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mm/filemap: add filemap_fdatawrite_range_kick() helper

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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: Jens 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jens Axboe 2024-12-20 08:47:48 -07:00 • committed by Andrew Morton
parent fb7d3bc414
commit dddc559f2e
2 changed files with 20 additions and 0 deletions
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2
include/linux/fs.h
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@ -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)
{

18
mm/filemap.c
View file

@ -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