diff options
| -rw-r--r-- | fs/cifs/cifsfs.h | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h index 26a754f49ba1..89eab9a55f18 100644 --- a/fs/cifs/cifsfs.h +++ b/fs/cifs/cifsfs.h @@ -22,20 +22,28 @@ #ifndef _CIFSFS_H #define _CIFSFS_H +#include <linux/hash.h> + #define ROOT_I 2 /* * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down - * so that it will fit. + * so that it will fit. We use hash_64 to convert the value to 31 bits, and + * then add 1, to ensure that we don't end up with a 0 as the value. */ +#if BITS_PER_LONG == 64 static inline ino_t cifs_uniqueid_to_ino_t(u64 fileid) { - ino_t ino = (ino_t) fileid; - if (sizeof(ino_t) < sizeof(u64)) - ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; - return ino; + return (ino_t)fileid; } +#else +static inline ino_t +cifs_uniqueid_to_ino_t(u64 fileid) +{ + return (ino_t)hash_64(fileid, (sizeof(ino_t) * 8) - 1) + 1; +} +#endif extern struct file_system_type cifs_fs_type; extern const struct address_space_operations cifs_addr_ops; |