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![Christoph Hellwig](/assets/img/avatar_default.png)
Currently the checksum of compressed extents is verified based on the compressed data and the lower btrfs_bio, but the actual repair process is driven by end_bio_extent_readpage on the upper btrfs_bio for the decompressed data. This has a bunch of issues, including not being able to properly communicate the failed mirror up in case that the I/O submission got preempted, a general loss of if an error was an I/O error or a checksum verification failure, but most importantly that this design causes btrfs_clean_io_failure to eventually write back the uncompressed good data onto the disk sectors that are supposed to contain compressed data. Fix this by moving the repair to the lower btrfs_bio. To do so, a fair amount of code has to be reshuffled: a) the lower btrfs_bio now needs a valid csum pointer. The easiest way to achieve that is to pass NULL btrfs_lookup_bio_sums and just use the btrfs_bio management of csums. For a compressed_bio that is split into multiple btrfs_bios this means additional memory allocations, but the code becomes a lot more regular. b) checksum verification now runs directly on the lower btrfs_bio instead of the compressed_bio. This actually nicely simplifies the end I/O processing. c) btrfs_repair_one_sector can't just look up the logical address for the file offset any more, as there is no corresponding relative offsets that apply to the file offset and the logic address for compressed extents. Instead require that the saved bvec_iter in the btrfs_bio is filled out for all read bios and use that, which again removes a fair amount of code. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Sterba <dsterba@suse.com>
287 lines
9.6 KiB
C
287 lines
9.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_EXTENT_IO_H
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#define BTRFS_EXTENT_IO_H
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#include <linux/rbtree.h>
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#include <linux/refcount.h>
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#include <linux/fiemap.h>
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#include <linux/btrfs_tree.h>
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#include "compression.h"
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#include "ulist.h"
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enum {
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EXTENT_BUFFER_UPTODATE,
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EXTENT_BUFFER_DIRTY,
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EXTENT_BUFFER_CORRUPT,
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/* this got triggered by readahead */
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EXTENT_BUFFER_READAHEAD,
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EXTENT_BUFFER_TREE_REF,
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EXTENT_BUFFER_STALE,
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EXTENT_BUFFER_WRITEBACK,
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/* read IO error */
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EXTENT_BUFFER_READ_ERR,
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EXTENT_BUFFER_UNMAPPED,
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EXTENT_BUFFER_IN_TREE,
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/* write IO error */
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EXTENT_BUFFER_WRITE_ERR,
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EXTENT_BUFFER_NO_CHECK,
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};
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/* these are flags for __process_pages_contig */
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#define PAGE_UNLOCK (1 << 0)
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/* Page starts writeback, clear dirty bit and set writeback bit */
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#define PAGE_START_WRITEBACK (1 << 1)
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#define PAGE_END_WRITEBACK (1 << 2)
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#define PAGE_SET_ORDERED (1 << 3)
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#define PAGE_SET_ERROR (1 << 4)
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#define PAGE_LOCK (1 << 5)
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/*
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* page->private values. Every page that is controlled by the extent
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* map has page->private set to one.
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*/
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#define EXTENT_PAGE_PRIVATE 1
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/*
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* The extent buffer bitmap operations are done with byte granularity instead of
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* word granularity for two reasons:
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* 1. The bitmaps must be little-endian on disk.
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* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
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* single word in a bitmap may straddle two pages in the extent buffer.
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*/
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#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
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#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
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#define BITMAP_FIRST_BYTE_MASK(start) \
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((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
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#define BITMAP_LAST_BYTE_MASK(nbits) \
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(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
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struct btrfs_bio;
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struct btrfs_root;
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struct btrfs_inode;
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struct btrfs_io_bio;
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struct btrfs_fs_info;
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struct io_failure_record;
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struct extent_io_tree;
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typedef void (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
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int mirror_num,
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enum btrfs_compression_type compress_type);
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typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode,
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struct bio *bio, u64 dio_file_offset);
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#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE)
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struct extent_buffer {
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u64 start;
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unsigned long len;
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unsigned long bflags;
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struct btrfs_fs_info *fs_info;
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spinlock_t refs_lock;
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atomic_t refs;
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atomic_t io_pages;
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int read_mirror;
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struct rcu_head rcu_head;
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pid_t lock_owner;
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/* >= 0 if eb belongs to a log tree, -1 otherwise */
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s8 log_index;
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struct rw_semaphore lock;
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struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
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struct list_head release_list;
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#ifdef CONFIG_BTRFS_DEBUG
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struct list_head leak_list;
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#endif
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};
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/*
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* Structure to record how many bytes and which ranges are set/cleared
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*/
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struct extent_changeset {
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/* How many bytes are set/cleared in this operation */
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u64 bytes_changed;
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/* Changed ranges */
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struct ulist range_changed;
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};
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static inline void extent_changeset_init(struct extent_changeset *changeset)
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{
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changeset->bytes_changed = 0;
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ulist_init(&changeset->range_changed);
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}
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static inline struct extent_changeset *extent_changeset_alloc(void)
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{
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struct extent_changeset *ret;
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ret = kmalloc(sizeof(*ret), GFP_KERNEL);
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if (!ret)
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return NULL;
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extent_changeset_init(ret);
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return ret;
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}
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static inline void extent_changeset_release(struct extent_changeset *changeset)
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{
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if (!changeset)
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return;
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changeset->bytes_changed = 0;
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ulist_release(&changeset->range_changed);
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}
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static inline void extent_changeset_free(struct extent_changeset *changeset)
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{
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if (!changeset)
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return;
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extent_changeset_release(changeset);
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kfree(changeset);
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}
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struct extent_map_tree;
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int try_release_extent_mapping(struct page *page, gfp_t mask);
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int try_release_extent_buffer(struct page *page);
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int btrfs_read_folio(struct file *file, struct folio *folio);
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int extent_write_locked_range(struct inode *inode, u64 start, u64 end);
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int extent_writepages(struct address_space *mapping,
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struct writeback_control *wbc);
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int btree_write_cache_pages(struct address_space *mapping,
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struct writeback_control *wbc);
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void extent_readahead(struct readahead_control *rac);
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int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
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u64 start, u64 len);
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int set_page_extent_mapped(struct page *page);
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void clear_page_extent_mapped(struct page *page);
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struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start, u64 owner_root, int level);
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struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start, unsigned long len);
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src);
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struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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void free_extent_buffer(struct extent_buffer *eb);
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void free_extent_buffer_stale(struct extent_buffer *eb);
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#define WAIT_NONE 0
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#define WAIT_COMPLETE 1
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#define WAIT_PAGE_LOCK 2
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int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
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int mirror_num);
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void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
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void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info,
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u64 bytenr, u64 owner_root, u64 gen, int level);
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void btrfs_readahead_node_child(struct extent_buffer *node, int slot);
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static inline int num_extent_pages(const struct extent_buffer *eb)
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{
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/*
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* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to
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* sectorsize, it's just eb->len >> PAGE_SHIFT.
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*
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* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE,
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* thus have to ensure we get at least one page.
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*/
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return (eb->len >> PAGE_SHIFT) ?: 1;
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}
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static inline int extent_buffer_uptodate(const struct extent_buffer *eb)
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{
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return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
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}
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int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
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unsigned long start, unsigned long len);
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void read_extent_buffer(const struct extent_buffer *eb, void *dst,
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unsigned long start,
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unsigned long len);
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int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb,
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void __user *dst, unsigned long start,
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unsigned long len);
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void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
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void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
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const void *src);
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void write_extent_buffer(const struct extent_buffer *eb, const void *src,
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unsigned long start, unsigned long len);
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void copy_extent_buffer_full(const struct extent_buffer *dst,
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const struct extent_buffer *src);
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void copy_extent_buffer(const struct extent_buffer *dst,
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const struct extent_buffer *src,
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unsigned long dst_offset, unsigned long src_offset,
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unsigned long len);
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void memcpy_extent_buffer(const struct extent_buffer *dst,
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unsigned long dst_offset, unsigned long src_offset,
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unsigned long len);
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void memmove_extent_buffer(const struct extent_buffer *dst,
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unsigned long dst_offset, unsigned long src_offset,
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unsigned long len);
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void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
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unsigned long len);
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int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
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unsigned long pos);
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void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
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unsigned long pos, unsigned long len);
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void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
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unsigned long start, unsigned long pos,
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unsigned long len);
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void clear_extent_buffer_dirty(const struct extent_buffer *eb);
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bool set_extent_buffer_dirty(struct extent_buffer *eb);
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void set_extent_buffer_uptodate(struct extent_buffer *eb);
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void clear_extent_buffer_uptodate(struct extent_buffer *eb);
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int extent_buffer_under_io(const struct extent_buffer *eb);
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void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
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void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
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void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
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struct page *locked_page,
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u32 bits_to_clear, unsigned long page_ops);
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int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array);
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struct bio *btrfs_bio_alloc(unsigned int nr_iovecs);
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struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size);
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void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
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int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num);
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/*
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* When IO fails, either with EIO or csum verification fails, we
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* try other mirrors that might have a good copy of the data. This
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* io_failure_record is used to record state as we go through all the
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* mirrors. If another mirror has good data, the sector is set up to date
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* and things continue. If a good mirror can't be found, the original
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* bio end_io callback is called to indicate things have failed.
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*/
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struct io_failure_record {
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struct page *page;
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u64 start;
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u64 len;
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u64 logical;
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int this_mirror;
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int failed_mirror;
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int num_copies;
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};
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int btrfs_repair_one_sector(struct inode *inode, struct btrfs_bio *failed_bbio,
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u32 bio_offset, struct page *page, unsigned int pgoff,
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submit_bio_hook_t *submit_bio_hook);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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bool find_lock_delalloc_range(struct inode *inode,
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struct page *locked_page, u64 *start,
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u64 *end);
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#endif
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struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
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u64 start);
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#ifdef CONFIG_BTRFS_DEBUG
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void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
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#else
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#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
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#endif
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#endif
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