New code for 5.15:
- Simplify the bio_end_page usage in the buffered IO code. - Support reading inline data at nonzero offsets for erofs. - Fix some typos and bad grammar. - Convert kmap_atomic usage in the inline data read path. - Add some extra inline data input checking. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAmEMIYMACgkQ+H93GTRK tOt/Sg//S4VFZAc2mq5Oc54v+0I3AUTL5M70ZdVB/b7HgfPFfJjglDxt/skSEeh3 6GEFMIWU7WKf27Gg5vz/kFqlbxhMKLhMIdHgF7pzkQPiWSJIthIaHBAj6d8czBaR eVjC3bGk0CjjBxuwmj7Q+ADRbd7KZ1OrC+p91Lw1DxC6sQcW9o0Pq7vxoFRroN8H cErlHKQXGXglmZ/BbxCO2LLxo4Gv4WnGyHU/iwn13UogQ6RYY4n9Ksc+ZndOPo9L 68SiPLG+MazN50K/bAW2GVl592emNmrZQNNjffCMdwWnFQqFj2xrvuy6iRPTHrW1 PaI5IGRXPhhKw6qi7OMs+RKVeCRZy2xo4oWsJL62qKByyrKP3n1MRfiIaNa6rDvG LTMDDSpIQCnWProkqmgWTxK5AAakh2C47XV0k0XmEYQUntHOuI4mZBmKC677GbJ7 DU0rUgkYPYaugtGxAhoFPW2ok2jBF1iWYHxwN8l/NX3s36/N5pyIvDHqIHXhkpUI qGFsMap837ein3cNbz8I/HhU6YVpHWV8s+z9vufW9MC/IIaxTbhPU6Bnnmsk/qCJ 4tZT7LWsYsg19z6xZ9j1EKkqo7G+0/kpW6vV8aJCl1qCRguUvfwDr0T4daLIEk6r meNXhWSRwMUPWnRJP363PwJ0QU67+AuFCaerVO+bT3wM0HFvbWg= =4Rvm -----END PGP SIGNATURE----- Merge tag 'iomap-5.15-merge-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git Pull 'iomap-5.15-merge-2' to support EROFS iomap tail-packing inline: - Simplify the bio_end_page usage in the buffered IO code. - Support reading inline data at nonzero offsets for erofs. - Fix some typos and bad grammar. - Convert kmap_atomic usage in the inline data read path. - Add some extra inline data input checking. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang
commit
61dc131cec
@ -36,7 +36,7 @@ static inline struct iomap_page *to_iomap_page(struct page *page)
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{
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/*
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* per-block data is stored in the head page. Callers should
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* not be dealing with tail pages (and if they are, they can
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* not be dealing with tail pages, and if they are, they can
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* call thp_head() first.
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*/
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VM_BUG_ON_PGFLAGS(PageTail(page), page);
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@ -98,7 +98,7 @@ iomap_adjust_read_range(struct inode *inode, struct iomap_page *iop,
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unsigned last = (poff + plen - 1) >> block_bits;
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/*
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* If the block size is smaller than the page size we need to check the
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* If the block size is smaller than the page size, we need to check the
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* per-block uptodate status and adjust the offset and length if needed
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* to avoid reading in already uptodate ranges.
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*/
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@ -126,7 +126,7 @@ iomap_adjust_read_range(struct inode *inode, struct iomap_page *iop,
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}
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/*
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* If the extent spans the block that contains the i_size we need to
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* If the extent spans the block that contains the i_size, we need to
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* handle both halves separately so that we properly zero data in the
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* page cache for blocks that are entirely outside of i_size.
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*/
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@ -205,25 +205,32 @@ struct iomap_readpage_ctx {
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struct readahead_control *rac;
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};
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static void
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iomap_read_inline_data(struct inode *inode, struct page *page,
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static int iomap_read_inline_data(struct inode *inode, struct page *page,
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struct iomap *iomap)
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{
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size_t size = i_size_read(inode);
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size_t size = i_size_read(inode) - iomap->offset;
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size_t poff = offset_in_page(iomap->offset);
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void *addr;
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if (PageUptodate(page))
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return;
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return PAGE_SIZE - poff;
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BUG_ON(page_has_private(page));
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BUG_ON(page->index);
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BUG_ON(size > PAGE_SIZE - offset_in_page(iomap->inline_data));
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if (WARN_ON_ONCE(size > PAGE_SIZE - poff))
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return -EIO;
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if (WARN_ON_ONCE(size > PAGE_SIZE -
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offset_in_page(iomap->inline_data)))
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return -EIO;
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if (WARN_ON_ONCE(size > iomap->length))
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return -EIO;
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if (poff > 0)
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iomap_page_create(inode, page);
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addr = kmap_atomic(page);
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addr = kmap_local_page(page) + poff;
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memcpy(addr, iomap->inline_data, size);
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memset(addr + size, 0, PAGE_SIZE - size);
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kunmap_atomic(addr);
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SetPageUptodate(page);
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memset(addr + size, 0, PAGE_SIZE - poff - size);
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kunmap_local(addr);
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iomap_set_range_uptodate(page, poff, PAGE_SIZE - poff);
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return PAGE_SIZE - poff;
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}
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static inline bool iomap_block_needs_zeroing(struct inode *inode,
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@ -241,16 +248,12 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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struct iomap_readpage_ctx *ctx = data;
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struct page *page = ctx->cur_page;
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struct iomap_page *iop;
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bool same_page = false, is_contig = false;
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loff_t orig_pos = pos;
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unsigned poff, plen;
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sector_t sector;
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if (iomap->type == IOMAP_INLINE) {
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WARN_ON_ONCE(pos);
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iomap_read_inline_data(inode, page, iomap);
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return PAGE_SIZE;
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}
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if (iomap->type == IOMAP_INLINE)
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return iomap_read_inline_data(inode, page, iomap);
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/* zero post-eof blocks as the page may be mapped */
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iop = iomap_page_create(inode, page);
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@ -268,16 +271,10 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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if (iop)
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atomic_add(plen, &iop->read_bytes_pending);
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/* Try to merge into a previous segment if we can */
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sector = iomap_sector(iomap, pos);
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if (ctx->bio && bio_end_sector(ctx->bio) == sector) {
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if (__bio_try_merge_page(ctx->bio, page, plen, poff,
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&same_page))
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goto done;
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is_contig = true;
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}
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if (!is_contig || bio_full(ctx->bio, plen)) {
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if (!ctx->bio ||
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bio_end_sector(ctx->bio) != sector ||
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bio_add_page(ctx->bio, page, plen, poff) != plen) {
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gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
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gfp_t orig_gfp = gfp;
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unsigned int nr_vecs = DIV_ROUND_UP(length, PAGE_SIZE);
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@ -301,13 +298,12 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
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ctx->bio->bi_iter.bi_sector = sector;
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bio_set_dev(ctx->bio, iomap->bdev);
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ctx->bio->bi_end_io = iomap_read_end_io;
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__bio_add_page(ctx->bio, page, plen, poff);
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}
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bio_add_page(ctx->bio, page, plen, poff);
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done:
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/*
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* Move the caller beyond our range so that it keeps making progress.
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* For that we have to include any leading non-uptodate ranges, but
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* For that, we have to include any leading non-uptodate ranges, but
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* we can skip trailing ones as they will be handled in the next
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* iteration.
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*/
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@ -344,9 +340,9 @@ iomap_readpage(struct page *page, const struct iomap_ops *ops)
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}
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/*
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* Just like mpage_readahead and block_read_full_page we always
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* Just like mpage_readahead and block_read_full_page, we always
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* return 0 and just mark the page as PageError on errors. This
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* should be cleaned up all through the stack eventually.
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* should be cleaned up throughout the stack eventually.
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*/
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return 0;
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}
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@ -467,7 +463,7 @@ iomap_releasepage(struct page *page, gfp_t gfp_mask)
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/*
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* mm accommodates an old ext3 case where clean pages might not have had
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* the dirty bit cleared. Thus, it can send actual dirty pages to
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* ->releasepage() via shrink_active_list(), skip those here.
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* ->releasepage() via shrink_active_list(); skip those here.
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*/
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if (PageDirty(page) || PageWriteback(page))
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return 0;
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@ -482,7 +478,7 @@ iomap_invalidatepage(struct page *page, unsigned int offset, unsigned int len)
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trace_iomap_invalidatepage(page->mapping->host, offset, len);
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/*
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* If we are invalidating the entire page, clear the dirty state from it
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* If we're invalidating the entire page, clear the dirty state from it
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* and release it to avoid unnecessary buildup of the LRU.
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*/
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if (offset == 0 && len == PAGE_SIZE) {
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@ -589,6 +585,20 @@ __iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, int flags,
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return 0;
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}
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static int iomap_write_begin_inline(struct inode *inode,
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struct page *page, struct iomap *srcmap)
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{
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int ret;
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/* needs more work for the tailpacking case; disable for now */
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if (WARN_ON_ONCE(srcmap->offset != 0))
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return -EIO;
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ret = iomap_read_inline_data(inode, page, srcmap);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int
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iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, struct iomap *iomap, struct iomap *srcmap)
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@ -618,7 +628,7 @@ iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
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}
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if (srcmap->type == IOMAP_INLINE)
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iomap_read_inline_data(inode, page, srcmap);
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status = iomap_write_begin_inline(inode, page, srcmap);
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else if (iomap->flags & IOMAP_F_BUFFER_HEAD)
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status = __block_write_begin_int(page, pos, len, NULL, srcmap);
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else
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@ -650,13 +660,13 @@ static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len,
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/*
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* The blocks that were entirely written will now be uptodate, so we
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* don't have to worry about a readpage reading them and overwriting a
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* partial write. However if we have encountered a short write and only
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* partial write. However, if we've encountered a short write and only
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* partially written into a block, it will not be marked uptodate, so a
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* readpage might come in and destroy our partial write.
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*
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* Do the simplest thing, and just treat any short write to a non
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* uptodate page as a zero-length write, and force the caller to redo
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* the whole thing.
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* Do the simplest thing and just treat any short write to a
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* non-uptodate page as a zero-length write, and force the caller to
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* redo the whole thing.
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*/
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if (unlikely(copied < len && !PageUptodate(page)))
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return 0;
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@ -671,12 +681,12 @@ static size_t iomap_write_end_inline(struct inode *inode, struct page *page,
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void *addr;
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WARN_ON_ONCE(!PageUptodate(page));
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BUG_ON(pos + copied > PAGE_SIZE - offset_in_page(iomap->inline_data));
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BUG_ON(!iomap_inline_data_valid(iomap));
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flush_dcache_page(page);
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addr = kmap_atomic(page);
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memcpy(iomap->inline_data + pos, addr + pos, copied);
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kunmap_atomic(addr);
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addr = kmap_local_page(page) + pos;
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memcpy(iomap_inline_data(iomap, pos), addr, copied);
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kunmap_local(addr);
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mark_inode_dirty(inode);
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return copied;
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@ -744,7 +754,7 @@ again:
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bytes = length;
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/*
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* Bring in the user page that we will copy from _first_.
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* Bring in the user page that we'll copy from _first_.
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* Otherwise there's a nasty deadlock on copying from the
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* same page as we're writing to, without it being marked
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* up-to-date.
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@ -1153,7 +1163,7 @@ static void iomap_writepage_end_bio(struct bio *bio)
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* Submit the final bio for an ioend.
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*
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* If @error is non-zero, it means that we have a situation where some part of
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* the submission process has failed after we have marked paged for writeback
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* the submission process has failed after we've marked pages for writeback
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* and unlocked them. In this situation, we need to fail the bio instead of
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* submitting it. This typically only happens on a filesystem shutdown.
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*/
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@ -1168,7 +1178,7 @@ iomap_submit_ioend(struct iomap_writepage_ctx *wpc, struct iomap_ioend *ioend,
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error = wpc->ops->prepare_ioend(ioend, error);
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if (error) {
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/*
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* If we are failing the IO now, just mark the ioend with an
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* If we're failing the IO now, just mark the ioend with an
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* error and finish it. This will run IO completion immediately
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* as there is only one reference to the ioend at this point in
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* time.
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@ -1210,7 +1220,7 @@ iomap_alloc_ioend(struct inode *inode, struct iomap_writepage_ctx *wpc,
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/*
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* Allocate a new bio, and chain the old bio to the new one.
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*
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* Note that we have to do perform the chaining in this unintuitive order
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* Note that we have to perform the chaining in this unintuitive order
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* so that the bi_private linkage is set up in the right direction for the
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* traversal in iomap_finish_ioend().
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*/
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@ -1249,7 +1259,7 @@ iomap_can_add_to_ioend(struct iomap_writepage_ctx *wpc, loff_t offset,
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/*
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* Test to see if we have an existing ioend structure that we could append to
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* first, otherwise finish off the current ioend and start another.
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* first; otherwise finish off the current ioend and start another.
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*/
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static void
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iomap_add_to_ioend(struct inode *inode, loff_t offset, struct page *page,
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@ -1259,7 +1269,6 @@ iomap_add_to_ioend(struct inode *inode, loff_t offset, struct page *page,
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sector_t sector = iomap_sector(&wpc->iomap, offset);
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unsigned len = i_blocksize(inode);
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unsigned poff = offset & (PAGE_SIZE - 1);
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bool merged, same_page = false;
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if (!wpc->ioend || !iomap_can_add_to_ioend(wpc, offset, sector)) {
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if (wpc->ioend)
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@ -1267,19 +1276,13 @@ iomap_add_to_ioend(struct inode *inode, loff_t offset, struct page *page,
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wpc->ioend = iomap_alloc_ioend(inode, wpc, offset, sector, wbc);
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}
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merged = __bio_try_merge_page(wpc->ioend->io_bio, page, len, poff,
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&same_page);
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if (iop)
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atomic_add(len, &iop->write_bytes_pending);
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if (!merged) {
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if (bio_full(wpc->ioend->io_bio, len)) {
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wpc->ioend->io_bio =
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iomap_chain_bio(wpc->ioend->io_bio);
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}
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bio_add_page(wpc->ioend->io_bio, page, len, poff);
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if (bio_add_page(wpc->ioend->io_bio, page, len, poff) != len) {
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wpc->ioend->io_bio = iomap_chain_bio(wpc->ioend->io_bio);
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__bio_add_page(wpc->ioend->io_bio, page, len, poff);
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}
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if (iop)
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atomic_add(len, &iop->write_bytes_pending);
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wpc->ioend->io_size += len;
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wbc_account_cgroup_owner(wbc, page, len);
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}
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@ -1287,9 +1290,9 @@ iomap_add_to_ioend(struct inode *inode, loff_t offset, struct page *page,
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/*
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* We implement an immediate ioend submission policy here to avoid needing to
|
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* chain multiple ioends and hence nest mempool allocations which can violate
|
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* forward progress guarantees we need to provide. The current ioend we are
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* adding blocks to is cached on the writepage context, and if the new block
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* does not append to the cached ioend it will create a new ioend and cache that
|
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* the forward progress guarantees we need to provide. The current ioend we're
|
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* adding blocks to is cached in the writepage context, and if the new block
|
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* doesn't append to the cached ioend, it will create a new ioend and cache that
|
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* instead.
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*
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* If a new ioend is created and cached, the old ioend is returned and queued
|
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@ -1351,7 +1354,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
|
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if (unlikely(error)) {
|
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/*
|
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* Let the filesystem know what portion of the current page
|
||||
* failed to map. If the page wasn't been added to ioend, it
|
||||
* failed to map. If the page hasn't been added to ioend, it
|
||||
* won't be affected by I/O completion and we must unlock it
|
||||
* now.
|
||||
*/
|
||||
@ -1368,7 +1371,7 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc,
|
||||
unlock_page(page);
|
||||
|
||||
/*
|
||||
* Preserve the original error if there was one, otherwise catch
|
||||
* Preserve the original error if there was one; catch
|
||||
* submission errors here and propagate into subsequent ioend
|
||||
* submissions.
|
||||
*/
|
||||
@ -1395,8 +1398,8 @@ done:
|
||||
/*
|
||||
* Write out a dirty page.
|
||||
*
|
||||
* For delalloc space on the page we need to allocate space and flush it.
|
||||
* For unwritten space on the page we need to start the conversion to
|
||||
* For delalloc space on the page, we need to allocate space and flush it.
|
||||
* For unwritten space on the page, we need to start the conversion to
|
||||
* regular allocated space.
|
||||
*/
|
||||
static int
|
||||
@ -1411,7 +1414,7 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
|
||||
trace_iomap_writepage(inode, page_offset(page), PAGE_SIZE);
|
||||
|
||||
/*
|
||||
* Refuse to write the page out if we are called from reclaim context.
|
||||
* Refuse to write the page out if we're called from reclaim context.
|
||||
*
|
||||
* This avoids stack overflows when called from deeply used stacks in
|
||||
* random callers for direct reclaim or memcg reclaim. We explicitly
|
||||
@ -1456,20 +1459,20 @@ iomap_do_writepage(struct page *page, struct writeback_control *wbc, void *data)
|
||||
unsigned offset_into_page = offset & (PAGE_SIZE - 1);
|
||||
|
||||
/*
|
||||
* Skip the page if it is fully outside i_size, e.g. due to a
|
||||
* truncate operation that is in progress. We must redirty the
|
||||
* Skip the page if it's fully outside i_size, e.g. due to a
|
||||
* truncate operation that's in progress. We must redirty the
|
||||
* page so that reclaim stops reclaiming it. Otherwise
|
||||
* iomap_vm_releasepage() is called on it and gets confused.
|
||||
*
|
||||
* Note that the end_index is unsigned long, it would overflow
|
||||
* if the given offset is greater than 16TB on 32-bit system
|
||||
* and if we do check the page is fully outside i_size or not
|
||||
* via "if (page->index >= end_index + 1)" as "end_index + 1"
|
||||
* will be evaluated to 0. Hence this page will be redirtied
|
||||
* and be written out repeatedly which would result in an
|
||||
* infinite loop, the user program that perform this operation
|
||||
* will hang. Instead, we can verify this situation by checking
|
||||
* if the page to write is totally beyond the i_size or if it's
|
||||
* Note that the end_index is unsigned long. If the given
|
||||
* offset is greater than 16TB on a 32-bit system then if we
|
||||
* checked if the page is fully outside i_size with
|
||||
* "if (page->index >= end_index + 1)", "end_index + 1" would
|
||||
* overflow and evaluate to 0. Hence this page would be
|
||||
* redirtied and written out repeatedly, which would result in
|
||||
* an infinite loop; the user program performing this operation
|
||||
* would hang. Instead, we can detect this situation by
|
||||
* checking if the page is totally beyond i_size or if its
|
||||
* offset is just equal to the EOF.
|
||||
*/
|
||||
if (page->index > end_index ||
|
||||
|
||||
@ -378,23 +378,25 @@ iomap_dio_inline_actor(struct inode *inode, loff_t pos, loff_t length,
|
||||
struct iomap_dio *dio, struct iomap *iomap)
|
||||
{
|
||||
struct iov_iter *iter = dio->submit.iter;
|
||||
void *inline_data = iomap_inline_data(iomap, pos);
|
||||
size_t copied;
|
||||
|
||||
BUG_ON(pos + length > PAGE_SIZE - offset_in_page(iomap->inline_data));
|
||||
if (WARN_ON_ONCE(!iomap_inline_data_valid(iomap)))
|
||||
return -EIO;
|
||||
|
||||
if (dio->flags & IOMAP_DIO_WRITE) {
|
||||
loff_t size = inode->i_size;
|
||||
|
||||
if (pos > size)
|
||||
memset(iomap->inline_data + size, 0, pos - size);
|
||||
copied = copy_from_iter(iomap->inline_data + pos, length, iter);
|
||||
memset(iomap_inline_data(iomap, size), 0, pos - size);
|
||||
copied = copy_from_iter(inline_data, length, iter);
|
||||
if (copied) {
|
||||
if (pos + copied > size)
|
||||
i_size_write(inode, pos + copied);
|
||||
mark_inode_dirty(inode);
|
||||
}
|
||||
} else {
|
||||
copied = copy_to_iter(iomap->inline_data + pos, length, iter);
|
||||
copied = copy_to_iter(inline_data, length, iter);
|
||||
}
|
||||
dio->size += copied;
|
||||
return copied;
|
||||
|
||||
@ -97,6 +97,24 @@ iomap_sector(struct iomap *iomap, loff_t pos)
|
||||
return (iomap->addr + pos - iomap->offset) >> SECTOR_SHIFT;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns the inline data pointer for logical offset @pos.
|
||||
*/
|
||||
static inline void *iomap_inline_data(struct iomap *iomap, loff_t pos)
|
||||
{
|
||||
return iomap->inline_data + pos - iomap->offset;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check if the mapping's length is within the valid range for inline data.
|
||||
* This is used to guard against accessing data beyond the page inline_data
|
||||
* points at.
|
||||
*/
|
||||
static inline bool iomap_inline_data_valid(struct iomap *iomap)
|
||||
{
|
||||
return iomap->length <= PAGE_SIZE - offset_in_page(iomap->inline_data);
|
||||
}
|
||||
|
||||
/*
|
||||
* When a filesystem sets page_ops in an iomap mapping it returns, page_prepare
|
||||
* and page_done will be called for each page written to. This only applies to
|
||||
|
||||
Loading…
Reference in New Issue
Block a user