Merge tag 'vfs-6.14-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "Features:

   - Support caching symlink lengths in inodes

     The size is stored in a new union utilizing the same space as
     i_devices, thus avoiding growing the struct or taking up any more
     space

     When utilized it dodges strlen() in vfs_readlink(), giving about
     1.5% speed up when issuing readlink on /initrd.img on ext4

   - Add RWF_DONTCACHE iocb and FOP_DONTCACHE file_operations flag

     If a file system supports uncached buffered IO, it may set
     FOP_DONTCACHE and enable support for RWF_DONTCACHE.

     If RWF_DONTCACHE is attempted without the file system supporting
     it, it'll get errored with -EOPNOTSUPP

   - Enable VBOXGUEST and VBOXSF_FS on ARM64

     Now that VirtualBox is able to run as a host on arm64 (e.g. the
     Apple M3 processors) we can enable VBOXSF_FS (and in turn
     VBOXGUEST) for this architecture.

     Tested with various runs of bonnie++ and dbench on an Apple MacBook
     Pro with the latest Virtualbox 7.1.4 r165100 installed

  Cleanups:

   - Delay sysctl_nr_open check in expand_files()

   - Use kernel-doc includes in fiemap docbook

   - Use page->private instead of page->index in watch_queue

   - Use a consume fence in mnt_idmap() as it's heavily used in
     link_path_walk()

   - Replace magic number 7 with ARRAY_SIZE() in fc_log

   - Sort out a stale comment about races between fd alloc and dup2()

   - Fix return type of do_mount() from long to int

   - Various cosmetic cleanups for the lockref code

  Fixes:

   - Annotate spinning as unlikely() in __read_seqcount_begin

     The annotation already used to be there, but got lost in commit
     52ac39e5db51 ("seqlock: seqcount_t: Implement all read APIs as
     statement expressions")

   - Fix proc_handler for sysctl_nr_open

   - Flush delayed work in delayed fput()

   - Fix grammar and spelling in propagate_umount()

   - Fix ESP not readable during coredump

     In /proc/PID/stat, there is the kstkesp field which is the stack
     pointer of a thread. While the thread is active, this field reads
     zero. But during a coredump, it should have a valid value

     However, at the moment, kstkesp is zero even during coredump

   - Don't wake up the writer if the pipe is still full

   - Fix unbalanced user_access_end() in select code"

* tag 'vfs-6.14-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (28 commits)
  gfs2: use lockref_init for qd_lockref
  erofs: use lockref_init for pcl->lockref
  dcache: use lockref_init for d_lockref
  lockref: add a lockref_init helper
  lockref: drop superfluous externs
  lockref: use bool for false/true returns
  lockref: improve the lockref_get_not_zero description
  lockref: remove lockref_put_not_zero
  fs: Fix return type of do_mount() from long to int
  select: Fix unbalanced user_access_end()
  vbox: Enable VBOXGUEST and VBOXSF_FS on ARM64
  pipe_read: don't wake up the writer if the pipe is still full
  selftests: coredump: Add stackdump test
  fs/proc: do_task_stat: Fix ESP not readable during coredump
  fs: add RWF_DONTCACHE iocb and FOP_DONTCACHE file_operations flag
  fs: sort out a stale comment about races between fd alloc and dup2
  fs: Fix grammar and spelling in propagate_umount()
  fs: fc_log replace magic number 7 with ARRAY_SIZE()
  fs: use a consume fence in mnt_idmap()
  file: flush delayed work in delayed fput()
  ...

1 files changed, 15 insertions, 45 deletions

diff --git a/lib/lockref.c b/lib/lockref.c
index 2afe4c5d8919..5d8e3ef3860e 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -58,23 +58,22 @@ EXPORT_SYMBOL(lockref_get);
  * @lockref: pointer to lockref structure
  * Return: 1 if count updated successfully or 0 if count was zero
  */
-int lockref_get_not_zero(struct lockref *lockref)
+bool lockref_get_not_zero(struct lockref *lockref)
 {
-	int retval;
+	bool retval = false;
 
 	CMPXCHG_LOOP(
 		new.count++;
 		if (old.count <= 0)
-			return 0;
+			return false;
 	,
-		return 1;
+		return true;
 	);
 
 	spin_lock(&lockref->lock);
-	retval = 0;
 	if (lockref->count > 0) {
 		lockref->count++;
-		retval = 1;
+		retval = true;
 	}
 	spin_unlock(&lockref->lock);
 	return retval;
@@ -82,39 +81,11 @@ int lockref_get_not_zero(struct lockref *lockref)
 EXPORT_SYMBOL(lockref_get_not_zero);
 
 /**
- * lockref_put_not_zero - Decrements count unless count <= 1 before decrement
- * @lockref: pointer to lockref structure
- * Return: 1 if count updated successfully or 0 if count would become zero
- */
-int lockref_put_not_zero(struct lockref *lockref)
-{
-	int retval;
-
-	CMPXCHG_LOOP(
-		new.count--;
-		if (old.count <= 1)
-			return 0;
-	,
-		return 1;
-	);
-
-	spin_lock(&lockref->lock);
-	retval = 0;
-	if (lockref->count > 1) {
-		lockref->count--;
-		retval = 1;
-	}
-	spin_unlock(&lockref->lock);
-	return retval;
-}
-EXPORT_SYMBOL(lockref_put_not_zero);
-
-/**
  * lockref_put_return - Decrement reference count if possible
  * @lockref: pointer to lockref structure
  *
  * Decrement the reference count and return the new value.
- * If the lockref was dead or locked, return an error.
+ * If the lockref was dead or locked, return -1.
  */
 int lockref_put_return(struct lockref *lockref)
 {
@@ -134,22 +105,22 @@ EXPORT_SYMBOL(lockref_put_return);
  * @lockref: pointer to lockref structure
  * Return: 1 if count updated successfully or 0 if count <= 1 and lock taken
  */
-int lockref_put_or_lock(struct lockref *lockref)
+bool lockref_put_or_lock(struct lockref *lockref)
 {
 	CMPXCHG_LOOP(
 		new.count--;
 		if (old.count <= 1)
 			break;
 	,
-		return 1;
+		return true;
 	);
 
 	spin_lock(&lockref->lock);
 	if (lockref->count <= 1)
-		return 0;
+		return false;
 	lockref->count--;
 	spin_unlock(&lockref->lock);
-	return 1;
+	return true;
 }
 EXPORT_SYMBOL(lockref_put_or_lock);
 
@@ -169,23 +140,22 @@ EXPORT_SYMBOL(lockref_mark_dead);
  * @lockref: pointer to lockref structure
  * Return: 1 if count updated successfully or 0 if lockref was dead
  */
-int lockref_get_not_dead(struct lockref *lockref)
+bool lockref_get_not_dead(struct lockref *lockref)
 {
-	int retval;
+	bool retval = false;
 
 	CMPXCHG_LOOP(
 		new.count++;
 		if (old.count < 0)
-			return 0;
+			return false;
 	,
-		return 1;
+		return true;
 	);
 
 	spin_lock(&lockref->lock);
-	retval = 0;
 	if (lockref->count >= 0) {
 		lockref->count++;
-		retval = 1;
+		retval = true;
 	}
 	spin_unlock(&lockref->lock);
 	return retval;