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fs: dcache remove dcache_lock

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dcache_lock no longer protects anything. remove it.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin 2011-01-07 17:49:38 +11:00
commit b5c84bf6f6
40 changed files with 109 additions and 307 deletions
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5
include/linux/dcache.h
View file

@ -183,7 +183,6 @@ struct dentry_operations {
#define DCACHE_GENOCIDE 0x0200
extern spinlock_t dcache_inode_lock;
extern spinlock_t dcache_lock;
extern seqlock_t rename_lock;
static inline int dname_external(struct dentry *dentry)
@ -296,8 +295,8 @@ extern char *dentry_path(struct dentry *, char *, int);
* destroyed when it has references. dget() should never be
* called for dentries with zero reference counter. For these cases
* (preferably none, functions in dcache.c are sufficient for normal
* needs and they take necessary precautions) you should hold dcache_lock
* and call dget_locked() instead of dget().
* needs and they take necessary precautions) you should hold d_lock
* and call dget_dlock() instead of dget().
*/
static inline struct dentry *dget_dlock(struct dentry *dentry)
{

6
include/linux/fs.h
View file

@ -1378,7 +1378,7 @@ struct super_block {
#else
struct list_head s_files;
#endif
/* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
/* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
struct list_head s_dentry_lru; /* unused dentry lru */
int s_nr_dentry_unused; /* # of dentry on lru */
@ -2446,6 +2446,10 @@ static inline ino_t parent_ino(struct dentry *dentry)
{
ino_t res;
/*
* Don't strictly need d_lock here? If the parent ino could change
* then surely we'd have a deeper race in the caller?
*/
spin_lock(&dentry->d_lock);
res = dentry->d_parent->d_inode->i_ino;
spin_unlock(&dentry->d_lock);

2
include/linux/fsnotify.h
View file

@ -17,7 +17,6 @@
/*
* fsnotify_d_instantiate - instantiate a dentry for inode
* Called with dcache_lock held.
*/
static inline void fsnotify_d_instantiate(struct dentry *dentry,
struct inode *inode)
@ -62,7 +61,6 @@ static inline int fsnotify_perm(struct file *file, int mask)
/*
* fsnotify_d_move - dentry has been moved
* Called with dcache_lock and dentry->d_lock held.
*/
static inline void fsnotify_d_move(struct dentry *dentry)
{

11
include/linux/fsnotify_backend.h
View file

@ -329,9 +329,15 @@ static inline void __fsnotify_update_dcache_flags(struct dentry *dentry)
{
struct dentry *parent;
assert_spin_locked(&dcache_lock);
assert_spin_locked(&dentry->d_lock);
/*
* Serialisation of setting PARENT_WATCHED on the dentries is provided
* by d_lock. If inotify_inode_watched changes after we have taken
* d_lock, the following __fsnotify_update_child_dentry_flags call will
* find our entry, so it will spin until we complete here, and update
* us with the new state.
*/
parent = dentry->d_parent;
if (parent->d_inode && fsnotify_inode_watches_children(parent->d_inode))
dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;
@ -341,15 +347,12 @@ static inline void __fsnotify_update_dcache_flags(struct dentry *dentry)
/*
* fsnotify_d_instantiate - instantiate a dentry for inode
* Called with dcache_lock held.
*/
static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode *inode)
{
if (!inode)
return;
assert_spin_locked(&dcache_lock);
spin_lock(&dentry->d_lock);
__fsnotify_update_dcache_flags(dentry);
spin_unlock(&dentry->d_lock);

1
include/linux/namei.h
View file

@ -41,7 +41,6 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
* - require a directory
* - ending slashes ok even for nonexistent files
* - internal "there are more path components" flag
* - locked when lookup done with dcache_lock held
* - dentry cache is untrusted; force a real lookup
*/
#define LOOKUP_FOLLOW 1