Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 1 | /* |
| 2 | * fs/kernfs/kernfs-internal.h - kernfs internal header file |
| 3 | * |
| 4 | * Copyright (c) 2001-3 Patrick Mochel |
| 5 | * Copyright (c) 2007 SUSE Linux Products GmbH |
| 6 | * Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de> |
| 7 | * |
| 8 | * This file is released under the GPLv2. |
| 9 | */ |
| 10 | |
| 11 | #ifndef __KERNFS_INTERNAL_H |
| 12 | #define __KERNFS_INTERNAL_H |
| 13 | |
| 14 | #include <linux/lockdep.h> |
| 15 | #include <linux/fs.h> |
Tejun Heo | fd7b9f7 | 2013-11-28 14:54:33 -0500 | [diff] [blame] | 16 | #include <linux/mutex.h> |
Tejun Heo | 2322392 | 2013-11-23 17:40:02 -0500 | [diff] [blame] | 17 | #include <linux/xattr.h> |
Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 18 | |
| 19 | #include <linux/kernfs.h> |
| 20 | |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 21 | struct kernfs_iattrs { |
Tejun Heo | 9a8049a | 2013-11-23 17:40:01 -0500 | [diff] [blame] | 22 | struct iattr ia_iattr; |
| 23 | void *ia_secdata; |
| 24 | u32 ia_secdata_len; |
Tejun Heo | 2322392 | 2013-11-23 17:40:02 -0500 | [diff] [blame] | 25 | |
| 26 | struct simple_xattrs xattrs; |
Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 27 | }; |
| 28 | |
Tejun Heo | 81c173c | 2014-02-03 14:03:00 -0500 | [diff] [blame] | 29 | /* +1 to avoid triggering overflow warning when negating it */ |
| 30 | #define KN_DEACTIVATED_BIAS (INT_MIN + 1) |
Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 31 | |
Tejun Heo | df23fc3 | 2013-12-11 14:11:56 -0500 | [diff] [blame] | 32 | /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */ |
Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 33 | |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 34 | /** |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 35 | * kernfs_root - find out the kernfs_root a kernfs_node belongs to |
| 36 | * @kn: kernfs_node of interest |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 37 | * |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 38 | * Return the kernfs_root @kn belongs to. |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 39 | */ |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 40 | static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn) |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 41 | { |
| 42 | /* if parent exists, it's always a dir; otherwise, @sd is a dir */ |
Tejun Heo | adc5e8b | 2013-12-11 14:11:54 -0500 | [diff] [blame] | 43 | if (kn->parent) |
| 44 | kn = kn->parent; |
| 45 | return kn->dir.root; |
Tejun Heo | ba7443b | 2013-11-28 14:54:40 -0500 | [diff] [blame] | 46 | } |
| 47 | |
Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 48 | /* |
Tejun Heo | fa736a9 | 2013-11-28 14:54:44 -0500 | [diff] [blame] | 49 | * mount.c |
| 50 | */ |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 51 | struct kernfs_super_info { |
Tejun Heo | 7d568a8 | 2014-04-09 11:07:30 -0400 | [diff] [blame] | 52 | struct super_block *sb; |
| 53 | |
Tejun Heo | fa736a9 | 2013-11-28 14:54:44 -0500 | [diff] [blame] | 54 | /* |
| 55 | * The root associated with this super_block. Each super_block is |
| 56 | * identified by the root and ns it's associated with. |
| 57 | */ |
| 58 | struct kernfs_root *root; |
| 59 | |
| 60 | /* |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 61 | * Each sb is associated with one namespace tag, currently the |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 62 | * network namespace of the task which mounted this kernfs |
| 63 | * instance. If multiple tags become necessary, make the following |
| 64 | * an array and compare kernfs_node tag against every entry. |
Tejun Heo | fa736a9 | 2013-11-28 14:54:44 -0500 | [diff] [blame] | 65 | */ |
| 66 | const void *ns; |
Tejun Heo | 7d568a8 | 2014-04-09 11:07:30 -0400 | [diff] [blame] | 67 | |
| 68 | /* anchored at kernfs_root->supers, protected by kernfs_mutex */ |
| 69 | struct list_head node; |
Tejun Heo | fa736a9 | 2013-11-28 14:54:44 -0500 | [diff] [blame] | 70 | }; |
Tejun Heo | c525aad | 2013-12-11 14:11:55 -0500 | [diff] [blame] | 71 | #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) |
Tejun Heo | fa736a9 | 2013-11-28 14:54:44 -0500 | [diff] [blame] | 72 | |
Li Zefan | f41c593 | 2014-02-14 16:57:27 +0800 | [diff] [blame] | 73 | extern const struct super_operations kernfs_sops; |
Tejun Heo | a797bfc | 2013-12-11 14:11:57 -0500 | [diff] [blame] | 74 | extern struct kmem_cache *kernfs_node_cache; |
Tejun Heo | fa736a9 | 2013-11-28 14:54:44 -0500 | [diff] [blame] | 75 | |
| 76 | /* |
Tejun Heo | ffed24e | 2013-11-28 14:54:32 -0500 | [diff] [blame] | 77 | * inode.c |
| 78 | */ |
Tejun Heo | c637b8a | 2013-12-11 14:11:58 -0500 | [diff] [blame] | 79 | void kernfs_evict_inode(struct inode *inode); |
| 80 | int kernfs_iop_permission(struct inode *inode, int mask); |
| 81 | int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr); |
| 82 | int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 83 | struct kstat *stat); |
Al Viro | 3767e25 | 2016-05-27 11:06:05 -0400 | [diff] [blame] | 84 | int kernfs_iop_setxattr(struct dentry *dentry, struct inode *inode, |
| 85 | const char *name, const void *value, |
Tejun Heo | c637b8a | 2013-12-11 14:11:58 -0500 | [diff] [blame] | 86 | size_t size, int flags); |
| 87 | int kernfs_iop_removexattr(struct dentry *dentry, const char *name); |
Al Viro | ce23e64 | 2016-04-11 00:48:00 -0400 | [diff] [blame] | 88 | ssize_t kernfs_iop_getxattr(struct dentry *dentry, struct inode *inode, |
| 89 | const char *name, void *buf, size_t size); |
Tejun Heo | c637b8a | 2013-12-11 14:11:58 -0500 | [diff] [blame] | 90 | ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); |
Tejun Heo | ffed24e | 2013-11-28 14:54:32 -0500 | [diff] [blame] | 91 | |
Tejun Heo | fd7b9f7 | 2013-11-28 14:54:33 -0500 | [diff] [blame] | 92 | /* |
| 93 | * dir.c |
| 94 | */ |
Tejun Heo | a797bfc | 2013-12-11 14:11:57 -0500 | [diff] [blame] | 95 | extern struct mutex kernfs_mutex; |
| 96 | extern const struct dentry_operations kernfs_dops; |
| 97 | extern const struct file_operations kernfs_dir_fops; |
| 98 | extern const struct inode_operations kernfs_dir_iops; |
Tejun Heo | fd7b9f7 | 2013-11-28 14:54:33 -0500 | [diff] [blame] | 99 | |
Tejun Heo | c637b8a | 2013-12-11 14:11:58 -0500 | [diff] [blame] | 100 | struct kernfs_node *kernfs_get_active(struct kernfs_node *kn); |
| 101 | void kernfs_put_active(struct kernfs_node *kn); |
Tejun Heo | 988cd7a | 2014-02-03 14:02:58 -0500 | [diff] [blame] | 102 | int kernfs_add_one(struct kernfs_node *kn); |
Tejun Heo | db4aad2 | 2014-01-17 09:58:25 -0500 | [diff] [blame] | 103 | struct kernfs_node *kernfs_new_node(struct kernfs_node *parent, |
| 104 | const char *name, umode_t mode, |
| 105 | unsigned flags); |
Tejun Heo | fd7b9f7 | 2013-11-28 14:54:33 -0500 | [diff] [blame] | 106 | |
Tejun Heo | 414985a | 2013-11-28 14:54:34 -0500 | [diff] [blame] | 107 | /* |
| 108 | * file.c |
| 109 | */ |
Tejun Heo | a797bfc | 2013-12-11 14:11:57 -0500 | [diff] [blame] | 110 | extern const struct file_operations kernfs_file_fops; |
Tejun Heo | 414985a | 2013-11-28 14:54:34 -0500 | [diff] [blame] | 111 | |
Greg Kroah-Hartman | 55f6e30 | 2014-01-13 14:27:16 -0800 | [diff] [blame] | 112 | void kernfs_unmap_bin_file(struct kernfs_node *kn); |
Tejun Heo | 414985a | 2013-11-28 14:54:34 -0500 | [diff] [blame] | 113 | |
Tejun Heo | 2072f1a | 2013-11-28 14:54:35 -0500 | [diff] [blame] | 114 | /* |
| 115 | * symlink.c |
| 116 | */ |
Tejun Heo | a797bfc | 2013-12-11 14:11:57 -0500 | [diff] [blame] | 117 | extern const struct inode_operations kernfs_symlink_iops; |
Tejun Heo | 2072f1a | 2013-11-28 14:54:35 -0500 | [diff] [blame] | 118 | |
Tejun Heo | ae6621b | 2013-11-28 14:54:31 -0500 | [diff] [blame] | 119 | #endif /* __KERNFS_INTERNAL_H */ |