diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/filemap.c | 49 | ||||
| -rw-r--r-- | mm/swapfile.c | 3 |
2 files changed, 38 insertions, 14 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 5dfc093ceb3d..070e7547d5b5 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1726,7 +1726,7 @@ int generic_file_readonly_mmap(struct file * file, struct vm_area_struct * vma) EXPORT_SYMBOL(generic_file_mmap); EXPORT_SYMBOL(generic_file_readonly_mmap); -static inline struct page *__read_cache_page(struct address_space *mapping, +static struct page *__read_cache_page(struct address_space *mapping, unsigned long index, int (*filler)(void *,struct page*), void *data) @@ -1763,17 +1763,11 @@ repeat: return page; } -/** - * read_cache_page - read into page cache, fill it if needed - * @mapping: the page's address_space - * @index: the page index - * @filler: function to perform the read - * @data: destination for read data - * - * Read into the page cache. If a page already exists, - * and PageUptodate() is not set, try to fill the page. +/* + * Same as read_cache_page, but don't wait for page to become unlocked + * after submitting it to the filler. */ -struct page *read_cache_page(struct address_space *mapping, +struct page *read_cache_page_async(struct address_space *mapping, unsigned long index, int (*filler)(void *,struct page*), void *data) @@ -1805,6 +1799,39 @@ retry: page = ERR_PTR(err); } out: + mark_page_accessed(page); + return page; +} +EXPORT_SYMBOL(read_cache_page_async); + +/** + * read_cache_page - read into page cache, fill it if needed + * @mapping: the page's address_space + * @index: the page index + * @filler: function to perform the read + * @data: destination for read data + * + * Read into the page cache. If a page already exists, and PageUptodate() is + * not set, try to fill the page then wait for it to become unlocked. + * + * If the page does not get brought uptodate, return -EIO. + */ +struct page *read_cache_page(struct address_space *mapping, + unsigned long index, + int (*filler)(void *,struct page*), + void *data) +{ + struct page *page; + + page = read_cache_page_async(mapping, index, filler, data); + if (IS_ERR(page)) + goto out; + wait_on_page_locked(page); + if (!PageUptodate(page)) { + page_cache_release(page); + page = ERR_PTR(-EIO); + } + out: return page; } EXPORT_SYMBOL(read_cache_page); diff --git a/mm/swapfile.c b/mm/swapfile.c index a2d9bb4e80df..acc172cbe3aa 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1531,9 +1531,6 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) error = PTR_ERR(page); goto bad_swap; } - wait_on_page_locked(page); - if (!PageUptodate(page)) - goto bad_swap; kmap(page); swap_header = page_address(page); |
