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fs/btrfs/compression.c
26.6 KB
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/* * Copyright (C) 2008 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 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 for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include <linux/kernel.h> #include <linux/bio.h> #include <linux/buffer_head.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/pagemap.h> #include <linux/highmem.h> #include <linux/time.h> #include <linux/init.h> #include <linux/string.h> |
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#include <linux/backing-dev.h> #include <linux/mpage.h> #include <linux/swap.h> #include <linux/writeback.h> #include <linux/bit_spinlock.h> |
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#include <linux/slab.h> |
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#include "compat.h" |
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#include "ctree.h" #include "disk-io.h" #include "transaction.h" #include "btrfs_inode.h" #include "volumes.h" #include "ordered-data.h" |
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#include "compression.h" #include "extent_io.h" #include "extent_map.h" struct compressed_bio { /* number of bios pending for this compressed extent */ atomic_t pending_bios; /* the pages with the compressed data on them */ struct page **compressed_pages; /* inode that owns this data */ struct inode *inode; /* starting offset in the inode for our pages */ u64 start; /* number of bytes in the inode we're working on */ unsigned long len; /* number of bytes on disk */ unsigned long compressed_len; |
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/* the compression algorithm for this bio */ int compress_type; |
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/* number of compressed pages in the array */ unsigned long nr_pages; /* IO errors */ int errors; |
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int mirror_num; |
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/* for reads, this is the bio we are copying the data into */ struct bio *orig_bio; |
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/* * the start of a variable length array of checksums only * used by reads */ u32 sums; |
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}; |
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static inline int compressed_bio_size(struct btrfs_root *root, unsigned long disk_size) { |
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u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
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return sizeof(struct compressed_bio) + ((disk_size + root->sectorsize - 1) / root->sectorsize) * csum_size; } |
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static struct bio *compressed_bio_alloc(struct block_device *bdev, u64 first_byte, gfp_t gfp_flags) { |
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int nr_vecs; nr_vecs = bio_get_nr_vecs(bdev); |
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return btrfs_bio_alloc(bdev, first_byte >> 9, nr_vecs, gfp_flags); |
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} |
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static int check_compressed_csum(struct inode *inode, struct compressed_bio *cb, u64 disk_start) { int ret; struct btrfs_root *root = BTRFS_I(inode)->root; struct page *page; unsigned long i; char *kaddr; u32 csum; u32 *cb_sum = &cb->sums; |
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if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) |
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return 0; for (i = 0; i < cb->nr_pages; i++) { page = cb->compressed_pages[i]; csum = ~(u32)0; kaddr = kmap_atomic(page, KM_USER0); csum = btrfs_csum_data(root, kaddr, csum, PAGE_CACHE_SIZE); btrfs_csum_final(csum, (char *)&csum); kunmap_atomic(kaddr, KM_USER0); if (csum != *cb_sum) { |
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printk(KERN_INFO "btrfs csum failed ino %llu " |
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"extent %llu csum %u " |
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"wanted %u mirror %d ", (unsigned long long)btrfs_ino(inode), |
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(unsigned long long)disk_start, csum, *cb_sum, cb->mirror_num); ret = -EIO; goto fail; } cb_sum++; } ret = 0; fail: return ret; } |
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/* when we finish reading compressed pages from the disk, we * decompress them and then run the bio end_io routines on the * decompressed pages (in the inode address space). * * This allows the checksumming and other IO error handling routines * to work normally * * The compressed pages are freed here, and it must be run * in process context */ static void end_compressed_bio_read(struct bio *bio, int err) { |
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struct compressed_bio *cb = bio->bi_private; struct inode *inode; struct page *page; unsigned long index; int ret; if (err) cb->errors = 1; /* if there are more bios still pending for this compressed * extent, just exit */ if (!atomic_dec_and_test(&cb->pending_bios)) goto out; |
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inode = cb->inode; ret = check_compressed_csum(inode, cb, (u64)bio->bi_sector << 9); if (ret) goto csum_failed; |
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/* ok, we're the last bio for this extent, lets start * the decompression. */ |
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ret = btrfs_decompress_biovec(cb->compress_type, cb->compressed_pages, cb->start, cb->orig_bio->bi_io_vec, cb->orig_bio->bi_vcnt, cb->compressed_len); |
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csum_failed: |
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if (ret) cb->errors = 1; /* release the compressed pages */ index = 0; for (index = 0; index < cb->nr_pages; index++) { page = cb->compressed_pages[index]; page->mapping = NULL; page_cache_release(page); } /* do io completion on the original bio */ |
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if (cb->errors) { |
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bio_io_error(cb->orig_bio); |
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} else { int bio_index = 0; struct bio_vec *bvec = cb->orig_bio->bi_io_vec; /* * we have verified the checksum already, set page * checked so the end_io handlers know about it */ |
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while (bio_index < cb->orig_bio->bi_vcnt) { |
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SetPageChecked(bvec->bv_page); bvec++; bio_index++; } |
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bio_endio(cb->orig_bio, 0); |
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} |
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/* finally free the cb struct */ kfree(cb->compressed_pages); kfree(cb); out: bio_put(bio); } /* * Clear the writeback bits on all of the file * pages for a compressed write */ static noinline int end_compressed_writeback(struct inode *inode, u64 start, unsigned long ram_size) { unsigned long index = start >> PAGE_CACHE_SHIFT; unsigned long end_index = (start + ram_size - 1) >> PAGE_CACHE_SHIFT; struct page *pages[16]; unsigned long nr_pages = end_index - index + 1; int i; int ret; |
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while (nr_pages > 0) { |
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ret = find_get_pages_contig(inode->i_mapping, index, |
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min_t(unsigned long, nr_pages, ARRAY_SIZE(pages)), pages); |
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if (ret == 0) { nr_pages -= 1; index += 1; continue; } for (i = 0; i < ret; i++) { end_page_writeback(pages[i]); page_cache_release(pages[i]); } nr_pages -= ret; index += ret; } /* the inode may be gone now */ return 0; } /* * do the cleanup once all the compressed pages hit the disk. * This will clear writeback on the file pages and free the compressed * pages. * * This also calls the writeback end hooks for the file pages so that * metadata and checksums can be updated in the file. */ static void end_compressed_bio_write(struct bio *bio, int err) { struct extent_io_tree *tree; struct compressed_bio *cb = bio->bi_private; struct inode *inode; struct page *page; unsigned long index; if (err) cb->errors = 1; /* if there are more bios still pending for this compressed * extent, just exit */ if (!atomic_dec_and_test(&cb->pending_bios)) goto out; /* ok, we're the last bio for this extent, step one is to * call back into the FS and do all the end_io operations */ inode = cb->inode; tree = &BTRFS_I(inode)->io_tree; |
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cb->compressed_pages[0]->mapping = cb->inode->i_mapping; |
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tree->ops->writepage_end_io_hook(cb->compressed_pages[0], cb->start, cb->start + cb->len - 1, NULL, 1); |
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cb->compressed_pages[0]->mapping = NULL; |
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end_compressed_writeback(inode, cb->start, cb->len); /* note, our inode could be gone now */ /* * release the compressed pages, these came from alloc_page and * are not attached to the inode at all */ index = 0; for (index = 0; index < cb->nr_pages; index++) { page = cb->compressed_pages[index]; page->mapping = NULL; page_cache_release(page); } /* finally free the cb struct */ kfree(cb->compressed_pages); kfree(cb); out: bio_put(bio); } /* * worker function to build and submit bios for previously compressed pages. * The corresponding pages in the inode should be marked for writeback * and the compressed pages should have a reference on them for dropping * when the IO is complete. * * This also checksums the file bytes and gets things ready for * the end io hooks. */ int btrfs_submit_compressed_write(struct inode *inode, u64 start, unsigned long len, u64 disk_start, unsigned long compressed_len, struct page **compressed_pages, unsigned long nr_pages) { struct bio *bio = NULL; struct btrfs_root *root = BTRFS_I(inode)->root; struct compressed_bio *cb; unsigned long bytes_left; struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
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int pg_index = 0; |
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struct page *page; u64 first_byte = disk_start; struct block_device *bdev; int ret; |
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int skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
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WARN_ON(start & ((u64)PAGE_CACHE_SIZE - 1)); |
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cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS); |
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if (!cb) return -ENOMEM; |
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atomic_set(&cb->pending_bios, 0); cb->errors = 0; cb->inode = inode; cb->start = start; cb->len = len; |
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cb->mirror_num = 0; |
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cb->compressed_pages = compressed_pages; cb->compressed_len = compressed_len; cb->orig_bio = NULL; cb->nr_pages = nr_pages; bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
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bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS); |
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if(!bio) { kfree(cb); return -ENOMEM; } |
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bio->bi_private = cb; bio->bi_end_io = end_compressed_bio_write; atomic_inc(&cb->pending_bios); /* create and submit bios for the compressed pages */ bytes_left = compressed_len; |
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for (pg_index = 0; pg_index < cb->nr_pages; pg_index++) { page = compressed_pages[pg_index]; |
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page->mapping = inode->i_mapping; if (bio->bi_size) ret = io_tree->ops->merge_bio_hook(page, 0, PAGE_CACHE_SIZE, bio, 0); else ret = 0; |
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page->mapping = NULL; |
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if (ret || bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { bio_get(bio); |
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/* * inc the count before we submit the bio so * we know the end IO handler won't happen before * we inc the count. Otherwise, the cb might get * freed before we're done setting it up */ atomic_inc(&cb->pending_bios); |
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ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); BUG_ON(ret); |
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if (!skip_sum) { ret = btrfs_csum_one_bio(root, inode, bio, start, 1); BUG_ON(ret); } |
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|
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ret = btrfs_map_bio(root, WRITE, bio, 0, 1); BUG_ON(ret); bio_put(bio); bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS); |
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bio->bi_private = cb; bio->bi_end_io = end_compressed_bio_write; bio_add_page(bio, page, PAGE_CACHE_SIZE, 0); } |
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if (bytes_left < PAGE_CACHE_SIZE) { printk("bytes left %lu compress len %lu nr %lu ", bytes_left, cb->compressed_len, cb->nr_pages); } |
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bytes_left -= PAGE_CACHE_SIZE; first_byte += PAGE_CACHE_SIZE; |
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cond_resched(); |
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} bio_get(bio); ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); BUG_ON(ret); |
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if (!skip_sum) { ret = btrfs_csum_one_bio(root, inode, bio, start, 1); BUG_ON(ret); } |
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ret = btrfs_map_bio(root, WRITE, bio, 0, 1); BUG_ON(ret); bio_put(bio); return 0; } |
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static noinline int add_ra_bio_pages(struct inode *inode, u64 compressed_end, struct compressed_bio *cb) { unsigned long end_index; |
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unsigned long pg_index; |
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u64 last_offset; u64 isize = i_size_read(inode); int ret; struct page *page; unsigned long nr_pages = 0; struct extent_map *em; struct address_space *mapping = inode->i_mapping; |
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struct extent_map_tree *em_tree; struct extent_io_tree *tree; u64 end; int misses = 0; page = cb->orig_bio->bi_io_vec[cb->orig_bio->bi_vcnt - 1].bv_page; last_offset = (page_offset(page) + PAGE_CACHE_SIZE); em_tree = &BTRFS_I(inode)->extent_tree; tree = &BTRFS_I(inode)->io_tree; if (isize == 0) return 0; end_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; |
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while (last_offset < compressed_end) { |
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pg_index = last_offset >> PAGE_CACHE_SHIFT; |
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|
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if (pg_index > end_index) |
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break; rcu_read_lock(); |
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page = radix_tree_lookup(&mapping->page_tree, pg_index); |
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rcu_read_unlock(); if (page) { misses++; if (misses > 4) break; goto next; } |
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page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~__GFP_FS); |
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if (!page) break; |
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if (add_to_page_cache_lru(page, mapping, pg_index, |
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GFP_NOFS)) { |
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page_cache_release(page); goto next; } |
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end = last_offset + PAGE_CACHE_SIZE - 1; /* * at this point, we have a locked page in the page cache * for these bytes in the file. But, we have to make * sure they map to this compressed extent on disk. */ set_page_extent_mapped(page); lock_extent(tree, last_offset, end, GFP_NOFS); |
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read_lock(&em_tree->lock); |
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em = lookup_extent_mapping(em_tree, last_offset, PAGE_CACHE_SIZE); |
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read_unlock(&em_tree->lock); |
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if (!em || last_offset < em->start || (last_offset + PAGE_CACHE_SIZE > extent_map_end(em)) || (em->block_start >> 9) != cb->orig_bio->bi_sector) { free_extent_map(em); unlock_extent(tree, last_offset, end, GFP_NOFS); unlock_page(page); page_cache_release(page); break; } free_extent_map(em); if (page->index == end_index) { char *userpage; size_t zero_offset = isize & (PAGE_CACHE_SIZE - 1); if (zero_offset) { int zeros; zeros = PAGE_CACHE_SIZE - zero_offset; userpage = kmap_atomic(page, KM_USER0); memset(userpage + zero_offset, 0, zeros); flush_dcache_page(page); kunmap_atomic(userpage, KM_USER0); } } ret = bio_add_page(cb->orig_bio, page, PAGE_CACHE_SIZE, 0); if (ret == PAGE_CACHE_SIZE) { nr_pages++; page_cache_release(page); } else { unlock_extent(tree, last_offset, end, GFP_NOFS); unlock_page(page); page_cache_release(page); break; } next: last_offset += PAGE_CACHE_SIZE; } |
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return 0; } |
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/* * for a compressed read, the bio we get passed has all the inode pages * in it. We don't actually do IO on those pages but allocate new ones * to hold the compressed pages on disk. * * bio->bi_sector points to the compressed extent on disk * bio->bi_io_vec points to all of the inode pages * bio->bi_vcnt is a count of pages * * After the compressed pages are read, we copy the bytes into the * bio we were passed and then call the bio end_io calls */ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, int mirror_num, unsigned long bio_flags) { struct extent_io_tree *tree; struct extent_map_tree *em_tree; struct compressed_bio *cb; struct btrfs_root *root = BTRFS_I(inode)->root; unsigned long uncompressed_len = bio->bi_vcnt * PAGE_CACHE_SIZE; unsigned long compressed_len; unsigned long nr_pages; |
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unsigned long pg_index; |
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struct page *page; struct block_device *bdev; struct bio *comp_bio; u64 cur_disk_byte = (u64)bio->bi_sector << 9; |
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u64 em_len; u64 em_start; |
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struct extent_map *em; |
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int ret = -ENOMEM; |
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u32 *sums; |
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tree = &BTRFS_I(inode)->io_tree; em_tree = &BTRFS_I(inode)->extent_tree; /* we need the actual starting offset of this extent in the file */ |
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read_lock(&em_tree->lock); |
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em = lookup_extent_mapping(em_tree, page_offset(bio->bi_io_vec->bv_page), PAGE_CACHE_SIZE); |
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read_unlock(&em_tree->lock); |
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|
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compressed_len = em->block_len; cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS); |
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if (!cb) goto out; |
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atomic_set(&cb->pending_bios, 0); cb->errors = 0; cb->inode = inode; |
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cb->mirror_num = mirror_num; sums = &cb->sums; |
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cb->start = em->orig_start; |
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em_len = em->len; em_start = em->start; |
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|
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free_extent_map(em); |
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em = NULL; |
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cb->len = uncompressed_len; cb->compressed_len = compressed_len; |
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cb->compress_type = extent_compress_type(bio_flags); |
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cb->orig_bio = bio; nr_pages = (compressed_len + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE; |
6b82ce8d8 btrfs: fix unchec... |
596 |
cb->compressed_pages = kzalloc(sizeof(struct page *) * nr_pages, |
c8b978188 Btrfs: Add zlib c... |
597 |
GFP_NOFS); |
6b82ce8d8 btrfs: fix unchec... |
598 599 |
if (!cb->compressed_pages) goto fail1; |
c8b978188 Btrfs: Add zlib c... |
600 |
bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
306e16ce1 btrfs: rename var... |
601 602 |
for (pg_index = 0; pg_index < nr_pages; pg_index++) { cb->compressed_pages[pg_index] = alloc_page(GFP_NOFS | |
c8b978188 Btrfs: Add zlib c... |
603 |
__GFP_HIGHMEM); |
306e16ce1 btrfs: rename var... |
604 |
if (!cb->compressed_pages[pg_index]) |
6b82ce8d8 btrfs: fix unchec... |
605 |
goto fail2; |
c8b978188 Btrfs: Add zlib c... |
606 607 |
} cb->nr_pages = nr_pages; |
e04ca626b Btrfs: Fix use af... |
608 |
add_ra_bio_pages(inode, em_start + em_len, cb); |
771ed689d Btrfs: Optimize c... |
609 |
|
771ed689d Btrfs: Optimize c... |
610 611 612 |
/* include any pages we added in add_ra-bio_pages */ uncompressed_len = bio->bi_vcnt * PAGE_CACHE_SIZE; cb->len = uncompressed_len; |
c8b978188 Btrfs: Add zlib c... |
613 |
comp_bio = compressed_bio_alloc(bdev, cur_disk_byte, GFP_NOFS); |
6b82ce8d8 btrfs: fix unchec... |
614 615 |
if (!comp_bio) goto fail2; |
c8b978188 Btrfs: Add zlib c... |
616 617 618 |
comp_bio->bi_private = cb; comp_bio->bi_end_io = end_compressed_bio_read; atomic_inc(&cb->pending_bios); |
306e16ce1 btrfs: rename var... |
619 620 |
for (pg_index = 0; pg_index < nr_pages; pg_index++) { page = cb->compressed_pages[pg_index]; |
c8b978188 Btrfs: Add zlib c... |
621 |
page->mapping = inode->i_mapping; |
d20f7043f Btrfs: move data ... |
622 |
page->index = em_start >> PAGE_CACHE_SHIFT; |
c8b978188 Btrfs: Add zlib c... |
623 624 625 626 627 628 |
if (comp_bio->bi_size) ret = tree->ops->merge_bio_hook(page, 0, PAGE_CACHE_SIZE, comp_bio, 0); else ret = 0; |
70b99e695 Btrfs: Compressio... |
629 |
page->mapping = NULL; |
c8b978188 Btrfs: Add zlib c... |
630 631 632 633 634 635 |
if (ret || bio_add_page(comp_bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) { bio_get(comp_bio); ret = btrfs_bio_wq_end_io(root->fs_info, comp_bio, 0); BUG_ON(ret); |
af09abfec Btrfs: make sure ... |
636 637 638 639 640 641 642 |
/* * inc the count before we submit the bio so * we know the end IO handler won't happen before * we inc the count. Otherwise, the cb might get * freed before we're done setting it up */ atomic_inc(&cb->pending_bios); |
6cbff00f4 Btrfs: implement ... |
643 |
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { |
c2db1073f Btrfs: check retu... |
644 645 646 |
ret = btrfs_lookup_bio_sums(root, inode, comp_bio, sums); BUG_ON(ret); |
d20f7043f Btrfs: move data ... |
647 648 649 650 651 652 |
} sums += (comp_bio->bi_size + root->sectorsize - 1) / root->sectorsize; ret = btrfs_map_bio(root, READ, comp_bio, mirror_num, 0); |
c8b978188 Btrfs: Add zlib c... |
653 654 655 656 657 658 |
BUG_ON(ret); bio_put(comp_bio); comp_bio = compressed_bio_alloc(bdev, cur_disk_byte, GFP_NOFS); |
771ed689d Btrfs: Optimize c... |
659 660 661 662 |
comp_bio->bi_private = cb; comp_bio->bi_end_io = end_compressed_bio_read; bio_add_page(comp_bio, page, PAGE_CACHE_SIZE, 0); |
c8b978188 Btrfs: Add zlib c... |
663 664 665 666 667 668 669 |
} cur_disk_byte += PAGE_CACHE_SIZE; } bio_get(comp_bio); ret = btrfs_bio_wq_end_io(root->fs_info, comp_bio, 0); BUG_ON(ret); |
c2db1073f Btrfs: check retu... |
670 671 672 673 |
if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { ret = btrfs_lookup_bio_sums(root, inode, comp_bio, sums); BUG_ON(ret); } |
d20f7043f Btrfs: move data ... |
674 675 |
ret = btrfs_map_bio(root, READ, comp_bio, mirror_num, 0); |
c8b978188 Btrfs: Add zlib c... |
676 677 678 679 |
BUG_ON(ret); bio_put(comp_bio); return 0; |
6b82ce8d8 btrfs: fix unchec... |
680 681 |
fail2: |
306e16ce1 btrfs: rename var... |
682 683 |
for (pg_index = 0; pg_index < nr_pages; pg_index++) free_page((unsigned long)cb->compressed_pages[pg_index]); |
6b82ce8d8 btrfs: fix unchec... |
684 685 686 687 688 689 690 |
kfree(cb->compressed_pages); fail1: kfree(cb); out: free_extent_map(em); return ret; |
c8b978188 Btrfs: Add zlib c... |
691 |
} |
261507a02 btrfs: Allow to a... |
692 693 694 695 696 697 698 699 700 |
static struct list_head comp_idle_workspace[BTRFS_COMPRESS_TYPES]; static spinlock_t comp_workspace_lock[BTRFS_COMPRESS_TYPES]; static int comp_num_workspace[BTRFS_COMPRESS_TYPES]; static atomic_t comp_alloc_workspace[BTRFS_COMPRESS_TYPES]; static wait_queue_head_t comp_workspace_wait[BTRFS_COMPRESS_TYPES]; struct btrfs_compress_op *btrfs_compress_op[] = { &btrfs_zlib_compress, |
a6fa6fae4 btrfs: Add lzo co... |
701 |
&btrfs_lzo_compress, |
261507a02 btrfs: Allow to a... |
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 |
}; int __init btrfs_init_compress(void) { int i; for (i = 0; i < BTRFS_COMPRESS_TYPES; i++) { INIT_LIST_HEAD(&comp_idle_workspace[i]); spin_lock_init(&comp_workspace_lock[i]); atomic_set(&comp_alloc_workspace[i], 0); init_waitqueue_head(&comp_workspace_wait[i]); } return 0; } /* * this finds an available workspace or allocates a new one * ERR_PTR is returned if things go bad. */ static struct list_head *find_workspace(int type) { struct list_head *workspace; int cpus = num_online_cpus(); int idx = type - 1; struct list_head *idle_workspace = &comp_idle_workspace[idx]; spinlock_t *workspace_lock = &comp_workspace_lock[idx]; atomic_t *alloc_workspace = &comp_alloc_workspace[idx]; wait_queue_head_t *workspace_wait = &comp_workspace_wait[idx]; int *num_workspace = &comp_num_workspace[idx]; again: spin_lock(workspace_lock); if (!list_empty(idle_workspace)) { workspace = idle_workspace->next; list_del(workspace); (*num_workspace)--; spin_unlock(workspace_lock); return workspace; } if (atomic_read(alloc_workspace) > cpus) { DEFINE_WAIT(wait); spin_unlock(workspace_lock); prepare_to_wait(workspace_wait, &wait, TASK_UNINTERRUPTIBLE); if (atomic_read(alloc_workspace) > cpus && !*num_workspace) schedule(); finish_wait(workspace_wait, &wait); goto again; } atomic_inc(alloc_workspace); spin_unlock(workspace_lock); workspace = btrfs_compress_op[idx]->alloc_workspace(); if (IS_ERR(workspace)) { atomic_dec(alloc_workspace); wake_up(workspace_wait); } return workspace; } /* * put a workspace struct back on the list or free it if we have enough * idle ones sitting around */ static void free_workspace(int type, struct list_head *workspace) { int idx = type - 1; struct list_head *idle_workspace = &comp_idle_workspace[idx]; spinlock_t *workspace_lock = &comp_workspace_lock[idx]; atomic_t *alloc_workspace = &comp_alloc_workspace[idx]; wait_queue_head_t *workspace_wait = &comp_workspace_wait[idx]; int *num_workspace = &comp_num_workspace[idx]; spin_lock(workspace_lock); if (*num_workspace < num_online_cpus()) { list_add_tail(workspace, idle_workspace); (*num_workspace)++; spin_unlock(workspace_lock); goto wake; } spin_unlock(workspace_lock); btrfs_compress_op[idx]->free_workspace(workspace); atomic_dec(alloc_workspace); wake: if (waitqueue_active(workspace_wait)) wake_up(workspace_wait); } /* * cleanup function for module exit */ static void free_workspaces(void) { struct list_head *workspace; int i; for (i = 0; i < BTRFS_COMPRESS_TYPES; i++) { while (!list_empty(&comp_idle_workspace[i])) { workspace = comp_idle_workspace[i].next; list_del(workspace); btrfs_compress_op[i]->free_workspace(workspace); atomic_dec(&comp_alloc_workspace[i]); } } } /* * given an address space and start/len, compress the bytes. * * pages are allocated to hold the compressed result and stored * in 'pages' * * out_pages is used to return the number of pages allocated. There * may be pages allocated even if we return an error * * total_in is used to return the number of bytes actually read. It * may be smaller then len if we had to exit early because we * ran out of room in the pages array or because we cross the * max_out threshold. * * total_out is used to return the total number of compressed bytes * * max_out tells us the max number of bytes that we're allowed to * stuff into pages */ int btrfs_compress_pages(int type, struct address_space *mapping, u64 start, unsigned long len, struct page **pages, unsigned long nr_dest_pages, unsigned long *out_pages, unsigned long *total_in, unsigned long *total_out, unsigned long max_out) { struct list_head *workspace; int ret; workspace = find_workspace(type); if (IS_ERR(workspace)) return -1; ret = btrfs_compress_op[type-1]->compress_pages(workspace, mapping, start, len, pages, nr_dest_pages, out_pages, total_in, total_out, max_out); free_workspace(type, workspace); return ret; } /* * pages_in is an array of pages with compressed data. * * disk_start is the starting logical offset of this array in the file * * bvec is a bio_vec of pages from the file that we want to decompress into * * vcnt is the count of pages in the biovec * * srclen is the number of bytes in pages_in * * The basic idea is that we have a bio that was created by readpages. * The pages in the bio are for the uncompressed data, and they may not * be contiguous. They all correspond to the range of bytes covered by * the compressed extent. */ int btrfs_decompress_biovec(int type, struct page **pages_in, u64 disk_start, struct bio_vec *bvec, int vcnt, size_t srclen) { struct list_head *workspace; int ret; workspace = find_workspace(type); if (IS_ERR(workspace)) return -ENOMEM; ret = btrfs_compress_op[type-1]->decompress_biovec(workspace, pages_in, disk_start, bvec, vcnt, srclen); free_workspace(type, workspace); return ret; } /* * a less complex decompression routine. Our compressed data fits in a * single page, and we want to read a single page out of it. * start_byte tells us the offset into the compressed data we're interested in */ int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page, unsigned long start_byte, size_t srclen, size_t destlen) { struct list_head *workspace; int ret; workspace = find_workspace(type); if (IS_ERR(workspace)) return -ENOMEM; ret = btrfs_compress_op[type-1]->decompress(workspace, data_in, dest_page, start_byte, srclen, destlen); free_workspace(type, workspace); return ret; } |
8e4eef7a6 btrfs: Drop __exi... |
909 |
void btrfs_exit_compress(void) |
261507a02 btrfs: Allow to a... |
910 911 912 |
{ free_workspaces(); } |
3a39c18d6 btrfs: Extract du... |
913 914 915 916 917 918 919 920 921 922 923 |
/* * Copy uncompressed data from working buffer to pages. * * buf_start is the byte offset we're of the start of our workspace buffer. * * total_out is the last byte of the buffer */ int btrfs_decompress_buf2page(char *buf, unsigned long buf_start, unsigned long total_out, u64 disk_start, struct bio_vec *bvec, int vcnt, |
306e16ce1 btrfs: rename var... |
924 |
unsigned long *pg_index, |
3a39c18d6 btrfs: Extract du... |
925 926 927 928 929 930 931 932 |
unsigned long *pg_offset) { unsigned long buf_offset; unsigned long current_buf_start; unsigned long start_byte; unsigned long working_bytes = total_out - buf_start; unsigned long bytes; char *kaddr; |
306e16ce1 btrfs: rename var... |
933 |
struct page *page_out = bvec[*pg_index].bv_page; |
3a39c18d6 btrfs: Extract du... |
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 |
/* * start byte is the first byte of the page we're currently * copying into relative to the start of the compressed data. */ start_byte = page_offset(page_out) - disk_start; /* we haven't yet hit data corresponding to this page */ if (total_out <= start_byte) return 1; /* * the start of the data we care about is offset into * the middle of our working buffer */ if (total_out > start_byte && buf_start < start_byte) { buf_offset = start_byte - buf_start; working_bytes -= buf_offset; } else { buf_offset = 0; } current_buf_start = buf_start; /* copy bytes from the working buffer into the pages */ while (working_bytes > 0) { bytes = min(PAGE_CACHE_SIZE - *pg_offset, PAGE_CACHE_SIZE - buf_offset); bytes = min(bytes, working_bytes); kaddr = kmap_atomic(page_out, KM_USER0); memcpy(kaddr + *pg_offset, buf + buf_offset, bytes); kunmap_atomic(kaddr, KM_USER0); flush_dcache_page(page_out); *pg_offset += bytes; buf_offset += bytes; working_bytes -= bytes; current_buf_start += bytes; /* check if we need to pick another page */ if (*pg_offset == PAGE_CACHE_SIZE) { |
306e16ce1 btrfs: rename var... |
974 975 |
(*pg_index)++; if (*pg_index >= vcnt) |
3a39c18d6 btrfs: Extract du... |
976 |
return 0; |
306e16ce1 btrfs: rename var... |
977 |
page_out = bvec[*pg_index].bv_page; |
3a39c18d6 btrfs: Extract du... |
978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 |
*pg_offset = 0; start_byte = page_offset(page_out) - disk_start; /* * make sure our new page is covered by this * working buffer */ if (total_out <= start_byte) return 1; /* * the next page in the biovec might not be adjacent * to the last page, but it might still be found * inside this working buffer. bump our offset pointer */ if (total_out > start_byte && current_buf_start < start_byte) { buf_offset = start_byte - buf_start; working_bytes = total_out - start_byte; current_buf_start = buf_start + buf_offset; } } } return 1; } |