfs_ext_pblock(&nex); BUG_ON(le16_to_cpu(nex.ee_len) == 0); BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block); out: up_write((&LDISKFS_I(inode)->i_data_sem)); ldiskfs_journal_stop(handle); map: if (err >= 0) { /* map blocks */ if (bp->num == 0) { CERROR("hmm. why do we find this extent?\n"); CERROR("initial space: %lu:%u\n", bp->start, bp->init_num); #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */ CERROR("current extent: %u/%u/%llu %d\n", cex->ec_block, cex->ec_len, (unsigned long long)cex->ec_start, cex->ec_type); #else CERROR("current extent: %u/%u/%llu\n", cex->ec_block, cex->ec_len, (unsigned long long)cex->ec_start); #endif } i = 0; if (cex->ec_block < bp->start) i = bp->start - cex->ec_block; if (i >= cex->ec_len) CERROR("nothing to do?! i = %d, e_num = %u\n", i, cex->ec_len); for (; i < cex->ec_len && bp->num; i++) { *(bp->blocks) = cex->ec_start + i; /* unmap any underlying metadata from * the block device mapping. b=6998. */ if (pblock != 0) clean_bdev_aliases(inode->i_sb->s_bdev, *(bp->blocks), 1); bp->blocks++; bp->num--; bp->start++; } } return err; } static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index, int clen, sector_t *blocks, int create) { int blocks_per_page = PAGE_SIZE >> inode->i_blkbits; struct bpointers bp; int err; if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT) return -EFBIG; bp.blocks = blocks; bp.start = index * blocks_per_page; bp.init_num = bp.num = clen * blocks_per_page; bp.create = create; CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n", bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino); err = ldiskfs_ext_walk_space(inode, bp.start, bp.num, ldiskfs_ext_new_extent_cb, &bp); ldiskfs_ext_invalidate_cache(inode); return err; } static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode, struct page **page, int pages, sector_t *blocks, int create) { int blocks_per_page = PAGE_SIZE >> inode->i_blkbits; pgoff_t bitmap_max_page_index; sector_t *b; int rc = 0, i; bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >> PAGE_SHIFT; for (i = 0, b = blocks; i < pages; i++, page++) { if ((*page)->index + 1 >= bitmap_max_page_index) { rc = -EFBIG; break; } rc = ldiskfs_map_inode_page(inode, *page, b, create); if (rc) { CERROR("ino %lu, blk %llu create %d: rc %d\n", inode->i_ino, (unsigned long long)*b, create, rc); break; } b += blocks_per_page; } return rc; } static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode, struct page **page, int pages, sector_t *blocks, int create) { int rc = 0, i = 0, clen = 0; struct page *fp = NULL; CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n", inode->i_ino, pages, (*page)->index); /* pages are sorted already. so, we just have to find * contig. space and process them properly */ while (i < pages) { if (fp == NULL) { /* start new extent */ fp = *page++; clen = 1; i++; continue; } else if (fp->index + clen == (*page)->index) { /* continue the extent */ page++; clen++; i++; continue; } /* process found extent */ rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen, blocks, create); if (rc) GOTO(cleanup, rc); /* look for next extent */ fp = NULL; blocks += clen * (PAGE_SIZE >> inode->i_blkbits); } if (fp) rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen, blocks, create); cleanup: return rc; } static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page, int pages, sector_t *blocks, int create) { int rc; if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) { rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages, blocks, create); return rc; } rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create); return rc; } #else static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page, int pages, sector_t *blocks, int create) { int blocks_per_page = PAGE_SIZE >> inode->i_blkbits; int rc = 0, i = 0; struct page *fp = NULL; int clen = 0; pgoff_t max_page_index; handle_t *handle = NULL; max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT; CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n", inode->i_ino, pages, (*page)->index); if (create) { create = LDISKFS_GET_BLOCKS_CREATE; handle = ldiskfs_journal_current_handle(); LASSERT(handle != NULL); rc = osd_attach_jinode(inode); if (rc) return rc; } /* pages are sorted already. so, we just have to find * contig. space and process them properly */ while (i < pages) { long blen, total = 0; struct ldiskfs_map_blocks map = { 0 }; if (fp == NULL) { /* start new extent */ fp = *page++; clen = 1; if (++i != pages) continue; } else if (fp->index + clen == (*page)->index) { /* continue the extent */ page++; clen++; if (++i != pages) continue; } if (fp->index + clen >= max_page_index) GOTO(cleanup, rc = -EFBIG); /* process found extent */ map.m_lblk = fp->index * blocks_per_page; map.m_len = blen = clen * blocks_per_page; cont_map: rc = ldiskfs_map_blocks(handle, inode, &map, create); if (rc >= 0) { int c = 0; for (; total < blen && c < map.m_len; c++, total++) { if (rc == 0) { *(blocks + total) = 0; total++; break; } else { *(blocks + total) = map.m_pblk + c; /* unmap any possible underlying * metadata from the block device * mapping. bug 6998. */ if ((map.m_flags & LDISKFS_MAP_NEW) && create) clean_bdev_aliases( inode->i_sb->s_bdev, map.m_pblk + c, 1); } } rc = 0; } if (rc == 0 && total < blen) { map.m_lblk = fp->index * blocks_per_page + total; map.m_len = blen - total; goto cont_map; } if (rc != 0) GOTO(cleanup, rc); /* look for next extent */ fp = NULL; blocks += blocks_per_page * clen; } cleanup: return rc; } #endif /* HAVE_LDISKFS_MAP_BLOCKS */ static int osd_write_prep(const struct lu_env *env, struct dt_object *dt, struct niobuf_local *lnb, int npages) { struct osd_thread_info *oti = osd_oti_get(env); struct osd_iobuf *iobuf = &oti->oti_iobuf; struct inode *inode = osd_dt_obj(dt)->oo_inode; struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt)); ktime_t start; ktime_t end; s64 timediff; ssize_t isize; __s64 maxidx; int rc = 0; int i; int cache = 0; LASSERT(inode); rc = osd_init_iobuf(osd, iobuf, 0, npages); if (unlikely(rc != 0)) RETURN(rc); isize = i_size_read(inode); maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1; if (osd->od_writethrough_cache) cache = 1; if (isize > osd->od_readcache_max_filesize) cache = 0; start = ktime_get(); for (i = 0; i < npages; i++) { if (cache == 0) generic_error_remove_page(inode->i_mapping, lnb[i].lnb_page); /* * till commit the content of the page is undefined * we'll set it uptodate once bulk is done. otherwise * subsequent reads can access non-stable data */ ClearPageUptodate(lnb[i].lnb_page); if (lnb[i].lnb_len == PAGE_SIZE) continue; if (maxidx >= lnb[i].lnb_page->index) { osd_iobuf_add_page(iobuf, &lnb[i]); } else { long off; char *p = kmap(lnb[i].lnb_page); off = lnb[i].lnb_page_offset; if (off) memset(p, 0, off); off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) & ~PAGE_MASK; if (off) memset(p + off, 0, PAGE_SIZE - off); kunmap(lnb[i].lnb_page); } } end = ktime_get(); timediff = ktime_us_delta(end, start); lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff); if (iobuf->dr_npages) { rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages, iobuf->dr_npages, iobuf->dr_blocks, 0); if (likely(rc == 0)) { rc = osd_do_bio(osd, inode, iobuf); /* do IO stats for preparation reads */ osd_fini_iobuf(osd, iobuf); } } RETURN(rc); } struct osd_fextent { sector_t start; sector_t end; unsigned int mapped:1; }; static int osd_is_mapped(struct dt_object *dt, __u64 offset, struct osd_fextent *cached_extent) { struct inode *inode = osd_dt_obj(dt)->oo_inode; sector_t block = offset >> inode->i_blkbits; sector_t start; struct fiemap_extent_info fei = { 0 }; struct fiemap_extent fe = { 0 }; mm_segment_t saved_fs; int rc; if (block >= cached_extent->start && block < cached_extent->end) return cached_extent->mapped; if (i_size_read(inode) == 0) return 0; /* Beyond EOF, must not be mapped */ if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block) return 0; fei.fi_extents_max = 1; fei.fi_extents_start = &fe; saved_fs = get_fs(); set_fs(get_ds()); rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset); set_fs(saved_fs); if (rc != 0) return 0; start = fe.fe_logical >> inode->i_blkbits; if (start > block) { cached_extent->start = block; cached_extent->end = start; cached_extent->mapped = 0; } else { cached_extent->start = start; cached_extent->end = (fe.fe_logical + fe.fe_length) >> inode->i_blkbits; cached_extent->mapped = 1; } return cached_extent->mapped; } static int osd_declare_write_commit(const struct lu_env *env, struct dt_object *dt, struct niobuf_local *lnb, int npages, struct thandle *handle) { const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt)); struct inode *inode = osd_dt_obj(dt)->oo_inode; struct osd_thandle *oh; int extents = 1; int depth; int i; int newblocks; int rc = 0; int flags = 0; int credits = 0; long long quota_space = 0; struct osd_fextent extent = { 0 }; enum osd_qid_declare_flags declare_flags = OSD_QID_BLK; ENTRY; LASSERT(handle != NULL); oh = container_of0(handle, struct osd_thandle, ot_super); LASSERT(oh->ot_handle == NULL); newblocks = npages; /* calculate number of extents (probably better to pass nb) */ for (i = 0; i < npages; i++) { if (i && lnb[i].lnb_file_offset != lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len) extents++; if (osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent)) lnb[i].lnb_flags |= OBD_BRW_MAPPED; else quota_space += PAGE_SIZE; /* ignore quota for the whole request if any page is from * client cache or written by root. * * XXX once we drop the 1.8 client support, the checking * for whether page is from cache can be simplified as: * !(lnb[i].flags & OBD_BRW_SYNC) * * XXX we could handle this on per-lnb basis as done by * grant. */ if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) || (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) == OBD_BRW_FROM_GRANT) declare_flags |= OSD_QID_FORCE; } /* * each extent can go into new leaf causing a split * 5 is max tree depth: inode + 4 index blocks * with blockmaps, depth is 3 at most */ if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) { /* * many concurrent threads may grow tree by the time * our transaction starts. so, consider 2 is a min depth */ depth = ext_depth(inode); depth = max(depth, 1) + 1; newblocks += depth; credits++; /* inode */ credits += depth * 2 * extents; } else { depth = 3; newblocks += depth; credits++; /* inode */ credits += depth * extents; } /* quota space for metadata blocks */ quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd)); /* quota space should be reported in 1K blocks */ quota_space = toqb(quota_space); /* each new block can go in different group (bitmap + gd) */ /* we can't dirty more bitmap blocks than exist */ if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count) credits += LDISKFS_SB(osd_sb(osd))->s_groups_count; else credits += newblocks; /* we can't dirty more gd blocks than exist */ if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count) credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count; else credits += newblocks; osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits); /* make sure the over quota flags were not set */ lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA; rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode), i_projid_read(inode), quota_space, oh, osd_dt_obj(dt), &flags, declare_flags); /* we need only to store the overquota flags in the first lnb for * now, once we support multiple objects BRW, this code needs be * revised. */ if (flags & QUOTA_FL_OVER_USRQUOTA) lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA; if (flags & QUOTA_FL_OVER_GRPQUOTA) lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA; if (flags & QUOTA_FL_OVER_PRJQUOTA) lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA; if (rc == 0) rc = osd_trunc_lock(osd_dt_obj(dt), oh, true); RETURN(rc); } /* Check if a block is allocated or not */ static int osd_write_commit(const struct lu_env *env, struct dt_object *dt, struct niobuf_local *lnb, int npages, struct thandle *thandle) { struct osd_thread_info *oti = osd_oti_get(env); struct osd_iobuf *iobuf = &oti->oti_iobuf; struct inode *inode = osd_dt_obj(dt)->oo_inode; struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt)); loff_t isize; int rc = 0, i; LASSERT(inode); rc = osd_init_iobuf(osd, iobuf, 1, npages); if (unlikely(rc != 0)) RETURN(rc); isize = i_size_read(inode); ll_vfs_dq_init(inode); for (i = 0; i < npages; i++) { if (lnb[i].lnb_rc == -ENOSPC && (lnb[i].lnb_flags & OBD_BRW_MAPPED)) { /* Allow the write to proceed if overwriting an * existing block */ lnb[i].lnb_rc = 0; } if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */ CDEBUG(D_INODE, "Skipping [%d] == %d\n", i, lnb[i].lnb_rc); LASSERT(lnb[i].lnb_page); generic_error_remove_page(inode->i_mapping, lnb[i].lnb_page); continue; } LASSERT(PageLocked(lnb[i].lnb_page)); LASSERT(!PageWriteback(lnb[i].lnb_page)); if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize) isize = lnb[i].lnb_file_offset + lnb[i].lnb_len; /* * Since write and truncate are serialized by oo_sem, even * partial-page truncate should not leave dirty pages in the * page cache. */ LASSERT(!PageDirty(lnb[i].lnb_page)); SetPageUptodate(lnb[i].lnb_page); osd_iobuf_add_page(iobuf, &lnb[i]); } osd_trans_exec_op(env, thandle, OSD_OT_WRITE); if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) { rc = -ENOSPC; } else if (iobuf->dr_npages > 0) { rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages, iobuf->dr_npages, iobuf->dr_blocks, 1); } else { /* no pages to write, no transno is needed */ thandle->th_local = 1; } if (likely(rc == 0)) { spin_lock(&inode->i_lock); if (isize > i_size_read(inode)) { i_size_write(inode, isize); LDISKFS_I(inode)->i_disksize = isize; spin_unlock(&inode->i_lock); ll_dirty_inode(inode, I_DIRTY_DATASYNC); } else { spin_unlock(&inode->i_lock); } rc = osd_do_bio(osd, inode, iobuf); /* we don't do stats here as in read path because * write is async: we'll do this in osd_put_bufs() */ } else { osd_fini_iobuf(osd, iobuf); } osd_trans_exec_check(env, thandle, OSD_OT_WRITE); if (unlikely(rc != 0)) { /* if write fails, we should drop pages from the cache */ for (i = 0; i < npages; i++) { if (lnb[i].lnb_page == NULL) continue; LASSERT(PageLocked(lnb[i].lnb_page)); generic_error_remove_page(inode->i_mapping, lnb[i].lnb_page); } } RETURN(rc); } static int osd_read_prep(const struct lu_env *env, struct dt_object *dt, struct niobuf_local *lnb, int npages) { struct osd_thread_info *oti = osd_oti_get(env); struct osd_iobuf *iobuf = &oti->oti_iobuf; struct inode *inode = osd_dt_obj(dt)->oo_inode; struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt)); int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0; ktime_t start, end; s64 timediff; loff_t isize; LASSERT(inode); rc = osd_init_iobuf(osd, iobuf, 0, npages); if (unlikely(rc != 0)) RETURN(rc); isize = i_size_read(inode); if (osd->od_read_cache) cache = 1; if (isize > osd->od_readcache_max_filesize) cache = 0; start = ktime_get(); for (i = 0; i < npages; i++) { if (isize <= lnb[i].lnb_file_offset) /* If there's no more data, abort early. * lnb->lnb_rc == 0, so it's easy to detect later. */ break; if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len) lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset; else lnb[i].lnb_rc = lnb[i].lnb_len; /* Bypass disk read if fail_loc is set properly */ if (OBD_FAIL_CHECK(OBD_FAIL_OST_FAKE_RW)) SetPageUptodate(lnb[i].lnb_page); if (PageUptodate(lnb[i].lnb_page)) { cache_hits++; } else { cache_misses++; osd_iobuf_add_page(iobuf, &lnb[i]); } if (cache == 0) generic_error_remove_page(inode->i_mapping, lnb[i].lnb_page); } end = ktime_get(); timediff = ktime_us_delta(end, start); lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff); if (cache_hits != 0) lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT, cache_hits); if (cache_misses != 0) lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS, cache_misses); if (cache_hits + cache_misses != 0) lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS, cache_hits + cache_misses); if (iobuf->dr_npages) { rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages, iobuf->dr_npages, iobuf->dr_blocks, 0); rc = osd_do_bio(osd, inode, iobuf); /* IO stats will be done in osd_bufs_put() */ } RETURN(rc); } /* * XXX: Another layering violation for now. * * We don't want to use ->f_op->read methods, because generic file write * * - serializes on ->i_sem, and * * - does a lot of extra work like balance_dirty_pages(), * * which doesn't work for globally shared files like /last_rcvd. */ static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen) { struct ldiskfs_inode_info *ei = LDISKFS_I(inode); memcpy(buffer, (char *)ei->i_data, buflen); return buflen; } int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs) { struct buffer_head *bh; unsigned long block; int osize; int blocksize; int csize; int boffs; /* prevent reading after eof */ spin_lock(&inode->i_lock); if (i_size_read(inode) < *offs + size) { loff_t diff = i_size_read(inode) - *offs; spin_unlock(&inode->i_lock); if (diff < 0) { CDEBUG(D_OTHER, "size %llu is too short to read @%llu\n", i_size_read(inode), *offs); return -EBADR; } else if (diff == 0) { return 0; } else { size = diff; } } else { spin_unlock(&inode->i_lock); } blocksize = 1 << inode->i_blkbits; osize = size; while (size > 0) { block = *offs >> inode->i_blkbits; boffs = *offs & (blocksize - 1); csize = min(blocksize - boffs, size); bh = __ldiskfs_bread(NULL, inode, block, 0); if (IS_ERR(bh)) { CERROR("%s: can't read %u@%llu on ino %lu: " "rc = %ld\n", osd_ino2name(inode), csize, *offs, inode->i_ino, PTR_ERR(bh)); return PTR_ERR(bh); } if (bh != NULL) { memcpy(buf, bh->b_data + boffs, csize); brelse(bh); } else { memset(buf, 0, csize); } *offs += csize; buf += csize; size -= csize; } return osize; } static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt, struct lu_buf *buf, loff_t *pos) { struct inode *inode = osd_dt_obj(dt)->oo_inode; int rc; /* Read small symlink from inode body as we need to maintain correct * on-disk symlinks for ldiskfs. */ if (S_ISLNK(dt->do_lu.lo_header->loh_attr) && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data))) rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len); else rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos); return rc; } static inline int osd_extents_enabled(struct super_block *sb, struct inode *inode) { if (inode != NULL) { if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) return 1; } else if (ldiskfs_has_feature_extents(sb)) { return 1; } return 0; } int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode, const loff_t size, const loff_t pos, const int blocks) { int credits, bits, bs, i; bits = sb->s_blocksize_bits; bs = 1 << bits; /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself) * we do not expect blockmaps on the large files, * so let's shrink it to 2 levels (4GB files) */ /* this is default reservation: 2 levels */ credits = (blocks + 2) * 3; /* actual offset is unknown, hard to optimize */ if (pos == -1) return credits; /* now check for few specific cases to optimize */ if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) { /* no indirects */ credits = blocks; /* allocate if not allocated */ if (inode == NULL) { credits += blocks * 2; return credits; } for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) { LASSERT(i < LDISKFS_NDIR_BLOCKS); if (LDISKFS_I(inode)->i_data[i] == 0) credits += 2; } } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) { /* single indirect */ credits = blocks * 3; if (inode == NULL || LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0) credits += 3; else /* The indirect block may be modified. */ credits += 1; } return credits; } static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt, const struct lu_buf *buf, loff_t _pos, struct thandle *handle) { struct osd_object *obj = osd_dt_obj(dt); struct inode *inode = obj->oo_inode; struct super_block *sb = osd_sb(osd_obj2dev(obj)); struct osd_thandle *oh; int rc = 0, est = 0, credits, blocks, allocated = 0; int bits, bs; int depth, size; loff_t pos; ENTRY; LASSERT(buf != NULL); LASSERT(handle != NULL); oh = container_of0(handle, struct osd_thandle, ot_super); LASSERT(oh->ot_handle == NULL); size = buf->lb_len; bits = sb->s_blocksize_bits; bs = 1 << bits; if (_pos == -1) { /* if this is an append, then we * should expect cross-block record */ pos = 0; } else { pos = _pos; } /* blocks to modify */ blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits); LASSERT(blocks > 0); if (inode != NULL && _pos != -1) { /* object size in blocks */ est = (i_size_read(inode) + bs - 1) >> bits; allocated = inode->i_blocks >> (bits - 9); if (pos + size <= i_size_read(inode) && est <= allocated) { /* looks like an overwrite, no need to modify tree */ credits = blocks; /* no need to modify i_size */ goto out; } } if (osd_extents_enabled(sb, inode)) { /* * many concurrent threads may grow tree by the time * our transaction starts. so, consider 2 is a min depth * for every level we may need to allocate a new block * and take some entries from the old one. so, 3 blocks * to allocate (bitmap, gd, itself) + old block - 4 per * level. */ depth = inode != NULL ? ext_depth(inode) : 0; depth = max(depth, 1) + 1; credits = depth; /* if not append, then split may need to modify * existing blocks moving entries into the new ones */ if (_pos != -1) credits += depth; /* blocks to store data: bitmap,gd,itself */ credits += blocks * 3; } else { credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks); } /* if inode is created as part of the transaction, * then it's counted already by the creation method */ if (inode != NULL) credits++; out: osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits); /* dt_declare_write() is usually called for system objects, such * as llog or last_rcvd files. We needn't enforce quota on those * objects, so always set the lqi_space as 0. */ if (inode != NULL) rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode), i_projid_read(inode), 0, oh, obj, NULL, OSD_QID_BLK); if (rc == 0) rc = osd_trunc_lock(obj, oh, true); RETURN(rc); } static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen) { /* LU-2634: clear the extent format for fast symlink */ ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS); memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen); spin_lock(&inode->i_lock); LDISKFS_I(inode)->i_disksize = buflen; i_size_write(inode, buflen); spin_unlock(&inode->i_lock); ll_dirty_inode(inode, I_DIRTY_DATASYNC); return 0; } int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize, int write_NUL, loff_t *offs, handle_t *handle) { struct buffer_head *bh = NULL; loff_t offset = *offs; loff_t new_size = i_size_read(inode); unsigned long block; int blocksize = 1 << inode->i_blkbits; int err = 0; int size; int boffs; int dirty_inode = 0; if (write_NUL) { /* * long symlink write does not count the NUL terminator in * bufsize, we write it, and the inode's file size does not * count the NUL terminator as well. */ ((char *)buf)[bufsize] = '\0'; ++bufsize; } while (bufsize > 0) { int credits = handle->h_buffer_credits; if (bh) brelse(bh); block = offset >> inode->i_blkbits; boffs = offset & (blocksize - 1); size = min(blocksize - boffs, bufsize); bh = __ldiskfs_bread(handle, inode, block, 1); if (IS_ERR_OR_NULL(bh)) { if (bh == NULL) { err = -EIO; } else { err = PTR_ERR(bh); bh = NULL; } CERROR("%s: error reading offset %llu (block %lu, " "size %d, offs %llu), credits %d/%d: rc = %d\n", inode->i_sb->s_id, offset, block, bufsize, *offs, credits, handle->h_buffer_credits, err); break; } err = ldiskfs_journal_get_write_access(handle, bh); if (err) { CERROR("journal_get_write_access() returned error %d\n", err); break; } LASSERTF(boffs + size <= bh->b_size, "boffs %d size %d bh->b_size %lu\n", boffs, size, (unsigned long)bh->b_size); memcpy(bh->b_data + boffs, buf, size); err = ldiskfs_handle_dirty_metadata(handle, NULL, bh); if (err) break; if (offset + size > new_size) new_size = offset + size; offset += size; bufsize -= size; buf += size; } if (bh) brelse(bh); if (write_NUL) --new_size; /* correct in-core and on-disk sizes */ if (new_size > i_size_read(inode)) { spin_lock(&inode->i_lock); if (new_size > i_size_read(inode)) i_size_write(inode, new_size); if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) { LDISKFS_I(inode)->i_disksize = i_size_read(inode); dirty_inode = 1; } spin_unlock(&inode->i_lock); if (dirty_inode) ll_dirty_inode(inode, I_DIRTY_DATASYNC); } if (err == 0) *offs = offset; return err; } static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt, const struct lu_buf *buf, loff_t *pos, struct thandle *handle) { struct inode *inode = osd_dt_obj(dt)->oo_inode; struct osd_thandle *oh; ssize_t result; int is_link; LASSERT(dt_object_exists(dt)); LASSERT(handle != NULL); LASSERT(inode != NULL); ll_vfs_dq_init(inode); /* XXX: don't check: one declared chunk can be used many times */ /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */ oh = container_of(handle, struct osd_thandle, ot_super); LASSERT(oh->ot_handle->h_transaction != NULL); osd_trans_exec_op(env, handle, OSD_OT_WRITE); /* Write small symlink to inode body as we need to maintain correct * on-disk symlinks for ldiskfs. * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len * does not count it in. */ is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr); if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data))) result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len); else result = osd_ldiskfs_write_record(inode, buf->lb_buf, buf->lb_len, is_link, pos, oh->ot_handle); if (result == 0) result = buf->lb_len; osd_trans_exec_check(env, handle, OSD_OT_WRITE); return result; } static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt, __u64 start, __u64 end, struct thandle *th) { struct osd_thandle *oh; struct inode *inode; int rc; ENTRY; LASSERT(th); oh = container_of(th, struct osd_thandle, ot_super); /* * we don't need to reserve credits for whole truncate * it's not possible as truncate may need to free too many * blocks and that won't fit a single transaction. instead * we reserve credits to change i_size and put inode onto * orphan list. if needed truncate will extend or restart * transaction */ osd_trans_declare_op(env, oh, OSD_OT_PUNCH, osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3); inode = osd_dt_obj(dt)->oo_inode; LASSERT(inode); rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode), i_projid_read(inode), 0, oh, osd_dt_obj(dt), NULL, OSD_QID_BLK); if (rc == 0) rc = osd_trunc_lock(osd_dt_obj(dt), oh, false); RETURN(rc); } static int osd_punch(const struct lu_env *env, struct dt_object *dt, __u64 start, __u64 end, struct thandle *th) { struct osd_object *obj = osd_dt_obj(dt); struct osd_device *osd = osd_obj2dev(obj); struct inode *inode = obj->oo_inode; struct osd_access_lock *al; struct osd_thandle *oh; int rc = 0, found = 0; bool grow = false; ENTRY; LASSERT(end == OBD_OBJECT_EOF); LASSERT(dt_object_exists(dt)); LASSERT(osd_invariant(obj)); LASSERT(inode != NULL); ll_vfs_dq_init(inode); LASSERT(th); oh = container_of(th, struct osd_thandle, ot_super); LASSERT(oh->ot_handle->h_transaction != NULL); /* we used to skip truncate to current size to * optimize truncates on OST. with DoM we can * get attr_set to set specific size (MDS_REINT) * and then get truncate RPC which essentially * would be skipped. this is bad.. so, disable * this optimization on MDS till the client stop * to sent MDS_REINT (LU-11033) -bzzz */ if (osd->od_is_ost && i_size_read(inode) == start) RETURN(0); osd_trans_exec_op(env, th, OSD_OT_PUNCH); spin_lock(&inode->i_lock); if (i_size_read(inode) < start) grow = true; i_size_write(inode, start); spin_unlock(&inode->i_lock); ll_truncate_pagecache(inode, start); /* optimize grow case */ if (grow) { osd_execute_truncate(obj); GOTO(out, rc); } /* add to orphan list to ensure truncate completion * if this transaction succeed. ldiskfs_truncate() * will take the inode out of the list */ rc = ldiskfs_orphan_add(oh->ot_handle, inode); if (rc != 0) GOTO(out, rc); list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) { if (obj != al->tl_obj) continue; LASSERT(al->tl_shared == 0); found = 1; /* do actual truncate in osd_trans_stop() */ al->tl_truncate = 1; break; } LASSERT(found); out: RETURN(rc); } static int fiemap_check_ranges(struct inode *inode, u64 start, u64 len, u64 *new_len) { loff_t maxbytes; *new_len = len; if (len == 0) return -EINVAL; if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS)) maxbytes = inode->i_sb->s_maxbytes; else maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes; if (start > maxbytes) return -EFBIG; /* * Shrink request scope to what the fs can actually handle. */ if (len > maxbytes || (maxbytes - len) < start) *new_len = maxbytes - start; return 0; } /* So that the fiemap access checks can't overflow on 32 bit machines. */ #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt, struct fiemap *fm) { struct fiemap_extent_info fieinfo = {0, }; struct inode *inode = osd_dt_obj(dt)->oo_inode; u64 len; int rc; mm_segment_t cur_fs; LASSERT(inode); if (inode->i_op->fiemap == NULL) return -EOPNOTSUPP; if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS) return -EINVAL; rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len); if (rc) return rc; fieinfo.fi_flags = fm->fm_flags; fieinfo.fi_extents_max = fm->fm_extent_count; fieinfo.fi_extents_start = fm->fm_extents; if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC) filemap_write_and_wait(inode->i_mapping); /* Save previous value address limit */ cur_fs = get_fs(); /* Set the address limit of the kernel */ set_fs(get_ds()); rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len); fm->fm_flags = fieinfo.fi_flags; fm->fm_mapped_extents = fieinfo.fi_extents_mapped; /* Restore the previous address limt */ set_fs(cur_fs); return rc; } static int osd_ladvise(const struct lu_env *env, struct dt_object *dt, __u64 start, __u64 end, enum lu_ladvise_type advice) { int rc = 0; struct inode *inode = osd_dt_obj(dt)->oo_inode; ENTRY; switch (advice) { case LU_LADVISE_DONTNEED: if (end == 0) break; invalidate_mapping_pages(inode->i_mapping, start >> PAGE_SHIFT, (end - 1) >> PAGE_SHIFT); break; default: rc = -ENOTSUPP; break; } RETURN(rc); } /* * in some cases we may need declare methods for objects being created * e.g., when we create symlink */ const struct dt_body_operations osd_body_ops_new = { .dbo_declare_write = osd_declare_write, }; const struct dt_body_operations osd_body_ops = { .dbo_read = osd_read, .dbo_declare_write = osd_declare_write, .dbo_write = osd_write, .dbo_bufs_get = osd_bufs_get, .dbo_bufs_put = osd_bufs_put, .dbo_write_prep = osd_write_prep, .dbo_declare_write_commit = osd_declare_write_commit, .dbo_write_commit = osd_write_commit, .dbo_read_prep = osd_read_prep, .dbo_declare_punch = osd_declare_punch, .dbo_punch = osd_punch, .dbo_fiemap_get = osd_fiemap_get, .dbo_ladvise = osd_ladvise, }; /** * Get a truncate lock * * In order to take multi-transaction truncate out of main transaction we let * the caller grab a lock on the object passed. the lock can be shared (for * writes) and exclusive (for truncate). It's not allowed to mix truncate * and write in the same transaction handle (do not confuse with big ldiskfs * transaction containing lots of handles). * The lock must be taken at declaration. * * \param obj object to lock * \oh transaction * \shared shared or exclusive * * \retval 0 lock is granted * \retval -NOMEM no memory to allocate lock */ int osd_trunc_lock(struct osd_object *obj, struct osd_thandle *oh, bool shared) { struct osd_access_lock *al, *tmp; LASSERT(obj); LASSERT(oh); list_for_each_entry(tmp, &oh->ot_trunc_locks, tl_list) { if (tmp->tl_obj != obj) continue; LASSERT(tmp->tl_shared == shared); /* found same lock */ return 0; } OBD_ALLOC_PTR(al); if (unlikely(al == NULL)) return -ENOMEM; al->tl_obj = obj; al->tl_truncate = false; if (shared) down_read(&obj->oo_ext_idx_sem); else down_write(&obj->oo_ext_idx_sem); al->tl_shared = shared; list_add(&al->tl_list, &oh->ot_trunc_locks); return 0; } void osd_trunc_unlock_all(struct list_head *list) { struct osd_access_lock *al, *tmp; list_for_each_entry_safe(al, tmp, list, tl_list) { if (al->tl_shared) up_read(&al->tl_obj->oo_ext_idx_sem); else up_write(&al->tl_obj->oo_ext_idx_sem); list_del(&al->tl_list); OBD_FREE_PTR(al); } } void osd_execute_truncate(struct osd_object *obj) { struct osd_device *d = osd_obj2dev(obj); struct inode *inode = obj->oo_inode; __u64 size; /* simulate crash before (in the middle) of delayed truncate */ if (OBD_FAIL_CHECK(OBD_FAIL_OSD_FAIL_AT_TRUNCATE)) { struct ldiskfs_inode_info *ei = LDISKFS_I(inode); struct ldiskfs_sb_info *sbi = LDISKFS_SB(inode->i_sb); mutex_lock(&sbi->s_orphan_lock); list_del_init(&ei->i_orphan); mutex_unlock(&sbi->s_orphan_lock); return; } ldiskfs_truncate(inode); /* * For a partial-page truncate, flush the page to disk immediately to * avoid data corruption during direct disk write. b=17397 */ size = i_size_read(inode); if ((size & ~PAGE_MASK) == 0) return; if (osd_use_page_cache(d)) { filemap_fdatawrite_range(inode->i_mapping, size, size + 1); } else { /* Notice we use "wait" version to ensure I/O is complete */ filemap_write_and_wait_range(inode->i_mapping, size, size + 1); invalidate_mapping_pages(inode->i_mapping, size >> PAGE_SHIFT, size >> PAGE_SHIFT); } } void osd_process_truncates(struct list_head *list) { struct osd_access_lock *al; LASSERT(journal_current_handle() == NULL); list_for_each_entry(al, list, tl_list) { if (al->tl_shared) continue; if (!al->tl_truncate) continue; osd_execute_truncate(al->tl_obj); } }