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fuse: Invalidate the page cache after FOPEN_DIRECT_IO write

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generic_file_direct_write() also does this and has a large
comment about.

Reproducer here is xfstest's generic/209, which is exactly to
have competing DIO write and cached IO read.

Signed-off-by: Bernd Schubert <bschubert@ddn.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Bernd Schubert 2025-10-23 00:21:17 +02:00 committed by Miklos Szeredi
parent 47781ee71f
commit b359af8275
1 changed files with 9 additions and 0 deletions
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9
fs/fuse/file.c
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@ -1693,6 +1693,15 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
if (res > 0) if (res > 0)
*ppos = pos; *ppos = pos;
if (res > 0 && write && fopen_direct_io) {
/*
* As in generic_file_direct_write(), invalidate after the
* write, to invalidate read-ahead cache that may have competed
* with the write.
*/
invalidate_inode_pages2_range(mapping, idx_from, idx_to);
}
return res > 0 ? res : err; return res > 0 ? res : err;
} }
EXPORT_SYMBOL_GPL(fuse_direct_io); EXPORT_SYMBOL_GPL(fuse_direct_io);