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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:55 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:28 +1100
commitfb045adb99d9b7c562dc7fef834857f78249daa1 (patch)
tree1fd6a4024fffeec568abe100d730589bfdb81c38 /fs/isofs
parent5f57cbcc02cf18f6b22ef4066bb10afeb8f930ff (diff)
downloadlinaro-lsk-fb045adb99d9b7c562dc7fef834857f78249daa1.tar.gz
fs: dcache reduce branches in lookup path
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/isofs')
-rw-r--r--fs/isofs/inode.c2
-rw-r--r--fs/isofs/namei.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index d8f3a652243..844a7903c72 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -949,7 +949,7 @@ root_found:
table += 2;
if (opt.check == 'r')
table++;
- s->s_root->d_op = &isofs_dentry_ops[table];
+ d_set_d_op(s->s_root, &isofs_dentry_ops[table]);
kfree(opt.iocharset);
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index 715f7d31804..679a849c3b2 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -172,7 +172,7 @@ struct dentry *isofs_lookup(struct inode *dir, struct dentry *dentry, struct nam
struct inode *inode;
struct page *page;
- dentry->d_op = dir->i_sb->s_root->d_op;
+ d_set_d_op(dentry, dir->i_sb->s_root->d_op);
page = alloc_page(GFP_USER);
if (!page)