From f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 01:04:47 +0000
Subject: [PATCH] add driver 5G
---
kernel/include/linux/fsnotify.h | 290 ++++++++++++++++++++++++++++++++++-----------------------
1 files changed, 172 insertions(+), 118 deletions(-)
diff --git a/kernel/include/linux/fsnotify.h b/kernel/include/linux/fsnotify.h
index f3eb2b2..79add91 100644
--- a/kernel/include/linux/fsnotify.h
+++ b/kernel/include/linux/fsnotify.h
@@ -17,39 +17,102 @@
#include <linux/slab.h>
#include <linux/bug.h>
-/* Notify this dentry's parent about a child's events. */
-static inline int fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask)
+/*
+ * Notify this @dir inode about a change in a child directory entry.
+ * The directory entry may have turned positive or negative or its inode may
+ * have changed (i.e. renamed over).
+ *
+ * Unlike fsnotify_parent(), the event will be reported regardless of the
+ * FS_EVENT_ON_CHILD mask on the parent inode and will not be reported if only
+ * the child is interested and not the parent.
+ */
+static inline void fsnotify_name(struct inode *dir, __u32 mask,
+ struct inode *child,
+ const struct qstr *name, u32 cookie)
{
- if (!dentry)
- dentry = path->dentry;
-
- return __fsnotify_parent(path, dentry, mask);
+ fsnotify(mask, child, FSNOTIFY_EVENT_INODE, dir, name, NULL, cookie);
}
-/* simple call site for access decisions */
-static inline int fsnotify_perm(struct file *file, int mask)
+static inline void fsnotify_dirent(struct inode *dir, struct dentry *dentry,
+ __u32 mask)
+{
+ fsnotify_name(dir, mask, d_inode(dentry), &dentry->d_name, 0);
+}
+
+static inline void fsnotify_inode(struct inode *inode, __u32 mask)
+{
+ if (S_ISDIR(inode->i_mode))
+ mask |= FS_ISDIR;
+
+ fsnotify(mask, inode, FSNOTIFY_EVENT_INODE, NULL, NULL, inode, 0);
+}
+
+/* Notify this dentry's parent about a child's events. */
+static inline int fsnotify_parent(struct dentry *dentry, __u32 mask,
+ const void *data, int data_type)
+{
+ struct inode *inode = d_inode(dentry);
+
+ if (S_ISDIR(inode->i_mode)) {
+ mask |= FS_ISDIR;
+
+ /* sb/mount marks are not interested in name of directory */
+ if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED))
+ goto notify_child;
+ }
+
+ /* disconnected dentry cannot notify parent */
+ if (IS_ROOT(dentry))
+ goto notify_child;
+
+ return __fsnotify_parent(dentry, mask, data, data_type);
+
+notify_child:
+ return fsnotify(mask, data, data_type, NULL, NULL, inode, 0);
+}
+
+/*
+ * Simple wrappers to consolidate calls to fsnotify_parent() when an event
+ * is on a file/dentry.
+ */
+static inline void fsnotify_dentry(struct dentry *dentry, __u32 mask)
+{
+ fsnotify_parent(dentry, mask, d_inode(dentry), FSNOTIFY_EVENT_INODE);
+}
+
+static inline int fsnotify_file(struct file *file, __u32 mask)
{
const struct path *path = &file->f_path;
- struct inode *inode = file_inode(file);
- __u32 fsnotify_mask = 0;
- int ret;
if (file->f_mode & FMODE_NONOTIFY)
return 0;
+
+ return fsnotify_parent(path->dentry, mask, path, FSNOTIFY_EVENT_PATH);
+}
+
+/* Simple call site for access decisions */
+static inline int fsnotify_perm(struct file *file, int mask)
+{
+ int ret;
+ __u32 fsnotify_mask = 0;
+
if (!(mask & (MAY_READ | MAY_OPEN)))
return 0;
- if (mask & MAY_OPEN)
+
+ if (mask & MAY_OPEN) {
fsnotify_mask = FS_OPEN_PERM;
- else if (mask & MAY_READ)
+
+ if (file->f_flags & __FMODE_EXEC) {
+ ret = fsnotify_file(file, FS_OPEN_EXEC_PERM);
+
+ if (ret)
+ return ret;
+ }
+ } else if (mask & MAY_READ) {
fsnotify_mask = FS_ACCESS_PERM;
- else
- BUG();
+ }
- ret = fsnotify_parent(path, NULL, fsnotify_mask);
- if (ret)
- return ret;
-
- return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ return fsnotify_file(file, fsnotify_mask);
}
/*
@@ -57,21 +120,22 @@
*/
static inline void fsnotify_link_count(struct inode *inode)
{
- fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+ fsnotify_inode(inode, FS_ATTRIB);
}
/*
* fsnotify_move - file old_name at old_dir was moved to new_name at new_dir
*/
static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
- const unsigned char *old_name,
- int isdir, struct inode *target, struct dentry *moved)
+ const struct qstr *old_name,
+ int isdir, struct inode *target,
+ struct dentry *moved)
{
struct inode *source = moved->d_inode;
u32 fs_cookie = fsnotify_get_cookie();
- __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM);
- __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO);
- const unsigned char *new_name = moved->d_name.name;
+ __u32 old_dir_mask = FS_MOVED_FROM;
+ __u32 new_dir_mask = FS_MOVED_TO;
+ const struct qstr *new_name = &moved->d_name;
if (old_dir == new_dir)
old_dir_mask |= FS_DN_RENAME;
@@ -81,16 +145,12 @@
new_dir_mask |= FS_ISDIR;
}
- fsnotify(old_dir, old_dir_mask, source, FSNOTIFY_EVENT_INODE, old_name,
- fs_cookie);
- fsnotify(new_dir, new_dir_mask, source, FSNOTIFY_EVENT_INODE, new_name,
- fs_cookie);
+ fsnotify_name(old_dir, old_dir_mask, source, old_name, fs_cookie);
+ fsnotify_name(new_dir, new_dir_mask, source, new_name, fs_cookie);
if (target)
fsnotify_link_count(target);
-
- if (source)
- fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+ fsnotify_inode(source, FS_MOVE_SELF);
audit_inode_child(new_dir, moved, AUDIT_TYPE_CHILD_CREATE);
}
@@ -111,24 +171,11 @@
}
/*
- * fsnotify_nameremove - a filename was removed from a directory
- */
-static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
-{
- __u32 mask = FS_DELETE;
-
- if (isdir)
- mask |= FS_ISDIR;
-
- fsnotify_parent(NULL, dentry, mask);
-}
-
-/*
* fsnotify_inoderemove - an inode is going away
*/
static inline void fsnotify_inoderemove(struct inode *inode)
{
- fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+ fsnotify_inode(inode, FS_DELETE_SELF);
__fsnotify_inode_delete(inode);
}
@@ -139,7 +186,7 @@
{
audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
- fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
+ fsnotify_dirent(inode, dentry, FS_CREATE);
}
/*
@@ -147,12 +194,62 @@
* Note: We have to pass also the linked inode ptr as some filesystems leave
* new_dentry->d_inode NULL and instantiate inode pointer later
*/
-static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry)
+static inline void fsnotify_link(struct inode *dir, struct inode *inode,
+ struct dentry *new_dentry)
{
fsnotify_link_count(inode);
audit_inode_child(dir, new_dentry, AUDIT_TYPE_CHILD_CREATE);
- fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0);
+ fsnotify_name(dir, FS_CREATE, inode, &new_dentry->d_name, 0);
+}
+
+/*
+ * fsnotify_delete - @dentry was unlinked and unhashed
+ *
+ * Caller must make sure that dentry->d_name is stable.
+ *
+ * Note: unlike fsnotify_unlink(), we have to pass also the unlinked inode
+ * as this may be called after d_delete() and old_dentry may be negative.
+ */
+static inline void fsnotify_delete(struct inode *dir, struct inode *inode,
+ struct dentry *dentry)
+{
+ __u32 mask = FS_DELETE;
+
+ if (S_ISDIR(inode->i_mode))
+ mask |= FS_ISDIR;
+
+ fsnotify_name(dir, mask, inode, &dentry->d_name, 0);
+}
+
+/**
+ * d_delete_notify - delete a dentry and call fsnotify_delete()
+ * @dentry: The dentry to delete
+ *
+ * This helper is used to guaranty that the unlinked inode cannot be found
+ * by lookup of this name after fsnotify_delete() event has been delivered.
+ */
+static inline void d_delete_notify(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = d_inode(dentry);
+
+ ihold(inode);
+ d_delete(dentry);
+ fsnotify_delete(dir, inode, dentry);
+ iput(inode);
+}
+
+/*
+ * fsnotify_unlink - 'name' was unlinked
+ *
+ * Caller must make sure that dentry->d_name is stable.
+ */
+static inline void fsnotify_unlink(struct inode *dir, struct dentry *dentry)
+{
+ if (WARN_ON_ONCE(d_is_negative(dentry)))
+ return;
+
+ fsnotify_delete(dir, d_inode(dentry), dentry);
}
/*
@@ -160,12 +257,22 @@
*/
static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
{
- __u32 mask = (FS_CREATE | FS_ISDIR);
- struct inode *d_inode = dentry->d_inode;
-
audit_inode_child(inode, dentry, AUDIT_TYPE_CHILD_CREATE);
- fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0);
+ fsnotify_dirent(inode, dentry, FS_CREATE | FS_ISDIR);
+}
+
+/*
+ * fsnotify_rmdir - directory 'name' was removed
+ *
+ * Caller must make sure that dentry->d_name is stable.
+ */
+static inline void fsnotify_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ if (WARN_ON_ONCE(d_is_negative(dentry)))
+ return;
+
+ fsnotify_delete(dir, d_inode(dentry), dentry);
}
/*
@@ -173,17 +280,7 @@
*/
static inline void fsnotify_access(struct file *file)
{
- const struct path *path = &file->f_path;
- struct inode *inode = file_inode(file);
- __u32 mask = FS_ACCESS;
-
- if (S_ISDIR(inode->i_mode))
- mask |= FS_ISDIR;
-
- if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
- }
+ fsnotify_file(file, FS_ACCESS);
}
/*
@@ -191,17 +288,7 @@
*/
static inline void fsnotify_modify(struct file *file)
{
- const struct path *path = &file->f_path;
- struct inode *inode = file_inode(file);
- __u32 mask = FS_MODIFY;
-
- if (S_ISDIR(inode->i_mode))
- mask |= FS_ISDIR;
-
- if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
- }
+ fsnotify_file(file, FS_MODIFY);
}
/*
@@ -209,24 +296,12 @@
*/
static inline void fsnotify_open(struct file *file)
{
- const struct path *path = &file->f_path;
- struct inode *inode = file_inode(file);
- struct path lower_path;
__u32 mask = FS_OPEN;
- if (S_ISDIR(inode->i_mode))
- mask |= FS_ISDIR;
+ if (file->f_flags & __FMODE_EXEC)
+ mask |= FS_OPEN_EXEC;
- if (path->dentry->d_op && path->dentry->d_op->d_canonical_path) {
- path->dentry->d_op->d_canonical_path(path, &lower_path);
- fsnotify_parent(&lower_path, NULL, mask);
- fsnotify(lower_path.dentry->d_inode, mask, &lower_path,
- FSNOTIFY_EVENT_PATH, NULL, 0);
- path_put(&lower_path);
- }
-
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ fsnotify_file(file, mask);
}
/*
@@ -234,18 +309,10 @@
*/
static inline void fsnotify_close(struct file *file)
{
- const struct path *path = &file->f_path;
- struct inode *inode = file_inode(file);
- fmode_t mode = file->f_mode;
- __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
+ __u32 mask = (file->f_mode & FMODE_WRITE) ? FS_CLOSE_WRITE :
+ FS_CLOSE_NOWRITE;
- if (S_ISDIR(inode->i_mode))
- mask |= FS_ISDIR;
-
- if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
- }
+ fsnotify_file(file, mask);
}
/*
@@ -253,14 +320,7 @@
*/
static inline void fsnotify_xattr(struct dentry *dentry)
{
- struct inode *inode = dentry->d_inode;
- __u32 mask = FS_ATTRIB;
-
- if (S_ISDIR(inode->i_mode))
- mask |= FS_ISDIR;
-
- fsnotify_parent(NULL, dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+ fsnotify_dentry(dentry, FS_ATTRIB);
}
/*
@@ -269,7 +329,6 @@
*/
static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
{
- struct inode *inode = dentry->d_inode;
__u32 mask = 0;
if (ia_valid & ATTR_UID)
@@ -290,13 +349,8 @@
if (ia_valid & ATTR_MODE)
mask |= FS_ATTRIB;
- if (mask) {
- if (S_ISDIR(inode->i_mode))
- mask |= FS_ISDIR;
-
- fsnotify_parent(NULL, dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
- }
+ if (mask)
+ fsnotify_dentry(dentry, mask);
}
#endif /* _LINUX_FS_NOTIFY_H */
--
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