diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-08-12 16:06:31 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-08-22 08:58:16 -0400 |
| commit | 1264a2f053a32376696e51184f086d35113e75ff (patch) | |
| tree | 3753683f3c47273e616c4221faf2eba7829ace89 | |
| parent | c2dd1378fa3b52ab1705f1ce0bd46d1b91eb1d58 (diff) | |
NFS: refactor code for calculating the crc32 hash of a filehandle
We want to be able to display the crc32 hash of the filehandle in
tracepoints.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
| -rw-r--r-- | fs/nfs/inode.c | 3 | ||||
| -rw-r--r-- | fs/nfs/internal.h | 20 |
2 files changed, 21 insertions, 2 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index af6e806044d7..9a98b04c4445 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -38,7 +38,6 @@ #include <linux/slab.h> #include <linux/compat.h> #include <linux/freezer.h> -#include <linux/crc32.h> #include <asm/uaccess.h> @@ -1190,7 +1189,7 @@ u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) { /* wireshark uses 32-bit AUTODIN crc and does a bitwise * not on the result */ - return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size); + return nfs_fhandle_hash(fh); } /* diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 9b694f1e06c5..50f7068903b9 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -5,6 +5,7 @@ #include "nfs4_fs.h" #include <linux/mount.h> #include <linux/security.h> +#include <linux/crc32.h> #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) @@ -574,3 +575,22 @@ u64 nfs_timespec_to_change_attr(const struct timespec *ts) { return ((u64)ts->tv_sec << 30) + ts->tv_nsec; } + +#ifdef CONFIG_CRC32 +/** + * nfs_fhandle_hash - calculate the crc32 hash for the filehandle + * @fh - pointer to filehandle + * + * returns a crc32 hash for the filehandle that is compatible with + * the one displayed by "wireshark". + */ +static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) +{ + return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); +} +#else +static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) +{ + return 0; +} +#endif |