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ceph: invalidate pages when doing direct/sync writes 

When doing a direct/sync write, we need to invalidate the page cache in
the range being written to. If we don't do this, the cache will include
invalid data as we just did a write that avoided the page cache.

In the event that invalidation fails, just ignore the error. That likely
just means that we raced with another task doing a buffered write, in
which case we want to leave the page intact anyway.

[ jlayton: minor comment update ]

Signed-off-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luís Henriques 2022-08-25 09:31:27 -04:00 committed by Ilya Dryomov
parent f0fe1e54cf
commit b422f11504
1 changed files with 14 additions and 5 deletions
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19
fs/ceph/file.c
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@ -1636,11 +1636,6 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
return ret;
ceph_fscache_invalidate(inode, false);
ret = invalidate_inode_pages2_range(inode->i_mapping,
pos >> PAGE_SHIFT,
(pos + count - 1) >> PAGE_SHIFT);
if (ret < 0)
dout("invalidate_inode_pages2_range returned %d\n", ret);
while ((len = iov_iter_count(from)) > 0) {
size_t left;
@ -1968,6 +1963,20 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
}
ceph_clear_error_write(ci);
/*
* We successfully wrote to a range of the file. Declare
* that region of the pagecache invalid.
*/
ret = invalidate_inode_pages2_range(
inode->i_mapping,
pos >> PAGE_SHIFT,
(pos + len - 1) >> PAGE_SHIFT);
if (ret < 0) {
dout("invalidate_inode_pages2_range returned %d\n",
ret);
ret = 0;
}
pos += len;
written += len;
dout("sync_write written %d\n", written);