exfat: reduce unnecessary writes during mmap write

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During mmap write, exfat_page_mkwrite() currently extends
valid_size to the end of the VMA range. For a large mapping,
this can push valid_size far beyond the page that actually
triggered the fault, resulting in unnecessary writes.

valid_size only needs to extend to the end of the page
being written.

Signed-off-by: Yuling Dong <yuling-dong@qq.com>
Reviewed-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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Yuling Dong 2026-01-15 13:05:23 +08:00 • committed by Namjae Jeon

parent 8ffe56b104

commit 0914882bdd

1 changed files with 6 additions and 9 deletions

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fs/exfat/file.c

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