fs/tracefs/internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _TRACEFS_INTERNAL_H
   3 #define _TRACEFS_INTERNAL_H
   4
   5 enum {
   6         TRACEFS_EVENT_INODE             = BIT(1),
   7         TRACEFS_EVENT_TOP_INODE         = BIT(2),
   8         TRACEFS_GID_PERM_SET            = BIT(3),
   9         TRACEFS_UID_PERM_SET            = BIT(4),
  10         TRACEFS_INSTANCE_INODE          = BIT(5),
  11 };
  12
  13 struct tracefs_inode {
  14         struct inode            vfs_inode;
  15         /* The below gets initialized with memset_after(ti, 0, vfs_inode) */
  16         unsigned long           flags;
  17         void                    *private;
  18 };
  19
  20 /*
  21  * struct eventfs_attr - cache the mode and ownership of a eventfs entry
  22  * @mode:       saved mode plus flags of what is saved
  23  * @uid:        saved uid if changed
  24  * @gid:        saved gid if changed
  25  */
  26 struct eventfs_attr {
  27         int                             mode;
  28         kuid_t                          uid;
  29         kgid_t                          gid;
  30 };
  31
  32 /*
  33  * struct eventfs_inode - hold the properties of the eventfs directories.
  34  * @list:       link list into the parent directory
  35  * @rcu:        Union with @list for freeing
  36  * @children:   link list into the child eventfs_inode
  37  * @entries:    the array of entries representing the files in the directory
  38  * @name:       the name of the directory to create
  39  * @entry_attrs: Saved mode and ownership of the @d_children
  40  * @data:       The private data to pass to the callbacks
  41  * @attr:       Saved mode and ownership of eventfs_inode itself
  42  * @is_freed:   Flag set if the eventfs is on its way to be freed
  43  *                Note if is_freed is set, then dentry is corrupted.
  44  * @is_events:  Flag set for only the top level "events" directory
  45  * @nr_entries: The number of items in @entries
  46  * @ino:        The saved inode number
  47  */
  48 struct eventfs_inode {
  49         union {
  50                 struct list_head        list;
  51                 struct rcu_head         rcu;
  52         };
  53         struct list_head                children;
  54         const struct eventfs_entry      *entries;
  55         const char                      *name;
  56         struct eventfs_attr             *entry_attrs;
  57         void                            *data;
  58         struct eventfs_attr             attr;
  59         struct kref                     kref;
  60         unsigned int                    is_freed:1;
  61         unsigned int                    is_events:1;
  62         unsigned int                    nr_entries:30;
  63         unsigned int                    ino;
  64 };
  65
  66 static inline struct tracefs_inode *get_tracefs(const struct inode *inode)
  67 {
  68         return container_of(inode, struct tracefs_inode, vfs_inode);
  69 }
  70
  71 struct dentry *tracefs_start_creating(const char *name, struct dentry *parent);
  72 struct dentry *tracefs_end_creating(struct dentry *dentry);
  73 struct dentry *tracefs_failed_creating(struct dentry *dentry);
  74 struct inode *tracefs_get_inode(struct super_block *sb);
  75
  76 void eventfs_d_release(struct dentry *dentry);
  77
  78 #endif /* _TRACEFS_INTERNAL_H */