From: Jeff Layton <[email protected]> sync_file_range doesn't call down into the filesystem directly at all. It only kicks off writeback of pagecache pages and optionally waits on the result.
Convert sync_file_range to use errseq_t based error tracking, under the assumption that most users will prefer this behavior when errors occur. Signed-off-by: Jeff Layton <[email protected]> --- fs/sync.c | 4 ++-- include/linux/fs.h | 2 ++ mm/filemap.c | 22 ++++++++++++++++++++++ 3 files changed, 26 insertions(+), 2 deletions(-) diff --git a/fs/sync.c b/fs/sync.c index 2a54c1f22035..27d6b8bbcb6a 100644 --- a/fs/sync.c +++ b/fs/sync.c @@ -342,7 +342,7 @@ SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes, ret = 0; if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) { - ret = filemap_fdatawait_range(mapping, offset, endbyte); + ret = file_fdatawait_range(f.file, offset, endbyte); if (ret < 0) goto out_put; } @@ -355,7 +355,7 @@ SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes, } if (flags & SYNC_FILE_RANGE_WAIT_AFTER) - ret = filemap_fdatawait_range(mapping, offset, endbyte); + ret = file_fdatawait_range(f.file, offset, endbyte); out_put: fdput(f); diff --git a/include/linux/fs.h b/include/linux/fs.h index 7b5d6816542b..fb615e1eb1d4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2544,6 +2544,8 @@ extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, loff_t lend); extern bool filemap_range_has_page(struct address_space *, loff_t lstart, loff_t lend); +extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, + loff_t lend); extern int filemap_write_and_wait(struct address_space *mapping); extern int filemap_write_and_wait_range(struct address_space *mapping, loff_t lstart, loff_t lend); diff --git a/mm/filemap.c b/mm/filemap.c index a49702445ce0..bb17590d7c67 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -476,6 +476,28 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte, EXPORT_SYMBOL(filemap_fdatawait_range); /** + * file_fdatawait_range - wait for writeback to complete + * @file: file pointing to address space structure to wait for + * @start_byte: offset in bytes where the range starts + * @end_byte: offset in bytes where the range ends (inclusive) + * + * Walk the list of under-writeback pages of the address space that file + * refers to, in the given range and wait for all of them. Check error + * status of the address space vs. the file->f_wb_err cursor and return it. + * + * Since the error status of the file is advanced by this function, + * callers are responsible for checking the return value and handling and/or + * reporting the error. + */ +int file_fdatawait_range(struct file *file, loff_t start_byte, loff_t end_byte) +{ + struct address_space *mapping = file->f_mapping; + + __filemap_fdatawait_range(mapping, start_byte, end_byte); + return file_check_and_advance_wb_err(file); +} + +/** * filemap_fdatawait_keep_errors - wait for writeback without clearing errors * @mapping: address space structure to wait for * -- 2.13.3
