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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  sysfs: allow creating symlinks from untagged to tagged directories
  sysfs: sysfs_delete_link handle symlinks from untagged to tagged directories.
  sysfs: Don't allow the creation of symlinks we can't remove
This commit is contained in:
Linus Torvalds 2010-07-26 13:07:25 -07:00
parent 592d32cc41 d33002129e
commit e9d67a7854
1 changed files with 20 additions and 6 deletions
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26
fs/sysfs/symlink.c
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@ -28,6 +28,7 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
struct sysfs_dirent *target_sd = NULL;
struct sysfs_dirent *sd = NULL;
struct sysfs_addrm_cxt acxt;
enum kobj_ns_type ns_type;
int error;
BUG_ON(!name);
@ -58,16 +59,29 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
if (!sd)
goto out_put;
if (sysfs_ns_type(parent_sd))
ns_type = sysfs_ns_type(parent_sd);
if (ns_type)
sd->s_ns = target->ktype->namespace(target);
sd->s_symlink.target_sd = target_sd;
target_sd = NULL; /* reference is now owned by the symlink */
sysfs_addrm_start(&acxt, parent_sd);
if (warn)
error = sysfs_add_one(&acxt, sd);
else
error = __sysfs_add_one(&acxt, sd);
/* Symlinks must be between directories with the same ns_type */
if (!ns_type ||
(ns_type == sysfs_ns_type(sd->s_symlink.target_sd->s_parent))) {
if (warn)
error = sysfs_add_one(&acxt, sd);
else
error = __sysfs_add_one(&acxt, sd);
} else {
error = -EINVAL;
WARN(1, KERN_WARNING
"sysfs: symlink across ns_types %s/%s -> %s/%s\n",
parent_sd->s_name,
sd->s_name,
sd->s_symlink.target_sd->s_parent->s_name,
sd->s_symlink.target_sd->s_name);
}
sysfs_addrm_finish(&acxt);
if (error)
@ -122,7 +136,7 @@ void sysfs_delete_link(struct kobject *kobj, struct kobject *targ,
{
const void *ns = NULL;
spin_lock(&sysfs_assoc_lock);
if (targ->sd)
if (targ->sd && sysfs_ns_type(kobj->sd))
ns = targ->sd->s_ns;
spin_unlock(&sysfs_assoc_lock);
sysfs_hash_and_remove(kobj->sd, ns, name);