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fs: dcache reduce branches in lookup path

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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>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:55 +11:00
parent 5f57cbcc02
commit fb045adb99
63 changed files with 174 additions and 137 deletions
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16
fs/cifs/dir.c
View File

@@ -135,9 +135,9 @@ static void setup_cifs_dentry(struct cifsTconInfo *tcon,
struct inode *newinode)
{
if (tcon->nocase)
direntry->d_op = &cifs_ci_dentry_ops;
d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
direntry->d_op = &cifs_dentry_ops;
d_set_d_op(direntry, &cifs_dentry_ops);
d_instantiate(direntry, newinode);
}
@@ -421,9 +421,9 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
rc = cifs_get_inode_info_unix(&newinode, full_path,
inode->i_sb, xid);
if (pTcon->nocase)
direntry->d_op = &cifs_ci_dentry_ops;
d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
direntry->d_op = &cifs_dentry_ops;
d_set_d_op(direntry, &cifs_dentry_ops);
if (rc == 0)
d_instantiate(direntry, newinode);
@@ -604,9 +604,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
if ((rc == 0) && (newInode != NULL)) {
if (pTcon->nocase)
direntry->d_op = &cifs_ci_dentry_ops;
d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
direntry->d_op = &cifs_dentry_ops;
d_set_d_op(direntry, &cifs_dentry_ops);
d_add(direntry, newInode);
if (posix_open) {
filp = lookup_instantiate_filp(nd, direntry,
@@ -634,9 +634,9 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
rc = 0;
direntry->d_time = jiffies;
if (pTcon->nocase)
direntry->d_op = &cifs_ci_dentry_ops;
d_set_d_op(direntry, &cifs_ci_dentry_ops);
else
direntry->d_op = &cifs_dentry_ops;
d_set_d_op(direntry, &cifs_dentry_ops);
d_add(direntry, NULL);
/* if it was once a directory (but how can we tell?) we could do
shrink_dcache_parent(direntry); */