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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-12-16 11:45:30 -0500
committerMatthew Wilcox (Oracle) <willy@infradead.org>2022-01-04 13:15:34 -0500
commit539a3322f208db478db88c4a76239476defce6b1 (patch)
treebaac2207dbcd2a3847a78e436223aad27073913d /mm/filemap.c
parente292e6d644ce7ba4036494dc1b6ae1dcd79e0a86 (diff)
filemap: Add read_cache_folio and read_mapping_folio
Reimplement read_cache_page() as a wrapper around read_cache_folio(). Saves over 400 bytes of text from do_read_cache_folio() which more than makes up for the extra 100 bytes of text added to the various wrapper functions. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c97
1 files changed, 51 insertions, 46 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index fc0f1d9904d2..f98e084ffb31 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3418,35 +3418,20 @@ EXPORT_SYMBOL(filemap_page_mkwrite);
EXPORT_SYMBOL(generic_file_mmap);
EXPORT_SYMBOL(generic_file_readonly_mmap);
-static struct page *wait_on_page_read(struct page *page)
+static struct folio *do_read_cache_folio(struct address_space *mapping,
+ pgoff_t index, filler_t filler, void *data, gfp_t gfp)
{
- if (!IS_ERR(page)) {
- wait_on_page_locked(page);
- if (!PageUptodate(page)) {
- put_page(page);
- page = ERR_PTR(-EIO);
- }
- }
- return page;
-}
-
-static struct page *do_read_cache_page(struct address_space *mapping,
- pgoff_t index,
- int (*filler)(void *, struct page *),
- void *data,
- gfp_t gfp)
-{
- struct page *page;
+ struct folio *folio;
int err;
repeat:
- page = find_get_page(mapping, index);
- if (!page) {
- page = __page_cache_alloc(gfp);
- if (!page)
+ folio = filemap_get_folio(mapping, index);
+ if (!folio) {
+ folio = filemap_alloc_folio(gfp, 0);
+ if (!folio)
return ERR_PTR(-ENOMEM);
- err = add_to_page_cache_lru(page, mapping, index, gfp);
+ err = filemap_add_folio(mapping, folio, index, gfp);
if (unlikely(err)) {
- put_page(page);
+ folio_put(folio);
if (err == -EEXIST)
goto repeat;
/* Presumably ENOMEM for xarray node */
@@ -3455,21 +3440,24 @@ repeat:
filler:
if (filler)
- err = filler(data, page);
+ err = filler(data, &folio->page);
else
- err = mapping->a_ops->readpage(data, page);
+ err = mapping->a_ops->readpage(data, &folio->page);
if (err < 0) {
- put_page(page);
+ folio_put(folio);
return ERR_PTR(err);
}
- page = wait_on_page_read(page);
- if (IS_ERR(page))
- return page;
+ folio_wait_locked(folio);
+ if (!folio_test_uptodate(folio)) {
+ folio_put(folio);
+ return ERR_PTR(-EIO);
+ }
+
goto out;
}
- if (PageUptodate(page))
+ if (folio_test_uptodate(folio))
goto out;
/*
@@ -3503,23 +3491,23 @@ filler:
* avoid spurious serialisations and wakeups when multiple processes
* wait on the same page for IO to complete.
*/
- wait_on_page_locked(page);
- if (PageUptodate(page))
+ folio_wait_locked(folio);
+ if (folio_test_uptodate(folio))
goto out;
/* Distinguish between all the cases under the safety of the lock */
- lock_page(page);
+ folio_lock(folio);
/* Case c or d, restart the operation */
- if (!page->mapping) {
- unlock_page(page);
- put_page(page);
+ if (!folio->mapping) {
+ folio_unlock(folio);
+ folio_put(folio);
goto repeat;
}
/* Someone else locked and filled the page in a very small window */
- if (PageUptodate(page)) {
- unlock_page(page);
+ if (folio_test_uptodate(folio)) {
+ folio_unlock(folio);
goto out;
}
@@ -3529,16 +3517,16 @@ filler:
* Clear page error before actual read, PG_error will be
* set again if read page fails.
*/
- ClearPageError(page);
+ folio_clear_error(folio);
goto filler;
out:
- mark_page_accessed(page);
- return page;
+ folio_mark_accessed(folio);
+ return folio;
}
/**
- * read_cache_page - read into page cache, fill it if needed
+ * read_cache_folio - read into page cache, fill it if needed
* @mapping: the page's address_space
* @index: the page index
* @filler: function to perform the read
@@ -3553,10 +3541,27 @@ out:
*
* Return: up to date page on success, ERR_PTR() on failure.
*/
+struct folio *read_cache_folio(struct address_space *mapping, pgoff_t index,
+ filler_t filler, void *data)
+{
+ return do_read_cache_folio(mapping, index, filler, data,
+ mapping_gfp_mask(mapping));
+}
+EXPORT_SYMBOL(read_cache_folio);
+
+static struct page *do_read_cache_page(struct address_space *mapping,
+ pgoff_t index, filler_t *filler, void *data, gfp_t gfp)
+{
+ struct folio *folio;
+
+ folio = do_read_cache_folio(mapping, index, filler, data, gfp);
+ if (IS_ERR(folio))
+ return &folio->page;
+ return folio_file_page(folio, index);
+}
+
struct page *read_cache_page(struct address_space *mapping,
- pgoff_t index,
- int (*filler)(void *, struct page *),
- void *data)
+ pgoff_t index, filler_t *filler, void *data)
{
return do_read_cache_page(mapping, index, filler, data,
mapping_gfp_mask(mapping));