The users of filemap_write_and_wait_range() and file_write_and_wait_range() interfaces should set the lend parameter to LLONG_MAX, rather than -1, to indicate they want to writeback to the very end-of-file, as several kernel code paths are checking the 'wbc->range_end == LLONG_MAX' conditions. Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@xxxxxxxxxxxxx> --- mm/filemap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index 65eee6ec1066..c6d066a39425 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -661,7 +661,8 @@ EXPORT_SYMBOL_GPL(filemap_range_has_writeback); * Write out and wait upon file offsets lstart->lend, inclusive. * * Note that @lend is inclusive (describes the last byte to be written) so - * that this function can be used to write to the very end-of-file (end = -1). + * that this function can be used to write to the very end-of-file (@lend = + * LLONG_MAX). * * Return: error status of the address space. */ @@ -758,7 +759,8 @@ EXPORT_SYMBOL(file_check_and_advance_wb_err); * Write out and wait upon file offsets lstart->lend, inclusive. * * Note that @lend is inclusive (describes the last byte to be written) so - * that this function can be used to write to the very end-of-file (end = -1). + * that this function can be used to write to the very end-of-file (@lend = + * LLONG_MAX). * * After writing out and waiting on the data, we check and advance the * f_wb_err cursor to the latest value, and return any errors detected there. -- 2.20.1
