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authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-21 08:50:57 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-21 08:50:57 -0700
commit31ed8e6f93a27304c9e157dab0267772cd94eaad (patch)
tree2fd62bea73efa7e2920b0c3e1d81c425eb7bf71c /include
parent7e5cb5e151c5474b4a468f437f5038ba9f67ef4d (diff)
parent26fe575028703948880fce4355a210c76bb0536e (diff)
downloadlinux-31ed8e6f93a27304c9e157dab0267772cd94eaad.tar.gz
Merge branch 'dentry-cleanups' (dcache access cleanups and optimizations)
This branch simplifies and clarifies the dcache lookup, and allows us to do certain nice optimizations when comparing dentries. It also cleans up the interface to __d_lookup_rcu(), especially around passing the inode information around. * dentry-cleanups: vfs: make it possible to access the dentry hash/len as one 64-bit entry vfs: move dentry name length comparison from dentry_cmp() into callers vfs: do the careful dentry name access for all dentry_cmp cases vfs: remove unnecessary d_unhashed() check from __d_lookup_rcu vfs: clean up __d_lookup_rcu() and dentry_cmp() interfaces
Diffstat (limited to 'include')
-rw-r--r--include/linux/dcache.h21
1 files changed, 18 insertions, 3 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 7e11f141820..094789ff3e9 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -25,6 +25,13 @@ struct vfsmount;
#define IS_ROOT(x) ((x) == (x)->d_parent)
+/* The hash is always the low bits of hash_len */
+#ifdef __LITTLE_ENDIAN
+ #define HASH_LEN_DECLARE u32 hash; u32 len;
+#else
+ #define HASH_LEN_DECLARE u32 len; u32 hash;
+#endif
+
/*
* "quick string" -- eases parameter passing, but more importantly
* saves "metadata" about the string (ie length and the hash).
@@ -33,11 +40,19 @@ struct vfsmount;
* dentry.
*/
struct qstr {
- unsigned int hash;
- unsigned int len;
+ union {
+ struct {
+ HASH_LEN_DECLARE;
+ };
+ u64 hash_len;
+ };
const unsigned char *name;
};
+#define QSTR_INIT(n,l) { { { .len = l } }, .name = n }
+#define hashlen_hash(hashlen) ((u32) (hashlen))
+#define hashlen_len(hashlen) ((u32)((hashlen) >> 32))
+
struct dentry_stat_t {
int nr_dentry;
int nr_unused;
@@ -282,7 +297,7 @@ extern struct dentry *d_hash_and_lookup(struct dentry *, struct qstr *);
extern struct dentry *__d_lookup(struct dentry *, struct qstr *);
extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
const struct qstr *name,
- unsigned *seq, struct inode **inode);
+ unsigned *seq, struct inode *inode);
/**
* __d_rcu_to_refcount - take a refcount on dentry if sequence check is ok