On Fri, 23 Mar 2012 13:46:35 -0700 (PDT) Hugh Dickins <hughd@xxxxxxxxxx> wrote: > +/** > + * truncate_pagecache_range - unmap and remove pagecache that is hole-punched > + * @inode: inode > + * @lstart: offset of beginning of hole > + * @lend: offset of last byte of hole > + * > + * This function should typically be called before the filesystem > + * releases resources associated with the freed range (eg. deallocates > + * blocks). This way, pagecache will always stay logically coherent > + * with on-disk format, and the filesystem would not have to deal with > + * situations such as writepage being called for a page that has already > + * had its underlying blocks deallocated. > + */ --- a/mm/truncate.c~mm-for-fs-add-truncate_pagecache_range-fix +++ a/mm/truncate.c @@ -639,6 +639,9 @@ int vmtruncate_range(struct inode *inode * with on-disk format, and the filesystem would not have to deal with * situations such as writepage being called for a page that has already * had its underlying blocks deallocated. + * + * Must be called with inode->i_mapping->i_mutex held. + * Takes inode->i_mapping->i_mmap_mutex. */ void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend) { yes? -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html