5f9e1059d9
Since several architectures support hardware-accelerated crc32c calculation, it would be nice to confirm that btrfs is actually using it. We can see an elevated use count for the module, but it doesn't actually show who the users are. This patch simply prints the name of the driver after successfully initializing the shash. Signed-off-by: Jeff Mahoney <jeffm@suse.com> [ added a helper and used in module load-time message ] Signed-off-by: David Sterba <dsterba@suse.com>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __HASH__
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#define __HASH__
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int __init btrfs_hash_init(void);
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void btrfs_hash_exit(void);
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const char* btrfs_crc32c_impl(void);
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u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length);
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static inline u64 btrfs_name_hash(const char *name, int len)
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{
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return btrfs_crc32c((u32)~1, name, len);
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}
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/*
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* Figure the key offset of an extended inode ref
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*/
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static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
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int len)
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{
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return (u64) btrfs_crc32c(parent_objectid, name, len);
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}
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#endif
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