2  * Squashfs - a compressed read only filesystem for Linux
19  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
46 static int squashfs_symlink_readpage(struct file *file, struct page *page)  in squashfs_symlink_readpage()  argument
48 	struct inode *inode = page->mapping->host;  in squashfs_symlink_readpage()
49 	struct super_block *sb = inode->i_sb;  in squashfs_symlink_readpage()
50 	struct squashfs_sb_info *msblk = sb->s_fs_info;  in squashfs_symlink_readpage()
51 	int index = page->index << PAGE_CACHE_SHIFT;  in squashfs_symlink_readpage()  local
52 	u64 block = squashfs_i(inode)->start;  in squashfs_symlink_readpage()
53 	int offset = squashfs_i(inode)->offset;  in squashfs_symlink_readpage()
54 	int length = min_t(int, i_size_read(inode) - index, PAGE_CACHE_SIZE);  in squashfs_symlink_readpage()
59 	TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "  in squashfs_symlink_readpage()
60 			"%llx, offset %x\n", page->index, block, offset);  in squashfs_symlink_readpage()
63 	 * Skip index bytes into symlink metadata.  in squashfs_symlink_readpage()
65 	if (index) {  in squashfs_symlink_readpage()
67 								index);  in squashfs_symlink_readpage()
70 				squashfs_i(inode)->start,  in squashfs_symlink_readpage()
71 				squashfs_i(inode)->offset);  in squashfs_symlink_readpage()
79 	 * kmap_atomic to map the page.  Instead call the underlying  in squashfs_symlink_readpage()
84 		entry = squashfs_cache_get(sb, msblk->block_cache, block, 0);  in squashfs_symlink_readpage()
85 		if (entry->error) {  in squashfs_symlink_readpage()
87 				squashfs_i(inode)->start,  in squashfs_symlink_readpage()
88 				squashfs_i(inode)->offset);  in squashfs_symlink_readpage()
93 		pageaddr = kmap_atomic(page, KM_USER0);  in squashfs_symlink_readpage()
95 								length - bytes);  in squashfs_symlink_readpage()
96 		if (copied == length - bytes)  in squashfs_symlink_readpage()
97 			memset(pageaddr + length, 0, PAGE_CACHE_SIZE - length);  in squashfs_symlink_readpage()
99 			block = entry->next_index;  in squashfs_symlink_readpage()
104 	flush_dcache_page(page);  in squashfs_symlink_readpage()
105 	SetPageUptodate(page);  in squashfs_symlink_readpage()
106 	unlock_page(page);  in squashfs_symlink_readpage()
110 	SetPageError(page);  in squashfs_symlink_readpage()
111 	unlock_page(page);  in squashfs_symlink_readpage()