From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29025 invoked by alias); 2 Apr 2009 21:05:26 -0000 Received: (qmail 28588 invoked by alias); 2 Apr 2009 21:05:22 -0000 X-SWARE-Spam-Status: No, hits=-1.9 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS X-Spam-Status: No, hits=-1.9 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS X-Spam-Check-By: sourceware.org X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on bastion.fedora.phx.redhat.com Subject: cluster: RHEL5 - libgroup/dlm_controld/gfs_controld: handle zero global_id To: cluster-cvs-relay@redhat.com X-Project: Cluster Project X-Git-Module: cluster.git X-Git-Refname: refs/heads/RHEL5 X-Git-Reftype: branch X-Git-Oldrev: 153e90ba41c74b425fb51cce875df6b9a0747f2a X-Git-Newrev: e69fc02b504cbd75b9d67ee0cecdbd84a61832ad From: David Teigland Message-Id: <20090402210457.B724A1201A5@lists.fedorahosted.org> Date: Thu, 02 Apr 2009 21:05:00 -0000 X-Scanned-By: MIMEDefang 2.58 on 172.16.52.254 Mailing-List: contact cluster-cvs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: cluster-cvs-owner@sourceware.org X-SW-Source: 2009-q2/txt/msg00008.txt.bz2 Gitweb: http://git.fedorahosted.org/git/cluster.git?p=cluster.git;a=commitdiff;h=e69fc02b504cbd75b9d67ee0cecdbd84a61832ad Commit: e69fc02b504cbd75b9d67ee0cecdbd84a61832ad Parent: 153e90ba41c74b425fb51cce875df6b9a0747f2a Author: David Teigland AuthorDate: Wed Apr 1 14:35:04 2009 -0500 Committer: David Teigland CommitterDate: Thu Apr 2 16:00:08 2009 -0500 libgroup/dlm_controld/gfs_controld: handle zero global_id bz 493207 groupd can sometimes assign global_id of 0. dlm_controld and gfs_controld now replace 0 id's from groupd with a hash of the group name. The hash function is in libgroup for convenience. Signed-off-by: David Teigland --- group/dlm_controld/group.c | 13 +++++++- group/gfs_controld/group.c | 12 +++++++ group/lib/libgroup.c | 70 ++++++++++++++++++++++++++++++++++++++++++++ group/lib/libgroup.h | 4 ++ 4 files changed, 98 insertions(+), 1 deletions(-) diff --git a/group/dlm_controld/group.c b/group/dlm_controld/group.c index 2e5b4e6..700edac 100644 --- a/group/dlm_controld/group.c +++ b/group/dlm_controld/group.c @@ -32,7 +32,6 @@ static int cb_type; static int cb_member_count; static int cb_members[MAX_GROUP_MEMBERS]; - static void stop_cbfn(group_handle_t h, void *private, char *name) { cb_action = DO_STOP; @@ -107,6 +106,16 @@ char *str_members(void) return str_members_buf; } +static unsigned int replace_zero_global_id(char *name) +{ + unsigned int new_id; + + new_id = name_to_crc(name, strlen(name)); + + log_error("replace zero id for %s with %u", name, new_id); + return new_id; +} + void process_groupd(int ci) { struct lockspace *ls; @@ -162,6 +171,8 @@ void process_groupd(int ci) case DO_SETID: log_debug("groupd callback: set_id %s %x", cb_name, cb_id); + if (!cb_id) + cb_id = replace_zero_global_id(cb_name); set_id(cb_name, cb_id); ls->global_id = cb_id; break; diff --git a/group/gfs_controld/group.c b/group/gfs_controld/group.c index f797786..3717579 100644 --- a/group/gfs_controld/group.c +++ b/group/gfs_controld/group.c @@ -99,6 +99,16 @@ char *str_members(void) return buf; } +static unsigned int replace_zero_global_id(char *name) +{ + unsigned int new_id; + + new_id = name_to_crc(name, strlen(name)); + + log_error("replace zero id for %s with %u", name, new_id); + return new_id; +} + int process_groupd(void) { struct mountgroup *mg; @@ -151,6 +161,8 @@ int process_groupd(void) case DO_SETID: log_debug("groupd cb: set_id %s %x", cb_name, cb_id); + if (!cb_id) + cb_id = replace_zero_global_id(cb_name); mg->id = cb_id; break; diff --git a/group/lib/libgroup.c b/group/lib/libgroup.c index afe8398..1fe56c7 100644 --- a/group/lib/libgroup.c +++ b/group/lib/libgroup.c @@ -519,3 +519,73 @@ int group_get_group(int level, const char *name, group_data_t *data) return rv; } +static const uint32_t crc_32_tab[] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, + 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, + 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, + 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, + 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, + 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, + 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, + 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, + 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, + 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, + 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, + 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, + 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, + 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, + 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, + 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, + 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, + 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, + 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, + 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, + 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, + 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +}; + +/** + * + * Copied from: + * + * gfs2_disk_hash - hash an array of data + * @data: the data to be hashed + * @len: the length of data to be hashed + * + * This function must produce the same results as the one in the kernel: + * crc32_le(0xFFFFFFFF, data, len) ^ 0xFFFFFFFF + * + * Take some data and convert it to a 32-bit hash. + * + * The hash function is a 32-bit CRC of the data. The algorithm uses + * the crc_32_tab table above. + * + * This may not be the fastest hash function, but it does a fair bit better + * at providing uniform results than the others I've looked at. That's + * really important for efficient directories. + * + * Returns: the hash + */ + +uint32_t name_to_crc(const char *data, int len) +{ + uint32_t hash = 0xFFFFFFFF; + + for (; len--; data++) + hash = crc_32_tab[(hash ^ *data) & 0xFF] ^ (hash >> 8); + + hash = ~hash; + + return hash; +} + diff --git a/group/lib/libgroup.h b/group/lib/libgroup.h index ed9cd9f..6d74bfd 100644 --- a/group/lib/libgroup.h +++ b/group/lib/libgroup.h @@ -94,6 +94,10 @@ typedef struct group_data { int group_get_groups(int max, int *count, group_data_t *data); int group_get_group(int level, const char *name, group_data_t *data); +/* This has nothing to do with groupd, but libgroup is a convenient place to + put it to avoid copying in both dlm_controld and gfs_controld. */ +uint32_t name_to_crc(const char *data, int len); + #ifdef __cplusplus } #endif