namei.c (b981d8b3f5e008ff10d993be633ad00564fc22cd) namei.c (afddba49d18f346e5cc2938b6ed7c512db18ca68)
1/*
2 * linux/fs/namei.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Some corrections by tytso.

--- 2715 unchanged lines hidden (view full) ---

2724 }
2725}
2726
2727int __page_symlink(struct inode *inode, const char *symname, int len,
2728 gfp_t gfp_mask)
2729{
2730 struct address_space *mapping = inode->i_mapping;
2731 struct page *page;
1/*
2 * linux/fs/namei.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Some corrections by tytso.

--- 2715 unchanged lines hidden (view full) ---

2724 }
2725}
2726
2727int __page_symlink(struct inode *inode, const char *symname, int len,
2728 gfp_t gfp_mask)
2729{
2730 struct address_space *mapping = inode->i_mapping;
2731 struct page *page;
2732 void *fsdata;
2732 int err;
2733 char *kaddr;
2734
2735retry:
2733 int err;
2734 char *kaddr;
2735
2736retry:
2736 err = -ENOMEM;
2737 page = find_or_create_page(mapping, 0, gfp_mask);
2738 if (!page)
2739 goto fail;
2740 err = mapping->a_ops->prepare_write(NULL, page, 0, len-1);
2741 if (err == AOP_TRUNCATED_PAGE) {
2742 page_cache_release(page);
2743 goto retry;
2744 }
2737 err = pagecache_write_begin(NULL, mapping, 0, len-1,
2738 AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata);
2745 if (err)
2739 if (err)
2746 goto fail_map;
2740 goto fail;
2741
2747 kaddr = kmap_atomic(page, KM_USER0);
2748 memcpy(kaddr, symname, len-1);
2749 kunmap_atomic(kaddr, KM_USER0);
2742 kaddr = kmap_atomic(page, KM_USER0);
2743 memcpy(kaddr, symname, len-1);
2744 kunmap_atomic(kaddr, KM_USER0);
2750 err = mapping->a_ops->commit_write(NULL, page, 0, len-1);
2751 if (err == AOP_TRUNCATED_PAGE) {
2752 page_cache_release(page);
2753 goto retry;
2754 }
2755 if (err)
2756 goto fail_map;
2757 /*
2758 * Notice that we are _not_ going to block here - end of page is
2759 * unmapped, so this will only try to map the rest of page, see
2760 * that it is unmapped (typically even will not look into inode -
2761 * ->i_size will be enough for everything) and zero it out.
2762 * OTOH it's obviously correct and should make the page up-to-date.
2763 */
2764 if (!PageUptodate(page)) {
2765 err = mapping->a_ops->readpage(NULL, page);
2766 if (err != AOP_TRUNCATED_PAGE)
2767 wait_on_page_locked(page);
2768 } else {
2769 unlock_page(page);
2770 }
2771 page_cache_release(page);
2745
2746 err = pagecache_write_end(NULL, mapping, 0, len-1, len-1,
2747 page, fsdata);
2772 if (err < 0)
2773 goto fail;
2748 if (err < 0)
2749 goto fail;
2750 if (err < len-1)
2751 goto retry;
2752
2774 mark_inode_dirty(inode);
2775 return 0;
2753 mark_inode_dirty(inode);
2754 return 0;
2776fail_map:
2777 unlock_page(page);
2778 page_cache_release(page);
2779fail:
2780 return err;
2781}
2782
2783int page_symlink(struct inode *inode, const char *symname, int len)
2784{
2785 return __page_symlink(inode, symname, len,
2786 mapping_gfp_mask(inode->i_mapping));

--- 42 unchanged lines hidden --- 		2755fail:
2756 return err;
2757}
2758
2759int page_symlink(struct inode *inode, const char *symname, int len)
2760{
2761 return __page_symlink(inode, symname, len,
2762 mapping_gfp_mask(inode->i_mapping));

--- 42 unchanged lines hidden ---