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eventfs: Implement eventfs file add functions

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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 <akaher@vmware.com>
Co-developed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Tested-by: Ching-lin Yu <chinglinyu@google.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202305051619.9a469a9a-yujie.liu@intel.com
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Ajay Kaher 2023-07-28 23:50:47 +05:30 committed by Steven Rostedt (Google)
parent c1504e5102
commit 88f349b4a8
2 changed files with 94 additions and 0 deletions
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86
fs/tracefs/event_inode.c
View File

@ -209,3 +209,89 @@ struct eventfs_file *eventfs_add_dir(const char *name,
mutex_unlock(&eventfs_mutex);
return ef;
}
/**
* eventfs_add_events_file - add the data needed to create a file for later reference
* @name: the name of the file to create.
* @mode: the permission that the file should have.
* @parent: parent dentry for this file.
* @data: something that the caller will want to get to later on.
* @fop: struct file_operations that should be used for this file.
*
* This function is used to add the information needed to create a
* dentry/inode within the top level events directory. The file created
* will have the @mode permissions. The @data will be used to fill the
* inode.i_private when the open() call is done. The dentry and inodes are
* all created when they are referenced, and removed when they are no
* longer referenced.
*/
int eventfs_add_events_file(const char *name, umode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fop)
{
struct tracefs_inode *ti;
struct eventfs_inode *ei;
struct eventfs_file *ef;
if (!parent)
return -EINVAL;
if (!(mode & S_IFMT))
mode |= S_IFREG;
if (!parent->d_inode)
return -EINVAL;
ti = get_tracefs(parent->d_inode);
if (!(ti->flags & TRACEFS_EVENT_INODE))
return -EINVAL;
ei = ti->private;
ef = eventfs_prepare_ef(name, mode, fop, NULL, data);
if (IS_ERR(ef))
return -ENOMEM;
mutex_lock(&eventfs_mutex);
list_add_tail(&ef->list, &ei->e_top_files);
mutex_unlock(&eventfs_mutex);
return 0;
}
/**
* eventfs_add_file - add eventfs file to list to create later
* @name: the name of the file to create.
* @mode: the permission that the file should have.
* @ef_parent: parent eventfs_file for this file.
* @data: something that the caller will want to get to later on.
* @fop: struct file_operations that should be used for this file.
*
* This function is used to add the information needed to create a
* file within a subdirectory of the events directory. The file created
* will have the @mode permissions. The @data will be used to fill the
* inode.i_private when the open() call is done. The dentry and inodes are
* all created when they are referenced, and removed when they are no
* longer referenced.
*/
int eventfs_add_file(const char *name, umode_t mode,
struct eventfs_file *ef_parent,
void *data,
const struct file_operations *fop)
{
struct eventfs_file *ef;
if (!ef_parent)
return -EINVAL;
if (!(mode & S_IFMT))
mode |= S_IFREG;
ef = eventfs_prepare_ef(name, mode, fop, NULL, data);
if (IS_ERR(ef))
return -ENOMEM;
mutex_lock(&eventfs_mutex);
list_add_tail(&ef->list, &ef_parent->ei->e_top_files);
mutex_unlock(&eventfs_mutex);
return 0;
}

8
include/linux/tracefs.h
View File

@ -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);