diff options
author | David S. Miller <davem@davemloft.net> | 2011-09-22 03:23:13 -0400 |
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committer | David S. Miller <davem@davemloft.net> | 2011-09-22 03:23:13 -0400 |
commit | 8decf868790b48a727d7e7ca164f2bcd3c1389c0 (patch) | |
tree | b759a5f861f842af7ea76f9011b579d06e9d5508 /fs/xfs/uuid.c | |
parent | 3fc72370186be2f9d4d6ef06d99e1caa5d92c564 (diff) | |
parent | d93dc5c4478c1fd5de85a3e8aece9aad7bbae044 (diff) |
Merge branch 'master' of github.com:davem330/net
Conflicts:
MAINTAINERS
drivers/net/Kconfig
drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
drivers/net/ethernet/broadcom/tg3.c
drivers/net/wireless/iwlwifi/iwl-pci.c
drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c
drivers/net/wireless/rt2x00/rt2800usb.c
drivers/net/wireless/wl12xx/main.c
Diffstat (limited to 'fs/xfs/uuid.c')
-rw-r--r-- | fs/xfs/uuid.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/fs/xfs/uuid.c b/fs/xfs/uuid.c new file mode 100644 index 000000000000..b83f76b6d410 --- /dev/null +++ b/fs/xfs/uuid.c @@ -0,0 +1,63 @@ +/* + * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <xfs.h> + +/* IRIX interpretation of an uuid_t */ +typedef struct { + __be32 uu_timelow; + __be16 uu_timemid; + __be16 uu_timehi; + __be16 uu_clockseq; + __be16 uu_node[3]; +} xfs_uu_t; + +/* + * uuid_getnodeuniq - obtain the node unique fields of a UUID. + * + * This is not in any way a standard or condoned UUID function; + * it just something that's needed for user-level file handles. + */ +void +uuid_getnodeuniq(uuid_t *uuid, int fsid [2]) +{ + xfs_uu_t *uup = (xfs_uu_t *)uuid; + + fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) | + be16_to_cpu(uup->uu_timemid); + fsid[1] = be32_to_cpu(uup->uu_timelow); +} + +int +uuid_is_nil(uuid_t *uuid) +{ + int i; + char *cp = (char *)uuid; + + if (uuid == NULL) + return 0; + /* implied check of version number here... */ + for (i = 0; i < sizeof *uuid; i++) + if (*cp++) return 0; /* not nil */ + return 1; /* is nil */ +} + +int +uuid_equal(uuid_t *uuid1, uuid_t *uuid2) +{ + return memcmp(uuid1, uuid2, sizeof(uuid_t)) ? 0 : 1; +} |