From c1504e5102384762bd06b068e9928b624a8a88c6 Mon Sep 17 00:00:00 2001 From: Ajay Kaher Date: Fri, 28 Jul 2023 23:50:46 +0530 Subject: eventfs: Implement eventfs dir creation functions Add eventfs_file structure which will hold the properties of the eventfs files and directories. Add following functions to create the directories in eventfs: eventfs_create_events_dir() will create the top level "events" directory within the tracefs file system. eventfs_add_subsystem_dir() creates an eventfs_file descriptor with the given name of the subsystem. eventfs_add_dir() creates an eventfs_file descriptor with the given name of the directory and attached to a eventfs_file of a subsystem. Add tracefs_inode structure to hold the inodes, flags and pointers to private data used by eventfs. Link: https://lkml.kernel.org/r/1690568452-46553-5-git-send-email-akaher@vmware.com Signed-off-by: Ajay Kaher Co-developed-by: Steven Rostedt (VMware) Signed-off-by: Steven Rostedt (VMware) Tested-by: Ching-lin Yu Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202305051619.9a469a9a-yujie.liu@intel.com Signed-off-by: Steven Rostedt (Google) --- include/linux/tracefs.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/linux/tracefs.h') diff --git a/include/linux/tracefs.h b/include/linux/tracefs.h index 99912445974c..432e5e6f7901 100644 --- a/include/linux/tracefs.h +++ b/include/linux/tracefs.h @@ -21,6 +21,17 @@ struct file_operations; #ifdef CONFIG_TRACING +struct eventfs_file; + +struct dentry *eventfs_create_events_dir(const char *name, + struct dentry *parent); + +struct eventfs_file *eventfs_add_subsystem_dir(const char *name, + struct dentry *parent); + +struct eventfs_file *eventfs_add_dir(const char *name, + struct eventfs_file *ef_parent); + struct dentry *tracefs_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops); -- cgit From 88f349b4a83aab6a0fabd4230a1b6796f26bc546 Mon Sep 17 00:00:00 2001 From: Ajay Kaher Date: Fri, 28 Jul 2023 23:50:47 +0530 Subject: eventfs: Implement eventfs file add functions Add the following functions to add files to evenfs: eventfs_add_events_file() to add the data needed to create a specific file located at the top level events directory. The dentry/inode will be created when the events directory is scanned. eventfs_add_file() to add the data needed for files within the directories below the top level events directory. The dentry/inode of the file will be created when the directory that the file is in is scanned. Link: https://lkml.kernel.org/r/1690568452-46553-6-git-send-email-akaher@vmware.com Signed-off-by: Ajay Kaher Co-developed-by: Steven Rostedt (VMware) Signed-off-by: Steven Rostedt (VMware) Tested-by: Ching-lin Yu Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202305051619.9a469a9a-yujie.liu@intel.com Signed-off-by: Steven Rostedt (Google) --- include/linux/tracefs.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/linux/tracefs.h') diff --git a/include/linux/tracefs.h b/include/linux/tracefs.h index 432e5e6f7901..54c9cbd0389b 100644 --- a/include/linux/tracefs.h +++ b/include/linux/tracefs.h @@ -32,6 +32,14 @@ struct eventfs_file *eventfs_add_subsystem_dir(const char *name, struct eventfs_file *eventfs_add_dir(const char *name, struct eventfs_file *ef_parent); +int eventfs_add_file(const char *name, umode_t mode, + struct eventfs_file *ef_parent, void *data, + const struct file_operations *fops); + +int eventfs_add_events_file(const char *name, umode_t mode, + struct dentry *parent, void *data, + const struct file_operations *fops); + struct dentry *tracefs_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, const struct file_operations *fops); -- cgit From 5bdcd5f5331a276a3ddf1fba8605986d0d15298a Mon Sep 17 00:00:00 2001 From: Ajay Kaher Date: Fri, 28 Jul 2023 23:50:50 +0530 Subject: eventfs: Implement removal of meta data from eventfs When events are removed from tracefs, the eventfs must be aware of this. The eventfs_remove() removes the meta data from eventfs so that it will no longer create the files associated with that event. When an instance is removed from tracefs, eventfs_remove_events_dir() will remove and clean up the entire "events" directory. The helper function eventfs_remove_rec() is used to clean up and free the associated data from eventfs for both of the added functions. SRCU is used to protect the lists of meta data stored in the eventfs. The eventfs_mutex is used to protect the content of the items in the list. As lookups may be happening as deletions of events are made, the freeing of dentry/inodes and relative information is done after the SRCU grace period has passed. Link: https://lkml.kernel.org/r/1690568452-46553-9-git-send-email-akaher@vmware.com Signed-off-by: Ajay Kaher Co-developed-by: Steven Rostedt (VMware) Signed-off-by: Steven Rostedt (VMware) Tested-by: Ching-lin Yu Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202305030611.Kas747Ev-lkp@intel.com/ Signed-off-by: Steven Rostedt (Google) --- include/linux/tracefs.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/tracefs.h') diff --git a/include/linux/tracefs.h b/include/linux/tracefs.h index 54c9cbd0389b..009072792fa3 100644 --- a/include/linux/tracefs.h +++ b/include/linux/tracefs.h @@ -40,6 +40,10 @@ int eventfs_add_events_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); -- cgit