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include/linux/kernfs.h
14.6 KB
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/* * kernfs.h - pseudo filesystem decoupled from vfs locking * * This file is released under the GPLv2. */ #ifndef __LINUX_KERNFS_H #define __LINUX_KERNFS_H |
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#include <linux/kernel.h> |
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#include <linux/err.h> |
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#include <linux/list.h> #include <linux/mutex.h> |
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#include <linux/idr.h> |
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#include <linux/lockdep.h> |
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#include <linux/rbtree.h> #include <linux/atomic.h> |
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#include <linux/wait.h> |
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struct file; |
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struct dentry; |
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struct iattr; |
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struct seq_file; struct vm_area_struct; |
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struct super_block; struct file_system_type; |
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struct kernfs_open_node; struct kernfs_iattrs; |
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enum kernfs_node_type { |
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KERNFS_DIR = 0x0001, KERNFS_FILE = 0x0002, KERNFS_LINK = 0x0004, |
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}; |
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#define KERNFS_TYPE_MASK 0x000f |
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#define KERNFS_FLAG_MASK ~KERNFS_TYPE_MASK |
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enum kernfs_node_flag { |
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KERNFS_ACTIVATED = 0x0010, |
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KERNFS_NS = 0x0020, KERNFS_HAS_SEQ_SHOW = 0x0040, KERNFS_HAS_MMAP = 0x0080, KERNFS_LOCKDEP = 0x0100, |
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KERNFS_SUICIDAL = 0x0400, KERNFS_SUICIDED = 0x0800, |
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KERNFS_EMPTY_DIR = 0x1000, |
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}; |
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/* @flags for kernfs_create_root() */ enum kernfs_root_flag { |
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/* * kernfs_nodes are created in the deactivated state and invisible. * They require explicit kernfs_activate() to become visible. This * can be used to make related nodes become visible atomically * after all nodes are created successfully. */ KERNFS_ROOT_CREATE_DEACTIVATED = 0x0001, /* * For regular flies, if the opener has CAP_DAC_OVERRIDE, open(2) * succeeds regardless of the RW permissions. sysfs had an extra * layer of enforcement where open(2) fails with -EACCES regardless * of CAP_DAC_OVERRIDE if the permission doesn't have the * respective read or write access at all (none of S_IRUGO or * S_IWUGO) or the respective operation isn't implemented. The * following flag enables that behavior. */ KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK = 0x0002, |
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}; |
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/* type-specific structures for kernfs_node union members */ struct kernfs_elem_dir { |
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unsigned long subdirs; |
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/* children rbtree starts here and goes through kn->rb */ |
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struct rb_root children; /* * The kernfs hierarchy this directory belongs to. This fits |
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* better directly in kernfs_node but is here to save space. |
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*/ struct kernfs_root *root; }; |
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struct kernfs_elem_symlink { struct kernfs_node *target_kn; |
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}; |
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struct kernfs_elem_attr { |
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const struct kernfs_ops *ops; |
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struct kernfs_open_node *open; |
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loff_t size; |
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struct kernfs_node *notify_next; /* for kernfs_notify() */ |
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}; /* |
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* kernfs_node - the building block of kernfs hierarchy. Each and every * kernfs node is represented by single kernfs_node. Most fields are |
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* private to kernfs and shouldn't be accessed directly by kernfs users. * |
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* As long as s_count reference is held, the kernfs_node itself is * accessible. Dereferencing elem or any other outer entity requires * active reference. |
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*/ |
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struct kernfs_node { |
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atomic_t count; atomic_t active; |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif |
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/* * Use kernfs_get_parent() and kernfs_name/path() instead of * accessing the following two fields directly. If the node is * never moved to a different parent, it is safe to access the * parent directly. */ |
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struct kernfs_node *parent; const char *name; |
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struct rb_node rb; |
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const void *ns; /* namespace tag */ |
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unsigned int hash; /* ns + name hash */ |
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union { |
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struct kernfs_elem_dir dir; struct kernfs_elem_symlink symlink; struct kernfs_elem_attr attr; |
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}; void *priv; |
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unsigned short flags; umode_t mode; unsigned int ino; |
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struct kernfs_iattrs *iattr; |
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}; |
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/* |
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* kernfs_syscall_ops may be specified on kernfs_create_root() to support * syscalls. These optional callbacks are invoked on the matching syscalls * and can perform any kernfs operations which don't necessarily have to be * the exact operation requested. An active reference is held for each * kernfs_node parameter. |
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*/ |
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struct kernfs_syscall_ops { |
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int (*remount_fs)(struct kernfs_root *root, int *flags, char *data); int (*show_options)(struct seq_file *sf, struct kernfs_root *root); |
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int (*mkdir)(struct kernfs_node *parent, const char *name, umode_t mode); int (*rmdir)(struct kernfs_node *kn); int (*rename)(struct kernfs_node *kn, struct kernfs_node *new_parent, const char *new_name); }; |
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struct kernfs_root { /* published fields */ |
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struct kernfs_node *kn; |
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unsigned int flags; /* KERNFS_ROOT_* flags */ |
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/* private fields, do not use outside kernfs proper */ struct ida ino_ida; |
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struct kernfs_syscall_ops *syscall_ops; |
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/* list of kernfs_super_info of this root, protected by kernfs_mutex */ struct list_head supers; |
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wait_queue_head_t deactivate_waitq; |
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}; |
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struct kernfs_open_file { |
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/* published fields */ |
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struct kernfs_node *kn; |
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struct file *file; |
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void *priv; |
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/* private fields, do not use outside kernfs proper */ struct mutex mutex; int event; struct list_head list; |
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char *prealloc_buf; |
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size_t atomic_write_len; |
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bool mmapped; const struct vm_operations_struct *vm_ops; }; |
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struct kernfs_ops { /* * Read is handled by either seq_file or raw_read(). * |
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* If seq_show() is present, seq_file path is active. Other seq * operations are optional and if not implemented, the behavior is * equivalent to single_open(). @sf->private points to the |
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* associated kernfs_open_file. |
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* * read() is bounced through kernel buffer and a read larger than * PAGE_SIZE results in partial operation of PAGE_SIZE. */ int (*seq_show)(struct seq_file *sf, void *v); |
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void *(*seq_start)(struct seq_file *sf, loff_t *ppos); void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos); void (*seq_stop)(struct seq_file *sf, void *v); |
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ssize_t (*read)(struct kernfs_open_file *of, char *buf, size_t bytes, |
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loff_t off); /* |
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* write() is bounced through kernel buffer. If atomic_write_len * is not set, a write larger than PAGE_SIZE results in partial * operations of PAGE_SIZE chunks. If atomic_write_len is set, * writes upto the specified size are executed atomically but * larger ones are rejected with -E2BIG. |
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*/ |
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size_t atomic_write_len; |
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/* * "prealloc" causes a buffer to be allocated at open for * all read/write requests. As ->seq_show uses seq_read() * which does its own allocation, it is incompatible with * ->prealloc. Provide ->read and ->write with ->prealloc. */ bool prealloc; |
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ssize_t (*write)(struct kernfs_open_file *of, char *buf, size_t bytes, |
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loff_t off); |
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int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma); |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC struct lock_class_key lockdep_key; #endif |
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}; |
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#ifdef CONFIG_KERNFS |
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static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn) |
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{ |
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return kn->flags & KERNFS_TYPE_MASK; |
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} /** * kernfs_enable_ns - enable namespace under a directory |
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* @kn: directory of interest, should be empty |
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* |
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* This is to be called right after @kn is created to enable namespace * under it. All children of @kn must have non-NULL namespace tags and |
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* only the ones which match the super_block's tag will be visible. */ |
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static inline void kernfs_enable_ns(struct kernfs_node *kn) |
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{ |
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WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR); |
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WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children)); |
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kn->flags |= KERNFS_NS; |
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} |
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/** * kernfs_ns_enabled - test whether namespace is enabled |
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* @kn: the node to test |
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* * Test whether namespace filtering is enabled for the children of @ns. */ |
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static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
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{ |
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return kn->flags & KERNFS_NS; |
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} |
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int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen); |
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size_t kernfs_path_len(struct kernfs_node *kn); |
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char * __must_check kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen); void pr_cont_kernfs_name(struct kernfs_node *kn); void pr_cont_kernfs_path(struct kernfs_node *kn); struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn); |
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struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name, const void *ns); void kernfs_get(struct kernfs_node *kn); void kernfs_put(struct kernfs_node *kn); |
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struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry); struct kernfs_root *kernfs_root_from_sb(struct super_block *sb); |
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struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn); |
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struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops, |
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unsigned int flags, void *priv); |
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void kernfs_destroy_root(struct kernfs_root *root); |
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struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent, |
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const char *name, umode_t mode, void *priv, const void *ns); |
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struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent, const char *name); |
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struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode, loff_t size, const struct kernfs_ops *ops, void *priv, const void *ns, |
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struct lock_class_key *key); |
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struct kernfs_node *kernfs_create_link(struct kernfs_node *parent, const char *name, struct kernfs_node *target); |
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void kernfs_activate(struct kernfs_node *kn); |
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void kernfs_remove(struct kernfs_node *kn); |
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void kernfs_break_active_protection(struct kernfs_node *kn); void kernfs_unbreak_active_protection(struct kernfs_node *kn); bool kernfs_remove_self(struct kernfs_node *kn); |
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int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name, |
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const void *ns); |
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int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent, |
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const char *new_name, const void *new_ns); |
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int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); void kernfs_notify(struct kernfs_node *kn); |
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const void *kernfs_super_ns(struct super_block *sb); struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, |
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struct kernfs_root *root, unsigned long magic, bool *new_sb_created, const void *ns); |
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void kernfs_kill_sb(struct super_block *sb); |
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struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns); |
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void kernfs_init(void); |
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#else /* CONFIG_KERNFS */ |
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static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn) |
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{ return 0; } /* whatever */ |
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static inline void kernfs_enable_ns(struct kernfs_node *kn) { } |
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static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
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{ return false; } |
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static inline int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen) { return -ENOSYS; } |
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static inline size_t kernfs_path_len(struct kernfs_node *kn) { return 0; } |
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static inline char * __must_check kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen) { return NULL; } static inline void pr_cont_kernfs_name(struct kernfs_node *kn) { } static inline void pr_cont_kernfs_path(struct kernfs_node *kn) { } static inline struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn) { return NULL; } |
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static inline struct kernfs_node * kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name, |
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const void *ns) { return NULL; } |
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static inline void kernfs_get(struct kernfs_node *kn) { } static inline void kernfs_put(struct kernfs_node *kn) { } |
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static inline struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry) { return NULL; } static inline struct kernfs_root *kernfs_root_from_sb(struct super_block *sb) { return NULL; } |
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static inline struct inode * kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn) { return NULL; } |
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static inline struct kernfs_root * |
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kernfs_create_root(struct kernfs_syscall_ops *scops, unsigned int flags, void *priv) |
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{ return ERR_PTR(-ENOSYS); } static inline void kernfs_destroy_root(struct kernfs_root *root) { } |
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static inline struct kernfs_node * |
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kernfs_create_dir_ns(struct kernfs_node *parent, const char *name, umode_t mode, void *priv, const void *ns) |
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{ return ERR_PTR(-ENOSYS); } |
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static inline struct kernfs_node * |
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__kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode, loff_t size, const struct kernfs_ops *ops, |
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void *priv, const void *ns, struct lock_class_key *key) |
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{ return ERR_PTR(-ENOSYS); } |
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static inline struct kernfs_node * kernfs_create_link(struct kernfs_node *parent, const char *name, struct kernfs_node *target) |
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{ return ERR_PTR(-ENOSYS); } |
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static inline void kernfs_activate(struct kernfs_node *kn) { } |
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static inline void kernfs_remove(struct kernfs_node *kn) { } |
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static inline bool kernfs_remove_self(struct kernfs_node *kn) { return false; } |
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static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn, |
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const char *name, const void *ns) { return -ENOSYS; } |
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static inline int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent, |
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const char *new_name, const void *new_ns) { return -ENOSYS; } |
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static inline int kernfs_setattr(struct kernfs_node *kn, |
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const struct iattr *iattr) { return -ENOSYS; } |
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static inline void kernfs_notify(struct kernfs_node *kn) { } |
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static inline const void *kernfs_super_ns(struct super_block *sb) { return NULL; } static inline struct dentry * kernfs_mount_ns(struct file_system_type *fs_type, int flags, |
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struct kernfs_root *root, unsigned long magic, bool *new_sb_created, const void *ns) |
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{ return ERR_PTR(-ENOSYS); } static inline void kernfs_kill_sb(struct super_block *sb) { } static inline void kernfs_init(void) { } |
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#endif /* CONFIG_KERNFS */ |
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static inline struct kernfs_node * kernfs_find_and_get(struct kernfs_node *kn, const char *name) |
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{ |
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return kernfs_find_and_get_ns(kn, name, NULL); |
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} |
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static inline struct kernfs_node * |
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kernfs_create_dir(struct kernfs_node *parent, const char *name, umode_t mode, void *priv) |
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{ |
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return kernfs_create_dir_ns(parent, name, mode, priv, NULL); |
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} |
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static inline struct kernfs_node * kernfs_create_file_ns(struct kernfs_node *parent, const char *name, |
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umode_t mode, loff_t size, const struct kernfs_ops *ops, void *priv, const void *ns) { struct lock_class_key *key = NULL; #ifdef CONFIG_DEBUG_LOCK_ALLOC key = (struct lock_class_key *)&ops->lockdep_key; #endif |
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return __kernfs_create_file(parent, name, mode, size, ops, priv, ns, |
dfeb0750b
|
413 |
key); |
517e64f57
|
414 |
} |
324a56e16
|
415 416 |
static inline struct kernfs_node * kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode, |
496f73944
|
417 418 419 420 |
loff_t size, const struct kernfs_ops *ops, void *priv) { return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL); } |
324a56e16
|
421 |
static inline int kernfs_remove_by_name(struct kernfs_node *parent, |
879f40d19
|
422 423 424 425 |
const char *name) { return kernfs_remove_by_name_ns(parent, name, NULL); } |
0c23b2259
|
426 427 428 429 430 431 |
static inline int kernfs_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, const char *new_name) { return kernfs_rename_ns(kn, new_parent, new_name, NULL); } |
4b93dc9b1
|
432 433 |
static inline struct dentry * kernfs_mount(struct file_system_type *fs_type, int flags, |
26fc9cd20
|
434 435 |
struct kernfs_root *root, unsigned long magic, bool *new_sb_created) |
4b93dc9b1
|
436 |
{ |
26fc9cd20
|
437 438 |
return kernfs_mount_ns(fs_type, flags, root, magic, new_sb_created, NULL); |
4b93dc9b1
|
439 |
} |
b8441ed27
|
440 |
#endif /* __LINUX_KERNFS_H */ |