Commit dddc559f authored by Jens Axboe's avatar Jens Axboe Committed by Andrew Morton
Browse files

mm/filemap: add filemap_fdatawrite_range_kick() helper 

Works like filemap_fdatawrite_range(), except it's a non-integrity data
writeback and hence only starts writeback on the specified range.  Will
help facilitate generically starting uncached writeback from
generic_write_sync(), as header dependencies preclude doing this inline
from fs.h.

Link: https://lkml.kernel.org/r/20241220154831.1086649-11-axboe@kernel.dk


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Cc: Brian Foster <bfoster@redhat.com>
Cc: Chris Mason <clm@meta.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent fb7d3bc4

include/linux/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -2878,6 +2878,8 @@ extern int __must_check file_fdatawait_range(struct file *file, loff_t lstart, 
extern int __must_check file_check_and_advance_wb_err(struct file *file);

extern int __must_check file_write_and_wait_range(struct file *file,

						loff_t start, loff_t end);

int filemap_fdatawrite_range_kick(struct address_space *mapping, loff_t start,

		loff_t end);



static inline int file_write_and_wait(struct file *file)

{

mm/filemap.c

+18 −0
Original line number Diff line number Diff line
@@ -440,6 +440,24 @@ int filemap_fdatawrite_range(struct address_space *mapping, loff_t start, 
}

EXPORT_SYMBOL(filemap_fdatawrite_range);



/**

 * filemap_fdatawrite_range_kick - start writeback on a range

 * @mapping:	target address_space

 * @start:	index to start writeback on

 * @end:	last (non-inclusive) index for writeback

 *

 * This is a non-integrity writeback helper, to start writing back folios

 * for the indicated range.

 *

 * Return: %0 on success, negative error code otherwise.

 */

int filemap_fdatawrite_range_kick(struct address_space *mapping, loff_t start,

				  loff_t end)

{

	return __filemap_fdatawrite_range(mapping, start, end, WB_SYNC_NONE);

}

EXPORT_SYMBOL_GPL(filemap_fdatawrite_range_kick);



/**

 * filemap_flush - mostly a non-blocking flush

 * @mapping:	target address_space