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Looking at how dentry is removed via the tracefs system, I found that
eventfs does not do everything that it did under tracefs. The tracefs
removal of a dentry calls simple_recursive_removal() that does a lot more
than a simple d_invalidate().
As it should be a requirement that any eventfs_inode that has a dentry, so
does its parent. When removing a eventfs_inode, if it has a dentry, a call
to simple_recursive_removal() on that dentry should clean up all the
dentries underneath it.
Add WARN_ON_ONCE() to check for the parent having a dentry if any children
do.
Link: https://lore.kernel.org/all/20231101022553.GE1957730@ZenIV/
Link: https://lkml.kernel.org/r/20231101172650.552471568@goodmis.org
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Fixes: 5bdcd5f533 ("eventfs: Implement removal of meta data from eventfs")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TRACEFS_INTERNAL_H
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#define _TRACEFS_INTERNAL_H
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enum {
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TRACEFS_EVENT_INODE = BIT(1),
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TRACEFS_EVENT_TOP_INODE = BIT(2),
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};
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struct tracefs_inode {
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unsigned long flags;
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void *private;
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struct inode vfs_inode;
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};
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/*
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* struct eventfs_attr - cache the mode and ownership of a eventfs entry
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* @mode: saved mode plus flags of what is saved
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* @uid: saved uid if changed
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* @gid: saved gid if changed
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*/
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struct eventfs_attr {
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int mode;
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kuid_t uid;
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kgid_t gid;
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};
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/*
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* struct eventfs_inode - hold the properties of the eventfs directories.
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* @list: link list into the parent directory
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* @entries: the array of entries representing the files in the directory
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* @name: the name of the directory to create
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* @children: link list into the child eventfs_inode
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* @dentry: the dentry of the directory
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* @d_parent: pointer to the parent's dentry
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* @d_children: The array of dentries to represent the files when created
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* @entry_attrs: Saved mode and ownership of the @d_children
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* @attr: Saved mode and ownership of eventfs_inode itself
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* @data: The private data to pass to the callbacks
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* @is_freed: Flag set if the eventfs is on its way to be freed
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* Note if is_freed is set, then dentry is corrupted.
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* @nr_entries: The number of items in @entries
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*/
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struct eventfs_inode {
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struct list_head list;
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const struct eventfs_entry *entries;
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const char *name;
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struct list_head children;
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struct dentry *dentry; /* Check is_freed to access */
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struct dentry *d_parent;
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struct dentry **d_children;
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struct eventfs_attr *entry_attrs;
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struct eventfs_attr attr;
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void *data;
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/*
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* Union - used for deletion
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* @llist: for calling dput() if needed after RCU
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* @rcu: eventfs_inode to delete in RCU
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*/
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union {
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struct llist_node llist;
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struct rcu_head rcu;
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};
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unsigned int is_freed:1;
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unsigned int nr_entries:31;
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};
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static inline struct tracefs_inode *get_tracefs(const struct inode *inode)
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{
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return container_of(inode, struct tracefs_inode, vfs_inode);
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}
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struct dentry *tracefs_start_creating(const char *name, struct dentry *parent);
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struct dentry *tracefs_end_creating(struct dentry *dentry);
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struct dentry *tracefs_failed_creating(struct dentry *dentry);
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struct inode *tracefs_get_inode(struct super_block *sb);
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struct dentry *eventfs_start_creating(const char *name, struct dentry *parent);
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struct dentry *eventfs_failed_creating(struct dentry *dentry);
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struct dentry *eventfs_end_creating(struct dentry *dentry);
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void eventfs_set_ei_status_free(struct tracefs_inode *ti, struct dentry *dentry);
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#endif /* _TRACEFS_INTERNAL_H */
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