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| author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:49:55 +1100 |
|---|---|---|
| committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:50:28 +1100 |
| commit | fb045adb99d9b7c562dc7fef834857f78249daa1 (patch) | |
| tree | 1fd6a4024fffeec568abe100d730589bfdb81c38 /fs/isofs | |
| parent | 5f57cbcc02cf18f6b22ef4066bb10afeb8f930ff (diff) | |
| download | lwn-fb045adb99d9b7c562dc7fef834857f78249daa1.tar.gz lwn-fb045adb99d9b7c562dc7fef834857f78249daa1.zip | |
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.c | 2 | ||||
| -rw-r--r-- | fs/isofs/namei.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index d8f3a652243d..844a7903c72f 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 715f7d318046..679a849c3b27 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) |