Linus Torvalds 56897d5188 Tracing and eventfs fixes for v6.8:
- Fix the return code for ring_buffer_poll_wait()
   It was returing a -EINVAL instead of EPOLLERR.
 
 - Zero out the tracefs_inode so that all fields are initialized.
   The ti->private could have had stale data, but instead of
   just initializing it to NULL, clear out the entire structure
   when it is allocated.
 
 - Fix a crash in timerlat
   The hrtimer was initialized at read and not open, but is
   canceled at close. If the file was opened and never read
   the close will pass a NULL pointer to hrtime_cancel().
 
 - Rewrite of eventfs.
   Linus wrote a patch series to remove the dentry references in the
   eventfs_inode and to use ref counting and more of proper VFS
   interfaces to make it work.
 
 - Add warning to put_ei() if ei is not set to free. That means
   something is about to free it when it shouldn't.
 
 - Restructure the eventfs_inode to make it more compact, and remove
   the unused llist field.
 
 - Remove the fsnotify*() funtions for when the inodes were being created
   in the lookup code. It doesn't make sense to notify about creation
   just because something is being looked up.
 
 - The inode hard link count was not accurate. It was being updated
   when a file was looked up. The inodes of directories were updating
   their parent inode hard link count every time the inode was created.
   That means if memory reclaim cleaned a stale directory inode and
   the inode was lookup up again, it would increment the parent inode
   again as well. Al Viro said to just have all eventfs directories
   have a hard link count of 1. That tells user space not to trust it.
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Merge tag 'trace-v6.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing and eventfs fixes from Steven Rostedt:

 - Fix the return code for ring_buffer_poll_wait()

   It was returing a -EINVAL instead of EPOLLERR.

 - Zero out the tracefs_inode so that all fields are initialized.

   The ti->private could have had stale data, but instead of just
   initializing it to NULL, clear out the entire structure when it is
   allocated.

 - Fix a crash in timerlat

   The hrtimer was initialized at read and not open, but is canceled at
   close. If the file was opened and never read the close will pass a
   NULL pointer to hrtime_cancel().

 - Rewrite of eventfs.

   Linus wrote a patch series to remove the dentry references in the
   eventfs_inode and to use ref counting and more of proper VFS
   interfaces to make it work.

 - Add warning to put_ei() if ei is not set to free. That means
   something is about to free it when it shouldn't.

 - Restructure the eventfs_inode to make it more compact, and remove the
   unused llist field.

 - Remove the fsnotify*() funtions for when the inodes were being
   created in the lookup code. It doesn't make sense to notify about
   creation just because something is being looked up.

 - The inode hard link count was not accurate.

   It was being updated when a file was looked up. The inodes of
   directories were updating their parent inode hard link count every
   time the inode was created. That means if memory reclaim cleaned a
   stale directory inode and the inode was lookup up again, it would
   increment the parent inode again as well. Al Viro said to just have
   all eventfs directories have a hard link count of 1. That tells user
   space not to trust it.

* tag 'trace-v6.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  eventfs: Keep all directory links at 1
  eventfs: Remove fsnotify*() functions from lookup()
  eventfs: Restructure eventfs_inode structure to be more condensed
  eventfs: Warn if an eventfs_inode is freed without is_freed being set
  tracing/timerlat: Move hrtimer_init to timerlat_fd open()
  eventfs: Get rid of dentry pointers without refcounts
  eventfs: Clean up dentry ops and add revalidate function
  eventfs: Remove unused d_parent pointer field
  tracefs: dentry lookup crapectomy
  tracefs: Avoid using the ei->dentry pointer unnecessarily
  eventfs: Initialize the tracefs inode properly
  tracefs: Zero out the tracefs_inode when allocating it
  ring-buffer: Clean ring_buffer_poll_wait() error return
2024-02-02 15:32:58 -08:00
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