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vfs: move dentry name length comparison from dentry_cmp() into callers

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All callers do want to check the dentry length, but some of them can
check the length and the hash together, so doing it in dentry_cmp() can
be counter-productive.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-05-10 12:37:10 -07:00
parent 94753db5ed
commit ee983e8967
1 changed files with 6 additions and 3 deletions
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9
fs/dcache.c
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@ -192,9 +192,6 @@ static inline int dentry_string_cmp(const unsigned char *cs, const unsigned char
static inline int dentry_cmp(const struct dentry *dentry, const unsigned char *ct, unsigned tcount) static inline int dentry_cmp(const struct dentry *dentry, const unsigned char *ct, unsigned tcount)
{ {
if (dentry->d_name.len != tcount)
return 1;
/* /*
* Be careful about RCU walk racing with rename: * Be careful about RCU walk racing with rename:
* use ACCESS_ONCE to fetch the name pointer. * use ACCESS_ONCE to fetch the name pointer.
@ -1464,6 +1461,8 @@ static struct dentry *__d_instantiate_unique(struct dentry *entry,
continue; continue;
if (alias->d_parent != entry->d_parent) if (alias->d_parent != entry->d_parent)
continue; continue;
if (alias->d_name.len != len)
continue;
if (dentry_cmp(alias, name, len)) if (dentry_cmp(alias, name, len))
continue; continue;
__dget(alias); __dget(alias);
@ -1882,6 +1881,8 @@ struct dentry *__d_lookup_rcu(const struct dentry *parent,
} }
} }
if (dentry->d_name.len != len)
continue;
if (!dentry_cmp(dentry, str, len)) if (!dentry_cmp(dentry, str, len))
return dentry; return dentry;
} }
@ -1984,6 +1985,8 @@ struct dentry *__d_lookup(struct dentry *parent, struct qstr *name)
tlen, tname, name)) tlen, tname, name))
goto next; goto next;
} else { } else {
if (dentry->d_name.len != len)
goto next;
if (dentry_cmp(dentry, str, len)) if (dentry_cmp(dentry, str, len))
goto next; goto next;
} }