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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

Browse source 
Pull SCSI target updates from Nicholas Bellinger:
 "The highlights this round include:

   - Introduce configfs support for unlocked configfs_depend_item()
     (krzysztof + andrezej)
   - Conversion of usb-gadget target driver to new function registration
     interface (andrzej + sebastian)
   - Enable qla2xxx FC target mode support for Extended Logins (himansu +
     giridhar)
   - Enable qla2xxx FC target mode support for Exchange Offload (himansu +
     giridhar)
   - Add qla2xxx FC target mode irq affinity notification + selective
     command queuing.  (quinn + himanshu)
   - Fix iscsi-target deadlock in se_node_acl configfs deletion (sagi +
     nab)
   - Convert se_node_acl configfs deletion + se_node_acl->queue_depth to
     proper se_session->sess_kref + target_get_session() usage.  (hch +
     sagi + nab)
   - Fix long-standing race between se_node_acl->acl_kref get and
     get_initiator_node_acl() lookup.  (hch + nab)
   - Fix target/user block-size handling, and make sure netlink reaches
     all network namespaces (sheng + andy)

  Note there is an outstanding bug-fix series for remote I_T nexus port
  TMR LUN_RESET has been posted and still being tested, and will likely
  become post -rc1 material at this point"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (56 commits)
  scsi: qla2xxxx: avoid type mismatch in comparison
  target/user: Make sure netlink would reach all network namespaces
  target: Obtain se_node_acl->acl_kref during get_initiator_node_acl
  target: Convert ACL change queue_depth se_session reference usage
  iscsi-target: Fix potential dead-lock during node acl delete
  ib_srpt: Convert acl lookup to modern get_initiator_node_acl usage
  tcm_fc: Convert acl lookup to modern get_initiator_node_acl usage
  tcm_fc: Wait for command completion before freeing a session
  target: Fix a memory leak in target_dev_lba_map_store()
  target: Support aborting tasks with a 64-bit tag
  usb/gadget: Remove set-but-not-used variables
  target: Remove an unused variable
  target: Fix indentation in target_core_configfs.c
  target/user: Allow user to set block size before enabling device
  iser-target: Fix non negative ERR_PTR isert_device_get usage
  target/fcoe: Add tag support to tcm_fc
  qla2xxx: Check for online flag instead of active reset when transmitting responses
  qla2xxx: Set all queues to 4k
  qla2xxx: Disable ZIO at start time.
  qla2xxx: Move atioq to a different lock to reduce lock contention
  ...
This commit is contained in:
Linus Torvalds 2016-01-20 17:20:53 -08:00
commit 71e4634e00
53 changed files with 4507 additions and 2699 deletions
Download patch file Download diff file Expand all files Collapse all files

150
fs/configfs/dir.c
View file

@ -1070,11 +1070,55 @@ out:
return ret;
}
static int configfs_do_depend_item(struct dentry *subsys_dentry,
struct config_item *target)
{
struct configfs_dirent *p;
int ret;
spin_lock(&configfs_dirent_lock);
/* Scan the tree, return 0 if found */
ret = configfs_depend_prep(subsys_dentry, target);
if (ret)
goto out_unlock_dirent_lock;
/*
* We are sure that the item is not about to be removed by rmdir(), and
* not in the middle of attachment by mkdir().
*/
p = target->ci_dentry->d_fsdata;
p->s_dependent_count += 1;
out_unlock_dirent_lock:
spin_unlock(&configfs_dirent_lock);
return ret;
}
static inline struct configfs_dirent *
configfs_find_subsys_dentry(struct configfs_dirent *root_sd,
struct config_item *subsys_item)
{
struct configfs_dirent *p;
struct configfs_dirent *ret = NULL;
list_for_each_entry(p, &root_sd->s_children, s_sibling) {
if (p->s_type & CONFIGFS_DIR &&
p->s_element == subsys_item) {
ret = p;
break;
}
}
return ret;
}
int configfs_depend_item(struct configfs_subsystem *subsys,
struct config_item *target)
{
int ret;
struct configfs_dirent *p, *root_sd, *subsys_sd = NULL;
struct configfs_dirent *subsys_sd;
struct config_item *s_item = &subsys->su_group.cg_item;
struct dentry *root;
@ -1093,39 +1137,15 @@ int configfs_depend_item(struct configfs_subsystem *subsys,
*/
mutex_lock(&d_inode(root)->i_mutex);
root_sd = root->d_fsdata;
list_for_each_entry(p, &root_sd->s_children, s_sibling) {
if (p->s_type & CONFIGFS_DIR) {
if (p->s_element == s_item) {
subsys_sd = p;
break;
}
}
}
subsys_sd = configfs_find_subsys_dentry(root->d_fsdata, s_item);
if (!subsys_sd) {
ret = -ENOENT;
goto out_unlock_fs;
}
/* Ok, now we can trust subsys/s_item */
ret = configfs_do_depend_item(subsys_sd->s_dentry, target);
spin_lock(&configfs_dirent_lock);
/* Scan the tree, return 0 if found */
ret = configfs_depend_prep(subsys_sd->s_dentry, target);
if (ret)
goto out_unlock_dirent_lock;
/*
* We are sure that the item is not about to be removed by rmdir(), and
* not in the middle of attachment by mkdir().
*/
p = target->ci_dentry->d_fsdata;
p->s_dependent_count += 1;
out_unlock_dirent_lock:
spin_unlock(&configfs_dirent_lock);
out_unlock_fs:
mutex_unlock(&d_inode(root)->i_mutex);
@ -1144,8 +1164,7 @@ EXPORT_SYMBOL(configfs_depend_item);
* configfs_depend_item() because we know that that the client driver is
* pinned, thus the subsystem is pinned, and therefore configfs is pinned.
*/
void configfs_undepend_item(struct configfs_subsystem *subsys,
struct config_item *target)
void configfs_undepend_item(struct config_item *target)
{
struct configfs_dirent *sd;
@ -1168,6 +1187,79 @@ void configfs_undepend_item(struct configfs_subsystem *subsys,
}
EXPORT_SYMBOL(configfs_undepend_item);
/*
* caller_subsys is a caller's subsystem not target's. This is used to
* determine if we should lock root and check subsys or not. When we are
* in the same subsystem as our target there is no need to do locking as
* we know that subsys is valid and is not unregistered during this function
* as we are called from callback of one of his children and VFS holds a lock
* on some inode. Otherwise we have to lock our root to ensure that target's
* subsystem it is not unregistered during this function.
*/
int configfs_depend_item_unlocked(struct configfs_subsystem *caller_subsys,
struct config_item *target)
{
struct configfs_subsystem *target_subsys;
struct config_group *root, *parent;
struct configfs_dirent *subsys_sd;
int ret = -ENOENT;
/* Disallow this function for configfs root */
if (configfs_is_root(target))
return -EINVAL;
parent = target->ci_group;
/*
* This may happen when someone is trying to depend root
* directory of some subsystem
*/
if (configfs_is_root(&parent->cg_item)) {
target_subsys = to_configfs_subsystem(to_config_group(target));
root = parent;
} else {
target_subsys = parent->cg_subsys;
/* Find a cofnigfs root as we may need it for locking */
for (root = parent; !configfs_is_root(&root->cg_item);
root = root->cg_item.ci_group)
;
}
if (target_subsys != caller_subsys) {
/*
* We are in other configfs subsystem, so we have to do
* additional locking to prevent other subsystem from being
* unregistered
*/
mutex_lock(&d_inode(root->cg_item.ci_dentry)->i_mutex);
/*
* As we are trying to depend item from other subsystem
* we have to check if this subsystem is still registered
*/
subsys_sd = configfs_find_subsys_dentry(
root->cg_item.ci_dentry->d_fsdata,
&target_subsys->su_group.cg_item);
if (!subsys_sd)
goto out_root_unlock;
} else {
subsys_sd = target_subsys->su_group.cg_item.ci_dentry->d_fsdata;
}
/* Now we can execute core of depend item */
ret = configfs_do_depend_item(subsys_sd->s_dentry, target);
if (target_subsys != caller_subsys)
out_root_unlock:
/*
* We were called from subsystem other than our target so we
* took some locks so now it's time to release them
*/
mutex_unlock(&d_inode(root->cg_item.ci_dentry)->i_mutex);
return ret;
}
EXPORT_SYMBOL(configfs_depend_item_unlocked);
static int configfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
int ret = 0;