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fuse: write back dirty pages before direct write in direct_io_relax mode

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In direct_io_relax mode, there can be shared mmaped files and thus dirty
pages in its page cache.  Therefore those dirty pages should be written
back to backend before direct io to avoid data loss.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
Reviewed-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Hao Xu 2023-08-01 16:06:47 +08:00 committed by Miklos Szeredi
parent e78662e818
commit b5a2a3a0b7
1 changed files with 7 additions and 0 deletions
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7
fs/fuse/file.c
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@ -1448,6 +1448,13 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
if (!ia)
return -ENOMEM;
if (fopen_direct_io && fc->direct_io_relax) {
res = filemap_write_and_wait_range(mapping, pos, pos + count - 1);
if (res) {
fuse_io_free(ia);
return res;
}
}
if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) {
if (!write)
inode_lock(inode);