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afs: Fix getattr to report server i_size on dirs, not local size 

[ Upstream commit 45f66fa03b ]

Fix afs_getattr() to report the server's idea of the file size of a
directory rather than the local size.  The local size may differ as we edit
the local copy to avoid having to redownload it and we may end up with a
differently structured blob of a different size.

However, if the directory is discarded from the pagecache we then download
it again and the user may see the directory file size apparently change.

Fixes: 63a4681ff3 ("afs: Locally edit directory data for mkdir/create/unlink/...")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Howells 2022-12-06 13:49:42 +00:00 committed by Greg Kroah-Hartman
parent 2cfce11132
commit 7b6ccf752a
1 changed files with 8 additions and 1 deletions
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9
fs/afs/inode.c
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@ -450,7 +450,7 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
0 : FSCACHE_ADV_SINGLE_CHUNK,
&key, sizeof(key),
&aux, sizeof(aux),
vnode->status.size));
i_size_read(&vnode->netfs.inode)));
#endif
}
@ -766,6 +766,13 @@ int afs_getattr(struct user_namespace *mnt_userns, const struct path *path,
if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
stat->nlink > 0)
stat->nlink -= 1;
/* Lie about the size of directories. We maintain a locally
* edited copy and may make different allocation decisions on
* it, but we need to give userspace the server's size.
*/
if (S_ISDIR(inode->i_mode))
stat->size = vnode->netfs.remote_i_size;
} while (need_seqretry(&vnode->cb_lock, seq));
done_seqretry(&vnode->cb_lock, seq);