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Commit 1d7ea732 authored by Alexander Zarochentsev's avatar Alexander Zarochentsev Committed by Greg Kroah-Hartman
Browse files

[PATCH] fuse: fix error case in fuse_readpages 



Don't let fuse_readpages leave the @pages list not empty when exiting
on error.

[akpm@osdl.org: kernel-doc fixes]
Signed-off-by: default avatarAlexander Zarochentsev <zam@namesys.com>
Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 9b41ea72

fs/fuse/file.c

+8 −2
Original line number Diff line number Diff line
@@ -395,14 +395,16 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, 
	struct fuse_readpages_data data;

	int err;



	err = -EIO;

	if (is_bad_inode(inode))

		return -EIO;

		goto clean_pages_up;



	data.file = file;

	data.inode = inode;

	data.req = fuse_get_req(fc);

	err = PTR_ERR(data.req);

	if (IS_ERR(data.req))

		return PTR_ERR(data.req);

		goto clean_pages_up;



	err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);

	if (!err) {
@@ -412,6 +414,10 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, 
			fuse_put_request(fc, data.req);

	}

	return err;



clean_pages_up:

	put_pages_list(pages);

	return err;

}



static size_t fuse_send_write(struct fuse_req *req, struct file *file,

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -336,6 +336,7 @@ static inline void init_page_count(struct page *page) 
}



void put_page(struct page *page);

void put_pages_list(struct list_head *pages);



void split_page(struct page *page, unsigned int order);

mm/swap.c

+20 −0
Original line number Diff line number Diff line
@@ -54,6 +54,26 @@ void put_page(struct page *page) 
}

EXPORT_SYMBOL(put_page);



/**

 * put_pages_list(): release a list of pages

 *

 * Release a list of pages which are strung together on page.lru.  Currently

 * used by read_cache_pages() and related error recovery code.

 *

 * @pages: list of pages threaded on page->lru

 */

void put_pages_list(struct list_head *pages)

{

	while (!list_empty(pages)) {

		struct page *victim;



		victim = list_entry(pages->prev, struct page, lru);

		list_del(&victim->lru);

		page_cache_release(victim);

	}

}

EXPORT_SYMBOL(put_pages_list);



/*

 * Writeback is about to end against a page which has been marked for immediate

 * reclaim.  If it still appears to be reclaimable, move it to the tail of the