nfsd4: clean up downgrading code
In response to some review comments, get rid of the somewhat obscure
for-loop with bitops, and improve a comment.
Reported-by: Steve Dickson <steved@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 13f6f9f..22b065a 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -403,9 +403,11 @@
/* One each for O_RDONLY, O_WRONLY, O_RDWR: */
struct file * fi_fds[3];
/*
- * Each open or lock stateid contributes 1 to either
- * fi_access[O_RDONLY], fi_access[O_WRONLY], or both, depending
- * on open or lock mode:
+ * Each open or lock stateid contributes 0-4 to the counts
+ * below depending on which bits are set in st_access_bitmap:
+ * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
+ * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
+ * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
*/
atomic_t fi_access[2];
struct file *fi_deleg_file;