Adding eventfs_remove(), this function will recursively remove dir or file info from eventfs. Signed-off-by: Ajay Kaher <akaher@xxxxxxxxxx> Co-developed-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> Tested-by: Ching-lin Yu <chinglinyu@xxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Link: https://lore.kernel.org/oe-kbuild-all/202305030611.Kas747Ev-lkp@xxxxxxxxx/ --- fs/tracefs/event_inode.c | 78 ++++++++++++++++++++++++++++++++++++++++ include/linux/tracefs.h | 4 +++ 2 files changed, 82 insertions(+) diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c index 17afb7476..874ef88bd 100644 --- a/fs/tracefs/event_inode.c +++ b/fs/tracefs/event_inode.c @@ -364,3 +364,81 @@ int eventfs_add_file(const char *name, umode_t mode, eventfs_up_write(eventfs_rwsem); return 0; } + +/** + * eventfs_remove_rec - remove eventfs dir or file from list + * @ef: a pointer to eventfs_file to be removed. + * + * This function recursively remove eventfs_file which + * contains info of file or dir. + */ +static void eventfs_remove_rec(struct eventfs_file *ef) +{ + struct eventfs_file *ef_child, *n; + + if (!ef) + return; + + if (ef->ei) { + /* search for nested folders or files */ + list_for_each_entry_safe(ef_child, n, &ef->ei->e_top_files, list) { + eventfs_remove_rec(ef_child); + } + kfree(ef->ei); + } + + if (ef->created && ef->dentry) { + d_invalidate(ef->dentry); + dput(ef->dentry); + } + list_del(&ef->list); + kfree(ef->name); + kfree(ef); +} + +/** + * eventfs_remove - remove eventfs dir or file from list + * @ef: a pointer to eventfs_file to be removed. + * + * This function acquire the eventfs_rwsem lock and call eventfs_remove_rec() + */ +void eventfs_remove(struct eventfs_file *ef) +{ + struct rw_semaphore *eventfs_rwsem; + + if (!ef) + return; + + if (ef->ei) + eventfs_rwsem = (struct rw_semaphore *) ef->data; + else + eventfs_rwsem = (struct rw_semaphore *) ef->d_parent->d_inode->i_private; + + eventfs_down_write(eventfs_rwsem); + eventfs_remove_rec(ef); + eventfs_up_write(eventfs_rwsem); +} + +/** + * eventfs_remove_events_dir - remove eventfs dir or file from list + * @dentry: a pointer to events's dentry to be removed. + * + * This function remove events main directory + */ +void eventfs_remove_events_dir(struct dentry *dentry) +{ + struct tracefs_inode *ti; + struct eventfs_inode *ei; + + if (!dentry || !dentry->d_inode) + return; + + ti = get_tracefs(dentry->d_inode); + if (!ti || !(ti->flags & TRACEFS_EVENT_INODE)) + return; + + ei = ti->private; + d_invalidate(dentry); + dput(dentry); + kfree(ei); +} diff --git a/include/linux/tracefs.h b/include/linux/tracefs.h index 1e1780a61..ea10ccc87 100644 --- a/include/linux/tracefs.h +++ b/include/linux/tracefs.h @@ -58,6 +58,10 @@ int eventfs_add_top_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops); +void eventfs_remove(struct eventfs_file *ef); + +void eventfs_remove_events_dir(struct dentry *dentry); + struct dentry *tracefs_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops); -- 2.40.0
