LCOV - code coverage report
Current view: top level - lkbce/fs/configfs - configfs_internal.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 39 39 100.0 %
Date: 2017-01-25 Functions: 6 6 100.0 %

          Line data    Source code
       1             : /* -*- mode: c; c-basic-offset:8; -*-
       2             :  * vim: noexpandtab sw=8 ts=8 sts=0:
       3             :  *
       4             :  * configfs_internal.h - Internal stuff for configfs
       5             :  *
       6             :  * This program is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2 of the License, or (at your option) any later version.
      10             :  *
      11             :  * This program is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU General Public
      17             :  * License along with this program; if not, write to the
      18             :  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
      19             :  * Boston, MA 021110-1307, USA.
      20             :  *
      21             :  * Based on sysfs:
      22             :  *      sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
      23             :  *
      24             :  * configfs Copyright (C) 2005 Oracle.  All rights reserved.
      25             :  */
      26             : 
      27             : #include <linux/slab.h>
      28             : #include <linux/list.h>
      29             : #include <linux/spinlock.h>
      30             : 
      31             : struct configfs_dirent {
      32             :         atomic_t                s_count;
      33             :         int                     s_dependent_count;
      34             :         struct list_head        s_sibling;
      35             :         struct list_head        s_children;
      36             :         struct list_head        s_links;
      37             :         void                    * s_element;
      38             :         int                     s_type;
      39             :         umode_t                 s_mode;
      40             :         struct dentry           * s_dentry;
      41             :         struct iattr            * s_iattr;
      42             : #ifdef CONFIG_LOCKDEP
      43             :         int                     s_depth;
      44             : #endif
      45             : };
      46             : 
      47             : #define CONFIGFS_ROOT           0x0001
      48             : #define CONFIGFS_DIR            0x0002
      49             : #define CONFIGFS_ITEM_ATTR      0x0004
      50             : #define CONFIGFS_ITEM_LINK      0x0020
      51             : #define CONFIGFS_USET_DIR       0x0040
      52             : #define CONFIGFS_USET_DEFAULT   0x0080
      53             : #define CONFIGFS_USET_DROPPING  0x0100
      54             : #define CONFIGFS_USET_IN_MKDIR  0x0200
      55             : #define CONFIGFS_USET_CREATING  0x0400
      56             : #define CONFIGFS_NOT_PINNED     (CONFIGFS_ITEM_ATTR)
      57             : 
      58           1 : extern struct mutex configfs_symlink_mutex;
      59           1 : extern spinlock_t configfs_dirent_lock;
      60             : 
      61           1 : extern struct vfsmount * configfs_mount;
      62           1 : extern struct kmem_cache *configfs_dir_cachep;
      63             : 
      64             : extern int configfs_is_root(struct config_item *item);
      65             : 
      66             : extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
      67             : extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
      68             : extern int configfs_inode_init(void);
      69             : extern void configfs_inode_exit(void);
      70             : 
      71             : extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
      72             : extern int configfs_make_dirent(struct configfs_dirent *,
      73             :                                 struct dentry *, void *, umode_t, int);
      74             : extern int configfs_dirent_is_ready(struct configfs_dirent *);
      75             : 
      76             : extern int configfs_add_file(struct dentry *, const struct configfs_attribute *, int);
      77             : extern void configfs_hash_and_remove(struct dentry * dir, const char * name);
      78             : 
      79             : extern const unsigned char * configfs_get_name(struct configfs_dirent *sd);
      80             : extern void configfs_drop_dentry(struct configfs_dirent *sd, struct dentry *parent);
      81             : extern int configfs_setattr(struct dentry *dentry, struct iattr *iattr);
      82             : 
      83             : extern int configfs_pin_fs(void);
      84             : extern void configfs_release_fs(void);
      85             : 
      86           1 : extern struct rw_semaphore configfs_rename_sem;
      87           1 : extern struct super_block * configfs_sb;
      88           1 : extern const struct file_operations configfs_dir_operations;
      89           1 : extern const struct file_operations configfs_file_operations;
      90             : extern const struct file_operations bin_fops;
      91           1 : extern const struct inode_operations configfs_dir_inode_operations;
      92           1 : extern const struct inode_operations configfs_symlink_inode_operations;
      93             : 
      94             : extern int configfs_symlink(struct inode *dir, struct dentry *dentry,
      95             :                             const char *symname);
      96             : extern int configfs_unlink(struct inode *dir, struct dentry *dentry);
      97           1 : 
      98             : struct configfs_symlink {
      99             :         struct list_head sl_list;
     100             :         struct config_item *sl_target;
     101             : };
     102             : 
     103             : extern int configfs_create_link(struct configfs_symlink *sl,
     104             :                                 struct dentry *parent,
     105             :                                 struct dentry *dentry);
     106             : 
     107             : static inline struct config_item * to_item(struct dentry * dentry)
     108             : {
     109           9 :         struct configfs_dirent * sd = dentry->d_fsdata;
     110           6 :         return ((struct config_item *) sd->s_element);
     111             : }
     112             : 
     113             : static inline struct configfs_attribute * to_attr(struct dentry * dentry)
     114             : {
     115          12 :         struct configfs_dirent * sd = dentry->d_fsdata;
     116           8 :         return ((struct configfs_attribute *) sd->s_element);
     117             : }
     118             : 
     119             : static inline struct config_item *configfs_get_config_item(struct dentry *dentry)
     120             : {
     121          18 :         struct config_item * item = NULL;
     122           9 : 
     123          27 :         spin_lock(&dcache_lock);
     124          45 :         if (!d_unhashed(dentry)) {
     125          18 :                 struct configfs_dirent * sd = dentry->d_fsdata;
     126          18 :                 if (sd->s_type & CONFIGFS_ITEM_LINK) {
     127          18 :                         struct configfs_symlink * sl = sd->s_element;
     128          18 :                         item = config_item_get(sl->sl_target);
     129             :                 } else
     130          27 :                         item = config_item_get(sd->s_element);
     131             :         }
     132          54 :         spin_unlock(&dcache_lock);
     133             : 
     134           9 :         return item;
     135             : }
     136             : 
     137             : static inline void release_configfs_dirent(struct configfs_dirent * sd)
     138             : {
     139          46 :         if (!(sd->s_type & CONFIGFS_ROOT)) {
     140          46 :                 kfree(sd->s_iattr);
     141          23 :                 kmem_cache_free(configfs_dir_cachep, sd);
     142             :         }
     143          23 : }
     144             : 
     145             : static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)
     146             : {
     147          24 :         if (sd) {
     148          88 :                 WARN_ON(!atomic_read(&sd->s_count));
     149          24 :                 atomic_inc(&sd->s_count);
     150             :         }
     151          16 :         return sd;
     152             : }
     153             : 
     154             : static inline void configfs_put(struct configfs_dirent * sd)
     155             : {
     156         242 :         WARN_ON(!atomic_read(&sd->s_count));
     157         110 :         if (atomic_dec_and_test(&sd->s_count))
     158          66 :                 release_configfs_dirent(sd);
     159          66 : }
     160           1 : 

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