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Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin

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* 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin: (57 commits)
  fs: scale mntget/mntput
  fs: rename vfsmount counter helpers
  fs: implement faster dentry memcmp
  fs: prefetch inode data in dcache lookup
  fs: improve scalability of pseudo filesystems
  fs: dcache per-inode inode alias locking
  fs: dcache per-bucket dcache hash locking
  bit_spinlock: add required includes
  kernel: add bl_list
  xfs: provide simple rcu-walk ACL implementation
  btrfs: provide simple rcu-walk ACL implementation
  ext2,3,4: provide simple rcu-walk ACL implementation
  fs: provide simple rcu-walk generic_check_acl implementation
  fs: provide rcu-walk aware permission i_ops
  fs: rcu-walk aware d_revalidate method
  fs: cache optimise dentry and inode for rcu-walk
  fs: dcache reduce branches in lookup path
  fs: dcache remove d_mounted
  fs: fs_struct use seqlock
  fs: rcu-walk for path lookup
  ...
This commit is contained in:
Linus Torvalds
2011-01-07 08:56:33 -08:00
parent 01539ba2a7 b3e19d924b
commit b4a45f5fe8
212 changed files with 4778 additions and 2018 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/cgroup.c
+39 -15
View File
@@ -763,6 +763,8 @@ EXPORT_SYMBOL_GPL(cgroup_unlock);
* -> cgroup_mkdir.
*/
static struct dentry *cgroup_lookup(struct inode *dir,
struct dentry *dentry, struct nameidata *nd);
static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, int mode);
static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry);
static int cgroup_populate_dir(struct cgroup *cgrp);
@@ -874,25 +876,29 @@ static void cgroup_clear_directory(struct dentry *dentry)
struct list_head *node;
BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
spin_lock(&dcache_lock);
spin_lock(&dentry->d_lock);
node = dentry->d_subdirs.next;
while (node != &dentry->d_subdirs) {
struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
list_del_init(node);
if (d->d_inode) {
/* This should never be called on a cgroup
* directory with child cgroups */
BUG_ON(d->d_inode->i_mode & S_IFDIR);
d = dget_locked(d);
spin_unlock(&dcache_lock);
dget_dlock(d);
spin_unlock(&d->d_lock);
spin_unlock(&dentry->d_lock);
d_delete(d);
simple_unlink(dentry->d_inode, d);
dput(d);
spin_lock(&dcache_lock);
}
spin_lock(&dentry->d_lock);
} else
spin_unlock(&d->d_lock);
node = dentry->d_subdirs.next;
}
spin_unlock(&dcache_lock);
spin_unlock(&dentry->d_lock);
}
/*
@@ -900,11 +906,16 @@ static void cgroup_clear_directory(struct dentry *dentry)
*/
static void cgroup_d_remove_dir(struct dentry *dentry)
{
struct dentry *parent;
cgroup_clear_directory(dentry);
spin_lock(&dcache_lock);
parent = dentry->d_parent;
spin_lock(&parent->d_lock);
spin_lock(&dentry->d_lock);
list_del_init(&dentry->d_u.d_child);
spin_unlock(&dcache_lock);
spin_unlock(&dentry->d_lock);
spin_unlock(&parent->d_lock);
remove_dir(dentry);
}
@@ -2180,7 +2191,7 @@ static const struct file_operations cgroup_file_operations = {
};
static const struct inode_operations cgroup_dir_inode_operations = {
.lookup = simple_lookup,
.lookup = cgroup_lookup,
.mkdir = cgroup_mkdir,
.rmdir = cgroup_rmdir,
.rename = cgroup_rename,
@@ -2196,13 +2207,29 @@ static inline struct cftype *__file_cft(struct file *file)
return __d_cft(file->f_dentry);
}
static int cgroup_create_file(struct dentry *dentry, mode_t mode,
struct super_block *sb)
static int cgroup_delete_dentry(const struct dentry *dentry)
{
static const struct dentry_operations cgroup_dops = {
return 1;
}
static struct dentry *cgroup_lookup(struct inode *dir,
struct dentry *dentry, struct nameidata *nd)
{
static const struct dentry_operations cgroup_dentry_operations = {
.d_delete = cgroup_delete_dentry,
.d_iput = cgroup_diput,
};
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
d_set_d_op(dentry, &cgroup_dentry_operations);
d_add(dentry, NULL);
return NULL;
}
static int cgroup_create_file(struct dentry *dentry, mode_t mode,
struct super_block *sb)
{
struct inode *inode;
if (!dentry)
@@ -2228,7 +2255,6 @@ static int cgroup_create_file(struct dentry *dentry, mode_t mode,
inode->i_size = 0;
inode->i_fop = &cgroup_file_operations;
}
dentry->d_op = &cgroup_dops;
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
return 0;
@@ -3638,9 +3664,7 @@ again:
list_del(&cgrp->sibling);
cgroup_unlock_hierarchy(cgrp->root);
spin_lock(&cgrp->dentry->d_lock);
d = dget(cgrp->dentry);
spin_unlock(&d->d_lock);
cgroup_d_remove_dir(d);
dput(d);