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author | 2021-12-06 15:25:33 -0500 | |
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committer | 2022-01-08 00:28:41 -0500 | |
commit | 25d6a23e8d280861dfe81193e18143afb2c0d777 (patch) | |
tree | 844b73af605a47e462fe777e31fb1fdcf835d67b /mm/filemap.c | |
parent | filemap: Convert filemap_read() to use a folio (diff) | |
download | linux-25d6a23e8d280861dfe81193e18143afb2c0d777.tar.gz linux-25d6a23e8d280861dfe81193e18143afb2c0d777.tar.bz2 linux-25d6a23e8d280861dfe81193e18143afb2c0d777.zip |
filemap: Convert filemap_get_read_batch() to use a folio_batch
This change ripples all the way through the filemap_read() call chain and
removes a lot of messing about converting folios to pages and back again.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r-- | mm/filemap.c | 65 |
1 files changed, 33 insertions, 32 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index ea5460e12555..aefa6082b81b 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2325,16 +2325,16 @@ static void shrink_readahead_size_eio(struct file_ra_state *ra) } /* - * filemap_get_read_batch - Get a batch of pages for read + * filemap_get_read_batch - Get a batch of folios for read * - * Get a batch of pages which represent a contiguous range of bytes - * in the file. No tail pages will be returned. If @index is in the - * middle of a THP, the entire THP will be returned. The last page in - * the batch may have Readahead set or be not Uptodate so that the - * caller can take the appropriate action. + * Get a batch of folios which represent a contiguous range of bytes in + * the file. No exceptional entries will be returned. If @index is in + * the middle of a folio, the entire folio will be returned. The last + * folio in the batch may have the readahead flag set or the uptodate flag + * clear so that the caller can take the appropriate action. */ static void filemap_get_read_batch(struct address_space *mapping, - pgoff_t index, pgoff_t max, struct pagevec *pvec) + pgoff_t index, pgoff_t max, struct folio_batch *fbatch) { XA_STATE(xas, &mapping->i_pages, index); struct folio *folio; @@ -2349,9 +2349,9 @@ static void filemap_get_read_batch(struct address_space *mapping, goto retry; if (unlikely(folio != xas_reload(&xas))) - goto put_page; + goto put_folio; - if (!pagevec_add(pvec, &folio->page)) + if (!folio_batch_add(fbatch, folio)) break; if (!folio_test_uptodate(folio)) break; @@ -2360,7 +2360,7 @@ static void filemap_get_read_batch(struct address_space *mapping, xas.xa_index = folio->index + folio_nr_pages(folio) - 1; xas.xa_offset = (xas.xa_index >> xas.xa_shift) & XA_CHUNK_MASK; continue; -put_page: +put_folio: folio_put(folio); retry: xas_reset(&xas); @@ -2475,7 +2475,7 @@ unlock_mapping: static int filemap_create_folio(struct file *file, struct address_space *mapping, pgoff_t index, - struct pagevec *pvec) + struct folio_batch *fbatch) { struct folio *folio; int error; @@ -2510,7 +2510,7 @@ static int filemap_create_folio(struct file *file, goto error; filemap_invalidate_unlock_shared(mapping); - pagevec_add(pvec, &folio->page); + folio_batch_add(fbatch, folio); return 0; error: filemap_invalidate_unlock_shared(mapping); @@ -2531,7 +2531,7 @@ static int filemap_readahead(struct kiocb *iocb, struct file *file, } static int filemap_get_pages(struct kiocb *iocb, struct iov_iter *iter, - struct pagevec *pvec) + struct folio_batch *fbatch) { struct file *filp = iocb->ki_filp; struct address_space *mapping = filp->f_mapping; @@ -2546,32 +2546,33 @@ retry: if (fatal_signal_pending(current)) return -EINTR; - filemap_get_read_batch(mapping, index, last_index, pvec); - if (!pagevec_count(pvec)) { + filemap_get_read_batch(mapping, index, last_index, fbatch); + if (!folio_batch_count(fbatch)) { if (iocb->ki_flags & IOCB_NOIO) return -EAGAIN; page_cache_sync_readahead(mapping, ra, filp, index, last_index - index); - filemap_get_read_batch(mapping, index, last_index, pvec); + filemap_get_read_batch(mapping, index, last_index, fbatch); } - if (!pagevec_count(pvec)) { + if (!folio_batch_count(fbatch)) { if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ)) return -EAGAIN; err = filemap_create_folio(filp, mapping, - iocb->ki_pos >> PAGE_SHIFT, pvec); + iocb->ki_pos >> PAGE_SHIFT, fbatch); if (err == AOP_TRUNCATED_PAGE) goto retry; return err; } - folio = page_folio(pvec->pages[pagevec_count(pvec) - 1]); + folio = fbatch->folios[folio_batch_count(fbatch) - 1]; if (folio_test_readahead(folio)) { err = filemap_readahead(iocb, filp, mapping, folio, last_index); if (err) goto err; } if (!folio_test_uptodate(folio)) { - if ((iocb->ki_flags & IOCB_WAITQ) && pagevec_count(pvec) > 1) + if ((iocb->ki_flags & IOCB_WAITQ) && + folio_batch_count(fbatch) > 1) iocb->ki_flags |= IOCB_NOWAIT; err = filemap_update_page(iocb, mapping, iter, folio); if (err) @@ -2582,7 +2583,7 @@ retry: err: if (err < 0) folio_put(folio); - if (likely(--pvec->nr)) + if (likely(--fbatch->nr)) return 0; if (err == AOP_TRUNCATED_PAGE) goto retry; @@ -2609,7 +2610,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, struct file_ra_state *ra = &filp->f_ra; struct address_space *mapping = filp->f_mapping; struct inode *inode = mapping->host; - struct pagevec pvec; + struct folio_batch fbatch; int i, error = 0; bool writably_mapped; loff_t isize, end_offset; @@ -2620,7 +2621,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, return 0; iov_iter_truncate(iter, inode->i_sb->s_maxbytes); - pagevec_init(&pvec); + folio_batch_init(&fbatch); do { cond_resched(); @@ -2636,7 +2637,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, if (unlikely(iocb->ki_pos >= i_size_read(inode))) break; - error = filemap_get_pages(iocb, iter, &pvec); + error = filemap_get_pages(iocb, iter, &fbatch); if (error < 0) break; @@ -2650,7 +2651,7 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, */ isize = i_size_read(inode); if (unlikely(iocb->ki_pos >= isize)) - goto put_pages; + goto put_folios; end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count); /* @@ -2665,10 +2666,10 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, */ if (iocb->ki_pos >> PAGE_SHIFT != ra->prev_pos >> PAGE_SHIFT) - mark_page_accessed(pvec.pages[0]); + folio_mark_accessed(fbatch.folios[0]); - for (i = 0; i < pagevec_count(&pvec); i++) { - struct folio *folio = page_folio(pvec.pages[i]); + for (i = 0; i < folio_batch_count(&fbatch); i++) { + struct folio *folio = fbatch.folios[i]; size_t fsize = folio_size(folio); size_t offset = iocb->ki_pos & (fsize - 1); size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos, @@ -2698,10 +2699,10 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, break; } } -put_pages: - for (i = 0; i < pagevec_count(&pvec); i++) - put_page(pvec.pages[i]); - pagevec_reinit(&pvec); +put_folios: + for (i = 0; i < folio_batch_count(&fbatch); i++) + folio_put(fbatch.folios[i]); + folio_batch_init(&fbatch); } while (iov_iter_count(iter) && iocb->ki_pos < isize && !error); file_accessed(filp); |