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xfs: devirtualize ->m_dirnameops

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Instead of causing a relatively expensive indirect call for each
hashing and comparism of a file name in a directory just use an
inline function and a simple branch on the ASCII CI bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
[darrick: fix unused variable warning]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-11-11 12:59:26 -08:00 • committed by Darrick J. Wong
parent 537dabcfdb
commit d8d11fc703
10 changed files with 42 additions and 58 deletions
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2
fs/xfs/libxfs/xfs_dir2_node.c
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@ -875,7 +875,7 @@ xfs_dir2_leafn_lookup_for_entry(
* EEXIST immediately. If it's the first case-insensitive
* match, store the block & inode number and continue looking.
*/
cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
cmp = xfs_dir2_compname(args, dep->name, dep->namelen);
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
/* If there is a CI match block, drop it */
if (args->cmpresult != XFS_CMP_DIFFERENT &&