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mm/filemap: fix miscalculated file range for filemap_fdatawrite_range_kick()

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iocb->ki_pos has been updated with the number of written bytes since
generic_perform_write().

Besides __filemap_fdatawrite_range() accepts the inclusive end of the
data range.

Fixes: 1d44575765 ("mm: call filemap_fdatawrite_range_kick() after IOCB_DONTCACHE issue")
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250218120209.88093-2-jefflexu@linux.alibaba.com
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jingbo Xu 2025-02-18 20:02:08 +08:00 • committed by Christian Brauner
parent b4c173dfbb
commit 8510edf191
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GPG key ID: 91C61BC06578DCA2
2 changed files with 3 additions and 3 deletions
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4
include/linux/fs.h
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@ -2975,8 +2975,8 @@ static inline ssize_t generic_write_sync(struct kiocb *iocb, ssize_t count)
} else if (iocb->ki_flags & IOCB_DONTCACHE) {
struct address_space *mapping = iocb->ki_filp->f_mapping;
filemap_fdatawrite_range_kick(mapping, iocb->ki_pos,
iocb->ki_pos + count);
filemap_fdatawrite_range_kick(mapping, iocb->ki_pos - count,
iocb->ki_pos - 1);
}
return count;

2
mm/filemap.c
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@ -445,7 +445,7 @@ 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
* @end: last (inclusive) index for writeback
*
* This is a non-integrity writeback helper, to start writing back folios
* for the indicated range.